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mlx4: fix available entries in Tx rings

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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: 7fae69eeff ("mlx4: new poll mode driver")

Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
This commit is contained in:
Nelio Laranjeiro 2015-11-23 15:44:41 +01:00 committed by Thomas Monjalon
parent ecbfdbad6e
commit cacd65c8bb
1 changed files with 1 additions and 2 deletions
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3
drivers/net/mlx4/mlx4.c
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@ -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);