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net/mlx5e: XDP, Avoid indirect call in TX flow 

Use INDIRECT_CALL_2() helper to avoid the cost of the indirect call
when/if CONFIG_RETPOLINE=y.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Reviewed-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Tariq Toukan 2020-04-30 14:32:45 +03:00 committed by Saeed Mahameed
parent 7ed92f97a1
commit 93761ca17e
3 changed files with 37 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
View File

@ -34,6 +34,7 @@
#include <net/xdp_sock_drv.h> #include <net/xdp_sock_drv.h>
#include "en/xdp.h" #include "en/xdp.h"
#include "en/params.h" #include "en/params.h"
#include <linux/indirect_call_wrapper.h>
int mlx5e_xdp_max_mtu(struct mlx5e_params *params, struct mlx5e_xsk_param *xsk) int mlx5e_xdp_max_mtu(struct mlx5e_params *params, struct mlx5e_xsk_param *xsk)
{ {
@ -114,7 +115,8 @@ mlx5e_xmit_xdp_buff(struct mlx5e_xdpsq *sq, struct mlx5e_rq *rq,
xdpi.page.di = *di; xdpi.page.di = *di;
} }
return sq->xmit_xdp_frame(sq, &xdptxd, &xdpi, 0); return INDIRECT_CALL_2(sq->xmit_xdp_frame, mlx5e_xmit_xdp_frame_mpwqe,
mlx5e_xmit_xdp_frame, sq, &xdptxd, &xdpi, 0);
} }
/* returns true if packet was consumed by xdp */ /* returns true if packet was consumed by xdp */
@ -237,7 +239,7 @@ enum {
MLX5E_XDP_CHECK_START_MPWQE = 2, MLX5E_XDP_CHECK_START_MPWQE = 2,
}; };
static int mlx5e_xmit_xdp_frame_check_mpwqe(struct mlx5e_xdpsq *sq) INDIRECT_CALLABLE_SCOPE int mlx5e_xmit_xdp_frame_check_mpwqe(struct mlx5e_xdpsq *sq)
{ {
if (unlikely(!sq->mpwqe.wqe)) { if (unlikely(!sq->mpwqe.wqe)) {
const u16 stop_room = mlx5e_stop_room_for_wqe(MLX5_SEND_WQE_MAX_WQEBBS); const u16 stop_room = mlx5e_stop_room_for_wqe(MLX5_SEND_WQE_MAX_WQEBBS);
@ -256,10 +258,9 @@ static int mlx5e_xmit_xdp_frame_check_mpwqe(struct mlx5e_xdpsq *sq)
return MLX5E_XDP_CHECK_OK; return MLX5E_XDP_CHECK_OK;
} }
static bool mlx5e_xmit_xdp_frame_mpwqe(struct mlx5e_xdpsq *sq, INDIRECT_CALLABLE_SCOPE bool
struct mlx5e_xdp_xmit_data *xdptxd, mlx5e_xmit_xdp_frame_mpwqe(struct mlx5e_xdpsq *sq, struct mlx5e_xdp_xmit_data *xdptxd,
struct mlx5e_xdp_info *xdpi, struct mlx5e_xdp_info *xdpi, int check_result)
int check_result)
{ {
struct mlx5e_xdp_mpwqe *session = &sq->mpwqe; struct mlx5e_xdp_mpwqe *session = &sq->mpwqe;
struct mlx5e_xdpsq_stats *stats = sq->stats; struct mlx5e_xdpsq_stats *stats = sq->stats;
@ -293,7 +294,7 @@ static bool mlx5e_xmit_xdp_frame_mpwqe(struct mlx5e_xdpsq *sq,
return true; return true;
} }
static int mlx5e_xmit_xdp_frame_check(struct mlx5e_xdpsq *sq) INDIRECT_CALLABLE_SCOPE int mlx5e_xmit_xdp_frame_check(struct mlx5e_xdpsq *sq)
{ {
if (unlikely(!mlx5e_wqc_has_room_for(&sq->wq, sq->cc, sq->pc, 1))) { if (unlikely(!mlx5e_wqc_has_room_for(&sq->wq, sq->cc, sq->pc, 1))) {
/* SQ is full, ring doorbell */ /* SQ is full, ring doorbell */
@ -305,10 +306,9 @@ static int mlx5e_xmit_xdp_frame_check(struct mlx5e_xdpsq *sq)
return MLX5E_XDP_CHECK_OK; return MLX5E_XDP_CHECK_OK;
} }
static bool mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq, INDIRECT_CALLABLE_SCOPE bool
struct mlx5e_xdp_xmit_data *xdptxd, mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq, struct mlx5e_xdp_xmit_data *xdptxd,
struct mlx5e_xdp_info *xdpi, struct mlx5e_xdp_info *xdpi, int check_result)
int check_result)
{ {
struct mlx5_wq_cyc *wq = &sq->wq; struct mlx5_wq_cyc *wq = &sq->wq;
u16 pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc); u16 pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
@ -506,6 +506,7 @@ int mlx5e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
struct xdp_frame *xdpf = frames[i]; struct xdp_frame *xdpf = frames[i];
struct mlx5e_xdp_xmit_data xdptxd; struct mlx5e_xdp_xmit_data xdptxd;
struct mlx5e_xdp_info xdpi; struct mlx5e_xdp_info xdpi;
bool ret;
xdptxd.data = xdpf->data; xdptxd.data = xdpf->data;
xdptxd.len = xdpf->len; xdptxd.len = xdpf->len;
@ -522,7 +523,9 @@ int mlx5e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
xdpi.frame.xdpf = xdpf; xdpi.frame.xdpf = xdpf;
xdpi.frame.dma_addr = xdptxd.dma_addr; xdpi.frame.dma_addr = xdptxd.dma_addr;
if (unlikely(!sq->xmit_xdp_frame(sq, &xdptxd, &xdpi, 0))) { 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, dma_unmap_single(sq->pdev, xdptxd.dma_addr,
xdptxd.len, DMA_TO_DEVICE); xdptxd.len, DMA_TO_DEVICE);
xdp_return_frame_rx_napi(xdpf); xdp_return_frame_rx_napi(xdpf);

