linux-kernel - [PATCH v2 net 2/2] vmxnet3: use correct flag to indicate LRO feature

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Message-ID: <20180316214919.20716-1-doshir@vmware.com>
Date:   Fri, 16 Mar 2018 14:49:19 -0700
From:   Ronak Doshi <doshir@...are.com>
To:     <netdev@...r.kernel.org>
CC:     <rachel_lunnon@...rmagic.com>, Ronak Doshi <doshir@...are.com>,
        Shrikrishna Khare <skhare@...are.com>,
        "VMware, Inc." <pv-drivers@...are.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 net 2/2] vmxnet3: use correct flag to indicate LRO feature

'Commit 45dac1d6ea04 ("vmxnet3: Changes for vmxnet3 adapter version 2
(fwd)")' introduced a flag "lro" in structure vmxnet3_adapter which is
used to indicate whether LRO is enabled or not. However, the patch
did not set the flag and hence it was never exercised.

So, when LRO is enabled, it resulted in poor TCP performance due to
delayed acks. This issue is seen with packets which are larger than
the mss getting a delayed ack rather than an immediate ack, thus
resulting in high latency.

This patch removes the lro flag and directly uses device features
against NETIF_F_LRO to check if lro is enabled.

Fixes: 45dac1d6ea04 ("vmxnet3: Changes for vmxnet3 adapter version 2 (fwd)")
Reported-by: Rachel Lunnon <rachel_lunnon@...rmagic.com>
Signed-off-by: Ronak Doshi <doshir@...are.com>
Acked-by: Shrikrishna Khare <skhare@...are.com>
---
Changes in v2:
 - Added "Fixes:" tag for the commit which introduced this issue

 drivers/net/vmxnet3/vmxnet3_drv.c | 3 ++-
 drivers/net/vmxnet3/vmxnet3_int.h | 5 ++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c
index b466a422b72d..e04937f44f33 100644
--- a/drivers/net/vmxnet3/vmxnet3_drv.c
+++ b/drivers/net/vmxnet3/vmxnet3_drv.c
@@ -1473,7 +1473,8 @@ vmxnet3_rq_rx_complete(struct vmxnet3_rx_queue *rq,
 			vmxnet3_rx_csum(adapter, skb,
 					(union Vmxnet3_GenericDesc *)rcd);
 			skb->protocol = eth_type_trans(skb, adapter->netdev);
-			if (!rcd->tcp || !adapter->lro)
+			if (!rcd->tcp ||
+			    !(adapter->netdev->features & NETIF_F_LRO))
 				goto not_lro;
 
 			if (segCnt != 0 && mss != 0) {
diff --git a/drivers/net/vmxnet3/vmxnet3_int.h b/drivers/net/vmxnet3/vmxnet3_int.h
index b94fdfd0b6f1..99387a4a20a8 100644
--- a/drivers/net/vmxnet3/vmxnet3_int.h
+++ b/drivers/net/vmxnet3/vmxnet3_int.h
@@ -69,10 +69,10 @@
 /*
  * Version numbers
  */
-#define VMXNET3_DRIVER_VERSION_STRING   "1.4.12.0-k"
+#define VMXNET3_DRIVER_VERSION_STRING   "1.4.13.0-k"
 
 /* a 32-bit int, each byte encode a verion number in VMXNET3_DRIVER_VERSION */
-#define VMXNET3_DRIVER_VERSION_NUM      0x01040c00
+#define VMXNET3_DRIVER_VERSION_NUM      0x01040d00
 
 #if defined(CONFIG_PCI_MSI)
 	/* RSS only makes sense if MSI-X is supported. */
@@ -343,7 +343,6 @@ struct vmxnet3_adapter {
 	u8                              version;
 
 	bool				rxcsum;
-	bool				lro;
 
 #ifdef VMXNET3_RSS
 	struct UPT1_RSSConf		*rss_conf;
-- 
2.11.0