[dpdk-dev] [PATCH] net/enic: fix the size check in Tx prepare handler

[Hyong Youb Kim]

The current code wrongly assumes that packets are non-TSO and ends up
rejecting large TSO packets. Check non-TSO and TSO max packet sizes
separately.

Fixes: 5a12c387405a ("net/enic: check maximum packet size in Tx prepare handler")
Cc: stable at dpdk.org

Signed-off-by: Hyong Youb Kim <hyonkim at cisco.com>
Reviewed-by: John Daley <johndale at cisco.com>
---
 drivers/net/enic/enic_rxtx.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/net/enic/enic_rxtx.c b/drivers/net/enic/enic_rxtx.c
index 5189ee635..0aadd3426 100644
--- a/drivers/net/enic/enic_rxtx.c
+++ b/drivers/net/enic/enic_rxtx.c
@@ -393,11 +393,22 @@ uint16_t enic_prep_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 
 	for (i = 0; i != nb_pkts; i++) {
 		m = tx_pkts[i];
-		if (unlikely(m->pkt_len > ENIC_TX_MAX_PKT_SIZE)) {
-			rte_errno = EINVAL;
-			return i;
-		}
 		ol_flags = m->ol_flags;
+		if (!(ol_flags & PKT_TX_TCP_SEG)) {
+			if (unlikely(m->pkt_len > ENIC_TX_MAX_PKT_SIZE)) {
+				rte_errno = EINVAL;
+				return i;
+			}
+		} else {
+			uint16_t header_len;
+
+			header_len = m->l2_len + m->l3_len + m->l4_len;
+			if (m->tso_segsz + header_len > ENIC_TX_MAX_PKT_SIZE) {
+				rte_errno = EINVAL;
+				return i;
+			}
+		}
+
 		if (ol_flags & wq->tx_offload_notsup_mask) {
 			rte_errno = ENOTSUP;
 			return i;
-- 
2.16.2