linux-kernel - [PATCH net-next 0/2] net: core: use listified Rx for GRO_NORMAL in napi_gro

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Date:   Thu, 10 Oct 2019 17:42:24 +0300
From:   Alexander Lobakin <alobakin@...nk.ru>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     Edward Cree <ecree@...arflare.com>, Jiri Pirko <jiri@...lanox.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Ido Schimmel <idosch@...lanox.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Petr Machata <petrm@...lanox.com>,
        Sabrina Dubroca <sd@...asysnail.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexander Lobakin <alobakin@...nk.ru>
Subject: [PATCH net-next 0/2] net: core: use listified Rx for GRO_NORMAL in napi_gro_receive()

Hi Dave,

This series was written as a continuation to commit 323ebb61e32b
("net: use listified RX for handling GRO_NORMAL skbs"), and also takes
an advantage of listified Rx for GRO. This time, however, we're
targeting at a way more common and used function, napi_gro_receive().

There are about ~100 call sites of this function, including gro_cells
and mac80211, so even wireless systems will benefit from it.
The only driver that cares about the return value is
ethernet/socionext/netsec, and only for updating statistics. I don't
believe that this change can break its functionality, but anyway,
we have plenty of time till next merge window to pay this change
a proper attention.

Besides having this functionality implemented for napi_gro_frags()
users, the main reason is the solid performance boost that has been
shown during tests on 1-core MIPS board (with not yet mainlined
driver):

* no batching (5.4-rc2): ~450/450 Mbit/s
* with gro_normal_batch == 8: ~480/480 Mbit/s
* with gro_normal_batch == 16: ~500/500 Mbit/s

Applies on top of net-next.
Thanks.

Alexander Lobakin (2):
  net: core: use listified Rx for GRO_NORMAL in napi_gro_receive()
  net: core: increase the default size of GRO_NORMAL skb lists to flush

 net/core/dev.c | 51 +++++++++++++++++++++++++-------------------------
 1 file changed, 26 insertions(+), 25 deletions(-)

-- 
2.23.0