[net-next,v4,00/15] splice, net: Switch over users of sendpage() and remove it

  Here's the final set of patches towards the removal of sendpage.  All the
drivers that use sendpage() get switched over to using sendmsg() with
MSG_SPLICE_PAGES.

The following changes are made:

 (1) Make the protocol drivers behave according to MSG_MORE, not
     MSG_SENDPAGE_NOTLAST.  The latter is restricted to turning on MSG_MORE
     in the sendpage() wrappers.

 (2) Fix ocfs2 to allocate its global protocol buffers with folio_alloc()
     rather than kzalloc() so as not to invoke the !sendpage_ok warning in
     skb_splice_from_iter().

 (3) Make ceph/rds, skb_send_sock, dlm, nvme, smc, ocfs2, drbd and iscsi
     use sendmsg(), not sendpage and make them specify MSG_MORE instead of
     MSG_SENDPAGE_NOTLAST.

 (4) Kill off sendpage and clean up MSG_SENDPAGE_NOTLAST.

I've pushed the patches here also:

	https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=sendpage-3-killsb

David

Changes
=======
ver #4)
 - Drop the copy-slab-to-fragment code from skb_splice_from_iter().
 - Slim down the driver changes to only do one page at a time.
 - Drop the siw and drbd page aggregation single-sendmsg patches.
 - Make nvme/host cancel MSG_SPLICE_PAGES if !sendpage_ok.
 - Break out the ocfs2 protocol buffer allocation fix into its own patch.
 - Simplify the ocfs2 protocol data transmission.

ver #3)
 - Remove duplicate decl of skb_splice_from_iter().
 - In tcp_bpf, reset msg_flags on each iteration to clear MSG_MORE.
 - In tcp_bpf, set MSG_MORE if there's more data in the sk_msg.
 - Split the nvme patch into host and target patches.

ver #2)
 - Wrapped some lines at 80.
 - Fixed parameter to put_cpu_ptr() to have an '&'.
 - Use "unsigned int" rather than "unsigned".
 - Removed duplicate word in comment.
 - Filled in the commit message on the last patch.

Link: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=51c78a4d532efe9543a4df019ff405f05c6157f6 # part 1
Link: https://lore.kernel.org/r/20230616161301.622169-1-dhowells@redhat.com/ # v1
Link: https://lore.kernel.org/r/20230617121146.716077-1-dhowells@redhat.com/ # v2
Link: https://lore.kernel.org/r/20230620145338.1300897-1-dhowells@redhat.com/ # v3





David Howells (15):
  tcp_bpf, smc, tls, espintcp, siw: Reduce MSG_SENDPAGE_NOTLAST usage
  net: Use sendmsg(MSG_SPLICE_PAGES) not sendpage in skb_send_sock()
  ceph: Use sendmsg(MSG_SPLICE_PAGES) rather than sendpage
  ceph: Use sendmsg(MSG_SPLICE_PAGES) rather than sendpage()
  rds: Use sendmsg(MSG_SPLICE_PAGES) rather than sendpage
  dlm: Use sendmsg(MSG_SPLICE_PAGES) rather than sendpage
  nvme-tcp: Use sendmsg(MSG_SPLICE_PAGES) rather then sendpage
  nvmet-tcp: Use sendmsg(MSG_SPLICE_PAGES) rather then sendpage
  smc: Drop smc_sendpage() in favour of smc_sendmsg() + MSG_SPLICE_PAGES
  drbd: Use sendmsg(MSG_SPLICE_PAGES) rather than sendpage()
  iscsi: Use sendmsg(MSG_SPLICE_PAGES) rather than sendpage
  ocfs2: Fix use of slab data with sendpage
  ocfs2: Use sendmsg(MSG_SPLICE_PAGES) rather than sendpage()
  sock: Remove ->sendpage*() in favour of sendmsg(MSG_SPLICE_PAGES)
  net: Kill MSG_SENDPAGE_NOTLAST

