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usb: gadget: NCM: Stop RX TCP Bursts getting dropped. 

This fixes a problem with dropped packets over 16k CDC-NCM
when the connection is being heavily used.

The issue was that the extracted frames cloned from the
received frame were consuming more memory than necessary
resulting in the truesize being ~32KB instead of ~2KB, this
meant there was a high chance of reaching the sk_rcvbuf
limit.

Signed-off-by: Jim Baxter <jim_baxter@mentor.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Jim Baxter 2014-07-07 18:33:19 +01:00 committed by Felipe Balbi
parent 6d3865f9d4
commit 66847062a6
1 changed files with 8 additions and 7 deletions
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15
drivers/usb/gadget/f_ncm.c
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@ -1229,16 +1229,17 @@ static int ncm_unwrap_ntb(struct gether *port,
index2 = get_ncm(&tmp, opts->dgram_item_len);
dg_len2 = get_ncm(&tmp, opts->dgram_item_len);
skb2 = skb_clone(skb, GFP_ATOMIC);
/*
* Copy the data into a new skb.
* This ensures the truesize is correct
*/
skb2 = netdev_alloc_skb_ip_align(ncm->netdev,
dg_len - crc_len);
if (skb2 == NULL)
goto err;
memcpy(skb_put(skb2, dg_len - crc_len),
skb->data + index, dg_len - crc_len);
if (!skb_pull(skb2, index)) {
ret = -EOVERFLOW;
goto err;
}
skb_trim(skb2, dg_len - crc_len);
skb_queue_tail(list, skb2);
ndp_len -= 2 * (opts->dgram_item_len * 2);