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Sowmini Varadhan 0cebaccef3 rds: zerocopy Tx support. 
If the MSG_ZEROCOPY flag is specified with rds_sendmsg(), and,
if the SO_ZEROCOPY socket option has been set on the PF_RDS socket,
application pages sent down with rds_sendmsg() are pinned.

The pinning uses the accounting infrastructure added by
Commit a91dbff551 ("sock: ulimit on MSG_ZEROCOPY pages")

The payload bytes in the message may not be modified for the
duration that the message has been pinned. A multi-threaded
application using this infrastructure may thus need to be notified
about send-completion so that it can free/reuse the buffers
passed to rds_sendmsg(). Notification of send-completion will
identify each message-buffer by a cookie that the application
must specify as ancillary data to rds_sendmsg().
The ancillary data in this case has cmsg_level == SOL_RDS
and cmsg_type == RDS_CMSG_ZCOPY_COOKIE.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16 16:04:17 -05:00
..
acpi ACPICA: Update version to 20180105 2018-02-06 10:32:13 +01:00
asm-generic RISC-V changes for 4.16 2018-02-07 11:33:08 -08:00
clocksource
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2018-01-31 14:22:45 -08:00
drm drm/graphics pull request for v4.16-rc1 2018-02-01 17:48:47 -08:00
dt-bindings net: phy: dp83867: Add binding for the CLK_OUT pin muxing option 2018-02-14 15:33:43 -05:00
keys
kvm KVM changes for 4.16 2018-02-10 13:16:35 -08:00
linux skbuff: export mm_[un]account_pinned_pages for other modules 2018-02-16 16:04:16 -05:00
math-emu
media vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
memory
misc powerpc updates for 4.16 2018-02-02 10:01:04 -08:00
net net: Revert sched action extack support series. 2018-02-16 16:03:39 -05:00
pcmcia
ras
rdma IB/core: Map iWarp AH type to undefined in rdma_ah_find_type 2018-02-01 15:43:31 -07:00
scsi SCSI postmerge on 20180202 2018-02-03 13:07:56 -08:00
soc ARM: SoC driver updates for 4.16 2018-02-01 16:35:31 -08:00
sound ASoC: Updates for v4.16 2018-02-07 12:11:09 -08:00
target
trace Char/Misc driver patches for 4.16-rc1 2018-02-01 10:31:17 -08:00
uapi rds: zerocopy Tx support. 2018-02-16 16:04:17 -05:00
video fbdev changes for v4.16: 2018-02-07 13:10:43 -08:00
xen