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

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: 6579c27c11a5 ("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>

diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index c336081..4969d18 100644 (file)
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -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);