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

Eric Biggers
2025-05-11T00:41:28Z

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.

I'm proposing that this series be taken through net-next for 6.16, but
patch 9 could use an ack from the NVME maintainers.

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 | 118 +++++++++-----------------
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 | 34 ++++----
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, 156 insertions(+), 274 deletions(-)

base-commit: 0b28182c73a3d013bcabbb890dc1070a8388f55a
--
2.49.0