1b9be6f18SBernard Metzler // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause 2b9be6f18SBernard Metzler 3b9be6f18SBernard Metzler /* Authors: Bernard Metzler <bmt@zurich.ibm.com> */ 4b9be6f18SBernard Metzler /* Copyright (c) 2008-2019, IBM Corporation */ 5b9be6f18SBernard Metzler 6b9be6f18SBernard Metzler #include <linux/errno.h> 7b9be6f18SBernard Metzler #include <linux/types.h> 8b9be6f18SBernard Metzler #include <linux/net.h> 9b9be6f18SBernard Metzler #include <linux/scatterlist.h> 10b9be6f18SBernard Metzler #include <linux/highmem.h> 11b9be6f18SBernard Metzler #include <net/tcp.h> 12b9be6f18SBernard Metzler 13b9be6f18SBernard Metzler #include <rdma/iw_cm.h> 14b9be6f18SBernard Metzler #include <rdma/ib_verbs.h> 15b9be6f18SBernard Metzler #include <rdma/ib_user_verbs.h> 16b9be6f18SBernard Metzler 17b9be6f18SBernard Metzler #include "siw.h" 18b9be6f18SBernard Metzler #include "siw_verbs.h" 19b9be6f18SBernard Metzler #include "siw_mem.h" 20b9be6f18SBernard Metzler 21b9be6f18SBernard Metzler #define MAX_HDR_INLINE \ 22b9be6f18SBernard Metzler (((uint32_t)(sizeof(struct siw_rreq_pkt) - \ 23b9be6f18SBernard Metzler sizeof(struct iwarp_send))) & 0xF8) 24b9be6f18SBernard Metzler 25b9be6f18SBernard Metzler static struct page *siw_get_pblpage(struct siw_mem *mem, u64 addr, int *idx) 26b9be6f18SBernard Metzler { 27b9be6f18SBernard Metzler struct siw_pbl *pbl = mem->pbl; 28b9be6f18SBernard Metzler u64 offset = addr - mem->va; 29b9be6f18SBernard Metzler u64 paddr = siw_pbl_get_buffer(pbl, offset, NULL, idx); 30b9be6f18SBernard Metzler 31b9be6f18SBernard Metzler if (paddr) 32b9be6f18SBernard Metzler return virt_to_page(paddr); 33b9be6f18SBernard Metzler 34b9be6f18SBernard Metzler return NULL; 35b9be6f18SBernard Metzler } 36b9be6f18SBernard Metzler 37b9be6f18SBernard Metzler /* 38b9be6f18SBernard Metzler * Copy short payload at provided destination payload address 39b9be6f18SBernard Metzler */ 40b9be6f18SBernard Metzler static int siw_try_1seg(struct siw_iwarp_tx *c_tx, u64 paddr) 41b9be6f18SBernard Metzler { 42b9be6f18SBernard Metzler struct siw_wqe *wqe = &c_tx->wqe_active; 43b9be6f18SBernard Metzler struct siw_sge *sge = &wqe->sqe.sge[0]; 44b9be6f18SBernard Metzler u32 bytes = sge->length; 45b9be6f18SBernard Metzler 46b9be6f18SBernard Metzler if (bytes > MAX_HDR_INLINE || wqe->sqe.num_sge != 1) 47b9be6f18SBernard Metzler return MAX_HDR_INLINE + 1; 48b9be6f18SBernard Metzler 49b9be6f18SBernard Metzler if (!bytes) 50b9be6f18SBernard Metzler return 0; 51b9be6f18SBernard Metzler 52b9be6f18SBernard Metzler if (tx_flags(wqe) & SIW_WQE_INLINE) { 53b9be6f18SBernard Metzler memcpy((void *)paddr, &wqe->sqe.sge[1], bytes); 54b9be6f18SBernard Metzler } else { 55b9be6f18SBernard Metzler struct siw_mem *mem = wqe->mem[0]; 56b9be6f18SBernard Metzler 57b9be6f18SBernard Metzler if (!mem->mem_obj) { 58b9be6f18SBernard Metzler /* Kernel client using kva */ 59b9be6f18SBernard Metzler memcpy((void *)paddr, (void *)sge->laddr, bytes); 60b9be6f18SBernard Metzler } else if (c_tx->in_syscall) { 61b9be6f18SBernard Metzler if (copy_from_user((void *)paddr, 62b9be6f18SBernard Metzler (const void __user *)sge->laddr, 63b9be6f18SBernard Metzler bytes)) 64b9be6f18SBernard Metzler return -EFAULT; 65b9be6f18SBernard Metzler } else { 66b9be6f18SBernard Metzler unsigned int off = sge->laddr & ~PAGE_MASK; 67b9be6f18SBernard Metzler struct page *p; 68b9be6f18SBernard Metzler char *buffer; 69b9be6f18SBernard Metzler int pbl_idx = 0; 70b9be6f18SBernard Metzler 71b9be6f18SBernard Metzler if (!mem->is_pbl) 72b9be6f18SBernard Metzler p = siw_get_upage(mem->umem, sge->laddr); 73b9be6f18SBernard Metzler else 74b9be6f18SBernard Metzler p = siw_get_pblpage(mem, sge->laddr, &pbl_idx); 75b9be6f18SBernard Metzler 76b9be6f18SBernard Metzler if (unlikely(!p)) 77b9be6f18SBernard Metzler return -EFAULT; 78b9be6f18SBernard Metzler 79b9be6f18SBernard Metzler buffer = kmap_atomic(p); 80b9be6f18SBernard Metzler 81b9be6f18SBernard Metzler if (likely(PAGE_SIZE - off >= bytes)) { 82b9be6f18SBernard Metzler memcpy((void *)paddr, buffer + off, bytes); 83b9be6f18SBernard Metzler kunmap_atomic(buffer); 84b9be6f18SBernard Metzler } else { 85b9be6f18SBernard Metzler unsigned long part = bytes - (PAGE_SIZE - off); 86b9be6f18SBernard Metzler 87b9be6f18SBernard Metzler memcpy((void *)paddr, buffer + off, part); 88b9be6f18SBernard Metzler kunmap_atomic(buffer); 89b9be6f18SBernard Metzler 90b9be6f18SBernard Metzler if (!mem->is_pbl) 91b9be6f18SBernard Metzler p = siw_get_upage(mem->umem, 92b9be6f18SBernard Metzler sge->laddr + part); 93b9be6f18SBernard Metzler else 94b9be6f18SBernard Metzler p = siw_get_pblpage(mem, 95b9be6f18SBernard Metzler sge->laddr + part, 96b9be6f18SBernard Metzler &pbl_idx); 97b9be6f18SBernard Metzler if (unlikely(!p)) 98b9be6f18SBernard Metzler return -EFAULT; 99b9be6f18SBernard Metzler 100b9be6f18SBernard Metzler buffer = kmap_atomic(p); 101b9be6f18SBernard Metzler memcpy((void *)(paddr + part), buffer, 102b9be6f18SBernard Metzler bytes - part); 103b9be6f18SBernard Metzler kunmap_atomic(buffer); 104b9be6f18SBernard Metzler } 105b9be6f18SBernard Metzler } 106b9be6f18SBernard Metzler } 107b9be6f18SBernard Metzler return (int)bytes; 108b9be6f18SBernard Metzler } 109b9be6f18SBernard Metzler 110b9be6f18SBernard Metzler #define PKT_FRAGMENTED 1 111b9be6f18SBernard Metzler #define PKT_COMPLETE 0 112b9be6f18SBernard Metzler 113b9be6f18SBernard Metzler /* 114b9be6f18SBernard Metzler * siw_qp_prepare_tx() 115b9be6f18SBernard Metzler * 116b9be6f18SBernard Metzler * Prepare tx state for sending out one fpdu. Builds complete pkt 117b9be6f18SBernard Metzler * if no user data or only immediate data are present. 118b9be6f18SBernard Metzler * 119b9be6f18SBernard Metzler * returns PKT_COMPLETE if complete pkt built, PKT_FRAGMENTED otherwise. 120b9be6f18SBernard Metzler */ 121b9be6f18SBernard Metzler static int siw_qp_prepare_tx(struct siw_iwarp_tx *c_tx) 122b9be6f18SBernard Metzler { 123b9be6f18SBernard Metzler struct siw_wqe *wqe = &c_tx->wqe_active; 124b9be6f18SBernard Metzler char *crc = NULL; 125b9be6f18SBernard Metzler int data = 0; 126b9be6f18SBernard Metzler 127b9be6f18SBernard Metzler switch (tx_type(wqe)) { 128b9be6f18SBernard Metzler case SIW_OP_READ: 129b9be6f18SBernard Metzler case SIW_OP_READ_LOCAL_INV: 130b9be6f18SBernard Metzler memcpy(&c_tx->pkt.ctrl, 131b9be6f18SBernard Metzler &iwarp_pktinfo[RDMAP_RDMA_READ_REQ].ctrl, 132b9be6f18SBernard Metzler sizeof(struct iwarp_ctrl)); 133b9be6f18SBernard Metzler 134b9be6f18SBernard Metzler c_tx->pkt.rreq.rsvd = 0; 135b9be6f18SBernard Metzler c_tx->pkt.rreq.ddp_qn = htonl(RDMAP_UNTAGGED_QN_RDMA_READ); 136b9be6f18SBernard Metzler c_tx->pkt.rreq.ddp_msn = 137b9be6f18SBernard Metzler htonl(++c_tx->ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ]); 138b9be6f18SBernard Metzler c_tx->pkt.rreq.ddp_mo = 0; 139b9be6f18SBernard Metzler c_tx->pkt.rreq.sink_stag = htonl(wqe->sqe.sge[0].lkey); 140b9be6f18SBernard Metzler c_tx->pkt.rreq.sink_to = 141b9be6f18SBernard Metzler cpu_to_be64(wqe->sqe.sge[0].laddr); 142b9be6f18SBernard Metzler c_tx->pkt.rreq.source_stag = htonl(wqe->sqe.rkey); 143b9be6f18SBernard Metzler c_tx->pkt.rreq.source_to = cpu_to_be64(wqe->sqe.raddr); 144b9be6f18SBernard Metzler c_tx->pkt.rreq.read_size = htonl(wqe->sqe.sge[0].length); 145b9be6f18SBernard Metzler 146b9be6f18SBernard Metzler c_tx->ctrl_len = sizeof(struct iwarp_rdma_rreq); 147b9be6f18SBernard Metzler crc = (char *)&c_tx->pkt.rreq_pkt.crc; 148b9be6f18SBernard Metzler break; 149b9be6f18SBernard Metzler 150b9be6f18SBernard Metzler case SIW_OP_SEND: 151b9be6f18SBernard Metzler if (tx_flags(wqe) & SIW_WQE_SOLICITED) 152b9be6f18SBernard Metzler memcpy(&c_tx->pkt.ctrl, 153b9be6f18SBernard Metzler &iwarp_pktinfo[RDMAP_SEND_SE].ctrl, 154b9be6f18SBernard Metzler sizeof(struct iwarp_ctrl)); 155b9be6f18SBernard Metzler else 156b9be6f18SBernard Metzler memcpy(&c_tx->pkt.ctrl, &iwarp_pktinfo[RDMAP_SEND].ctrl, 157b9be6f18SBernard Metzler sizeof(struct iwarp_ctrl)); 158b9be6f18SBernard Metzler 159b9be6f18SBernard Metzler