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Message-Id: <20191230143028.27313-1-alobakin@dlink.ru>
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
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