/*
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* Copyright (c) 2018, Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/bpf_trace.h>
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#include <net/xdp_sock_drv.h>
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#include "en/xdp.h"
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#include "en/params.h"
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int mlx5e_xdp_max_mtu(struct mlx5e_params *params, struct mlx5e_xsk_param *xsk)
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{
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int hr = mlx5e_get_linear_rq_headroom(params, xsk);
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/* Let S := SKB_DATA_ALIGN(sizeof(struct skb_shared_info)).
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* The condition checked in mlx5e_rx_is_linear_skb is:
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* SKB_DATA_ALIGN(sw_mtu + hard_mtu + hr) + S <= PAGE_SIZE (1)
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* (Note that hw_mtu == sw_mtu + hard_mtu.)
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* What is returned from this function is:
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* max_mtu = PAGE_SIZE - S - hr - hard_mtu (2)
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* After assigning sw_mtu := max_mtu, the left side of (1) turns to
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* SKB_DATA_ALIGN(PAGE_SIZE - S) + S, which is equal to PAGE_SIZE,
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* because both PAGE_SIZE and S are already aligned. Any number greater
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* than max_mtu would make the left side of (1) greater than PAGE_SIZE,
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* so max_mtu is the maximum MTU allowed.
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*/
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return MLX5E_HW2SW_MTU(params, SKB_MAX_HEAD(hr));
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}
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static inline bool
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mlx5e_xmit_xdp_buff(struct mlx5e_xdpsq *sq, struct mlx5e_rq *rq,
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struct mlx5e_dma_info *di, struct xdp_buff *xdp)
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{
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struct mlx5e_xmit_data xdptxd;
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struct mlx5e_xdp_info xdpi;
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struct xdp_frame *xdpf;
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dma_addr_t dma_addr;
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xdpf = xdp_convert_buff_to_frame(xdp);
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if (unlikely(!xdpf))
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return false;
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xdptxd.data = xdpf->data;
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xdptxd.len = xdpf->len;
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if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL) {
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/* The xdp_buff was in the UMEM and was copied into a newly
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* allocated page. The UMEM page was returned via the ZCA, and
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* this new page has to be mapped at this point and has to be
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* unmapped and returned via xdp_return_frame on completion.
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*/
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/* Prevent double recycling of the UMEM page. Even in case this
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* function returns false, the xdp_buff shouldn't be recycled,
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* as it was already done in xdp_convert_zc_to_xdp_frame.
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*/
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__set_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags); /* non-atomic */
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xdpi.mode = MLX5E_XDP_XMIT_MODE_FRAME;
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dma_addr = dma_map_single(sq->pdev, xdptxd.data, xdptxd.len,
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DMA_TO_DEVICE);
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if (dma_mapping_error(sq->pdev, dma_addr)) {
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xdp_return_frame(xdpf);
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return false;
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}
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xdptxd.dma_addr = dma_addr;
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xdpi.frame.xdpf = xdpf;
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xdpi.frame.dma_addr = dma_addr;
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} else {
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/* Driver assumes that xdp_convert_buff_to_frame returns
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* an xdp_frame that points to the same memory region as
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* the original xdp_buff. It allows to map the memory only
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* once and to use the DMA_BIDIRECTIONAL mode.
