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net/mlx5e: Move XDP related code into new XDP files

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Take XDP code out of the general EN header and RX file into
new XDP files.

Currently, XDP-SQ resides only within an RQ and used from a
single flow (XDP_TX) triggered upon RX completions.
In a downstream patch, additional type of XDP-SQ instances will be
presented and used for the XDP_REDIRECT flow, totally unrelated to
the RX context.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Tariq Toukan 2018-07-15 10:28:44 +03:00 committed by Saeed Mahameed
parent a26a5bdf3e
commit 159d213134
7 changed files with 293 additions and 215 deletions
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2
drivers/net/ethernet/mellanox/mlx5/core/Makefile
View File

@ -14,7 +14,7 @@ mlx5_core-$(CONFIG_MLX5_FPGA) += fpga/cmd.o fpga/core.o fpga/conn.o fpga/sdk.o \
fpga/ipsec.o fpga/tls.o
mlx5_core-$(CONFIG_MLX5_CORE_EN) += en_main.o en_common.o en_fs.o en_ethtool.o \
en_tx.o en_rx.o en_dim.o en_txrx.o en_stats.o vxlan.o \
en_tx.o en_rx.o en_dim.o en_txrx.o en/xdp.o en_stats.o vxlan.o \
en_arfs.o en_fs_ethtool.o en_selftest.o en/port.o
mlx5_core-$(CONFIG_MLX5_MPFS) += lib/mpfs.o

9
drivers/net/ethernet/mellanox/mlx5/core/en.h
View File

@ -72,8 +72,6 @@ struct page_pool;
#define MLX5_RX_HEADROOM NET_SKB_PAD
#define MLX5_SKB_FRAG_SZ(len) (SKB_DATA_ALIGN(len) + \
SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
#define MLX5E_XDP_MAX_MTU ((int)(PAGE_SIZE - \
MLX5_SKB_FRAG_SZ(XDP_PACKET_HEADROOM)))
#define MLX5_MPWRQ_MIN_LOG_STRIDE_SZ(mdev) \
(6 + MLX5_CAP_GEN(mdev, cache_line_128byte)) /* HW restriction */
@ -149,10 +147,6 @@ struct page_pool;
(DIV_ROUND_UP(MLX5E_UMR_WQE_INLINE_SZ, MLX5_SEND_WQE_BB))
#define MLX5E_ICOSQ_MAX_WQEBBS MLX5E_UMR_WQEBBS
#define MLX5E_XDP_MIN_INLINE (ETH_HLEN + VLAN_HLEN)
#define MLX5E_XDP_TX_DS_COUNT \
((sizeof(struct mlx5e_tx_wqe) / MLX5_SEND_WQE_DS) + 1 /* SG DS */)
#define MLX5E_NUM_MAIN_GROUPS 9
#define MLX5E_MSG_LEVEL NETIF_MSG_LINK
@ -878,14 +872,13 @@ void mlx5e_cq_error_event(struct mlx5_core_cq *mcq, enum mlx5_event event);
int mlx5e_napi_poll(struct napi_struct *napi, int budget);
bool mlx5e_poll_tx_cq(struct mlx5e_cq *cq, int napi_budget);
int mlx5e_poll_rx_cq(struct mlx5e_cq *cq, int budget);
bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq);
void mlx5e_free_txqsq_descs(struct mlx5e_txqsq *sq);
void mlx5e_free_xdpsq_descs(struct mlx5e_xdpsq *sq);
bool mlx5e_check_fragmented_striding_rq_cap(struct mlx5_core_dev *mdev);
bool mlx5e_striding_rq_possible(struct mlx5_core_dev *mdev,
struct mlx5e_params *params);
void mlx5e_page_dma_unmap(struct mlx5e_rq *rq, struct mlx5e_dma_info *dma_info);
void mlx5e_page_release(struct mlx5e_rq *rq, struct mlx5e_dma_info *dma_info,
bool recycle);
void mlx5e_handle_rx_cqe(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe);

225
drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c Normal file
View File

