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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2012-03-14 06:56:25 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-03-16 02:01:05 -0700 |
| commit | 7bdd402706cf26bfef9050dfee3f229b7f33ee4f (patch) | |
| tree | 4db4fac193e40f7a7d86a3ec072337b451af3477 /drivers | |
| parent | c0ea452e422a1fc78ec8c639df64012d0b8dbb4a (diff) | |
| download | lwn-7bdd402706cf26bfef9050dfee3f229b7f33ee4f.tar.gz lwn-7bdd402706cf26bfef9050dfee3f229b7f33ee4f.zip | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/usb/usbnet.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index 81b96e303757..59681f01a54e 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -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; |