search for: msg_control

On Thu, Sep 06, 2018 at 12:05:23PM +0800, Jason Wang wrote: > This patch introduces to a new tun/tap specific msg_control: > > #define TUN_MSG_UBUF 1 > #define TUN_MSG_PTR 2 > struct tun_msg_ctl { > int type; > void *ptr; > }; > > This allows us to pass different kinds of msg_control through > sendmsg(). The first supported type is ubuf (TUN_MSG_UBUF) which will > be u...

This patch introduces to a new tun/tap specific msg_control: #define TUN_MSG_UBUF 1 #define TUN_MSG_PTR 2 struct tun_msg_ctl { int type; void *ptr; }; This allows us to pass different kinds of msg_control through sendmsg(). The first supported type is ubuf (TUN_MSG_UBUF) which will be used by the existed vhost_net zerocopy code. The second...

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 This is v3. v3: - move freeing skb from vhost to tun/tap recvmsg() to not confuse the callers. v2: - add Matthew as the

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 This is v3. v3: - move freeing skb from vhost to tun/tap recvmsg() to not confuse the callers. v2: - add Matthew as the

...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 msg->msg_control with new 'skb' when calling tun/tap_do_read() v3: - move freeing skb from vhost to tun/tap recvmsg() to not confuse the callers. v2: - add Matthew as the reporter, thanks matthew. - moving zero headcount check ahead instead of defer consuming skb due to jason and mst's comment. -...

...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 msg->msg_control with new 'skb' when calling tun/tap_do_read() v3: - move freeing skb from vhost to tun/tap recvmsg() to not confuse the callers. v2: - add Matthew as the reporter, thanks matthew. - moving zero headcount check ahead instead of defer consuming skb due to jason and mst's comment. -...

...al idea was that once we start doing zcopy, we keep using the heads ring even for short packets until no zcopy is outstanding. What's the logic behind (nvq->upend_idx + 1) % UIO_MAXIOV != nvq->done_idx here? > + && vhost_net_tx_select_zcopy(net); > > /* use msg_control to pass vhost zerocopy ubuf info to skb */ > if (zcopy_used) { > + struct ubuf_info *ubuf; > + ubuf = nvq->ubuf_info + nvq->upend_idx; > + > vq->heads[nvq->upend_idx].id = head; > - if (!vhost_net_tx_select_zcopy(net) || > - len < VHOST_GOODCOP...

...al idea was that once we start doing zcopy, we keep using the heads ring even for short packets until no zcopy is outstanding. What's the logic behind (nvq->upend_idx + 1) % UIO_MAXIOV != nvq->done_idx here? > + && vhost_net_tx_select_zcopy(net); > > /* use msg_control to pass vhost zerocopy ubuf info to skb */ > if (zcopy_used) { > + struct ubuf_info *ubuf; > + ubuf = nvq->ubuf_info + nvq->upend_idx; > + > vq->heads[nvq->upend_idx].id = head; > - if (!vhost_net_tx_select_zcopy(net) || > - len < VHOST_GOODCOP...

...ers/vhost/net.c index 8d626d7..e302e08 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -778,16 +778,6 @@ static void handle_rx(struct vhost_net *net) /* On error, stop handling until the next kick. */ if (unlikely(headcount < 0)) goto out; - if (nvq->rx_array) - msg.msg_control = vhost_net_buf_consume(&nvq->rxq); - /* On overrun, truncate and discard */ - if (unlikely(headcount > UIO_MAXIOV)) { - iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); - err = sock->ops->recvmsg(sock, &msg, - 1, MSG_DONTWAIT | MSG_TRUNC); - pr_debug(&quo...

...ers/vhost/net.c index 8d626d7..e302e08 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -778,16 +778,6 @@ static void handle_rx(struct vhost_net *net) /* On error, stop handling until the next kick. */ if (unlikely(headcount < 0)) goto out; - if (nvq->rx_array) - msg.msg_control = vhost_net_buf_consume(&nvq->rxq); - /* On overrun, truncate and discard */ - if (unlikely(headcount > UIO_MAXIOV)) { - iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); - err = sock->ops->recvmsg(sock, &msg, - 1, MSG_DONTWAIT | MSG_TRUNC); - pr_debug(&quo...

...net.c >> +++ b/drivers/vhost/net.c >> @@ -778,16 +778,6 @@ static void handle_rx(struct vhost_net *net) >> /* On error, stop handling until the next kick. */ >> if (unlikely(headcount < 0)) >> goto out; >> - if (nvq->rx_array) >> - msg.msg_control = vhost_net_buf_consume(&nvq->rxq); >> - /* On overrun, truncate and discard */ >> - if (unlikely(headcount > UIO_MAXIOV)) { >> - iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); >> - err = sock->ops->recvmsg(sock, &msg, >> - 1,...