@ -0,0 +1,225 @@
/*
* Copyright (c) 2018, Mellanox Technologies. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/bpf_trace.h>
#include "en/xdp.h"
/* returns true if packet was consumed by xdp */
bool mlx5e_xdp_handle(struct mlx5e_rq *rq, struct mlx5e_dma_info *di,
void *va, u16 *rx_headroom, u32 *len)
{
struct bpf_prog *prog = READ_ONCE(rq->xdp_prog);
struct xdp_buff xdp;
u32 act;
int err;
if (!prog)
return false;
xdp.data = va + *rx_headroom;
xdp_set_data_meta_invalid(&xdp);
xdp.data_end = xdp.data + *len;
xdp.data_hard_start = va;
xdp.rxq = &rq->xdp_rxq;
act = bpf_prog_run_xdp(prog, &xdp);
switch (act) {
case XDP_PASS:
*rx_headroom = xdp.data - xdp.data_hard_start;
*len = xdp.data_end - xdp.data;
return false;
case XDP_TX:
if (unlikely(!mlx5e_xmit_xdp_frame(rq, di, &xdp)))
trace_xdp_exception(rq->netdev, prog, act);
return true;
case XDP_REDIRECT:
/* When XDP enabled then page-refcnt==1 here */
err = xdp_do_redirect(rq->netdev, &xdp, prog);
if (!err) {
__set_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags);
rq->xdpsq.db.redirect_flush = true;
mlx5e_page_dma_unmap(rq, di);
}
return true;
default:
bpf_warn_invalid_xdp_action(act);
case XDP_ABORTED:
trace_xdp_exception(rq->netdev, prog, act);
case XDP_DROP:
rq->stats->xdp_drop++;
return true;
}
}
bool mlx5e_xmit_xdp_frame(struct mlx5e_rq *rq, struct mlx5e_dma_info *di,
const struct xdp_buff *xdp)
{
struct mlx5e_xdpsq *sq = &rq->xdpsq;
struct mlx5_wq_cyc *wq = &sq->wq;
u16 pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
struct mlx5e_tx_wqe *wqe = mlx5_wq_cyc_get_wqe(wq, pi);
struct mlx5_wqe_ctrl_seg *cseg = &wqe->ctrl;
struct mlx5_wqe_eth_seg *eseg = &wqe->eth;
struct mlx5_wqe_data_seg *dseg;
ptrdiff_t data_offset = xdp->data - xdp->data_hard_start;
dma_addr_t dma_addr = di->addr + data_offset;
unsigned int dma_len = xdp->data_end - xdp->data;
struct mlx5e_rq_stats *stats = rq->stats;
prefetchw(wqe);
if (unlikely(dma_len < MLX5E_XDP_MIN_INLINE || rq->hw_mtu < dma_len)) {
stats->xdp_drop++;
return false;
}
if (unlikely(!mlx5e_wqc_has_room_for(wq, sq->cc, sq->pc, 1))) {
if (sq->db.doorbell) {
/* SQ is full, ring doorbell */
mlx5e_xmit_xdp_doorbell(sq);
sq->db.doorbell = false;
}
stats->xdp_tx_full++;
return false;
}
dma_sync_single_for_device(sq->pdev, dma_addr, dma_len, PCI_DMA_TODEVICE);
cseg->fm_ce_se = 0;
dseg = (struct mlx5_wqe_data_seg *)eseg + 1;
/* copy the inline part if required */
if (sq->min_inline_mode != MLX5_INLINE_MODE_NONE) {
memcpy(eseg->inline_hdr.start, xdp->data, MLX5E_XDP_MIN_INLINE);
eseg->inline_hdr.sz = cpu_to_be16(MLX5E_XDP_MIN_INLINE);
dma_len -= MLX5E_XDP_MIN_INLINE;
dma_addr += MLX5E_XDP_MIN_INLINE;
dseg++;
}
/* write the dma part */
dseg->addr = cpu_to_be64(dma_addr);
dseg->byte_count = cpu_to_be32(dma_len);
cseg->opmod_idx_opcode = cpu_to_be32((sq->pc << 8) | MLX5_OPCODE_SEND);
/* move page to reference to sq responsibility,
* and mark so it's not put back in page-cache.
*/
__set_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags); /* non-atomic */
sq->db.di[pi] = *di;
sq->pc++;
sq->db.doorbell = true;
stats->xdp_tx++;
return true;
}
bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq)
{
struct mlx5e_xdpsq *sq;
struct mlx5_cqe64 *cqe;
struct mlx5e_rq *rq;
u16 sqcc;
int i;
sq = container_of(cq, struct mlx5e_xdpsq, cq);
if (unlikely(!test_bit(MLX5E_SQ_STATE_ENABLED, &sq->state)))
return false;
cqe = mlx5_cqwq_get_cqe(&cq->wq);
if (!cqe)
return false;
rq = container_of(sq, struct mlx5e_rq, xdpsq);
/* sq->cc must be updated only after mlx5_cqwq_update_db_record(),
* otherwise a cq overrun may occur
*/
sqcc = sq->cc;
i = 0;
do {
u16 wqe_counter;
bool last_wqe;
mlx5_cqwq_pop(&cq->wq);
wqe_counter = be16_to_cpu(cqe->wqe_counter);
do {
struct mlx5e_dma_info *di;
u16 ci;
last_wqe = (sqcc == wqe_counter);
ci = mlx5_wq_cyc_ctr2ix(&sq->wq, sqcc);
di = &sq->db.di[ci];
sqcc++;
/* Recycle RX page */
mlx5e_page_release(rq, di, true);
} while (!last_wqe);
} while ((++i < MLX5E_TX_CQ_POLL_BUDGET) && (cqe = mlx5_cqwq_get_cqe(&cq->wq)));
rq->stats->xdp_tx_cqe += 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)
{
struct mlx5e_rq *rq = container_of(sq, struct mlx5e_rq, xdpsq);
struct mlx5e_dma_info *di;
u16 ci;
while (sq->cc != sq->pc) {
ci = mlx5_wq_cyc_ctr2ix(&sq->wq, sq->cc);
di = &sq->db.di[ci];
sq->cc++;
mlx5e_page_release(rq, di, false);
}
}

