[dpdk-stable] patch 'net/e1000: 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/8e419ba40ca20a9d1df5256eec8e676da408a79e

Thanks.

Luca Boccassi

---
>From 8e419ba40ca20a9d1df5256eec8e676da408a79e Mon Sep 17 00:00:00 2001
From: Steve Yang <stevex.yang at intel.com>
Date: Mon, 18 Jan 2021 07:04:11 +0000
Subject: [PATCH] net/e1000: fix jumbo frame flag condition for MTU set

[ upstream commit b6c4c94175e8a72b3de9781bff3453a143cd868f ]

The jumbo frame uses the 'RTE_ETHER_MAX_LEN' as boundary condition,
but 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 change the boundary condition with 'RTE_ETHER_MTU' and
overhead, that perhaps impacts the cases of the jumbo frame related.

Fixes: ef990fb56e55 ("net/e1000: convert to new Rx offloads API")

Signed-off-by: Steve Yang <stevex.yang at intel.com>
Acked-by: Jeff Guo <jia.guo at intel.com>
---
 drivers/net/e1000/e1000_ethdev.h | 2 +-
 drivers/net/e1000/em_ethdev.c    | 5 ++---
 drivers/net/e1000/igb_ethdev.c   | 2 +-
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/net/e1000/e1000_ethdev.h b/drivers/net/e1000/e1000_ethdev.h
index 4755a5f333..3b4d9c3ee6 100644
--- a/drivers/net/e1000/e1000_ethdev.h
+++ b/drivers/net/e1000/e1000_ethdev.h
@@ -97,7 +97,7 @@
  */
 #define E1000_ETH_OVERHEAD (RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN + \
 				VLAN_TAG_SIZE)
-
+#define E1000_ETH_MAX_LEN (RTE_ETHER_MTU + E1000_ETH_OVERHEAD)
 /*
  * Maximum number of Ring Descriptors.
  *
diff --git a/drivers/net/e1000/em_ethdev.c b/drivers/net/e1000/em_ethdev.c
index 8ee9422bf4..2036c6e917 100644
--- a/drivers/net/e1000/em_ethdev.c
+++ b/drivers/net/e1000/em_ethdev.c
@@ -1799,8 +1799,7 @@ eth_em_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 	if (ret != 0)
 		return ret;
 
-	frame_size = mtu + RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN +
-		VLAN_TAG_SIZE;
+	frame_size = mtu + E1000_ETH_OVERHEAD;
 
 	/* check that mtu is within the allowed range */
 	if (mtu < RTE_ETHER_MIN_MTU || frame_size > dev_info.max_rx_pktlen)
@@ -1816,7 +1815,7 @@ eth_em_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 	rctl = E1000_READ_REG(hw, E1000_RCTL);
 
 	/* switch to jumbo mode if needed */
-	if (frame_size > RTE_ETHER_MAX_LEN) {
+	if (frame_size > E1000_ETH_MAX_LEN) {
 		dev->data->dev_conf.rxmode.offloads |=
 			DEV_RX_OFFLOAD_JUMBO_FRAME;
 		rctl |= E1000_RCTL_LPE;
diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
index 647aa8d995..dfe87508c2 100644
--- a/drivers/net/e1000/igb_ethdev.c
+++ b/drivers/net/e1000/igb_ethdev.c
@@ -4369,7 +4369,7 @@ eth_igb_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 	rctl = E1000_READ_REG(hw, E1000_RCTL);
 
 	/* switch to jumbo mode if needed */
-	if (frame_size > RTE_ETHER_MAX_LEN) {
+	if (frame_size > E1000_ETH_MAX_LEN) {
 		dev->data->dev_conf.rxmode.offloads |=
 			DEV_RX_OFFLOAD_JUMBO_FRAME;
 		rctl |= E1000_RCTL_LPE;
-- 
2.29.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-02-05 11:18:35.890453090 +0000
+++ 0147-net-e1000-fix-jumbo-frame-flag-condition-for-MTU-set.patch	2021-02-05 11:18:29.054695833 +0000
@@ -1 +1 @@
-From b6c4c94175e8a72b3de9781bff3453a143cd868f Mon Sep 17 00:00:00 2001
+From 8e419ba40ca20a9d1df5256eec8e676da408a79e Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit b6c4c94175e8a72b3de9781bff3453a143cd868f ]
+
@@ -15 +16,0 @@
-Cc: stable at dpdk.org