From: Eric Dumazet <edumazet@google.com>
Date: Wed, 15 Apr 2020 09:46:52 -0700
Subject: net/mlx4_en: avoid indirect call in TX completion
Git-commit: 310660a14b74c380b0ef5c12b66933d6a3d1b59f
Patch-mainline: 5.7-rc3
References: networking-stable-20_04_27
Commit 9ecc2d86171a ("net/mlx4_en: add xdp forwarding and data write support")
brought another indirect call in fast path.
Use INDIRECT_CALL_2() helper to avoid the cost of the indirect call
when/if CONFIG_RETPOLINE=y
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Tariq Toukan <tariqt@mellanox.com>
Cc: Willem de Bruijn <willemb@google.com>
Reviewed-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/net/ethernet/mellanox/mlx4/en_tx.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -43,6 +43,7 @@
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/moduleparam.h>
+#include <linux/indirect_call_wrapper.h>
#include "mlx4_en.h"
@@ -264,6 +265,10 @@ static void mlx4_en_stamp_wqe(struct mlx
}
}
+INDIRECT_CALLABLE_DECLARE(u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
+ struct mlx4_en_tx_ring *ring,
+ int index, u64 timestamp,
+ int napi_mode));
u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
struct mlx4_en_tx_ring *ring,
@@ -332,6 +337,11 @@ u32 mlx4_en_free_tx_desc(struct mlx4_en_
return tx_info->nr_txbb;
}
+INDIRECT_CALLABLE_DECLARE(u32 mlx4_en_recycle_tx_desc(struct mlx4_en_priv *priv,
+ struct mlx4_en_tx_ring *ring,
+ int index, u64 timestamp,
+ int napi_mode));
+
u32 mlx4_en_recycle_tx_desc(struct mlx4_en_priv *priv,
struct mlx4_en_tx_ring *ring,
int index, u64 timestamp,
@@ -452,7 +462,9 @@ bool mlx4_en_process_tx_cq(struct net_de
timestamp = mlx4_en_get_cqe_ts(cqe);
/* free next descriptor */
- last_nr_txbb = ring->free_tx_desc(
+ last_nr_txbb = INDIRECT_CALL_2(ring->free_tx_desc,
+ mlx4_en_free_tx_desc,
+ mlx4_en_recycle_tx_desc,
priv, ring, ring_index,
timestamp, napi_budget);