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net/mlx4_en: avoid indirect call in TX completion

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[ Upstream commit 310660a14b74c380b0ef5c12b66933d6a3d1b59f ]

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Dumazet 2020-04-15 09:46:52 -07:00 committed by Greg Kroah-Hartman
parent 49bbf32231
commit befd63a980
1 changed files with 13 additions and 1 deletions
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14
drivers/net/ethernet/mellanox/mlx4/en_tx.c
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@ -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"
@ -261,6 +262,10 @@ static void mlx4_en_stamp_wqe(struct mlx4_en_priv *priv,
}
}
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,
@ -329,6 +334,11 @@ u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
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,
@ -449,7 +459,9 @@ bool mlx4_en_process_tx_cq(struct net_device *dev,
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);