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ftgmac100: fix skb truesize underestimation 

ftgmac100 allocates a page per skb fragment. We must account
PAGE_SIZE increments on skb->truesize, not the actual frag length.

If frame is under 64 bytes, page is freed, and truesize adjusted.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Po-Yu Chuang <ratbert@faraday-tech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2011-10-13 11:30:52 +00:00 committed by David S. Miller
parent 7ae60b3f3b
commit 5935f81c59
1 changed files with 3 additions and 1 deletions
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4
drivers/net/ethernet/faraday/ftgmac100.c
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@ -467,7 +467,7 @@ static bool ftgmac100_rx_packet(struct ftgmac100 *priv, int *processed)
skb->len += size;
skb->data_len += size;
skb->truesize += size;
skb->truesize += PAGE_SIZE;
if (ftgmac100_rxdes_last_segment(rxdes))
done = true;
@ -478,6 +478,8 @@ static bool ftgmac100_rx_packet(struct ftgmac100 *priv, int *processed)
rxdes = ftgmac100_current_rxdes(priv);
} while (!done);
if (skb->len <= 64)
skb->truesize -= PAGE_SIZE;
__pskb_pull_tail(skb, min(skb->len, 64U));
skb->protocol = eth_type_trans(skb, netdev);