blob: 8e96260fce1df3496cd33d5f46bda7765902052f [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/* Copyright (c) 2019 Mellanox Technologies. */
#include "tx.h"
#include "pool.h"
#include "en/xdp.h"
#include "en/params.h"
#include <net/xdp_sock_drv.h>
int mlx5e_xsk_wakeup(struct net_device *dev, u32 qid, u32 flags)
struct mlx5e_priv *priv = netdev_priv(dev);
struct mlx5e_params *params = &priv->channels.params;
struct mlx5e_channel *c;
u16 ix;
if (unlikely(!mlx5e_xdp_is_active(priv)))
return -ENETDOWN;
if (unlikely(!mlx5e_qid_get_ch_if_in_group(params, qid, MLX5E_RQ_GROUP_XSK, &ix)))
return -EINVAL;
c = priv->channels.c[ix];
if (unlikely(!test_bit(MLX5E_CHANNEL_STATE_XSK, c->state)))
return -ENXIO;
if (!napi_if_scheduled_mark_missed(&c->napi)) {
/* To avoid WQE overrun, don't post a NOP if async_icosq is not
* active and not polled by NAPI. Return 0, because the upcoming
* activate will trigger the IRQ for us.
if (unlikely(!test_bit(MLX5E_SQ_STATE_ENABLED, &c->async_icosq.state)))
return 0;
if (test_and_set_bit(MLX5E_SQ_STATE_PENDING_XSK_TX, &c->async_icosq.state))
return 0;
return 0;
/* When TX fails (because of the size of the packet), we need to get completions
* in order, so post a NOP to get a CQE. Since AF_XDP doesn't distinguish
* between successful TX and errors, handling in mlx5e_poll_xdpsq_cq is the
* same.
static void mlx5e_xsk_tx_post_err(struct mlx5e_xdpsq *sq,
struct mlx5e_xdp_info *xdpi)
u16 pi = mlx5_wq_cyc_ctr2ix(&sq->wq, sq->pc);
struct mlx5e_xdp_wqe_info *wi = &sq->db.wqe_info[pi];
struct mlx5e_tx_wqe *nopwqe;
wi->num_wqebbs = 1;
wi->num_pkts = 1;
nopwqe = mlx5e_post_nop(&sq->wq, sq->sqn, &sq->pc);
mlx5e_xdpi_fifo_push(&sq->db.xdpi_fifo, xdpi);
sq->doorbell_cseg = &nopwqe->ctrl;
bool mlx5e_xsk_tx(struct mlx5e_xdpsq *sq, unsigned int budget)
struct xsk_buff_pool *pool = sq->xsk_pool;
struct mlx5e_xmit_data xdptxd;
struct mlx5e_xdp_info xdpi;
bool work_done = true;
bool flush = false;
xdpi.mode = MLX5E_XDP_XMIT_MODE_XSK;
for (; budget; budget--) {
int check_result = INDIRECT_CALL_2(sq->xmit_xdp_frame_check,
struct xdp_desc desc;
bool ret;
if (unlikely(check_result < 0)) {
work_done = false;
if (!xsk_tx_peek_desc(pool, &desc)) {
/* TX will get stuck until something wakes it up by
* triggering NAPI. Currently it's expected that the
* application calls sendto() if there are consumed, but
* not completed frames.
xdptxd.dma_addr = xsk_buff_raw_get_dma(pool, desc.addr); = xsk_buff_raw_get_data(pool, desc.addr);
xdptxd.len = desc.len;
xsk_buff_raw_dma_sync_for_device(pool, xdptxd.dma_addr, xdptxd.len);
ret = INDIRECT_CALL_2(sq->xmit_xdp_frame, mlx5e_xmit_xdp_frame_mpwqe,
mlx5e_xmit_xdp_frame, sq, &xdptxd, &xdpi, check_result);
if (unlikely(!ret)) {
if (sq->mpwqe.wqe)
mlx5e_xsk_tx_post_err(sq, &xdpi);
flush = true;
if (flush) {
if (sq->mpwqe.wqe)
return !(budget && work_done);