13
drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
View File

@ -32,6 +32,8 @@
#ifndef __MLX5_EN_XDP_H__ #ifndef __MLX5_EN_XDP_H__
#define __MLX5_EN_XDP_H__ #define __MLX5_EN_XDP_H__
#include <linux/indirect_call_wrapper.h>
#include "en.h" #include "en.h"
#include "en/txrx.h" #include "en/txrx.h"
@ -70,6 +72,17 @@ void mlx5e_xdp_rx_poll_complete(struct mlx5e_rq *rq);
int mlx5e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames, int mlx5e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
u32 flags); u32 flags);
INDIRECT_CALLABLE_DECLARE(bool mlx5e_xmit_xdp_frame_mpwqe(struct mlx5e_xdpsq *sq,
struct mlx5e_xdp_xmit_data *xdptxd,
struct mlx5e_xdp_info *xdpi,
int check_result));
INDIRECT_CALLABLE_DECLARE(bool mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq,
struct mlx5e_xdp_xmit_data *xdptxd,
struct mlx5e_xdp_info *xdpi,
int check_result));
INDIRECT_CALLABLE_DECLARE(int mlx5e_xmit_xdp_frame_check_mpwqe(struct mlx5e_xdpsq *sq));
INDIRECT_CALLABLE_DECLARE(int mlx5e_xmit_xdp_frame_check(struct mlx5e_xdpsq *sq));
static inline void mlx5e_xdp_tx_enable(struct mlx5e_priv *priv) static inline void mlx5e_xdp_tx_enable(struct mlx5e_priv *priv)
{ {
set_bit(MLX5E_STATE_XDP_TX_ENABLED, &priv->state); set_bit(MLX5E_STATE_XDP_TX_ENABLED, &priv->state);

11
drivers/net/ethernet/mellanox/mlx5/core/en/xsk/tx.c
View File

@ -6,6 +6,7 @@
#include "en/xdp.h" #include "en/xdp.h"
#include "en/params.h" #include "en/params.h"
#include <net/xdp_sock_drv.h> #include <net/xdp_sock_drv.h>
#include <linux/indirect_call_wrapper.h>
int mlx5e_xsk_wakeup(struct net_device *dev, u32 qid, u32 flags) int mlx5e_xsk_wakeup(struct net_device *dev, u32 qid, u32 flags)
{ {
@ -75,8 +76,12 @@ bool mlx5e_xsk_tx(struct mlx5e_xdpsq *sq, unsigned int budget)
xdpi.mode = MLX5E_XDP_XMIT_MODE_XSK; xdpi.mode = MLX5E_XDP_XMIT_MODE_XSK;
for (; budget; budget--) { for (; budget; budget--) {
int check_result = sq->xmit_xdp_frame_check(sq); int check_result = INDIRECT_CALL_2(sq->xmit_xdp_frame_check,
mlx5e_xmit_xdp_frame_check_mpwqe,
mlx5e_xmit_xdp_frame_check,
sq);
struct xdp_desc desc; struct xdp_desc desc;
bool ret;
if (unlikely(check_result < 0)) { if (unlikely(check_result < 0)) {
work_done = false; work_done = false;
@ -98,7 +103,9 @@ bool mlx5e_xsk_tx(struct mlx5e_xdpsq *sq, unsigned int budget)
xsk_buff_raw_dma_sync_for_device(umem, xdptxd.dma_addr, xdptxd.len); xsk_buff_raw_dma_sync_for_device(umem, xdptxd.dma_addr, xdptxd.len);
if (unlikely(!sq->xmit_xdp_frame(sq, &xdptxd, &xdpi, check_result))) { 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) if (sq->mpwqe.wqe)
mlx5e_xdp_mpwqe_complete(sq); mlx5e_xdp_mpwqe_complete(sq);