thr3ads.net - Linux Virtualization - [PATCH v3 17/18] vhost: don't bother copying iovecs in handle_rx(), kill memcpy

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Al Viro

2015-Feb-04 06:40 UTC

[PATCH v3 17/18] vhost: don't bother copying iovecs in handle_rx(), kill memcpy_toiovecend()

From: Al Viro <viro at zeniv.linux.org.uk>

Cc: Michael S. Tsirkin <mst at redhat.com>
Cc: kvm at vger.kernel.org
Cc: virtualization at lists.linux-foundation.org
Signed-off-by: Al Viro <viro at zeniv.linux.org.uk>
---
 drivers/vhost/net.c | 82 +++++++++++++++--------------------------------------
 include/linux/uio.h |  3 --
 lib/iovec.c         | 26 -----------------
 3 files changed, 23 insertions(+), 88 deletions(-)

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index d86cc9b..e022cc4 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -84,10 +84,6 @@ struct vhost_net_ubuf_ref {
 
 struct vhost_net_virtqueue {
 	struct vhost_virtqueue vq;
-	/* hdr is used to store the virtio header.
-	 * Since each iovec has >= 1 byte length, we never need more than
-	 * header length entries to store the header. */
-	struct iovec hdr[sizeof(struct virtio_net_hdr_mrg_rxbuf)];
 	size_t vhost_hlen;
 	size_t sock_hlen;
 	/* vhost zerocopy support fields below: */
@@ -235,44 +231,6 @@ static bool vhost_sock_zcopy(struct socket *sock)
 		sock_flag(sock->sk, SOCK_ZEROCOPY);
 }
 
-/* Pop first len bytes from iovec. Return number of segments used. */
-static int move_iovec_hdr(struct iovec *from, struct iovec *to,
-			  size_t len, int iov_count)
-{
-	int seg = 0;
-	size_t size;
-
-	while (len && seg < iov_count) {
-		size = min(from->iov_len, len);
-		to->iov_base = from->iov_base;
-		to->iov_len = size;
-		from->iov_len -= size;
-		from->iov_base += size;
-		len -= size;
-		++from;
-		++to;
-		++seg;
-	}
-	return seg;
-}
-/* Copy iovec entries for len bytes from iovec. */
-static void copy_iovec_hdr(const struct iovec *from, struct iovec *to,
-			   size_t len, int iovcount)
-{
-	int seg = 0;
-	size_t size;
-
-	while (len && seg < iovcount) {
-		size = min(from->iov_len, len);
-		to->iov_base = from->iov_base;
-		to->iov_len = size;
-		len -= size;
-		++from;
-		++to;
-		++seg;
-	}
-}
-
 /* In case of DMA done not in order in lower device driver for some reason.
  * upend_idx is used to track end of used idx, done_idx is used to track head
  * of used idx. Once lower device DMA done contiguously, we will signal KVM
@@ -570,9 +528,9 @@ static void handle_rx(struct vhost_net *net)
 		.msg_controllen = 0,
 		.msg_flags = MSG_DONTWAIT,
 	};
-	struct virtio_net_hdr_mrg_rxbuf hdr = {
-		.hdr.flags = 0,
-		.hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE
+	struct virtio_net_hdr hdr = {
+		.flags = 0,
+		.gso_type = VIRTIO_NET_HDR_GSO_NONE
 	};
 	size_t total_len = 0;
 	int err, mergeable;
@@ -580,6 +538,7 @@ static void handle_rx(struct vhost_net *net)
 	size_t vhost_hlen, sock_hlen;
 	size_t vhost_len, sock_len;
 	struct socket *sock;
+	struct iov_iter fixup;
 
