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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

2
drivers/atm/fore200e.c
View file

@ -1104,7 +1104,7 @@ fore200e_push_rpd(struct fore200e* fore200e, struct atm_vcc* vcc, struct rpd* rp
/* Make device DMA transfer visible to CPU. */
fore200e->bus->dma_sync_for_cpu(fore200e, buffer->data.dma_addr, rpd->rsd[ i ].length, DMA_FROM_DEVICE);
memcpy(skb_put(skb, rpd->rsd[ i ].length), buffer->data.align_addr, rpd->rsd[ i ].length);
skb_put_data(skb, buffer->data.align_addr, rpd->rsd[i].length);
/* Now let the device get at it again. */
fore200e->bus->dma_sync_for_device(fore200e, buffer->data.dma_addr, rpd->rsd[ i ].length, DMA_FROM_DEVICE);

2
drivers/atm/he.c
View file

@ -1735,7 +1735,7 @@ he_service_rbrq(struct he_dev *he_dev, int group)
__net_timestamp(skb);
list_for_each_entry(heb, &he_vcc->buffers, entry)
memcpy(skb_put(skb, heb->len), &heb->data, heb->len);
skb_put_data(skb, &heb->data, heb->len);
switch (vcc->qos.aal) {
case ATM_AAL0:

11
drivers/atm/idt77252.c
View file

@ -1090,8 +1090,7 @@ dequeue_rx(struct idt77252_dev *card, struct rsq_entry *rsqe)
*((u32 *) sb->data) = aal0;
skb_put(sb, sizeof(u32));
memcpy(skb_put(sb, ATM_CELL_PAYLOAD),
cell, ATM_CELL_PAYLOAD);
skb_put_data(sb, cell, ATM_CELL_PAYLOAD);
ATM_SKB(sb)->vcc = vcc;
__net_timestamp(sb);
@ -1159,8 +1158,7 @@ dequeue_rx(struct idt77252_dev *card, struct rsq_entry *rsqe)
return;
}
skb_queue_walk(&rpp->queue, sb)
memcpy(skb_put(skb, sb->len),
sb->data, sb->len);
skb_put_data(skb, sb->data, sb->len);
recycle_rx_pool_skb(card, rpp);
@ -1322,8 +1320,7 @@ idt77252_rx_raw(struct idt77252_dev *card)
*((u32 *) sb->data) = header;
skb_put(sb, sizeof(u32));
memcpy(skb_put(sb, ATM_CELL_PAYLOAD), &(queue->data[16]),
ATM_CELL_PAYLOAD);
skb_put_data(sb, &(queue->data[16]), ATM_CELL_PAYLOAD);
ATM_SKB(sb)->vcc = vcc;
__net_timestamp(sb);
@ -2014,7 +2011,7 @@ idt77252_send_oam(struct atm_vcc *vcc, void *cell, int flags)
}
atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
memcpy(skb_put(skb, 52), cell, 52);
skb_put_data(skb, cell, 52);
return idt77252_send_skb(vcc, skb, 1);
}

2
drivers/atm/solos-pci.c
View file

@ -493,7 +493,7 @@ static int send_command(struct solos_card *card, int dev, const char *buf, size_
header->vci = cpu_to_le16(0);
header->type = cpu_to_le16(PKT_COMMAND);
memcpy(skb_put(skb, size), buf, size);
skb_put_data(skb, buf, size);
fpga_queue(card, dev, skb, NULL);