1f48ad614SDennis Dalessandro /* 2f48ad614SDennis Dalessandro * Copyright(c) 2015, 2016 Intel Corporation. 3f48ad614SDennis Dalessandro * 4f48ad614SDennis Dalessandro * This file is provided under a dual BSD/GPLv2 license. When using or 5f48ad614SDennis Dalessandro * redistributing this file, you may do so under either license. 6f48ad614SDennis Dalessandro * 7f48ad614SDennis Dalessandro * GPL LICENSE SUMMARY 8f48ad614SDennis Dalessandro * 9f48ad614SDennis Dalessandro * This program is free software; you can redistribute it and/or modify 10f48ad614SDennis Dalessandro * it under the terms of version 2 of the GNU General Public License as 11f48ad614SDennis Dalessandro * published by the Free Software Foundation. 12f48ad614SDennis Dalessandro * 13f48ad614SDennis Dalessandro * This program is distributed in the hope that it will be useful, but 14f48ad614SDennis Dalessandro * WITHOUT ANY WARRANTY; without even the implied warranty of 15f48ad614SDennis Dalessandro * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16f48ad614SDennis Dalessandro * General Public License for more details. 17f48ad614SDennis Dalessandro * 18f48ad614SDennis Dalessandro * BSD LICENSE 19f48ad614SDennis Dalessandro * 20f48ad614SDennis Dalessandro * Redistribution and use in source and binary forms, with or without 21f48ad614SDennis Dalessandro * modification, are permitted provided that the following conditions 22f48ad614SDennis Dalessandro * are met: 23f48ad614SDennis Dalessandro * 24f48ad614SDennis Dalessandro * - Redistributions of source code must retain the above copyright 25f48ad614SDennis Dalessandro * notice, this list of conditions and the following disclaimer. 26f48ad614SDennis Dalessandro * - Redistributions in binary form must reproduce the above copyright 27f48ad614SDennis Dalessandro * notice, this list of conditions and the following disclaimer in 28f48ad614SDennis Dalessandro * the documentation and/or other materials provided with the 29f48ad614SDennis Dalessandro * distribution. 30f48ad614SDennis Dalessandro * - Neither the name of Intel Corporation nor the names of its 31f48ad614SDennis Dalessandro * contributors may be used to endorse or promote products derived 32f48ad614SDennis Dalessandro * from this software without specific prior written permission. 33f48ad614SDennis Dalessandro * 34f48ad614SDennis Dalessandro * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 35f48ad614SDennis Dalessandro * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 36f48ad614SDennis Dalessandro * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 37f48ad614SDennis Dalessandro * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 38f48ad614SDennis Dalessandro * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 39f48ad614SDennis Dalessandro * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 40f48ad614SDennis Dalessandro * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 41f48ad614SDennis Dalessandro * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 42f48ad614SDennis Dalessandro * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 43f48ad614SDennis Dalessandro * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 44f48ad614SDennis Dalessandro * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 45f48ad614SDennis Dalessandro * 46f48ad614SDennis Dalessandro */ 47f48ad614SDennis Dalessandro 48f48ad614SDennis Dalessandro #include <linux/io.h> 49f48ad614SDennis Dalessandro #include <rdma/rdma_vt.h> 50f48ad614SDennis Dalessandro #include <rdma/rdmavt_qp.h> 51f48ad614SDennis Dalessandro 52f48ad614SDennis Dalessandro #include "hfi.h" 53f48ad614SDennis Dalessandro #include "qp.h" 54f48ad614SDennis Dalessandro #include "verbs_txreq.h" 55f48ad614SDennis Dalessandro #include "trace.h" 56f48ad614SDennis Dalessandro 57f48ad614SDennis Dalessandro /* cut down ridiculously long IB macro names */ 58b374e060SMike Marciniszyn #define OP(x) RC_OP(x) 59f48ad614SDennis Dalessandro 60f48ad614SDennis Dalessandro static u32 restart_sge(struct rvt_sge_state *ss, struct rvt_swqe *wqe, 61f48ad614SDennis Dalessandro u32 psn, u32 pmtu) 62f48ad614SDennis Dalessandro { 63f48ad614SDennis Dalessandro u32 len; 64f48ad614SDennis Dalessandro 65f48ad614SDennis Dalessandro len = delta_psn(psn, wqe->psn) * pmtu; 66f48ad614SDennis Dalessandro ss->sge = wqe->sg_list[0]; 67f48ad614SDennis Dalessandro ss->sg_list = wqe->sg_list + 1; 68f48ad614SDennis Dalessandro ss->num_sge = wqe->wr.num_sge; 69f48ad614SDennis Dalessandro ss->total_len = wqe->length; 70f48ad614SDennis Dalessandro hfi1_skip_sge(ss, len, 0); 71f48ad614SDennis Dalessandro return wqe->length - len; 72f48ad614SDennis Dalessandro } 73f48ad614SDennis Dalessandro 74f48ad614SDennis Dalessandro /** 75f48ad614SDennis Dalessandro * make_rc_ack - construct a response packet (ACK, NAK, or RDMA read) 76f48ad614SDennis Dalessandro * @dev: the device for this QP 77f48ad614SDennis Dalessandro * @qp: a pointer to the QP 78f48ad614SDennis Dalessandro * @ohdr: a pointer to the IB header being constructed 79f48ad614SDennis Dalessandro * @ps: the xmit packet state 80f48ad614SDennis Dalessandro * 81f48ad614SDennis Dalessandro * Return 1 if constructed; otherwise, return 0. 82f48ad614SDennis Dalessandro * Note that we are in the responder's side of the QP context. 83f48ad614SDennis Dalessandro * Note the QP s_lock must be held. 84f48ad614SDennis Dalessandro */ 85f48ad614SDennis Dalessandro static int make_rc_ack(struct hfi1_ibdev *dev, struct rvt_qp *qp, 86261a4351SMike Marciniszyn struct ib_other_headers *ohdr, 87f48ad614SDennis Dalessandro struct hfi1_pkt_state *ps) 88f48ad614SDennis Dalessandro { 89f48ad614SDennis Dalessandro struct rvt_ack_entry *e; 90f48ad614SDennis Dalessandro u32 hwords; 91f48ad614SDennis Dalessandro u32 len; 92f48ad614SDennis Dalessandro u32 bth0; 93f48ad614SDennis Dalessandro u32 bth2; 94f48ad614SDennis Dalessandro int middle = 0; 95f48ad614SDennis Dalessandro u32 pmtu = qp->pmtu; 96f48ad614SDennis Dalessandro struct hfi1_qp_priv *priv = qp->priv; 97f48ad614SDennis Dalessandro 9868e78b3dSMike Marciniszyn lockdep_assert_held(&qp->s_lock); 99f48ad614SDennis Dalessandro /* Don't send an ACK if we aren't supposed to. */ 100f48ad614SDennis Dalessandro if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) 101f48ad614SDennis Dalessandro goto bail; 102f48ad614SDennis Dalessandro 103f48ad614SDennis Dalessandro /* header size in 32-bit words LRH+BTH = (8+12)/4. */ 104f48ad614SDennis Dalessandro hwords = 5; 105f48ad614SDennis Dalessandro 106f48ad614SDennis Dalessandro switch (qp->s_ack_state) { 107f48ad614SDennis Dalessandro case OP(RDMA_READ_RESPONSE_LAST): 108f48ad614SDennis Dalessandro case OP(RDMA_READ_RESPONSE_ONLY): 109f48ad614SDennis Dalessandro e = &qp->s_ack_queue[qp->s_tail_ack_queue]; 110f48ad614SDennis Dalessandro if (e->rdma_sge.mr) { 111f48ad614SDennis Dalessandro rvt_put_mr(e->rdma_sge.mr); 112f48ad614SDennis Dalessandro e->rdma_sge.mr = NULL; 113f48ad614SDennis Dalessandro } 114f48ad614SDennis Dalessandro /* FALLTHROUGH */ 115f48ad614SDennis Dalessandro case OP(ATOMIC_ACKNOWLEDGE): 116f48ad614SDennis Dalessandro /* 117f48ad614SDennis Dalessandro * We can increment the tail pointer now that the last 118f48ad614SDennis Dalessandro * response has been sent instead of only being 119f48ad614SDennis Dalessandro * constructed. 120f48ad614SDennis Dalessandro */ 121f48ad614SDennis Dalessandro if (++qp->s_tail_ack_queue > HFI1_MAX_RDMA_ATOMIC) 122f48ad614SDennis Dalessandro qp->s_tail_ack_queue = 0; 123f48ad614SDennis Dalessandro /* FALLTHROUGH */ 124f48ad614SDennis Dalessandro case OP(SEND_ONLY): 125f48ad614SDennis Dalessandro case OP(ACKNOWLEDGE): 126f48ad614SDennis Dalessandro /* Check for no next entry in the queue. */ 127f48ad614SDennis Dalessandro if (qp->r_head_ack_queue == qp->s_tail_ack_queue) { 128f48ad614SDennis Dalessandro if (qp->s_flags & RVT_S_ACK_PENDING) 129f48ad614SDennis Dalessandro goto normal; 130f48ad614SDennis Dalessandro goto bail; 131f48ad614SDennis Dalessandro } 132f48ad614SDennis Dalessandro 133f48ad614SDennis Dalessandro e = &qp->s_ack_queue[qp->s_tail_ack_queue]; 134f48ad614SDennis Dalessandro if (e->opcode == OP(RDMA_READ_REQUEST)) { 135f48ad614SDennis Dalessandro /* 136f48ad614SDennis Dalessandro * If a RDMA read response is being resent and 137f48ad614SDennis Dalessandro * we haven't seen the duplicate request yet, 138f48ad614SDennis Dalessandro * then stop sending the remaining responses the 139f48ad614SDennis Dalessandro * responder has seen until the requester re-sends it. 140f48ad614SDennis Dalessandro */ 141f48ad614SDennis Dalessandro len = e->rdma_sge.sge_length; 142f48ad614SDennis Dalessandro if (len && !e->rdma_sge.mr) { 143f48ad614SDennis Dalessandro qp->s_tail_ack_queue = qp->r_head_ack_queue; 144f48ad614SDennis Dalessandro goto bail; 145f48ad614SDennis Dalessandro } 146f48ad614SDennis Dalessandro /* Copy SGE state in case we need to resend */ 147f48ad614SDennis Dalessandro ps->s_txreq->mr = e->rdma_sge.mr; 148f48ad614SDennis Dalessandro if (ps->s_txreq->mr) 149f48ad614SDennis Dalessandro rvt_get_mr(ps->s_txreq->mr); 150f48ad614SDennis Dalessandro qp->s_ack_rdma_sge.sge = e->rdma_sge; 151f48ad614SDennis Dalessandro qp->s_ack_rdma_sge.num_sge = 1; 152b777f154SMitko Haralanov ps->s_txreq->ss = &qp->s_ack_rdma_sge; 153f48ad614SDennis Dalessandro if (len > pmtu) { 154f48ad614SDennis Dalessandro len = pmtu; 155f48ad614SDennis Dalessandro qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST); 156f48ad614SDennis Dalessandro } else { 157f48ad614SDennis Dalessandro qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY); 158f48ad614SDennis Dalessandro e->sent = 1; 159f48ad614SDennis Dalessandro } 160696513e8SBrian Welty ohdr->u.aeth = rvt_compute_aeth(qp); 161f48ad614SDennis Dalessandro hwords++; 162f48ad614SDennis Dalessandro qp->s_ack_rdma_psn = e->psn; 163f48ad614SDennis Dalessandro bth2 = mask_psn(qp->s_ack_rdma_psn++); 164f48ad614SDennis Dalessandro } else { 165f48ad614SDennis Dalessandro /* COMPARE_SWAP or FETCH_ADD */ 166b777f154SMitko Haralanov ps->s_txreq->ss = NULL; 167f48ad614SDennis Dalessandro len = 0; 168f48ad614SDennis Dalessandro qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE); 169696513e8SBrian Welty ohdr->u.at.aeth = rvt_compute_aeth(qp); 170261a4351SMike Marciniszyn ib_u64_put(e->atomic_data, &ohdr->u.at.atomic_ack_eth); 171f48ad614SDennis Dalessandro hwords += sizeof(ohdr->u.at) / sizeof(u32); 172f48ad614SDennis Dalessandro bth2 = mask_psn(e->psn); 173f48ad614SDennis Dalessandro e->sent = 1; 174f48ad614SDennis Dalessandro } 175f48ad614SDennis Dalessandro bth0 = qp->s_ack_state << 24; 176f48ad614SDennis Dalessandro break; 177f48ad614SDennis Dalessandro 178f48ad614SDennis Dalessandro case OP(RDMA_READ_RESPONSE_FIRST): 179f48ad614SDennis Dalessandro qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE); 180f48ad614SDennis Dalessandro /* FALLTHROUGH */ 181f48ad614SDennis Dalessandro case OP(RDMA_READ_RESPONSE_MIDDLE): 182b777f154SMitko Haralanov ps->s_txreq->ss = &qp->s_ack_rdma_sge; 183f48ad614SDennis Dalessandro ps->s_txreq->mr = qp->s_ack_rdma_sge.sge.mr; 184f48ad614SDennis Dalessandro if (ps->s_txreq->mr) 185f48ad614SDennis Dalessandro rvt_get_mr(ps->s_txreq->mr); 186f48ad614SDennis Dalessandro len = qp->s_ack_rdma_sge.sge.sge_length; 187f48ad614SDennis Dalessandro if (len > pmtu) { 188f48ad614SDennis Dalessandro len = pmtu; 189f48ad614SDennis Dalessandro middle = HFI1_CAP_IS_KSET(SDMA_AHG); 190f48ad614SDennis Dalessandro } else { 191696513e8SBrian Welty ohdr->u.aeth = rvt_compute_aeth(qp); 192f48ad614SDennis Dalessandro hwords++; 193f48ad614SDennis Dalessandro qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST); 194f48ad614SDennis Dalessandro e = &qp->s_ack_queue[qp->s_tail_ack_queue]; 195f48ad614SDennis Dalessandro e->sent = 1; 196f48ad614SDennis Dalessandro } 197f48ad614SDennis Dalessandro bth0 = qp->s_ack_state << 24; 198f48ad614SDennis Dalessandro bth2 = mask_psn(qp->s_ack_rdma_psn++); 199f48ad614SDennis Dalessandro break; 200f48ad614SDennis Dalessandro 201f48ad614SDennis Dalessandro default: 202f48ad614SDennis Dalessandro normal: 203f48ad614SDennis Dalessandro /* 204f48ad614SDennis Dalessandro * Send a regular ACK. 205f48ad614SDennis Dalessandro * Set the s_ack_state so we wait until after sending 206f48ad614SDennis Dalessandro * the ACK before setting s_ack_state to ACKNOWLEDGE 207f48ad614SDennis Dalessandro * (see above). 208f48ad614SDennis Dalessandro */ 209f48ad614SDennis Dalessandro qp->s_ack_state = OP(SEND_ONLY); 210f48ad614SDennis Dalessandro qp->s_flags &= ~RVT_S_ACK_PENDING; 211b777f154SMitko Haralanov ps->s_txreq->ss = NULL; 212f48ad614SDennis Dalessandro if (qp->s_nak_state) 213f48ad614SDennis Dalessandro ohdr->u.aeth = 214696513e8SBrian Welty cpu_to_be32((qp->r_msn & RVT_MSN_MASK) | 215f48ad614SDennis Dalessandro (qp->s_nak_state << 216696513e8SBrian Welty RVT_AETH_CREDIT_SHIFT)); 217f48ad614SDennis Dalessandro else 218696513e8SBrian Welty ohdr->u.aeth = rvt_compute_aeth(qp); 219f48ad614SDennis Dalessandro hwords++; 220f48ad614SDennis Dalessandro len = 0; 221f48ad614SDennis Dalessandro bth0 = OP(ACKNOWLEDGE) << 24; 222f48ad614SDennis Dalessandro bth2 = mask_psn(qp->s_ack_psn); 223f48ad614SDennis Dalessandro } 224f48ad614SDennis Dalessandro qp->s_rdma_ack_cnt++; 225f48ad614SDennis Dalessandro qp->s_hdrwords = hwords; 226f48ad614SDennis Dalessandro ps->s_txreq->sde = priv->s_sde; 227e922ae06SDon Hiatt ps->s_txreq->s_cur_size = len; 228f48ad614SDennis Dalessandro hfi1_make_ruc_header(qp, ohdr, bth0, bth2, middle, ps); 229f48ad614SDennis Dalessandro /* pbc */ 230f48ad614SDennis Dalessandro ps->s_txreq->hdr_dwords = qp->s_hdrwords + 2; 231f48ad614SDennis Dalessandro return 1; 232f48ad614SDennis Dalessandro 233f48ad614SDennis Dalessandro bail: 234f48ad614SDennis Dalessandro qp->s_ack_state = OP(ACKNOWLEDGE); 235f48ad614SDennis Dalessandro /* 236f48ad614SDennis Dalessandro * Ensure s_rdma_ack_cnt changes are committed prior to resetting 237f48ad614SDennis Dalessandro * RVT_S_RESP_PENDING 238f48ad614SDennis Dalessandro */ 239f48ad614SDennis Dalessandro smp_wmb(); 240f48ad614SDennis Dalessandro qp->s_flags &= ~(RVT_S_RESP_PENDING 241f48ad614SDennis Dalessandro | RVT_S_ACK_PENDING 242f48ad614SDennis Dalessandro | RVT_S_AHG_VALID); 243f48ad614SDennis Dalessandro return 0; 244f48ad614SDennis Dalessandro } 245f48ad614SDennis Dalessandro 246f48ad614SDennis Dalessandro /** 247f48ad614SDennis Dalessandro * hfi1_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC) 248f48ad614SDennis Dalessandro * @qp: a pointer to the QP 249f48ad614SDennis Dalessandro * 250f48ad614SDennis Dalessandro * Assumes s_lock is held. 251f48ad614SDennis Dalessandro * 252f48ad614SDennis Dalessandro * Return 1 if constructed; otherwise, return 0. 253f48ad614SDennis Dalessandro */ 254f48ad614SDennis Dalessandro int hfi1_make_rc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps) 255f48ad614SDennis Dalessandro { 256f48ad614SDennis Dalessandro struct hfi1_qp_priv *priv = qp->priv; 257f48ad614SDennis Dalessandro struct hfi1_ibdev *dev = to_idev(qp->ibqp.device); 258261a4351SMike Marciniszyn struct ib_other_headers *ohdr; 259f48ad614SDennis Dalessandro struct rvt_sge_state *ss; 260f48ad614SDennis Dalessandro struct rvt_swqe *wqe; 261f48ad614SDennis Dalessandro /* header size in 32-bit words LRH+BTH = (8+12)/4. */ 262f48ad614SDennis Dalessandro u32 hwords = 5; 263f48ad614SDennis Dalessandro u32 len; 264f48ad614SDennis Dalessandro u32 bth0 = 0; 265f48ad614SDennis Dalessandro u32 bth2; 266f48ad614SDennis Dalessandro u32 pmtu = qp->pmtu; 267f48ad614SDennis Dalessandro char newreq; 268f48ad614SDennis Dalessandro int middle = 0; 269f48ad614SDennis Dalessandro int delta; 270f48ad614SDennis Dalessandro 27168e78b3dSMike Marciniszyn lockdep_assert_held(&qp->s_lock); 272f48ad614SDennis Dalessandro ps->s_txreq = get_txreq(ps->dev, qp); 273f48ad614SDennis Dalessandro if (IS_ERR(ps->s_txreq)) 274f48ad614SDennis Dalessandro goto bail_no_tx; 275f48ad614SDennis Dalessandro 276f48ad614SDennis Dalessandro ohdr = &ps->s_txreq->phdr.hdr.u.oth; 277f48ad614SDennis Dalessandro if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) 278f48ad614SDennis Dalessandro ohdr = &ps->s_txreq->phdr.hdr.u.l.oth; 279f48ad614SDennis Dalessandro 280f48ad614SDennis Dalessandro /* Sending responses has higher priority over sending requests. */ 281f48ad614SDennis Dalessandro if ((qp->s_flags & RVT_S_RESP_PENDING) && 282f48ad614SDennis Dalessandro make_rc_ack(dev, qp, ohdr, ps)) 283f48ad614SDennis Dalessandro return 1; 284f48ad614SDennis Dalessandro 285f48ad614SDennis Dalessandro if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) { 286f48ad614SDennis Dalessandro if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND)) 287f48ad614SDennis Dalessandro goto bail; 288f48ad614SDennis Dalessandro /* We are in the error state, flush the work request. */ 289f48ad614SDennis Dalessandro smp_read_barrier_depends(); /* see post_one_send() */ 290eb04ff09SMike Marciniszyn if (qp->s_last == READ_ONCE(qp->s_head)) 291f48ad614SDennis Dalessandro goto bail; 292f48ad614SDennis Dalessandro /* If DMAs are in progress, we can't flush immediately. */ 293f48ad614SDennis Dalessandro if (iowait_sdma_pending(&priv->s_iowait)) { 294f48ad614SDennis Dalessandro qp->s_flags |= RVT_S_WAIT_DMA; 295f48ad614SDennis Dalessandro goto bail; 296f48ad614SDennis Dalessandro } 297f48ad614SDennis Dalessandro clear_ahg(qp); 298f48ad614SDennis Dalessandro wqe = rvt_get_swqe_ptr(qp, qp->s_last); 299f48ad614SDennis Dalessandro hfi1_send_complete(qp, wqe, qp->s_last != qp->s_acked ? 