62
drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h Normal file
View File

@ -0,0 +1,62 @@
/*
* Copyright (c) 2018, Mellanox Technologies. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef __MLX5_EN_XDP_H__
#define __MLX5_EN_XDP_H__
#include "en.h"
#define MLX5E_XDP_MAX_MTU ((int)(PAGE_SIZE - \
MLX5_SKB_FRAG_SZ(XDP_PACKET_HEADROOM)))
#define MLX5E_XDP_MIN_INLINE (ETH_HLEN + VLAN_HLEN)
#define MLX5E_XDP_TX_DS_COUNT \
((sizeof(struct mlx5e_tx_wqe) / MLX5_SEND_WQE_DS) + 1 /* SG DS */)
bool mlx5e_xdp_handle(struct mlx5e_rq *rq, struct mlx5e_dma_info *di,
void *va, u16 *rx_headroom, u32 *len);
bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq);
void mlx5e_free_xdpsq_descs(struct mlx5e_xdpsq *sq);
bool mlx5e_xmit_xdp_frame(struct mlx5e_rq *rq, struct mlx5e_dma_info *di,
const struct xdp_buff *xdp);
static inline void mlx5e_xmit_xdp_doorbell(struct mlx5e_xdpsq *sq)
{
struct mlx5_wq_cyc *wq = &sq->wq;
struct mlx5e_tx_wqe *wqe;
u16 pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc - 1); /* last pi */
wqe = mlx5_wq_cyc_get_wqe(wq, pi);
mlx5e_notify_hw(wq, sq->pc, sq->uar_map, &wqe->ctrl);
}
#endif

1
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
View File

@ -47,6 +47,7 @@
#include "accel/tls.h"
#include "vxlan.h"
#include "en/port.h"
#include "en/xdp.h"
struct mlx5e_rq_param {
u32 rqc[MLX5_ST_SZ_DW(rqc)];