...net.c >> +++ b/drivers/vhost/net.c >> @@ -778,16 +778,6 @@ static void handle_rx(struct vhost_net *net) >> /* On error, stop handling until the next kick. */ >> if (unlikely(headcount < 0)) >> goto out; >> - if (nvq->rx_array) >> - msg.msg_control = vhost_net_buf_consume(&nvq->rxq); >> - /* On overrun, truncate and discard */ >> - if (unlikely(headcount > UIO_MAXIOV)) { >> - iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); >> - err = sock->ops->recvmsg(sock, &msg, >> - 1,...

...vers/vhost/net.c index 8d626d7..e76535e 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -778,8 +778,6 @@ static void handle_rx(struct vhost_net *net) /* On error, stop handling until the next kick. */ if (unlikely(headcount < 0)) goto out; - if (nvq->rx_array) - msg.msg_control = vhost_net_buf_consume(&nvq->rxq); /* On overrun, truncate and discard */ if (unlikely(headcount > UIO_MAXIOV)) { iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); @@ -809,6 +807,8 @@ static void handle_rx(struct vhost_net *net) */ iov_iter_advance(&msg.msg...

...vers/vhost/net.c index 8d626d7..e76535e 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -778,8 +778,6 @@ static void handle_rx(struct vhost_net *net) /* On error, stop handling until the next kick. */ if (unlikely(headcount < 0)) goto out; - if (nvq->rx_array) - msg.msg_control = vhost_net_buf_consume(&nvq->rxq); /* On overrun, truncate and discard */ if (unlikely(headcount > UIO_MAXIOV)) { iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); @@ -809,6 +807,8 @@ static void handle_rx(struct vhost_net *net) */ iov_iter_advance(&msg.msg...

Hi all: This series tries to batch submitting packets to underlayer socket through msg_control during sendmsg(). This is done by: 1) Doing userspace copy inside vhost_net 2) Build XDP buff 3) Batch at most 64 (VHOST_NET_BATCH) XDP buffs and submit them once through msg_control during sendmsg(). 4) Underlayer sockets can use XDP buffs directly when XDP is enalbed, or build skb based on...

Hi all: This series tries to batch submitting packets to underlayer socket through msg_control during sendmsg(). This is done by: 1) Doing userspace copy inside vhost_net 2) Build XDP buff 3) Batch at most 64 (VHOST_NET_BATCH) XDP buffs and submit them once through msg_control during sendmsg(). 4) Underlayer sockets can use XDP buffs directly when XDP is enalbed, or build skb based on...

Hi all: This series tries to batch submitting packets to underlayer socket through msg_control during sendmsg(). This is done by: 1) Doing userspace copy inside vhost_net 2) Build XDP buff 3) Batch at most 64 (VHOST_NET_BATCH) XDP buffs and submit them once through msg_control during sendmsg(). 4) Underlayer sockets can use XDP buffs directly when XDP is enalbed, or build skb based on...

From: Wei Xu <wexu at redhat.com> tun_recvmsg() supports accepting skb by msg_control after commit ac77cfd4258f ("tun: support receiving skb through msg_control"), the skb if presented should be freed within the function, otherwise it would be leaked. Signed-off-by: Wei Xu <wexu at redhat.com> Reported-by: Matthew Rosato <mjrosato at linux.vnet.ibm.com> --- d...

...= zcopy && (len >= VHOST_GOODCOPY_LEN || - nvq->upend_idx != nvq->done_idx); + + zcopy_used = zcopy && len >= VHOST_GOODCOPY_LEN + && (nvq->upend_idx + 1) % UIO_MAXIOV != nvq->done_idx + && vhost_net_tx_select_zcopy(net); /* use msg_control to pass vhost zerocopy ubuf info to skb */ if (zcopy_used) { + struct ubuf_info *ubuf; + ubuf = nvq->ubuf_info + nvq->upend_idx; + vq->heads[nvq->upend_idx].id = head; - if (!vhost_net_tx_select_zcopy(net) || - len < VHOST_GOODCOPY_LEN) { - /* copy don't nee...

...(len >= VHOST_GOODCOPY_LEN || - nvq->upend_idx != nvq->done_idx); + + zcopy_used = zcopy && len >= VHOST_GOODCOPY_LEN + && (nvq->upend_idx + 1) % UIO_MAXIOV != + nvq->done_idx + && vhost_net_tx_select_zcopy(net); /* use msg_control to pass vhost zerocopy ubuf info to skb */ if (zcopy_used) { + struct ubuf_info *ubuf; + ubuf = nvq->ubuf_info + nvq->upend_idx; + vq->heads[nvq->upend_idx].id = head; - if (!vhost_net_tx_select_zcopy(net) || - len < VHOST_GOODCOPY_LEN) { - /* copy don't nee...