From b535b7b2f73803146fcd442c7df8f90d48b1967f Mon Sep 17 00:00:00 2001 From: aliguori Date: Wed, 17 Dec 2008 19:17:17 +0000 Subject: [PATCH] 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 git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6074 c046a42c-6fe2-441c-8c8c-71466251a162 --- net.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/net.c b/net.c index e18e36b20e..c796035006 100644 --- a/net.c +++ b/net.c @@ -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; -- 2.11.4.GIT