1159d2131STariq Toukan /* 2159d2131STariq Toukan * Copyright (c) 2018, Mellanox Technologies. All rights reserved. 3159d2131STariq Toukan * 4159d2131STariq Toukan * This software is available to you under a choice of one of two 5159d2131STariq Toukan * licenses. You may choose to be licensed under the terms of the GNU 6159d2131STariq Toukan * General Public License (GPL) Version 2, available from the file 7159d2131STariq Toukan * COPYING in the main directory of this source tree, or the 8159d2131STariq Toukan * OpenIB.org BSD license below: 9159d2131STariq Toukan * 10159d2131STariq Toukan * Redistribution and use in source and binary forms, with or 11159d2131STariq Toukan * without modification, are permitted provided that the following 12159d2131STariq Toukan * conditions are met: 13159d2131STariq Toukan * 14159d2131STariq Toukan * - Redistributions of source code must retain the above 15159d2131STariq Toukan * copyright notice, this list of conditions and the following 16159d2131STariq Toukan * disclaimer. 17159d2131STariq Toukan * 18159d2131STariq Toukan * - Redistributions in binary form must reproduce the above 19159d2131STariq Toukan * copyright notice, this list of conditions and the following 20159d2131STariq Toukan * disclaimer in the documentation and/or other materials 21159d2131STariq Toukan * provided with the distribution. 22159d2131STariq Toukan * 23159d2131STariq Toukan * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24159d2131STariq Toukan * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25159d2131STariq Toukan * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26159d2131STariq Toukan * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27159d2131STariq Toukan * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28159d2131STariq Toukan * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29159d2131STariq Toukan * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30159d2131STariq Toukan * SOFTWARE. 31159d2131STariq Toukan */ 32159d2131STariq Toukan 33159d2131STariq Toukan #include <linux/bpf_trace.h> 34a71506a4SMagnus Karlsson #include <net/xdp_sock_drv.h> 35159d2131STariq Toukan #include "en/xdp.h" 36a011b49fSMaxim Mikityanskiy #include "en/params.h" 37159d2131STariq Toukan 38a011b49fSMaxim Mikityanskiy int mlx5e_xdp_max_mtu(struct mlx5e_params *params, struct mlx5e_xsk_param *xsk) 39d460c271SMaxim Mikityanskiy { 40a011b49fSMaxim Mikityanskiy int hr = mlx5e_get_linear_rq_headroom(params, xsk); 41d460c271SMaxim Mikityanskiy 42d460c271SMaxim Mikityanskiy /* Let S := SKB_DATA_ALIGN(sizeof(struct skb_shared_info)). 43d460c271SMaxim Mikityanskiy * The condition checked in mlx5e_rx_is_linear_skb is: 44d460c271SMaxim Mikityanskiy * SKB_DATA_ALIGN(sw_mtu + hard_mtu + hr) + S <= PAGE_SIZE (1) 45d460c271SMaxim Mikityanskiy * (Note that hw_mtu == sw_mtu + hard_mtu.) 46d460c271SMaxim Mikityanskiy * What is returned from this function is: 47d460c271SMaxim Mikityanskiy * max_mtu = PAGE_SIZE - S - hr - hard_mtu (2) 48d460c271SMaxim Mikityanskiy * After assigning sw_mtu := max_mtu, the left side of (1) turns to 49d460c271SMaxim Mikityanskiy * SKB_DATA_ALIGN(PAGE_SIZE - S) + S, which is equal to PAGE_SIZE, 50d460c271SMaxim Mikityanskiy * because both PAGE_SIZE and S are already aligned. Any number greater 51d460c271SMaxim Mikityanskiy * than max_mtu would make the left side of (1) greater than PAGE_SIZE, 52d460c271SMaxim Mikityanskiy * so max_mtu is the maximum MTU allowed. 