c_tx->pkt.send.ddp_qn = RDMAP_UNTAGGED_QN_SEND; 160b9be6f18SBernard Metzler c_tx->pkt.send.ddp_msn = 161b9be6f18SBernard Metzler htonl(++c_tx->ddp_msn[RDMAP_UNTAGGED_QN_SEND]); 162b9be6f18SBernard Metzler c_tx->pkt.send.ddp_mo = 0; 163b9be6f18SBernard Metzler 164b9be6f18SBernard Metzler c_tx->pkt.send_inv.inval_stag = 0; 165b9be6f18SBernard Metzler 166b9be6f18SBernard Metzler c_tx->ctrl_len = sizeof(struct iwarp_send); 167b9be6f18SBernard Metzler 168b9be6f18SBernard Metzler crc = (char *)&c_tx->pkt.send_pkt.crc; 169b9be6f18SBernard Metzler data = siw_try_1seg(c_tx, (u64)crc); 170b9be6f18SBernard Metzler break; 171b9be6f18SBernard Metzler 172b9be6f18SBernard Metzler case SIW_OP_SEND_REMOTE_INV: 173b9be6f18SBernard Metzler if (tx_flags(wqe) & SIW_WQE_SOLICITED) 174b9be6f18SBernard Metzler memcpy(&c_tx->pkt.ctrl, 175b9be6f18SBernard Metzler &iwarp_pktinfo[RDMAP_SEND_SE_INVAL].ctrl, 176b9be6f18SBernard Metzler sizeof(struct iwarp_ctrl)); 177b9be6f18SBernard Metzler else 178b9be6f18SBernard Metzler memcpy(&c_tx->pkt.ctrl, 179b9be6f18SBernard Metzler &iwarp_pktinfo[RDMAP_SEND_INVAL].ctrl, 180b9be6f18SBernard Metzler sizeof(struct iwarp_ctrl)); 181b9be6f18SBernard Metzler 182b9be6f18SBernard Metzler c_tx->pkt.send.ddp_qn = RDMAP_UNTAGGED_QN_SEND; 183b9be6f18SBernard Metzler c_tx->pkt.send.ddp_msn = 184b9be6f18SBernard Metzler htonl(++c_tx->ddp_msn[RDMAP_UNTAGGED_QN_SEND]); 185b9be6f18SBernard Metzler c_tx->pkt.send.ddp_mo = 0; 186b9be6f18SBernard Metzler 187b9be6f18SBernard Metzler c_tx->pkt.send_inv.inval_stag = cpu_to_be32(wqe->sqe.rkey); 188b9be6f18SBernard Metzler 189b9be6f18SBernard Metzler c_tx->ctrl_len = sizeof(struct iwarp_send_inv); 190b9be6f18SBernard Metzler 191b9be6f18SBernard Metzler crc = (char *)&c_tx->pkt.send_pkt.crc; 192b9be6f18SBernard Metzler data = siw_try_1seg(c_tx, (u64)crc); 193b9be6f18SBernard Metzler break; 194b9be6f18SBernard Metzler 195b9be6f18SBernard Metzler case SIW_OP_WRITE: 196b9be6f18SBernard Metzler memcpy(&c_tx->pkt.ctrl, &iwarp_pktinfo[RDMAP_RDMA_WRITE].ctrl, 197b9be6f18SBernard Metzler sizeof(struct iwarp_ctrl)); 198b9be6f18SBernard Metzler 199b9be6f18SBernard Metzler c_tx->pkt.rwrite.sink_stag = htonl(wqe->sqe.rkey); 200b9be6f18SBernard Metzler c_tx->pkt.rwrite.sink_to = cpu_to_be64(wqe->sqe.raddr); 201b9be6f18SBernard Metzler c_tx->ctrl_len = sizeof(struct iwarp_rdma_write); 202b9be6f18SBernard Metzler 203b9be6f18SBernard Metzler crc = (char *)&c_tx->pkt.write_pkt.crc; 204b9be6f18SBernard Metzler data = siw_try_1seg(c_tx, (u64)crc); 205b9be6f18SBernard Metzler break; 206b9be6f18SBernard Metzler 207b9be6f18SBernard Metzler case SIW_OP_READ_RESPONSE: 208b9be6f18SBernard Metzler memcpy(&c_tx->pkt.ctrl, 209b9be6f18SBernard Metzler &iwarp_pktinfo[RDMAP_RDMA_READ_RESP].ctrl, 210b9be6f18SBernard Metzler sizeof(struct iwarp_ctrl)); 211b9be6f18SBernard Metzler 212b9be6f18SBernard Metzler /* NBO */ 213b9be6f18SBernard Metzler c_tx->pkt.rresp.sink_stag = cpu_to_be32(wqe->sqe.rkey); 214b9be6f18SBernard Metzler c_tx->pkt.rresp.sink_to = cpu_to_be64(wqe->sqe.raddr); 215b9be6f18SBernard Metzler 216b9be6f18SBernard Metzler c_tx->ctrl_len = sizeof(struct iwarp_rdma_rresp); 217b9be6f18SBernard Metzler 218b9be6f18SBernard Metzler crc = (char *)&c_tx->pkt.write_pkt.crc; 219b9be6f18SBernard Metzler data = siw_try_1seg(c_tx, (u64)crc); 220b9be6f18SBernard Metzler break; 221b9be6f18SBernard Metzler 222b9be6f18SBernard Metzler default: 223b9be6f18SBernard Metzler siw_dbg_qp(tx_qp(c_tx), "stale wqe type %d\n", tx_type(wqe)); 224b9be6f18SBernard Metzler return -EOPNOTSUPP; 225b9be6f18SBernard Metzler } 226b9be6f18SBernard Metzler if (unlikely(data < 0)) 227b9be6f18SBernard Metzler return data; 228b9be6f18SBernard Metzler 229b9be6f18SBernard Metzler c_tx->ctrl_sent = 0; 230b9be6f18SBernard Metzler 231b9be6f18SBernard Metzler if (data <= MAX_HDR_INLINE) { 232b9be6f18SBernard Metzler if (data) { 233b9be6f18SBernard Metzler wqe->processed = data; 234b9be6f18SBernard Metzler 235b9be6f18SBernard Metzler c_tx->pkt.ctrl.mpa_len = 236b9be6f18SBernard Metzler htons(c_tx->ctrl_len + data - MPA_HDR_SIZE); 237b9be6f18SBernard Metzler 238b9be6f18SBernard Metzler /* Add pad, if needed */ 239b9be6f18SBernard Metzler data += -(int)data & 0x3; 240b9be6f18SBernard Metzler /* advance CRC location after payload */ 241b9be6f18SBernard Metzler crc += data; 242b9be6f18SBernard Metzler c_tx->ctrl_len += data; 243b9be6f18SBernard Metzler 244b9be6f18SBernard Metzler if (!(c_tx->pkt.ctrl.ddp_rdmap_ctrl & DDP_FLAG_TAGGED)) 245b9be6f18SBernard Metzler c_tx->pkt.c_untagged.ddp_mo = 0; 246b9be6f18SBernard Metzler else 247b9be6f18SBernard Metzler c_tx->pkt.c_tagged.ddp_to = 248b9be6f18SBernard Metzler cpu_to_be64(wqe->sqe.raddr); 249b9be6f18SBernard Metzler } 250b9be6f18SBernard Metzler 251b9be6f18SBernard Metzler *(u32 *)crc = 0; 252b9be6f18SBernard Metzler /* 253b9be6f18SBernard Metzler * Do complete CRC if enabled and short packet 254b9be6f18SBernard Metzler */ 255b9be6f18SBernard Metzler if (c_tx->mpa_crc_hd) { 256b9be6f18SBernard Metzler crypto_shash_init(c_tx->mpa_crc_hd); 257b9be6f18SBernard Metzler if (crypto_shash_update(c_tx->mpa_crc_hd, 258b9be6f18SBernard Metzler (u8 *)&c_tx->pkt, 259b9be6f18SBernard Metzler c_tx->ctrl_len)) 260b9be6f18SBernard Metzler return -EINVAL; 261b9be6f18SBernard Metzler crypto_shash_final(c_tx->mpa_crc_hd, (u8 *)crc); 262b9be6f18SBernard Metzler } 263b9be6f18SBernard Metzler c_tx->ctrl_len += MPA_CRC_SIZE; 264b9be6f18SBernard Metzler 265b9be6f18SBernard Metzler return PKT_COMPLETE; 266b9be6f18SBernard Metzler } 267b9be6f18SBernard Metzler c_tx->ctrl_len += MPA_CRC_SIZE; 268b9be6f18SBernard Metzler c_tx->sge_idx = 0; 269b9be6f18SBernard Metzler c_tx->sge_off = 0; 270b9be6f18SBernard Metzler c_tx->pbl_idx = 0; 271b9be6f18SBernard Metzler 272b9be6f18SBernard Metzler /* 273b9be6f18SBernard Metzler * Allow direct sending out of user buffer if WR is non signalled 274b9be6f18SBernard Metzler * and payload is over threshold. 275b9be6f18SBernard Metzler * Per RDMA verbs, the application should not change the send buffer 276b9be6f18SBernard Metzler * until the work completed. In iWarp, work completion is only 277b9be6f18SBernard Metzler * local delivery to TCP. TCP may reuse the buffer for 278b9be6f18SBernard Metzler * retransmission. Changing unsent data also breaks the CRC, 279b9be6f18SBernard Metzler * if applied. 280b9be6f18SBernard Metzler */ 281b9be6f18SBernard Metzler if (c_tx->zcopy_tx && wqe->bytes >= SENDPAGE_THRESH && 282b9be6f18SBernard Metzler !(tx_flags(wqe) & SIW_WQE_SIGNALLED)) 283b9be6f18SBernard Metzler c_tx->use_sendpage = 1; 284b9be6f18SBernard Metzler else 285b9be6f18SBernard Metzler c_tx->use_sendpage = 0; 286b9be6f18SBernard Metzler 287b9be6f18SBernard Metzler return PKT_FRAGMENTED; 288b9be6f18SBernard Metzler } 289b9be6f18SBernard Metzler 290b9be6f18SBernard Metzler /* 291b9be6f18SBernard Metzler * Send out one complete control type FPDU, or header of FPDU carrying 292b9be6f18SBernard Metzler * data. Used for fixed sized packets like Read.Requests or zero length 293b9be6f18SBernard Metzler * SENDs, WRITEs, READ.Responses, or header only. 294b9be6f18SBernard Metzler */ 295b9be6f18SBernard Metzler static int siw_tx_ctrl(struct siw_iwarp_tx *c_tx, struct socket *s, 296b9be6f18SBernard Metzler int flags) 297b9be6f18SBernard Metzler { 298b9be6f18SBernard Metzler struct msghdr msg = { .msg_flags = flags }; 299b9be6f18SBernard Metzler struct kvec iov = { .iov_base = 300b9be6f18SBernard Metzler (char *)&c_tx->pkt.ctrl + c_tx->ctrl_sent, 301b9be6f18SBernard Metzler .iov_len = c_tx->ctrl_len - c_tx->ctrl_sent }; 302b9be6f18SBernard Metzler 303b9be6f18SBernard Metzler int rv = kernel_sendmsg(s, &msg, &iov, 1, 304b9be6f18SBernard Metzler c_tx->ctrl_len - c_tx->ctrl_sent); 305b9be6f18SBernard Metzler 306b9be6f18SBernard Metzler if (rv >= 0) { 307b9be6f18SBernard Metzler c_tx->ctrl_sent += rv; 308b9be6f18SBernard Metzler 309b9be6f18SBernard Metzler if (c_tx->ctrl_sent == c_tx->ctrl_len) 310b9be6f18SBernard Metzler rv = 0; 311b9be6f18SBernard Metzler else 312b9be6f18SBernard Metzler rv = -EAGAIN; 313b9be6f18SBernard Metzler } 314b9be6f18SBernard Metzler return rv; 315b9be6f18SBernard Metzler } 316b9be6f18SBernard Metzler 317b9be6f18SBernard Metzler /* 318b9be6f18SBernard Metzler * 0copy TCP transmit interface: Use do_tcp_sendpages. 