netdev - RE: [EXTERNAL] [PATCH v2] netvsc: transfer lower device max tso size

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Message-ID:
 <DS2PR21MB518165AC2EFCCCB436DD1B23CE5EA@DS2PR21MB5181.namprd21.prod.outlook.com>
Date: Thu, 24 Jul 2025 18:11:52 +0000
From: Long Li <longli@...rosoft.com>
To: Cindy Lu <lulu@...hat.com>, KY Srinivasan <kys@...rosoft.com>, Haiyang
 Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, Dexuan Cui
	<decui@...rosoft.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Simon Horman
	<horms@...nel.org>, Michael Kelley <mhklinux@...look.com>, Shradha Gupta
	<shradhagupta@...ux.microsoft.com>, Kees Cook <kees@...nel.org>, Saurabh
 Sengar <ssengar@...ux.microsoft.com>, Stanislav Fomichev <sdf@...ichev.me>,
	Kuniyuki Iwashima <kuniyu@...gle.com>, Alexander Lobakin
	<aleksander.lobakin@...el.com>, Guillaume Nault <gnault@...hat.com>, Joe
 Damato <jdamato@...tly.com>, Ahmed Zaki <ahmed.zaki@...el.com>, "open
 list:Hyper-V/Azure CORE AND DRIVERS" <linux-hyperv@...r.kernel.org>, "open
 list:NETWORKING DRIVERS" <netdev@...r.kernel.org>, open list
	<linux-kernel@...r.kernel.org>, "jasowang@...hat.com" <jasowang@...hat.com>
Subject: RE: [EXTERNAL] [PATCH v2] netvsc: transfer lower device max tso size



> -----Original Message-----
> From: Cindy Lu <lulu@...hat.com>
> Sent: Friday, July 18, 2025 1:29 AM
> To: KY Srinivasan <kys@...rosoft.com>; Haiyang Zhang
> <haiyangz@...rosoft.com>; Wei Liu <wei.liu@...nel.org>; Dexuan Cui
> <decui@...rosoft.com>; Andrew Lunn <andrew+netdev@...n.ch>; David S.
> Miller <davem@...emloft.net>; Eric Dumazet <edumazet@...gle.com>; Jakub
> Kicinski <kuba@...nel.org>; Paolo Abeni <pabeni@...hat.com>; Simon Horman
> <horms@...nel.org>; Michael Kelley <mhklinux@...look.com>; Shradha Gupta
> <shradhagupta@...ux.microsoft.com>; Kees Cook <kees@...nel.org>; Saurabh
> Sengar <ssengar@...ux.microsoft.com>; Stanislav Fomichev <sdf@...ichev.me>;
> Kuniyuki Iwashima <kuniyu@...gle.com>; Alexander Lobakin
> <aleksander.lobakin@...el.com>; Guillaume Nault <gnault@...hat.com>; Joe
> Damato <jdamato@...tly.com>; Ahmed Zaki <ahmed.zaki@...el.com>; open
> list:Hyper-V/Azure CORE AND DRIVERS <linux-hyperv@...r.kernel.org>; open
> list:NETWORKING DRIVERS <netdev@...r.kernel.org>; open list <linux-
> kernel@...r.kernel.org>; lulu@...hat.com; jasowang@...hat.com
> Subject: [EXTERNAL] [PATCH v2] netvsc: transfer lower device max tso size
> 
> From: Jason Wang <jasowang@...hat.com>
> 
> When netvsc is accelerated by the lower device, we can advertise the lower
> device max tso size in order to get better performance.
> 
> One example is that when 802.3ad encap is enabled by netvsc, it has a lower max
> tso size than 64K. This will lead to software segmentation of forwarding GSO
> packet (e.g the one from VM/tap).
> 
> This patch help to recover the performance.
> 
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> Tested-by: Cindy Lu <lulu@...hat.com>
> Signed-off-by: Cindy Lu <lulu@...hat.com>

Reviewed-by: Long Li <longli@...rosoft.com>