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authorArnaldo Carvalho de Melo <acme@redhat.com>2009-10-12 23:40:10 -0700
committerDavid S. Miller <davem@davemloft.net>2009-10-12 23:40:10 -0700
commita2e2725541fad72416326798c2d7fa4dafb7d337 (patch)
tree6174be11da607e83eb8efb3775114ad4d6e0ca3a /arch/mips
parentc05e85a06e376f6b6d59e71e5333d707e956d78b (diff)
downloadlinux-a2e2725541fad72416326798c2d7fa4dafb7d337.tar.bz2
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. . RĂ©mi 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>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/kernel/scall32-o32.S1
-rw-r--r--arch/mips/kernel/scall64-64.S1
-rw-r--r--arch/mips/kernel/scall64-n32.S1
-rw-r--r--arch/mips/kernel/scall64-o32.S1
4 files changed, 4 insertions, 0 deletions
diff --git a/arch/mips/kernel/scall32-o32.S b/arch/mips/kernel/scall32-o32.S
index fd2a9bb620d6..17202bbe843f 100644
--- a/arch/mips/kernel/scall32-o32.S
+++ b/arch/mips/kernel/scall32-o32.S
@@ -583,6 +583,7 @@ einval: li v0, -ENOSYS
sys sys_rt_tgsigqueueinfo 4
sys sys_perf_event_open 5
sys sys_accept4 4
+ sys sys_recvmmsg 5
.endm
/* We pre-compute the number of _instruction_ bytes needed to
diff --git a/arch/mips/kernel/scall64-64.S b/arch/mips/kernel/scall64-64.S
index 18bf7f32c5e4..a8a6c596eb04 100644
--- a/arch/mips/kernel/scall64-64.S
+++ b/arch/mips/kernel/scall64-64.S
@@ -420,4 +420,5 @@ sys_call_table:
PTR sys_rt_tgsigqueueinfo
PTR sys_perf_event_open
PTR sys_accept4
+ PTR sys_recvmmsg
.size sys_call_table,.-sys_call_table
diff --git a/arch/mips/kernel/scall64-n32.S b/arch/mips/kernel/scall64-n32.S
index 6ebc07976694..5154e64f7cfe 100644
--- a/arch/mips/kernel/scall64-n32.S
+++ b/arch/mips/kernel/scall64-n32.S
@@ -418,4 +418,5 @@ EXPORT(sysn32_call_table)
PTR compat_sys_rt_tgsigqueueinfo /* 5295 */
PTR sys_perf_event_open
PTR sys_accept4
+ PTR compat_sys_recvmmsg
.size sysn32_call_table,.-sysn32_call_table
diff --git a/arch/mips/kernel/scall64-o32.S b/arch/mips/kernel/scall64-o32.S
index 9bbf9775e0bd..d0eff53d7cb9 100644
--- a/arch/mips/kernel/scall64-o32.S
+++ b/arch/mips/kernel/scall64-o32.S
@@ -538,4 +538,5 @@ sys_call_table:
PTR compat_sys_rt_tgsigqueueinfo
PTR sys_perf_event_open
PTR sys_accept4
+ PTR compat_sys_recvmmsg
.size sys_call_table,.-sys_call_table