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*/
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xdpi.mode = MLX5E_XDP_XMIT_MODE_PAGE;
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dma_addr = di->addr + (xdpf->data - (void *)xdpf);
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dma_sync_single_for_device(sq->pdev, dma_addr, xdptxd.len,
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DMA_TO_DEVICE);
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xdptxd.dma_addr = dma_addr;
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xdpi.page.rq = rq;
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xdpi.page.di = *di;
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}
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return INDIRECT_CALL_2(sq->xmit_xdp_frame, mlx5e_xmit_xdp_frame_mpwqe,
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mlx5e_xmit_xdp_frame, sq, &xdptxd, &xdpi, 0);
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}
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/* returns true if packet was consumed by xdp */
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bool mlx5e_xdp_handle(struct mlx5e_rq *rq, struct mlx5e_dma_info *di,
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u32 *len, struct xdp_buff *xdp)
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{
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struct bpf_prog *prog = rcu_dereference(rq->xdp_prog);
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u32 act;
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int err;
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if (!prog)
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return false;
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act = bpf_prog_run_xdp(prog, xdp);
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switch (act) {
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case XDP_PASS:
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*len = xdp->data_end - xdp->data;
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return false;
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case XDP_TX:
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if (unlikely(!mlx5e_xmit_xdp_buff(rq->xdpsq, rq, di, xdp)))
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goto xdp_abort;
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__set_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags); /* non-atomic */
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return true;
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case XDP_REDIRECT:
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/* When XDP enabled then page-refcnt==1 here */
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err = xdp_do_redirect(rq->netdev, xdp, prog);
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if (unlikely(err))
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goto xdp_abort;
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__set_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags);
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__set_bit(MLX5E_RQ_FLAG_XDP_REDIRECT, rq->flags);
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if (xdp->rxq->mem.type != MEM_TYPE_XSK_BUFF_POOL)
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mlx5e_page_dma_unmap(rq, di);
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rq->stats->xdp_redirect++;
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return true;
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default:
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bpf_warn_invalid_xdp_action(act);
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fallthrough;
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case XDP_ABORTED:
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xdp_abort:
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trace_xdp_exception(rq->netdev, prog, act);
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fallthrough;
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case XDP_DROP:
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rq->stats->xdp_drop++;
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return true;
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}
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}
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static u16 mlx5e_xdpsq_get_next_pi(struct mlx5e_xdpsq *sq, u16 size)
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{
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struct mlx5_wq_cyc *wq = &sq->wq;
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u16 pi, contig_wqebbs;
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pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
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contig_wqebbs = mlx5_wq_cyc_get_contig_wqebbs(wq, pi);
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if (unlikely(contig_wqebbs < size)) {
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struct mlx5e_xdp_wqe_info *wi, *edge_wi;
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wi = &sq->db.wqe_info[pi];
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edge_wi = wi + contig_wqebbs;
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/* Fill SQ frag edge with NOPs to avoid WQE wrapping two pages. */
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for (; wi < edge_wi; wi++) {
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*wi = (struct mlx5e_xdp_wqe_info) {
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.num_wqebbs = 1,
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.num_pkts = 0,
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};
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mlx5e_post_nop(wq, sq->sqn, &sq->pc);
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}
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sq->stats->nops += contig_wqebbs;
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pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
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}
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return pi;
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}
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static void mlx5e_xdp_mpwqe_session_start(struct mlx5e_xdpsq *sq)
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{
