[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <20230423144948.650717-1-shayagr@amazon.com>
Date: Sun, 23 Apr 2023 17:49:46 +0300
From: Shay Agroskin <shayagr@...zon.com>
To: Michal Kubecek <mkubecek@...e.cz>,
David Miller <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, <netdev@...r.kernel.org>
CC: Shay Agroskin <shayagr@...zon.com>,
"Woodhouse, David" <dwmw@...zon.com>,
"Machulsky, Zorik" <zorik@...zon.com>,
"Matushevsky, Alexander" <matua@...zon.com>,
Saeed Bshara <saeedb@...zon.com>,
"Wilson, Matt" <msw@...zon.com>,
"Liguori, Anthony" <aliguori@...zon.com>,
"Bshara, Nafea" <nafea@...zon.com>,
"Belgazal, Netanel" <netanel@...zon.com>,
"Saidi, Ali" <alisaidi@...zon.com>,
"Herrenschmidt, Benjamin" <benh@...zon.com>,
"Kiyanovski, Arthur" <akiyano@...zon.com>,
"Dagan, Noam" <ndagan@...zon.com>,
"Arinzon, David" <darinzon@...zon.com>,
"Itzko, Shahar" <itzko@...zon.com>,
"Abboud, Osama" <osamaabb@...zon.com>,
Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>,
Vladimir Oltean <vladimir.oltean@....com>,
Andrew Lunn <andrew@...n.ch>,
Johannes Berg <johannes@...solutions.net>,
Edward Cree <ecree.xilinx@...il.com>,
Florian Westphal <fw@...len.de>
Subject: [PATCH v2 ethtool-next 0/2] Add tx push buf len param to ethtool
This patchset adds a new sub-configuration to ethtool get/set queue
params (ethtool -g) called 'tx-push-buf-len'.
This configuration specifies the maximum number of bytes of a
transmitted packet a driver can push directly to the underlying
device ('push' mode). The motivation for pushing some of the bytes to
the device has the advantages of
- Allowing a smart device to take fast actions based on the packet's
header
- Reducing latency for small packets that can be copied completely into
the device
This new param is practically similar to tx-copybreak value that can be
set using ethtool's tunable but conceptually serves a different purpose.
While tx-copybreak is used to reduce the overhead of DMA mapping and
makes no sense to use if less than the whole segment gets copied,
tx-push-buf-len allows to improve performance by analyzing the packet's
data (usually headers) before performing the DMA operation.
The configuration can be queried and set using the commands:
$ ethtool -g [interface]
# ethtool -G [interface] tx-push-buf-len [number of bytes]
Shay Agroskin (2):
update UAPI header copies
ethtool: Add support for configuring tx-push-buf-len
ethtool.8.in | 5 +++++
ethtool.c | 1 +
netlink/desc-ethtool.c | 2 ++
netlink/rings.c | 38 +++++++++++++++++++++++-------------
uapi/linux/ethtool_netlink.h | 2 ++
uapi/linux/rtnetlink.h | 1 +
6 files changed, 35 insertions(+), 14 deletions(-)
--
2.25.1
Powered by blists - more mailing lists