300f48ad614SDennis Dalessandro IB_WC_SUCCESS : IB_WC_WR_FLUSH_ERR); 301f48ad614SDennis Dalessandro /* will get called again */ 302f48ad614SDennis Dalessandro goto done_free_tx; 303f48ad614SDennis Dalessandro } 304f48ad614SDennis Dalessandro 305f48ad614SDennis Dalessandro if (qp->s_flags & (RVT_S_WAIT_RNR | RVT_S_WAIT_ACK)) 306f48ad614SDennis Dalessandro goto bail; 307f48ad614SDennis Dalessandro 308f48ad614SDennis Dalessandro if (cmp_psn(qp->s_psn, qp->s_sending_hpsn) <= 0) { 309f48ad614SDennis Dalessandro if (cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) { 310f48ad614SDennis Dalessandro qp->s_flags |= RVT_S_WAIT_PSN; 311f48ad614SDennis Dalessandro goto bail; 312f48ad614SDennis Dalessandro } 313f48ad614SDennis Dalessandro qp->s_sending_psn = qp->s_psn; 314f48ad614SDennis Dalessandro qp->s_sending_hpsn = qp->s_psn - 1; 315f48ad614SDennis Dalessandro } 316f48ad614SDennis Dalessandro 317f48ad614SDennis Dalessandro /* Send a request. */ 318f48ad614SDennis Dalessandro wqe = rvt_get_swqe_ptr(qp, qp->s_cur); 319f48ad614SDennis Dalessandro switch (qp->s_state) { 320f48ad614SDennis Dalessandro default: 321f48ad614SDennis Dalessandro if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) 322f48ad614SDennis Dalessandro goto bail; 323f48ad614SDennis Dalessandro /* 324f48ad614SDennis Dalessandro * Resend an old request or start a new one. 325f48ad614SDennis Dalessandro * 326f48ad614SDennis Dalessandro * We keep track of the current SWQE so that 327f48ad614SDennis Dalessandro * we don't reset the "furthest progress" state 328f48ad614SDennis Dalessandro * if we need to back up. 329f48ad614SDennis Dalessandro */ 330f48ad614SDennis Dalessandro newreq = 0; 331f48ad614SDennis Dalessandro if (qp->s_cur == qp->s_tail) { 332f48ad614SDennis Dalessandro /* Check if send work queue is empty. */ 333eb04ff09SMike Marciniszyn smp_read_barrier_depends(); /* see post_one_send() */ 334eb04ff09SMike Marciniszyn if (qp->s_tail == READ_ONCE(qp->s_head)) { 335f48ad614SDennis Dalessandro clear_ahg(qp); 336f48ad614SDennis Dalessandro goto bail; 337f48ad614SDennis Dalessandro } 338f48ad614SDennis Dalessandro /* 339f48ad614SDennis Dalessandro * If a fence is requested, wait for previous 340f48ad614SDennis Dalessandro * RDMA read and atomic operations to finish. 341f48ad614SDennis Dalessandro */ 342f48ad614SDennis Dalessandro if ((wqe->wr.send_flags & IB_SEND_FENCE) && 343f48ad614SDennis Dalessandro qp->s_num_rd_atomic) { 344f48ad614SDennis Dalessandro qp->s_flags |= RVT_S_WAIT_FENCE; 345f48ad614SDennis Dalessandro goto bail; 346f48ad614SDennis Dalessandro } 3470db3dfa0SJianxin Xiong /* 3480db3dfa0SJianxin Xiong * Local operations are processed immediately 3490db3dfa0SJianxin Xiong * after all prior requests have completed 3500db3dfa0SJianxin Xiong */ 3510db3dfa0SJianxin Xiong if (wqe->wr.opcode == IB_WR_REG_MR || 3520db3dfa0SJianxin Xiong wqe->wr.opcode == IB_WR_LOCAL_INV) { 353d9b13c20SJianxin Xiong int local_ops = 0; 354d9b13c20SJianxin Xiong int err = 0; 355d9b13c20SJianxin Xiong 3560db3dfa0SJianxin Xiong if (qp->s_last != qp->s_cur) 3570db3dfa0SJianxin Xiong goto bail; 3580db3dfa0SJianxin Xiong if (++qp->s_cur == qp->s_size) 3590db3dfa0SJianxin Xiong qp->s_cur = 0; 3600db3dfa0SJianxin Xiong if (++qp->s_tail == qp->s_size) 3610db3dfa0SJianxin Xiong qp->s_tail = 0; 362d9b13c20SJianxin Xiong if (!(wqe->wr.send_flags & 363d9b13c20SJianxin Xiong RVT_SEND_COMPLETION_ONLY)) { 3640db3dfa0SJianxin Xiong err = rvt_invalidate_rkey( 3650db3dfa0SJianxin Xiong qp, 3660db3dfa0SJianxin Xiong wqe->wr.ex.invalidate_rkey); 367d9b13c20SJianxin Xiong local_ops = 1; 368d9b13c20SJianxin Xiong } 3690db3dfa0SJianxin Xiong hfi1_send_complete(qp, wqe, 3700db3dfa0SJianxin Xiong err ? IB_WC_LOC_PROT_ERR 3710db3dfa0SJianxin Xiong : IB_WC_SUCCESS); 372d9b13c20SJianxin Xiong if (local_ops) 3730db3dfa0SJianxin Xiong atomic_dec(&qp->local_ops_pending); 3740db3dfa0SJianxin Xiong qp->s_hdrwords = 0; 3750db3dfa0SJianxin Xiong goto done_free_tx; 3760db3dfa0SJianxin Xiong } 3770db3dfa0SJianxin Xiong 378f48ad614SDennis Dalessandro newreq = 1; 379f48ad614SDennis Dalessandro qp->s_psn = wqe->psn; 380f48ad614SDennis Dalessandro } 381f48ad614SDennis Dalessandro /* 382f48ad614SDennis Dalessandro * Note that we have to be careful not to modify the 383f48ad614SDennis Dalessandro * original work request since we may need to resend 384f48ad614SDennis Dalessandro * it. 385f48ad614SDennis Dalessandro */ 386f48ad614SDennis Dalessandro len = wqe->length; 387f48ad614SDennis Dalessandro ss = &qp->s_sge; 388f48ad614SDennis Dalessandro bth2 = mask_psn(qp->s_psn); 389f48ad614SDennis Dalessandro switch (wqe->wr.opcode) { 390f48ad614SDennis Dalessandro case IB_WR_SEND: 391f48ad614SDennis Dalessandro case IB_WR_SEND_WITH_IMM: 3920db3dfa0SJianxin Xiong case IB_WR_SEND_WITH_INV: 393f48ad614SDennis Dalessandro /* If no credit, return. */ 394f48ad614SDennis Dalessandro if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) && 395696513e8SBrian Welty rvt_cmp_msn(wqe->ssn, qp->s_lsn + 1) > 0) { 396f48ad614SDennis Dalessandro qp->s_flags |= RVT_S_WAIT_SSN_CREDIT; 397f48ad614SDennis Dalessandro goto bail; 398f48ad614SDennis Dalessandro } 399f48ad614SDennis Dalessandro if (len > pmtu) { 400f48ad614SDennis Dalessandro qp->s_state = OP(SEND_FIRST); 401f48ad614SDennis Dalessandro len = pmtu; 402f48ad614SDennis Dalessandro break; 403f48ad614SDennis Dalessandro } 404f48ad614SDennis Dalessandro if (wqe->wr.opcode == IB_WR_SEND) { 405f48ad614SDennis Dalessandro qp->s_state = OP(SEND_ONLY); 4060db3dfa0SJianxin Xiong } else if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) { 407f48ad614SDennis Dalessandro qp->s_state = OP(SEND_ONLY_WITH_IMMEDIATE); 408f48ad614SDennis Dalessandro /* Immediate data comes after the BTH */ 409f48ad614SDennis Dalessandro ohdr->u.imm_data = wqe->wr.ex.imm_data; 410f48ad614SDennis Dalessandro hwords += 1; 4110db3dfa0SJianxin Xiong } else { 4120db3dfa0SJianxin Xiong qp->s_state = OP(SEND_ONLY_WITH_INVALIDATE); 4130db3dfa0SJianxin Xiong /* Invalidate rkey comes after the BTH */ 4140db3dfa0SJianxin Xiong ohdr->u.ieth = cpu_to_be32( 4150db3dfa0SJianxin Xiong wqe->wr.ex.invalidate_rkey); 4160db3dfa0SJianxin Xiong hwords += 1; 417f48ad614SDennis Dalessandro } 418f48ad614SDennis Dalessandro if (wqe->wr.send_flags & IB_SEND_SOLICITED) 419f48ad614SDennis Dalessandro bth0 |= IB_BTH_SOLICITED; 420f48ad614SDennis Dalessandro bth2 |= IB_BTH_REQ_ACK; 421f48ad614SDennis Dalessandro if (++qp->s_cur == qp->s_size) 422f48ad614SDennis Dalessandro qp->s_cur = 0; 423f48ad614SDennis Dalessandro break; 424f48ad614SDennis Dalessandro 425f48ad614SDennis Dalessandro case IB_WR_RDMA_WRITE: 426f48ad614SDennis Dalessandro if (newreq && !(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) 427f48ad614SDennis Dalessandro qp->s_lsn++; 428f48ad614SDennis Dalessandro /* FALLTHROUGH */ 429f48ad614SDennis Dalessandro case IB_WR_RDMA_WRITE_WITH_IMM: 430f48ad614SDennis Dalessandro /* If no credit, return. */ 431f48ad614SDennis Dalessandro if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) && 432696513e8SBrian Welty rvt_cmp_msn(wqe->ssn, qp->s_lsn + 1) > 0) { 433f48ad614SDennis Dalessandro qp->s_flags |= RVT_S_WAIT_SSN_CREDIT; 434f48ad614SDennis Dalessandro goto bail; 435f48ad614SDennis Dalessandro } 436261a4351SMike Marciniszyn put_ib_reth_vaddr( 437261a4351SMike Marciniszyn wqe->rdma_wr.remote_addr, 438261a4351SMike Marciniszyn &ohdr->u.rc.reth); 439f48ad614SDennis Dalessandro ohdr->u.rc.reth.rkey = 440f48ad614SDennis Dalessandro cpu_to_be32(wqe->rdma_wr.rkey); 441f48ad614SDennis Dalessandro ohdr->u.rc.reth.length = cpu_to_be32(len); 442f48ad614SDennis Dalessandro hwords += sizeof(struct ib_reth) / sizeof(u32); 443f48ad614SDennis Dalessandro if (len > pmtu) { 444f48ad614SDennis Dalessandro qp->s_state = OP(RDMA_WRITE_FIRST); 445f48ad614SDennis Dalessandro len = pmtu; 446f48ad614SDennis Dalessandro break; 447f48ad614SDennis Dalessandro } 448f48ad614SDennis Dalessandro if (wqe->wr.opcode == IB_WR_RDMA_WRITE) { 449f48ad614SDennis Dalessandro qp->s_state = OP(RDMA_WRITE_ONLY); 450f48ad614SDennis Dalessandro } else { 451f48ad614SDennis Dalessandro qp->s_state = 452f48ad614SDennis Dalessandro OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE); 453f48ad614SDennis Dalessandro /* Immediate data comes after RETH */ 454f48ad614SDennis Dalessandro ohdr->u.rc.imm_data = wqe->wr.ex.imm_data; 455f48ad614SDennis Dalessandro hwords += 1; 456f48ad614SDennis Dalessandro if (wqe->wr.send_flags & IB_SEND_SOLICITED) 457f48ad614SDennis Dalessandro bth0 |= IB_BTH_SOLICITED; 458f48ad614SDennis Dalessandro } 459f48ad614SDennis Dalessandro bth2 |= IB_BTH_REQ_ACK; 460f48ad614SDennis Dalessandro if (++qp->s_cur == qp->s_size) 461f48ad614SDennis Dalessandro qp->s_cur = 0; 462f48ad614SDennis Dalessandro break; 463f48ad614SDennis Dalessandro 464f48ad614SDennis Dalessandro case IB_WR_RDMA_READ: 465f48ad614SDennis Dalessandro /* 466f48ad614SDennis Dalessandro * Don't allow more operations to be started 467f48ad614SDennis Dalessandro * than the QP limits allow. 468f48ad614SDennis Dalessandro */ 469f48ad614SDennis Dalessandro if (newreq) { 470f48ad614SDennis Dalessandro if (qp->s_num_rd_atomic >= 471f48ad614SDennis Dalessandro qp->s_max_rd_atomic) { 472f48ad614SDennis Dalessandro qp->s_flags |= RVT_S_WAIT_RDMAR; 473f48ad614SDennis Dalessandro goto bail; 474f48ad614SDennis Dalessandro } 475f48ad614SDennis Dalessandro qp->s_num_rd_atomic++; 476f48ad614SDennis Dalessandro if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) 477f48ad614SDennis Dalessandro qp->s_lsn++; 478f48ad614SDennis Dalessandro } 479261a4351SMike Marciniszyn put_ib_reth_vaddr( 480261a4351SMike Marciniszyn wqe->rdma_wr.remote_addr, 481261a4351SMike Marciniszyn &ohdr->u.rc.reth); 482f48ad614SDennis Dalessandro ohdr->u.rc.reth.rkey = 483f48ad614SDennis Dalessandro cpu_to_be32(wqe->rdma_wr.rkey); 484f48ad614SDennis Dalessandro ohdr->u.rc.reth.length = cpu_to_be32(len); 485f48ad614SDennis Dalessandro qp->s_state = OP(RDMA_READ_REQUEST); 486f48ad614SDennis Dalessandro hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); 487f48ad614SDennis Dalessandro ss = NULL; 488f48ad614SDennis Dalessandro len = 0; 489f48ad614SDennis Dalessandro bth2 |= IB_BTH_REQ_ACK; 490f48ad614SDennis Dalessandro if (++qp->s_cur == qp->s_size) 491f48ad614SDennis Dalessandro qp->s_cur = 0; 492f48ad614SDennis Dalessandro break; 493f48ad614SDennis Dalessandro 494f48ad614SDennis Dalessandro case IB_WR_ATOMIC_CMP_AND_SWP: 495f48ad614SDennis Dalessandro case IB_WR_ATOMIC_FETCH_AND_ADD: 496f48ad614SDennis Dalessandro /* 497f48ad614SDennis Dalessandro * Don't allow more operations to be started 498f48ad614SDennis Dalessandro * than the QP limits allow. 499f48ad614SDennis Dalessandro */ 500f48ad614SDennis Dalessandro if (newreq) { 501f48ad614SDennis Dalessandro if (qp->s_num_rd_atomic >= 502f48ad614SDennis Dalessandro qp->s_max_rd_atomic) { 503f48ad614SDennis Dalessandro qp->s_flags |= RVT_S_WAIT_RDMAR; 504f48ad614SDennis Dalessandro goto bail; 505f48ad614SDennis Dalessandro } 506f48ad614SDennis Dalessandro qp->s_num_rd_atomic++; 507f48ad614SDennis Dalessandro if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) 508f48ad614SDennis Dalessandro qp->s_lsn++; 509f48ad614SDennis Dalessandro } 510f48ad614SDennis Dalessandro if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) { 511f48ad614SDennis Dalessandro qp->s_state = OP(COMPARE_SWAP); 512261a4351SMike Marciniszyn put_ib_ateth_swap(wqe->atomic_wr.swap, 513261a4351SMike Marciniszyn &ohdr->u.atomic_eth); 514261a4351SMike Marciniszyn put_ib_ateth_compare(wqe->atomic_wr.compare_add, 515261a4351SMike Marciniszyn &ohdr->u.atomic_eth); 516f48ad614SDennis Dalessandro } else { 517f48ad614SDennis Dalessandro qp->s_state = OP(FETCH_ADD); 518261a4351SMike Marciniszyn put_ib_ateth_swap(wqe->atomic_wr.compare_add, 519261a4351SMike Marciniszyn &ohdr->u.atomic_eth); 520261a4351SMike Marciniszyn put_ib_ateth_compare(0, &ohdr->u.atomic_eth); 521f48ad614SDennis Dalessandro } 522261a4351SMike Marciniszyn put_ib_ateth_vaddr(wqe->atomic_wr.remote_addr, 523261a4351SMike Marciniszyn &ohdr->u.atomic_eth); 524f48ad614SDennis Dalessandro ohdr->u.atomic_eth.rkey = cpu_to_be32( 525f48ad614SDennis Dalessandro wqe->atomic_wr.rkey); 526f48ad614SDennis Dalessandro hwords += sizeof(struct ib_atomic_eth) / sizeof(u32); 527f48ad614SDennis Dalessandro ss = NULL; 528f48ad614SDennis Dalessandro len = 0; 529f48ad614SDennis Dalessandro bth2 |= IB_BTH_REQ_ACK; 530f48ad614SDennis Dalessandro if (++qp->s_cur == qp->s_size) 531f48ad614SDennis Dalessandro qp->s_cur = 0; 532f48ad614SDennis Dalessandro break; 533f48ad614SDennis Dalessandro 534f48ad614SDennis Dalessandro default: 535f48ad614SDennis Dalessandro goto bail; 536f48ad614SDennis Dalessandro } 537f48ad614SDennis Dalessandro qp->s_sge.sge = wqe->sg_list[0]; 538f48ad614SDennis Dalessandro qp->s_sge.sg_list = wqe->sg_list + 1; 539f48ad614SDennis Dalessandro qp->s_sge.num_sge = wqe->wr.num_sge; 540f48ad614SDennis Dalessandro qp->s_sge.total_len = wqe->length; 541f48ad614SDennis Dalessandro qp->s_len = wqe->length; 542f48ad614SDennis Dalessandro if (newreq) { 543f48ad614SDennis Dalessandro qp->s_tail++; 544f48ad614SDennis Dalessandro if (qp->s_tail >= qp->s_size) 545f48ad614SDennis Dalessandro qp->s_tail = 0; 546f48ad614SDennis Dalessandro } 547f48ad614SDennis Dalessandro if (wqe->wr.opcode == IB_WR_RDMA_READ) 548f48ad614SDennis Dalessandro qp->s_psn = wqe->lpsn + 1; 549f48ad614SDennis Dalessandro else 550f48ad614SDennis Dalessandro qp->s_psn++; 551f48ad614SDennis Dalessandro break; 552f48ad614SDennis Dalessandro 553f48ad614SDennis Dalessandro case OP(RDMA_READ_RESPONSE_FIRST): 554f48ad614SDennis Dalessandro /* 555f48ad614SDennis Dalessandro * qp->s_state is normally set to the opcode of the 556f48ad614SDennis Dalessandro * last packet constructed for new requests and therefore 557f48ad614SDennis Dalessandro * is never set to RDMA read response. 558f48ad614SDennis Dalessandro * RDMA_READ_RESPONSE_FIRST is used by the ACK processing 559f48ad614SDennis Dalessandro * thread to indicate a SEND needs to be restarted from an 560f48ad614SDennis Dalessandro * earlier PSN without interfering with the sending thread. 561f48ad614SDennis Dalessandro * See restart_rc(). 562f48ad614SDennis Dalessandro */ 563f48ad614SDennis Dalessandro qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu); 564f48ad614SDennis Dalessandro /* FALLTHROUGH */ 565f48ad614SDennis Dalessandro case OP(SEND_FIRST): 566f48ad614SDennis Dalessandro qp->s_state = OP(SEND_MIDDLE); 567f48ad614SDennis Dalessandro /* FALLTHROUGH */ 568f48ad614SDennis Dalessandro case OP(SEND_MIDDLE): 569f48ad614SDennis Dalessandro bth2 = mask_psn(qp->s_psn++); 570f48ad614SDennis Dalessandro ss = &qp->s_sge; 571f48ad614SDennis Dalessandro len = qp->s_len; 572f48ad614SDennis Dalessandro if (len > pmtu) { 573f48ad614SDennis Dalessandro len = pmtu; 574f48ad614SDennis Dalessandro middle = HFI1_CAP_IS_KSET(SDMA_AHG); 575f48ad614SDennis Dalessandro break; 576f48ad614SDennis Dalessandro } 577f48ad614SDennis Dalessandro if (wqe->wr.opcode == IB_WR_SEND) { 578f48ad614SDennis Dalessandro qp->s_state = OP(SEND_LAST); 5790db3dfa0SJianxin Xiong } else if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) { 580f48ad614SDennis Dalessandro qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE); 581f48ad614SDennis Dalessandro /* Immediate data comes after the BTH */ 582f48ad614SDennis Dalessandro ohdr->u.imm_data = wqe->wr.ex.imm_data; 583f48ad614SDennis Dalessandro hwords += 1; 5840db3dfa0SJianxin Xiong } else { 5850db3dfa0SJianxin Xiong qp->s_state = OP(SEND_LAST_WITH_INVALIDATE); 5860db3dfa0SJianxin Xiong /* invalidate data comes after the BTH */ 5870db3dfa0SJianxin Xiong ohdr->u.ieth = cpu_to_be32(wqe->wr.ex.invalidate_rkey); 5880db3dfa0SJianxin Xiong hwords += 1; 589f48ad614SDennis Dalessandro } 590f48ad614SDennis Dalessandro if (wqe->wr.send_flags & IB_SEND_SOLICITED) 591f48ad614SDennis Dalessandro bth0 |= IB_BTH_SOLICITED; 592f48ad614SDennis Dalessandro bth2 |= IB_BTH_REQ_ACK; 593f48ad614SDennis Dalessandro qp->s_cur++; 594f48ad614SDennis Dalessandro if (qp->s_cur >= qp->s_size) 595f48ad614SDennis Dalessandro qp->s_cur = 0; 596f48ad614SDennis Dalessandro break; 597f48ad614SDennis Dalessandro 598f48ad614SDennis Dalessandro case OP(RDMA_READ_RESPONSE_LAST): 599f48ad614SDennis Dalessandro /* 600f48ad614SDennis Dalessandro * qp->s_state is normally set to the opcode of the 601f48ad614SDennis Dalessandro * last packet constructed for new requests and therefore 602f48ad614SDennis Dalessandro * is never set to RDMA read response. 