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networking: introduce and use skb_put_data()

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A common pattern with skb_put() is to just want to memcpy()
some data into the new space, introduce skb_put_data() for
this.

An spatch similar to the one for skb_put_zero() converts many
of the places using it:

    @@
    identifier p, p2;
    expression len, skb, data;
    type t, t2;
    @@
    (
    -p = skb_put(skb, len);
    +p = skb_put_data(skb, data, len);
    |
    -p = (t)skb_put(skb, len);
    +p = skb_put_data(skb, data, len);
    )
    (
    p2 = (t2)p;
    -memcpy(p2, data, len);
    |
    -memcpy(p, data, len);
    )

    @@
    type t, t2;
    identifier p, p2;
    expression skb, data;
    @@
    t *p;
    ...
    (
    -p = skb_put(skb, sizeof(t));
    +p = skb_put_data(skb, data, sizeof(t));
    |
    -p = (t *)skb_put(skb, sizeof(t));
    +p = skb_put_data(skb, data, sizeof(t));
    )
    (
    p2 = (t2)p;
    -memcpy(p2, data, sizeof(*p));
    |
    -memcpy(p, data, sizeof(*p));
    )

    @@
    expression skb, len, data;
    @@
    -memcpy(skb_put(skb, len), data, len);
    +skb_put_data(skb, data, len);

(again, manually post-processed to retain some comments)

Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg
2017-06-16 14:29:20 +02:00
committed by David S. Miller
parent b080db5853
commit 59ae1d127a
252 changed files with 622 additions and 741 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/ethernet/dec/tulip/de4x5.c
View File

@@ -3624,10 +3624,10 @@ de4x5_alloc_rx_buff(struct net_device *dev, int index, int len)
skb_reserve(p, 2); /* Align */
if (index < lp->rx_old) { /* Wrapped buffer */
short tlen = (lp->rxRingSize - lp->rx_old) * RX_BUFF_SZ;
memcpy(skb_put(p,tlen),lp->rx_bufs + lp->rx_old * RX_BUFF_SZ,tlen);
memcpy(skb_put(p,len-tlen),lp->rx_bufs,len-tlen);
skb_put_data(p, lp->rx_bufs + lp->rx_old * RX_BUFF_SZ, tlen);
skb_put_data(p, lp->rx_bufs, len - tlen);
} else { /* Linear buffer */
memcpy(skb_put(p,len),lp->rx_bufs + lp->rx_old * RX_BUFF_SZ,len);
skb_put_data(p, lp->rx_bufs + lp->rx_old * RX_BUFF_SZ, len);
}
return p;