319b9be6f18SBernard Metzler * 320b9be6f18SBernard Metzler * Using sendpage to push page by page appears to be less efficient 321b9be6f18SBernard Metzler * than using sendmsg, even if data are copied. 322b9be6f18SBernard Metzler * 323b9be6f18SBernard Metzler * A general performance limitation might be the extra four bytes 324b9be6f18SBernard Metzler * trailer checksum segment to be pushed after user data. 325b9be6f18SBernard Metzler */ 326b9be6f18SBernard Metzler static int siw_tcp_sendpages(struct socket *s, struct page **page, int offset, 327b9be6f18SBernard Metzler size_t size) 328b9be6f18SBernard Metzler { 329b9be6f18SBernard Metzler struct sock *sk = s->sk; 330b9be6f18SBernard Metzler int i = 0, rv = 0, sent = 0, 331b9be6f18SBernard Metzler flags = MSG_MORE | MSG_DONTWAIT | MSG_SENDPAGE_NOTLAST; 332b9be6f18SBernard Metzler 333b9be6f18SBernard Metzler while (size) { 334b9be6f18SBernard Metzler size_t bytes = min_t(size_t, PAGE_SIZE - offset, size); 335b9be6f18SBernard Metzler 336b9be6f18SBernard Metzler if (size + offset <= PAGE_SIZE) 337b9be6f18SBernard Metzler flags = MSG_MORE | MSG_DONTWAIT; 338b9be6f18SBernard Metzler 339b9be6f18SBernard Metzler tcp_rate_check_app_limited(sk); 340b9be6f18SBernard Metzler try_page_again: 341b9be6f18SBernard Metzler lock_sock(sk); 342b9be6f18SBernard Metzler rv = do_tcp_sendpages(sk, page[i], offset, bytes, flags); 343b9be6f18SBernard Metzler release_sock(sk); 344b9be6f18SBernard Metzler 345b9be6f18SBernard Metzler if (rv > 0) { 346b9be6f18SBernard Metzler size -= rv; 347b9be6f18SBernard Metzler sent += rv; 348b9be6f18SBernard Metzler if (rv != bytes) { 349b9be6f18SBernard Metzler offset += rv; 350b9be6f18SBernard Metzler bytes -= rv; 351b9be6f18SBernard Metzler goto try_page_again; 352b9be6f18SBernard Metzler } 353b9be6f18SBernard Metzler offset = 0; 354b9be6f18SBernard Metzler } else { 355b9be6f18SBernard Metzler if (rv == -EAGAIN || rv == 0) 356b9be6f18SBernard Metzler break; 357b9be6f18SBernard Metzler return rv; 358b9be6f18SBernard Metzler } 359b9be6f18SBernard Metzler i++; 360b9be6f18SBernard Metzler } 361b9be6f18SBernard Metzler return sent; 362b9be6f18SBernard Metzler } 363b9be6f18SBernard Metzler 364b9be6f18SBernard Metzler /* 365b9be6f18SBernard Metzler * siw_0copy_tx() 366b9be6f18SBernard Metzler * 367b9be6f18SBernard Metzler * Pushes list of pages to TCP socket. If pages from multiple 368b9be6f18SBernard Metzler * SGE's, all referenced pages of each SGE are pushed in one 369b9be6f18SBernard Metzler * shot. 370b9be6f18SBernard Metzler */ 371b9be6f18SBernard Metzler static int siw_0copy_tx(struct socket *s, struct page **page, 372b9be6f18SBernard Metzler struct siw_sge *sge, unsigned int offset, 373b9be6f18SBernard Metzler unsigned int size) 374b9be6f18SBernard Metzler { 375b9be6f18SBernard Metzler int i = 0, sent = 0, rv; 376b9be6f18SBernard Metzler int sge_bytes = min(sge->length - offset, size); 377b9be6f18SBernard Metzler 378b9be6f18SBernard Metzler offset = (sge->laddr + offset) & ~PAGE_MASK; 379b9be6f18SBernard Metzler 380b9be6f18SBernard Metzler while (sent != size) { 381b9be6f18SBernard Metzler rv = siw_tcp_sendpages(s, &page[i], offset, sge_bytes); 382b9be6f18SBernard Metzler if (rv >= 0) { 383b9be6f18SBernard Metzler sent += rv; 384b9be6f18SBernard Metzler if (size == sent || sge_bytes > rv) 385b9be6f18SBernard Metzler break; 386b9be6f18SBernard Metzler 387b9be6f18SBernard Metzler i += PAGE_ALIGN(sge_bytes + offset) >> PAGE_SHIFT; 388b9be6f18SBernard Metzler sge++; 389b9be6f18SBernard Metzler sge_bytes = min(sge->length, size - sent); 390b9be6f18SBernard Metzler offset = sge->laddr & ~PAGE_MASK; 391b9be6f18SBernard Metzler } else { 392b9be6f18SBernard Metzler sent = rv; 393b9be6f18SBernard Metzler break; 394b9be6f18SBernard Metzler } 395b9be6f18SBernard Metzler } 396b9be6f18SBernard Metzler return sent; 397b9be6f18SBernard Metzler } 398b9be6f18SBernard Metzler 399b9be6f18SBernard Metzler #define MAX_TRAILER (MPA_CRC_SIZE + 4) 400b9be6f18SBernard Metzler 401b9be6f18SBernard Metzler static void siw_unmap_pages(struct page **pages, int hdr_len, int num_maps) 402b9be6f18SBernard Metzler { 403b9be6f18SBernard Metzler if (hdr_len) { 404b9be6f18SBernard Metzler ++pages; 405b9be6f18SBernard Metzler --num_maps; 406b9be6f18SBernard Metzler } 407b9be6f18SBernard Metzler while (num_maps-- > 0) { 408b9be6f18SBernard Metzler kunmap(*pages); 409b9be6f18SBernard Metzler pages++; 410b9be6f18SBernard Metzler } 411b9be6f18SBernard Metzler } 412b9be6f18SBernard Metzler 413b9be6f18SBernard Metzler /* 414b9be6f18SBernard Metzler * siw_tx_hdt() tries to push a complete packet to TCP where all 415b9be6f18SBernard Metzler * packet fragments are referenced by the elements of one iovec. 416b9be6f18SBernard Metzler * For the data portion, each involved page must be referenced by 417b9be6f18SBernard Metzler * one extra element. All sge's data can be non-aligned to page 418b9be6f18SBernard Metzler * boundaries. Two more elements are referencing iWARP header 419b9be6f18SBernard Metzler * and trailer: 420b9be6f18SBernard Metzler * MAX_ARRAY = 64KB/PAGE_SIZE + 1 + (2 * (SIW_MAX_SGE - 1) + HDR + TRL 421b9be6f18SBernard Metzler */ 422b9be6f18SBernard Metzler #define MAX_ARRAY ((0xffff / PAGE_SIZE) + 1 + (2 * (SIW_MAX_SGE - 1) + 2)) 423b9be6f18SBernard Metzler 424b9be6f18SBernard Metzler /* 425b9be6f18SBernard Metzler * Write out iov referencing hdr, data and trailer of current FPDU. 426b9be6f18SBernard Metzler * Update transmit state dependent on write return status 427b9be6f18SBernard Metzler */ 428b9be6f18SBernard Metzler static int siw_tx_hdt(struct siw_iwarp_tx *c_tx, struct socket *s) 429b9be6f18SBernard Metzler { 430b9be6f18SBernard Metzler struct siw_wqe *wqe = &c_tx->wqe_active; 431b9be6f18SBernard Metzler struct siw_sge *sge = &wqe->sqe.sge[c_tx->sge_idx]; 432b9be6f18SBernard Metzler struct kvec iov[MAX_ARRAY]; 433b9be6f18SBernard Metzler struct page *page_array[MAX_ARRAY]; 434b9be6f18SBernard Metzler struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_EOR }; 435b9be6f18SBernard Metzler 436b9be6f18SBernard Metzler int seg = 0, do_crc = c_tx->do_crc, is_kva = 0, rv; 437b9be6f18SBernard Metzler unsigned int data_len = c_tx->bytes_unsent, hdr_len = 0, trl_len = 0, 438b9be6f18SBernard Metzler sge_off = c_tx->sge_off, sge_idx = c_tx->sge_idx, 439b9be6f18SBernard Metzler pbl_idx = c_tx->pbl_idx; 440b9be6f18SBernard Metzler 441b9be6f18SBernard Metzler if (c_tx->state == SIW_SEND_HDR) { 442b9be6f18SBernard Metzler if (c_tx->use_sendpage) { 443b9be6f18SBernard Metzler rv = siw_tx_ctrl(c_tx, s, MSG_DONTWAIT | MSG_MORE); 444b9be6f18SBernard Metzler if (rv) 445b9be6f18SBernard Metzler goto done; 446b9be6f18SBernard Metzler 447b9be6f18SBernard Metzler c_tx->state = SIW_SEND_DATA; 448b9be6f18SBernard Metzler } else { 449b9be6f18SBernard Metzler iov[0].iov_base = 450b9be6f18SBernard Metzler (char *)&c_tx->pkt.ctrl + c_tx->ctrl_sent; 451b9be6f18SBernard Metzler iov[0].iov_len = hdr_len = 452b9be6f18SBernard Metzler c_tx->ctrl_len - c_tx->ctrl_sent; 453b9be6f18SBernard Metzler seg = 1; 454b9be6f18SBernard Metzler } 455b9be6f18SBernard Metzler } 456b9be6f18SBernard Metzler 457b9be6f18SBernard Metzler wqe->processed += data_len; 458b9be6f18SBernard Metzler 459b9be6f18SBernard Metzler while (data_len) { /* walk the list of SGE's */ 460b9be6f18SBernard Metzler unsigned int sge_len = min(sge->length - sge_off, data_len); 461b9be6f18SBernard Metzler unsigned int fp_off = (sge->laddr + sge_off) & ~PAGE_MASK; 462b9be6f18SBernard Metzler struct siw_mem *mem; 463b9be6f18SBernard Metzler 464b9be6f18SBernard Metzler if (!