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net: cdc_ncm: reduce skb truesize in rx path 

Cloning the big skbs we use for USB buffering chokes up TCP and
SCTP because the socket memory limits are hitting earlier than
they should. It is better to unconditionally copy the unwrapped
packets to freshly allocated skbs.

Reported-by: Jim Baxter <jim_baxter@mentor.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bjørn Mork 2014-05-30 09:31:03 +02:00 committed by David S. Miller
parent e289fd2817
commit 1e2c611723
1 changed files with 3 additions and 4 deletions
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7
drivers/net/usb/cdc_ncm.c
View File

@ -1289,12 +1289,11 @@ next_ndp:
break;
} else {
skb = skb_clone(skb_in, GFP_ATOMIC);
/* create a fresh copy to reduce truesize */
skb = netdev_alloc_skb_ip_align(dev->net, len);
if (!skb)
goto error;
skb->len = len;
skb->data = ((u8 *)skb_in->data) + offset;
skb_set_tail_pointer(skb, len);
memcpy(skb_put(skb, len), skb_in->data + offset, len);
usbnet_skb_return(dev, skb);
payload += len; /* count payload bytes in this NTB */
}