search for: tun_put

...k_recv_errqueue(sock->sk, m, total_len, @@ -2087,6 +2090,11 @@ static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len, m->msg_flags |= MSG_TRUNC; ret = flags & MSG_TRUNC ? ret : total_len; } + goto out; + +out_free_skb: + if (skb) + kfree_skb(skb); out: tun_put(tun); return ret; -- 1.8.3.1

As multi-queue nics were commonly used for high-end servers, current single queue based tap can not satisfy the requirement of scaling guest network performance as the numbers of vcpus increase. So the following series implements multiple queue support in tun/tap. In order to take advantages of this, a multi-queue capable driver and qemu were also needed. I just rebase the latest version of

As multi-queue nics were commonly used for high-end servers, current single queue based tap can not satisfy the requirement of scaling guest network performance as the numbers of vcpus increase. So the following series implements multiple queue support in tun/tap. In order to take advantages of this, a multi-queue capable driver and qemu were also needed. I just rebase the latest version of

..._iter, flags & MSG_DONTWAIT, skb); > if (ret > (ssize_t)total_len) { > m->msg_flags |= MSG_TRUNC; > ret = flags & MSG_TRUNC ? ret : total_len; > @@ -2092,6 +2097,13 @@ static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len, > out: > tun_put(tun); > return ret; > + > +out_put_tun: > + tun_put(tun); > +out_free_skb: > + if (skb) > + kfree_skb(skb); > + return ret; > } > > static int tun_peek_len(struct socket *sock) > -- > 1.8.3.1

...ead(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT, skb); if (ret > (ssize_t)total_len) { m->msg_flags |= MSG_TRUNC; ret = flags & MSG_TRUNC ? ret : total_len; @@ -2092,6 +2097,13 @@ static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len, out: tun_put(tun); return ret; + +out_put_tun: + tun_put(tun); +out_free_skb: + if (skb) + kfree_skb(skb); + return ret; } static int tun_peek_len(struct socket *sock) -- 1.8.3.1

...static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from) if (!tun) return -EBADFD; - result = tun_get_user(tun, tfile, NULL, from, file->f_flags & O_NONBLOCK); + result = tun_get_user(tun, tfile, NULL, from, + file->f_flags & O_NONBLOCK, false); tun_put(tun); return result; @@ -1570,7 +1607,8 @@ static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) return -EBADFD; ret = tun_get_user(tun, tfile, m->msg_control, &m->msg_iter, - m->msg_flags & MSG_DONTWAIT); + m->msg_flags & MSG_DON...

...static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from) if (!tun) return -EBADFD; - result = tun_get_user(tun, tfile, NULL, from, file->f_flags & O_NONBLOCK); + result = tun_get_user(tun, tfile, NULL, from, + file->f_flags & O_NONBLOCK, false); tun_put(tun); return result; @@ -1570,7 +1619,8 @@ static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) return -EBADFD; ret = tun_get_user(tun, tfile, m->msg_control, &m->msg_iter, - m->msg_flags & MSG_DONTWAIT); + m->msg_flags & MSG_DON...

...static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from) if (!tun) return -EBADFD; - result = tun_get_user(tun, tfile, NULL, from, file->f_flags & O_NONBLOCK); + result = tun_get_user(tun, tfile, NULL, from, + file->f_flags & O_NONBLOCK, false); tun_put(tun); return result; @@ -1569,7 +1606,8 @@ static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) return -EBADFD; ret = tun_get_user(tun, tfile, m->msg_control, &m->msg_iter, - m->msg_flags & MSG_DONTWAIT); + m->msg_flags & MSG_DON...

...static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from) if (!tun) return -EBADFD; - result = tun_get_user(tun, tfile, NULL, from, file->f_flags & O_NONBLOCK); + result = tun_get_user(tun, tfile, NULL, from, + file->f_flags & O_NONBLOCK, false); tun_put(tun); return result; @@ -1570,7 +1607,8 @@ static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) return -EBADFD; ret = tun_get_user(tun, tfile, m->msg_control, &m->msg_iter, - m->msg_flags & MSG_DONTWAIT); + m->msg_flags & MSG_DON...

