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Add support for tap vectored send 

This is adapted from kvm-userspace.  It allows readv to be used with tap when
the host supports it.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6074 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2008-12-17 19:17:17 +00:00
parent fbe78f4f55
commit b535b7b2f7
1 changed files with 18 additions and 0 deletions
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18
net.c
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@ -620,6 +620,21 @@ typedef struct TAPState {
char down_script[1024];
} TAPState;
#ifdef HAVE_IOVEC
static ssize_t tap_receive_iov(void *opaque, const struct iovec *iov,
int iovcnt)
{
TAPState *s = opaque;
ssize_t len;
do {
len = writev(s->fd, iov, iovcnt);
} while (len == -1 && (errno == EINTR || errno == EAGAIN));
return len;
}
#endif
static void tap_receive(void *opaque, const uint8_t *buf, int size)
{
TAPState *s = opaque;
@ -664,6 +679,9 @@ static TAPState *net_tap_fd_init(VLANState *vlan, int fd)
return NULL;
s->fd = fd;
s->vc = qemu_new_vlan_client(vlan, tap_receive, NULL, s);
#ifdef HAVE_IOVEC
s->vc->fd_readv = tap_receive_iov;
#endif
qemu_set_fd_handler(s->fd, tap_send, NULL, s);
snprintf(s->vc->info_str, sizeof(s->vc->info_str), "tap: fd=%d", fd);
return s;