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