603f48ad614SDennis Dalessandro * RDMA_READ_RESPONSE_LAST is used by the ACK processing 604f48ad614SDennis Dalessandro * thread to indicate a RDMA write needs to be restarted from 605f48ad614SDennis Dalessandro * an earlier PSN without interfering with the sending thread. 606f48ad614SDennis Dalessandro * See restart_rc(). 607f48ad614SDennis Dalessandro */ 608f48ad614SDennis Dalessandro qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu); 609f48ad614SDennis Dalessandro /* FALLTHROUGH */ 610f48ad614SDennis Dalessandro case OP(RDMA_WRITE_FIRST): 611f48ad614SDennis Dalessandro qp->s_state = OP(RDMA_WRITE_MIDDLE); 612f48ad614SDennis Dalessandro /* FALLTHROUGH */ 613f48ad614SDennis Dalessandro case OP(RDMA_WRITE_MIDDLE): 614f48ad614SDennis Dalessandro bth2 = mask_psn(qp->s_psn++); 615f48ad614SDennis Dalessandro ss = &qp->s_sge; 616f48ad614SDennis Dalessandro len = qp->s_len; 617f48ad614SDennis Dalessandro if (len > pmtu) { 618f48ad614SDennis Dalessandro len = pmtu; 619f48ad614SDennis Dalessandro middle = HFI1_CAP_IS_KSET(SDMA_AHG); 620f48ad614SDennis Dalessandro break; 621f48ad614SDennis Dalessandro } 622f48ad614SDennis Dalessandro if (wqe->wr.opcode == IB_WR_RDMA_WRITE) { 623f48ad614SDennis Dalessandro qp->s_state = OP(RDMA_WRITE_LAST); 624f48ad614SDennis Dalessandro } else { 625f48ad614SDennis Dalessandro qp->s_state = OP(RDMA_WRITE_LAST_WITH_IMMEDIATE); 626f48ad614SDennis Dalessandro /* Immediate data comes after the BTH */ 627f48ad614SDennis Dalessandro ohdr->u.imm_data = wqe->wr.ex.imm_data; 628f48ad614SDennis Dalessandro hwords += 1; 629f48ad614SDennis Dalessandro if (wqe->wr.send_flags & IB_SEND_SOLICITED) 630f48ad614SDennis Dalessandro bth0 |= IB_BTH_SOLICITED; 631f48ad614SDennis Dalessandro } 632f48ad614SDennis Dalessandro bth2 |= IB_BTH_REQ_ACK; 633f48ad614SDennis Dalessandro qp->s_cur++; 634f48ad614SDennis Dalessandro if (qp->s_cur >= qp->s_size) 635f48ad614SDennis Dalessandro qp->s_cur = 0; 636f48ad614SDennis Dalessandro break; 637f48ad614SDennis Dalessandro 638f48ad614SDennis Dalessandro case OP(RDMA_READ_RESPONSE_MIDDLE): 639f48ad614SDennis Dalessandro /* 640f48ad614SDennis Dalessandro * qp->s_state is normally set to the opcode of the 641f48ad614SDennis Dalessandro * last packet constructed for new requests and therefore 642f48ad614SDennis Dalessandro * is never set to RDMA read response. 643f48ad614SDennis Dalessandro * RDMA_READ_RESPONSE_MIDDLE is used by the ACK processing 644f48ad614SDennis Dalessandro * thread to indicate a RDMA read needs to be restarted from 645f48ad614SDennis Dalessandro * an earlier PSN without interfering with the sending thread. 646f48ad614SDennis Dalessandro * See restart_rc(). 647f48ad614SDennis Dalessandro */ 648f48ad614SDennis Dalessandro len = (delta_psn(qp->s_psn, wqe->psn)) * pmtu; 649261a4351SMike Marciniszyn put_ib_reth_vaddr( 650261a4351SMike Marciniszyn wqe->rdma_wr.remote_addr + len, 651261a4351SMike Marciniszyn &ohdr->u.rc.reth); 652f48ad614SDennis Dalessandro ohdr->u.rc.reth.rkey = 653f48ad614SDennis Dalessandro cpu_to_be32(wqe->rdma_wr.rkey); 654f48ad614SDennis Dalessandro ohdr->u.rc.reth.length = cpu_to_be32(wqe->length - len); 655f48ad614SDennis Dalessandro qp->s_state = OP(RDMA_READ_REQUEST); 656f48ad614SDennis Dalessandro hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); 657f48ad614SDennis Dalessandro bth2 = mask_psn(qp->s_psn) | IB_BTH_REQ_ACK; 658f48ad614SDennis Dalessandro qp->s_psn = wqe->lpsn + 1; 659f48ad614SDennis Dalessandro ss = NULL; 660f48ad614SDennis Dalessandro len = 0; 661f48ad614SDennis Dalessandro qp->s_cur++; 662f48ad614SDennis Dalessandro if (qp->s_cur == qp->s_size) 663f48ad614SDennis Dalessandro qp->s_cur = 0; 664f48ad614SDennis Dalessandro break; 665f48ad614SDennis Dalessandro } 666f48ad614SDennis Dalessandro qp->s_sending_hpsn = bth2; 667f48ad614SDennis Dalessandro delta = delta_psn(bth2, wqe->psn); 668f48ad614SDennis Dalessandro if (delta && delta % HFI1_PSN_CREDIT == 0) 669f48ad614SDennis Dalessandro bth2 |= IB_BTH_REQ_ACK; 670f48ad614SDennis Dalessandro if (qp->s_flags & RVT_S_SEND_ONE) { 671f48ad614SDennis Dalessandro qp->s_flags &= ~RVT_S_SEND_ONE; 672f48ad614SDennis Dalessandro qp->s_flags |= RVT_S_WAIT_ACK; 673f48ad614SDennis Dalessandro bth2 |= IB_BTH_REQ_ACK; 674f48ad614SDennis Dalessandro } 675f48ad614SDennis Dalessandro qp->s_len -= len; 676f48ad614SDennis Dalessandro qp->s_hdrwords = hwords; 677f48ad614SDennis Dalessandro ps->s_txreq->sde = priv->s_sde; 678b777f154SMitko Haralanov ps->s_txreq->ss = ss; 679e922ae06SDon Hiatt ps->s_txreq->s_cur_size = len; 680f48ad614SDennis Dalessandro hfi1_make_ruc_header( 681f48ad614SDennis Dalessandro qp, 682f48ad614SDennis Dalessandro ohdr, 683f48ad614SDennis Dalessandro bth0 | (qp->s_state << 24), 684f48ad614SDennis Dalessandro bth2, 685f48ad614SDennis Dalessandro middle, 686f48ad614SDennis Dalessandro ps); 687f48ad614SDennis Dalessandro /* pbc */ 688f48ad614SDennis Dalessandro ps->s_txreq->hdr_dwords = qp->s_hdrwords + 2; 689f48ad614SDennis Dalessandro return 1; 690f48ad614SDennis Dalessandro 691f48ad614SDennis Dalessandro done_free_tx: 692f48ad614SDennis Dalessandro hfi1_put_txreq(ps->s_txreq); 693f48ad614SDennis Dalessandro ps->s_txreq = NULL; 694f48ad614SDennis Dalessandro return 1; 695f48ad614SDennis Dalessandro 696f48ad614SDennis Dalessandro bail: 697f48ad614SDennis Dalessandro hfi1_put_txreq(ps->s_txreq); 698f48ad614SDennis Dalessandro 699f48ad614SDennis Dalessandro bail_no_tx: 700f48ad614SDennis Dalessandro ps->s_txreq = NULL; 701f48ad614SDennis Dalessandro qp->s_flags &= ~RVT_S_BUSY; 702f48ad614SDennis Dalessandro qp->s_hdrwords = 0; 703f48ad614SDennis Dalessandro return 0; 704f48ad614SDennis Dalessandro } 705f48ad614SDennis Dalessandro 706f48ad614SDennis Dalessandro /** 707f48ad614SDennis Dalessandro * hfi1_send_rc_ack - Construct an ACK packet and send it 708f48ad614SDennis Dalessandro * @qp: a pointer to the QP 709f48ad614SDennis Dalessandro * 710f48ad614SDennis Dalessandro * This is called from hfi1_rc_rcv() and handle_receive_interrupt(). 711f48ad614SDennis Dalessandro * Note that RDMA reads and atomics are handled in the 712ca00c62bSDennis Dalessandro * send side QP state and send engine. 713f48ad614SDennis Dalessandro */ 714f48ad614SDennis Dalessandro void hfi1_send_rc_ack(struct hfi1_ctxtdata *rcd, struct rvt_qp *qp, 715f48ad614SDennis Dalessandro int is_fecn) 716f48ad614SDennis Dalessandro { 717f3e862cbSSebastian Sanchez struct hfi1_ibport *ibp = rcd_to_iport(rcd); 718f48ad614SDennis Dalessandro struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); 719f48ad614SDennis Dalessandro u64 pbc, pbc_flags = 0; 720f48ad614SDennis Dalessandro u16 lrh0; 721f48ad614SDennis Dalessandro u16 sc5; 722f48ad614SDennis Dalessandro u32 bth0; 723f48ad614SDennis Dalessandro u32 hwords; 724f48ad614SDennis Dalessandro u32 vl, plen; 725f48ad614SDennis Dalessandro struct send_context *sc; 726f48ad614SDennis Dalessandro struct pio_buf *pbuf; 727261a4351SMike Marciniszyn struct ib_header hdr; 728261a4351SMike Marciniszyn struct ib_other_headers *ohdr; 729f48ad614SDennis Dalessandro unsigned long flags; 7304fcf1de5SMike Marciniszyn struct hfi1_qp_priv *priv = qp->priv; 7314fcf1de5SMike Marciniszyn 7324fcf1de5SMike Marciniszyn /* clear the defer count */ 7334fcf1de5SMike Marciniszyn priv->r_adefered = 0; 734f48ad614SDennis Dalessandro 735f48ad614SDennis Dalessandro /* Don't send ACK or NAK if a RDMA read or atomic is pending. */ 736f48ad614SDennis Dalessandro if (qp->s_flags & RVT_S_RESP_PENDING) 737f48ad614SDennis Dalessandro goto queue_ack; 738f48ad614SDennis Dalessandro 739f48ad614SDennis Dalessandro /* Ensure s_rdma_ack_cnt changes are committed */ 740f48ad614SDennis Dalessandro smp_read_barrier_depends(); 741f48ad614SDennis Dalessandro if (qp->s_rdma_ack_cnt) 742f48ad614SDennis Dalessandro goto queue_ack; 743f48ad614SDennis Dalessandro 744f48ad614SDennis Dalessandro /* Construct the header */ 745f48ad614SDennis Dalessandro /* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4 */ 746f48ad614SDennis Dalessandro hwords = 6; 747f48ad614SDennis Dalessandro if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { 748f48ad614SDennis Dalessandro hwords += hfi1_make_grh(ibp, &hdr.u.l.grh, 749f48ad614SDennis Dalessandro &qp->remote_ah_attr.grh, hwords, 0); 750f48ad614SDennis Dalessandro ohdr = &hdr.u.l.oth; 751f48ad614SDennis Dalessandro lrh0 = HFI1_LRH_GRH; 752f48ad614SDennis Dalessandro } else { 753f48ad614SDennis Dalessandro ohdr = &hdr.u.oth; 754f48ad614SDennis Dalessandro lrh0 = HFI1_LRH_BTH; 755f48ad614SDennis Dalessandro } 756f48ad614SDennis Dalessandro /* read pkey_index w/o lock (its atomic) */ 757f48ad614SDennis Dalessandro bth0 = hfi1_get_pkey(ibp, qp->s_pkey_index) | (OP(ACKNOWLEDGE) << 24); 758f48ad614SDennis Dalessandro if (qp->s_mig_state == IB_MIG_MIGRATED) 759f48ad614SDennis Dalessandro bth0 |= IB_BTH_MIG_REQ; 760f48ad614SDennis Dalessandro if (qp->r_nak_state) 761696513e8SBrian Welty ohdr->u.aeth = cpu_to_be32((qp->r_msn & RVT_MSN_MASK) | 762f48ad614SDennis Dalessandro (qp->r_nak_state << 763696513e8SBrian Welty RVT_AETH_CREDIT_SHIFT)); 764f48ad614SDennis Dalessandro else 765696513e8SBrian Welty ohdr->u.aeth = rvt_compute_aeth(qp); 766f48ad614SDennis Dalessandro sc5 = ibp->sl_to_sc[qp->remote_ah_attr.sl]; 767f48ad614SDennis Dalessandro /* set PBC_DC_INFO bit (aka SC[4]) in pbc_flags */ 768f48ad614SDennis Dalessandro pbc_flags |= ((!!(sc5 & 0x10)) << PBC_DC_INFO_SHIFT); 769f48ad614SDennis Dalessandro lrh0 |= (sc5 & 0xf) << 12 | (qp->remote_ah_attr.sl & 0xf) << 4; 770f48ad614SDennis Dalessandro hdr.lrh[0] = cpu_to_be16(lrh0); 771f48ad614SDennis Dalessandro hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); 772f48ad614SDennis Dalessandro hdr.lrh[2] = cpu_to_be16(hwords + SIZE_OF_CRC); 773f48ad614SDennis Dalessandro hdr.lrh[3] = cpu_to_be16(ppd->lid | qp->remote_ah_attr.src_path_bits); 774f48ad614SDennis Dalessandro ohdr->bth[0] = cpu_to_be32(bth0); 775f48ad614SDennis Dalessandro ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); 776f48ad614SDennis Dalessandro ohdr->bth[1] |= cpu_to_be32((!!is_fecn) << HFI1_BECN_SHIFT); 777f48ad614SDennis Dalessandro ohdr->bth[2] = cpu_to_be32(mask_psn(qp->r_ack_psn)); 778f48ad614SDennis Dalessandro 779f48ad614SDennis Dalessandro /* Don't try to send ACKs if the link isn't ACTIVE */ 780f48ad614SDennis Dalessandro if (driver_lstate(ppd) != IB_PORT_ACTIVE) 781f48ad614SDennis Dalessandro return; 782f48ad614SDennis Dalessandro 783f48ad614SDennis Dalessandro sc = rcd->sc; 784f48ad614SDennis Dalessandro plen = 2 /* PBC */ + hwords; 785f48ad614SDennis Dalessandro vl = sc_to_vlt(ppd->dd, sc5); 786f48ad614SDennis Dalessandro pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen); 787f48ad614SDennis Dalessandro 788f48ad614SDennis Dalessandro pbuf = sc_buffer_alloc(sc, plen, NULL, NULL); 789f48ad614SDennis Dalessandro if (!pbuf) { 790f48ad614SDennis Dalessandro /* 791f48ad614SDennis Dalessandro * We have no room to send at the moment. Pass 792ca00c62bSDennis Dalessandro * responsibility for sending the ACK to the send engine 793f48ad614SDennis Dalessandro * so that when enough buffer space becomes available, 794f48ad614SDennis Dalessandro * the ACK is sent ahead of other outgoing packets. 795f48ad614SDennis Dalessandro */ 796f48ad614SDennis Dalessandro goto queue_ack; 797f48ad614SDennis Dalessandro } 798f48ad614SDennis Dalessandro 799f48ad614SDennis Dalessandro trace_ack_output_ibhdr(dd_from_ibdev(qp->ibqp.device), &hdr); 800f48ad614SDennis Dalessandro 801f48ad614SDennis Dalessandro /* write the pbc and data */ 802f48ad614SDennis Dalessandro ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc, &hdr, hwords); 803f48ad614SDennis Dalessandro 804f48ad614SDennis Dalessandro return; 805f48ad614SDennis Dalessandro 806f48ad614SDennis Dalessandro queue_ack: 807f48ad614SDennis Dalessandro spin_lock_irqsave(&qp->s_lock, flags); 80872f53af2SMike Marciniszyn if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) 80972f53af2SMike Marciniszyn goto unlock; 81072f53af2SMike Marciniszyn this_cpu_inc(*ibp->rvp.rc_qacks); 811f48ad614SDennis Dalessandro qp->s_flags |= RVT_S_ACK_PENDING | RVT_S_RESP_PENDING; 812f48ad614SDennis Dalessandro qp->s_nak_state = qp->r_nak_state; 813f48ad614SDennis Dalessandro qp->s_ack_psn = qp->r_ack_psn; 814f48ad614SDennis Dalessandro if (is_fecn) 815f48ad614SDennis Dalessandro qp->s_flags |= RVT_S_ECN; 816f48ad614SDennis Dalessandro 817ca00c62bSDennis Dalessandro /* Schedule the send engine. */ 818f48ad614SDennis Dalessandro hfi1_schedule_send(qp); 81972f53af2SMike Marciniszyn unlock: 820f48ad614SDennis Dalessandro spin_unlock_irqrestore(&qp->s_lock, flags); 821f48ad614SDennis Dalessandro } 822f48ad614SDennis Dalessandro 823f48ad614SDennis Dalessandro /** 824f48ad614SDennis Dalessandro * reset_psn - reset the QP state to send starting from PSN 825f48ad614SDennis Dalessandro * @qp: the QP 826f48ad614SDennis Dalessandro * @psn: the packet sequence number to restart at 827f48ad614SDennis Dalessandro * 828f48ad614SDennis Dalessandro * This is called from hfi1_rc_rcv() to process an incoming RC ACK 829f48ad614SDennis Dalessandro * for the given QP. 830f48ad614SDennis Dalessandro * Called at interrupt level with the QP s_lock held. 831f48ad614SDennis Dalessandro */ 832f48ad614SDennis Dalessandro static void reset_psn(struct rvt_qp *qp, u32 psn) 833f48ad614SDennis Dalessandro { 834f48ad614SDennis Dalessandro u32 n = qp->s_acked; 835f48ad614SDennis Dalessandro struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, n); 836f48ad614SDennis Dalessandro u32 opcode; 837f48ad614SDennis Dalessandro 83868e78b3dSMike Marciniszyn lockdep_assert_held(&qp->s_lock); 839f48ad614SDennis Dalessandro qp->s_cur = n; 840f48ad614SDennis Dalessandro 841f48ad614SDennis Dalessandro /* 842f48ad614SDennis Dalessandro * If we are starting the request from the beginning, 843f48ad614SDennis Dalessandro * let the normal send code handle initialization. 844f48ad614SDennis Dalessandro */ 845f48ad614SDennis Dalessandro if (cmp_psn(psn, wqe->psn) <= 0) { 846f48ad614SDennis Dalessandro qp->s_state = OP(SEND_LAST); 847f48ad614SDennis Dalessandro goto done; 848f48ad614SDennis Dalessandro } 849f48ad614SDennis Dalessandro 850f48ad614SDennis Dalessandro /* Find the work request opcode corresponding to the given PSN. */ 851f48ad614SDennis Dalessandro opcode = wqe->wr.opcode; 852f48ad614SDennis Dalessandro for (;;) { 853f48ad614SDennis Dalessandro int diff; 854f48ad614SDennis Dalessandro 855f48ad614SDennis Dalessandro if (++n == qp->s_size) 856f48ad614SDennis Dalessandro n = 0; 857f48ad614SDennis Dalessandro if (n == qp->s_tail) 858f48ad614SDennis Dalessandro break; 859f48ad614SDennis Dalessandro wqe = rvt_get_swqe_ptr(qp, n); 860f48ad614SDennis Dalessandro diff = cmp_psn(psn, wqe->psn); 861f48ad614SDennis Dalessandro if (diff < 0) 862f48ad614SDennis Dalessandro break; 863f48ad614SDennis Dalessandro qp->s_cur = n; 864f48ad614SDennis Dalessandro /* 865f48ad614SDennis Dalessandro * If we are starting the request from the beginning, 866f48ad614SDennis Dalessandro * let the normal send code handle initialization. 867f48ad614SDennis Dalessandro */ 868f48ad614SDennis Dalessandro if (diff == 0) { 869f48ad614SDennis Dalessandro qp->s_state = OP(SEND_LAST); 870f48ad614SDennis Dalessandro goto done; 871f48ad614SDennis Dalessandro } 872f48ad614SDennis Dalessandro opcode = wqe->wr.opcode; 873f48ad614SDennis Dalessandro } 874f48ad614SDennis Dalessandro 875f48ad614SDennis Dalessandro /* 876f48ad614SDennis Dalessandro * Set the state to restart in the middle of a request. 877f48ad614SDennis Dalessandro * Don't change the s_sge, s_cur_sge, or s_cur_size. 878f48ad614SDennis Dalessandro * See hfi1_make_rc_req(). 879f48ad614SDennis Dalessandro */ 880f48ad614SDennis Dalessandro switch (opcode) { 881f48ad614SDennis Dalessandro case IB_WR_SEND: 882f48ad614SDennis Dalessandro case IB_WR_SEND_WITH_IMM: 883f48ad614SDennis Dalessandro qp->s_state = OP(RDMA_READ_RESPONSE_FIRST); 884f48ad614SDennis Dalessandro break; 885f48ad614SDennis Dalessandro 886f48ad614SDennis Dalessandro case IB_WR_RDMA_WRITE: 887f48ad614SDennis Dalessandro case IB_WR_RDMA_WRITE_WITH_IMM: 888f48ad614SDennis Dalessandro qp->s_state = OP(RDMA_READ_RESPONSE_LAST); 889f48ad614SDennis Dalessandro break; 890f48ad614SDennis Dalessandro 891f48ad614SDennis Dalessandro case IB_WR_RDMA_READ: 892f48ad614SDennis Dalessandro qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE); 893f48ad614SDennis Dalessandro break; 894f48ad614SDennis Dalessandro 895f48ad614SDennis Dalessandro default: 896f48ad614SDennis Dalessandro /* 897f48ad614SDennis Dalessandro * This case shouldn't happen since its only 898f48ad614SDennis Dalessandro * one PSN per req. 899f48ad614SDennis Dalessandro */ 900f48ad614SDennis Dalessandro qp->s_state = OP(SEND_LAST); 901f48ad614SDennis Dalessandro } 902f48ad614SDennis Dalessandro done: 903f48ad614SDennis Dalessandro qp->s_psn = psn; 904f48ad614SDennis Dalessandro /* 905f48ad614SDennis Dalessandro * Set RVT_S_WAIT_PSN as rc_complete() may start the timer 906ca00c62bSDennis Dalessandro * asynchronously before the send engine can get scheduled. 