Hi: This series tries to implement tx batching support for vhost. This was done by using MSG_MORE as a hint for under layer socket. The backend (e.g tap) can then batch the packets temporarily in a list and submit it all once the number of bacthed exceeds a limitation. Tests shows obvious improvement on guest pktgen over over mlx4(noqueue) on host: Mpps -+%

Hi: This series tries to implement tx batching support for vhost. This was done by using MSG_MORE as a hint for under layer socket. The backend (e.g tap) can then batch the packets temporarily in a list and submit it all once the number of bacthed exceeds a limitation. Tests shows obvious improvement on guest pktgen over over mlx4(noqueue) on host: Mpps -+%

From: Wei Xu <wexu at redhat.com> Matthew found a roughly 40% tcp throughput regression with commit c67df11f(vhost_net: try batch dequing from skb array) as discussed in the following thread: https://www.mail-archive.com/netdev at vger.kernel.org/msg187936.html v4: - fix zero iov iterator count in tap/tap_do_read()(Jason) - don't put tun in case of EBADFD(Jason) - Replace

From: Wei Xu <wexu at redhat.com> Matthew found a roughly 40% tcp throughput regression with commit c67df11f(vhost_net: try batch dequing from skb array) as discussed in the following thread: https://www.mail-archive.com/netdev at vger.kernel.org/msg187936.html v4: - fix zero iov iterator count in tap/tap_do_read()(Jason) - don't put tun in case of EBADFD(Jason) - Replace

Hi: This series tries to implement tx batching support for vhost. This was done by using MSG_MORE as a hint for under layer socket. The backend (e.g tap) can then batch the packets temporarily in a list and submit it all once the number of bacthed exceeds a limitation. Tests shows obvious improvement on guest pktgen over over mlx4(noqueue) on host: Mpps -+%

Hi: This series tries to implement tx batching support for vhost. This was done by using MSG_MORE as a hint for under layer socket. The backend (e.g tap) can then batch the packets temporarily in a list and submit it all once the number of bacthed exceeds a limitation. Tests shows obvious improvement on guest pktgen over over mlx4(noqueue) on host: Mpps -+%

...t kiocb *iocb, struct iov_iter *from) > if (!tun) > return -EBADFD; > > - result = tun_get_user(tun, tfile, NULL, from, file->f_flags & O_NONBLOCK); > + result = tun_get_user(tun, tfile, NULL, from, > + file->f_flags & O_NONBLOCK, false); > > tun_put(tun); > return result; > @@ -1570,7 +1607,8 @@ static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) > return -EBADFD; > > ret = tun_get_user(tun, tfile, m->msg_control, &m->msg_iter, > - m->msg_flags & MSG_DONTWAIT); > +...

...t kiocb *iocb, struct iov_iter *from) > if (!tun) > return -EBADFD; > > - result = tun_get_user(tun, tfile, NULL, from, file->f_flags & O_NONBLOCK); > + result = tun_get_user(tun, tfile, NULL, from, > + file->f_flags & O_NONBLOCK, false); > > tun_put(tun); > return result; > @@ -1570,7 +1607,8 @@ static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) > return -EBADFD; > > ret = tun_get_user(tun, tfile, m->msg_control, &m->msg_iter, > - m->msg_flags & MSG_DONTWAIT); > +...

...s & TUN_FASYNC) kill_fasync(&tun->fasync, SIGIO, POLL_IN); - wake_up_interruptible(&tun->socket.wait); + wake_up_interruptible_poll(&tun->socket.wait, POLLIN | + POLLRDNORM | POLLRDBAND); return NETDEV_TX_OK; drop: @@ -743,7 +746,7 @@ static __inline__ ssize_t tun_put_user(struct tun_struct *tun, len = min_t(int, skb->len, len); skb_copy_datagram_const_iovec(skb, 0, iv, total, len); - total += len; + total += skb->len; tun->dev->stats.tx_packets++; tun->dev->stats.tx_bytes += len; @@ -751,34 +754,23 @@ static __inline__ ssize_t tun_...

...s & TUN_FASYNC) kill_fasync(&tun->fasync, SIGIO, POLL_IN); - wake_up_interruptible(&tun->socket.wait); + wake_up_interruptible_poll(&tun->socket.wait, POLLIN | + POLLRDNORM | POLLRDBAND); return NETDEV_TX_OK; drop: @@ -743,7 +746,7 @@ static __inline__ ssize_t tun_put_user(struct tun_struct *tun, len = min_t(int, skb->len, len); skb_copy_datagram_const_iovec(skb, 0, iv, total, len); - total += len; + total += skb->len; tun->dev->stats.tx_packets++; tun->dev->stats.tx_bytes += len; @@ -751,34 +754,23 @@ static __inline__ ssize_t tun_...

...s & TUN_FASYNC) kill_fasync(&tun->fasync, SIGIO, POLL_IN); - wake_up_interruptible(&tun->socket.wait); + wake_up_interruptible_poll(&tun->socket.wait, POLLIN | + POLLRDNORM | POLLRDBAND); return NETDEV_TX_OK; drop: @@ -743,7 +746,7 @@ static __inline__ ssize_t tun_put_user(struct tun_struct *tun, len = min_t(int, skb->len, len); skb_copy_datagram_const_iovec(skb, 0, iv, total, len); - total += len; + total += skb->len; tun->dev->stats.tx_packets++; tun->dev->stats.tx_bytes += len; @@ -751,34 +754,23 @@ static __inline__ ssize_t tun_...