53d460c271SMaxim Mikityanskiy */ 54d460c271SMaxim Mikityanskiy 55d460c271SMaxim Mikityanskiy return MLX5E_HW2SW_MTU(params, SKB_MAX_HEAD(hr)); 56d460c271SMaxim Mikityanskiy } 57d460c271SMaxim Mikityanskiy 58c94e4f11STariq Toukan static inline bool 59b9673cf5SMaxim Mikityanskiy mlx5e_xmit_xdp_buff(struct mlx5e_xdpsq *sq, struct mlx5e_rq *rq, 60b9673cf5SMaxim Mikityanskiy struct mlx5e_dma_info *di, struct xdp_buff *xdp) 61c94e4f11STariq Toukan { 62d963fa15SMaxim Mikityanskiy struct mlx5e_xdp_xmit_data xdptxd; 63c94e4f11STariq Toukan struct mlx5e_xdp_info xdpi; 64d963fa15SMaxim Mikityanskiy struct xdp_frame *xdpf; 65d963fa15SMaxim Mikityanskiy dma_addr_t dma_addr; 66c94e4f11STariq Toukan 671b698fa5SLorenzo Bianconi xdpf = xdp_convert_buff_to_frame(xdp); 68d963fa15SMaxim Mikityanskiy if (unlikely(!xdpf)) 69c94e4f11STariq Toukan return false; 70c94e4f11STariq Toukan 71d963fa15SMaxim Mikityanskiy xdptxd.data = xdpf->data; 72d963fa15SMaxim Mikityanskiy xdptxd.len = xdpf->len; 73d963fa15SMaxim Mikityanskiy 7439d6443cSBjörn Töpel if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL) { 7584a0a231SMaxim Mikityanskiy /* The xdp_buff was in the UMEM and was copied into a newly 7684a0a231SMaxim Mikityanskiy * allocated page. The UMEM page was returned via the ZCA, and 7784a0a231SMaxim Mikityanskiy * this new page has to be mapped at this point and has to be 7884a0a231SMaxim Mikityanskiy * unmapped and returned via xdp_return_frame on completion. 7984a0a231SMaxim Mikityanskiy */ 8084a0a231SMaxim Mikityanskiy 8184a0a231SMaxim Mikityanskiy /* Prevent double recycling of the UMEM page. Even in case this 8284a0a231SMaxim Mikityanskiy * function returns false, the xdp_buff shouldn't be recycled, 8384a0a231SMaxim Mikityanskiy * as it was already done in xdp_convert_zc_to_xdp_frame. 8484a0a231SMaxim Mikityanskiy */ 8584a0a231SMaxim Mikityanskiy __set_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags); /* non-atomic */ 8684a0a231SMaxim Mikityanskiy 8784a0a231SMaxim Mikityanskiy xdpi.mode = MLX5E_XDP_XMIT_MODE_FRAME; 8884a0a231SMaxim Mikityanskiy 8984a0a231SMaxim Mikityanskiy dma_addr = dma_map_single(sq->pdev, xdptxd.data, xdptxd.len, 9084a0a231SMaxim Mikityanskiy DMA_TO_DEVICE); 9184a0a231SMaxim Mikityanskiy if (dma_mapping_error(sq->pdev, dma_addr)) { 9284a0a231SMaxim Mikityanskiy xdp_return_frame(xdpf); 9384a0a231SMaxim Mikityanskiy return false; 9484a0a231SMaxim Mikityanskiy } 9584a0a231SMaxim Mikityanskiy 9684a0a231SMaxim Mikityanskiy xdptxd.dma_addr = dma_addr; 9784a0a231SMaxim Mikityanskiy xdpi.frame.xdpf = xdpf; 9884a0a231SMaxim Mikityanskiy xdpi.frame.dma_addr = dma_addr; 9984a0a231SMaxim Mikityanskiy } else { 1001b698fa5SLorenzo Bianconi /* Driver assumes that xdp_convert_buff_to_frame returns 1011b698fa5SLorenzo Bianconi * an xdp_frame that points to the same memory region as 1021b698fa5SLorenzo Bianconi * the original xdp_buff. It allows to map the memory only 1031b698fa5SLorenzo Bianconi * once and to use the DMA_BIDIRECTIONAL mode. 10484a0a231SMaxim Mikityanskiy */ 10584a0a231SMaxim Mikityanskiy 106d963fa15SMaxim Mikityanskiy xdpi.mode = MLX5E_XDP_XMIT_MODE_PAGE; 107d963fa15SMaxim Mikityanskiy 108d963fa15SMaxim Mikityanskiy dma_addr = di->addr + (xdpf->data - (void *)xdpf); 10984a0a231SMaxim Mikityanskiy dma_sync_single_for_device(sq->pdev, dma_addr, xdptxd.len, 11084a0a231SMaxim Mikityanskiy DMA_TO_DEVICE); 111d963fa15SMaxim Mikityanskiy 112d963fa15SMaxim Mikityanskiy xdptxd.dma_addr = dma_addr; 113b9673cf5SMaxim Mikityanskiy xdpi.page.rq = rq; 114d963fa15SMaxim Mikityanskiy xdpi.page.di = *di; 11584a0a231SMaxim Mikityanskiy } 116d963fa15SMaxim Mikityanskiy 11793761ca1STariq Toukan return INDIRECT_CALL_2(sq->xmit_xdp_frame, mlx5e_xmit_xdp_frame_mpwqe, 11893761ca1STariq Toukan mlx5e_xmit_xdp_frame, sq, &xdptxd, &xdpi, 0); 119c94e4f11STariq Toukan } 120c94e4f11STariq Toukan 121159d2131STariq Toukan /* returns true if packet was consumed by xdp */ 122159d2131STariq Toukan bool mlx5e_xdp_handle(struct mlx5e_rq *rq, struct mlx5e_dma_info *di, 