907f48ad614SDennis Dalessandro * Doing it in hfi1_make_rc_req() is too late. 908f48ad614SDennis Dalessandro */ 909f48ad614SDennis Dalessandro if ((cmp_psn(qp->s_psn, qp->s_sending_hpsn) <= 0) && 910f48ad614SDennis Dalessandro (cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0)) 911f48ad614SDennis Dalessandro qp->s_flags |= RVT_S_WAIT_PSN; 912f48ad614SDennis Dalessandro qp->s_flags &= ~RVT_S_AHG_VALID; 913f48ad614SDennis Dalessandro } 914f48ad614SDennis Dalessandro 915f48ad614SDennis Dalessandro /* 916f48ad614SDennis Dalessandro * Back up requester to resend the last un-ACKed request. 917f48ad614SDennis Dalessandro * The QP r_lock and s_lock should be held and interrupts disabled. 918f48ad614SDennis Dalessandro */ 91956acbbfbSVenkata Sandeep Dhanalakota void hfi1_restart_rc(struct rvt_qp *qp, u32 psn, int wait) 920f48ad614SDennis Dalessandro { 921f48ad614SDennis Dalessandro struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, qp->s_acked); 922f48ad614SDennis Dalessandro struct hfi1_ibport *ibp; 923f48ad614SDennis Dalessandro 92468e78b3dSMike Marciniszyn lockdep_assert_held(&qp->r_lock); 92568e78b3dSMike Marciniszyn lockdep_assert_held(&qp->s_lock); 926f48ad614SDennis Dalessandro if (qp->s_retry == 0) { 927f48ad614SDennis Dalessandro if (qp->s_mig_state == IB_MIG_ARMED) { 928f48ad614SDennis Dalessandro hfi1_migrate_qp(qp); 929f48ad614SDennis Dalessandro qp->s_retry = qp->s_retry_cnt; 930f48ad614SDennis Dalessandro } else if (qp->s_last == qp->s_acked) { 931f48ad614SDennis Dalessandro hfi1_send_complete(qp, wqe, IB_WC_RETRY_EXC_ERR); 932f48ad614SDennis Dalessandro rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR); 933f48ad614SDennis Dalessandro return; 934f48ad614SDennis Dalessandro } else { /* need to handle delayed completion */ 935f48ad614SDennis Dalessandro return; 936f48ad614SDennis Dalessandro } 937f48ad614SDennis Dalessandro } else { 938f48ad614SDennis Dalessandro qp->s_retry--; 939f48ad614SDennis Dalessandro } 940f48ad614SDennis Dalessandro 941f48ad614SDennis Dalessandro ibp = to_iport(qp->ibqp.device, qp->port_num); 942f48ad614SDennis Dalessandro if (wqe->wr.opcode == IB_WR_RDMA_READ) 943f48ad614SDennis Dalessandro ibp->rvp.n_rc_resends++; 944f48ad614SDennis Dalessandro else 945f48ad614SDennis Dalessandro ibp->rvp.n_rc_resends += delta_psn(qp->s_psn, psn); 946f48ad614SDennis Dalessandro 947f48ad614SDennis Dalessandro qp->s_flags &= ~(RVT_S_WAIT_FENCE | RVT_S_WAIT_RDMAR | 948f48ad614SDennis Dalessandro RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_PSN | 949f48ad614SDennis Dalessandro RVT_S_WAIT_ACK); 950f48ad614SDennis Dalessandro if (wait) 951f48ad614SDennis Dalessandro qp->s_flags |= RVT_S_SEND_ONE; 952f48ad614SDennis Dalessandro reset_psn(qp, psn); 953f48ad614SDennis Dalessandro } 954f48ad614SDennis Dalessandro 955f48ad614SDennis Dalessandro /* 956f48ad614SDennis Dalessandro * Set qp->s_sending_psn to the next PSN after the given one. 957f48ad614SDennis Dalessandro * This would be psn+1 except when RDMA reads are present. 958f48ad614SDennis Dalessandro */ 959f48ad614SDennis Dalessandro static void reset_sending_psn(struct rvt_qp *qp, u32 psn) 960f48ad614SDennis Dalessandro { 961f48ad614SDennis Dalessandro struct rvt_swqe *wqe; 962f48ad614SDennis Dalessandro u32 n = qp->s_last; 963f48ad614SDennis Dalessandro 96468e78b3dSMike Marciniszyn lockdep_assert_held(&qp->s_lock); 965f48ad614SDennis Dalessandro /* Find the work request corresponding to the given PSN. */ 966f48ad614SDennis Dalessandro for (;;) { 967f48ad614SDennis Dalessandro wqe = rvt_get_swqe_ptr(qp, n); 968f48ad614SDennis Dalessandro if (cmp_psn(psn, wqe->lpsn) <= 0) { 969f48ad614SDennis Dalessandro if (wqe->wr.opcode == IB_WR_RDMA_READ) 970f48ad614SDennis Dalessandro qp->s_sending_psn = wqe->lpsn + 1; 971f48ad614SDennis Dalessandro else 972f48ad614SDennis Dalessandro qp->s_sending_psn = psn + 1; 973f48ad614SDennis Dalessandro break; 974f48ad614SDennis Dalessandro } 975f48ad614SDennis Dalessandro if (++n == qp->s_size) 976f48ad614SDennis Dalessandro n = 0; 977f48ad614SDennis Dalessandro if (n == qp->s_tail) 978f48ad614SDennis Dalessandro break; 979f48ad614SDennis Dalessandro } 980f48ad614SDennis Dalessandro } 981f48ad614SDennis Dalessandro 982f48ad614SDennis Dalessandro /* 983f48ad614SDennis Dalessandro * This should be called with the QP s_lock held and interrupts disabled. 984f48ad614SDennis Dalessandro */ 985261a4351SMike Marciniszyn void hfi1_rc_send_complete(struct rvt_qp *qp, struct ib_header *hdr) 986f48ad614SDennis Dalessandro { 987261a4351SMike Marciniszyn struct ib_other_headers *ohdr; 988f48ad614SDennis Dalessandro struct rvt_swqe *wqe; 989f48ad614SDennis Dalessandro u32 opcode; 990f48ad614SDennis Dalessandro u32 psn; 991f48ad614SDennis Dalessandro 99268e78b3dSMike Marciniszyn lockdep_assert_held(&qp->s_lock); 993f48ad614SDennis Dalessandro if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_OR_FLUSH_SEND)) 994f48ad614SDennis Dalessandro return; 995f48ad614SDennis Dalessandro 996f48ad614SDennis Dalessandro /* Find out where the BTH is */ 997f48ad614SDennis Dalessandro if ((be16_to_cpu(hdr->lrh[0]) & 3) == HFI1_LRH_BTH) 998f48ad614SDennis Dalessandro ohdr = &hdr->u.oth; 999f48ad614SDennis Dalessandro else 1000f48ad614SDennis Dalessandro ohdr = &hdr->u.l.oth; 1001f48ad614SDennis Dalessandro 1002f48ad614SDennis Dalessandro opcode = be32_to_cpu(ohdr->bth[0]) >> 24; 1003f48ad614SDennis Dalessandro if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) && 1004f48ad614SDennis Dalessandro opcode <= OP(ATOMIC_ACKNOWLEDGE)) { 1005f48ad614SDennis Dalessandro WARN_ON(!qp->s_rdma_ack_cnt); 1006f48ad614SDennis Dalessandro qp->s_rdma_ack_cnt--; 1007f48ad614SDennis Dalessandro return; 1008f48ad614SDennis Dalessandro } 1009f48ad614SDennis Dalessandro 1010f48ad614SDennis Dalessandro psn = be32_to_cpu(ohdr->bth[2]); 1011f48ad614SDennis Dalessandro reset_sending_psn(qp, psn); 1012f48ad614SDennis Dalessandro 1013f48ad614SDennis Dalessandro /* 1014f48ad614SDennis Dalessandro * Start timer after a packet requesting an ACK has been sent and 1015f48ad614SDennis Dalessandro * there are still requests that haven't been acked. 1016f48ad614SDennis Dalessandro */ 1017f48ad614SDennis Dalessandro if ((psn & IB_BTH_REQ_ACK) && qp->s_acked != qp->s_tail && 1018f48ad614SDennis Dalessandro !(qp->s_flags & 1019f48ad614SDennis Dalessandro (RVT_S_TIMER | RVT_S_WAIT_RNR | RVT_S_WAIT_PSN)) && 1020f48ad614SDennis Dalessandro (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) 102156acbbfbSVenkata Sandeep Dhanalakota rvt_add_retry_timer(qp); 1022f48ad614SDennis Dalessandro 1023f48ad614SDennis Dalessandro while (qp->s_last != qp->s_acked) { 1024f48ad614SDennis Dalessandro u32 s_last; 1025f48ad614SDennis Dalessandro 1026f48ad614SDennis Dalessandro wqe = rvt_get_swqe_ptr(qp, qp->s_last); 1027f48ad614SDennis Dalessandro if (cmp_psn(wqe->lpsn, qp->s_sending_psn) >= 0 && 1028f48ad614SDennis Dalessandro cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) 1029f48ad614SDennis Dalessandro break; 1030f48ad614SDennis Dalessandro s_last = qp->s_last; 1031f48ad614SDennis Dalessandro if (++s_last >= qp->s_size) 1032f48ad614SDennis Dalessandro s_last = 0; 1033f48ad614SDennis Dalessandro qp->s_last = s_last; 1034f48ad614SDennis Dalessandro /* see post_send() */ 1035f48ad614SDennis Dalessandro barrier(); 1036c64607aaSMike Marciniszyn rvt_put_swqe(wqe); 10370771da5aSMike Marciniszyn rvt_qp_swqe_complete(qp, wqe, IB_WC_SUCCESS); 1038f48ad614SDennis Dalessandro } 1039f48ad614SDennis Dalessandro /* 1040f48ad614SDennis Dalessandro * If we were waiting for sends to complete before re-sending, 1041f48ad614SDennis Dalessandro * and they are now complete, restart sending. 1042f48ad614SDennis Dalessandro */ 1043462b6b21SSebastian Sanchez trace_hfi1_sendcomplete(qp, psn); 1044f48ad614SDennis Dalessandro if (qp->s_flags & RVT_S_WAIT_PSN && 1045f48ad614SDennis Dalessandro cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) > 0) { 1046f48ad614SDennis Dalessandro qp->s_flags &= ~RVT_S_WAIT_PSN; 1047f48ad614SDennis Dalessandro qp->s_sending_psn = qp->s_psn; 1048f48ad614SDennis Dalessandro qp->s_sending_hpsn = qp->s_psn - 1; 1049f48ad614SDennis Dalessandro hfi1_schedule_send(qp); 1050f48ad614SDennis Dalessandro } 1051f48ad614SDennis Dalessandro } 1052f48ad614SDennis Dalessandro 1053f48ad614SDennis Dalessandro static inline void update_last_psn(struct rvt_qp *qp, u32 psn) 1054f48ad614SDennis Dalessandro { 1055f48ad614SDennis Dalessandro qp->s_last_psn = psn; 1056f48ad614SDennis Dalessandro } 1057f48ad614SDennis Dalessandro 1058f48ad614SDennis Dalessandro /* 1059f48ad614SDennis Dalessandro * Generate a SWQE completion. 1060f48ad614SDennis Dalessandro * This is similar to hfi1_send_complete but has to check to be sure 1061f48ad614SDennis Dalessandro * that the SGEs are not being referenced if the SWQE is being resent. 1062f48ad614SDennis Dalessandro */ 1063f48ad614SDennis Dalessandro static struct rvt_swqe *do_rc_completion(struct rvt_qp *qp, 1064f48ad614SDennis Dalessandro struct rvt_swqe *wqe, 1065f48ad614SDennis Dalessandro struct hfi1_ibport *ibp) 1066f48ad614SDennis Dalessandro { 106768e78b3dSMike Marciniszyn lockdep_assert_held(&qp->s_lock); 1068f48ad614SDennis Dalessandro /* 1069f48ad614SDennis Dalessandro * Don't decrement refcount and don't generate a 1070f48ad614SDennis Dalessandro * completion if the SWQE is being resent until the send 1071f48ad614SDennis Dalessandro * is finished. 1072f48ad614SDennis Dalessandro */ 1073f48ad614SDennis Dalessandro if (cmp_psn(wqe->lpsn, qp->s_sending_psn) < 0 || 1074f48ad614SDennis Dalessandro cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) > 0) { 1075f48ad614SDennis Dalessandro u32 s_last; 1076f48ad614SDennis Dalessandro 1077c64607aaSMike Marciniszyn rvt_put_swqe(wqe); 1078f48ad614SDennis Dalessandro s_last = qp->s_last; 1079f48ad614SDennis Dalessandro if (++s_last >= qp->s_size) 1080f48ad614SDennis Dalessandro s_last = 0; 1081f48ad614SDennis Dalessandro qp->s_last = s_last; 1082f48ad614SDennis Dalessandro /* see post_send() */ 1083f48ad614SDennis Dalessandro barrier(); 10840771da5aSMike Marciniszyn rvt_qp_swqe_complete(qp, wqe, IB_WC_SUCCESS); 1085f48ad614SDennis Dalessandro } else { 1086f48ad614SDennis Dalessandro struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); 1087f48ad614SDennis Dalessandro 1088f48ad614SDennis Dalessandro this_cpu_inc(*ibp->rvp.rc_delayed_comp); 1089f48ad614SDennis Dalessandro /* 1090f48ad614SDennis Dalessandro * If send progress not running attempt to progress 1091f48ad614SDennis Dalessandro * SDMA queue. 1092f48ad614SDennis Dalessandro */ 1093f48ad614SDennis Dalessandro if (ppd->dd->flags & HFI1_HAS_SEND_DMA) { 1094f48ad614SDennis Dalessandro struct sdma_engine *engine; 1095f48ad614SDennis Dalessandro u8 sc5; 1096f48ad614SDennis Dalessandro 1097f48ad614SDennis Dalessandro /* For now use sc to find engine */ 1098f48ad614SDennis Dalessandro sc5 = ibp->sl_to_sc[qp->remote_ah_attr.sl]; 1099f48ad614SDennis Dalessandro engine = qp_to_sdma_engine(qp, sc5); 1100f48ad614SDennis Dalessandro sdma_engine_progress_schedule(engine); 1101f48ad614SDennis Dalessandro } 1102f48ad614SDennis Dalessandro } 1103f48ad614SDennis Dalessandro 1104f48ad614SDennis Dalessandro qp->s_retry = qp->s_retry_cnt; 1105f48ad614SDennis Dalessandro update_last_psn(qp, wqe->lpsn); 1106f48ad614SDennis Dalessandro 1107f48ad614SDennis Dalessandro /* 1108f48ad614SDennis Dalessandro * If we are completing a request which is in the process of 1109f48ad614SDennis Dalessandro * being resent, we can stop re-sending it since we know the 1110f48ad614SDennis Dalessandro * responder has already seen it. 1111f48ad614SDennis Dalessandro */ 1112f48ad614SDennis Dalessandro if (qp->s_acked == qp->s_cur) { 1113f48ad614SDennis Dalessandro if (++qp->s_cur >= qp->s_size) 1114f48ad614SDennis Dalessandro qp->s_cur = 0; 1115f48ad614SDennis Dalessandro qp->s_acked = qp->s_cur; 1116f48ad614SDennis Dalessandro wqe = rvt_get_swqe_ptr(qp, qp->s_cur); 1117f48ad614SDennis Dalessandro if (qp->s_acked != qp->s_tail) { 1118f48ad614SDennis Dalessandro qp->s_state = OP(SEND_LAST); 1119f48ad614SDennis Dalessandro qp->s_psn = wqe->psn; 1120f48ad614SDennis Dalessandro } 1121f48ad614SDennis Dalessandro } else { 1122f48ad614SDennis Dalessandro if (++qp->s_acked >= qp->s_size) 1123f48ad614SDennis Dalessandro qp->s_acked = 0; 1124f48ad614SDennis Dalessandro if (qp->state == IB_QPS_SQD && qp->s_acked == qp->s_cur) 1125f48ad614SDennis Dalessandro qp->s_draining = 0; 1126f48ad614SDennis Dalessandro wqe = rvt_get_swqe_ptr(qp, qp->s_acked); 1127f48ad614SDennis Dalessandro } 1128f48ad614SDennis Dalessandro return wqe; 1129f48ad614SDennis Dalessandro } 1130f48ad614SDennis Dalessandro 1131f48ad614SDennis Dalessandro /** 1132f48ad614SDennis Dalessandro * do_rc_ack - process an incoming RC ACK 1133f48ad614SDennis Dalessandro * @qp: the QP the ACK came in on 1134f48ad614SDennis Dalessandro * @psn: the packet sequence number of the ACK 1135f48ad614SDennis Dalessandro * @opcode: the opcode of the request that resulted in the ACK 1136f48ad614SDennis Dalessandro * 1137f48ad614SDennis Dalessandro * This is called from rc_rcv_resp() to process an incoming RC ACK 1138f48ad614SDennis Dalessandro * for the given QP. 1139f48ad614SDennis Dalessandro * May be called at interrupt level, with the QP s_lock held. 1140f48ad614SDennis Dalessandro * Returns 1 if OK, 0 if current operation should be aborted (NAK). 1141f48ad614SDennis Dalessandro */ 1142f48ad614SDennis Dalessandro static int do_rc_ack(struct rvt_qp *qp, u32 aeth, u32 psn, int opcode, 1143f48ad614SDennis Dalessandro u64 val, struct hfi1_ctxtdata *rcd) 1144f48ad614SDennis Dalessandro { 1145f48ad614SDennis Dalessandro struct hfi1_ibport *ibp; 1146f48ad614SDennis Dalessandro enum ib_wc_status status; 1147f48ad614SDennis Dalessandro struct rvt_swqe *wqe; 1148f48ad614SDennis Dalessandro int ret = 0; 1149f48ad614SDennis Dalessandro u32 ack_psn; 1150f48ad614SDennis Dalessandro int diff; 1151f48ad614SDennis Dalessandro 115268e78b3dSMike Marciniszyn lockdep_assert_held(&qp->s_lock); 1153f48ad614SDennis Dalessandro /* 1154f48ad614SDennis Dalessandro * Note that NAKs implicitly ACK outstanding SEND and RDMA write 1155f48ad614SDennis Dalessandro * requests and implicitly NAK RDMA read and atomic requests issued 1156f48ad614SDennis Dalessandro * before the NAK'ed request. The MSN won't include the NAK'ed 1157f48ad614SDennis Dalessandro * request but will include an ACK'ed request(s). 1158f48ad614SDennis Dalessandro */ 1159f48ad614SDennis Dalessandro ack_psn = psn; 1160696513e8SBrian Welty if (aeth >> RVT_AETH_NAK_SHIFT) 1161f48ad614SDennis Dalessandro ack_psn--; 1162f48ad614SDennis Dalessandro wqe = rvt_get_swqe_ptr(qp, qp->s_acked); 1163f3e862cbSSebastian Sanchez ibp = rcd_to_iport(rcd); 1164f48ad614SDennis Dalessandro 1165f48ad614SDennis Dalessandro /* 1166f48ad614SDennis Dalessandro * The MSN might be for a later WQE than the PSN indicates so 1167f48ad614SDennis Dalessandro * only complete WQEs that the PSN finishes. 1168f48ad614SDennis Dalessandro */ 1169f48ad614SDennis Dalessandro while ((diff = delta_psn(ack_psn, wqe->lpsn)) >= 0) { 1170f48ad614SDennis Dalessandro /* 1171f48ad614SDennis Dalessandro * RDMA_READ_RESPONSE_ONLY is a special case since 1172f48ad614SDennis Dalessandro * we want to generate completion events for everything 1173f48ad614SDennis Dalessandro * before the RDMA read, copy the data, then generate 1174f48ad614SDennis Dalessandro * the completion for the read. 1175f48ad614SDennis Dalessandro */ 1176f48ad614SDennis Dalessandro if (wqe->wr.opcode == IB_WR_RDMA_READ && 1177f48ad614SDennis Dalessandro opcode == OP(RDMA_READ_RESPONSE_ONLY) && 1178f48ad614SDennis Dalessandro diff == 0) { 1179f48ad614SDennis Dalessandro ret = 1; 1180f48ad614SDennis Dalessandro goto bail_stop; 1181f48ad614SDennis Dalessandro } 1182f48ad614SDennis Dalessandro /* 1183f48ad614SDennis Dalessandro * If this request is a RDMA read or atomic, and the ACK is 1184f48ad614SDennis Dalessandro * for a later operation, this ACK NAKs the RDMA read or 1185f48ad614SDennis Dalessandro * atomic. In other words, only a RDMA_READ_LAST or ONLY 1186f48ad614SDennis Dalessandro * can ACK a RDMA read and likewise for atomic ops. Note 1187f48ad614SDennis Dalessandro * that the NAK case can only happen if relaxed ordering is 1188f48ad614SDennis Dalessandro * used and requests are sent after an RDMA read or atomic 1189f48ad614SDennis Dalessandro * is sent but before the response is received. 1190f48ad614SDennis Dalessandro */ 1191f48ad614SDennis Dalessandro if ((wqe->wr.opcode == IB_WR_RDMA_READ && 1192f48ad614SDennis Dalessandro (opcode != OP(RDMA_READ_RESPONSE_LAST) || diff != 0)) || 1193f48ad614SDennis Dalessandro ((wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || 1194f48ad614SDennis Dalessandro wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) && 1195f48ad614SDennis Dalessandro (opcode != OP(ATOMIC_ACKNOWLEDGE) || diff != 0))) { 1196f48ad614SDennis Dalessandro /* Retry this request. */ 1197f48ad614SDennis Dalessandro if (!