[PATCH v4 3/3] net/gve: validate minimum header length for TSO packets

[Joshua Washington <joshwash@google.com>]

In addition to the limits added in commit
03b62d39c1c8 ("net/gve: enforce DQO TSO header and length limits"), TSO
packets also have a minimum header length of 16B. Enforce this limit as
well.

Fixes: 403c671a46b6 ("net/gve: support TSO in DQO RDA")
Cc: stable@dpdk.org

Signed-off-by: Joshua Washington <joshwash@google.com>
Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/gve/base/gve_desc_dqo.h | 1 +
 drivers/net/gve/gve_tx_dqo.c        | 5 +++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/gve/base/gve_desc_dqo.h b/drivers/net/gve/base/gve_desc_dqo.h
index 53e394f01c..c2f7b0caa6 100644
--- a/drivers/net/gve/base/gve_desc_dqo.h
+++ b/drivers/net/gve/base/gve_desc_dqo.h
@@ -14,6 +14,7 @@
 #define GVE_TX_MIN_TSO_MSS_DQO 88
 #define GVE_TX_MIN_PKT_SIZE_DQO 17
 #define GVE_TX_MAX_PKT_SIZE_DQO 9728
+#define GVE_TX_MIN_TSO_HDR_LEN_DQO 16
 #define GVE_TX_MAX_TSO_LEN_DQO ((256 * 1024) - 1)
 
 /* Basic TX descriptor (DTYPE 0x0C) */
diff --git a/drivers/net/gve/gve_tx_dqo.c b/drivers/net/gve/gve_tx_dqo.c
index 78eaef3e3d..72730eb1c5 100644
--- a/drivers/net/gve/gve_tx_dqo.c
+++ b/drivers/net/gve/gve_tx_dqo.c
@@ -139,8 +139,9 @@ gve_tx_validate_pkt_limits(const struct rte_mbuf *tx_pkt, bool is_tso)
 	 * contained in the first segment; the payload must not be empty.
 	 */
 	headlen = tx_pkt->l2_len + tx_pkt->l3_len + tx_pkt->l4_len;
-	if (tx_pkt->l4_len == 0 || headlen > GVE_TX_MAX_HDR_SIZE_DQO ||
-	    tx_pkt->data_len < headlen || tx_pkt->pkt_len <= headlen)
+	if (tx_pkt->l4_len == 0 || headlen < GVE_TX_MIN_TSO_HDR_LEN_DQO ||
+	    headlen > GVE_TX_MAX_HDR_SIZE_DQO || tx_pkt->data_len < headlen ||
+	    tx_pkt->pkt_len <= headlen)
 		return false;
 
 	return tx_pkt->pkt_len - headlen <= GVE_TX_MAX_TSO_LEN_DQO &&
-- 
2.56.0.542.g3ef89b7020-goog