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Groups > linux.kernel > #1612658
| From | Jason Wang <jasowang@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH V2 net-next 6/7] tap: support receiving skb from msg_control |
| Date | 2017-03-30 09:30 +0200 |
| Message-ID | <tqCGS-2MS-23@gated-at.bofh.it> (permalink) |
| References | <tqCGR-2MS-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
This patch makes tap_recvmsg() can receive from skb from its caller
through msg_control. Vhost_net will be the first user.
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
drivers/net/tap.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/net/tap.c b/drivers/net/tap.c
index abdaf86..07d9174 100644
--- a/drivers/net/tap.c
+++ b/drivers/net/tap.c
@@ -824,15 +824,17 @@ static ssize_t tap_put_user(struct tap_queue *q,
static ssize_t tap_do_read(struct tap_queue *q,
struct iov_iter *to,
- int noblock)
+ int noblock, struct sk_buff *skb)
{
DEFINE_WAIT(wait);
- struct sk_buff *skb;
ssize_t ret = 0;
if (!iov_iter_count(to))
return 0;
+ if (skb)
+ goto done;
+
while (1) {
if (!noblock)
prepare_to_wait(sk_sleep(&q->sk), &wait,
@@ -856,6 +858,7 @@ static ssize_t tap_do_read(struct tap_queue *q,
if (!noblock)
finish_wait(sk_sleep(&q->sk), &wait);
+done:
if (skb) {
ret = tap_put_user(q, skb, to);
if (unlikely(ret < 0))
@@ -872,7 +875,7 @@ static ssize_t tap_read_iter(struct kiocb *iocb, struct iov_iter *to)
struct tap_queue *q = file->private_data;
ssize_t len = iov_iter_count(to), ret;
- ret = tap_do_read(q, to, file->f_flags & O_NONBLOCK);
+ ret = tap_do_read(q, to, file->f_flags & O_NONBLOCK, NULL);
ret = min_t(ssize_t, ret, len);
if (ret > 0)
iocb->ki_pos = ret;
@@ -1155,7 +1158,8 @@ static int tap_recvmsg(struct socket *sock, struct msghdr *m,
int ret;
if (flags & ~(MSG_DONTWAIT|MSG_TRUNC))
return -EINVAL;
- ret = tap_do_read(q, &m->msg_iter, flags & MSG_DONTWAIT);
+ ret = tap_do_read(q, &m->msg_iter, flags & MSG_DONTWAIT,
+ m->msg_control);
if (ret > total_len) {
m->msg_flags |= MSG_TRUNC;
ret = flags & MSG_TRUNC ? ret : total_len;
--
2.7.4
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[PATCH V2 net-next 0/7] vhost-net rx batching Jason Wang <jasowang@redhat.com> - 2017-03-30 09:30 +0200
[PATCH V2 net-next 6/7] tap: support receiving skb from msg_control Jason Wang <jasowang@redhat.com> - 2017-03-30 09:30 +0200
Re: [PATCH V2 net-next 6/7] tap: support receiving skb from msg_control "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-30 17:10 +0200
Re: [PATCH V2 net-next 6/7] tap: support receiving skb from msg_control Jason Wang <jasowang@redhat.com> - 2017-03-31 06:10 +0200
[PATCH V2 net-next 1/7] ptr_ring: introduce batch dequeuing Jason Wang <jasowang@redhat.com> - 2017-03-30 09:30 +0200
Re: [PATCH V2 net-next 1/7] ptr_ring: introduce batch dequeuing "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-30 16:00 +0200
Re: [PATCH V2 net-next 1/7] ptr_ring: introduce batch dequeuing Jason Wang <jasowang@redhat.com> - 2017-03-31 06:00 +0200
Re: [PATCH V2 net-next 1/7] ptr_ring: introduce batch dequeuing "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-31 16:40 +0200
Re: [PATCH V2 net-next 1/7] ptr_ring: introduce batch dequeuing Jason Wang <jasowang@redhat.com> - 2017-04-01 07:20 +0200
[PATCH V2 net-next 4/7] tap: export skb_array Jason Wang <jasowang@redhat.com> - 2017-03-30 09:30 +0200
[PATCH V2 net-next 3/7] tun: export skb_array Jason Wang <jasowang@redhat.com> - 2017-03-30 09:30 +0200
[PATCH V2 net-next 2/7] skb_array: introduce batch dequeuing Jason Wang <jasowang@redhat.com> - 2017-03-30 09:30 +0200
[PATCH V2 net-next 7/7] vhost_net: try batch dequing from skb array Jason Wang <jasowang@redhat.com> - 2017-03-30 09:30 +0200
Re: [PATCH V2 net-next 7/7] vhost_net: try batch dequing from skb array "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-30 16:30 +0200
Re: [PATCH V2 net-next 7/7] vhost_net: try batch dequing from skb array Jason Wang <jasowang@redhat.com> - 2017-03-31 06:10 +0200
Re: [PATCH V2 net-next 7/7] vhost_net: try batch dequing from skb array Jason Wang <jasowang@redhat.com> - 2017-03-31 08:50 +0200
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