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net/usbnet: reserve headroom on rx skbs

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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>
This commit is contained in:
Eric Dumazet 2012-03-14 06:56:25 +00:00 • committed by David S. Miller
parent c0ea452e42
commit 7bdd402706
1 changed files with 2 additions and 2 deletions
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4
drivers/net/usb/usbnet.c
View file

@ -328,13 +328,13 @@ static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
unsigned long lockflags; unsigned long lockflags;
size_t size = dev->rx_urb_size; 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"); netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
usbnet_defer_kevent (dev, EVENT_RX_MEMORY); usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
usb_free_urb (urb); usb_free_urb (urb);
return -ENOMEM; return -ENOMEM;
} }
skb_reserve (skb, NET_IP_ALIGN);
entry = (struct skb_data *) skb->cb; entry = (struct skb_data *) skb->cb;
entry->urb = urb; entry->urb = urb;