(tx_flags(wqe) & SIW_WQE_INLINE)) { 465b9be6f18SBernard Metzler mem = wqe->mem[sge_idx]; 466b9be6f18SBernard Metzler if (!mem->mem_obj) 467b9be6f18SBernard Metzler is_kva = 1; 468b9be6f18SBernard Metzler } else { 469b9be6f18SBernard Metzler is_kva = 1; 470b9be6f18SBernard Metzler } 471b9be6f18SBernard Metzler if (is_kva && !c_tx->use_sendpage) { 472b9be6f18SBernard Metzler /* 473b9be6f18SBernard Metzler * tx from kernel virtual address: either inline data 474b9be6f18SBernard Metzler * or memory region with assigned kernel buffer 475b9be6f18SBernard Metzler */ 476b9be6f18SBernard Metzler iov[seg].iov_base = (void *)(sge->laddr + sge_off); 477b9be6f18SBernard Metzler iov[seg].iov_len = sge_len; 478b9be6f18SBernard Metzler 479b9be6f18SBernard Metzler if (do_crc) 480b9be6f18SBernard Metzler crypto_shash_update(c_tx->mpa_crc_hd, 481b9be6f18SBernard Metzler iov[seg].iov_base, 482b9be6f18SBernard Metzler sge_len); 483b9be6f18SBernard Metzler sge_off += sge_len; 484b9be6f18SBernard Metzler data_len -= sge_len; 485b9be6f18SBernard Metzler seg++; 486b9be6f18SBernard Metzler goto sge_done; 487b9be6f18SBernard Metzler } 488b9be6f18SBernard Metzler 489b9be6f18SBernard Metzler while (sge_len) { 490b9be6f18SBernard Metzler size_t plen = min((int)PAGE_SIZE - fp_off, sge_len); 491b9be6f18SBernard Metzler 492b9be6f18SBernard Metzler if (!is_kva) { 493b9be6f18SBernard Metzler struct page *p; 494b9be6f18SBernard Metzler 495b9be6f18SBernard Metzler if (mem->is_pbl) 496b9be6f18SBernard Metzler p = siw_get_pblpage( 497b9be6f18SBernard Metzler mem, sge->laddr + sge_off, 498b9be6f18SBernard Metzler &pbl_idx); 499b9be6f18SBernard Metzler else 500b9be6f18SBernard Metzler p = siw_get_upage(mem->umem, 501b9be6f18SBernard Metzler sge->laddr + sge_off); 502b9be6f18SBernard Metzler if (unlikely(!p)) { 503b9be6f18SBernard Metzler if (hdr_len) 504b9be6f18SBernard Metzler seg--; 505b9be6f18SBernard Metzler if (!c_tx->use_sendpage && seg) { 506b9be6f18SBernard Metzler siw_unmap_pages(page_array, 507b9be6f18SBernard Metzler hdr_len, seg); 508b9be6f18SBernard Metzler } 509b9be6f18SBernard Metzler wqe->processed -= c_tx->bytes_unsent; 510b9be6f18SBernard Metzler rv = -EFAULT; 511b9be6f18SBernard Metzler goto done_crc; 512b9be6f18SBernard Metzler } 513b9be6f18SBernard Metzler page_array[seg] = p; 514b9be6f18SBernard Metzler 515b9be6f18SBernard Metzler if (!c_tx->use_sendpage) { 516b9be6f18SBernard Metzler iov[seg].iov_base = kmap(p) + fp_off; 517b9be6f18SBernard Metzler iov[seg].iov_len = plen; 518b9be6f18SBernard Metzler if (do_crc) 519b9be6f18SBernard Metzler crypto_shash_update( 520b9be6f18SBernard Metzler c_tx->mpa_crc_hd, 521b9be6f18SBernard Metzler iov[seg].iov_base, 522b9be6f18SBernard Metzler plen); 523b9be6f18SBernard Metzler } else if (do_crc) 524b9be6f18SBernard Metzler crypto_shash_update( 525b9be6f18SBernard Metzler c_tx->mpa_crc_hd, 526b9be6f18SBernard Metzler page_address(p) + fp_off, 527b9be6f18SBernard Metzler plen); 528b9be6f18SBernard Metzler } else { 529b9be6f18SBernard Metzler u64 pa = ((sge->laddr + sge_off) & PAGE_MASK); 530b9be6f18SBernard Metzler 531b9be6f18SBernard Metzler page_array[seg] = virt_to_page(pa); 532b9be6f18SBernard Metzler if (do_crc) 533b9be6f18SBernard Metzler crypto_shash_update( 534b9be6f18SBernard Metzler c_tx->mpa_crc_hd, 535b9be6f18SBernard Metzler (void *)(sge->laddr + sge_off), 536b9be6f18SBernard Metzler plen); 537b9be6f18SBernard Metzler } 538b9be6f18SBernard Metzler 539b9be6f18SBernard Metzler sge_len -= plen; 540b9be6f18SBernard Metzler sge_off += plen; 541b9be6f18SBernard Metzler data_len -= plen; 542b9be6f18SBernard Metzler fp_off = 0; 543b9be6f18SBernard Metzler 544b9be6f18SBernard Metzler if (++seg > (int)MAX_ARRAY) { 545b9be6f18SBernard Metzler siw_dbg_qp(tx_qp(c_tx), "to many fragments\n"); 546b9be6f18SBernard Metzler if (!is_kva && !c_tx->use_sendpage) { 547b9be6f18SBernard Metzler siw_unmap_pages(page_array, hdr_len, 548b9be6f18SBernard Metzler seg - 1); 549b9be6f18SBernard Metzler } 550b9be6f18SBernard Metzler wqe->processed -= c_tx->bytes_unsent; 551b9be6f18SBernard Metzler rv = -EMSGSIZE; 552b9be6f18SBernard Metzler goto done_crc; 553b9be6f18SBernard Metzler } 554b9be6f18SBernard Metzler } 555b9be6f18SBernard Metzler sge_done: 556b9be6f18SBernard Metzler /* Update SGE variables at end of SGE */ 557b9be6f18SBernard Metzler if (sge_off == sge->length && 558b9be6f18SBernard Metzler (data_len != 0 || wqe->processed < wqe->bytes)) { 559b9be6f18SBernard Metzler sge_idx++; 560b9be6f18SBernard Metzler sge++; 561b9be6f18SBernard Metzler sge_off = 0; 562b9be6f18SBernard Metzler } 563b9be6f18SBernard Metzler } 564b9be6f18SBernard Metzler /* trailer */ 565b9be6f18SBernard Metzler if (likely(c_tx->state != SIW_SEND_TRAILER)) { 566b9be6f18SBernard Metzler iov[seg].iov_base = &c_tx->trailer.pad[4 - c_tx->pad]; 567b9be6f18SBernard Metzler iov[seg].iov_len = trl_len = MAX_TRAILER - (4 - c_tx->pad); 568b9be6f18SBernard Metzler } else { 569b9be6f18SBernard Metzler iov[seg].iov_base = &c_tx->trailer.pad[c_tx->ctrl_sent]; 570b9be6f18SBernard Metzler iov[seg].iov_len = trl_len = MAX_TRAILER - c_tx->ctrl_sent; 571b9be6f18SBernard Metzler } 572b9be6f18SBernard Metzler 573b9be6f18SBernard Metzler if (c_tx->pad) { 574b9be6f18SBernard Metzler *(u32 *)c_tx->trailer.pad = 0; 575b9be6f18SBernard Metzler if (do_crc) 576b9be6f18SBernard Metzler crypto_shash_update(c_tx->mpa_crc_hd, 577b9be6f18SBernard Metzler (u8 *)&c_tx->trailer.crc - c_tx->pad, 578b9be6f18SBernard Metzler c_tx->pad); 579b9be6f18SBernard Metzler } 580b9be6f18SBernard Metzler if (!c_tx->mpa_crc_hd) 581b9be6f18SBernard Metzler c_tx->trailer.crc = 0; 582b9be6f18SBernard Metzler else if (do_crc) 583b9be6f18SBernard Metzler crypto_shash_final(c_tx->mpa_crc_hd, (u8 *)&c_tx->trailer.crc); 584b9be6f18SBernard Metzler 585b9be6f18SBernard Metzler data_len = c_tx->bytes_unsent; 586b9be6f18SBernard Metzler 587b9be6f18SBernard Metzler if (c_tx->use_sendpage) { 588b9be6f18SBernard Metzler rv = siw_0copy_tx(s, page_array, &wqe->sqe.sge[c_tx->sge_idx], 589b9be6f18SBernard Metzler c_tx->sge_off, data_len); 590b9be6f18SBernard Metzler if (rv == data_len) { 591b9be6f18SBernard Metzler rv = kernel_sendmsg(s, &msg, &iov[seg], 1, trl_len); 592b9be6f18SBernard Metzler if (rv > 0) 593b9be6f18SBernard Metzler rv += data_len; 594b9be6f18SBernard Metzler else 595b9be6f18SBernard Metzler rv = data_len; 596b9be6f18SBernard Metzler } 597b9be6f18SBernard Metzler } else { 598b9be6f18SBernard Metzler rv = kernel_sendmsg(s, &msg, iov, seg + 1, 599b9be6f18SBernard Metzler hdr_len + data_len + trl_len); 600b9be6f18SBernard Metzler if (!is_kva) 601b9be6f18SBernard Metzler siw_unmap_pages(page_array, hdr_len, seg); 602b9be6f18SBernard Metzler } 603b9be6f18SBernard Metzler if (rv < (int)hdr_len) { 604b9be6f18SBernard Metzler /* Not even complete hdr pushed or negative rv */ 605b9be6f18SBernard Metzler wqe->processed -= data_len; 606b9be6f18SBernard Metzler if (rv >= 0) { 607b9be6f18SBernard Metzler c_tx->ctrl_sent += rv; 608b9be6f18SBernard Metzler rv = -EAGAIN; 609b9be6f18SBernard Metzler } 610b9be6f18SBernard Metzler goto done_crc; 611b9be6f18SBernard Metzler } 612b9be6f18SBernard Metzler rv -= hdr_len; 613b9be6f18SBernard Metzler 614b9be6f18SBernard Metzler if (rv >= (int)data_len) { 615b9be6f18SBernard Metzler /* all user data pushed to TCP or no data to push */ 616b9be6f18SBernard Metzler if (data_len > 0 && wqe->processed < wqe->bytes) { 617b9be6f18SBernard Metzler /* Save the current state for next tx */ 618b9be6f18SBernard Metzler c_tx->sge_idx = sge_idx; 619b9be6f18SBernard Metzler c_tx->sge_off = sge_off; 620b9be6f18SBernard Metzler c_tx->pbl_idx = pbl_idx; 621b9be6f18SBernard Metzler } 622b9be6f18SBernard Metzler rv -= data_len; 623b9be6f18SBernard Metzler 624b9be6f18SBernard Metzler if (rv == trl_len) /* all pushed */ 625b9be6f18SBernard Metzler rv = 0; 626b9be6f18SBernard Metzler else { 627b9be6f18SBernard Metzler c_tx->state = SIW_SEND_TRAILER; 628b9be6f18SBernard Metzler c_tx->ctrl_len = MAX_TRAILER; 629b9be6f18SBernard Metzler c_tx->ctrl_sent = rv + 4 - c_tx->pad; 630b9be6f18SBernard Metzler c_tx->bytes_unsent = 0; 631b9be6f18SBernard Metzler rv = -EAGAIN; 632b9be6f18SBernard Metzler } 633b9be6f18SBernard Metzler 634b9be6f18SBernard Metzler } else if (data_len > 0) { 635b9be6f18SBernard Metzler /* Maybe some user data pushed to TCP */ 636b9be6f18SBernard Metzler c_tx->state = SIW_SEND_DATA; 637b9be6f18SBernard Metzler wqe->processed -= data_len - rv; 638b9be6f18SBernard Metzler 639b9be6f18SBernard Metzler if (rv) { 640b9be6f18SBernard Metzler /* 641b9be6f18SBernard Metzler * Some bytes out. Recompute tx state based 642b9be6f18SBernard Metzler * on old state and bytes pushed 643b9be6f18SBernard Metzler */ 644b9be6f18SBernard Metzler unsigned int sge_unsent; 645b9be6f18SBernard Metzler 646b9be6f18SBernard Metzler c_tx->bytes_unsent -= rv; 647b9be6f18SBernard Metzler sge = &wqe->sqe.sge[c_tx->sge_idx]; 648b9be6f18SBernard Metzler sge_unsent = sge->length - c_tx->sge_off; 649b9be6f18SBernard Metzler 650b9be6f18SBernard Metzler while (sge_unsent <= rv) { 651b9be6f18SBernard Metzler rv -= sge_unsent; 652b9be6f18SBernard Metzler c_tx->sge_idx++; 653b9be6f18SBernard Metzler c_tx->sge_off = 0; 654b9be6f18SBernard Metzler sge++; 655b9be6f18SBernard Metzler sge_unsent = sge->length; 656b9be6f18SBernard Metzler } 657b9be6f18SBernard Metzler c_tx->sge_off += rv; 658b9be6f18SBernard Metzler } 659b9be6f18SBernard Metzler rv = -EAGAIN; 660b9be6f18SBernard Metzler } 661b9be6f18SBernard Metzler done_crc: 662b9be6f18SBernard Metzler c_tx->do_crc = 0; 663b9be6f18SBernard Metzler done: 664b9be6f18SBernard Metzler return rv; 665b9be6f18SBernard Metzler } 666b9be6f18SBernard Metzler 667b9be6f18SBernard Metzler static void siw_update_tcpseg(struct siw_iwarp_tx *c_tx, 668b9be6f18SBernard Metzler struct socket *s) 669b9be6f18SBernard Metzler { 670b9be6f18SBernard Metzler struct tcp_sock *tp = tcp_sk(s->sk); 671b9be6f18SBernard Metzler 672b9be6f18SBernard Metzler if (tp->gso_segs) { 673b9be6f18SBernard Metzler if (c_tx->gso_seg_limit == 0) 674b9be6f18SBernard Metzler c_tx->tcp_seglen = tp->mss_cache * tp->gso_segs; 675b9be6f18SBernard Metzler else 676b9be6f18SBernard Metzler c_tx->tcp_seglen = 677b9be6f18SBernard Metzler tp->mss_cache * 678b9be6f18SBernard Metzler min_t(u16, c_tx->gso_seg_limit, tp->gso_segs); 679b9be6f18SBernard Metzler } else { 680b9be6f18SBernard Metzler c_tx->tcp_seglen = tp->mss_cache; 681b9be6f18SBernard Metzler } 682b9be6f18SBernard Metzler /* Loopback may give odd numbers */ 683b9be6f18SBernard Metzler c_tx->tcp_seglen &= 0xfffffff8; 684b9be6f18SBernard Metzler } 685b9be6f18SBernard Metzler 686b9be6f18SBernard Metzler /* 687b9be6f18SBernard Metzler * siw_prepare_fpdu() 688b9be6f18SBernard Metzler * 689b9be6f18SBernard Metzler * Prepares transmit context to send out one FPDU if FPDU will contain 690b9be6f18SBernard Metzler * user data and user data are not immediate data. 691b9be6f18SBernard Metzler * Computes maximum FPDU length to fill up TCP MSS if possible. 692b9be6f18SBernard Metzler * 693b9be6f18SBernard Metzler * @qp: QP from which to transmit 694b9be6f18SBernard Metzler * @wqe: Current WQE causing transmission 695b9be6f18SBernard Metzler * 696b9be6f18SBernard Metzler * TODO: Take into account real available sendspace on socket 697b9be6f18SBernard Metzler * to avoid header misalignment due to send pausing within 698b9be6f18SBernard Metzler * fpdu transmission 699b9be6f18SBernard Metzler */ 700b9be6f18SBernard Metzler static void siw_prepare_fpdu(struct siw_qp *qp, struct siw_wqe *wqe) 701b9be6f18SBernard Metzler { 702b9be6f18SBernard Metzler struct siw_iwarp_tx *c_tx = &qp->tx_ctx; 703b9be6f18SBernard Metzler int data_len; 704b9be6f18SBernard Metzler 705b9be6f18SBernard Metzler c_tx->ctrl_len = 706b9be6f18SBernard Metzler iwarp_pktinfo[__rdmap_get_opcode(&c_tx->pkt.ctrl)].hdr_len; 707b9be6f18SBernard Metzler c_tx->ctrl_sent = 0; 708b9be6f18SBernard Metzler 709b9be6f18SBernard Metzler /* 710b9be6f18SBernard Metzler * Update target buffer offset if any 711b9be6f18SBernard Metzler */ 712b9be6f18SBernard Metzler if (!(c_tx->pkt.ctrl.ddp_rdmap_ctrl & DDP_FLAG_TAGGED)) 713b9be6f18SBernard Metzler /* Untagged message */ 714b9be6f18SBernard Metzler c_tx->pkt.c_untagged.ddp_mo = cpu_to_be32(wqe->processed); 715b9be6f18SBernard Metzler else /* Tagged message */ 716b9be6f18SBernard Metzler c_tx->pkt.c_tagged.ddp_to = 717b9be6f18SBernard Metzler cpu_to_be64(wqe->sqe.raddr + wqe->processed); 718b9be6f18SBernard Metzler 719b9be6f18SBernard Metzler data_len = wqe->bytes - wqe->processed; 720b9be6f18SBernard Metzler if (data_len + c_tx->ctrl_len + MPA_CRC_SIZE > c_tx->tcp_seglen) { 721b9be6f18SBernard Metzler /* Trim DDP payload to fit into current TCP segment */ 722b9be6f18SBernard Metzler data_len = c_tx->tcp_seglen - (c_tx->ctrl_len + MPA_CRC_SIZE); 723b9be6f18SBernard Metzler c_tx->pkt.ctrl.ddp_rdmap_ctrl &= ~DDP_FLAG_LAST; 724b9be6f18SBernard Metzler c_tx->pad = 0; 725b9be6f18SBernard Metzler } else { 726b9be6f18SBernard Metzler c_tx->pkt.ctrl.ddp_rdmap_ctrl |= DDP_FLAG_LAST; 727b9be6f18SBernard Metzler c_tx->pad = -data_len & 0x3; 728b9be6f18SBernard Metzler } 729b9be6f18SBernard Metzler c_tx->bytes_unsent = data_len; 730b9be6f18SBernard Metzler 731b9be6f18SBernard Metzler c_tx->pkt.ctrl.mpa_len = 732b9be6f18SBernard Metzler htons(c_tx->ctrl_len + data_len - MPA_HDR_SIZE); 733b9be6f18SBernard Metzler 734b9be6f18SBernard Metzler /* 735b9be6f18SBernard Metzler * Init MPA CRC computation 736b9be6f18SBernard Metzler */ 737b9be6f18SBernard Metzler if (c_tx->mpa_crc_hd) { 738b9be6f18SBernard Metzler crypto_shash_init(c_tx->mpa_crc_hd); 739b9be6f18SBernard Metzler crypto_shash_update(c_tx->mpa_crc_hd, (u8 *)&c_tx->pkt, 740b9be6f18SBernard Metzler c_tx->ctrl_len); 741b9be6f18SBernard Metzler c_tx->do_crc = 1; 742b9be6f18SBernard Metzler } 743b9be6f18SBernard Metzler } 744b9be6f18SBernard Metzler 745b9be6f18SBernard Metzler /* 746b9be6f18SBernard Metzler * siw_check_sgl_tx() 747b9be6f18SBernard Metzler * 748b9be6f18SBernard Metzler * Check permissions for a list of SGE's (SGL). 749b9be6f18SBernard Metzler * A successful check will have all memory referenced 750b9be6f18SBernard Metzler * for transmission resolved and assigned to the WQE. 751b9be6f18SBernard Metzler * 752b9be6f18SBernard Metzler * @pd: Protection Domain SGL should belong to 753b9be6f18SBernard Metzler * @wqe: WQE to be checked 754b9be6f18SBernard Metzler * @perms: requested access permissions 755b9be6f18SBernard Metzler * 756b9be6f18SBernard Metzler */ 757b9be6f18SBernard Metzler 758b9be6f18SBernard Metzler static int siw_check_sgl_tx(struct ib_pd *pd, struct siw_wqe *wqe, 759b9be6f18SBernard Metzler enum ib_access_flags perms) 760b9be6f18SBernard Metzler { 761b9be6f18SBernard Metzler struct siw_sge *sge = &wqe->sqe.sge[0]; 762b9be6f18SBernard Metzler int i, len, num_sge = wqe->sqe.num_sge; 763b9be6f18SBernard Metzler 764b9be6f18SBernard Metzler if (unlikely(num_sge > SIW_MAX_SGE)) 765b9be6f18SBernard Metzler return -EINVAL; 766b9be6f18SBernard Metzler 767b9be6f18SBernard Metzler for (i = 0, len = 0; num_sge; num_sge--, i++, sge++) { 768b9be6f18SBernard Metzler /* 769b9be6f18SBernard Metzler * rdma verbs: do not check stag for a zero length sge 770b9be6f18SBernard Metzler */ 771b9be6f18SBernard Metzler if (sge->length) { 772b9be6f18SBernard Metzler int rv = siw_check_sge(pd, sge, &wqe->mem[i], perms, 0, 773b9be6f18SBernard Metzler sge->length); 774b9be6f18SBernard Metzler 775b9be6f18SBernard Metzler if (unlikely(rv != E_ACCESS_OK)) 776b9be6f18SBernard Metzler return rv; 777b9be6f18SBernard Metzler } 778b9be6f18SBernard Metzler len += sge->length; 779b9be6f18SBernard Metzler } 780b9be6f18SBernard Metzler return len; 781b9be6f18SBernard Metzler } 782b9be6f18SBernard Metzler 783b9be6f18SBernard Metzler /* 784b9be6f18SBernard Metzler * siw_qp_sq_proc_tx() 785b9be6f18SBernard Metzler * 786b9be6f18SBernard Metzler * Process one WQE which needs transmission on the wire. 787b9be6f18SBernard Metzler */ 788b9be6f18SBernard Metzler static int siw_qp_sq_proc_tx(struct siw_qp *qp, struct siw_wqe *wqe) 789b9be6f18SBernard Metzler { 790b9be6f18SBernard Metzler struct siw_iwarp_tx *c_tx = &qp->tx_ctx; 791b9be6f18SBernard Metzler struct socket *s = qp->attrs.sk; 792b9be6f18SBernard Metzler int rv = 0, burst_len = qp->tx_ctx.burst; 793b9be6f18SBernard Metzler enum rdmap_ecode ecode = RDMAP_ECODE_CATASTROPHIC_STREAM; 794b9be6f18SBernard Metzler 795b9be6f18SBernard Metzler if (unlikely(wqe->wr_status == SIW_WR_IDLE)) 796b9be6f18SBernard Metzler return 0; 797b9be6f18SBernard Metzler 798b9be6f18SBernard Metzler if (!burst_len) 799b9be6f18SBernard Metzler burst_len = SQ_USER_MAXBURST; 800b9be6f18SBernard Metzler 801b9be6f18SBernard Metzler if (wqe->wr_status == SIW_WR_QUEUED) { 802b9be6f18SBernard Metzler if (!