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

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Date:   Sat, 17 Mar 2018 20:05:13 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     doshir@...are.com
Cc:     netdev@...r.kernel.org, rachel_lunnon@...rmagic.com,
        skhare@...are.com, pv-drivers@...are.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net 2/2] vmxnet3: use correct flag to indicate LRO
 feature

From: Ronak Doshi <doshir@...are.com>
Date: Fri, 16 Mar 2018 14:49:19 -0700

> '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>

Applied.