12339d6443cSBjörn Töpel u32 *len, struct xdp_buff *xdp) 124159d2131STariq Toukan { 125159d2131STariq Toukan struct bpf_prog *prog = READ_ONCE(rq->xdp_prog); 126159d2131STariq Toukan u32 act; 127159d2131STariq Toukan int err; 128159d2131STariq Toukan 129159d2131STariq Toukan if (!prog) 130159d2131STariq Toukan return false; 131159d2131STariq Toukan 13239d6443cSBjörn Töpel act = bpf_prog_run_xdp(prog, xdp); 133159d2131STariq Toukan switch (act) { 134159d2131STariq Toukan case XDP_PASS: 13539d6443cSBjörn Töpel *len = xdp->data_end - xdp->data; 136159d2131STariq Toukan return false; 137159d2131STariq Toukan case XDP_TX: 13839d6443cSBjörn Töpel if (unlikely(!mlx5e_xmit_xdp_buff(rq->xdpsq, rq, di, xdp))) 139c94e4f11STariq Toukan goto xdp_abort; 140c94e4f11STariq Toukan __set_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags); /* non-atomic */ 141159d2131STariq Toukan return true; 142159d2131STariq Toukan case XDP_REDIRECT: 143159d2131STariq Toukan /* When XDP enabled then page-refcnt==1 here */ 14439d6443cSBjörn Töpel err = xdp_do_redirect(rq->netdev, xdp, prog); 145c94e4f11STariq Toukan if (unlikely(err)) 146c94e4f11STariq Toukan goto xdp_abort; 147159d2131STariq Toukan __set_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags); 14815143bf5STariq Toukan __set_bit(MLX5E_RQ_FLAG_XDP_REDIRECT, rq->flags); 14939d6443cSBjörn Töpel if (xdp->rxq->mem.type != MEM_TYPE_XSK_BUFF_POOL) 150159d2131STariq Toukan mlx5e_page_dma_unmap(rq, di); 15186690b4bSTariq Toukan rq->stats->xdp_redirect++; 152159d2131STariq Toukan return true; 153159d2131STariq Toukan default: 154159d2131STariq Toukan bpf_warn_invalid_xdp_action(act); 155c8b838d1SGustavo A. R. Silva fallthrough; 156159d2131STariq Toukan case XDP_ABORTED: 157c94e4f11STariq Toukan xdp_abort: 158159d2131STariq Toukan trace_xdp_exception(rq->netdev, prog, act); 159c8b838d1SGustavo A. R. Silva fallthrough; 160159d2131STariq Toukan case XDP_DROP: 161159d2131STariq Toukan rq->stats->xdp_drop++; 162159d2131STariq Toukan return true; 163159d2131STariq Toukan } 164159d2131STariq Toukan } 165159d2131STariq Toukan 166ec9cdca0SMaxim Mikityanskiy static u16 mlx5e_xdpsq_get_next_pi(struct mlx5e_xdpsq *sq, u16 size) 1675e0d2eefSTariq Toukan { 1685e0d2eefSTariq Toukan struct mlx5_wq_cyc *wq = &sq->wq; 1696c085a8aSShay Agroskin u16 pi, contig_wqebbs; 1706c085a8aSShay Agroskin 1716c085a8aSShay Agroskin pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc); 1726c085a8aSShay Agroskin contig_wqebbs = mlx5_wq_cyc_get_contig_wqebbs(wq, pi); 173ec9cdca0SMaxim Mikityanskiy if (unlikely(contig_wqebbs < size)) { 174ec9cdca0SMaxim Mikityanskiy struct mlx5e_xdp_wqe_info *wi, *edge_wi; 1756c085a8aSShay Agroskin 176ec9cdca0SMaxim Mikityanskiy wi = &sq->db.wqe_info[pi]; 177ec9cdca0SMaxim Mikityanskiy edge_wi = wi + contig_wqebbs; 178ec9cdca0SMaxim Mikityanskiy 179ec9cdca0SMaxim Mikityanskiy /* Fill SQ frag edge with NOPs to avoid WQE wrapping two pages. */ 180ec9cdca0SMaxim Mikityanskiy for (; wi < edge_wi; wi++) { 181ec9cdca0SMaxim Mikityanskiy *wi = (struct mlx5e_xdp_wqe_info) { 182ec9cdca0SMaxim Mikityanskiy .num_wqebbs = 1, 183ec9cdca0SMaxim Mikityanskiy .num_pkts = 0, 184ec9cdca0SMaxim Mikityanskiy }; 185ec9cdca0SMaxim Mikityanskiy mlx5e_post_nop(wq, sq->sqn, &sq->pc); 186ec9cdca0SMaxim Mikityanskiy } 187ec9cdca0SMaxim Mikityanskiy sq->stats->nops += contig_wqebbs; 188ec9cdca0SMaxim Mikityanskiy 189fed0c6cfSMaxim Mikityanskiy pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc); 190fed0c6cfSMaxim Mikityanskiy } 1915e0d2eefSTariq Toukan 192ec9cdca0SMaxim Mikityanskiy return pi; 193ec9cdca0SMaxim Mikityanskiy } 194ec9cdca0SMaxim Mikityanskiy 195ec9cdca0SMaxim Mikityanskiy static void mlx5e_xdp_mpwqe_session_start(struct mlx5e_xdpsq *sq) 196ec9cdca0SMaxim