netdev - [PATCH v2 00/10] net: faster and simpler CRC32C computation

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Message-ID: <20250519175012.36581-1-ebiggers@kernel.org>
Date: Mon, 19 May 2025 10:50:02 -0700
From: Eric Biggers <ebiggers@...nel.org>
To: netdev@...r.kernel.org
Cc: linux-nvme@...ts.infradead.org,
	linux-sctp@...r.kernel.org,
	linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Daniel Borkmann <daniel@...earbox.net>,
	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
	Sagi Grimberg <sagi@...mberg.me>,
	Ard Biesheuvel <ardb@...nel.org>
Subject: [PATCH v2 00/10] net: faster and simpler CRC32C computation

Update networking code that computes the CRC32C of packets to just call
crc32c() without unnecessary abstraction layers.  The result is faster
and simpler code.

Patches 1-7 add skb_crc32c() and remove the overly-abstracted and
inefficient __skb_checksum().

Patches 8-10 replace skb_copy_and_hash_datagram_iter() with
skb_copy_and_crc32c_datagram_iter(), eliminating the unnecessary use of
the crypto layer.  This unblocks the conversion of nvme-tcp to call
crc32c() directly instead of using the crypto layer, which patch 9 does.

Please consider this series for net-next for 6.16.

Changed in v2:
  - Added some benchmarks to commit message of "net: add skb_crc32c()"
  - Added "Return:" to kerneldoc for skb_copy_and_crc32c_datagram_iter()
  - Added Reviewed-by's
  - Addressed review comments on nvme-tcp patch

Eric Biggers (10):
  net: introduce CONFIG_NET_CRC32C
  net: add skb_crc32c()
  net: use skb_crc32c() in skb_crc32c_csum_help()
  RDMA/siw: use skb_crc32c() instead of __skb_checksum()
  sctp: use skb_crc32c() instead of __skb_checksum()
  net: fold __skb_checksum() into skb_checksum()
  lib/crc32: remove unused support for CRC32C combination
  net: add skb_copy_and_crc32c_datagram_iter()
  nvme-tcp: use crc32c() and skb_copy_and_crc32c_datagram_iter()
  net: remove skb_copy_and_hash_datagram_iter()

 drivers/infiniband/sw/siw/Kconfig |   1 +
 drivers/infiniband/sw/siw/siw.h   |  22 +----
 drivers/nvme/host/Kconfig         |   4 +-
 drivers/nvme/host/tcp.c           | 124 +++++++++-------------------
 include/linux/crc32.h             |  23 ------
 include/linux/skbuff.h            |  16 +---
 include/net/checksum.h            |  12 ---
 include/net/sctp/checksum.h       |  29 +------
 lib/crc32.c                       |   6 --
 lib/tests/crc_kunit.c             |   6 --
 net/Kconfig                       |   4 +
 net/core/datagram.c               |  36 ++++----
 net/core/dev.c                    |  10 +--
 net/core/skbuff.c                 | 132 ++++++++++++++++++------------
 net/netfilter/Kconfig             |   4 +-
 net/netfilter/ipvs/Kconfig        |   2 +-
 net/openvswitch/Kconfig           |   2 +-
 net/sched/Kconfig                 |   2 +-
 net/sctp/Kconfig                  |   2 +-
 net/sctp/offload.c                |   1 -
 20 files changed, 161 insertions(+), 277 deletions(-)


base-commit: a8ae8a0e848e3506c95e45e7cb6e640502495f1a
-- 
2.49.0