 	mutex_lock(&vq->mutex);
 	sock = vq->private_data;
@@ -624,14 +583,19 @@ static void handle_rx(struct vhost_net *net)
 			break;
 		}
 		/* We don't need to be notified again. */
-		if (unlikely((vhost_hlen)))
-			/* Skip header. TODO: support TSO. */
-			move_iovec_hdr(vq->iov, nvq->hdr, vhost_hlen, in);
-		else
-			/* Copy the header for use in VIRTIO_NET_F_MRG_RXBUF:
-			 * needed because recvmsg can modify msg_iov. */
-			copy_iovec_hdr(vq->iov, nvq->hdr, sock_hlen, in);
-		iov_iter_init(&msg.msg_iter, READ, vq->iov, in, sock_len);
+		iov_iter_init(&msg.msg_iter, READ, vq->iov, in, vhost_len);
+		fixup = msg.msg_iter;
+		if (unlikely((vhost_hlen))) {
+			/* We will supply the header ourselves
+			 * TODO: support TSO.
+			 */
+			iov_iter_advance(&msg.msg_iter, vhost_hlen);
+		} else {
+			/* It'll come from socket; we'll need to patch
+			 * ->num_buffers over if VIRTIO_NET_F_MRG_RXBUF
+			 */
+			iov_iter_advance(&fixup, sizeof(hdr));
+		}
 		err = sock->ops->recvmsg(NULL, sock, &msg,
 					 sock_len, MSG_DONTWAIT | MSG_TRUNC);
 		/* Userspace might have consumed the packet meanwhile:
@@ -643,18 +607,18 @@ static void handle_rx(struct vhost_net *net)
 			vhost_discard_vq_desc(vq, headcount);
 			continue;
 		}
+		/* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */
 		if (unlikely(vhost_hlen) &&
-		    memcpy_toiovecend(nvq->hdr, (unsigned char *)&hdr, 0,
-				      vhost_hlen)) {
+		    copy_to_iter(&hdr, sizeof(hdr), &fixup) != sizeof(hdr)) {
 			vq_err(vq, "Unable to write vnet_hdr at addr %p\n",
 			       vq->iov->iov_base);
 			break;
 		}
-		/* TODO: Should check and handle checksum. */
+		/* Supply (or replace) ->num_buffers if VIRTIO_NET_F_MRG_RXBUF
+		 * TODO: Should check and handle checksum.
+		 */
 		if (likely(mergeable) &&
-		    memcpy_toiovecend(nvq->hdr, (unsigned char *)&headcount,
-				      offsetof(typeof(hdr), num_buffers),
-				      sizeof hdr.num_buffers)) {
+		    copy_to_iter(&headcount, 2, &fixup) != 2) {
 			vq_err(vq, "Failed num_buffers write");
 			vhost_discard_vq_desc(vq, headcount);
 			break;
diff --git a/include/linux/uio.h b/include/linux/uio.h
index af3439f..02bd8a9 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -137,7 +137,4 @@ size_t csum_and_copy_from_iter(void *addr, size_t bytes,
__wsum *csum, struct io
 
 int memcpy_fromiovecend(unsigned char *kdata, const struct iovec *iov,
 			int offset, int len);
-int memcpy_toiovecend(const struct iovec *v, unsigned char *kdata,
-		      int offset, int len);
-
 #endif
diff --git a/lib/iovec.c b/lib/iovec.c
index 4a90875..d8f17a9 100644
--- a/lib/iovec.c
+++ b/lib/iovec.c
@@ -3,32 +3,6 @@
 #include <linux/uio.h>
 
 /*
- *	Copy kernel to iovec. Returns -EFAULT on error.
- */
-
-int memcpy_toiovecend(const struct iovec *iov, unsigned char *kdata,
-		      int offset, int len)
-{
-	int copy;
-	for (; len > 0; ++iov) {
-		/* Skip over the finished iovecs */
-		if (unlikely(offset >= iov->iov_len)) {
-			offset -= iov->iov_len;
-			continue;
-		}
-		copy = min_t(unsigned int, iov->iov_len - offset, len);
-		if (copy_to_user(iov->iov_base + offset, kdata, copy))
-			return -EFAULT;
-		offset = 0;
-		kdata += copy;
-		len -= copy;
-	}
-
-	return 0;
-}
-EXPORT_SYMBOL(memcpy_toiovecend);
-
-/*
  *	Copy iovec to kernel. Returns -EFAULT on error.
  */
 
-- 
2.1.4

Michael S. Tsirkin

2015-Feb-04 08:52 UTC

head link

[PATCH v3 17/18] vhost: don't bother copying iovecs in handle_rx(), kill memcpy_toiovecend()

