net/mlx5: fix TSO segment size

In case on multi segment packet, the TSO segment size
was taken from the last segment. This may lead to incorrect
values in case not all segments are initialized with the field.

Fixing it by taking the value from the first segment.

Fixes: 3f13f8c23a7c ("net/mlx5: support hardware TSO")
Cc: stable@dpdk.org
Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
Acked-by: Yongseok Koh <yskoh@mellanox.com>
Acked-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>

diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index cade625..70314b3 100644 (file)
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -527,6 +527,7 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
                uint16_t ehdr;
                uint8_t cs_flags = 0;
                uint64_t tso = 0;
+               uint16_t tso_segsz = 0;
 #ifdef MLX5_PMD_SOFT_COUNTERS
                uint32_t total_length = 0;
 #endif
@@ -622,6 +623,7 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
 
                                tso_header_sz = buf->l2_len + vlan_sz +
                                                buf->l3_len + buf->l4_len;
+                               tso_segsz = buf->tso_segsz;
 
                                if (is_tunneled && txq->tunnel_en) {
                                        tso_header_sz += buf->outer_l2_len +
@@ -821,7 +823,7 @@ next_pkt:
                        };
                        wqe->eseg = (rte_v128u32_t){
                                0,
-                               cs_flags | (htons(buf->tso_segsz) << 16),
+                               cs_flags | (htons(tso_segsz) << 16),
                                0,
                                (ehdr << 16) | htons(tso_header_sz),
                        };