(qp->r_flags & RVT_R_RDMAR_SEQ)) { 1198f48ad614SDennis Dalessandro qp->r_flags |= RVT_R_RDMAR_SEQ; 119956acbbfbSVenkata Sandeep Dhanalakota hfi1_restart_rc(qp, qp->s_last_psn + 1, 0); 1200f48ad614SDennis Dalessandro if (list_empty(&qp->rspwait)) { 1201f48ad614SDennis Dalessandro qp->r_flags |= RVT_R_RSP_SEND; 12024d6f85c3SMike Marciniszyn rvt_get_qp(qp); 1203f48ad614SDennis Dalessandro list_add_tail(&qp->rspwait, 1204f48ad614SDennis Dalessandro &rcd->qp_wait_list); 1205f48ad614SDennis Dalessandro } 1206f48ad614SDennis Dalessandro } 1207f48ad614SDennis Dalessandro /* 1208f48ad614SDennis Dalessandro * No need to process the ACK/NAK since we are 1209f48ad614SDennis Dalessandro * restarting an earlier request. 1210f48ad614SDennis Dalessandro */ 1211f48ad614SDennis Dalessandro goto bail_stop; 1212f48ad614SDennis Dalessandro } 1213f48ad614SDennis Dalessandro if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || 1214f48ad614SDennis Dalessandro wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) { 1215f48ad614SDennis Dalessandro u64 *vaddr = wqe->sg_list[0].vaddr; 1216f48ad614SDennis Dalessandro *vaddr = val; 1217f48ad614SDennis Dalessandro } 1218f48ad614SDennis Dalessandro if (qp->s_num_rd_atomic && 1219f48ad614SDennis Dalessandro (wqe->wr.opcode == IB_WR_RDMA_READ || 1220f48ad614SDennis Dalessandro wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || 1221f48ad614SDennis Dalessandro wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)) { 1222f48ad614SDennis Dalessandro qp->s_num_rd_atomic--; 1223f48ad614SDennis Dalessandro /* Restart sending task if fence is complete */ 1224f48ad614SDennis Dalessandro if ((qp->s_flags & RVT_S_WAIT_FENCE) && 1225f48ad614SDennis Dalessandro !qp->s_num_rd_atomic) { 1226f48ad614SDennis Dalessandro qp->s_flags &= ~(RVT_S_WAIT_FENCE | 1227f48ad614SDennis Dalessandro RVT_S_WAIT_ACK); 1228f48ad614SDennis Dalessandro hfi1_schedule_send(qp); 1229f48ad614SDennis Dalessandro } else if (qp->s_flags & RVT_S_WAIT_RDMAR) { 1230f48ad614SDennis Dalessandro qp->s_flags &= ~(RVT_S_WAIT_RDMAR | 1231f48ad614SDennis Dalessandro RVT_S_WAIT_ACK); 1232f48ad614SDennis Dalessandro hfi1_schedule_send(qp); 1233f48ad614SDennis Dalessandro } 1234f48ad614SDennis Dalessandro } 1235f48ad614SDennis Dalessandro wqe = do_rc_completion(qp, wqe, ibp); 1236f48ad614SDennis Dalessandro if (qp->s_acked == qp->s_tail) 1237f48ad614SDennis Dalessandro break; 1238f48ad614SDennis Dalessandro } 1239f48ad614SDennis Dalessandro 1240696513e8SBrian Welty switch (aeth >> RVT_AETH_NAK_SHIFT) { 1241f48ad614SDennis Dalessandro case 0: /* ACK */ 1242f48ad614SDennis Dalessandro this_cpu_inc(*ibp->rvp.rc_acks); 1243f48ad614SDennis Dalessandro if (qp->s_acked != qp->s_tail) { 1244f48ad614SDennis Dalessandro /* 1245f48ad614SDennis Dalessandro * We are expecting more ACKs so 1246f48ad614SDennis Dalessandro * mod the retry timer. 1247f48ad614SDennis Dalessandro */ 124856acbbfbSVenkata Sandeep Dhanalakota rvt_mod_retry_timer(qp); 1249f48ad614SDennis Dalessandro /* 1250f48ad614SDennis Dalessandro * We can stop re-sending the earlier packets and 1251f48ad614SDennis Dalessandro * continue with the next packet the receiver wants. 1252f48ad614SDennis Dalessandro */ 1253f48ad614SDennis Dalessandro if (cmp_psn(qp->s_psn, psn) <= 0) 1254f48ad614SDennis Dalessandro reset_psn(qp, psn + 1); 1255f48ad614SDennis Dalessandro } else { 1256f48ad614SDennis Dalessandro /* No more acks - kill all timers */ 125756acbbfbSVenkata Sandeep Dhanalakota rvt_stop_rc_timers(qp); 1258f48ad614SDennis Dalessandro if (cmp_psn(qp->s_psn, psn) <= 0) { 1259f48ad614SDennis Dalessandro qp->s_state = OP(SEND_LAST); 1260f48ad614SDennis Dalessandro qp->s_psn = psn + 1; 1261f48ad614SDennis Dalessandro } 1262f48ad614SDennis Dalessandro } 1263f48ad614SDennis Dalessandro if (qp->s_flags & RVT_S_WAIT_ACK) { 1264f48ad614SDennis Dalessandro qp->s_flags &= ~RVT_S_WAIT_ACK; 1265f48ad614SDennis Dalessandro hfi1_schedule_send(qp); 1266f48ad614SDennis Dalessandro } 1267696513e8SBrian Welty rvt_get_credit(qp, aeth); 1268f48ad614SDennis Dalessandro qp->s_rnr_retry = qp->s_rnr_retry_cnt; 1269f48ad614SDennis Dalessandro qp->s_retry = qp->s_retry_cnt; 1270f48ad614SDennis Dalessandro update_last_psn(qp, psn); 1271f48ad614SDennis Dalessandro return 1; 1272f48ad614SDennis Dalessandro 1273f48ad614SDennis Dalessandro case 1: /* RNR NAK */ 1274f48ad614SDennis Dalessandro ibp->rvp.n_rnr_naks++; 1275f48ad614SDennis Dalessandro if (qp->s_acked == qp->s_tail) 1276f48ad614SDennis Dalessandro goto bail_stop; 1277f48ad614SDennis Dalessandro if (qp->s_flags & RVT_S_WAIT_RNR) 1278f48ad614SDennis Dalessandro goto bail_stop; 1279f48ad614SDennis Dalessandro if (qp->s_rnr_retry == 0) { 1280f48ad614SDennis Dalessandro status = IB_WC_RNR_RETRY_EXC_ERR; 1281f48ad614SDennis Dalessandro goto class_b; 1282f48ad614SDennis Dalessandro } 1283f48ad614SDennis Dalessandro if (qp->s_rnr_retry_cnt < 7) 1284f48ad614SDennis Dalessandro qp->s_rnr_retry--; 1285f48ad614SDennis Dalessandro 1286f48ad614SDennis Dalessandro /* The last valid PSN is the previous PSN. */ 1287f48ad614SDennis Dalessandro update_last_psn(qp, psn - 1); 1288f48ad614SDennis Dalessandro 1289f48ad614SDennis Dalessandro ibp->rvp.n_rc_resends += delta_psn(qp->s_psn, psn); 1290f48ad614SDennis Dalessandro 1291f48ad614SDennis Dalessandro reset_psn(qp, psn); 1292f48ad614SDennis Dalessandro 1293f48ad614SDennis Dalessandro qp->s_flags &= ~(RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_ACK); 129456acbbfbSVenkata Sandeep Dhanalakota rvt_stop_rc_timers(qp); 129556acbbfbSVenkata Sandeep Dhanalakota rvt_add_rnr_timer(qp, aeth); 1296f48ad614SDennis Dalessandro return 0; 1297f48ad614SDennis Dalessandro 1298f48ad614SDennis Dalessandro case 3: /* NAK */ 1299f48ad614SDennis Dalessandro if (qp->s_acked == qp->s_tail) 1300f48ad614SDennis Dalessandro goto bail_stop; 1301f48ad614SDennis Dalessandro /* The last valid PSN is the previous PSN. */ 1302f48ad614SDennis Dalessandro update_last_psn(qp, psn - 1); 1303696513e8SBrian Welty switch ((aeth >> RVT_AETH_CREDIT_SHIFT) & 1304696513e8SBrian Welty RVT_AETH_CREDIT_MASK) { 1305f48ad614SDennis Dalessandro case 0: /* PSN sequence error */ 1306f48ad614SDennis Dalessandro ibp->rvp.n_seq_naks++; 1307f48ad614SDennis Dalessandro /* 1308f48ad614SDennis Dalessandro * Back up to the responder's expected PSN. 1309f48ad614SDennis Dalessandro * Note that we might get a NAK in the middle of an 1310f48ad614SDennis Dalessandro * RDMA READ response which terminates the RDMA 1311f48ad614SDennis Dalessandro * READ. 1312f48ad614SDennis Dalessandro */ 131356acbbfbSVenkata Sandeep Dhanalakota hfi1_restart_rc(qp, psn, 0); 1314f48ad614SDennis Dalessandro hfi1_schedule_send(qp); 1315f48ad614SDennis Dalessandro break; 1316f48ad614SDennis Dalessandro 1317f48ad614SDennis Dalessandro case 1: /* Invalid Request */ 1318f48ad614SDennis Dalessandro status = IB_WC_REM_INV_REQ_ERR; 1319f48ad614SDennis Dalessandro ibp->rvp.n_other_naks++; 1320f48ad614SDennis Dalessandro goto class_b; 1321f48ad614SDennis Dalessandro 1322f48ad614SDennis Dalessandro case 2: /* Remote Access Error */ 1323f48ad614SDennis Dalessandro status = IB_WC_REM_ACCESS_ERR; 1324f48ad614SDennis Dalessandro ibp->rvp.n_other_naks++; 1325f48ad614SDennis Dalessandro goto class_b; 1326f48ad614SDennis Dalessandro 1327f48ad614SDennis Dalessandro case 3: /* Remote Operation Error */ 1328f48ad614SDennis Dalessandro status = IB_WC_REM_OP_ERR; 1329f48ad614SDennis Dalessandro ibp->rvp.n_other_naks++; 1330f48ad614SDennis Dalessandro class_b: 1331f48ad614SDennis Dalessandro if (qp->s_last == qp->s_acked) { 1332f48ad614SDennis Dalessandro hfi1_send_complete(qp, wqe, status); 1333f48ad614SDennis Dalessandro rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR); 1334f48ad614SDennis Dalessandro } 1335f48ad614SDennis Dalessandro break; 1336f48ad614SDennis Dalessandro 1337f48ad614SDennis Dalessandro default: 1338f48ad614SDennis Dalessandro /* Ignore other reserved NAK error codes */ 1339f48ad614SDennis Dalessandro goto reserved; 1340f48ad614SDennis Dalessandro } 1341f48ad614SDennis Dalessandro qp->s_retry = qp->s_retry_cnt; 1342f48ad614SDennis Dalessandro qp->s_rnr_retry = qp->s_rnr_retry_cnt; 1343f48ad614SDennis Dalessandro goto bail_stop; 1344f48ad614SDennis Dalessandro 1345f48ad614SDennis Dalessandro default: /* 2: reserved */ 1346f48ad614SDennis Dalessandro reserved: 1347f48ad614SDennis Dalessandro /* Ignore reserved NAK codes. */ 1348f48ad614SDennis Dalessandro goto bail_stop; 1349f48ad614SDennis Dalessandro } 1350f48ad614SDennis Dalessandro /* cannot be reached */ 1351f48ad614SDennis Dalessandro bail_stop: 135256acbbfbSVenkata Sandeep Dhanalakota rvt_stop_rc_timers(qp); 1353f48ad614SDennis Dalessandro return ret; 1354f48ad614SDennis Dalessandro } 1355f48ad614SDennis Dalessandro 1356f48ad614SDennis Dalessandro /* 1357f48ad614SDennis Dalessandro * We have seen an out of sequence RDMA read middle or last packet. 1358f48ad614SDennis Dalessandro * This ACKs SENDs and RDMA writes up to the first RDMA read or atomic SWQE. 1359f48ad614SDennis Dalessandro */ 1360f48ad614SDennis Dalessandro static void rdma_seq_err(struct rvt_qp *qp, struct hfi1_ibport *ibp, u32 psn, 1361f48ad614SDennis Dalessandro struct hfi1_ctxtdata *rcd) 1362f48ad614SDennis Dalessandro { 1363f48ad614SDennis Dalessandro struct rvt_swqe *wqe; 1364f48ad614SDennis Dalessandro 136568e78b3dSMike Marciniszyn lockdep_assert_held(&qp->s_lock); 1366f48ad614SDennis Dalessandro /* Remove QP from retry timer */ 136756acbbfbSVenkata Sandeep Dhanalakota rvt_stop_rc_timers(qp); 1368f48ad614SDennis Dalessandro 1369f48ad614SDennis Dalessandro wqe = rvt_get_swqe_ptr(qp, qp->s_acked); 1370f48ad614SDennis Dalessandro 1371f48ad614SDennis Dalessandro while (cmp_psn(psn, wqe->lpsn) > 0) { 1372f48ad614SDennis Dalessandro if (wqe->wr.opcode == IB_WR_RDMA_READ || 1373f48ad614SDennis Dalessandro wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || 1374f48ad614SDennis Dalessandro wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) 1375f48ad614SDennis Dalessandro break; 1376f48ad614SDennis Dalessandro wqe = do_rc_completion(qp, wqe, ibp); 1377f48ad614SDennis Dalessandro } 1378f48ad614SDennis Dalessandro 1379f48ad614SDennis Dalessandro ibp->rvp.n_rdma_seq++; 1380f48ad614SDennis Dalessandro qp->r_flags |= RVT_R_RDMAR_SEQ; 138156acbbfbSVenkata Sandeep Dhanalakota hfi1_restart_rc(qp, qp->s_last_psn + 1, 0); 1382f48ad614SDennis Dalessandro if (list_empty(&qp->rspwait)) { 1383f48ad614SDennis Dalessandro qp->r_flags |= RVT_R_RSP_SEND; 13844d6f85c3SMike Marciniszyn rvt_get_qp(qp); 1385f48ad614SDennis Dalessandro list_add_tail(&qp->rspwait, &rcd->qp_wait_list); 1386f48ad614SDennis Dalessandro } 1387f48ad614SDennis Dalessandro } 1388f48ad614SDennis Dalessandro 1389f48ad614SDennis Dalessandro /** 1390f48ad614SDennis Dalessandro * rc_rcv_resp - process an incoming RC response packet 1391f48ad614SDennis Dalessandro * @ibp: the port this packet came in on 1392f48ad614SDennis Dalessandro * @ohdr: the other headers for this packet 1393f48ad614SDennis Dalessandro * @data: the packet data 1394f48ad614SDennis Dalessandro * @tlen: the packet length 1395f48ad614SDennis Dalessandro * @qp: the QP for this packet 1396f48ad614SDennis Dalessandro * @opcode: the opcode for this packet 1397f48ad614SDennis Dalessandro * @psn: the packet sequence number for this packet 1398f48ad614SDennis Dalessandro * @hdrsize: the header length 1399f48ad614SDennis Dalessandro * @pmtu: the path MTU 1400f48ad614SDennis Dalessandro * 1401f48ad614SDennis Dalessandro * This is called from hfi1_rc_rcv() to process an incoming RC response 1402f48ad614SDennis Dalessandro * packet for the given QP. 1403f48ad614SDennis Dalessandro * Called at interrupt level. 1404f48ad614SDennis Dalessandro */ 1405f48ad614SDennis Dalessandro static void rc_rcv_resp(struct hfi1_ibport *ibp, 1406261a4351SMike Marciniszyn struct ib_other_headers *ohdr, 1407f48ad614SDennis Dalessandro void *data, u32 tlen, struct rvt_qp *qp, 1408f48ad614SDennis Dalessandro u32 opcode, u32 psn, u32 hdrsize, u32 pmtu, 1409f48ad614SDennis Dalessandro struct hfi1_ctxtdata *rcd) 1410f48ad614SDennis Dalessandro { 1411f48ad614SDennis Dalessandro struct rvt_swqe *wqe; 1412f48ad614SDennis Dalessandro enum ib_wc_status status; 1413f48ad614SDennis Dalessandro unsigned long flags; 1414f48ad614SDennis Dalessandro int diff; 1415f48ad614SDennis Dalessandro u32 pad; 1416f48ad614SDennis Dalessandro u32 aeth; 1417f48ad614SDennis Dalessandro u64 val; 1418f48ad614SDennis Dalessandro 1419f48ad614SDennis Dalessandro spin_lock_irqsave(&qp->s_lock, flags); 1420f48ad614SDennis Dalessandro 1421462b6b21SSebastian Sanchez trace_hfi1_ack(qp, psn); 1422f48ad614SDennis Dalessandro 1423f48ad614SDennis Dalessandro /* Ignore invalid responses. */ 1424f48ad614SDennis Dalessandro smp_read_barrier_depends(); /* see post_one_send */ 1425eb04ff09SMike Marciniszyn if (cmp_psn(psn, READ_ONCE(qp->s_next_psn)) >= 0) 1426f48ad614SDennis Dalessandro goto ack_done; 1427f48ad614SDennis Dalessandro 1428f48ad614SDennis Dalessandro /* Ignore duplicate responses. */ 1429f48ad614SDennis Dalessandro diff = cmp_psn(psn, qp->s_last_psn); 1430f48ad614SDennis Dalessandro if (unlikely(diff <= 0)) { 1431f48ad614SDennis Dalessandro /* Update credits for "ghost" ACKs */ 1432f48ad614SDennis Dalessandro if (diff == 0 && opcode == OP(ACKNOWLEDGE)) { 1433f48ad614SDennis Dalessandro aeth = be32_to_cpu(ohdr->u.aeth); 1434696513e8SBrian Welty if ((aeth >> RVT_AETH_NAK_SHIFT) == 0) 1435696513e8SBrian Welty rvt_get_credit(qp, aeth); 1436f48ad614SDennis Dalessandro } 1437f48ad614SDennis Dalessandro goto ack_done; 1438f48ad614SDennis Dalessandro } 1439f48ad614SDennis Dalessandro 1440f48ad614SDennis Dalessandro /* 1441f48ad614SDennis Dalessandro * Skip everything other than the PSN we expect, if we are waiting 1442f48ad614SDennis Dalessandro * for a reply to a restarted RDMA read or atomic op. 1443f48ad614SDennis Dalessandro */ 1444f48ad614SDennis Dalessandro if (qp->r_flags & RVT_R_RDMAR_SEQ) { 1445f48ad614SDennis Dalessandro if (cmp_psn(psn, qp->s_last_psn + 1) != 0) 1446f48ad614SDennis Dalessandro goto ack_done; 1447f48ad614SDennis Dalessandro qp->r_flags &= ~RVT_R_RDMAR_SEQ; 1448f48ad614SDennis Dalessandro } 1449f48ad614SDennis Dalessandro 1450f48ad614SDennis Dalessandro if (unlikely(qp->s_acked == qp->s_tail)) 1451f48ad614SDennis Dalessandro goto ack_done; 1452f48ad614SDennis Dalessandro wqe = rvt_get_swqe_ptr(qp, qp->s_acked); 1453f48ad614SDennis Dalessandro status = IB_WC_SUCCESS; 1454f48ad614SDennis Dalessandro 1455f48ad614SDennis Dalessandro switch (opcode) { 1456f48ad614SDennis Dalessandro case OP(ACKNOWLEDGE): 1457f48ad614SDennis Dalessandro case OP(ATOMIC_ACKNOWLEDGE): 1458f48ad614SDennis Dalessandro case OP(RDMA_READ_RESPONSE_FIRST): 1459f48ad614SDennis Dalessandro aeth = be32_to_cpu(ohdr->u.aeth); 1460261a4351SMike Marciniszyn if (opcode == OP(ATOMIC_ACKNOWLEDGE)) 1461261a4351SMike Marciniszyn val = ib_u64_get(&ohdr->u.at.atomic_ack_eth); 1462261a4351SMike Marciniszyn else 1463f48ad614SDennis Dalessandro val = 0; 1464f48ad614SDennis Dalessandro if (!do_rc_ack(qp, aeth, psn, opcode, val, rcd) || 1465f48ad614SDennis Dalessandro opcode != OP(RDMA_READ_RESPONSE_FIRST)) 1466f48ad614SDennis Dalessandro goto ack_done; 1467f48ad614SDennis Dalessandro wqe = rvt_get_swqe_ptr(qp, qp->s_acked); 1468f48ad614SDennis Dalessandro if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) 1469f48ad614SDennis Dalessandro goto ack_op_err; 1470f48ad614SDennis Dalessandro /* 1471f48ad614SDennis Dalessandro * If this is a response to a resent RDMA read, we 1472f48ad614SDennis Dalessandro * have to be careful to copy the data to the right 1473f48ad614SDennis Dalessandro * location. 1474f48ad614SDennis Dalessandro */ 1475f48ad614SDennis Dalessandro qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, 1476f48ad614SDennis Dalessandro wqe, psn, pmtu); 1477f48ad614SDennis Dalessandro goto read_middle; 1478f48ad614SDennis Dalessandro 1479f48ad614SDennis Dalessandro case OP(RDMA_READ_RESPONSE_MIDDLE): 1480f48ad614SDennis Dalessandro /* no AETH, no ACK */ 1481f48ad614SDennis Dalessandro if (unlikely(cmp_psn(psn, qp->s_last_psn + 1))) 1482f48ad614SDennis Dalessandro goto ack_seq_err; 1483f48ad614SDennis Dalessandro if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) 1484f48ad614SDennis Dalessandro goto ack_op_err; 1485f48ad614SDennis Dalessandro read_middle: 1486f48ad614SDennis Dalessandro if (unlikely(tlen != (hdrsize + pmtu + 4))) 1487f48ad614SDennis Dalessandro goto ack_len_err; 1488f48ad614SDennis Dalessandro if (unlikely(pmtu >= qp->s_rdma_read_len)) 1489f48ad614SDennis Dalessandro goto ack_len_err; 1490f48ad614SDennis Dalessandro 1491f48ad614SDennis Dalessandro /* 1492f48ad614SDennis Dalessandro * We got a response so update the timeout. 