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net/mlx5: fix Tx when first segment size is too short

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First segment size must be at least 18 bytes, packets not respecting this
are silently not sent by the NIC but counted as sent by the PMD.  The only
way to figure out is compiling the PMD in debug mode.

Fixes: 6579c27c11 ("net/mlx5: remove gather loop on segments")
Cc: stable@dpdk.org

Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Acked-by: Yongseok Koh <yskoh@mellanox.com>
This commit is contained in:
Nélio Laranjeiro 2017-03-29 09:51:39 +02:00 committed by Ferruh Yigit
parent 1ef4c3a5c1
commit 959be52e93
1 changed files with 2 additions and 1 deletions
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3
drivers/net/mlx5/mlx5_rxtx.c
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@ -561,7 +561,8 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
#ifdef MLX5_PMD_SOFT_COUNTERS
total_length = length;
#endif
assert(length >= MLX5_WQE_DWORD_SIZE);
if (length < (MLX5_WQE_DWORD_SIZE + 2))
break;
/* Update element. */
(*txq->elts)[elts_head] = buf;
elts_head = (elts_head + 1) & (elts_n - 1);