This patch switches to use shadow used ring API for RX. This will help
to hid used ring layout from device.
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
drivers/vhost/net.c | 37 +++++++++++--------------------------
1 file changed, 11 insertions(+), 26 deletions(-)
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 1a67f889cbc1..9e087d08b199 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -445,18 +445,6 @@ static int vhost_net_enable_vq(struct vhost_net *n,
return vhost_poll_start(poll, sock->file);
}
-static void vhost_net_signal_used(struct vhost_net_virtqueue *nvq)
-{
- struct vhost_virtqueue *vq = &nvq->vq;
- struct vhost_dev *dev = vq->dev;
-
- if (!nvq->done_idx)
- return;
-
- vhost_add_used_and_signal_n(dev, vq, vq->heads, nvq->done_idx);
- nvq->done_idx = 0;
-}
-
static void vhost_tx_batch(struct vhost_net *net,
struct vhost_net_virtqueue *nvq,
struct socket *sock,
@@ -999,7 +987,7 @@ static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk,
if (!len && rvq->busyloop_timeout) {
/* Flush batched heads first */
- vhost_net_signal_used(rnvq);
+ vhost_flush_shadow_used_and_signal(rvq);
/* Both tx vq and rx socket were polled here */
vhost_net_busy_poll(net, rvq, tvq, busyloop_intr, true);
@@ -1020,7 +1008,6 @@ static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk,
* returns number of buffer heads allocated, negative on error
*/
static int get_rx_bufs(struct vhost_virtqueue *vq,
- struct vring_used_elem *heads,
int datalen,
unsigned *iovcount,
struct vhost_log *log,
@@ -1063,11 +1050,11 @@ static int get_rx_bufs(struct vhost_virtqueue *vq,
nlogs += *log_num;
log += *log_num;
}
- heads[headcount].id = cpu_to_vhost32(vq, d);
len = iov_length(vq->iov + seg, in);
datalen -= len;
- heads[headcount].len = cpu_to_vhost32(vq,
- datalen >= 0 ? len : len + datalen);
+ vhost_add_shadow_used(vq, cpu_to_vhost32(vq, d),
+ cpu_to_vhost32(vq, datalen >= 0 ? len
+ : len + datalen));
++headcount;
seg += in;
}
@@ -1082,7 +1069,7 @@ static int get_rx_bufs(struct vhost_virtqueue *vq,
}
return headcount;
err:
- vhost_discard_vq_desc(vq, headcount);
+ vhost_discard_shadow_used(vq, headcount);
return r;
}
@@ -1141,8 +1128,7 @@ static void handle_rx(struct vhost_net *net)
break;
sock_len += sock_hlen;
vhost_len = sock_len + vhost_hlen;
- headcount = get_rx_bufs(vq, vq->heads + nvq->done_idx,
- vhost_len, &in, vq_log, &log,
+ headcount = get_rx_bufs(vq, vhost_len, &in, vq_log, &log,
likely(mergeable) ? UIO_MAXIOV : 1);
/* On error, stop handling until the next kick. */
if (unlikely(headcount < 0))
@@ -1189,7 +1175,7 @@ static void handle_rx(struct vhost_net *net)
if (unlikely(err != sock_len)) {
pr_debug("Discarded rx packet: "
" len %d, expected %zd\n", err, sock_len);
- vhost_discard_vq_desc(vq, headcount);
+ vhost_discard_shadow_used(vq, headcount);
continue;
}
/* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */
@@ -1213,12 +1199,11 @@ static void handle_rx(struct vhost_net *net)
copy_to_iter(&num_buffers, sizeof num_buffers,
&fixup) != sizeof num_buffers) {
vq_err(vq, "Failed num_buffers write");
- vhost_discard_vq_desc(vq, headcount);
+ vhost_discard_shadow_used(vq, headcount);
goto out;
}
- nvq->done_idx += headcount;
- if (nvq->done_idx > VHOST_NET_BATCH)
- vhost_net_signal_used(nvq);
+ if (vhost_get_shadow_used_count(vq) > VHOST_NET_BATCH)
+ vhost_flush_shadow_used_and_signal(vq);
if (unlikely(vq_log))
vhost_log_write(vq, vq_log, log, vhost_len,
vq->iov, in);
@@ -1230,7 +1215,7 @@ static void handle_rx(struct vhost_net *net)
else if (!sock_len)
vhost_net_enable_vq(net, vq);
out:
- vhost_net_signal_used(nvq);
+ vhost_flush_shadow_used_and_signal(vq);
mutex_unlock(&vq->mutex);
}
--
2.18.1
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