On Wed, Feb 04, 2015 at 06:40:08AM +0000, Al Viro wrote:> From: Al Viro <viro at zeniv.linux.org.uk>
> 
> Cc: Michael S. Tsirkin <mst at redhat.com>
> Cc: kvm at vger.kernel.org
> Cc: virtualization at lists.linux-foundation.org
> Signed-off-by: Al Viro <viro at zeniv.linux.org.uk>
Acked-by: Michael S. Tsirkin <mst at redhat.com>
> ---
>  drivers/vhost/net.c | 82
+++++++++++++++--------------------------------------
>  include/linux/uio.h |  3 --
>  lib/iovec.c         | 26 -----------------
>  3 files changed, 23 insertions(+), 88 deletions(-)
> 
> diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
> index d86cc9b..e022cc4 100644
> --- a/drivers/vhost/net.c
> +++ b/drivers/vhost/net.c
> @@ -84,10 +84,6 @@ struct vhost_net_ubuf_ref {
>  
>  struct vhost_net_virtqueue {
>  	struct vhost_virtqueue vq;
> -	/* hdr is used to store the virtio header.
> -	 * Since each iovec has >= 1 byte length, we never need more than
> -	 * header length entries to store the header. */
> -	struct iovec hdr[sizeof(struct virtio_net_hdr_mrg_rxbuf)];
>  	size_t vhost_hlen;
>  	size_t sock_hlen;
>  	/* vhost zerocopy support fields below: */
> @@ -235,44 +231,6 @@ static bool vhost_sock_zcopy(struct socket *sock)
>  		sock_flag(sock->sk, SOCK_ZEROCOPY);
>  }
>  
> -/* Pop first len bytes from iovec. Return number of segments used. */
> -static int move_iovec_hdr(struct iovec *from, struct iovec *to,
> -			  size_t len, int iov_count)
> -{
> -	int seg = 0;
> -	size_t size;
> -
> -	while (len && seg < iov_count) {
> -		size = min(from->iov_len, len);
> -		to->iov_base = from->iov_base;
> -		to->iov_len = size;
> -		from->iov_len -= size;
> -		from->iov_base += size;
> -		len -= size;
> -		++from;
> -		++to;
> -		++seg;
> -	}
> -	return seg;
> -}
> -/* Copy iovec entries for len bytes from iovec. */
> -static void copy_iovec_hdr(const struct iovec *from, struct iovec *to,
> -			   size_t len, int iovcount)
> -{
> -	int seg = 0;
> -	size_t size;
> -
> -	while (len && seg < iovcount) {
> -		size = min(from->iov_len, len);
> -		to->iov_base = from->iov_base;
> -		to->iov_len = size;
> -		len -= size;
> -		++from;
> -		++to;
> -		++seg;
> -	}
> -}
> -
>  /* In case of DMA done not in order in lower device driver for some
reason.
>   * upend_idx is used to track end of used idx, done_idx is used to track
head
>   * of used idx. Once lower device DMA done contiguously, we will signal
KVM
> @@ -570,9 +528,9 @@ static void handle_rx(struct vhost_net *net)
>  		.msg_controllen = 0,
>  		.msg_flags = MSG_DONTWAIT,
>  	};
> -	struct virtio_net_hdr_mrg_rxbuf hdr = {
> -		.hdr.flags = 0,
> -		.hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE
> +	struct virtio_net_hdr hdr = {
> +		.flags = 0,
> +		.gso_type = VIRTIO_NET_HDR_GSO_NONE
>  	};
>  	size_t total_len = 0;
>  	int err, mergeable;
> @@ -580,6 +538,7 @@ static void handle_rx(struct vhost_net *net)
>  	size_t vhost_hlen, sock_hlen;
>  	size_t vhost_len, sock_len;
>  	struct socket *sock;
> +	struct iov_iter fixup;
>  
>  	mutex_lock(&vq->mutex);
>  	sock = vq->private_data;
> @@ -624,14 +583,19 @@ static void handle_rx(struct vhost_net *net)
>  			break;
>  		}
>  		/* We don't need to be notified again. */
> -		if (unlikely((vhost_hlen)))
> -			/* Skip header. TODO: support TSO. */
> -			move_iovec_hdr(vq->iov, nvq->hdr, vhost_hlen, in);
> -		else
> -			/* Copy the header for use in VIRTIO_NET_F_MRG_RXBUF:
> -			 * needed because recvmsg can modify msg_iov. */
> -			copy_iovec_hdr(vq->iov, nvq->hdr, sock_hlen, in);
> -		iov_iter_init(&msg.msg_iter, READ, vq->iov, in, sock_len);
> +		iov_iter_init(&msg.msg_iter, READ, vq->iov, in, vhost_len);
