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| author | Stefano Stabellini <sstabellini@kernel.org> | 2017-10-31 01:40:59 +0300 |
|---|---|---|
| committer | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2017-10-31 16:05:53 +0300 |
| commit | 45ddce214a797de65c0418bebf90c1b564c3ee3d (patch) | |
| tree | 0052d1e964d166a212d461ffba2e020d8398a2e5 /drivers/xen/pvcalls-front.h | |
| parent | 9774c6cca26610d065a75d2ac8c5e3fcf0a209b3 (diff) | |
| download | linux-45ddce214a797de65c0418bebf90c1b564c3ee3d.tar.xz | |
xen/pvcalls: implement sendmsg
Send data to an active socket by copying data to the "out" ring. Take
the active socket out_mutex so that only one function can access the
ring at any given time.
If not enough room is available on the ring, rather than returning
immediately or sleep-waiting, spin for up to 5000 cycles. This small
optimization turns out to improve performance significantly.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'drivers/xen/pvcalls-front.h')
| -rw-r--r-- | drivers/xen/pvcalls-front.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/xen/pvcalls-front.h b/drivers/xen/pvcalls-front.h index ab4f1dad3142..d937c24c90c3 100644 --- a/drivers/xen/pvcalls-front.h +++ b/drivers/xen/pvcalls-front.h @@ -13,5 +13,8 @@ int pvcalls_front_listen(struct socket *sock, int backlog); int pvcalls_front_accept(struct socket *sock, struct socket *newsock, int flags); +int pvcalls_front_sendmsg(struct socket *sock, + struct msghdr *msg, + size_t len); #endif |