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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
..
asm-generic unify {de,}mangle_poll(), get rid of kernel-side POLL... 2018-02-11 14:37:22 -08:00
drm drm/tegra: Changes for v4.16-rc1 2018-01-12 11:46:19 +10:00
linux rds: zerocopy Tx support. 2018-02-16 16:04:17 -05:00
misc ocxl: Add AFU interrupt support 2018-01-24 11:42:58 +11:00
mtd License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
rdma RDMA/netlink: Hide unimplemented NLDEV commands 2018-01-31 16:30:04 -05:00
scsi License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
sound Merge remote-tracking branches 'asoc/topic/fsl', 'asoc/topic/fsl-ssi', 'asoc/topic/fsl_asrc' and 'asoc/topic/hdac_hdmi' into asoc-next 2018-01-18 11:55:56 +00:00
video License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
xen License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00