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networking: introduce and use skb_put_data()

Browse source 
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 <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Johannes Berg 2017-06-16 14:29:20 +02:00 • committed by David S. Miller
commit 59ae1d127a
252 changed files with 622 additions and 741 deletions
Download patch file Download diff file Expand all files Collapse all files

7
net/ieee802154/6lowpan/tx.c
View file

@ -121,8 +121,7 @@ lowpan_alloc_frag(struct sk_buff *skb, int size,
*mac_cb(frag) = *mac_cb(skb);
if (frag1) {
memcpy(skb_put(frag, skb->mac_len),
skb_mac_header(skb), skb->mac_len);
skb_put_data(frag, skb_mac_header(skb), skb->mac_len);
} else {
rc = wpan_dev_hard_header(frag, wdev,
&master_hdr->dest,
@ -152,8 +151,8 @@ lowpan_xmit_fragment(struct sk_buff *skb, const struct ieee802154_hdr *wpan_hdr,
if (IS_ERR(frag))
return PTR_ERR(frag);
memcpy(skb_put(frag, frag_hdrlen), frag_hdr, frag_hdrlen);
memcpy(skb_put(frag, len), skb_network_header(skb) + offset, len);
skb_put_data(frag, frag_hdr, frag_hdrlen);
skb_put_data(frag, skb_network_header(skb) + offset, len);
raw_dump_table(__func__, " fragment dump", frag->data, frag->len);