linux-kernel - [PATCH RFC net-next 00/20] net: dsa: add GRO support

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Date:   Mon, 30 Dec 2019 17:30:08 +0300
From:   Alexander Lobakin <alobakin@...nk.ru>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     Edward Cree <ecree@...arflare.com>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Sean Wang <sean.wang@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Alexander Lobakin <alobakin@...nk.ru>,
        Taehee Yoo <ap420073@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Song Liu <songliubraving@...com>,
        Matteo Croce <mcroce@...hat.com>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Paul Blakey <paulb@...lanox.com>,
        Yoshiki Komachi <komachi.yoshiki@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH RFC net-next 00/20] net: dsa: add GRO support

As of now, napi_gro_receive() in cases where the corresponding
device is installed as CPU port of DSA-driven switch is in fact
an overheaded version of netif_receive_skb{,_list}() with no
advantages over:

- dev_gro_receive() can't find packet_offload for ETH_P_XDSA type;
- so it immediately returns GRO_NORMAL;
- napi_skb_finish() passes skb to gro_normal_one() -> netstack.

This series adds a basic infrastructure to allow DSA taggers to
implement GRO callbacks and adds GRO support for 5 tagger drivers:
* tag_ar9331
* tag_gswip
* tag_lan9303
* tag_mtk
* tag_qca

I didn't make it for the rest because they are in fact way more
complicated (e.g. combined DSA + 802.1q tag etc.) and require
more familiarity with them and tests on the real hardware, which
is inaccesible for me at the moment.

This series also includes a bunch of random fixes in several tagger
drivers and some cleanup. I left them all in one place as they depend
on each other, but there's no problem for me to split this into
different series.

I mark this as RFC, and there are the key questions for maintainers,
developers, users etc.:
- Do we need GRO support for DSA at all?
- Which tagger protocols really need it and which don't?
- Are the actual changes correct in every single tagger code?
- Does this series bring any performance improvements on the
  affected systems?
- Would anybody mind if we'd add DSA support to napi_gro_frags()?
- Any code/other comments/notes.

I also would like to see more taggers with GRO callbacks, such as
DSA and EDSA, and the results of their addition.

Alexander Lobakin (20):
  net: dsa: make .flow_dissect() callback returning void
  net: dsa: add GRO support infrastructure
  net: dsa: tag_ar9331: add .flow_dissect() callback
  net: dsa: tag_ar9331: split out common tag accessors
  net: dsa: tag_ar9331: add GRO callbacks
  net: dsa: tag_gswip: fix typo in tag name
  net: dsa: tag_gswip: switch to bitfield helpers
  net: dsa: tag_gswip: add .flow_dissect() callback
  net: dsa: tag_gswip: split out common tag accessors
  net: dsa: tag_gswip: add GRO callbacks
  net: dsa: tag_lan9303: add .flow_dissect() callback
  net: dsa: tag_lan9303: split out common tag accessors
  net: dsa: tag_lan9303: add GRO callbacks
  net: dsa: tag_mtk: split out common tag accessors
  net: dsa: tag_mtk: add GRO callbacks
  net: dsa: tag_qca: fix doubled Tx statistics
  net: dsa: tag_qca: switch to bitfield helpers
  net: dsa: tag_qca: split out common tag accessors
  net: dsa: tag_qca: add GRO callbacks
  net: core: add (unlikely) DSA support in napi_gro_frags()

 include/net/dsa.h         |  10 ++-
 net/core/dev.c            |  11 ++-
 net/core/flow_dissector.c |   8 +-
 net/dsa/dsa.c             |  43 +++++++++-
 net/dsa/dsa2.c            |   1 +
 net/dsa/tag_ar9331.c      | 139 ++++++++++++++++++++++++++-----
 net/dsa/tag_dsa.c         |   5 +-
 net/dsa/tag_edsa.c        |   5 +-
 net/dsa/tag_gswip.c       | 126 +++++++++++++++++++++++-----
 net/dsa/tag_lan9303.c     | 139 ++++++++++++++++++++++++++-----
 net/dsa/tag_mtk.c         | 115 +++++++++++++++++++++-----
 net/dsa/tag_qca.c         | 167 ++++++++++++++++++++++++++++----------
 12 files changed, 629 insertions(+), 140 deletions(-)

-- 
2.24.1