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authorHaiyang Zhang <haiyangz@microsoft.com>2011-12-02 23:56:25 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2011-12-10 04:26:50 +0400
commit1d06825b0ede541f63b5577435abd2fc649a9b5e (patch)
treef3b72c945f340d1f6e81ec124a8fb352d9de747f /drivers/net/hyperv/netvsc_drv.c
parent9d41c5bb07ad97b7777283d7922292f456ba4bfd (diff)
downloadlinux-1d06825b0ede541f63b5577435abd2fc649a9b5e.tar.xz
net/hyperv: Fix the stop/wake queue mechanism
The ring buffer is only used to pass meta data for outbound packets. The actual payload is accessed by DMA from the host. So the stop/wake queue mechanism based on counting and comparing number of pages sent v.s. number of pages in the ring buffer is wrong. Also, there is a race condition in the stop/wake queue calls, which can stop xmit queue forever. The new stop/wake queue mechanism is based on the actual bytes used by outbound packets in the ring buffer. The check for number of outstanding sends after stop queue prevents the race condition that can cause wake queue happening earlier than stop queue. Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reported-by: Long Li <longli@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/net/hyperv/netvsc_drv.c')
-rw-r--r--drivers/net/hyperv/netvsc_drv.c24
1 files changed, 1 insertions, 23 deletions
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index b69c3a4d1e9e..7da85ebd7ac6 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -43,15 +43,10 @@
struct net_device_context {
/* point back to our device context */
struct hv_device *device_ctx;
- atomic_t avail;
struct delayed_work dwork;
};
-#define PACKET_PAGES_LOWATER 8
-/* Need this many pages to handle worst case fragmented packet */
-#define PACKET_PAGES_HIWATER (MAX_SKB_FRAGS + 2)
-
static int ring_size = 128;
module_param(ring_size, int, S_IRUGO);
MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
@@ -144,18 +139,8 @@ static void netvsc_xmit_completion(void *context)
kfree(packet);
- if (skb) {
- struct net_device *net = skb->dev;
- struct net_device_context *net_device_ctx = netdev_priv(net);
- unsigned int num_pages = skb_shinfo(skb)->nr_frags + 2;
-
+ if (skb)
dev_kfree_skb_any(skb);
-
- atomic_add(num_pages, &net_device_ctx->avail);
- if (atomic_read(&net_device_ctx->avail) >=
- PACKET_PAGES_HIWATER)
- netif_wake_queue(net);
- }
}
static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
@@ -167,8 +152,6 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
/* Add 1 for skb->data and additional one for RNDIS */
num_pages = skb_shinfo(skb)->nr_frags + 1 + 1;
- if (num_pages > atomic_read(&net_device_ctx->avail))
- return NETDEV_TX_BUSY;
/* Allocate a netvsc packet based on # of frags. */
packet = kzalloc(sizeof(struct hv_netvsc_packet) +
@@ -218,10 +201,6 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
if (ret == 0) {
net->stats.tx_bytes += skb->len;
net->stats.tx_packets++;
-
- atomic_sub(num_pages, &net_device_ctx->avail);
- if (atomic_read(&net_device_ctx->avail) < PACKET_PAGES_LOWATER)
- netif_stop_queue(net);
} else {
/* we are shutting down or bus overloaded, just drop packet */
net->stats.tx_dropped++;
@@ -391,7 +370,6 @@ static int netvsc_probe(struct hv_device *dev,
net_device_ctx = netdev_priv(net);
net_device_ctx->device_ctx = dev;
- atomic_set(&net_device_ctx->avail, ring_size);
hv_set_drvdata(dev, net);
INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_send_garp);