The jumbo frame uses the 'RTE_ETHER_MAX_LEN' as boundary condition.
If the Ether overhead is larger than 18 when it supports VLAN tag,
that will cause the jumbo flag rx offload is wrong when MTU size is
'RTE_ETHER_MTU'.
This fix will normalize the boundary condition with 'RTE_ETHER_MTU'
and overhead even though current overhead is 18.
Fixes: 4b2eff452d2e ("cxgbe: enable jumbo frames")
Fixes: 0ec33be4c857 ("cxgbe: allow to change mtu")
Signed-off-by: Steve Yang <stevex.y...@intel.com>
---
drivers/net/cxgbe/cxgbe.h | 4 ++++
drivers/net/cxgbe/cxgbe_ethdev.c | 4 ++--
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/net/cxgbe/cxgbe.h b/drivers/net/cxgbe/cxgbe.h
index ef62af1c3f..7c89a028bf 100644
--- a/drivers/net/cxgbe/cxgbe.h
+++ b/drivers/net/cxgbe/cxgbe.h
@@ -19,6 +19,10 @@
#define CXGBE_MAX_RX_PKTLEN (9000 + RTE_ETHER_HDR_LEN + \
RTE_ETHER_CRC_LEN) /* max pkt */
+/* The max frame size with default MTU */
+#define CXGBE_ETH_MAX_LEN (RTE_ETHER_MTU + \
+ RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN)
+
/* Max poll time is 100 * 100msec = 10 sec */
#define CXGBE_LINK_STATUS_POLL_MS 100 /* 100ms */
#define CXGBE_LINK_STATUS_POLL_CNT 100 /* Max number of times to poll */
diff --git a/drivers/net/cxgbe/cxgbe_ethdev.c b/drivers/net/cxgbe/cxgbe_ethdev.c
index 98d0362fa3..480d6f58a8 100644
--- a/drivers/net/cxgbe/cxgbe_ethdev.c
+++ b/drivers/net/cxgbe/cxgbe_ethdev.c
@@ -300,7 +300,7 @@ int cxgbe_dev_mtu_set(struct rte_eth_dev *eth_dev, uint16_t
mtu)
return -EINVAL;
/* set to jumbo mode if needed */
- if (new_mtu > RTE_ETHER_MAX_LEN)
+ if (new_mtu > CXGBE_ETH_MAX_LEN)
eth_dev->data->dev_conf.rxmode.offloads |=
DEV_RX_OFFLOAD_JUMBO_FRAME;
else
@@ -669,7 +669,7 @@ int cxgbe_dev_rx_queue_setup(struct rte_eth_dev *eth_dev,
rxq->fl.size = temp_nb_desc;
/* Set to jumbo mode if necessary */
- if (pkt_len > RTE_ETHER_MAX_LEN)
+ if (pkt_len > CXGBE_ETH_MAX_LEN)
eth_dev->data->dev_conf.rxmode.offloads |=
DEV_RX_OFFLOAD_JUMBO_FRAME;
else
--
2.17.1
