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authorTom Herbert <tom@herbertland.com>2016-03-07 14:11:03 -0800
committerDavid S. Miller <davem@davemloft.net>2016-03-09 16:36:13 -0500
commitf092276d85b82504e8a07498f4e9e0c51f06745c (patch)
treec1d130980b720167581a0f74a9a8bd2746e8cee2 /net/socket.c
parent28a94d8fb35b3a75b802f368ae6f4a9f6b0d435a (diff)
downloadlinux-f092276d85b82504e8a07498f4e9e0c51f06745c.tar.bz2
net: Add MSG_BATCH flag
Add a new msg flag called MSG_BATCH. This flag is used in sendmsg to indicate that more messages will follow (i.e. a batch of messages is being sent). This is similar to MSG_MORE except that the following messages are not merged into one packet, they are sent individually. sendmmsg is updated so that each contained message except for the last one is marked as MSG_BATCH. MSG_BATCH is a performance optimization in cases where a socket implementation can benefit by transmitting packets in a batch. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/socket.c')
-rw-r--r--net/socket.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/net/socket.c b/net/socket.c
index 0dd4dd818f41..886649c88d8f 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2008,6 +2008,7 @@ int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
struct compat_mmsghdr __user *compat_entry;
struct msghdr msg_sys;
struct used_address used_address;
+ unsigned int oflags = flags;
if (vlen > UIO_MAXIOV)
vlen = UIO_MAXIOV;
@@ -2022,8 +2023,12 @@ int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
entry = mmsg;
compat_entry = (struct compat_mmsghdr __user *)mmsg;
err = 0;
+ flags |= MSG_BATCH;
while (datagrams < vlen) {
+ if (datagrams == vlen - 1)
+ flags = oflags;
+
if (MSG_CMSG_COMPAT & flags) {
err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
&msg_sys, flags, &used_address, MSG_EOR);