208
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
View File

@ -34,7 +34,6 @@
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/tcp.h>
#include <linux/bpf_trace.h>
#include <net/busy_poll.h>
#include <net/ip6_checksum.h>
#include <net/page_pool.h>
@ -46,6 +45,7 @@
#include "en_accel/ipsec_rxtx.h"
#include "en_accel/tls_rxtx.h"
#include "lib/clock.h"
#include "en/xdp.h"
static inline bool mlx5e_rx_hw_stamp(struct hwtstamp_config *config)
{
@ -239,8 +239,7 @@ static inline int mlx5e_page_alloc_mapped(struct mlx5e_rq *rq,
return 0;
}
static void mlx5e_page_dma_unmap(struct mlx5e_rq *rq,
struct mlx5e_dma_info *dma_info)
void mlx5e_page_dma_unmap(struct mlx5e_rq *rq, struct mlx5e_dma_info *dma_info)
{
dma_unmap_page(rq->pdev, dma_info->addr, PAGE_SIZE, rq->buff.map_dir);
}
@ -850,135 +849,6 @@ static inline void mlx5e_complete_rx_cqe(struct mlx5e_rq *rq,
mlx5e_build_rx_skb(cqe, cqe_bcnt, rq, skb);
}
static inline void mlx5e_xmit_xdp_doorbell(struct mlx5e_xdpsq *sq)
{
struct mlx5_wq_cyc *wq = &sq->wq;
struct mlx5e_tx_wqe *wqe;
u16 pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc - 1); /* last pi */
wqe = mlx5_wq_cyc_get_wqe(wq, pi);
mlx5e_notify_hw(wq, sq->pc, sq->uar_map, &wqe->ctrl);
}
static inline bool mlx5e_xmit_xdp_frame(struct mlx5e_rq *rq,
struct mlx5e_dma_info *di,
const struct xdp_buff *xdp)
{
struct mlx5e_xdpsq *sq = &rq->xdpsq;
struct mlx5_wq_cyc *wq = &sq->wq;
u16 pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
struct mlx5e_tx_wqe *wqe = mlx5_wq_cyc_get_wqe(wq, pi);
struct mlx5_wqe_ctrl_seg *cseg = &wqe->ctrl;
struct mlx5_wqe_eth_seg *eseg = &wqe->eth;
struct mlx5_wqe_data_seg *dseg;
ptrdiff_t data_offset = xdp->data - xdp->data_hard_start;
dma_addr_t dma_addr = di->addr + data_offset;
unsigned int dma_len = xdp->data_end - xdp->data;
struct mlx5e_rq_stats *stats = rq->stats;
prefetchw(wqe);
if (unlikely(dma_len < MLX5E_XDP_MIN_INLINE || rq->hw_mtu < dma_len)) {
stats->xdp_drop++;
return false;
}
if (unlikely(!mlx5e_wqc_has_room_for(wq, sq->cc, sq->pc, 1))) {
if (sq->db.doorbell) {
/* SQ is full, ring doorbell */
mlx5e_xmit_xdp_doorbell(sq);
sq->db.doorbell = false;
}
stats->xdp_tx_full++;
return false;
}
dma_sync_single_for_device(sq->pdev, dma_addr, dma_len, PCI_DMA_TODEVICE);
cseg->fm_ce_se = 0;
dseg = (struct mlx5_wqe_data_seg *)eseg + 1;
/* copy the inline part if required */
if (sq->min_inline_mode != MLX5_INLINE_MODE_NONE) {
memcpy(eseg->inline_hdr.start, xdp->data, MLX5E_XDP_MIN_INLINE);
eseg->inline_hdr.sz = cpu_to_be16(MLX5E_XDP_MIN_INLINE);
dma_len -= MLX5E_XDP_MIN_INLINE;
dma_addr += MLX5E_XDP_MIN_INLINE;
dseg++;
}
/* write the dma part */
dseg->addr = cpu_to_be64(dma_addr);
dseg->byte_count = cpu_to_be32(dma_len);
cseg->opmod_idx_opcode = cpu_to_be32((sq->pc << 8) | MLX5_OPCODE_SEND);
/* move page to reference to sq responsibility,
* and mark so it's not put back in page-cache.
*/
__set_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags); /* non-atomic */
sq->db.di[pi] = *di;