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struct mlx5e_tx_mpwqe *session = &sq->mpwqe;
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struct mlx5e_xdpsq_stats *stats = sq->stats;
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struct mlx5e_tx_wqe *wqe;
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u16 pi;
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pi = mlx5e_xdpsq_get_next_pi(sq, MLX5E_TX_MPW_MAX_WQEBBS);
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wqe = MLX5E_TX_FETCH_WQE(sq, pi);
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net_prefetchw(wqe->data);
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*session = (struct mlx5e_tx_mpwqe) {
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.wqe = wqe,
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.bytes_count = 0,
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.ds_count = MLX5E_TX_WQE_EMPTY_DS_COUNT,
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.pkt_count = 0,
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.inline_on = mlx5e_xdp_get_inline_state(sq, session->inline_on),
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};
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stats->mpwqe++;
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}
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void mlx5e_xdp_mpwqe_complete(struct mlx5e_xdpsq *sq)
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{
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struct mlx5_wq_cyc *wq = &sq->wq;
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struct mlx5e_tx_mpwqe *session = &sq->mpwqe;
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struct mlx5_wqe_ctrl_seg *cseg = &session->wqe->ctrl;
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u16 ds_count = session->ds_count;
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u16 pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
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struct mlx5e_xdp_wqe_info *wi = &sq->db.wqe_info[pi];
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cseg->opmod_idx_opcode =
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cpu_to_be32((sq->pc << 8) | MLX5_OPCODE_ENHANCED_MPSW);
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cseg->qpn_ds = cpu_to_be32((sq->sqn << 8) | ds_count);
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wi->num_wqebbs = DIV_ROUND_UP(ds_count, MLX5_SEND_WQEBB_NUM_DS);
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wi->num_pkts = session->pkt_count;
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sq->pc += wi->num_wqebbs;
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sq->doorbell_cseg = cseg;
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session->wqe = NULL; /* Close session */
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}
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enum {
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MLX5E_XDP_CHECK_OK = 1,
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MLX5E_XDP_CHECK_START_MPWQE = 2,
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};
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INDIRECT_CALLABLE_SCOPE int mlx5e_xmit_xdp_frame_check_mpwqe(struct mlx5e_xdpsq *sq)
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{
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if (unlikely(!sq->mpwqe.wqe)) {
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const u16 stop_room = mlx5e_stop_room_for_wqe(MLX5_SEND_WQE_MAX_WQEBBS);
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if (unlikely(!mlx5e_wqc_has_room_for(&sq->wq, sq->cc, sq->pc,
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stop_room))) {
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/* SQ is full, ring doorbell */
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mlx5e_xmit_xdp_doorbell(sq);
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sq->stats->full++;
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return -EBUSY;
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}
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return MLX5E_XDP_CHECK_START_MPWQE;
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}
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return MLX5E_XDP_CHECK_OK;
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}
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INDIRECT_CALLABLE_SCOPE bool
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mlx5e_xmit_xdp_frame_mpwqe(struct mlx5e_xdpsq *sq, struct mlx5e_xmit_data *xdptxd,
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struct mlx5e_xdp_info *xdpi, int check_result)
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{
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struct mlx5e_tx_mpwqe *session = &sq->mpwqe;
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struct mlx5e_xdpsq_stats *stats = sq->stats;
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if (unlikely(xdptxd->len > sq->hw_mtu)) {
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stats->err++;
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return false;
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}
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if (!check_result)
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check_result = mlx5e_xmit_xdp_frame_check_mpwqe(sq);
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if (unlikely(check_result < 0))
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return false;
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if (check_result == MLX5E_XDP_CHECK_START_MPWQE) {
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/* Start the session when nothing can fail, so it's guaranteed
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* that if there is an active session, it has at least one dseg,
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* and it's safe to complete it at any time.
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*/
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mlx5e_xdp_mpwqe_session_start(sq);
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}
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mlx5e_xdp_mpwqe_add_dseg(sq, xdptxd, stats);
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if (unlikely(mlx5e_xdp_mpqwe_is_full(session)))
