diff mbox

[dpdk-dev,06/14] mlx4: fix available entries in TX rings

Message ID 1448289889-9590-7-git-send-email-adrien.mazarguil@6wind.com (mailing list archive)
State Accepted, archived
Headers

Commit Message

Adrien Mazarguil Nov. 23, 2015, 2:44 p.m. UTC 
  From: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>

The number of available entries in TX rings is taken before performing
completion, effectively making rings smaller than they are and causing
TX performance issues under load.

Fixes: 7fae69eeff13 ("mlx4: new poll mode driver")

Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
---
 drivers/net/mlx4/mlx4.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
diff mbox

Patch

diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index 3e05373..4f57e2d 100644
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -1306,7 +1306,6 @@  mlx4_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
 {
 	struct txq *txq = (struct txq *)dpdk_txq;
 	unsigned int elts_head = txq->elts_head;
-	const unsigned int elts_tail = txq->elts_tail;
 	const unsigned int elts_n = txq->elts_n;
 	unsigned int elts_comp_cd = txq->elts_comp_cd;
 	unsigned int elts_comp = 0;
@@ -1316,7 +1315,7 @@  mlx4_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
 
 	assert(elts_comp_cd != 0);
 	txq_complete(txq);
-	max = (elts_n - (elts_head - elts_tail));
+	max = (elts_n - (elts_head - txq->elts_tail));
 	if (max > elts_n)
 		max -= elts_n;
 	assert(max >= 1);