netdev - RE: [PATCH net-next v4 4/5] bnx2x: Use NETIF_F_GRO

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Date:   Fri, 15 Dec 2017 07:07:48 +0000
From:   "Chopra, Manish" <Manish.Chopra@...ium.com>
To:     Michael Chan <michael.chan@...adcom.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "andrew.gospodarek@...adcom.com" <andrew.gospodarek@...adcom.com>,
        "Elior, Ariel" <Ariel.Elior@...ium.com>,
        Dept-Eng Everest Linux L2 <Dept-EngEverestLinuxL2@...ium.com>
Subject: RE: [PATCH net-next v4 4/5] bnx2x: Use NETIF_F_GRO_HW.

> -----Original Message-----
> From: Michael Chan [mailto:michael.chan@...adcom.com]
> Sent: Thursday, December 14, 2017 2:16 AM
> To: Chopra, Manish <Manish.Chopra@...ium.com>
> Cc: davem@...emloft.net; netdev@...r.kernel.org;
> andrew.gospodarek@...adcom.com; Elior, Ariel <Ariel.Elior@...ium.com>;
> Dept-Eng Everest Linux L2 <Dept-EngEverestLinuxL2@...ium.com>
> Subject: Re: [PATCH net-next v4 4/5] bnx2x: Use NETIF_F_GRO_HW.
> 
> On Wed, Dec 13, 2017 at 1:08 AM, Chopra, Manish
> <Manish.Chopra@...ium.com> wrote:
> >
> > Hi Michael,  There seems a behavioral change here. This driver support
> > two HW aggregation modes [LRO and GRO] With the changes, Interfaces
> come with HW GRO enabled and LRO disabled by default as opposed to earlier
> where interfaces used to come with LRO enabled.
> 
> Right.  Before, you had both NETIF_F_GRO and NETIF_F_LRO set and the code
> looked at NETIF_F_LRO first and turned on LRO.
> 
> Now, we set NETIF_F_GRO and NETIF_F_GRO_HW by default.  NETIF_F_LRO is
> turned off since NETIF_F_GRO_HW is on.
> 
> If you want, I can change it back to the old default.
> 
Michael, I checked it on again, I tried to set LRO in dev->features and dev->hw_features.
Somehow, it gets disabled after register_netdevice().  Any idea why ? Although, I am not running any Bridge/bonding devices.
Looks like, without this series also devices seems to have LRO disabled by default.
Not sure why register_netdevice() disables LRO even driver populates this feature prior to register_netdevice().