1493f48ad614SDennis Dalessandro * 4.096 usec. * (1 << qp->timeout) 1494f48ad614SDennis Dalessandro */ 149556acbbfbSVenkata Sandeep Dhanalakota rvt_mod_retry_timer(qp); 1496f48ad614SDennis Dalessandro if (qp->s_flags & RVT_S_WAIT_ACK) { 1497f48ad614SDennis Dalessandro qp->s_flags &= ~RVT_S_WAIT_ACK; 1498f48ad614SDennis Dalessandro hfi1_schedule_send(qp); 1499f48ad614SDennis Dalessandro } 1500f48ad614SDennis Dalessandro 1501f48ad614SDennis Dalessandro if (opcode == OP(RDMA_READ_RESPONSE_MIDDLE)) 1502f48ad614SDennis Dalessandro qp->s_retry = qp->s_retry_cnt; 1503f48ad614SDennis Dalessandro 1504f48ad614SDennis Dalessandro /* 1505f48ad614SDennis Dalessandro * Update the RDMA receive state but do the copy w/o 1506f48ad614SDennis Dalessandro * holding the locks and blocking interrupts. 1507f48ad614SDennis Dalessandro */ 1508f48ad614SDennis Dalessandro qp->s_rdma_read_len -= pmtu; 1509f48ad614SDennis Dalessandro update_last_psn(qp, psn); 1510f48ad614SDennis Dalessandro spin_unlock_irqrestore(&qp->s_lock, flags); 1511f48ad614SDennis Dalessandro hfi1_copy_sge(&qp->s_rdma_read_sge, data, pmtu, 0, 0); 1512f48ad614SDennis Dalessandro goto bail; 1513f48ad614SDennis Dalessandro 1514f48ad614SDennis Dalessandro case OP(RDMA_READ_RESPONSE_ONLY): 1515f48ad614SDennis Dalessandro aeth = be32_to_cpu(ohdr->u.aeth); 1516f48ad614SDennis Dalessandro if (!do_rc_ack(qp, aeth, psn, opcode, 0, rcd)) 1517f48ad614SDennis Dalessandro goto ack_done; 1518f48ad614SDennis Dalessandro /* Get the number of bytes the message was padded by. */ 1519f48ad614SDennis Dalessandro pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; 1520f48ad614SDennis Dalessandro /* 1521f48ad614SDennis Dalessandro * Check that the data size is >= 0 && <= pmtu. 1522f48ad614SDennis Dalessandro * Remember to account for ICRC (4). 1523f48ad614SDennis Dalessandro */ 1524f48ad614SDennis Dalessandro if (unlikely(tlen < (hdrsize + pad + 4))) 1525f48ad614SDennis Dalessandro goto ack_len_err; 1526f48ad614SDennis Dalessandro /* 1527f48ad614SDennis Dalessandro * If this is a response to a resent RDMA read, we 1528f48ad614SDennis Dalessandro * have to be careful to copy the data to the right 1529f48ad614SDennis Dalessandro * location. 1530f48ad614SDennis Dalessandro */ 1531f48ad614SDennis Dalessandro wqe = rvt_get_swqe_ptr(qp, qp->s_acked); 1532f48ad614SDennis Dalessandro qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, 1533f48ad614SDennis Dalessandro wqe, psn, pmtu); 1534f48ad614SDennis Dalessandro goto read_last; 1535f48ad614SDennis Dalessandro 1536f48ad614SDennis Dalessandro case OP(RDMA_READ_RESPONSE_LAST): 1537f48ad614SDennis Dalessandro /* ACKs READ req. */ 1538f48ad614SDennis Dalessandro if (unlikely(cmp_psn(psn, qp->s_last_psn + 1))) 1539f48ad614SDennis Dalessandro goto ack_seq_err; 1540f48ad614SDennis Dalessandro if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) 1541f48ad614SDennis Dalessandro goto ack_op_err; 1542f48ad614SDennis Dalessandro /* Get the number of bytes the message was padded by. */ 1543f48ad614SDennis Dalessandro pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; 1544f48ad614SDennis Dalessandro /* 1545f48ad614SDennis Dalessandro * Check that the data size is >= 1 && <= pmtu. 1546f48ad614SDennis Dalessandro * Remember to account for ICRC (4). 1547f48ad614SDennis Dalessandro */ 1548f48ad614SDennis Dalessandro if (unlikely(tlen <= (hdrsize + pad + 4))) 1549f48ad614SDennis Dalessandro goto ack_len_err; 1550f48ad614SDennis Dalessandro read_last: 1551f48ad614SDennis Dalessandro tlen -= hdrsize + pad + 4; 1552f48ad614SDennis Dalessandro if (unlikely(tlen != qp->s_rdma_read_len)) 1553f48ad614SDennis Dalessandro goto ack_len_err; 1554f48ad614SDennis Dalessandro aeth = be32_to_cpu(ohdr->u.aeth); 1555f48ad614SDennis Dalessandro hfi1_copy_sge(&qp->s_rdma_read_sge, data, tlen, 0, 0); 1556f48ad614SDennis Dalessandro WARN_ON(qp->s_rdma_read_sge.num_sge); 1557f48ad614SDennis Dalessandro (void)do_rc_ack(qp, aeth, psn, 1558f48ad614SDennis Dalessandro OP(RDMA_READ_RESPONSE_LAST), 0, rcd); 1559f48ad614SDennis Dalessandro goto ack_done; 1560f48ad614SDennis Dalessandro } 1561f48ad614SDennis Dalessandro 1562f48ad614SDennis Dalessandro ack_op_err: 1563f48ad614SDennis Dalessandro status = IB_WC_LOC_QP_OP_ERR; 1564f48ad614SDennis Dalessandro goto ack_err; 1565f48ad614SDennis Dalessandro 1566f48ad614SDennis Dalessandro ack_seq_err: 1567f48ad614SDennis Dalessandro rdma_seq_err(qp, ibp, psn, rcd); 1568f48ad614SDennis Dalessandro goto ack_done; 1569f48ad614SDennis Dalessandro 1570f48ad614SDennis Dalessandro ack_len_err: 1571f48ad614SDennis Dalessandro status = IB_WC_LOC_LEN_ERR; 1572f48ad614SDennis Dalessandro ack_err: 1573f48ad614SDennis Dalessandro if (qp->s_last == qp->s_acked) { 1574f48ad614SDennis Dalessandro hfi1_send_complete(qp, wqe, status); 1575f48ad614SDennis Dalessandro rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR); 1576f48ad614SDennis Dalessandro } 1577f48ad614SDennis Dalessandro ack_done: 1578f48ad614SDennis Dalessandro spin_unlock_irqrestore(&qp->s_lock, flags); 1579f48ad614SDennis Dalessandro bail: 1580f48ad614SDennis Dalessandro return; 1581f48ad614SDennis Dalessandro } 1582f48ad614SDennis Dalessandro 1583f48ad614SDennis Dalessandro static inline void rc_defered_ack(struct hfi1_ctxtdata *rcd, 1584f48ad614SDennis Dalessandro struct rvt_qp *qp) 1585f48ad614SDennis Dalessandro { 1586f48ad614SDennis Dalessandro if (list_empty(&qp->rspwait)) { 1587f48ad614SDennis Dalessandro qp->r_flags |= RVT_R_RSP_NAK; 15884d6f85c3SMike Marciniszyn rvt_get_qp(qp); 1589f48ad614SDennis Dalessandro list_add_tail(&qp->rspwait, &rcd->qp_wait_list); 1590f48ad614SDennis Dalessandro } 1591f48ad614SDennis Dalessandro } 1592f48ad614SDennis Dalessandro 1593f48ad614SDennis Dalessandro static inline void rc_cancel_ack(struct rvt_qp *qp) 1594f48ad614SDennis Dalessandro { 1595f48ad614SDennis Dalessandro struct hfi1_qp_priv *priv = qp->priv; 1596f48ad614SDennis Dalessandro 1597f48ad614SDennis Dalessandro priv->r_adefered = 0; 1598f48ad614SDennis Dalessandro if (list_empty(&qp->rspwait)) 1599f48ad614SDennis Dalessandro return; 1600f48ad614SDennis Dalessandro list_del_init(&qp->rspwait); 1601f48ad614SDennis Dalessandro qp->r_flags &= ~RVT_R_RSP_NAK; 16024d6f85c3SMike Marciniszyn rvt_put_qp(qp); 1603f48ad614SDennis Dalessandro } 1604f48ad614SDennis Dalessandro 1605f48ad614SDennis Dalessandro /** 1606f48ad614SDennis Dalessandro * rc_rcv_error - process an incoming duplicate or error RC packet 1607f48ad614SDennis Dalessandro * @ohdr: the other headers for this packet 1608f48ad614SDennis Dalessandro * @data: the packet data 1609f48ad614SDennis Dalessandro * @qp: the QP for this packet 1610f48ad614SDennis Dalessandro * @opcode: the opcode for this packet 1611f48ad614SDennis Dalessandro * @psn: the packet sequence number for this packet 1612f48ad614SDennis Dalessandro * @diff: the difference between the PSN and the expected PSN 1613f48ad614SDennis Dalessandro * 1614f48ad614SDennis Dalessandro * This is called from hfi1_rc_rcv() to process an unexpected 1615f48ad614SDennis Dalessandro * incoming RC packet for the given QP. 1616f48ad614SDennis Dalessandro * Called at interrupt level. 1617f48ad614SDennis Dalessandro * Return 1 if no more processing is needed; otherwise return 0 to 1618f48ad614SDennis Dalessandro * schedule a response to be sent. 1619f48ad614SDennis Dalessandro */ 1620261a4351SMike Marciniszyn static noinline int rc_rcv_error(struct ib_other_headers *ohdr, void *data, 1621f48ad614SDennis Dalessandro struct rvt_qp *qp, u32 opcode, u32 psn, 1622f48ad614SDennis Dalessandro int diff, struct hfi1_ctxtdata *rcd) 1623f48ad614SDennis Dalessandro { 1624f3e862cbSSebastian Sanchez struct hfi1_ibport *ibp = rcd_to_iport(rcd); 1625f48ad614SDennis Dalessandro struct rvt_ack_entry *e; 1626f48ad614SDennis Dalessandro unsigned long flags; 1627f48ad614SDennis Dalessandro u8 i, prev; 1628f48ad614SDennis Dalessandro int old_req; 1629f48ad614SDennis Dalessandro 1630462b6b21SSebastian Sanchez trace_hfi1_rcv_error(qp, psn); 1631f48ad614SDennis Dalessandro if (diff > 0) { 1632f48ad614SDennis Dalessandro /* 1633f48ad614SDennis Dalessandro * Packet sequence error. 1634f48ad614SDennis Dalessandro * A NAK will ACK earlier sends and RDMA writes. 1635f48ad614SDennis Dalessandro * Don't queue the NAK if we already sent one. 1636f48ad614SDennis Dalessandro */ 1637f48ad614SDennis Dalessandro if (!qp->r_nak_state) { 1638f48ad614SDennis Dalessandro ibp->rvp.n_rc_seqnak++; 1639f48ad614SDennis Dalessandro qp->r_nak_state = IB_NAK_PSN_ERROR; 1640f48ad614SDennis Dalessandro /* Use the expected PSN. */ 1641f48ad614SDennis Dalessandro qp->r_ack_psn = qp->r_psn; 1642f48ad614SDennis Dalessandro /* 1643f48ad614SDennis Dalessandro * Wait to send the sequence NAK until all packets 1644f48ad614SDennis Dalessandro * in the receive queue have been processed. 1645f48ad614SDennis Dalessandro * Otherwise, we end up propagating congestion. 1646f48ad614SDennis Dalessandro */ 1647f48ad614SDennis Dalessandro rc_defered_ack(rcd, qp); 1648f48ad614SDennis Dalessandro } 1649f48ad614SDennis Dalessandro goto done; 1650f48ad614SDennis Dalessandro } 1651f48ad614SDennis Dalessandro 1652f48ad614SDennis Dalessandro /* 1653f48ad614SDennis Dalessandro * Handle a duplicate request. Don't re-execute SEND, RDMA 1654f48ad614SDennis Dalessandro * write or atomic op. Don't NAK errors, just silently drop 1655f48ad614SDennis Dalessandro * the duplicate request. Note that r_sge, r_len, and 1656f48ad614SDennis Dalessandro * r_rcv_len may be in use so don't modify them. 1657f48ad614SDennis Dalessandro * 1658f48ad614SDennis Dalessandro * We are supposed to ACK the earliest duplicate PSN but we 1659f48ad614SDennis Dalessandro * can coalesce an outstanding duplicate ACK. We have to 1660f48ad614SDennis Dalessandro * send the earliest so that RDMA reads can be restarted at 1661f48ad614SDennis Dalessandro * the requester's expected PSN. 1662f48ad614SDennis Dalessandro * 1663f48ad614SDennis Dalessandro * First, find where this duplicate PSN falls within the 1664f48ad614SDennis Dalessandro * ACKs previously sent. 1665f48ad614SDennis Dalessandro * old_req is true if there is an older response that is scheduled 1666f48ad614SDennis Dalessandro * to be sent before sending this one. 1667f48ad614SDennis Dalessandro */ 1668f48ad614SDennis Dalessandro e = NULL; 1669f48ad614SDennis Dalessandro old_req = 1; 1670f48ad614SDennis Dalessandro ibp->rvp.n_rc_dupreq++; 1671f48ad614SDennis Dalessandro 1672f48ad614SDennis Dalessandro spin_lock_irqsave(&qp->s_lock, flags); 1673f48ad614SDennis Dalessandro 1674f48ad614SDennis Dalessandro for (i = qp->r_head_ack_queue; ; i = prev) { 1675f48ad614SDennis Dalessandro if (i == qp->s_tail_ack_queue) 1676f48ad614SDennis Dalessandro old_req = 0; 1677f48ad614SDennis Dalessandro if (i) 1678f48ad614SDennis Dalessandro prev = i - 1; 1679f48ad614SDennis Dalessandro else 1680f48ad614SDennis Dalessandro prev = HFI1_MAX_RDMA_ATOMIC; 1681f48ad614SDennis Dalessandro if (prev == qp->r_head_ack_queue) { 1682f48ad614SDennis Dalessandro e = NULL; 1683f48ad614SDennis Dalessandro break; 1684f48ad614SDennis Dalessandro } 1685f48ad614SDennis Dalessandro e = &qp->s_ack_queue[prev]; 1686f48ad614SDennis Dalessandro if (!e->opcode) { 1687f48ad614SDennis Dalessandro e = NULL; 1688f48ad614SDennis Dalessandro break; 1689f48ad614SDennis Dalessandro } 1690f48ad614SDennis Dalessandro if (cmp_psn(psn, e->psn) >= 0) { 1691f48ad614SDennis Dalessandro if (prev == qp->s_tail_ack_queue && 1692f48ad614SDennis Dalessandro cmp_psn(psn, e->lpsn) <= 0) 1693f48ad614SDennis Dalessandro old_req = 0; 1694f48ad614SDennis Dalessandro break; 1695f48ad614SDennis Dalessandro } 1696f48ad614SDennis Dalessandro } 1697f48ad614SDennis Dalessandro switch (opcode) { 1698f48ad614SDennis Dalessandro case OP(RDMA_READ_REQUEST): { 1699f48ad614SDennis Dalessandro struct ib_reth *reth; 1700f48ad614SDennis Dalessandro u32 offset; 1701f48ad614SDennis Dalessandro u32 len; 1702f48ad614SDennis Dalessandro 1703f48ad614SDennis Dalessandro /* 1704f48ad614SDennis Dalessandro * If we didn't find the RDMA read request in the ack queue, 1705f48ad614SDennis Dalessandro * we can ignore this request. 1706f48ad614SDennis Dalessandro */ 1707f48ad614SDennis Dalessandro if (!e || e->opcode != OP(RDMA_READ_REQUEST)) 1708f48ad614SDennis Dalessandro goto unlock_done; 1709f48ad614SDennis Dalessandro /* RETH comes after BTH */ 1710f48ad614SDennis Dalessandro reth = &ohdr->u.rc.reth; 1711f48ad614SDennis Dalessandro /* 1712f48ad614SDennis Dalessandro * Address range must be a subset of the original 1713f48ad614SDennis Dalessandro * request and start on pmtu boundaries. 1714f48ad614SDennis Dalessandro * We reuse the old ack_queue slot since the requester 1715f48ad614SDennis Dalessandro * should not back up and request an earlier PSN for the 1716f48ad614SDennis Dalessandro * same request. 1717f48ad614SDennis Dalessandro */ 1718f48ad614SDennis Dalessandro offset = delta_psn(psn, e->psn) * qp->pmtu; 1719f48ad614SDennis Dalessandro len = be32_to_cpu(reth->length); 1720f48ad614SDennis Dalessandro if (unlikely(offset + len != e->rdma_sge.sge_length)) 1721f48ad614SDennis Dalessandro goto unlock_done; 1722f48ad614SDennis Dalessandro if (e->rdma_sge.mr) { 1723f48ad614SDennis Dalessandro rvt_put_mr(e->rdma_sge.mr); 1724f48ad614SDennis Dalessandro e->rdma_sge.mr = NULL; 1725f48ad614SDennis Dalessandro } 1726f48ad614SDennis Dalessandro if (len != 0) { 1727f48ad614SDennis Dalessandro u32 rkey = be32_to_cpu(reth->rkey); 1728261a4351SMike Marciniszyn u64 vaddr = get_ib_reth_vaddr(reth); 1729f48ad614SDennis Dalessandro int ok; 1730f48ad614SDennis Dalessandro 1731f48ad614SDennis Dalessandro ok = rvt_rkey_ok(qp, &e->rdma_sge, len, vaddr, rkey, 1732f48ad614SDennis Dalessandro IB_ACCESS_REMOTE_READ); 1733f48ad614SDennis Dalessandro if (unlikely(!ok)) 1734f48ad614SDennis Dalessandro goto unlock_done; 1735f48ad614SDennis Dalessandro } else { 1736f48ad614SDennis Dalessandro e->rdma_sge.vaddr = NULL; 1737f48ad614SDennis Dalessandro e->rdma_sge.length = 0; 1738f48ad614SDennis Dalessandro e->rdma_sge.sge_length = 0; 1739f48ad614SDennis Dalessandro } 1740f48ad614SDennis Dalessandro e->psn = psn; 1741f48ad614SDennis Dalessandro if (old_req) 1742f48ad614SDennis Dalessandro goto unlock_done; 1743f48ad614SDennis Dalessandro qp->s_tail_ack_queue = prev; 1744f48ad614SDennis Dalessandro break; 1745f48ad614SDennis Dalessandro } 1746f48ad614SDennis Dalessandro 1747f48ad614SDennis Dalessandro case OP(COMPARE_SWAP): 1748f48ad614SDennis Dalessandro case OP(FETCH_ADD): { 1749f48ad614SDennis Dalessandro /* 1750f48ad614SDennis Dalessandro * If we didn't find the atomic request in the ack queue 1751ca00c62bSDennis Dalessandro * or the send engine is already backed up to send an 1752f48ad614SDennis Dalessandro * earlier entry, we can ignore this request. 1753f48ad614SDennis Dalessandro */ 1754f48ad614SDennis Dalessandro if (!e || e->opcode != (u8)opcode || old_req) 1755f48ad614SDennis Dalessandro goto unlock_done; 1756f48ad614SDennis Dalessandro qp->s_tail_ack_queue = prev; 1757f48ad614SDennis Dalessandro break; 1758f48ad614SDennis Dalessandro } 1759f48ad614SDennis Dalessandro 1760f48ad614SDennis Dalessandro default: 1761f48ad614SDennis Dalessandro /* 1762f48ad614SDennis Dalessandro * Ignore this operation if it doesn't request an ACK 1763f48ad614SDennis Dalessandro * or an earlier RDMA read or atomic is going to be resent. 1764f48ad614SDennis Dalessandro */ 1765f48ad614SDennis Dalessandro if (!(psn & IB_BTH_REQ_ACK) || old_req) 1766f48ad614SDennis Dalessandro goto unlock_done; 1767f48ad614SDennis Dalessandro /* 1768f48ad614SDennis Dalessandro * Resend the most recent ACK if this request is 1769f48ad614SDennis Dalessandro * after all the previous RDMA reads and atomics. 1770f48ad614SDennis Dalessandro */ 1771f48ad614SDennis Dalessandro if (i == qp->r_head_ack_queue) { 1772f48ad614SDennis Dalessandro spin_unlock_irqrestore(&qp->s_lock, flags); 1773f48ad614SDennis Dalessandro qp->r_nak_state = 0; 1774f48ad614SDennis Dalessandro qp->r_ack_psn = qp->r_psn - 1; 1775f48ad614SDennis Dalessandro goto send_ack; 1776f48ad614SDennis Dalessandro } 1777f48ad614SDennis Dalessandro 1778f48ad614SDennis Dalessandro /* 1779f48ad614SDennis Dalessandro * Resend the RDMA read or atomic op which 1780f48ad614SDennis Dalessandro * ACKs this duplicate request. 