sq->pc++;
sq->db.doorbell = true;
stats->xdp_tx++;
return true;
}
/* returns true if packet was consumed by xdp */
static inline bool mlx5e_xdp_handle(struct mlx5e_rq *rq,
struct mlx5e_dma_info *di,
void *va, u16 *rx_headroom, u32 *len)
{
struct bpf_prog *prog = READ_ONCE(rq->xdp_prog);
struct xdp_buff xdp;
u32 act;
int err;
if (!prog)
return false;
xdp.data = va + *rx_headroom;
xdp_set_data_meta_invalid(&xdp);
xdp.data_end = xdp.data + *len;
xdp.data_hard_start = va;
xdp.rxq = &rq->xdp_rxq;
act = bpf_prog_run_xdp(prog, &xdp);
switch (act) {
case XDP_PASS:
*rx_headroom = xdp.data - xdp.data_hard_start;
*len = xdp.data_end - xdp.data;
return false;
case XDP_TX:
if (unlikely(!mlx5e_xmit_xdp_frame(rq, di, &xdp)))
trace_xdp_exception(rq->netdev, prog, act);
return true;
case XDP_REDIRECT:
/* When XDP enabled then page-refcnt==1 here */
err = xdp_do_redirect(rq->netdev, &xdp, prog);
if (!err) {
__set_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags);
rq->xdpsq.db.redirect_flush = true;
mlx5e_page_dma_unmap(rq, di);
}
return true;
default:
bpf_warn_invalid_xdp_action(act);
case XDP_ABORTED:
trace_xdp_exception(rq->netdev, prog, act);
case XDP_DROP:
rq->stats->xdp_drop++;
return true;
}
}
static inline
struct sk_buff *mlx5e_build_linear_skb(struct mlx5e_rq *rq, void *va,
u32 frag_size, u16 headroom,
@ -1349,80 +1219,6 @@ int mlx5e_poll_rx_cq(struct mlx5e_cq *cq, int budget)
return work_done;
}
bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq)
{
struct mlx5e_xdpsq *sq;
struct mlx5_cqe64 *cqe;
struct mlx5e_rq *rq;
u16 sqcc;
int i;
sq = container_of(cq, struct mlx5e_xdpsq, cq);
if (unlikely(!test_bit(MLX5E_SQ_STATE_ENABLED, &sq->state)))
return false;
cqe = mlx5_cqwq_get_cqe(&cq->wq);
if (!cqe)
return false;
rq = container_of(sq, struct mlx5e_rq, xdpsq);
/* sq->cc must be updated only after mlx5_cqwq_update_db_record(),
* otherwise a cq overrun may occur
*/
sqcc = sq->cc;
i = 0;
do {
u16 wqe_counter;
bool last_wqe;
mlx5_cqwq_pop(&cq->wq);
wqe_counter = be16_to_cpu(cqe->wqe_counter);
do {
struct mlx5e_dma_info *di;
u16 ci;
last_wqe = (sqcc == wqe_counter);
ci = mlx5_wq_cyc_ctr2ix(&sq->wq, sqcc);
di = &sq->db.di[ci];
sqcc++;
/* Recycle RX page */
mlx5e_page_release(rq, di, true);
} while (!last_wqe);
} while ((++i < MLX5E_TX_CQ_POLL_BUDGET) && (cqe = mlx5_cqwq_get_cqe(&cq->wq)));
rq->stats->xdp_tx_cqe += 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)
{
struct mlx5e_rq *rq = container_of(sq, struct mlx5e_rq, xdpsq);
struct mlx5e_dma_info *di;
u16 ci;
while (sq->cc != sq->pc) {
ci = mlx5_wq_cyc_ctr2ix(&sq->wq, sq->cc);
di = &sq->db.di[ci];
sq->cc++;
mlx5e_page_release(rq, di, false);
}
}
#ifdef CONFIG_MLX5_CORE_IPOIB
#define MLX5_IB_GRH_DGID_OFFSET 24

1
drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c
View File

@ -32,6 +32,7 @@
#include <linux/irq.h>
#include "en.h"
#include "en/xdp.h"
static inline bool mlx5e_channel_no_affinity_change(struct mlx5e_channel *c)
{