Mikityanskiy { 197ec9cdca0SMaxim Mikityanskiy struct mlx5e_xdp_mpwqe *session = &sq->mpwqe; 198ec9cdca0SMaxim Mikityanskiy struct mlx5e_xdpsq_stats *stats = sq->stats; 19997e3afd6SMaxim Mikityanskiy struct mlx5e_tx_wqe *wqe; 200ec9cdca0SMaxim Mikityanskiy u16 pi; 201ec9cdca0SMaxim Mikityanskiy 202388a2b56SMaxim Mikityanskiy pi = mlx5e_xdpsq_get_next_pi(sq, MLX5E_XDP_MPW_MAX_WQEBBS); 20397e3afd6SMaxim Mikityanskiy wqe = MLX5E_TX_FETCH_WQE(sq, pi); 20497e3afd6SMaxim Mikityanskiy net_prefetchw(wqe->data); 2055e0d2eefSTariq Toukan 20697e3afd6SMaxim Mikityanskiy *session = (struct mlx5e_xdp_mpwqe) { 20797e3afd6SMaxim Mikityanskiy .wqe = wqe, 20897e3afd6SMaxim Mikityanskiy .ds_count = MLX5E_TX_WQE_EMPTY_DS_COUNT, 20997e3afd6SMaxim Mikityanskiy .pkt_count = 0, 21097e3afd6SMaxim Mikityanskiy .inline_on = mlx5e_xdp_get_inline_state(sq, session->inline_on), 21197e3afd6SMaxim Mikityanskiy }; 212c2273219SShay Agroskin 21373cab880SShay Agroskin stats->mpwqe++; 2145e0d2eefSTariq Toukan } 2155e0d2eefSTariq Toukan 216db05815bSMaxim Mikityanskiy void mlx5e_xdp_mpwqe_complete(struct mlx5e_xdpsq *sq) 2175e0d2eefSTariq Toukan { 2185e0d2eefSTariq Toukan struct mlx5_wq_cyc *wq = &sq->wq; 2195e0d2eefSTariq Toukan struct mlx5e_xdp_mpwqe *session = &sq->mpwqe; 2205e0d2eefSTariq Toukan struct mlx5_wqe_ctrl_seg *cseg = &session->wqe->ctrl; 2215e0d2eefSTariq Toukan u16 ds_count = session->ds_count; 2225e0d2eefSTariq Toukan u16 pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc); 2235e0d2eefSTariq Toukan struct mlx5e_xdp_wqe_info *wi = &sq->db.wqe_info[pi]; 2245e0d2eefSTariq Toukan 2255e0d2eefSTariq Toukan cseg->opmod_idx_opcode = 2265e0d2eefSTariq Toukan cpu_to_be32((sq->pc << 8) | MLX5_OPCODE_ENHANCED_MPSW); 2275e0d2eefSTariq Toukan cseg->qpn_ds = cpu_to_be32((sq->sqn << 8) | ds_count); 2285e0d2eefSTariq Toukan 2295e0d2eefSTariq Toukan wi->num_wqebbs = DIV_ROUND_UP(ds_count, MLX5_SEND_WQEBB_NUM_DS); 230c2273219SShay Agroskin wi->num_pkts = session->pkt_count; 2315e0d2eefSTariq Toukan 2325e0d2eefSTariq Toukan sq->pc += wi->num_wqebbs; 2335e0d2eefSTariq Toukan 2345e0d2eefSTariq Toukan sq->doorbell_cseg = cseg; 2355e0d2eefSTariq Toukan 2365e0d2eefSTariq Toukan session->wqe = NULL; /* Close session */ 2375e0d2eefSTariq Toukan } 2385e0d2eefSTariq Toukan 239db05815bSMaxim Mikityanskiy enum { 240db05815bSMaxim Mikityanskiy MLX5E_XDP_CHECK_OK = 1, 241db05815bSMaxim Mikityanskiy MLX5E_XDP_CHECK_START_MPWQE = 2, 242db05815bSMaxim Mikityanskiy }; 243db05815bSMaxim Mikityanskiy 24493761ca1STariq Toukan INDIRECT_CALLABLE_SCOPE int mlx5e_xmit_xdp_frame_check_mpwqe(struct mlx5e_xdpsq *sq) 245db05815bSMaxim Mikityanskiy { 246db05815bSMaxim Mikityanskiy if (unlikely(!sq->mpwqe.wqe)) { 2475ffb4d85SMaxim Mikityanskiy const u16 stop_room = mlx5e_stop_room_for_wqe(MLX5_SEND_WQE_MAX_WQEBBS); 2485ffb4d85SMaxim Mikityanskiy 249db05815bSMaxim Mikityanskiy if (unlikely(!mlx5e_wqc_has_room_for(&sq->wq, sq->cc, sq->pc, 2505ffb4d85SMaxim Mikityanskiy stop_room))) { 251db05815bSMaxim Mikityanskiy /* SQ is full, ring doorbell */ 252db05815bSMaxim Mikityanskiy mlx5e_xmit_xdp_doorbell(sq); 253db05815bSMaxim Mikityanskiy sq->stats->full++; 254db05815bSMaxim Mikityanskiy return -EBUSY; 255db05815bSMaxim Mikityanskiy } 256db05815bSMaxim Mikityanskiy 257db05815bSMaxim Mikityanskiy return MLX5E_XDP_CHECK_START_MPWQE; 258db05815bSMaxim Mikityanskiy } 259db05815bSMaxim Mikityanskiy 260db05815bSMaxim Mikityanskiy return MLX5E_XDP_CHECK_OK; 261db05815bSMaxim Mikityanskiy } 262db05815bSMaxim Mikityanskiy 26393761ca1STariq Toukan INDIRECT_CALLABLE_SCOPE bool 26493761ca1STariq Toukan mlx5e_xmit_xdp_frame_mpwqe(struct mlx5e_xdpsq *sq, struct mlx5e_xdp_xmit_data *xdptxd, 26593761ca1STariq Toukan struct mlx5e_xdp_info *xdpi, int