 Documentation/bpf/map_sockmap.rst             | 10 +-
 Documentation/filesystems/locking.rst         |  2 -
 Documentation/filesystems/vfs.rst             |  1 -
 Documentation/networking/scaling.rst          |  4 +-
 crypto/af_alg.c                               | 28 ------
 crypto/algif_aead.c                           | 22 +----
 crypto/algif_rng.c                            |  2 -
 crypto/algif_skcipher.c                       | 14 ---
 drivers/block/drbd/drbd_main.c                | 12 ++-
 drivers/infiniband/sw/siw/siw_qp_tx.c         |  5 +-
 .../chelsio/inline_crypto/chtls/chtls.h       |  2 -
 .../chelsio/inline_crypto/chtls/chtls_io.c    | 14 ---
 .../chelsio/inline_crypto/chtls/chtls_main.c  |  1 -
 drivers/nvme/host/tcp.c                       | 49 +++++-----
 drivers/nvme/target/tcp.c                     | 46 ++++++----
 drivers/scsi/iscsi_tcp.c                      | 26 ++----
 drivers/scsi/iscsi_tcp.h                      |  2 -
 drivers/target/iscsi/iscsi_target_util.c      | 15 +--
 fs/dlm/lowcomms.c                             | 10 +-
 fs/nfsd/vfs.c                                 |  2 +-
 fs/ocfs2/cluster/tcp.c                        | 38 ++++----
 include/crypto/if_alg.h                       |  2 -
 include/linux/net.h                           |  8 --
 include/linux/socket.h                        |  4 +-
 include/net/inet_common.h                     |  2 -
 include/net/sock.h                            |  6 --
 include/net/tcp.h                             |  4 -
 net/appletalk/ddp.c                           |  1 -
 net/atm/pvc.c                                 |  1 -
 net/atm/svc.c                                 |  1 -
 net/ax25/af_ax25.c                            |  1 -
 net/caif/caif_socket.c                        |  2 -
 net/can/bcm.c                                 |  1 -
 net/can/isotp.c                               |  1 -
 net/can/j1939/socket.c                        |  1 -
 net/can/raw.c                                 |  1 -
 net/ceph/messenger_v1.c                       | 58 ++++--------
 net/ceph/messenger_v2.c                       | 91 ++++---------------
 net/core/skbuff.c                             | 50 +++++-----
 net/core/sock.c                               | 35 +------
 net/dccp/ipv4.c                               |  1 -
 net/dccp/ipv6.c                               |  1 -
 net/ieee802154/socket.c                       |  2 -
 net/ipv4/af_inet.c                            | 21 -----
 net/ipv4/tcp.c                                | 43 +--------
 net/ipv4/tcp_bpf.c                            | 28 +-----
 net/ipv4/tcp_ipv4.c                           |  1 -
 net/ipv4/udp.c                                | 15 ---
 net/ipv4/udp_impl.h                           |  2 -
 net/ipv4/udplite.c                            |  1 -
 net/ipv6/af_inet6.c                           |  3 -
 net/ipv6/raw.c                                |  1 -
 net/ipv6/tcp_ipv6.c                           |  1 -
 net/kcm/kcmsock.c                             | 20 ----
 net/key/af_key.c                              |  1 -
 net/l2tp/l2tp_ip.c                            |  1 -
 net/l2tp/l2tp_ip6.c                           |  1 -
 net/llc/af_llc.c                              |  1 -
 net/mctp/af_mctp.c                            |  1 -
 net/mptcp/protocol.c                          |  2 -
 net/netlink/af_netlink.c                      |  1 -
 net/netrom/af_netrom.c                        |  1 -
 net/packet/af_packet.c                        |  2 -
 net/phonet/socket.c                           |  2 -
 net/qrtr/af_qrtr.c                            |  1 -
 net/rds/af_rds.c                              |  1 -
 net/rds/tcp_send.c                            | 23 ++---
 net/rose/af_rose.c                            |  1 -
 net/rxrpc/af_rxrpc.c                          |  1 -
 net/sctp/protocol.c                           |  1 -
 net/smc/af_smc.c                              | 29 ------
 net/smc/smc_stats.c                           |  2 +-
 net/smc/smc_stats.h                           |  1 -
 net/smc/smc_tx.c                              | 19 +---
 net/smc/smc_tx.h                              |  2 -
 net/socket.c                                  | 48 ----------
 net/tipc/socket.c                             |  3 -
 net/tls/tls.h                                 |  6 --
 net/tls/tls_device.c                          | 24 +----
 net/tls/tls_main.c                            |  9 +-
 net/tls/tls_sw.c                              | 37 +-------
 net/unix/af_unix.c                            | 19 ----
 net/vmw_vsock/af_vsock.c                      |  3 -
 net/x25/af_x25.c                              |  1 -
 net/xdp/xsk.c                                 |  1 -
 net/xfrm/espintcp.c                           | 10 +-
 .../perf/trace/beauty/include/linux/socket.h  |  1 -
 tools/perf/trace/beauty/msg_flags.c           |  5 +-
 88 files changed, 229 insertions(+), 747 deletions(-)