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mlx5e_xdp_mpwqe_complete(sq);
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mlx5e_xdpi_fifo_push(&sq->db.xdpi_fifo, xdpi);
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stats->xmit++;
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return true;
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}
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INDIRECT_CALLABLE_SCOPE int mlx5e_xmit_xdp_frame_check(struct mlx5e_xdpsq *sq)
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{
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if (unlikely(!mlx5e_wqc_has_room_for(&sq->wq, sq->cc, sq->pc, 1))) {
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/* SQ is full, ring doorbell */
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mlx5e_xmit_xdp_doorbell(sq);
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sq->stats->full++;
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return -EBUSY;
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}
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return MLX5E_XDP_CHECK_OK;
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}
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INDIRECT_CALLABLE_SCOPE bool
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mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq, struct mlx5e_xmit_data *xdptxd,
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struct mlx5e_xdp_info *xdpi, int check_result)
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{
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struct mlx5_wq_cyc *wq = &sq->wq;
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u16 pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
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struct mlx5e_tx_wqe *wqe = mlx5_wq_cyc_get_wqe(wq, pi);
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struct mlx5_wqe_ctrl_seg *cseg = &wqe->ctrl;
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struct mlx5_wqe_eth_seg *eseg = &wqe->eth;
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struct mlx5_wqe_data_seg *dseg = wqe->data;
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dma_addr_t dma_addr = xdptxd->dma_addr;
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u32 dma_len = xdptxd->len;
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struct mlx5e_xdpsq_stats *stats = sq->stats;
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net_prefetchw(wqe);
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if (unlikely(dma_len < MLX5E_XDP_MIN_INLINE || sq->hw_mtu < dma_len)) {
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stats->err++;
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return false;
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}
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if (!check_result)
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check_result = mlx5e_xmit_xdp_frame_check(sq);
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if (unlikely(check_result < 0))
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return false;
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cseg->fm_ce_se = 0;
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/* copy the inline part if required */
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if (sq->min_inline_mode != MLX5_INLINE_MODE_NONE) {
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memcpy(eseg->inline_hdr.start, xdptxd->data, MLX5E_XDP_MIN_INLINE);
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eseg->inline_hdr.sz = cpu_to_be16(MLX5E_XDP_MIN_INLINE);
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dma_len -= MLX5E_XDP_MIN_INLINE;
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dma_addr += MLX5E_XDP_MIN_INLINE;
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dseg++;
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}
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/* write the dma part */
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dseg->addr = cpu_to_be64(dma_addr);
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dseg->byte_count = cpu_to_be32(dma_len);
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cseg->opmod_idx_opcode = cpu_to_be32((sq->pc << 8) | MLX5_OPCODE_SEND);
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sq->pc++;
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sq->doorbell_cseg = cseg;
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mlx5e_xdpi_fifo_push(&sq->db.xdpi_fifo, xdpi);
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stats->xmit++;
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return true;
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}
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static void mlx5e_free_xdpsq_desc(struct mlx5e_xdpsq *sq,
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struct mlx5e_xdp_wqe_info *wi,
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u32 *xsk_frames,
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bool recycle)
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{
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struct mlx5e_xdp_info_fifo *xdpi_fifo = &sq->db.xdpi_fifo;
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u16 i;
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for (i = 0; i < wi->num_pkts; i++) {
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struct mlx5e_xdp_info xdpi = mlx5e_xdpi_fifo_pop(xdpi_fifo);
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switch (xdpi.mode) {
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case MLX5E_XDP_XMIT_MODE_FRAME:
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/* XDP_TX from the XSK RQ and XDP_REDIRECT */
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dma_unmap_single(sq->pdev, xdpi.frame.dma_addr,
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xdpi.frame.xdpf->len, DMA_TO_DEVICE);
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xdp_return_frame(xdpi.frame.xdpf);
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break;
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case MLX5E_XDP_XMIT_MODE_PAGE:
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/* XDP_TX from the regular RQ */
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mlx5e_page_release_dynamic(xdpi.page.rq, &xdpi.page.di, recycle);