(wqe->sqe.flags & SIW_WQE_INLINE)) { 803b9be6f18SBernard Metzler if (tx_type(wqe) == SIW_OP_READ_RESPONSE) 804b9be6f18SBernard Metzler wqe->sqe.num_sge = 1; 805b9be6f18SBernard Metzler 806b9be6f18SBernard Metzler if (tx_type(wqe) != SIW_OP_READ && 807b9be6f18SBernard Metzler tx_type(wqe) != SIW_OP_READ_LOCAL_INV) { 808b9be6f18SBernard Metzler /* 809b9be6f18SBernard Metzler * Reference memory to be tx'd w/o checking 810b9be6f18SBernard Metzler * access for LOCAL_READ permission, since 811b9be6f18SBernard Metzler * not defined in RDMA core. 812b9be6f18SBernard Metzler */ 813b9be6f18SBernard Metzler rv = siw_check_sgl_tx(qp->pd, wqe, 0); 814b9be6f18SBernard Metzler if (rv < 0) { 815b9be6f18SBernard Metzler if (tx_type(wqe) == 816b9be6f18SBernard Metzler SIW_OP_READ_RESPONSE) 817b9be6f18SBernard Metzler ecode = siw_rdmap_error(-rv); 818b9be6f18SBernard Metzler rv = -EINVAL; 819b9be6f18SBernard Metzler goto tx_error; 820b9be6f18SBernard Metzler } 821b9be6f18SBernard Metzler wqe->bytes = rv; 822b9be6f18SBernard Metzler } else { 823b9be6f18SBernard Metzler wqe->bytes = 0; 824b9be6f18SBernard Metzler } 825b9be6f18SBernard Metzler } else { 826b9be6f18SBernard Metzler wqe->bytes = wqe->sqe.sge[0].length; 827b9be6f18SBernard Metzler if (!qp->kernel_verbs) { 828b9be6f18SBernard Metzler if (wqe->bytes > SIW_MAX_INLINE) { 829b9be6f18SBernard Metzler rv = -EINVAL; 830b9be6f18SBernard Metzler goto tx_error; 831b9be6f18SBernard Metzler } 832b9be6f18SBernard Metzler wqe->sqe.sge[0].laddr = (u64)&wqe->sqe.sge[1]; 833b9be6f18SBernard Metzler } 834b9be6f18SBernard Metzler } 835b9be6f18SBernard Metzler wqe->wr_status = SIW_WR_INPROGRESS; 836b9be6f18SBernard Metzler wqe->processed = 0; 837b9be6f18SBernard Metzler 838b9be6f18SBernard Metzler siw_update_tcpseg(c_tx, s); 839b9be6f18SBernard Metzler 840b9be6f18SBernard Metzler rv = siw_qp_prepare_tx(c_tx); 841b9be6f18SBernard Metzler if (rv == PKT_FRAGMENTED) { 842b9be6f18SBernard Metzler c_tx->state = SIW_SEND_HDR; 843b9be6f18SBernard Metzler siw_prepare_fpdu(qp, wqe); 844b9be6f18SBernard Metzler } else if (rv == PKT_COMPLETE) { 845b9be6f18SBernard Metzler c_tx->state = SIW_SEND_SHORT_FPDU; 846b9be6f18SBernard Metzler } else { 847b9be6f18SBernard Metzler goto tx_error; 848b9be6f18SBernard Metzler } 849b9be6f18SBernard Metzler } 850b9be6f18SBernard Metzler 851b9be6f18SBernard Metzler next_segment: 852b9be6f18SBernard Metzler siw_dbg_qp(qp, "wr type %d, state %d, data %u, sent %u, id %llx\n", 853b9be6f18SBernard Metzler tx_type(wqe), wqe->wr_status, wqe->bytes, wqe->processed, 854b9be6f18SBernard Metzler wqe->sqe.id); 855b9be6f18SBernard Metzler 856b9be6f18SBernard Metzler if (--burst_len == 0) { 857b9be6f18SBernard Metzler rv = -EINPROGRESS; 858b9be6f18SBernard Metzler goto tx_done; 859b9be6f18SBernard Metzler } 860b9be6f18SBernard Metzler if (c_tx->state == SIW_SEND_SHORT_FPDU) { 861b9be6f18SBernard Metzler enum siw_opcode tx_type = tx_type(wqe); 862b9be6f18SBernard Metzler unsigned int msg_flags; 863b9be6f18SBernard Metzler 864b9be6f18SBernard Metzler if (siw_sq_empty(qp) || !siw_tcp_nagle || burst_len == 1) 865b9be6f18SBernard Metzler /* 866b9be6f18SBernard Metzler * End current TCP segment, if SQ runs empty, 867b9be6f18SBernard Metzler * or siw_tcp_nagle is not set, or we bail out 868b9be6f18SBernard Metzler * soon due to no burst credit left. 869b9be6f18SBernard Metzler */ 870b9be6f18SBernard Metzler msg_flags = MSG_DONTWAIT; 871b9be6f18SBernard Metzler else 872b9be6f18SBernard Metzler msg_flags = MSG_DONTWAIT | MSG_MORE; 873b9be6f18SBernard Metzler 874b9be6f18SBernard Metzler rv = siw_tx_ctrl(c_tx, s, msg_flags); 875b9be6f18SBernard Metzler 876b9be6f18SBernard Metzler if (!rv && tx_type != SIW_OP_READ && 877b9be6f18SBernard Metzler tx_type != SIW_OP_READ_LOCAL_INV) 878b9be6f18SBernard Metzler wqe->processed = wqe->bytes; 879b9be6f18SBernard Metzler 880b9be6f18SBernard Metzler goto tx_done; 881b9be6f18SBernard Metzler 882b9be6f18SBernard Metzler } else { 883b9be6f18SBernard Metzler rv = siw_tx_hdt(c_tx, s); 884b9be6f18SBernard Metzler } 885b9be6f18SBernard Metzler if (!rv) { 886b9be6f18SBernard Metzler /* 887b9be6f18SBernard Metzler * One segment sent. Processing completed if last 888b9be6f18SBernard Metzler * segment, Do next segment otherwise. 889b9be6f18SBernard Metzler */ 890b9be6f18SBernard Metzler if (unlikely(c_tx->tx_suspend)) { 891b9be6f18SBernard Metzler /* 892b9be6f18SBernard Metzler * Verbs, 6.4.: Try stopping sending after a full 893b9be6f18SBernard Metzler * DDP segment if the connection goes down 894b9be6f18SBernard Metzler * (== peer halfclose) 895b9be6f18SBernard Metzler */ 896b9be6f18SBernard Metzler rv = -ECONNABORTED; 897b9be6f18SBernard Metzler goto tx_done; 898b9be6f18SBernard Metzler } 899b9be6f18SBernard Metzler if (c_tx->pkt.ctrl.ddp_rdmap_ctrl & DDP_FLAG_LAST) { 900b9be6f18SBernard Metzler siw_dbg_qp(qp, "WQE completed\n"); 901b9be6f18SBernard Metzler goto tx_done; 902b9be6f18SBernard Metzler } 903b9be6f18SBernard Metzler c_tx->state = SIW_SEND_HDR; 904b9be6f18SBernard Metzler 905b9be6f18SBernard Metzler siw_update_tcpseg(c_tx, s); 906b9be6f18SBernard Metzler 907b9be6f18SBernard Metzler siw_prepare_fpdu(qp, wqe); 908b9be6f18SBernard Metzler goto next_segment; 909b9be6f18SBernard Metzler } 910b9be6f18SBernard Metzler tx_done: 911b9be6f18SBernard Metzler qp->tx_ctx.burst = burst_len; 912b9be6f18SBernard Metzler return rv; 913b9be6f18SBernard Metzler 914b9be6f18SBernard Metzler tx_error: 915b9be6f18SBernard Metzler if (ecode != RDMAP_ECODE_CATASTROPHIC_STREAM) 916b9be6f18SBernard Metzler siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP, 917b9be6f18SBernard Metzler RDMAP_ETYPE_REMOTE_PROTECTION, ecode, 1); 918b9be6f18SBernard Metzler else 919b9be6f18SBernard Metzler siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP, 920b9be6f18SBernard Metzler RDMAP_ETYPE_CATASTROPHIC, 921b9be6f18SBernard Metzler RDMAP_ECODE_UNSPECIFIED, 1); 922b9be6f18SBernard Metzler return rv; 923b9be6f18SBernard Metzler } 924b9be6f18SBernard Metzler 925b9be6f18SBernard Metzler static int siw_fastreg_mr(struct ib_pd *pd, struct siw_sqe *sqe) 926b9be6f18SBernard Metzler { 927b9be6f18SBernard Metzler struct ib_mr *base_mr = (struct ib_mr *)sqe->base_mr; 928b9be6f18SBernard Metzler struct siw_device *sdev = to_siw_dev(pd->device); 929b9be6f18SBernard Metzler struct siw_mem *mem = siw_mem_id2obj(sdev, sqe->rkey >> 8); 930b9be6f18SBernard Metzler int rv = 0; 931b9be6f18SBernard Metzler 932b9be6f18SBernard Metzler siw_dbg_pd(pd, "STag 0x%08x\n", sqe->rkey); 933b9be6f18SBernard Metzler 934b9be6f18SBernard Metzler if (unlikely(!mem || !base_mr)) { 935b9be6f18SBernard Metzler pr_warn("siw: fastreg: STag 0x%08x unknown\n", sqe->rkey); 936b9be6f18SBernard Metzler return -EINVAL; 937b9be6f18SBernard Metzler } 938b9be6f18SBernard Metzler if (unlikely(base_mr->rkey >> 8 != sqe->rkey >> 8)) { 939b9be6f18SBernard Metzler pr_warn("siw: fastreg: STag 0x%08x: bad MR\n", sqe->rkey); 940b9be6f18SBernard Metzler rv = -EINVAL; 941b9be6f18SBernard Metzler goto out; 942b9be6f18SBernard Metzler } 943b9be6f18SBernard Metzler if (unlikely(mem->pd != pd)) { 944b9be6f18SBernard Metzler pr_warn("siw: fastreg: PD mismatch\n"); 945b9be6f18SBernard Metzler rv = -EINVAL; 946b9be6f18SBernard Metzler goto out; 947b9be6f18SBernard Metzler } 948b9be6f18SBernard Metzler if (unlikely(mem->stag_valid)) { 949b9be6f18SBernard Metzler pr_warn("siw: fastreg: STag 0x%08x already valid\n", sqe->rkey); 950b9be6f18SBernard Metzler rv = -EINVAL; 951b9be6f18SBernard Metzler goto