check_result) 2665e0d2eefSTariq Toukan { 2675e0d2eefSTariq Toukan struct mlx5e_xdp_mpwqe *session = &sq->mpwqe; 2685e0d2eefSTariq Toukan struct mlx5e_xdpsq_stats *stats = sq->stats; 2695e0d2eefSTariq Toukan 270d963fa15SMaxim Mikityanskiy if (unlikely(xdptxd->len > sq->hw_mtu)) { 2715e0d2eefSTariq Toukan stats->err++; 2725e0d2eefSTariq Toukan return false; 2735e0d2eefSTariq Toukan } 2745e0d2eefSTariq Toukan 275db05815bSMaxim Mikityanskiy if (!check_result) 276db05815bSMaxim Mikityanskiy check_result = mlx5e_xmit_xdp_frame_check_mpwqe(sq); 277db05815bSMaxim Mikityanskiy if (unlikely(check_result < 0)) 2785e0d2eefSTariq Toukan return false; 2795e0d2eefSTariq Toukan 280db05815bSMaxim Mikityanskiy if (check_result == MLX5E_XDP_CHECK_START_MPWQE) { 281db05815bSMaxim Mikityanskiy /* Start the session when nothing can fail, so it's guaranteed 282db05815bSMaxim Mikityanskiy * that if there is an active session, it has at least one dseg, 283db05815bSMaxim Mikityanskiy * and it's safe to complete it at any time. 284db05815bSMaxim Mikityanskiy */ 2855e0d2eefSTariq Toukan mlx5e_xdp_mpwqe_session_start(sq); 2865e0d2eefSTariq Toukan } 2875e0d2eefSTariq Toukan 288d963fa15SMaxim Mikityanskiy mlx5e_xdp_mpwqe_add_dseg(sq, xdptxd, stats); 2895e0d2eefSTariq Toukan 290388a2b56SMaxim Mikityanskiy if (unlikely(mlx5e_xdp_mpqwe_is_full(session))) 2915e0d2eefSTariq Toukan mlx5e_xdp_mpwqe_complete(sq); 2925e0d2eefSTariq Toukan 2935e0d2eefSTariq Toukan mlx5e_xdpi_fifo_push(&sq->db.xdpi_fifo, xdpi); 2945e0d2eefSTariq Toukan stats->xmit++; 2955e0d2eefSTariq Toukan return true; 2965e0d2eefSTariq Toukan } 2975e0d2eefSTariq Toukan 29893761ca1STariq Toukan INDIRECT_CALLABLE_SCOPE int mlx5e_xmit_xdp_frame_check(struct mlx5e_xdpsq *sq) 299db05815bSMaxim Mikityanskiy { 300db05815bSMaxim Mikityanskiy if (unlikely(!mlx5e_wqc_has_room_for(&sq->wq, sq->cc, sq->pc, 1))) { 301db05815bSMaxim Mikityanskiy /* SQ is full, ring doorbell */ 302db05815bSMaxim Mikityanskiy mlx5e_xmit_xdp_doorbell(sq); 303db05815bSMaxim Mikityanskiy sq->stats->full++; 304db05815bSMaxim Mikityanskiy return -EBUSY; 305db05815bSMaxim Mikityanskiy } 306db05815bSMaxim Mikityanskiy 307db05815bSMaxim Mikityanskiy return MLX5E_XDP_CHECK_OK; 308db05815bSMaxim Mikityanskiy } 309db05815bSMaxim Mikityanskiy 31093761ca1STariq Toukan INDIRECT_CALLABLE_SCOPE bool 31193761ca1STariq Toukan mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq, struct mlx5e_xdp_xmit_data *xdptxd, 31293761ca1STariq Toukan struct mlx5e_xdp_info *xdpi, int check_result) 313159d2131STariq Toukan { 314159d2131STariq Toukan struct mlx5_wq_cyc *wq = &sq->wq; 315159d2131STariq Toukan u16 pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc); 316159d2131STariq Toukan struct mlx5e_tx_wqe *wqe = mlx5_wq_cyc_get_wqe(wq, pi); 317159d2131STariq Toukan 318159d2131STariq Toukan struct mlx5_wqe_ctrl_seg *cseg = &wqe->ctrl; 319159d2131STariq Toukan struct mlx5_wqe_eth_seg *eseg = &wqe->eth; 320c94e4f11STariq Toukan struct mlx5_wqe_data_seg *dseg = wqe->data; 321159d2131STariq Toukan 322d963fa15SMaxim Mikityanskiy dma_addr_t dma_addr = xdptxd->dma_addr; 323d963fa15SMaxim Mikityanskiy u32 dma_len = xdptxd->len; 324159d2131STariq Toukan 325890388adSTariq Toukan struct mlx5e_xdpsq_stats *stats = sq->stats; 326159d2131STariq Toukan 327e20f0dbfSTariq Toukan net_prefetchw(wqe); 328159d2131STariq Toukan 329c94e4f11STariq Toukan if (unlikely(dma_len < MLX5E_XDP_MIN_INLINE || sq->hw_mtu < dma_len)) { 330890388adSTariq Toukan stats->err++; 331159d2131STariq Toukan return false; 332159d2131STariq Toukan } 333159d2131STariq Toukan 334db05815bSMaxim Mikityanskiy if (!check_result) 335db05815bSMaxim Mikityanskiy check_result = mlx5e_xmit_xdp_frame_check(sq); 336db05815bSMaxim Mikityanskiy if (unlikely(check_result < 0)) 337159d2131STariq Toukan return false; 338159d2131STariq Toukan 339159d2131STariq Toukan cseg->fm_ce_se = 0; 340159d2131STariq Toukan 341159d2131STariq Toukan /* copy the inline part if required */ 342159d2131STariq Toukan if (sq->min_inline_mode != MLX5_INLINE_MODE_NONE) { 343d963fa15SMaxim Mikityanskiy memcpy(eseg->inline_hdr.start, xdptxd->data, MLX5E_XDP_MIN_INLINE); 344159d2131STariq Toukan eseg->inline_hdr.sz = cpu_to_be16(MLX5E_XDP_MIN_INLINE); 345159d2131STariq Toukan dma_len -= MLX5E_XDP_MIN_INLINE; 346159d2131STariq Toukan dma_addr += MLX5E_XDP_MIN_INLINE; 347159d2131STariq Toukan dseg++; 348159d2131STariq Toukan } 349159d2131STariq Toukan 350159d2131STariq Toukan /* write the dma part */ 351159d2131STariq Toukan dseg->addr = cpu_to_be64(dma_addr); 352159d2131STariq Toukan dseg->byte_count = cpu_to_be32(dma_len); 353159d2131STariq Toukan 354159d2131STariq Toukan cseg->opmod_idx_opcode = cpu_to_be32((sq->pc << 8) | MLX5_OPCODE_SEND); 355159d2131STariq Toukan 356159d2131STariq Toukan sq->pc++; 357159d2131STariq Toukan 358b8180392STariq Toukan sq->doorbell_cseg = cseg; 359159d2131STariq Toukan 360fea28dd6STariq Toukan mlx5e_xdpi_fifo_push(&sq->db.xdpi_fifo, xdpi); 361890388adSTariq Toukan stats->xmit++; 362159d2131STariq Toukan return true; 363159d2131STariq Toukan } 364159d2131STariq Toukan 36533e10924SMaxim Mikityanskiy static void mlx5e_free_xdpsq_desc(struct mlx5e_xdpsq *sq, 36633e10924SMaxim Mikityanskiy struct mlx5e_xdp_wqe_info *wi, 367db05815bSMaxim Mikityanskiy u32 *xsk_frames, 36833e10924SMaxim Mikityanskiy bool recycle) 36933e10924SMaxim Mikityanskiy { 37033e10924SMaxim Mikityanskiy struct mlx5e_xdp_info_fifo *xdpi_fifo = &sq->db.xdpi_fifo; 37133e10924SMaxim Mikityanskiy u16 i; 37233e10924SMaxim Mikityanskiy 37333e10924SMaxim Mikityanskiy for (i = 0; i < wi->num_pkts; i++) { 37433e10924SMaxim Mikityanskiy struct mlx5e_xdp_info xdpi = mlx5e_xdpi_fifo_pop(xdpi_fifo); 37533e10924SMaxim Mikityanskiy 376d963fa15SMaxim Mikityanskiy switch (xdpi.mode) { 377d963fa15SMaxim Mikityanskiy case MLX5E_XDP_XMIT_MODE_FRAME: 37884a0a231SMaxim Mikityanskiy /* XDP_TX from the XSK RQ and XDP_REDIRECT */ 379d963fa15SMaxim Mikityanskiy dma_unmap_single(sq->pdev, xdpi.frame.dma_addr, 380d963fa15SMaxim Mikityanskiy xdpi.frame.xdpf->len, DMA_TO_DEVICE); 381d963fa15SMaxim Mikityanskiy xdp_return_frame(xdpi.frame.xdpf); 382d963fa15SMaxim Mikityanskiy break; 383d963fa15SMaxim Mikityanskiy case MLX5E_XDP_XMIT_MODE_PAGE: 38484a0a231SMaxim Mikityanskiy /* XDP_TX from the regular RQ */ 385db05815bSMaxim Mikityanskiy mlx5e_page_release_dynamic(xdpi.page.rq, &xdpi.page.di, recycle); 386db05815bSMaxim Mikityanskiy break; 387db05815bSMaxim Mikityanskiy case MLX5E_XDP_XMIT_MODE_XSK: 388db05815bSMaxim Mikityanskiy /* AF_XDP send */ 389db05815bSMaxim Mikityanskiy (*xsk_frames)++; 390d963fa15SMaxim Mikityanskiy break; 391d963fa15SMaxim Mikityanskiy default: 392d963fa15SMaxim Mikityanskiy WARN_ON_ONCE(true); 39333e10924SMaxim Mikityanskiy } 39433e10924SMaxim Mikityanskiy } 39533e10924SMaxim Mikityanskiy } 39633e10924SMaxim Mikityanskiy 397b9673cf5SMaxim Mikityanskiy bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq) 398159d2131STariq Toukan { 399159d2131STariq Toukan struct mlx5e_xdpsq *sq; 400159d2131STariq Toukan struct mlx5_cqe64 *cqe; 401db05815bSMaxim Mikityanskiy u32 xsk_frames = 0; 402159d2131STariq Toukan u16 sqcc; 403159d2131STariq Toukan int i; 404159d2131STariq Toukan 405159d2131STariq Toukan sq = container_of(cq, struct mlx5e_xdpsq, cq); 406159d2131STariq Toukan 407159d2131STariq Toukan if (unlikely(!test_bit(MLX5E_SQ_STATE_ENABLED, &sq->state))) 408159d2131STariq Toukan return false; 409159d2131STariq Toukan 410159d2131STariq Toukan cqe = mlx5_cqwq_get_cqe(&cq->wq); 