[PATCH 2/2] net/ice: fix TSO with big segments

[David Marchand]

Packets to be segmented with TSO are usually larger than MTU.
Plus, a single segment for the whole packet may be used: in OVS case,
an external rte_malloc'd buffer is used for packets received
from vhost-user ports.

Before this fix, TSO packets were dropped by net/ice with the following
message:
2023-09-18T13:34:31.064Z|00020|dpdk(pmd-c31/id:22)|ERR|ice_prep_pkts():
	INVALID mbuf: bad data_len=[2962]

Remove the check on data_len.

Besides, logging an error level message in a datapath function may
slow down the whole application. It is better not to log anything.

Fixes: ccf33dccf7aa ("net/ice: check illegal packet sizes")
Cc: stable at dpdk.org

Signed-off-by: David Marchand <david.marchand at redhat.com>
---
Note: there may be some followup patch later, as some additional check
has been added in ice_prep_pkts.
For context, see: http://inbox.dpdk.org/dev/CAJFAV8yOa3ShkVdEXHfnmOEmUTwV3e75Bu9U3OqpNc5usTt3Rw@mail.gmail.com/T/#u

---
 drivers/net/ice/ice_rxtx.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/net/ice/ice_rxtx.c b/drivers/net/ice/ice_rxtx.c
index 64c4486b4b..80c4284200 100644
--- a/drivers/net/ice/ice_rxtx.c
+++ b/drivers/net/ice/ice_rxtx.c
@@ -3685,9 +3685,6 @@ ice_prep_pkts(__rte_unused void *tx_queue, struct rte_mbuf **tx_pkts,
 	int i, ret;
 	uint64_t ol_flags;
 	struct rte_mbuf *m;
-	struct ice_tx_queue *txq = tx_queue;
-	struct rte_eth_dev *dev = &rte_eth_devices[txq->port_id];
-	uint16_t max_frame_size = dev->data->mtu + ICE_ETH_OVERHEAD;
 
 	for (i = 0; i < nb_pkts; i++) {
 		m = tx_pkts[i];
@@ -3704,11 +3701,8 @@ ice_prep_pkts(__rte_unused void *tx_queue, struct rte_mbuf **tx_pkts,
 			return i;
 		}
 
-		/* check the data_len in mbuf */
-		if (m->data_len < ICE_TX_MIN_PKT_LEN ||
-			m->data_len > max_frame_size) {
+		if (m->pkt_len < ICE_TX_MIN_PKT_LEN) {
 			rte_errno = EINVAL;
-			PMD_DRV_LOG(ERR, "INVALID mbuf: bad data_len=[%hu]", m->data_len);
 			return i;
 		}
 
-- 
2.41.0