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s390/qeth: clean up page frag creation

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Replace the open-coded skb_add_rx_frag(), and use a fall-through
to remove some duplicated code.

Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann 2017-10-18 17:40:21 +02:00 committed by David S. Miller
parent 9400c53f06
commit b6f72f9698
1 changed files with 11 additions and 20 deletions
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31
drivers/s390/net/qeth_core_main.c
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@ -5172,10 +5172,11 @@ EXPORT_SYMBOL_GPL(qeth_core_hardsetup_card);
static int qeth_create_skb_frag(struct qeth_qdio_buffer *qethbuffer,
struct qdio_buffer_element *element,
struct sk_buff **pskb, int offset, int *pfrag,
int data_len)
struct sk_buff **pskb, int offset, int data_len)
{
struct page *page = virt_to_page(element->addr);
unsigned int next_frag;
if (*pskb == NULL) {
if (qethbuffer->rx_skb) {
/* only if qeth_card.options.cq == QETH_CQ_ENABLED */
@ -5190,28 +5191,19 @@ static int qeth_create_skb_frag(struct qeth_qdio_buffer *qethbuffer,
skb_reserve(*pskb, ETH_HLEN);
if (data_len <= QETH_RX_PULL_LEN) {
skb_put_data(*pskb, element->addr + offset, data_len);
return 0;
} else {
get_page(page);
skb_put_data(*pskb, element->addr + offset,
QETH_RX_PULL_LEN);
skb_fill_page_desc(*pskb, *pfrag, page,
offset + QETH_RX_PULL_LEN,
data_len - QETH_RX_PULL_LEN);
(*pskb)->data_len += data_len - QETH_RX_PULL_LEN;
(*pskb)->len += data_len - QETH_RX_PULL_LEN;
(*pskb)->truesize += data_len - QETH_RX_PULL_LEN;
(*pfrag)++;
data_len -= QETH_RX_PULL_LEN;
offset += QETH_RX_PULL_LEN;
/* fall through to add page frag for remaining data */
}
} else {
get_page(page);
skb_fill_page_desc(*pskb, *pfrag, page, offset, data_len);
(*pskb)->data_len += data_len;
(*pskb)->len += data_len;
(*pskb)->truesize += data_len;
(*pfrag)++;
}
next_frag = skb_shinfo(*pskb)->nr_frags;
get_page(page);
skb_add_rx_frag(*pskb, next_frag, page, offset, data_len, data_len);
return 0;
}
@ -5234,7 +5226,6 @@ struct sk_buff *qeth_core_get_next_skb(struct qeth_card *card,
int data_len;
int headroom = 0;
int use_rx_sg = 0;
int frag = 0;
/* qeth_hdr must not cross element boundaries */
if (element->length < offset + sizeof(struct qeth_hdr)) {
@ -5286,7 +5277,7 @@ struct sk_buff *qeth_core_get_next_skb(struct qeth_card *card,
if (data_len) {
if (use_rx_sg) {
if (qeth_create_skb_frag(qethbuffer, element,
&skb, offset, &frag, data_len))
&skb, offset, data_len))
goto no_mem;
} else {
skb_put_data(skb, data_ptr, data_len);