> +		fixup = msg.msg_iter;
> +		if (unlikely((vhost_hlen))) {
> +			/* We will supply the header ourselves
> +			 * TODO: support TSO.
> +			 */
> +			iov_iter_advance(&msg.msg_iter, vhost_hlen);
> +		} else {
> +			/* It'll come from socket; we'll need to patch
> +			 * ->num_buffers over if VIRTIO_NET_F_MRG_RXBUF
> +			 */
> +			iov_iter_advance(&fixup, sizeof(hdr));
> +		}
>  		err = sock->ops->recvmsg(NULL, sock, &msg,
>  					 sock_len, MSG_DONTWAIT | MSG_TRUNC);
>  		/* Userspace might have consumed the packet meanwhile:
> @@ -643,18 +607,18 @@ static void handle_rx(struct vhost_net *net)
>  			vhost_discard_vq_desc(vq, headcount);
>  			continue;
>  		}
> +		/* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */
>  		if (unlikely(vhost_hlen) &&
> -		    memcpy_toiovecend(nvq->hdr, (unsigned char *)&hdr, 0,
> -				      vhost_hlen)) {
> +		    copy_to_iter(&hdr, sizeof(hdr), &fixup) != sizeof(hdr)) {
>  			vq_err(vq, "Unable to write vnet_hdr at addr %p\n",
>  			       vq->iov->iov_base);
>  			break;
>  		}
> -		/* TODO: Should check and handle checksum. */
> +		/* Supply (or replace) ->num_buffers if VIRTIO_NET_F_MRG_RXBUF
> +		 * TODO: Should check and handle checksum.
> +		 */
>  		if (likely(mergeable) &&
> -		    memcpy_toiovecend(nvq->hdr, (unsigned char *)&headcount,
> -				      offsetof(typeof(hdr), num_buffers),
> -				      sizeof hdr.num_buffers)) {
> +		    copy_to_iter(&headcount, 2, &fixup) != 2) {
>  			vq_err(vq, "Failed num_buffers write");
>  			vhost_discard_vq_desc(vq, headcount);
>  			break;
> diff --git a/include/linux/uio.h b/include/linux/uio.h
> index af3439f..02bd8a9 100644
> --- a/include/linux/uio.h
> +++ b/include/linux/uio.h
> @@ -137,7 +137,4 @@ size_t csum_and_copy_from_iter(void *addr, size_t
bytes, __wsum *csum, struct io
>  
>  int memcpy_fromiovecend(unsigned char *kdata, const struct iovec *iov,
>  			int offset, int len);
> -int memcpy_toiovecend(const struct iovec *v, unsigned char *kdata,
> -		      int offset, int len);
> -
>  #endif
> diff --git a/lib/iovec.c b/lib/iovec.c
> index 4a90875..d8f17a9 100644
> --- a/lib/iovec.c
> +++ b/lib/iovec.c
> @@ -3,32 +3,6 @@
>  #include <linux/uio.h>
>  
>  /*
> - *	Copy kernel to iovec. Returns -EFAULT on error.
> - */
> -
> -int memcpy_toiovecend(const struct iovec *iov, unsigned char *kdata,
> -		      int offset, int len)
> -{
> -	int copy;
> -	for (; len > 0; ++iov) {
> -		/* Skip over the finished iovecs */
> -		if (unlikely(offset >= iov->iov_len)) {
> -			offset -= iov->iov_len;
> -			continue;
> -		}
> -		copy = min_t(unsigned int, iov->iov_len - offset, len);
> -		if (copy_to_user(iov->iov_base + offset, kdata, copy))
> -			return -EFAULT;
> -		offset = 0;
> -		kdata += copy;
> -		len -= copy;
> -	}
> -
> -	return 0;
> -}
> -EXPORT_SYMBOL(memcpy_toiovecend);
> -
> -/*
>   *	Copy iovec to kernel. Returns -EFAULT on error.
>   */
>  
> -- 
> 2.1.4

Michael S. Tsirkin

2015-Feb-04 09:02 UTC

head link

[PATCH v3 17/18] vhost: don't bother copying iovecs in handle_rx(), kill memcpy_toiovecend()

>  		if (likely(mergeable) &&
> -		    memcpy_toiovecend(nvq->hdr, (unsigned char *)&headcount,
> -				      offsetof(typeof(hdr), num_buffers),
> -				      sizeof hdr.num_buffers)) {
> +		    copy_to_iter(&headcount, 2, &fixup) != 2) {
>  			vq_err(vq, "Failed num_buffers write");
>  			vhost_discard_vq_desc(vq, headcount);
>  			break;
BTW this will have to be re-based on top of
http://mid.gmane.org/1422896842-19186-1-git-send-email-mst at redhat.com
taking byte-swap into account.

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