linux/arch/xtensa
Arnaldo Carvalho de Melo a2e2725541 net: Introduce recvmmsg socket syscall
Meaning receive multiple messages, reducing the number of syscalls and
net stack entry/exit operations.

Next patches will introduce mechanisms where protocols that want to
optimize this operation will provide an unlocked_recvmsg operation.

This takes into account comments made by:

. Paul Moore: sock_recvmsg is called only for the first datagram,
  sock_recvmsg_nosec is used for the rest.

. Caitlin Bestler: recvmmsg now has a struct timespec timeout, that
  works in the same fashion as the ppoll one.

  If the underlying protocol returns a datagram with MSG_OOB set, this
  will make recvmmsg return right away with as many datagrams (+ the OOB
  one) it has received so far.

. Rémi Denis-Courmont & Steven Whitehouse: If we receive N < vlen
  datagrams and then recvmsg returns an error, recvmmsg will return
  the successfully received datagrams, store the error and return it
  in the next call.

This paves the way for a subsequent optimization, sk_prot->unlocked_recvmsg,
where we will be able to acquire the lock only at batch start and end, not at
every underlying recvmsg call.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-10-12 23:40:10 -07:00
..
boot xtensa: move headers files to arch/xtensa/include 2008-11-06 10:25:09 -08:00
configs xtensa: enable m41t80 driver in s6105_defconfig 2009-06-22 02:38:11 -07:00
include/asm net: Introduce recvmmsg socket syscall 2009-10-12 23:40:10 -07:00
kernel xtensa: Cleanup linker script using new linker script macros. 2009-09-24 17:16:21 -07:00
lib xtensa: move headers files to arch/xtensa/include 2008-11-06 10:25:09 -08:00
mm arches: drop superfluous casts in nr_free_pages() callers 2009-09-22 07:17:34 -07:00
platforms net: convert remaining non-symbolic return values in ndo_start_xmit() functions 2009-07-05 19:23:38 -07:00
variants xtensa: support s6000 gpio irqs and alternate function selection 2009-06-22 02:37:26 -07:00
Kconfig xtensa: implement ccount calibration for s6000 2009-05-11 22:00:17 -07:00
Kconfig.debug [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 1 2005-06-24 00:05:21 -07:00
Makefile xtensa: only build platform or variant if they contain a Makefile 2009-04-03 00:06:45 -07:00