[dpdk-stable] patch 'net/enetc: fix jumbo frame flag condition for MTU set' has been queued to stable release 20.11.1

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 20.11.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 02/07/21. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/b60c9ab0dcd9fb18c470e8da1e11de2850b29c25

Thanks.

Luca Boccassi

---
>From b60c9ab0dcd9fb18c470e8da1e11de2850b29c25 Mon Sep 17 00:00:00 2001
From: Steve Yang <stevex.yang at intel.com>
Date: Mon, 18 Jan 2021 07:04:25 +0000
Subject: [PATCH] net/enetc: fix jumbo frame flag condition for MTU set

[ upstream commit 4d44217b0641c19e750b57c7392c4531c91dda7f ]

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: 5d5589b0c858 ("net/enetc: support MTU update and jumbo frames")

Signed-off-by: Steve Yang <stevex.yang at intel.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit at intel.com>
---
 drivers/net/enetc/enetc.h        | 4 ++++
 drivers/net/enetc/enetc_ethdev.c | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/enetc/enetc.h b/drivers/net/enetc/enetc.h
index 14ef3bc18b..7163633bce 100644
--- a/drivers/net/enetc/enetc.h
+++ b/drivers/net/enetc/enetc.h
@@ -29,6 +29,10 @@
 /* maximum frame size supported */
 #define ENETC_MAC_MAXFRM_SIZE	9600
 
+/* The max frame size with default MTU */
+#define ENETC_ETH_MAX_LEN (RTE_ETHER_MTU + \
+		RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN)
+
 /*
  * upper_32_bits - return bits 32-63 of a number
  * @n: the number we're accessing
diff --git a/drivers/net/enetc/enetc_ethdev.c b/drivers/net/enetc/enetc_ethdev.c
index 6ff3022874..4d2c9c0474 100644
--- a/drivers/net/enetc/enetc_ethdev.c
+++ b/drivers/net/enetc/enetc_ethdev.c
@@ -677,7 +677,7 @@ enetc_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 		return -EINVAL;
 	}
 
-	if (frame_size > RTE_ETHER_MAX_LEN)
+	if (frame_size > ENETC_ETH_MAX_LEN)
 		dev->data->dev_conf.rxmode.offloads &=
 						DEV_RX_OFFLOAD_JUMBO_FRAME;
 	else
-- 
2.29.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-02-05 11:18:36.504451184 +0000
+++ 0161-net-enetc-fix-jumbo-frame-flag-condition-for-MTU-set.patch	2021-02-05 11:18:29.110696899 +0000
@@ -1 +1 @@
-From 4d44217b0641c19e750b57c7392c4531c91dda7f Mon Sep 17 00:00:00 2001
+From b60c9ab0dcd9fb18c470e8da1e11de2850b29c25 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 4d44217b0641c19e750b57c7392c4531c91dda7f ]
+
@@ -15 +16,0 @@
-Cc: stable at dpdk.org