[PATCH net-next 07/12] s390/qeth: make more use of skb API

Julian Wiedmann
2017-08-15T15:02:45Z

Replace some open-coded parts with their proper API calls.

Also remove two skb_[re]set_mac_header() calls in the L2
xmit paths that are clearly no longer required, since at least
commit 6d1ccff62780 ("net: reset mac header in dev_start_xmit()").

Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Acked-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
---
drivers/s390/net/qeth_core.h | 5 -----
drivers/s390/net/qeth_core_main.c | 12 +++++-------
drivers/s390/net/qeth_l2_main.c | 7 +++----
drivers/s390/net/qeth_l3_main.c | 4 ++--
4 files changed, 10 insertions(+), 18 deletions(-)

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 95266449a50a..4a4ca5cb37a0 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -857,11 +857,6 @@ static inline int qeth_get_ip_version(struct sk_buff *skb)
}
}

-static inline int qeth_get_ip_protocol(struct sk_buff *skb)
-{
- return ip_hdr(skb)->protocol;
-}
-
static inline void qeth_put_buffer_pool_entry(struct qeth_card *card,
struct qeth_buffer_pool_entry *entry)
{
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 394bee93b891..6286a8e35924 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -3897,7 +3897,6 @@ static inline void __qeth_fill_buffer(struct sk_buff *skb,
int length = skb_headlen(skb) - offset;
char *data = skb->data + offset;
int length_here, cnt;
- struct skb_frag_struct *frag;

/* map linear part into buffer element(s) */
while (length > 0) {
@@ -3927,10 +3926,10 @@ static inline void __qeth_fill_buffer(struct sk_buff *skb,

/* map page frags into buffer element(s) */
for (cnt = 0; cnt < skb_shinfo(skb)->nr_frags; cnt++) {
- frag = &skb_shinfo(skb)->frags[cnt];
- data = (char *)page_to_phys(skb_frag_page(frag)) +
- frag->page_offset;
- length = frag->size;
+ skb_frag_t *frag = &skb_shinfo(skb)->frags[cnt];
+
+ data = skb_frag_address(frag);
+ length = skb_frag_size(frag);
while (length > 0) {
length_here = PAGE_SIZE -
((unsigned long) data % PAGE_SIZE);
@@ -3976,8 +3975,7 @@ static inline int qeth_fill_buffer(struct qeth_qdio_out_q *queue,
buffer->element[element].length = hdr_len;
buffer->element[element].eflags = SBAL_EFLAGS_FIRST_FRAG;
buf->next_element_to_fill++;
- skb->data += hdr_len;
- skb->len -= hdr_len;
+ skb_pull(skb, hdr_len);
}

/* IQD */
diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index a6ba897ed707..9c789ad6831a 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -752,11 +752,11 @@ static netdev_tx_t qeth_l2_hard_start_xmit(struct sk_buff *skb,
if (!hdr)
goto tx_drop;
elements_needed++;
- skb_reset_mac_header(new_skb);
qeth_l2_fill_header(card, hdr, new_skb, cast_type);
hdr->hdr.l2.pkt_length = new_skb->len;
- memcpy(((char *)hdr) + sizeof(struct qeth_hdr),
- skb_mac_header(new_skb), ETH_HLEN);
+ skb_copy_from_linear_data(new_skb,
+ ((char *)hdr) + sizeof(*hdr),
+ ETH_HLEN);
} else {
/* create a clone with writeable headroom */
new_skb = skb_realloc_headroom(skb,
@@ -764,7 +764,6 @@ static netdev_tx_t qeth_l2_hard_start_xmit(struct sk_buff *skb,
if (!new_skb)
goto tx_drop;
hdr = skb_push(new_skb, sizeof(struct qeth_hdr));
- skb_set_mac_header(new_skb, sizeof(struct qeth_hdr));
qeth_l2_fill_header(card, hdr, new_skb, cast_type);
if (new_skb->ip_summed == CHECKSUM_PARTIAL)
qeth_l2_hdr_csum(card, hdr, new_skb);
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 13124e6fd9d3..97ca8a6cbb21 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -2570,7 +2570,7 @@ static void qeth_tso_fill_header(struct qeth_card *card,
hdr->ext.hdr_len = 28;
/*insert non-fix values */
hdr->ext.mss = skb_shinfo(skb)->gso_size;
- hdr->ext.dg_hdr_len = (__u16)(iph->ihl*4 + tcph->doff*4);
+ hdr->ext.dg_hdr_len = (__u16)(ip_hdrlen(skb) + tcp_hdrlen(skb));
hdr->ext.payload_len = (__u16)(skb->len - hdr->ext.dg_hdr_len -
sizeof(struct qeth_hdr_tso));
tcph->check = 0;
@@ -2663,7 +2663,7 @@ static netdev_tx_t qeth_l3_hard_start_xmit(struct sk_buff *skb,

/* Ignore segment size from skb_is_gso(), 1 page is always used. */
use_tso = skb_is_gso(skb) &&
- (qeth_get_ip_protocol(skb) == IPPROTO_TCP) && (ipv == 4);
+ (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4);

if (card->info.type == QETH_CARD_TYPE_IQD) {
new_skb = skb;
--
2.11.2