1781f48ad614SDennis Dalessandro */ 1782f48ad614SDennis Dalessandro qp->s_tail_ack_queue = i; 1783f48ad614SDennis Dalessandro break; 1784f48ad614SDennis Dalessandro } 1785f48ad614SDennis Dalessandro qp->s_ack_state = OP(ACKNOWLEDGE); 1786f48ad614SDennis Dalessandro qp->s_flags |= RVT_S_RESP_PENDING; 1787f48ad614SDennis Dalessandro qp->r_nak_state = 0; 1788f48ad614SDennis Dalessandro hfi1_schedule_send(qp); 1789f48ad614SDennis Dalessandro 1790f48ad614SDennis Dalessandro unlock_done: 1791f48ad614SDennis Dalessandro spin_unlock_irqrestore(&qp->s_lock, flags); 1792f48ad614SDennis Dalessandro done: 1793f48ad614SDennis Dalessandro return 1; 1794f48ad614SDennis Dalessandro 1795f48ad614SDennis Dalessandro send_ack: 1796f48ad614SDennis Dalessandro return 0; 1797f48ad614SDennis Dalessandro } 1798f48ad614SDennis Dalessandro 1799f48ad614SDennis Dalessandro static inline void update_ack_queue(struct rvt_qp *qp, unsigned n) 1800f48ad614SDennis Dalessandro { 1801f48ad614SDennis Dalessandro unsigned next; 1802f48ad614SDennis Dalessandro 1803f48ad614SDennis Dalessandro next = n + 1; 1804f48ad614SDennis Dalessandro if (next > HFI1_MAX_RDMA_ATOMIC) 1805f48ad614SDennis Dalessandro next = 0; 1806f48ad614SDennis Dalessandro qp->s_tail_ack_queue = next; 1807f48ad614SDennis Dalessandro qp->s_ack_state = OP(ACKNOWLEDGE); 1808f48ad614SDennis Dalessandro } 1809f48ad614SDennis Dalessandro 1810f48ad614SDennis Dalessandro static void log_cca_event(struct hfi1_pportdata *ppd, u8 sl, u32 rlid, 1811f48ad614SDennis Dalessandro u32 lqpn, u32 rqpn, u8 svc_type) 1812f48ad614SDennis Dalessandro { 1813f48ad614SDennis Dalessandro struct opa_hfi1_cong_log_event_internal *cc_event; 1814f48ad614SDennis Dalessandro unsigned long flags; 1815f48ad614SDennis Dalessandro 1816f48ad614SDennis Dalessandro if (sl >= OPA_MAX_SLS) 1817f48ad614SDennis Dalessandro return; 1818f48ad614SDennis Dalessandro 1819f48ad614SDennis Dalessandro spin_lock_irqsave(&ppd->cc_log_lock, flags); 1820f48ad614SDennis Dalessandro 1821f48ad614SDennis Dalessandro ppd->threshold_cong_event_map[sl / 8] |= 1 << (sl % 8); 1822f48ad614SDennis Dalessandro ppd->threshold_event_counter++; 1823f48ad614SDennis Dalessandro 1824f48ad614SDennis Dalessandro cc_event = &ppd->cc_events[ppd->cc_log_idx++]; 1825f48ad614SDennis Dalessandro if (ppd->cc_log_idx == OPA_CONG_LOG_ELEMS) 1826f48ad614SDennis Dalessandro ppd->cc_log_idx = 0; 1827f48ad614SDennis Dalessandro cc_event->lqpn = lqpn & RVT_QPN_MASK; 1828f48ad614SDennis Dalessandro cc_event->rqpn = rqpn & RVT_QPN_MASK; 1829f48ad614SDennis Dalessandro cc_event->sl = sl; 1830f48ad614SDennis Dalessandro cc_event->svc_type = svc_type; 1831f48ad614SDennis Dalessandro cc_event->rlid = rlid; 1832f48ad614SDennis Dalessandro /* keep timestamp in units of 1.024 usec */ 1833f48ad614SDennis Dalessandro cc_event->timestamp = ktime_to_ns(ktime_get()) / 1024; 1834f48ad614SDennis Dalessandro 1835f48ad614SDennis Dalessandro spin_unlock_irqrestore(&ppd->cc_log_lock, flags); 1836f48ad614SDennis Dalessandro } 1837f48ad614SDennis Dalessandro 1838f48ad614SDennis Dalessandro void process_becn(struct hfi1_pportdata *ppd, u8 sl, u16 rlid, u32 lqpn, 1839f48ad614SDennis Dalessandro u32 rqpn, u8 svc_type) 1840f48ad614SDennis Dalessandro { 1841f48ad614SDennis Dalessandro struct cca_timer *cca_timer; 1842f48ad614SDennis Dalessandro u16 ccti, ccti_incr, ccti_timer, ccti_limit; 1843f48ad614SDennis Dalessandro u8 trigger_threshold; 1844f48ad614SDennis Dalessandro struct cc_state *cc_state; 1845f48ad614SDennis Dalessandro unsigned long flags; 1846f48ad614SDennis Dalessandro 1847f48ad614SDennis Dalessandro if (sl >= OPA_MAX_SLS) 1848f48ad614SDennis Dalessandro return; 1849f48ad614SDennis Dalessandro 1850f48ad614SDennis Dalessandro cc_state = get_cc_state(ppd); 1851f48ad614SDennis Dalessandro 1852f48ad614SDennis Dalessandro if (!cc_state) 1853f48ad614SDennis Dalessandro return; 1854f48ad614SDennis Dalessandro 1855f48ad614SDennis Dalessandro /* 1856f48ad614SDennis Dalessandro * 1) increase CCTI (for this SL) 1857f48ad614SDennis Dalessandro * 2) select IPG (i.e., call set_link_ipg()) 1858f48ad614SDennis Dalessandro * 3) start timer 1859f48ad614SDennis Dalessandro */ 1860f48ad614SDennis Dalessandro ccti_limit = cc_state->cct.ccti_limit; 1861f48ad614SDennis Dalessandro ccti_incr = cc_state->cong_setting.entries[sl].ccti_increase; 1862f48ad614SDennis Dalessandro ccti_timer = cc_state->cong_setting.entries[sl].ccti_timer; 1863f48ad614SDennis Dalessandro trigger_threshold = 1864f48ad614SDennis Dalessandro cc_state->cong_setting.entries[sl].trigger_threshold; 1865f48ad614SDennis Dalessandro 1866f48ad614SDennis Dalessandro spin_lock_irqsave(&ppd->cca_timer_lock, flags); 1867f48ad614SDennis Dalessandro 1868f48ad614SDennis Dalessandro cca_timer = &ppd->cca_timer[sl]; 1869f48ad614SDennis Dalessandro if (cca_timer->ccti < ccti_limit) { 1870f48ad614SDennis Dalessandro if (cca_timer->ccti + ccti_incr <= ccti_limit) 1871f48ad614SDennis Dalessandro cca_timer->ccti += ccti_incr; 1872f48ad614SDennis Dalessandro else 1873f48ad614SDennis Dalessandro cca_timer->ccti = ccti_limit; 1874f48ad614SDennis Dalessandro set_link_ipg(ppd); 1875f48ad614SDennis Dalessandro } 1876f48ad614SDennis Dalessandro 1877f48ad614SDennis Dalessandro ccti = cca_timer->ccti; 1878f48ad614SDennis Dalessandro 1879f48ad614SDennis Dalessandro if (!hrtimer_active(&cca_timer->hrtimer)) { 1880f48ad614SDennis Dalessandro /* ccti_timer is in units of 1.024 usec */ 1881f48ad614SDennis Dalessandro unsigned long nsec = 1024 * ccti_timer; 1882f48ad614SDennis Dalessandro 1883f48ad614SDennis Dalessandro hrtimer_start(&cca_timer->hrtimer, ns_to_ktime(nsec), 1884f48ad614SDennis Dalessandro HRTIMER_MODE_REL); 1885f48ad614SDennis Dalessandro } 1886f48ad614SDennis Dalessandro 1887f48ad614SDennis Dalessandro spin_unlock_irqrestore(&ppd->cca_timer_lock, flags); 1888f48ad614SDennis Dalessandro 1889f48ad614SDennis Dalessandro if ((trigger_threshold != 0) && (ccti >= trigger_threshold)) 1890f48ad614SDennis Dalessandro log_cca_event(ppd, sl, rlid, lqpn, rqpn, svc_type); 1891f48ad614SDennis Dalessandro } 1892f48ad614SDennis Dalessandro 1893f48ad614SDennis Dalessandro /** 1894f48ad614SDennis Dalessandro * hfi1_rc_rcv - process an incoming RC packet 1895f48ad614SDennis Dalessandro * @rcd: the context pointer 1896f48ad614SDennis Dalessandro * @hdr: the header of this packet 1897f48ad614SDennis Dalessandro * @rcv_flags: flags relevant to rcv processing 1898f48ad614SDennis Dalessandro * @data: the packet data 1899f48ad614SDennis Dalessandro * @tlen: the packet length 1900f48ad614SDennis Dalessandro * @qp: the QP for this packet 1901f48ad614SDennis Dalessandro * 1902f48ad614SDennis Dalessandro * This is called from qp_rcv() to process an incoming RC packet 1903f48ad614SDennis Dalessandro * for the given QP. 1904f48ad614SDennis Dalessandro * May be called at interrupt level. 1905f48ad614SDennis Dalessandro */ 1906f48ad614SDennis Dalessandro void hfi1_rc_rcv(struct hfi1_packet *packet) 1907f48ad614SDennis Dalessandro { 1908f48ad614SDennis Dalessandro struct hfi1_ctxtdata *rcd = packet->rcd; 1909261a4351SMike Marciniszyn struct ib_header *hdr = packet->hdr; 1910f48ad614SDennis Dalessandro u32 rcv_flags = packet->rcv_flags; 1911f48ad614SDennis Dalessandro void *data = packet->ebuf; 1912f48ad614SDennis Dalessandro u32 tlen = packet->tlen; 1913f48ad614SDennis Dalessandro struct rvt_qp *qp = packet->qp; 1914f3e862cbSSebastian Sanchez struct hfi1_ibport *ibp = rcd_to_iport(rcd); 1915261a4351SMike Marciniszyn struct ib_other_headers *ohdr = packet->ohdr; 1916f48ad614SDennis Dalessandro u32 bth0, opcode; 1917f48ad614SDennis Dalessandro u32 hdrsize = packet->hlen; 1918f48ad614SDennis Dalessandro u32 psn; 1919f48ad614SDennis Dalessandro u32 pad; 1920f48ad614SDennis Dalessandro struct ib_wc wc; 1921f48ad614SDennis Dalessandro u32 pmtu = qp->pmtu; 1922f48ad614SDennis Dalessandro int diff; 1923f48ad614SDennis Dalessandro struct ib_reth *reth; 1924f48ad614SDennis Dalessandro unsigned long flags; 1925f48ad614SDennis Dalessandro int ret, is_fecn = 0; 1926f48ad614SDennis Dalessandro int copy_last = 0; 1927a2df0c83SJianxin Xiong u32 rkey; 1928f48ad614SDennis Dalessandro 192968e78b3dSMike Marciniszyn lockdep_assert_held(&qp->r_lock); 1930f48ad614SDennis Dalessandro bth0 = be32_to_cpu(ohdr->bth[0]); 1931f48ad614SDennis Dalessandro if (hfi1_ruc_check_hdr(ibp, hdr, rcv_flags & HFI1_HAS_GRH, qp, bth0)) 1932f48ad614SDennis Dalessandro return; 1933f48ad614SDennis Dalessandro 19345fd2b562SMitko Haralanov is_fecn = process_ecn(qp, packet, false); 1935f48ad614SDennis Dalessandro 1936f48ad614SDennis Dalessandro psn = be32_to_cpu(ohdr->bth[2]); 1937f48ad614SDennis Dalessandro opcode = (bth0 >> 24) & 0xff; 1938f48ad614SDennis Dalessandro 1939f48ad614SDennis Dalessandro /* 1940f48ad614SDennis Dalessandro * Process responses (ACKs) before anything else. Note that the 1941f48ad614SDennis Dalessandro * packet sequence number will be for something in the send work 1942f48ad614SDennis Dalessandro * queue rather than the expected receive packet sequence number. 1943f48ad614SDennis Dalessandro * In other words, this QP is the requester. 1944f48ad614SDennis Dalessandro */ 1945f48ad614SDennis Dalessandro if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) && 1946f48ad614SDennis Dalessandro opcode <= OP(ATOMIC_ACKNOWLEDGE)) { 1947f48ad614SDennis Dalessandro rc_rcv_resp(ibp, ohdr, data, tlen, qp, opcode, psn, 1948f48ad614SDennis Dalessandro hdrsize, pmtu, rcd); 1949f48ad614SDennis Dalessandro if (is_fecn) 1950f48ad614SDennis Dalessandro goto send_ack; 1951f48ad614SDennis Dalessandro return; 1952f48ad614SDennis Dalessandro } 1953f48ad614SDennis Dalessandro 1954f48ad614SDennis Dalessandro /* Compute 24 bits worth of difference. */ 1955f48ad614SDennis Dalessandro diff = delta_psn(psn, qp->r_psn); 1956f48ad614SDennis Dalessandro if (unlikely(diff)) { 1957f48ad614SDennis Dalessandro if (rc_rcv_error(ohdr, data, qp, opcode, psn, diff, rcd)) 1958f48ad614SDennis Dalessandro return; 1959f48ad614SDennis Dalessandro goto send_ack; 1960f48ad614SDennis Dalessandro } 1961f48ad614SDennis Dalessandro 1962f48ad614SDennis Dalessandro /* Check for opcode sequence errors. */ 1963f48ad614SDennis Dalessandro switch (qp->r_state) { 1964f48ad614SDennis Dalessandro case OP(SEND_FIRST): 1965f48ad614SDennis Dalessandro case OP(SEND_MIDDLE): 1966f48ad614SDennis Dalessandro if (opcode == OP(SEND_MIDDLE) || 1967f48ad614SDennis Dalessandro opcode == OP(SEND_LAST) || 1968a2df0c83SJianxin Xiong opcode == OP(SEND_LAST_WITH_IMMEDIATE) || 1969a2df0c83SJianxin Xiong opcode == OP(SEND_LAST_WITH_INVALIDATE)) 1970f48ad614SDennis Dalessandro break; 1971f48ad614SDennis Dalessandro goto nack_inv; 1972f48ad614SDennis Dalessandro 1973f48ad614SDennis Dalessandro case OP(RDMA_WRITE_FIRST): 1974f48ad614SDennis Dalessandro case OP(RDMA_WRITE_MIDDLE): 1975f48ad614SDennis Dalessandro if (opcode == OP(RDMA_WRITE_MIDDLE) || 1976f48ad614SDennis Dalessandro opcode == OP(RDMA_WRITE_LAST) || 1977f48ad614SDennis Dalessandro opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) 1978f48ad614SDennis Dalessandro break; 1979f48ad614SDennis Dalessandro goto nack_inv; 1980f48ad614SDennis Dalessandro 1981f48ad614SDennis Dalessandro default: 1982f48ad614SDennis Dalessandro if (opcode == OP(SEND_MIDDLE) || 1983f48ad614SDennis Dalessandro opcode == OP(SEND_LAST) || 1984f48ad614SDennis Dalessandro opcode == OP(SEND_LAST_WITH_IMMEDIATE) || 1985a2df0c83SJianxin Xiong opcode == OP(SEND_LAST_WITH_INVALIDATE) || 1986f48ad614SDennis Dalessandro opcode == OP(RDMA_WRITE_MIDDLE) || 1987f48ad614SDennis Dalessandro opcode == OP(RDMA_WRITE_LAST) || 1988f48ad614SDennis Dalessandro opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) 1989f48ad614SDennis Dalessandro goto nack_inv; 1990f48ad614SDennis Dalessandro /* 1991f48ad614SDennis Dalessandro * Note that it is up to the requester to not send a new 1992f48ad614SDennis Dalessandro * RDMA read or atomic operation before receiving an ACK 1993f48ad614SDennis Dalessandro * for the previous operation. 1994f48ad614SDennis Dalessandro */ 1995f48ad614SDennis Dalessandro break; 1996f48ad614SDennis Dalessandro } 1997f48ad614SDennis Dalessandro 1998f48ad614SDennis Dalessandro if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST)) 1999beb5a042SBrian Welty rvt_comm_est(qp); 2000f48ad614SDennis Dalessandro 2001f48ad614SDennis Dalessandro /* OK, process the packet. */ 2002f48ad614SDennis Dalessandro switch (opcode) { 2003f48ad614SDennis Dalessandro case OP(SEND_FIRST): 2004f48ad614SDennis Dalessandro ret = hfi1_rvt_get_rwqe(qp, 0); 2005f48ad614SDennis Dalessandro if (ret < 0) 2006f48ad614SDennis Dalessandro goto nack_op_err; 2007f48ad614SDennis Dalessandro if (!ret) 2008f48ad614SDennis Dalessandro goto rnr_nak; 2009f48ad614SDennis Dalessandro qp->r_rcv_len = 0; 2010f48ad614SDennis Dalessandro /* FALLTHROUGH */ 2011f48ad614SDennis Dalessandro case OP(SEND_MIDDLE): 2012f48ad614SDennis Dalessandro case OP(RDMA_WRITE_MIDDLE): 2013f48ad614SDennis Dalessandro send_middle: 2014f48ad614SDennis Dalessandro /* Check for invalid length PMTU or posted rwqe len. */ 2015f48ad614SDennis Dalessandro if (unlikely(tlen != (hdrsize + pmtu + 4))) 2016f48ad614SDennis Dalessandro goto nack_inv; 2017f48ad614SDennis Dalessandro qp->r_rcv_len += pmtu; 2018f48ad614SDennis Dalessandro if (unlikely(qp->r_rcv_len > qp->r_len)) 2019f48ad614SDennis Dalessandro goto nack_inv; 2020f48ad614SDennis Dalessandro hfi1_copy_sge(&qp->r_sge, data, pmtu, 1, 0); 2021f48ad614SDennis Dalessandro break; 2022f48ad614SDennis Dalessandro 2023f48ad614SDennis Dalessandro case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE): 2024f48ad614SDennis Dalessandro /* consume RWQE */ 2025f48ad614SDennis Dalessandro ret = hfi1_rvt_get_rwqe(qp, 1); 2026f48ad614SDennis Dalessandro if (ret < 0) 2027f48ad614SDennis Dalessandro goto nack_op_err; 2028f48ad614SDennis Dalessandro if (!ret) 2029f48ad614SDennis Dalessandro goto rnr_nak; 2030f48ad614SDennis Dalessandro goto send_last_imm; 2031f48ad614SDennis Dalessandro 2032f48ad614SDennis Dalessandro case OP(SEND_ONLY): 2033f48ad614SDennis Dalessandro case OP(SEND_ONLY_WITH_IMMEDIATE): 2034a2df0c83SJianxin Xiong case OP(SEND_ONLY_WITH_INVALIDATE): 2035f48ad614SDennis Dalessandro ret = hfi1_rvt_get_rwqe(qp, 0); 2036f48ad614SDennis Dalessandro if (ret < 0) 2037f48ad614SDennis Dalessandro goto nack_op_err; 2038f48ad614SDennis Dalessandro if (!ret) 2039f48ad614SDennis Dalessandro goto rnr_nak; 2040f48ad614SDennis Dalessandro qp->r_rcv_len = 0; 2041f48ad614SDennis Dalessandro if (opcode == OP(SEND_ONLY)) 2042f48ad614SDennis Dalessandro goto no_immediate_data; 2043a2df0c83SJianxin Xiong if (opcode == OP(SEND_ONLY_WITH_INVALIDATE)) 2044a2df0c83SJianxin Xiong goto send_last_inv; 2045f48ad614SDennis Dalessandro /* FALLTHROUGH for SEND_ONLY_WITH_IMMEDIATE */ 2046f48ad614SDennis Dalessandro case OP(SEND_LAST_WITH_IMMEDIATE): 2047f48ad614SDennis Dalessandro send_last_imm: 2048f48ad614SDennis Dalessandro wc.ex.imm_data = ohdr->u.imm_data; 2049f48ad614SDennis Dalessandro wc.wc_flags = IB_WC_WITH_IMM; 2050f48ad614SDennis Dalessandro goto send_last; 2051a2df0c83SJianxin Xiong case OP(SEND_LAST_WITH_INVALIDATE): 2052a2df0c83SJianxin Xiong send_last_inv: 2053a2df0c83SJianxin Xiong rkey = be32_to_cpu(ohdr->u.ieth); 2054a2df0c83SJianxin Xiong if (rvt_invalidate_rkey(qp, rkey)) 2055a2df0c83SJianxin Xiong goto no_immediate_data; 2056a2df0c83SJianxin Xiong wc.ex.invalidate_rkey = rkey; 2057a2df0c83SJianxin Xiong wc.wc_flags = IB_WC_WITH_INVALIDATE; 2058a2df0c83SJianxin Xiong goto send_last; 2059f48ad614SDennis Dalessandro case OP(RDMA_WRITE_LAST): 2060f48ad614SDennis Dalessandro copy_last = ibpd_to_rvtpd(qp->ibqp.pd)->user; 2061f48ad614SDennis Dalessandro /* fall through */ 2062f48ad614SDennis Dalessandro case OP(SEND_LAST): 2063f48ad614SDennis Dalessandro no_immediate_data: 2064f48ad614SDennis Dalessandro wc.wc_flags = 0; 2065f48ad614SDennis Dalessandro wc.ex.imm_data = 0; 2066f48ad614SDennis Dalessandro send_last: 2067f48ad614SDennis Dalessandro /* Get the number of bytes the message was padded by. */ 2068f48ad614SDennis Dalessandro pad = (bth0 >> 20) & 3; 2069f48ad614SDennis Dalessandro /* Check for invalid length. */ 2070f48ad614SDennis Dalessandro /* LAST len should be >= 1 */ 2071f48ad614SDennis Dalessandro if (unlikely(tlen < (hdrsize + pad + 4))) 2072f48ad614SDennis Dalessandro goto nack_inv; 2073f48ad614SDennis Dalessandro /* Don't count the CRC. */ 2074f48ad614SDennis Dalessandro tlen -= (hdrsize + pad + 4); 2075f48ad614SDennis Dalessandro wc.byte_len = tlen + qp->r_rcv_len; 2076f48ad614SDennis Dalessandro if (unlikely(wc.byte_len > qp->r_len)) 2077f48ad614SDennis Dalessandro goto nack_inv; 2078f48ad614SDennis Dalessandro hfi1_copy_sge(&qp->r_sge, data, tlen, 1, copy_last); 2079f48ad614SDennis Dalessandro rvt_put_ss(&qp->r_sge); 2080f48ad614SDennis Dalessandro qp->r_msn++; 208153e91d26SSebastian Sanchez if (!__test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) 2082f48ad614SDennis Dalessandro break; 2083f48ad614SDennis Dalessandro wc.wr_id = qp->r_wr_id; 2084f48ad614SDennis Dalessandro wc.status = IB_WC_SUCCESS; 2085f48ad614SDennis Dalessandro if (opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE) || 2086f48ad614SDennis Dalessandro opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) 2087f48ad614SDennis Dalessandro wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; 2088f48ad614SDennis Dalessandro else 2089f48ad614SDennis Dalessandro wc.opcode = IB_WC_RECV; 2090f48ad614SDennis Dalessandro wc.qp = &qp->ibqp; 2091f48ad614SDennis Dalessandro wc.src_qp = qp->remote_qpn; 2092f48ad614SDennis Dalessandro wc.slid = qp->remote_ah_attr.dlid; 2093f48ad614SDennis Dalessandro /* 2094f48ad614SDennis Dalessandro * It seems that IB mandates the presence of an SL in a 2095f48ad614SDennis Dalessandro * work completion only for the UD transport (see section 2096f48ad614SDennis Dalessandro * 11.4.2 of IBTA Vol. 1). 