forked from Minki/linux
hyperv: Increase the buffer length for netvsc_channel_cb()
When the buffer is too small for a packet from VMBus, a bigger buffer will be allocated in netvsc_channel_cb() and retry reading the packet from VMBus. Increasing this buffer size will reduce the retry overhead. Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Reviewed-by: Dexuan Cui <decui@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -591,7 +591,7 @@ struct nvsp_message {
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#define NETVSC_RECEIVE_BUFFER_ID 0xcafe
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#define NETVSC_PACKET_SIZE 2048
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#define NETVSC_PACKET_SIZE 4096
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#define VRSS_SEND_TAB_SIZE 16
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@ -642,7 +642,7 @@ struct netvsc_device {
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int ring_size;
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/* The primary channel callback buffer */
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unsigned char cb_buffer[NETVSC_PACKET_SIZE];
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unsigned char *cb_buffer;
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/* The sub channel callback buffer */
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unsigned char *sub_cb_buf;
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};
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@ -42,6 +42,12 @@ static struct netvsc_device *alloc_net_device(struct hv_device *device)
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if (!net_device)
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return NULL;
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net_device->cb_buffer = kzalloc(NETVSC_PACKET_SIZE, GFP_KERNEL);
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if (!net_device->cb_buffer) {
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kfree(net_device);
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return NULL;
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}
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init_waitqueue_head(&net_device->wait_drain);
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net_device->start_remove = false;
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net_device->destroy = false;
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@ -52,6 +58,12 @@ static struct netvsc_device *alloc_net_device(struct hv_device *device)
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return net_device;
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}
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static void free_netvsc_device(struct netvsc_device *nvdev)
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{
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kfree(nvdev->cb_buffer);
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kfree(nvdev);
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}
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static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
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{
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struct netvsc_device *net_device;
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@ -551,7 +563,7 @@ int netvsc_device_remove(struct hv_device *device)
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if (net_device->sub_cb_buf)
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vfree(net_device->sub_cb_buf);
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kfree(net_device);
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free_netvsc_device(net_device);
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return 0;
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}
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@ -1093,7 +1105,7 @@ close:
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vmbus_close(device->channel);
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cleanup:
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kfree(net_device);
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free_netvsc_device(net_device);
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return ret;
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}
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