netdev - RE: [PATCH v3 net-next 0/3] net: batched receive in GRO path

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Message-ID: <AM0PR04MB4994C1A8F32FB6C9A7EE057E94D60@AM0PR04MB4994.eurprd04.prod.outlook.com>
Date:   Fri, 9 Aug 2019 17:14:50 +0000
From:   Ioana Ciocoi Radulescu <ruxandra.radulescu@....com>
To:     Edward Cree <ecree@...arflare.com>,
        David Miller <davem@...emloft.net>
CC:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        "linux-net-drivers@...arflare.com" <linux-net-drivers@...arflare.com>
Subject: RE: [PATCH v3 net-next 0/3] net: batched receive in GRO path

> -----Original Message-----
> From: netdev-owner@...r.kernel.org <netdev-owner@...r.kernel.org> On
> Behalf Of Edward Cree
> Sent: Tuesday, August 6, 2019 4:52 PM
> To: David Miller <davem@...emloft.net>
> Cc: netdev <netdev@...r.kernel.org>; Eric Dumazet
> <eric.dumazet@...il.com>; linux-net-drivers@...arflare.com
> Subject: [PATCH v3 net-next 0/3] net: batched receive in GRO path
> 
> This series listifies part of GRO processing, in a manner which allows those
>  packets which are not GROed (i.e. for which dev_gro_receive returns
>  GRO_NORMAL) to be passed on to the listified regular receive path.
> dev_gro_receive() itself is not listified, nor the per-protocol GRO
>  callback, since GRO's need to hold packets on lists under napi->gro_hash
>  makes keeping the packets on other lists awkward, and since the GRO control
>  block state of held skbs can refer only to one 'new' skb at a time.
> Instead, when napi_frags_finish() handles a GRO_NORMAL result, stash the skb
>  onto a list in the napi struct, which is received at the end of the napi
>  poll or when its length exceeds the (new) sysctl net.core.gro_normal_batch.

Hi Edward,

I'm probably missing a lot of context here, but is there a reason
this change targets only the napi_gro_frags() path and not the
napi_gro_receive() one?

I'm trying to understand what drivers that don't call napi_gro_frags()
should do in order to benefit from this batching feature.

Thanks,
Ioana