out; 952b9be6f18SBernard Metzler } 953b9be6f18SBernard Metzler /* Refresh STag since user may have changed key part */ 954b9be6f18SBernard Metzler mem->stag = sqe->rkey; 955b9be6f18SBernard Metzler mem->perms = sqe->access; 956b9be6f18SBernard Metzler 957b9be6f18SBernard Metzler siw_dbg_mem(mem, "STag now valid, MR va: 0x%016llx -> 0x%016llx\n", 958b9be6f18SBernard Metzler mem->va, base_mr->iova); 959b9be6f18SBernard Metzler mem->va = base_mr->iova; 960b9be6f18SBernard Metzler mem->stag_valid = 1; 961b9be6f18SBernard Metzler out: 962b9be6f18SBernard Metzler siw_mem_put(mem); 963b9be6f18SBernard Metzler return rv; 964b9be6f18SBernard Metzler } 965b9be6f18SBernard Metzler 966b9be6f18SBernard Metzler static int siw_qp_sq_proc_local(struct siw_qp *qp, struct siw_wqe *wqe) 967b9be6f18SBernard Metzler { 968b9be6f18SBernard Metzler int rv; 969b9be6f18SBernard Metzler 970b9be6f18SBernard Metzler switch (tx_type(wqe)) { 971b9be6f18SBernard Metzler case SIW_OP_REG_MR: 972b9be6f18SBernard Metzler rv = siw_fastreg_mr(qp->pd, &wqe->sqe); 973b9be6f18SBernard Metzler break; 974b9be6f18SBernard Metzler 975b9be6f18SBernard Metzler case SIW_OP_INVAL_STAG: 976b9be6f18SBernard Metzler rv = siw_invalidate_stag(qp->pd, wqe->sqe.rkey); 977b9be6f18SBernard Metzler break; 978b9be6f18SBernard Metzler 979b9be6f18SBernard Metzler default: 980b9be6f18SBernard Metzler rv = -EINVAL; 981b9be6f18SBernard Metzler } 982b9be6f18SBernard Metzler return rv; 983b9be6f18SBernard Metzler } 984b9be6f18SBernard Metzler 985b9be6f18SBernard Metzler /* 986b9be6f18SBernard Metzler * siw_qp_sq_process() 987b9be6f18SBernard Metzler * 988b9be6f18SBernard Metzler * Core TX path routine for RDMAP/DDP/MPA using a TCP kernel socket. 989b9be6f18SBernard Metzler * Sends RDMAP payload for the current SQ WR @wqe of @qp in one or more 990b9be6f18SBernard Metzler * MPA FPDUs, each containing a DDP segment. 991b9be6f18SBernard Metzler * 992b9be6f18SBernard Metzler * SQ processing may occur in user context as a result of posting 993b9be6f18SBernard Metzler * new WQE's or from siw_sq_work_handler() context. Processing in 994b9be6f18SBernard Metzler * user context is limited to non-kernel verbs users. 995b9be6f18SBernard Metzler * 996b9be6f18SBernard Metzler * SQ processing may get paused anytime, possibly in the middle of a WR 997b9be6f18SBernard Metzler * or FPDU, if insufficient send space is available. SQ processing 998b9be6f18SBernard Metzler * gets resumed from siw_sq_work_handler(), if send space becomes 999b9be6f18SBernard Metzler * available again. 1000b9be6f18SBernard Metzler * 1001b9be6f18SBernard Metzler * Must be called with the QP state read-locked. 1002b9be6f18SBernard Metzler * 1003b9be6f18SBernard Metzler * Note: 1004b9be6f18SBernard Metzler * An outbound RREQ can be satisfied by the corresponding RRESP 1005b9be6f18SBernard Metzler * _before_ it gets assigned to the ORQ. This happens regularly 1006b9be6f18SBernard Metzler * in RDMA READ via loopback case. Since both outbound RREQ and 1007b9be6f18SBernard Metzler * inbound RRESP can be handled by the same CPU, locking the ORQ 1008b9be6f18SBernard Metzler * is dead-lock prone and thus not an option. With that, the 1009b9be6f18SBernard Metzler * RREQ gets assigned to the ORQ _before_ being sent - see 1010b9be6f18SBernard Metzler * siw_activate_tx() - and pulled back in case of send failure. 1011b9be6f18SBernard Metzler */ 1012b9be6f18SBernard Metzler int siw_qp_sq_process(struct siw_qp *qp) 1013b9be6f18SBernard Metzler { 1014b9be6f18SBernard Metzler struct siw_wqe *wqe = tx_wqe(qp); 1015b9be6f18SBernard Metzler enum siw_opcode tx_type; 1016b9be6f18SBernard Metzler unsigned long flags; 1017b9be6f18SBernard Metzler int rv = 0; 1018b9be6f18SBernard Metzler 1019b9be6f18SBernard Metzler siw_dbg_qp(qp, "enter for type %d\n", tx_type(wqe)); 1020b9be6f18SBernard Metzler 1021b9be6f18SBernard Metzler next_wqe: 1022b9be6f18SBernard Metzler /* 1023b9be6f18SBernard Metzler * Stop QP processing if SQ state changed 1024b9be6f18SBernard Metzler */ 1025b9be6f18SBernard Metzler if (unlikely(qp->tx_ctx.tx_suspend)) { 1026b9be6f18SBernard Metzler siw_dbg_qp(qp, "tx suspended\n"); 1027b9be6f18SBernard Metzler goto done; 1028b9be6f18SBernard Metzler } 1029b9be6f18SBernard Metzler tx_type = tx_type(wqe); 1030b9be6f18SBernard Metzler 1031b9be6f18SBernard Metzler if (tx_type <= SIW_OP_READ_RESPONSE) 1032b9be6f18SBernard Metzler rv = siw_qp_sq_proc_tx(qp, wqe); 1033b9be6f18SBernard Metzler else 1034b9be6f18SBernard Metzler rv = siw_qp_sq_proc_local(qp, wqe); 1035b9be6f18SBernard Metzler 1036b9be6f18SBernard Metzler if (!rv) { 1037b9be6f18SBernard Metzler /* 1038b9be6f18SBernard Metzler * WQE processing done 1039b9be6f18SBernard Metzler */ 1040b9be6f18SBernard Metzler switch (tx_type) { 1041b9be6f18SBernard Metzler case SIW_OP_SEND: 1042b9be6f18SBernard Metzler case SIW_OP_SEND_REMOTE_INV: 1043b9be6f18SBernard Metzler case SIW_OP_WRITE: 1044b9be6f18SBernard Metzler siw_wqe_put_mem(wqe, tx_type); 1045b9be6f18SBernard Metzler case SIW_OP_INVAL_STAG: 1046b9be6f18SBernard Metzler case SIW_OP_REG_MR: 1047b9be6f18SBernard Metzler if (tx_flags(wqe) & SIW_WQE_SIGNALLED) 1048b9be6f18SBernard Metzler siw_sqe_complete(qp, &wqe->sqe, wqe->bytes, 1049b9be6f18SBernard Metzler SIW_WC_SUCCESS); 1050b9be6f18SBernard Metzler break; 1051b9be6f18SBernard Metzler 1052b9be6f18SBernard Metzler case SIW_OP_READ: 1053b9be6f18SBernard Metzler case SIW_OP_READ_LOCAL_INV: 1054b9be6f18SBernard Metzler /* 1055b9be6f18SBernard Metzler * already enqueued to ORQ queue 1056b9be6f18SBernard Metzler */ 1057b9be6f18SBernard Metzler break; 1058b9be6f18SBernard Metzler 1059b9be6f18SBernard Metzler case SIW_OP_READ_RESPONSE: 1060b9be6f18SBernard Metzler siw_wqe_put_mem(wqe, tx_type); 1061b9be6f18SBernard Metzler break; 1062b9be6f18SBernard Metzler 1063b9be6f18SBernard Metzler default: 1064b9be6f18SBernard Metzler WARN(1, "undefined WQE type %d\n", tx_type); 1065b9be6f18SBernard Metzler rv = -EINVAL; 1066b9be6f18SBernard Metzler goto done; 1067b9be6f18SBernard Metzler } 1068b9be6f18SBernard Metzler 1069b9be6f18SBernard Metzler spin_lock_irqsave(&qp->sq_lock, flags); 1070b9be6f18SBernard Metzler wqe->wr_status = SIW_WR_IDLE; 1071b9be6f18SBernard Metzler rv = siw_activate_tx(qp); 1072b9be6f18SBernard Metzler spin_unlock_irqrestore(&qp->sq_lock, flags); 1073b9be6f18SBernard Metzler 1074b9be6f18SBernard Metzler if (rv <= 0) 1075b9be6f18SBernard Metzler goto done; 1076b9be6f18SBernard Metzler 1077b9be6f18SBernard Metzler goto next_wqe; 1078b9be6f18SBernard Metzler 1079b9be6f18SBernard Metzler } else if (rv == -EAGAIN) { 1080b9be6f18SBernard Metzler siw_dbg_qp(qp, "sq paused: hd/tr %d of %d, data %d\n", 1081b9be6f18SBernard Metzler qp->tx_ctx.ctrl_sent, qp->tx_ctx.ctrl_len, 1082b9be6f18SBernard Metzler qp->tx_ctx.bytes_unsent); 1083b9be6f18SBernard Metzler rv = 0; 1084b9be6f18SBernard Metzler goto done; 1085b9be6f18SBernard Metzler } else if (rv == -EINPROGRESS) { 1086b9be6f18SBernard Metzler rv = siw_sq_start(qp); 1087b9be6f18SBernard Metzler goto done; 1088b9be6f18SBernard Metzler } else { 1089b9be6f18SBernard Metzler /* 1090b9be6f18SBernard Metzler * WQE processing failed. 1091b9be6f18SBernard Metzler * Verbs 8.3.2: 1092b9be6f18SBernard Metzler * o It turns any WQE into a signalled WQE. 1093b9be6f18SBernard Metzler * o Local catastrophic error must be surfaced 1094b9be6f18SBernard Metzler * o QP must be moved into Terminate state: done by code 1095b9be6f18SBernard Metzler * doing socket state change processing 1096b9be6f18SBernard Metzler * 1097b9be6f18SBernard Metzler * o TODO: Termination message must be sent. 1098b9be6f18SBernard Metzler * o TODO: Implement more precise work completion errors, 1099b9be6f18SBernard Metzler * see enum ib_wc_status in ib_verbs.h 1100b9be6f18SBernard Metzler */ 1101b9be6f18SBernard Metzler siw_dbg_qp(qp, "wqe type %d processing failed: %d\n", 1102b9be6f18SBernard Metzler tx_type(wqe), rv); 1103b9be6f18SBernard Metzler 1104b9be6f18SBernard Metzler spin_lock_irqsave(&qp->sq_lock, flags); 1105b9be6f18SBernard Metzler /* 1106b9be6f18SBernard Metzler * RREQ may have already been completed by inbound RRESP! 