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break;
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case MLX5E_XDP_XMIT_MODE_XSK:
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/* AF_XDP send */
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(*xsk_frames)++;
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break;
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default:
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WARN_ON_ONCE(true);
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}
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}
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}
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bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq)
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{
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struct mlx5e_xdpsq *sq;
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struct mlx5_cqe64 *cqe;
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u32 xsk_frames = 0;
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u16 sqcc;
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int i;
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sq = container_of(cq, struct mlx5e_xdpsq, cq);
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if (unlikely(!test_bit(MLX5E_SQ_STATE_ENABLED, &sq->state)))
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return false;
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cqe = mlx5_cqwq_get_cqe(&cq->wq);
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if (!cqe)
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return false;
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/* sq->cc must be updated only after mlx5_cqwq_update_db_record(),
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* otherwise a cq overrun may occur
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*/
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sqcc = sq->cc;
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i = 0;
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do {
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struct mlx5e_xdp_wqe_info *wi;
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u16 wqe_counter, ci;
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bool last_wqe;
|
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mlx5_cqwq_pop(&cq->wq);
|
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wqe_counter = be16_to_cpu(cqe->wqe_counter);
|
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do {
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last_wqe = (sqcc == wqe_counter);
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ci = mlx5_wq_cyc_ctr2ix(&sq->wq, sqcc);
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wi = &sq->db.wqe_info[ci];
|
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sqcc += wi->num_wqebbs;
|
|
mlx5e_free_xdpsq_desc(sq, wi, &xsk_frames, true);
|
} while (!last_wqe);
|
|
if (unlikely(get_cqe_opcode(cqe) != MLX5_CQE_REQ)) {
|
netdev_WARN_ONCE(sq->channel->netdev,
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"Bad OP in XDPSQ CQE: 0x%x\n",
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get_cqe_opcode(cqe));
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mlx5e_dump_error_cqe(&sq->cq, sq->sqn,
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(struct mlx5_err_cqe *)cqe);
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mlx5_wq_cyc_wqe_dump(&sq->wq, ci, wi->num_wqebbs);
|
}
|
} while ((++i < MLX5E_TX_CQ_POLL_BUDGET) && (cqe = mlx5_cqwq_get_cqe(&cq->wq)));
|
|
if (xsk_frames)
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xsk_tx_completed(sq->xsk_pool, xsk_frames);
|
|
sq->stats->cqes += i;
|
|
mlx5_cqwq_update_db_record(&cq->wq);
|
|
/* ensure cq space is freed before enabling more cqes */
|
wmb();
|
|
sq->cc = sqcc;
|
return (i == MLX5E_TX_CQ_POLL_BUDGET);
|
}
|
|
void mlx5e_free_xdpsq_descs(struct mlx5e_xdpsq *sq)
|
{
|
u32 xsk_frames = 0;
|
|
while (sq->cc != sq->pc) {
|
struct mlx5e_xdp_wqe_info *wi;
|
u16 ci;
|
|
ci = mlx5_wq_cyc_ctr2ix(&sq->wq, sq->cc);
|
wi = &sq->db.wqe_info[ci];
|
|
sq->cc += wi->num_wqebbs;
|
|
mlx5e_free_xdpsq_desc(sq, wi, &xsk_frames, false);
|
}
|
|
if (xsk_frames)
|
xsk_tx_completed(sq->xsk_pool, xsk_frames);
|
}
|
|
int mlx5e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
|
u32 flags)
|
{
|
struct mlx5e_priv *priv = netdev_priv(dev);
|
struct mlx5e_xdpsq *sq;
|
int drops = 0;
|
int sq_num;
|
int i;
|
|
/* this flag is sufficient, no need to test internal sq state */
|
if (unlikely(!mlx5e_xdp_tx_is_enabled(priv)))
|
return -ENETDOWN;
|
|
if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
|
return -EINVAL;
|
|
sq_num = smp_processor_id();
|
|
if (unlikely(sq_num >= priv->channels.num))
|
return -ENXIO;
|
|
sq = &priv->channels.c[sq_num]->xdpsq;
|
|
for (i = 0; i < n; i++) {
|
struct xdp_frame *xdpf = frames[i];
|
struct mlx5e_xmit_data xdptxd;
|
struct mlx5e_xdp_info xdpi;
|
bool ret;
|
|
xdptxd.data = xdpf->data;
|
xdptxd.len = xdpf->len;
|
xdptxd.dma_addr = dma_map_single(sq->pdev, xdptxd.data,
|
xdptxd.len, DMA_TO_DEVICE);
|
|
if (unlikely(dma_mapping_error(sq->pdev, xdptxd.dma_addr))) {
|
xdp_return_frame_rx_napi(xdpf);
|
drops++;
|
continue;
|
}
|
|
xdpi.mode = MLX5E_XDP_XMIT_MODE_FRAME;
|
xdpi.frame.xdpf = xdpf;
|
xdpi.frame.dma_addr = xdptxd.dma_addr;
|
|
ret = INDIRECT_CALL_2(sq->xmit_xdp_frame, mlx5e_xmit_xdp_frame_mpwqe,
|
mlx5e_xmit_xdp_frame, sq, &xdptxd, &xdpi, 0);
|
if (unlikely(!ret)) {
|
dma_unmap_single(sq->pdev, xdptxd.dma_addr,
|
xdptxd.len, DMA_TO_DEVICE);
|
xdp_return_frame_rx_napi(xdpf);
|
drops++;
|
}
|
}
|
|
if (flags & XDP_XMIT_FLUSH) {
|
if (sq->mpwqe.wqe)
|
mlx5e_xdp_mpwqe_complete(sq);
|
mlx5e_xmit_xdp_doorbell(sq);
|
}
|
|
return n - drops;
|
}
|
|
void mlx5e_xdp_rx_poll_complete(struct mlx5e_rq *rq)
|
{
|
struct mlx5e_xdpsq *xdpsq = rq->xdpsq;
|
|
if (xdpsq->mpwqe.wqe)
|
mlx5e_xdp_mpwqe_complete(xdpsq);
|
|
mlx5e_xmit_xdp_doorbell(xdpsq);
|
|
if (test_bit(MLX5E_RQ_FLAG_XDP_REDIRECT, rq->flags)) {
|
xdp_do_flush_map();
|
__clear_bit(MLX5E_RQ_FLAG_XDP_REDIRECT, rq->flags);
|
}
|
}
|
|
void mlx5e_set_xmit_fp(struct mlx5e_xdpsq *sq, bool is_mpw)
|
{
|
sq->xmit_xdp_frame_check = is_mpw ?
|
mlx5e_xmit_xdp_frame_check_mpwqe : mlx5e_xmit_xdp_frame_check;
|
sq->xmit_xdp_frame = is_mpw ?
|
mlx5e_xmit_xdp_frame_mpwqe : mlx5e_xmit_xdp_frame;
|
}
|
