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Date: Fri, 11 Nov 2011 18:37:15 +0530
From: Krishna Kumar <krkumar2@...ibm.com>
To: rusty@...tcorp.com.au, mst@...hat.com
Cc: netdev@...r.kernel.org, kvm@...r.kernel.org, davem@...emloft.net,
Krishna Kumar <krkumar2@...ibm.com>,
virtualization@...ts.linux-foundation.org
Subject: [RFC] [ver3 PATCH 6/6] virtio_net: Convert virtio_net driver to use find_vqs_irq
Convert virtio_net driver to use find_vqs_irq(). The TX vq's
share a single irq, while the RX vq's have individual irq's.
The skb_xmit_done handler also checks if any work is required.
Signed-off-by: krkumar2@...ibm.com
---
drivers/net/virtio_net.c | 29 ++++++++++++++++++++++-------
1 file changed, 22 insertions(+), 7 deletions(-)
diff -ruNp org/drivers/net/virtio_net.c new/drivers/net/virtio_net.c
--- org/drivers/net/virtio_net.c 2011-11-11 16:45:17.000000000 +0530
+++ new/drivers/net/virtio_net.c 2011-11-11 16:48:45.000000000 +0530
@@ -163,11 +163,13 @@ static void skb_xmit_done(struct virtque
struct virtnet_info *vi = vq->vdev->priv;
int qnum = vq->queue_index / 2; /* RX/TX vqs are allocated in pairs */
- /* Suppress further interrupts. */
- virtqueue_disable_cb(vq);
+ if (__netif_subqueue_stopped(vi->dev, qnum)) {
+ /* Suppress further interrupts. */
+ virtqueue_disable_cb(vq);
- /* We were probably waiting for more output buffers. */
- netif_wake_subqueue(vi->dev, qnum);
+ /* We were probably waiting for more output buffers. */
+ netif_wake_subqueue(vi->dev, qnum);
+ }
}
static void set_skb_frag(struct sk_buff *skb, struct page *page,
@@ -1120,6 +1122,7 @@ static void setup_cvq(struct virtnet_inf
static int invoke_find_vqs(struct virtnet_info *vi)
{
+ unsigned long *flags = NULL;
vq_callback_t **callbacks;
struct virtqueue **vqs;
int ret = -ENOMEM;
@@ -1141,6 +1144,14 @@ static int invoke_find_vqs(struct virtne
if (!vqs || !callbacks || !names)
goto err;
+ if (vi->num_queue_pairs > 1) {
+ int num = (total_vqs + BITS_PER_LONG - 1) / BITS_PER_LONG;
+
+ flags = kzalloc(num * sizeof(*flags), GFP_KERNEL);
+ if (!flags)
+ goto err;
+ }
+
/* Allocate/initialize parameters for recv virtqueues */
for (i = 0; i < vi->num_queue_pairs * 2; i += 2) {
callbacks[i] = skb_recv_done;
@@ -1155,6 +1166,8 @@ static int invoke_find_vqs(struct virtne
names[i] = kasprintf(GFP_KERNEL, "output.%d", i / 2);
if (!names[i])
goto err;
+ if (flags)
+ set_bit(i, flags);
}
/* Parameters for control virtqueue, if any */
@@ -1163,9 +1176,9 @@ static int invoke_find_vqs(struct virtne
names[i - 1] = "control";
}
- ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
- (const char **)names);
-
+ ret = vi->vdev->config->find_vqs_irq(vi->vdev, total_vqs, vqs,
+ callbacks, (const char **)names,
+ flags);
if (ret)
goto err;
@@ -1174,6 +1187,8 @@ static int invoke_find_vqs(struct virtne
setup_cvq(vi, vqs, vi->num_queue_pairs * 2);
err:
+ kfree(flags);
+
if (ret && names)
for (i = 0; i < vi->num_queue_pairs * 2; i++)
kfree(names[i]);
--
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