1107b9be6f18SBernard Metzler */ 1108b9be6f18SBernard Metzler if (tx_type == SIW_OP_READ || 1109b9be6f18SBernard Metzler tx_type == SIW_OP_READ_LOCAL_INV) { 1110b9be6f18SBernard Metzler /* Cleanup pending entry in ORQ */ 1111b9be6f18SBernard Metzler qp->orq_put--; 1112b9be6f18SBernard Metzler qp->orq[qp->orq_put % qp->attrs.orq_size].flags = 0; 1113b9be6f18SBernard Metzler } 1114b9be6f18SBernard Metzler spin_unlock_irqrestore(&qp->sq_lock, flags); 1115b9be6f18SBernard Metzler /* 1116b9be6f18SBernard Metzler * immediately suspends further TX processing 1117b9be6f18SBernard Metzler */ 1118b9be6f18SBernard Metzler if (!qp->tx_ctx.tx_suspend) 1119b9be6f18SBernard Metzler siw_qp_cm_drop(qp, 0); 1120b9be6f18SBernard Metzler 1121b9be6f18SBernard Metzler switch (tx_type) { 1122b9be6f18SBernard Metzler case SIW_OP_SEND: 1123b9be6f18SBernard Metzler case SIW_OP_SEND_REMOTE_INV: 1124b9be6f18SBernard Metzler case SIW_OP_SEND_WITH_IMM: 1125b9be6f18SBernard Metzler case SIW_OP_WRITE: 1126b9be6f18SBernard Metzler case SIW_OP_READ: 1127b9be6f18SBernard Metzler case SIW_OP_READ_LOCAL_INV: 1128b9be6f18SBernard Metzler siw_wqe_put_mem(wqe, tx_type); 1129b9be6f18SBernard Metzler case SIW_OP_INVAL_STAG: 1130b9be6f18SBernard Metzler case SIW_OP_REG_MR: 1131b9be6f18SBernard Metzler siw_sqe_complete(qp, &wqe->sqe, wqe->bytes, 1132b9be6f18SBernard Metzler SIW_WC_LOC_QP_OP_ERR); 1133b9be6f18SBernard Metzler 1134b9be6f18SBernard Metzler siw_qp_event(qp, IB_EVENT_QP_FATAL); 1135b9be6f18SBernard Metzler 1136b9be6f18SBernard Metzler break; 1137b9be6f18SBernard Metzler 1138b9be6f18SBernard Metzler case SIW_OP_READ_RESPONSE: 1139b9be6f18SBernard Metzler siw_dbg_qp(qp, "proc. read.response failed: %d\n", rv); 1140b9be6f18SBernard Metzler 1141b9be6f18SBernard Metzler siw_qp_event(qp, IB_EVENT_QP_REQ_ERR); 1142b9be6f18SBernard Metzler 1143b9be6f18SBernard Metzler siw_wqe_put_mem(wqe, SIW_OP_READ_RESPONSE); 1144b9be6f18SBernard Metzler 1145b9be6f18SBernard Metzler break; 1146b9be6f18SBernard Metzler 1147b9be6f18SBernard Metzler default: 1148b9be6f18SBernard Metzler WARN(1, "undefined WQE type %d\n", tx_type); 1149b9be6f18SBernard Metzler rv = -EINVAL; 1150b9be6f18SBernard Metzler } 1151b9be6f18SBernard Metzler wqe->wr_status = SIW_WR_IDLE; 1152b9be6f18SBernard Metzler } 1153b9be6f18SBernard Metzler done: 1154b9be6f18SBernard Metzler return rv; 1155b9be6f18SBernard Metzler } 1156b9be6f18SBernard Metzler 1157b9be6f18SBernard Metzler static void siw_sq_resume(struct siw_qp *qp) 1158b9be6f18SBernard Metzler { 1159b9be6f18SBernard Metzler if (down_read_trylock(&qp->state_lock)) { 1160b9be6f18SBernard Metzler if (likely(qp->attrs.state == SIW_QP_STATE_RTS && 1161b9be6f18SBernard Metzler !qp->tx_ctx.tx_suspend)) { 1162b9be6f18SBernard Metzler int rv = siw_qp_sq_process(qp); 1163b9be6f18SBernard Metzler 1164b9be6f18SBernard Metzler up_read(&qp->state_lock); 1165b9be6f18SBernard Metzler 1166b9be6f18SBernard Metzler if (unlikely(rv < 0)) { 1167b9be6f18SBernard Metzler siw_dbg_qp(qp, "SQ task failed: err %d\n", rv); 1168b9be6f18SBernard Metzler 1169b9be6f18SBernard Metzler if (!qp->tx_ctx.tx_suspend) 1170b9be6f18SBernard Metzler siw_qp_cm_drop(qp, 0); 1171b9be6f18SBernard Metzler } 1172b9be6f18SBernard Metzler } else { 1173b9be6f18SBernard Metzler up_read(&qp->state_lock); 1174b9be6f18SBernard Metzler } 1175b9be6f18SBernard Metzler } else { 1176b9be6f18SBernard Metzler siw_dbg_qp(qp, "Resume SQ while QP locked\n"); 1177b9be6f18SBernard Metzler } 1178b9be6f18SBernard Metzler siw_qp_put(qp); 1179b9be6f18SBernard Metzler } 1180b9be6f18SBernard Metzler 1181b9be6f18SBernard Metzler struct tx_task_t { 1182b9be6f18SBernard Metzler struct llist_head active; 1183b9be6f18SBernard Metzler wait_queue_head_t waiting; 1184b9be6f18SBernard Metzler }; 1185b9be6f18SBernard Metzler 1186b9be6f18SBernard Metzler static DEFINE_PER_CPU(struct tx_task_t, tx_task_g); 1187b9be6f18SBernard Metzler 1188b9be6f18SBernard Metzler void siw_stop_tx_thread(int nr_cpu) 1189b9be6f18SBernard Metzler { 1190b9be6f18SBernard Metzler kthread_stop(siw_tx_thread[nr_cpu]); 1191b9be6f18SBernard Metzler wake_up(&per_cpu(tx_task_g, nr_cpu).waiting); 1192b9be6f18SBernard Metzler } 1193b9be6f18SBernard Metzler 1194b9be6f18SBernard Metzler int siw_run_sq(void *data) 1195b9be6f18SBernard Metzler { 1196b9be6f18SBernard Metzler const int nr_cpu = (unsigned int)(long)data; 1197b9be6f18SBernard Metzler struct llist_node *active; 1198b9be6f18SBernard Metzler struct siw_qp *qp; 1199b9be6f18SBernard Metzler struct tx_task_t *tx_task = &per_cpu(tx_task_g, nr_cpu); 1200b9be6f18SBernard Metzler 1201b9be6f18SBernard Metzler init_llist_head(&tx_task->active); 1202b9be6f18SBernard Metzler init_waitqueue_head(&tx_task->waiting); 1203b9be6f18SBernard Metzler 1204b9be6f18SBernard Metzler pr_info("Started siw TX thread on CPU %u\n", nr_cpu); 1205b9be6f18SBernard Metzler 1206b9be6f18SBernard Metzler while (1) { 1207b9be6f18SBernard Metzler struct llist_node *fifo_list = NULL; 1208b9be6f18SBernard Metzler 1209b9be6f18SBernard Metzler wait_event_interruptible(tx_task->waiting, 1210b9be6f18SBernard Metzler !llist_empty(&tx_task->active) || 1211b9be6f18SBernard Metzler kthread_should_stop()); 1212b9be6f18SBernard Metzler 1213b9be6f18SBernard Metzler if (kthread_should_stop()) 1214b9be6f18SBernard Metzler break; 1215b9be6f18SBernard Metzler 1216b9be6f18SBernard Metzler active = llist_del_all(&tx_task->active); 1217b9be6f18SBernard Metzler /* 1218b9be6f18SBernard Metzler * llist_del_all returns a list with newest entry first. 1219b9be6f18SBernard Metzler * Re-order list for fairness among QP's. 1220b9be6f18SBernard Metzler */ 1221b9be6f18SBernard Metzler while (active) { 1222b9be6f18SBernard Metzler struct llist_node *tmp = active; 1223b9be6f18SBernard Metzler 1224b9be6f18SBernard Metzler active = llist_next(active); 1225b9be6f18SBernard Metzler tmp->next = fifo_list; 1226b9be6f18SBernard Metzler fifo_list = tmp; 1227b9be6f18SBernard Metzler } 1228b9be6f18SBernard Metzler while (fifo_list) { 1229b9be6f18SBernard Metzler qp = container_of(fifo_list, struct siw_qp, tx_list); 1230b9be6f18SBernard Metzler fifo_list = llist_next(fifo_list); 1231b9be6f18SBernard Metzler qp->tx_list.next = NULL; 1232b9be6f18SBernard Metzler 1233b9be6f18SBernard Metzler siw_sq_resume(qp); 1234b9be6f18SBernard Metzler } 1235b9be6f18SBernard Metzler } 1236b9be6f18SBernard Metzler active = llist_del_all(&tx_task->active); 1237b9be6f18SBernard Metzler if (active) { 1238b9be6f18SBernard Metzler llist_for_each_entry(qp, active, tx_list) { 1239b9be6f18SBernard Metzler qp->tx_list.next = NULL; 1240b9be6f18SBernard Metzler siw_sq_resume(qp); 1241b9be6f18SBernard Metzler } 1242b9be6f18SBernard Metzler } 1243b9be6f18SBernard Metzler pr_info("Stopped siw TX thread on CPU %u\n", nr_cpu); 1244b9be6f18SBernard Metzler 1245b9be6f18SBernard Metzler return 0; 1246b9be6f18SBernard Metzler } 1247b9be6f18SBernard Metzler 1248b9be6f18SBernard Metzler int siw_sq_start(struct siw_qp *qp) 1249b9be6f18SBernard Metzler { 1250b9be6f18SBernard Metzler if (tx_wqe(qp)->wr_status == SIW_WR_IDLE) 1251b9be6f18SBernard Metzler return 0; 1252b9be6f18SBernard Metzler 1253b9be6f18SBernard Metzler if (unlikely(!cpu_online(qp->tx_cpu))) { 1254b9be6f18SBernard Metzler siw_put_tx_cpu(qp->tx_cpu); 1255b9be6f18SBernard Metzler qp->tx_cpu = siw_get_tx_cpu(qp->sdev); 1256b9be6f18SBernard Metzler if (qp->tx_cpu < 0) { 1257b9be6f18SBernard Metzler pr_warn("siw: no tx cpu available\n"); 1258b9be6f18SBernard Metzler 1259b9be6f18SBernard Metzler return -EIO; 1260b9be6f18SBernard Metzler } 1261b9be6f18SBernard Metzler } 1262b9be6f18SBernard Metzler siw_qp_get(qp); 1263b9be6f18SBernard Metzler 1264b9be6f18SBernard Metzler llist_add(&qp->tx_list, &per_cpu(tx_task_g, qp->tx_cpu).active); 1265b9be6f18SBernard Metzler 1266b9be6f18SBernard Metzler wake_up(&per_cpu(tx_task_g, qp->tx_cpu).waiting); 1267b9be6f18SBernard Metzler 1268b9be6f18SBernard Metzler return 0; 1269b9be6f18SBernard Metzler } 1270