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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 /include/net/compat.h
parentc05e85a06e376f6b6d59e71e5333d707e956d78b (diff)
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op-kernel-dev-a2e2725541fad72416326798c2d7fa4dafb7d337.tar.gz
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 'include/net/compat.h')
-rw-r--r--include/net/compat.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/net/compat.h b/include/net/compat.h
index 7c30028..9679f05 100644
--- a/include/net/compat.h
+++ b/include/net/compat.h
@@ -18,6 +18,11 @@ struct compat_msghdr {
compat_uint_t msg_flags;
};
+struct compat_mmsghdr {
+ struct compat_msghdr msg_hdr;
+ compat_uint_t msg_len;
+};
+
struct compat_cmsghdr {
compat_size_t cmsg_len;
compat_int_t cmsg_level;
@@ -35,6 +40,9 @@ extern int get_compat_msghdr(struct msghdr *, struct compat_msghdr __user *);
extern int verify_compat_iovec(struct msghdr *, struct iovec *, struct sockaddr *, int);
extern asmlinkage long compat_sys_sendmsg(int,struct compat_msghdr __user *,unsigned);
extern asmlinkage long compat_sys_recvmsg(int,struct compat_msghdr __user *,unsigned);
+extern asmlinkage long compat_sys_recvmmsg(int, struct compat_mmsghdr __user *,
+ unsigned, unsigned,
+ struct timespec __user *);
extern asmlinkage long compat_sys_getsockopt(int, int, int, char __user *, int __user *);
extern int put_cmsg_compat(struct msghdr*, int, int, int, void *);
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