net/usbnet: reserve headroom on rx skbs
network drivers should reserve some headroom on incoming skbs so that we dont need expensive reallocations, eg forwarding packets in tunnels. This NET_SKB_PAD padding is done in various helpers, like __netdev_alloc_skb_ip_align() in this patch, combining NET_SKB_PAD and NET_IP_ALIGN magic. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Oliver Neukum <oneukum@suse.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Oliver Neukum <oneukum@suse.de> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -328,13 +328,13 @@ static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
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unsigned long lockflags;
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size_t size = dev->rx_urb_size;
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if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {
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skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
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if (!skb) {
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netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
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usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
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usb_free_urb (urb);
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return -ENOMEM;
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}
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skb_reserve (skb, NET_IP_ALIGN);
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entry = (struct skb_data *) skb->cb;
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entry->urb = urb;
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