2097f48ad614SDennis Dalessandro * 2098f48ad614SDennis Dalessandro * However, the way the SL is chosen below is consistent 2099f48ad614SDennis Dalessandro * with the way that IB/qib works and is trying avoid 2100f48ad614SDennis Dalessandro * introducing incompatibilities. 2101f48ad614SDennis Dalessandro * 2102f48ad614SDennis Dalessandro * See also OPA Vol. 1, section 9.7.6, and table 9-17. 2103f48ad614SDennis Dalessandro */ 2104f48ad614SDennis Dalessandro wc.sl = qp->remote_ah_attr.sl; 2105f48ad614SDennis Dalessandro /* zero fields that are N/A */ 2106f48ad614SDennis Dalessandro wc.vendor_err = 0; 2107f48ad614SDennis Dalessandro wc.pkey_index = 0; 2108f48ad614SDennis Dalessandro wc.dlid_path_bits = 0; 2109f48ad614SDennis Dalessandro wc.port_num = 0; 2110f48ad614SDennis Dalessandro /* Signal completion event if the solicited bit is set. */ 2111f48ad614SDennis Dalessandro rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 2112f48ad614SDennis Dalessandro (bth0 & IB_BTH_SOLICITED) != 0); 2113f48ad614SDennis Dalessandro break; 2114f48ad614SDennis Dalessandro 2115f48ad614SDennis Dalessandro case OP(RDMA_WRITE_ONLY): 2116f48ad614SDennis Dalessandro copy_last = 1; 2117f48ad614SDennis Dalessandro /* fall through */ 2118f48ad614SDennis Dalessandro case OP(RDMA_WRITE_FIRST): 2119f48ad614SDennis Dalessandro case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): 2120f48ad614SDennis Dalessandro if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) 2121f48ad614SDennis Dalessandro goto nack_inv; 2122f48ad614SDennis Dalessandro /* consume RWQE */ 2123f48ad614SDennis Dalessandro reth = &ohdr->u.rc.reth; 2124f48ad614SDennis Dalessandro qp->r_len = be32_to_cpu(reth->length); 2125f48ad614SDennis Dalessandro qp->r_rcv_len = 0; 2126f48ad614SDennis Dalessandro qp->r_sge.sg_list = NULL; 2127f48ad614SDennis Dalessandro if (qp->r_len != 0) { 2128f48ad614SDennis Dalessandro u32 rkey = be32_to_cpu(reth->rkey); 2129261a4351SMike Marciniszyn u64 vaddr = get_ib_reth_vaddr(reth); 2130f48ad614SDennis Dalessandro int ok; 2131f48ad614SDennis Dalessandro 2132f48ad614SDennis Dalessandro /* Check rkey & NAK */ 2133f48ad614SDennis Dalessandro ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len, vaddr, 2134f48ad614SDennis Dalessandro rkey, IB_ACCESS_REMOTE_WRITE); 2135f48ad614SDennis Dalessandro if (unlikely(!ok)) 2136f48ad614SDennis Dalessandro goto nack_acc; 2137f48ad614SDennis Dalessandro qp->r_sge.num_sge = 1; 2138f48ad614SDennis Dalessandro } else { 2139f48ad614SDennis Dalessandro qp->r_sge.num_sge = 0; 2140f48ad614SDennis Dalessandro qp->r_sge.sge.mr = NULL; 2141f48ad614SDennis Dalessandro qp->r_sge.sge.vaddr = NULL; 2142f48ad614SDennis Dalessandro qp->r_sge.sge.length = 0; 2143f48ad614SDennis Dalessandro qp->r_sge.sge.sge_length = 0; 2144f48ad614SDennis Dalessandro } 2145f48ad614SDennis Dalessandro if (opcode == OP(RDMA_WRITE_FIRST)) 2146f48ad614SDennis Dalessandro goto send_middle; 2147f48ad614SDennis Dalessandro else if (opcode == OP(RDMA_WRITE_ONLY)) 2148f48ad614SDennis Dalessandro goto no_immediate_data; 2149f48ad614SDennis Dalessandro ret = hfi1_rvt_get_rwqe(qp, 1); 2150f48ad614SDennis Dalessandro if (ret < 0) 2151f48ad614SDennis Dalessandro goto nack_op_err; 2152f48ad614SDennis Dalessandro if (!ret) 2153f48ad614SDennis Dalessandro goto rnr_nak; 2154f48ad614SDennis Dalessandro wc.ex.imm_data = ohdr->u.rc.imm_data; 2155f48ad614SDennis Dalessandro wc.wc_flags = IB_WC_WITH_IMM; 2156f48ad614SDennis Dalessandro goto send_last; 2157f48ad614SDennis Dalessandro 2158f48ad614SDennis Dalessandro case OP(RDMA_READ_REQUEST): { 2159f48ad614SDennis Dalessandro struct rvt_ack_entry *e; 2160f48ad614SDennis Dalessandro u32 len; 2161f48ad614SDennis Dalessandro u8 next; 2162f48ad614SDennis Dalessandro 2163f48ad614SDennis Dalessandro if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) 2164f48ad614SDennis Dalessandro goto nack_inv; 2165f48ad614SDennis Dalessandro next = qp->r_head_ack_queue + 1; 2166f48ad614SDennis Dalessandro /* s_ack_queue is size HFI1_MAX_RDMA_ATOMIC+1 so use > not >= */ 2167f48ad614SDennis Dalessandro if (next > HFI1_MAX_RDMA_ATOMIC) 2168f48ad614SDennis Dalessandro next = 0; 2169f48ad614SDennis Dalessandro spin_lock_irqsave(&qp->s_lock, flags); 2170f48ad614SDennis Dalessandro if (unlikely(next == qp->s_tail_ack_queue)) { 2171f48ad614SDennis Dalessandro if (!qp->s_ack_queue[next].sent) 2172f48ad614SDennis Dalessandro goto nack_inv_unlck; 2173f48ad614SDennis Dalessandro update_ack_queue(qp, next); 2174f48ad614SDennis Dalessandro } 2175f48ad614SDennis Dalessandro e = &qp->s_ack_queue[qp->r_head_ack_queue]; 2176f48ad614SDennis Dalessandro if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) { 2177f48ad614SDennis Dalessandro rvt_put_mr(e->rdma_sge.mr); 2178f48ad614SDennis Dalessandro e->rdma_sge.mr = NULL; 2179f48ad614SDennis Dalessandro } 2180f48ad614SDennis Dalessandro reth = &ohdr->u.rc.reth; 2181f48ad614SDennis Dalessandro len = be32_to_cpu(reth->length); 2182f48ad614SDennis Dalessandro if (len) { 2183f48ad614SDennis Dalessandro u32 rkey = be32_to_cpu(reth->rkey); 2184261a4351SMike Marciniszyn u64 vaddr = get_ib_reth_vaddr(reth); 2185f48ad614SDennis Dalessandro int ok; 2186f48ad614SDennis Dalessandro 2187f48ad614SDennis Dalessandro /* Check rkey & NAK */ 2188f48ad614SDennis Dalessandro ok = rvt_rkey_ok(qp, &e->rdma_sge, len, vaddr, 2189f48ad614SDennis Dalessandro rkey, IB_ACCESS_REMOTE_READ); 2190f48ad614SDennis Dalessandro if (unlikely(!ok)) 2191f48ad614SDennis Dalessandro goto nack_acc_unlck; 2192f48ad614SDennis Dalessandro /* 2193f48ad614SDennis Dalessandro * Update the next expected PSN. We add 1 later 2194f48ad614SDennis Dalessandro * below, so only add the remainder here. 2195f48ad614SDennis Dalessandro */ 21965dc80605SMike Marciniszyn qp->r_psn += rvt_div_mtu(qp, len - 1); 2197f48ad614SDennis Dalessandro } else { 2198f48ad614SDennis Dalessandro e->rdma_sge.mr = NULL; 2199f48ad614SDennis Dalessandro e->rdma_sge.vaddr = NULL; 2200f48ad614SDennis Dalessandro e->rdma_sge.length = 0; 2201f48ad614SDennis Dalessandro e->rdma_sge.sge_length = 0; 2202f48ad614SDennis Dalessandro } 2203f48ad614SDennis Dalessandro e->opcode = opcode; 2204f48ad614SDennis Dalessandro e->sent = 0; 2205f48ad614SDennis Dalessandro e->psn = psn; 2206f48ad614SDennis Dalessandro e->lpsn = qp->r_psn; 2207f48ad614SDennis Dalessandro /* 2208f48ad614SDennis Dalessandro * We need to increment the MSN here instead of when we 2209f48ad614SDennis Dalessandro * finish sending the result since a duplicate request would 2210f48ad614SDennis Dalessandro * increment it more than once. 2211f48ad614SDennis Dalessandro */ 2212f48ad614SDennis Dalessandro qp->r_msn++; 2213f48ad614SDennis Dalessandro qp->r_psn++; 2214f48ad614SDennis Dalessandro qp->r_state = opcode; 2215f48ad614SDennis Dalessandro qp->r_nak_state = 0; 2216f48ad614SDennis Dalessandro qp->r_head_ack_queue = next; 2217f48ad614SDennis Dalessandro 2218ca00c62bSDennis Dalessandro /* Schedule the send engine. */ 2219f48ad614SDennis Dalessandro qp->s_flags |= RVT_S_RESP_PENDING; 2220f48ad614SDennis Dalessandro hfi1_schedule_send(qp); 2221f48ad614SDennis Dalessandro 2222f48ad614SDennis Dalessandro spin_unlock_irqrestore(&qp->s_lock, flags); 2223f48ad614SDennis Dalessandro if (is_fecn) 2224f48ad614SDennis Dalessandro goto send_ack; 2225f48ad614SDennis Dalessandro return; 2226f48ad614SDennis Dalessandro } 2227f48ad614SDennis Dalessandro 2228f48ad614SDennis Dalessandro case OP(COMPARE_SWAP): 2229f48ad614SDennis Dalessandro case OP(FETCH_ADD): { 2230f48ad614SDennis Dalessandro struct ib_atomic_eth *ateth; 2231f48ad614SDennis Dalessandro struct rvt_ack_entry *e; 2232f48ad614SDennis Dalessandro u64 vaddr; 2233f48ad614SDennis Dalessandro atomic64_t *maddr; 2234f48ad614SDennis Dalessandro u64 sdata; 2235f48ad614SDennis Dalessandro u32 rkey; 2236f48ad614SDennis Dalessandro u8 next; 2237f48ad614SDennis Dalessandro 2238f48ad614SDennis Dalessandro if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) 2239f48ad614SDennis Dalessandro goto nack_inv; 2240f48ad614SDennis Dalessandro next = qp->r_head_ack_queue + 1; 2241f48ad614SDennis Dalessandro if (next > HFI1_MAX_RDMA_ATOMIC) 2242f48ad614SDennis Dalessandro next = 0; 2243f48ad614SDennis Dalessandro spin_lock_irqsave(&qp->s_lock, flags); 2244f48ad614SDennis Dalessandro if (unlikely(next == qp->s_tail_ack_queue)) { 2245f48ad614SDennis Dalessandro if (!qp->s_ack_queue[next].sent) 2246f48ad614SDennis Dalessandro goto nack_inv_unlck; 2247f48ad614SDennis Dalessandro update_ack_queue(qp, next); 2248f48ad614SDennis Dalessandro } 2249f48ad614SDennis Dalessandro e = &qp->s_ack_queue[qp->r_head_ack_queue]; 2250f48ad614SDennis Dalessandro if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) { 2251f48ad614SDennis Dalessandro rvt_put_mr(e->rdma_sge.mr); 2252f48ad614SDennis Dalessandro e->rdma_sge.mr = NULL; 2253f48ad614SDennis Dalessandro } 2254f48ad614SDennis Dalessandro ateth = &ohdr->u.atomic_eth; 2255261a4351SMike Marciniszyn vaddr = get_ib_ateth_vaddr(ateth); 2256f48ad614SDennis Dalessandro if (unlikely(vaddr & (sizeof(u64) - 1))) 2257f48ad614SDennis Dalessandro goto nack_inv_unlck; 2258f48ad614SDennis Dalessandro rkey = be32_to_cpu(ateth->rkey); 2259f48ad614SDennis Dalessandro /* Check rkey & NAK */ 2260f48ad614SDennis Dalessandro if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), 2261f48ad614SDennis Dalessandro vaddr, rkey, 2262f48ad614SDennis Dalessandro IB_ACCESS_REMOTE_ATOMIC))) 2263f48ad614SDennis Dalessandro goto nack_acc_unlck; 2264f48ad614SDennis Dalessandro /* Perform atomic OP and save result. */ 2265f48ad614SDennis Dalessandro maddr = (atomic64_t *)qp->r_sge.sge.vaddr; 2266261a4351SMike Marciniszyn sdata = get_ib_ateth_swap(ateth); 2267f48ad614SDennis Dalessandro e->atomic_data = (opcode == OP(FETCH_ADD)) ? 2268f48ad614SDennis Dalessandro (u64)atomic64_add_return(sdata, maddr) - sdata : 2269f48ad614SDennis Dalessandro (u64)cmpxchg((u64 *)qp->r_sge.sge.vaddr, 2270261a4351SMike Marciniszyn get_ib_ateth_compare(ateth), 2271f48ad614SDennis Dalessandro sdata); 2272f48ad614SDennis Dalessandro rvt_put_mr(qp->r_sge.sge.mr); 2273f48ad614SDennis Dalessandro qp->r_sge.num_sge = 0; 2274f48ad614SDennis Dalessandro e->opcode = opcode; 2275f48ad614SDennis Dalessandro e->sent = 0; 2276f48ad614SDennis Dalessandro e->psn = psn; 2277f48ad614SDennis Dalessandro e->lpsn = psn; 2278f48ad614SDennis Dalessandro qp->r_msn++; 2279f48ad614SDennis Dalessandro qp->r_psn++; 2280f48ad614SDennis Dalessandro qp->r_state = opcode; 2281f48ad614SDennis Dalessandro qp->r_nak_state = 0; 2282f48ad614SDennis Dalessandro qp->r_head_ack_queue = next; 2283f48ad614SDennis Dalessandro 2284ca00c62bSDennis Dalessandro /* Schedule the send engine. */ 2285f48ad614SDennis Dalessandro qp->s_flags |= RVT_S_RESP_PENDING; 2286f48ad614SDennis Dalessandro hfi1_schedule_send(qp); 2287f48ad614SDennis Dalessandro 2288f48ad614SDennis Dalessandro spin_unlock_irqrestore(&qp->s_lock, flags); 2289f48ad614SDennis Dalessandro if (is_fecn) 2290f48ad614SDennis Dalessandro goto send_ack; 2291f48ad614SDennis Dalessandro return; 2292f48ad614SDennis Dalessandro } 2293f48ad614SDennis Dalessandro 2294f48ad614SDennis Dalessandro default: 2295f48ad614SDennis Dalessandro /* NAK unknown opcodes. */ 2296f48ad614SDennis Dalessandro goto nack_inv; 2297f48ad614SDennis Dalessandro } 2298f48ad614SDennis Dalessandro qp->r_psn++; 2299f48ad614SDennis Dalessandro qp->r_state = opcode; 2300f48ad614SDennis Dalessandro qp->r_ack_psn = psn; 2301f48ad614SDennis Dalessandro qp->r_nak_state = 0; 2302f48ad614SDennis Dalessandro /* Send an ACK if requested or required. */ 2303f48ad614SDennis Dalessandro if (psn & IB_BTH_REQ_ACK) { 2304f48ad614SDennis Dalessandro struct hfi1_qp_priv *priv = qp->priv; 2305f48ad614SDennis Dalessandro 2306f48ad614SDennis Dalessandro if (packet->numpkt == 0) { 2307f48ad614SDennis Dalessandro rc_cancel_ack(qp); 2308f48ad614SDennis Dalessandro goto send_ack; 2309f48ad614SDennis Dalessandro } 2310f48ad614SDennis Dalessandro if (priv->r_adefered >= HFI1_PSN_CREDIT) { 2311f48ad614SDennis Dalessandro rc_cancel_ack(qp); 2312f48ad614SDennis Dalessandro goto send_ack; 2313f48ad614SDennis Dalessandro } 2314f48ad614SDennis Dalessandro if (unlikely(is_fecn)) { 2315f48ad614SDennis Dalessandro rc_cancel_ack(qp); 2316f48ad614SDennis Dalessandro goto send_ack; 2317f48ad614SDennis Dalessandro } 2318f48ad614SDennis Dalessandro priv->r_adefered++; 2319f48ad614SDennis Dalessandro rc_defered_ack(rcd, qp); 2320f48ad614SDennis Dalessandro } 2321f48ad614SDennis Dalessandro return; 2322f48ad614SDennis Dalessandro 2323f48ad614SDennis Dalessandro rnr_nak: 2324f48ad614SDennis Dalessandro qp->r_nak_state = qp->r_min_rnr_timer | IB_RNR_NAK; 2325f48ad614SDennis Dalessandro qp->r_ack_psn = qp->r_psn; 2326f48ad614SDennis Dalessandro /* Queue RNR NAK for later */ 2327f48ad614SDennis Dalessandro rc_defered_ack(rcd, qp); 2328f48ad614SDennis Dalessandro return; 2329f48ad614SDennis Dalessandro 2330f48ad614SDennis Dalessandro nack_op_err: 2331beb5a042SBrian Welty rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); 2332f48ad614SDennis Dalessandro qp->r_nak_state = IB_NAK_REMOTE_OPERATIONAL_ERROR; 2333f48ad614SDennis Dalessandro qp->r_ack_psn = qp->r_psn; 2334f48ad614SDennis Dalessandro /* Queue NAK for later */ 2335f48ad614SDennis Dalessandro rc_defered_ack(rcd, qp); 2336f48ad614SDennis Dalessandro return; 2337f48ad614SDennis Dalessandro 2338f48ad614SDennis Dalessandro nack_inv_unlck: 2339f48ad614SDennis Dalessandro spin_unlock_irqrestore(&qp->s_lock, flags); 2340f48ad614SDennis Dalessandro nack_inv: 2341beb5a042SBrian Welty rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); 2342f48ad614SDennis Dalessandro qp->r_nak_state = IB_NAK_INVALID_REQUEST; 2343f48ad614SDennis Dalessandro qp->r_ack_psn = qp->r_psn; 2344f48ad614SDennis Dalessandro /* Queue NAK for later */ 2345f48ad614SDennis Dalessandro rc_defered_ack(rcd, qp); 2346f48ad614SDennis Dalessandro return; 2347f48ad614SDennis Dalessandro 2348f48ad614SDennis Dalessandro nack_acc_unlck: 2349f48ad614SDennis Dalessandro spin_unlock_irqrestore(&qp->s_lock, flags); 2350f48ad614SDennis Dalessandro nack_acc: 2351beb5a042SBrian Welty rvt_rc_error(qp, IB_WC_LOC_PROT_ERR); 2352f48ad614SDennis Dalessandro qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR; 2353f48ad614SDennis Dalessandro qp->r_ack_psn = qp->r_psn; 2354f48ad614SDennis Dalessandro send_ack: 2355f48ad614SDennis Dalessandro hfi1_send_rc_ack(rcd, qp, is_fecn); 2356f48ad614SDennis Dalessandro } 2357f48ad614SDennis Dalessandro 2358f48ad614SDennis Dalessandro void hfi1_rc_hdrerr( 2359f48ad614SDennis Dalessandro struct hfi1_ctxtdata *rcd, 2360261a4351SMike Marciniszyn struct ib_header *hdr, 2361f48ad614SDennis Dalessandro u32 rcv_flags, 2362f48ad614SDennis Dalessandro struct rvt_qp *qp) 2363f48ad614SDennis Dalessandro { 2364f48ad614SDennis Dalessandro int has_grh = rcv_flags & HFI1_HAS_GRH; 2365261a4351SMike Marciniszyn struct ib_other_headers *ohdr; 2366f3e862cbSSebastian Sanchez struct hfi1_ibport *ibp = rcd_to_iport(rcd); 2367f48ad614SDennis Dalessandro int diff; 2368f48ad614SDennis Dalessandro u32 opcode; 2369f48ad614SDennis Dalessandro u32 psn, bth0; 2370f48ad614SDennis Dalessandro 2371f48ad614SDennis Dalessandro /* Check for GRH */ 2372f48ad614SDennis Dalessandro ohdr = &hdr->u.oth; 2373f48ad614SDennis Dalessandro if (has_grh) 2374f48ad614SDennis Dalessandro ohdr = &hdr->u.l.oth; 2375f48ad614SDennis Dalessandro 2376f48ad614SDennis Dalessandro bth0 = be32_to_cpu(ohdr->bth[0]); 2377f48ad614SDennis Dalessandro if (hfi1_ruc_check_hdr(ibp, hdr, has_grh, qp, bth0)) 2378f48ad614SDennis Dalessandro return; 2379f48ad614SDennis Dalessandro 2380f48ad614SDennis Dalessandro psn = be32_to_cpu(ohdr->bth[2]); 2381f48ad614SDennis Dalessandro opcode = (bth0 >> 24) & 0xff; 2382f48ad614SDennis Dalessandro 2383f48ad614SDennis Dalessandro /* Only deal with RDMA Writes for now */ 2384f48ad614SDennis Dalessandro if (opcode < IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST) { 2385f48ad614SDennis Dalessandro diff = delta_psn(psn, qp->r_psn); 2386f48ad614SDennis Dalessandro if (!qp->r_nak_state && diff >= 0) { 2387f48ad614SDennis Dalessandro ibp->rvp.n_rc_seqnak++; 2388f48ad614SDennis Dalessandro qp->r_nak_state = IB_NAK_PSN_ERROR; 2389f48ad614SDennis Dalessandro /* Use the expected PSN. */ 2390f48ad614SDennis Dalessandro qp->r_ack_psn = qp->r_psn; 2391f48ad614SDennis Dalessandro /* 2392f48ad614SDennis Dalessandro * Wait to send the sequence 2393f48ad614SDennis Dalessandro * NAK until all packets 2394f48ad614SDennis Dalessandro * in the receive queue have 2395f48ad614SDennis Dalessandro * been processed. 2396f48ad614SDennis Dalessandro * Otherwise, we end up 2397f48ad614SDennis Dalessandro * propagating congestion. 2398f48ad614SDennis Dalessandro */ 2399f48ad614SDennis Dalessandro rc_defered_ack(rcd, qp); 2400f48ad614SDennis Dalessandro } /* Out of sequence NAK */ 2401f48ad614SDennis Dalessandro } /* QP Request NAKs */ 2402f48ad614SDennis Dalessandro } 2403