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Commit 7bdd4027 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
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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: default avatarEric Dumazet <eric.dumazet@gmail.com>
Cc: Oliver Neukum <oneukum@suse.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: default avatarOliver Neukum <oneukum@suse.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c0ea452e

drivers/net/usb/usbnet.c

+2 −2
Original line number Diff line number Diff line
@@ -328,13 +328,13 @@ static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 
	unsigned long		lockflags;

	size_t			size = dev->rx_urb_size;



	if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {

	skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);

	if (!skb) {

		netif_dbg(dev, rx_err, dev->net, "no rx skb\n");

		usbnet_defer_kevent (dev, EVENT_RX_MEMORY);

		usb_free_urb (urb);

		return -ENOMEM;

	}

	skb_reserve (skb, NET_IP_ALIGN);



	entry = (struct skb_data *) skb->cb;

	entry->urb = urb;