net/mlx5: fix multi segment packet send

Dseg pointer is not initialized when the first segment is inlined
causing a segmentation fault in such situation.

Fixes: 2a66cf378954 ("net/mlx5: support inline send")

Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>

diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index 0aa2da9..0e75561 100644 (file)
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -484,7 +484,7 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
                                assert(addr <= addr_end);
                        }
                        /*
-                        * 2 DWORDs consumed by the WQE header + 1 DSEG +
+                        * 2 DWORDs consumed by the WQE header + ETH segment +
                         * the size of the inline part of the packet.
                         */
                        ds = 2 + MLX5_WQE_DS(pkt_inline_sz - 2);
@@ -499,6 +499,10 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
                        } else if (!segs_n) {
                                goto next_pkt;
                        } else {
+                               /* dseg will be advance as part of next_seg */
+                               dseg = (volatile rte_v128u32_t *)
+                                       ((uintptr_t)wqe +
+                                        ((ds - 1) * MLX5_WQE_DWORD_SIZE));
                                goto next_seg;
                        }
                } else {