net/iavf: fix Tx preparation

[ upstream commit 0f536bae86b30e82ba95c279f1d6f9095d7f5b6e ]

1. check nb_segs > Tx ring size for TSO case.
2. report nb_mtu_seg_max and nb_seg_max in dev_info.

Fixes: a2b29a7 ("net/avf: enable basic Rx Tx")

Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Qiming Yang <qiming.yang@intel.com>

drivers/net/iavf/iavf_ethdev.c

@@ -1148,6 +1148,8 @@ iavf_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 		.nb_max = IAVF_MAX_RING_DESC,
 		.nb_min = IAVF_MIN_RING_DESC,
 		.nb_align = IAVF_ALIGN_RING_DESC,
+		.nb_mtu_seg_max = IAVF_TX_MAX_MTU_SEG,
+		.nb_seg_max = IAVF_MAX_RING_DESC,
 	};
 
 	return 0;

drivers/net/iavf/iavf_rxtx.c

@@ -2804,7 +2804,8 @@ iavf_prep_pkts(__rte_unused void *tx_queue, struct rte_mbuf **tx_pkts,
 				return i;
 			}
 		} else if ((m->tso_segsz < IAVF_MIN_TSO_MSS) ||
-			   (m->tso_segsz > IAVF_MAX_TSO_MSS)) {
+			   (m->tso_segsz > IAVF_MAX_TSO_MSS) ||
+			   (m->nb_segs > txq->nb_tx_desc)) {
 			/* MSS outside the range are considered malicious */
 			rte_errno = EINVAL;
 			return i;