linux-stable/include/net/compat.h
Anton Blanchard 228e548e60 net: Add sendmmsg socket system call
This patch adds a multiple message send syscall and is the send
version of the existing recvmmsg syscall. This is heavily
based on the patch by Arnaldo that added recvmmsg.

I wrote a microbenchmark to test the performance gains of using
this new syscall:

http://ozlabs.org/~anton/junkcode/sendmmsg_test.c

The test was run on a ppc64 box with a 10 Gbit network card. The
benchmark can send both UDP and RAW ethernet packets.

64B UDP

batch   pkts/sec
1       804570
2       872800 (+ 8 %)
4       916556 (+14 %)
8       939712 (+17 %)
16      952688 (+18 %)
32      956448 (+19 %)
64      964800 (+20 %)

64B raw socket

batch   pkts/sec
1       1201449
2       1350028 (+12 %)
4       1461416 (+22 %)
8       1513080 (+26 %)
16      1541216 (+28 %)
32      1553440 (+29 %)
64      1557888 (+30 %)

We see a 20% improvement in throughput on UDP send and 30%
on raw socket send.

[ Add sparc syscall entries. -DaveM ]

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-05-05 11:10:14 -07:00

63 lines
2 KiB
C

#ifndef NET_COMPAT_H
#define NET_COMPAT_H
struct sock;
#if defined(CONFIG_COMPAT)
#include <linux/compat.h>
struct compat_msghdr {
compat_uptr_t msg_name; /* void * */
compat_int_t msg_namelen;
compat_uptr_t msg_iov; /* struct compat_iovec * */
compat_size_t msg_iovlen;
compat_uptr_t msg_control; /* void * */
compat_size_t msg_controllen;
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;
compat_int_t cmsg_type;
};
extern int compat_sock_get_timestamp(struct sock *, struct timeval __user *);
extern int compat_sock_get_timestampns(struct sock *, struct timespec __user *);
#else /* defined(CONFIG_COMPAT) */
/*
* To avoid compiler warnings:
*/
#define compat_msghdr msghdr
#define compat_mmsghdr mmsghdr
#endif /* defined(CONFIG_COMPAT) */
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_sendmmsg(int, struct compat_mmsghdr __user *,
unsigned, 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 compat_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 *);
extern int cmsghdr_from_user_compat_to_kern(struct msghdr *, struct sock *, unsigned char *, int);
extern int compat_mc_setsockopt(struct sock *, int, int, char __user *, unsigned int,
int (*)(struct sock *, int, int, char __user *, unsigned int));
extern int compat_mc_getsockopt(struct sock *, int, int, char __user *,
int __user *, int (*)(struct sock *, int, int, char __user *,
int __user *));
#endif /* NET_COMPAT_H */