[dpdk-dev] [PATCH v4 13/22] net/qede: fix the jumbo frame flag condition for mtu set

[Steve Yang]

The jumbo frame uses the 'RTE_ETHER_MAX_LEN' as boundary condition,
but the Ether overhead is larger than 18 when it supports dual VLAN tags.
That will cause the jumbo flag rx offload is wrong when MTU size is
'RTE_ETHER_MTU'.

This fix will change the boundary condition with 'RTE_ETHER_MTU' and
overhead, that perhaps impacts the cases of the jumbo frame related.

Fixes: 200645ac7909 ("net/qede: set MTU")

Cc: Rasesh Mody <rmody at marvell.com>
Cc: Shahed Shaikh <shshaikh at marvell.com>

Signed-off-by: Steve Yang <stevex.yang at intel.com>
---
 drivers/net/qede/qede_ethdev.c | 2 +-
 drivers/net/qede/qede_rxtx.h   | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/qede/qede_ethdev.c b/drivers/net/qede/qede_ethdev.c
index 549013557c..6919378b8e 100644
--- a/drivers/net/qede/qede_ethdev.c
+++ b/drivers/net/qede/qede_ethdev.c
@@ -2367,7 +2367,7 @@ static int qede_set_mtu(struct rte_eth_dev *dev, uint16_t mtu)
 			fp->rxq->rx_buf_size = rc;
 		}
 	}
-	if (max_rx_pkt_len > RTE_ETHER_MAX_LEN)
+	if (frame_size > QEDE_ETH_MAX_LEN)
 		dev->data->dev_conf.rxmode.offloads |= DEV_RX_OFFLOAD_JUMBO_FRAME;
 	else
 		dev->data->dev_conf.rxmode.offloads &= ~DEV_RX_OFFLOAD_JUMBO_FRAME;
diff --git a/drivers/net/qede/qede_rxtx.h b/drivers/net/qede/qede_rxtx.h
index d7ff870b20..fcb564a1bb 100644
--- a/drivers/net/qede/qede_rxtx.h
+++ b/drivers/net/qede/qede_rxtx.h
@@ -71,6 +71,7 @@
 				 + (QEDE_LLC_SNAP_HDR_LEN) + 2)
 
 #define QEDE_MAX_ETHER_HDR_LEN	(RTE_ETHER_HDR_LEN + QEDE_ETH_OVERHEAD)
+#define QEDE_ETH_MAX_LEN	(RTE_ETHER_MTU + QEDE_MAX_ETHER_HDR_LEN)
 
 #define QEDE_RSS_OFFLOAD_ALL    (ETH_RSS_IPV4			|\
 				 ETH_RSS_NONFRAG_IPV4_TCP	|\
-- 
2.17.1