[dpdk-dev] [EXT] [PATCH v2 12/22] net/octeontx2: fix the jumbo frame flag condition for mtu

[Sunil Kumar Kori]

>-----Original Message-----
>From: Steve Yang <stevex.yang at intel.com>
>Sent: Thursday, December 17, 2020 2:53 PM
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>Subject: [EXT] [PATCH v2 12/22] net/octeontx2: fix the jumbo frame flag
>condition for mtu
>
>External Email
>
>----------------------------------------------------------------------
>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.
>
>Fixes: 0e2efd02db58 ("net/octeontx2: add MTU set operation")
>
>Signed-off-by: Steve Yang <stevex.yang at intel.com>
>---
> drivers/net/octeontx2/otx2_ethdev.h     | 2 ++
> drivers/net/octeontx2/otx2_ethdev_ops.c | 2 +-
> 2 files changed, 3 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/net/octeontx2/otx2_ethdev.h
>b/drivers/net/octeontx2/otx2_ethdev.h
>index 3b9871f4dc..99f0469d89 100644
>--- a/drivers/net/octeontx2/otx2_ethdev.h
>+++ b/drivers/net/octeontx2/otx2_ethdev.h
>@@ -51,6 +51,8 @@
> /* ETH_HLEN+ETH_FCS+2*VLAN_HLEN */
> #define NIX_L2_OVERHEAD \
> 	(RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN + 8)
>+#define NIX_L2_MAX_LEN \
>+	(RTE_ETHER_MTU + NIX_L2_OVERHEAD)
>
> /* HW config of frame size doesn't include FCS */
> #define NIX_MAX_HW_FRS			9212
>diff --git a/drivers/net/octeontx2/otx2_ethdev_ops.c
>b/drivers/net/octeontx2/otx2_ethdev_ops.c
>index b36d37b9f7..963cc285ed 100644
>--- a/drivers/net/octeontx2/otx2_ethdev_ops.c
>+++ b/drivers/net/octeontx2/otx2_ethdev_ops.c
>@@ -58,7 +58,7 @@ otx2_nix_mtu_set(struct rte_eth_dev *eth_dev, uint16_t
>mtu)
> 	if (rc)
> 		return rc;
>
>-	if (frame_size > RTE_ETHER_MAX_LEN)
>+	if (frame_size > NIX_L2_MAX_LEN)
> 		dev->rx_offloads |= DEV_RX_OFFLOAD_JUMBO_FRAME;
> 	else
> 		dev->rx_offloads &= ~DEV_RX_OFFLOAD_JUMBO_FRAME;
>--
>2.17.1

Acked-by: Sunil Kumar Kori <skori at mavell.com>