411159d2131STariq Toukan if (!cqe) 412159d2131STariq Toukan return false; 413159d2131STariq Toukan 414159d2131STariq Toukan /* sq->cc must be updated only after mlx5_cqwq_update_db_record(), 415159d2131STariq Toukan * otherwise a cq overrun may occur 416159d2131STariq Toukan */ 417159d2131STariq Toukan sqcc = sq->cc; 418159d2131STariq Toukan 419159d2131STariq Toukan i = 0; 420159d2131STariq Toukan do { 421e2e11dbfSTariq Toukan struct mlx5e_xdp_wqe_info *wi; 422e2e11dbfSTariq Toukan u16 wqe_counter, ci; 423159d2131STariq Toukan bool last_wqe; 424159d2131STariq Toukan 425159d2131STariq Toukan mlx5_cqwq_pop(&cq->wq); 426159d2131STariq Toukan 427159d2131STariq Toukan wqe_counter = be16_to_cpu(cqe->wqe_counter); 428159d2131STariq Toukan 429159d2131STariq Toukan do { 430159d2131STariq Toukan last_wqe = (sqcc == wqe_counter); 4311feeab80STariq Toukan ci = mlx5_wq_cyc_ctr2ix(&sq->wq, sqcc); 4321feeab80STariq Toukan wi = &sq->db.wqe_info[ci]; 4331feeab80STariq Toukan 4341feeab80STariq Toukan sqcc += wi->num_wqebbs; 4351feeab80STariq Toukan 436db05815bSMaxim Mikityanskiy mlx5e_free_xdpsq_desc(sq, wi, &xsk_frames, true); 437159d2131STariq Toukan } while (!last_wqe); 438f1b95753STariq Toukan 439f1b95753STariq Toukan if (unlikely(get_cqe_opcode(cqe) != MLX5_CQE_REQ)) { 440f1b95753STariq Toukan netdev_WARN_ONCE(sq->channel->netdev, 441f1b95753STariq Toukan "Bad OP in XDPSQ CQE: 0x%x\n", 442f1b95753STariq Toukan get_cqe_opcode(cqe)); 443f1b95753STariq Toukan mlx5e_dump_error_cqe(&sq->cq, sq->sqn, 444f1b95753STariq Toukan (struct mlx5_err_cqe *)cqe); 445e2e11dbfSTariq Toukan mlx5_wq_cyc_wqe_dump(&sq->wq, ci, wi->num_wqebbs); 446f1b95753STariq Toukan } 447159d2131STariq Toukan } while ((++i < MLX5E_TX_CQ_POLL_BUDGET) && (cqe = mlx5_cqwq_get_cqe(&cq->wq))); 448159d2131STariq Toukan 449db05815bSMaxim Mikityanskiy if (xsk_frames) 450c4655761SMagnus Karlsson xsk_tx_completed(sq->xsk_pool, xsk_frames); 451db05815bSMaxim Mikityanskiy 452890388adSTariq Toukan sq->stats->cqes += i; 453159d2131STariq Toukan 454159d2131STariq Toukan mlx5_cqwq_update_db_record(&cq->wq); 455159d2131STariq Toukan 456159d2131STariq Toukan /* ensure cq space is freed before enabling more cqes */ 457159d2131STariq Toukan wmb(); 458159d2131STariq Toukan 459159d2131STariq Toukan sq->cc = sqcc; 460159d2131STariq Toukan return (i == MLX5E_TX_CQ_POLL_BUDGET); 461159d2131STariq Toukan } 462159d2131STariq Toukan 463b9673cf5SMaxim Mikityanskiy void mlx5e_free_xdpsq_descs(struct mlx5e_xdpsq *sq) 464159d2131STariq Toukan { 465db05815bSMaxim Mikityanskiy u32 xsk_frames = 0; 466db05815bSMaxim Mikityanskiy 467159d2131STariq Toukan while (sq->cc != sq->pc) { 4681feeab80STariq Toukan struct mlx5e_xdp_wqe_info *wi; 46933e10924SMaxim Mikityanskiy u16 ci; 4701feeab80STariq Toukan 4711feeab80STariq Toukan ci = mlx5_wq_cyc_ctr2ix(&sq->wq, sq->cc); 4721feeab80STariq Toukan wi = &sq->db.wqe_info[ci]; 4731feeab80STariq Toukan 4741feeab80STariq Toukan sq->cc += wi->num_wqebbs; 4751feeab80STariq Toukan 476db05815bSMaxim Mikityanskiy mlx5e_free_xdpsq_desc(sq, wi, &xsk_frames, false); 47758b99ee3STariq Toukan } 478db05815bSMaxim Mikityanskiy 479db05815bSMaxim Mikityanskiy if (xsk_frames) 480c4655761SMagnus Karlsson xsk_tx_completed(sq->xsk_pool, xsk_frames); 4811feeab80STariq Toukan } 482159d2131STariq Toukan 48358b99ee3STariq Toukan int mlx5e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames, 48458b99ee3STariq Toukan u32 flags) 48558b99ee3STariq Toukan { 48658b99ee3STariq Toukan struct mlx5e_priv *priv = netdev_priv(dev); 48758b99ee3STariq Toukan struct mlx5e_xdpsq *sq; 48858b99ee3STariq Toukan int drops = 0; 48958b99ee3STariq Toukan int sq_num; 49058b99ee3STariq Toukan int i; 49158b99ee3STariq Toukan 492407e17b1SSaeed Mahameed /* this flag is sufficient, no need to test internal sq state */ 493407e17b1SSaeed Mahameed if (unlikely(!mlx5e_xdp_tx_is_enabled(priv))) 49458b99ee3STariq Toukan return -ENETDOWN; 49558b99ee3STariq Toukan 49658b99ee3STariq Toukan if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) 49758b99ee3STariq Toukan return -EINVAL; 49858b99ee3STariq Toukan 49958b99ee3STariq Toukan sq_num = smp_processor_id(); 50058b99ee3STariq Toukan 50158b99ee3STariq Toukan if (unlikely(sq_num >= priv->channels.num)) 50258b99ee3STariq Toukan return -ENXIO; 50358b99ee3STariq Toukan 50458b99ee3STariq Toukan sq = &priv->channels.c[sq_num]->xdpsq; 50558b99ee3STariq Toukan 50658b99ee3STariq Toukan for (i = 0; i < n; i++) { 50758b99ee3STariq Toukan struct xdp_frame *xdpf = frames[i]; 508d963fa15SMaxim Mikityanskiy struct mlx5e_xdp_xmit_data xdptxd; 50958b99ee3STariq Toukan struct mlx5e_xdp_info xdpi; 51093761ca1STariq Toukan bool ret; 51158b99ee3STariq Toukan 512d963fa15SMaxim Mikityanskiy xdptxd.data = xdpf->data; 513d963fa15SMaxim Mikityanskiy xdptxd.len = xdpf->len; 514d963fa15SMaxim Mikityanskiy xdptxd.dma_addr = dma_map_single(sq->pdev, xdptxd.data, 515d963fa15SMaxim Mikityanskiy xdptxd.len, DMA_TO_DEVICE); 516d963fa15SMaxim Mikityanskiy 517d963fa15SMaxim Mikityanskiy if (unlikely(dma_mapping_error(sq->pdev, xdptxd.dma_addr))) { 51839c64d8cSJesper Dangaard Brouer xdp_return_frame_rx_napi(xdpf); 51958b99ee3STariq Toukan drops++; 52058b99ee3STariq Toukan continue; 52158b99ee3STariq Toukan } 52258b99ee3STariq Toukan 523d963fa15SMaxim Mikityanskiy xdpi.mode = MLX5E_XDP_XMIT_MODE_FRAME; 524d963fa15SMaxim Mikityanskiy xdpi.frame.xdpf = xdpf; 525d963fa15SMaxim Mikityanskiy xdpi.frame.dma_addr = xdptxd.dma_addr; 52658b99ee3STariq Toukan 52793761ca1STariq Toukan ret = INDIRECT_CALL_2(sq->xmit_xdp_frame, mlx5e_xmit_xdp_frame_mpwqe, 52893761ca1STariq Toukan mlx5e_xmit_xdp_frame, sq, &xdptxd, &xdpi, 0); 52993761ca1STariq Toukan if (unlikely(!ret)) { 530d963fa15SMaxim Mikityanskiy dma_unmap_single(sq->pdev, xdptxd.dma_addr, 531d963fa15SMaxim Mikityanskiy xdptxd.len, DMA_TO_DEVICE); 53258b99ee3STariq Toukan xdp_return_frame_rx_napi(xdpf); 53358b99ee3STariq Toukan drops++; 53458b99ee3STariq Toukan } 53558b99ee3STariq Toukan } 53658b99ee3STariq Toukan 5375e0d2eefSTariq Toukan if (flags & XDP_XMIT_FLUSH) { 5385e0d2eefSTariq Toukan if (sq->mpwqe.wqe) 5395e0d2eefSTariq Toukan mlx5e_xdp_mpwqe_complete(sq); 54058b99ee3STariq Toukan mlx5e_xmit_xdp_doorbell(sq); 5415e0d2eefSTariq Toukan } 54258b99ee3STariq Toukan 54358b99ee3STariq Toukan return n - drops; 54458b99ee3STariq Toukan } 5454fb2f516STariq Toukan 5464fb2f516STariq Toukan void mlx5e_xdp_rx_poll_complete(struct mlx5e_rq *rq) 5474fb2f516STariq Toukan { 548b9673cf5SMaxim Mikityanskiy struct mlx5e_xdpsq *xdpsq = rq->xdpsq; 5494fb2f516STariq Toukan 5505e0d2eefSTariq Toukan if (xdpsq->mpwqe.wqe) 5515e0d2eefSTariq Toukan mlx5e_xdp_mpwqe_complete(xdpsq); 5525e0d2eefSTariq Toukan 5534fb2f516STariq Toukan mlx5e_xmit_xdp_doorbell(xdpsq); 5544fb2f516STariq Toukan 55515143bf5STariq Toukan if (test_bit(MLX5E_RQ_FLAG_XDP_REDIRECT, rq->flags)) { 5564fb2f516STariq Toukan xdp_do_flush_map(); 55715143bf5STariq Toukan __clear_bit(MLX5E_RQ_FLAG_XDP_REDIRECT, rq->flags); 5584fb2f516STariq Toukan } 5594fb2f516STariq Toukan } 5605e0d2eefSTariq Toukan 5615e0d2eefSTariq Toukan void mlx5e_set_xmit_fp(struct mlx5e_xdpsq *sq, bool is_mpw) 5625e0d2eefSTariq Toukan { 563db05815bSMaxim Mikityanskiy sq->xmit_xdp_frame_check = is_mpw ? 564db05815bSMaxim Mikityanskiy mlx5e_xmit_xdp_frame_check_mpwqe : mlx5e_xmit_xdp_frame_check; 5655e0d2eefSTariq Toukan sq->xmit_xdp_frame = is_mpw ? 5665e0d2eefSTariq Toukan mlx5e_xmit_xdp_frame_mpwqe : mlx5e_xmit_xdp_frame; 5675e0d2eefSTariq Toukan } 568