[PATCH net-next 3/7] s390/qeth: pass TSO header length to fill_buffer()

Julian Wiedmann
2017-08-18T08:19:06Z

The TSO code already calculates the length of its header element,
no need to duplicate this in the low-level code again.

Use this opportunity to make hd_len unsigned, and for TSO match
its calculation to what tso_fill_header() does.

No functional change.

Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
---
drivers/s390/net/qeth_core.h | 7 ++++---
drivers/s390/net/qeth_core_main.c | 18 ++++++++----------
drivers/s390/net/qeth_l2_main.c | 4 ++--
drivers/s390/net/qeth_l3_main.c | 15 +++++++++------
4 files changed, 23 insertions(+), 21 deletions(-)

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 4a4ca5cb37a0..2f5673812810 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -949,9 +949,10 @@ int qeth_get_elements_for_frags(struct sk_buff *);
int qeth_do_send_packet_fast(struct qeth_card *card,
struct qeth_qdio_out_q *queue, struct sk_buff *skb,
struct qeth_hdr *hdr, unsigned int offset,
- int hd_len);
-int qeth_do_send_packet(struct qeth_card *, struct qeth_qdio_out_q *,
- struct sk_buff *, struct qeth_hdr *, int);
+ unsigned int hd_len);
+int qeth_do_send_packet(struct qeth_card *card, struct qeth_qdio_out_q *queue,
+ struct sk_buff *skb, struct qeth_hdr *hdr,
+ unsigned int hd_len, int elements);
int qeth_do_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
int qeth_core_get_sset_count(struct net_device *, int);
void qeth_core_get_ethtool_stats(struct net_device *,
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 415424e618ad..6cafeceea3ce 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -3956,11 +3956,11 @@ static void __qeth_fill_buffer(struct sk_buff *skb,
static int qeth_fill_buffer(struct qeth_qdio_out_q *queue,
struct qeth_qdio_out_buffer *buf,
struct sk_buff *skb, struct qeth_hdr *hdr,
- unsigned int offset, int hd_len)
+ unsigned int offset, unsigned int hd_len)
{
struct qdio_buffer *buffer;
- int flush_cnt = 0, hdr_len;
bool is_first_elem = true;
+ int flush_cnt = 0;

buffer = buf->buffer;
refcount_inc(&skb->users);
@@ -3970,14 +3970,12 @@ static int qeth_fill_buffer(struct qeth_qdio_out_q *queue,
int element = buf->next_element_to_fill;
is_first_elem = false;

- hdr_len = sizeof(struct qeth_hdr_tso) +
- ((struct qeth_hdr_tso *)hdr)->ext.dg_hdr_len;
/*fill first buffer entry only with header information */
buffer->element[element].addr = skb->data;
- buffer->element[element].length = hdr_len;
+ buffer->element[element].length = hd_len;
buffer->element[element].eflags = SBAL_EFLAGS_FIRST_FRAG;
buf->next_element_to_fill++;
- skb_pull(skb, hdr_len);
+ skb_pull(skb, hd_len);
}

/* IQD */
@@ -4020,7 +4018,7 @@ static int qeth_fill_buffer(struct qeth_qdio_out_q *queue,
int qeth_do_send_packet_fast(struct qeth_card *card,
struct qeth_qdio_out_q *queue, struct sk_buff *skb,
struct qeth_hdr *hdr, unsigned int offset,
- int hd_len)
+ unsigned int hd_len)
{
struct qeth_qdio_out_buffer *buffer;
int index;
@@ -4050,8 +4048,8 @@ int qeth_do_send_packet_fast(struct qeth_card *card,
EXPORT_SYMBOL_GPL(qeth_do_send_packet_fast);

int qeth_do_send_packet(struct qeth_card *card, struct qeth_qdio_out_q *queue,
- struct sk_buff *skb, struct qeth_hdr *hdr,
- int elements_needed)
+ struct sk_buff *skb, struct qeth_hdr *hdr,
+ unsigned int hd_len, int elements_needed)
{
struct qeth_qdio_out_buffer *buffer;
int start_index;
@@ -4100,7 +4098,7 @@ int qeth_do_send_packet(struct qeth_card *card, struct qeth_qdio_out_q *queue,
}
}
}
- tmp = qeth_fill_buffer(queue, buffer, skb, hdr, 0, 0);
+ tmp = qeth_fill_buffer(queue, buffer, skb, hdr, 0, hd_len);
queue->next_buf_to_fill = (queue->next_buf_to_fill + tmp) %
QDIO_MAX_BUFFERS_PER_Q;
flush_count += tmp;
diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index 3f5b852408d3..c78d9fadb9c8 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -746,7 +746,7 @@ static int qeth_l2_xmit_osa(struct qeth_card *card, struct sk_buff *skb,
rc = -EINVAL;
goto out;
}
- rc = qeth_do_send_packet(card, queue, skb_copy, hdr, elements);
+ rc = qeth_do_send_packet(card, queue, skb_copy, hdr, 0, elements);
out:
if (!rc) {
/* tx success, free dangling original */
@@ -778,7 +778,7 @@ static int qeth_l2_xmit_osn(struct qeth_card *card, struct sk_buff *skb,
return -E2BIG;
if (qeth_hdr_chk_and_bounce(skb, &hdr, sizeof(*hdr)))
return -EINVAL;
- return qeth_do_send_packet(card, queue, skb, hdr, elements);
+ return qeth_do_send_packet(card, queue, skb, hdr, 0, elements);
}

static netdev_tx_t qeth_l2_hard_start_xmit(struct sk_buff *skb,
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 0a3dc14a1381..fa8b638e3842 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -2637,6 +2637,7 @@ static netdev_tx_t qeth_l3_hard_start_xmit(struct sk_buff *skb,
qeth_get_priority_queue(card, skb, ipv, cast_type) :
card->qdio.default_out_queue];
int tx_bytes = skb->len;
+ unsigned int hd_len = 0;
bool use_tso;
int data_offset = -1;
unsigned int nr_frags;
@@ -2756,16 +2757,18 @@ static netdev_tx_t qeth_l3_hard_start_xmit(struct sk_buff *skb,

if (card->info.type != QETH_CARD_TYPE_IQD) {
int len;
- if (use_tso)
- len = ((unsigned long)tcp_hdr(new_skb) +
- tcp_hdrlen(new_skb)) -
- (unsigned long)new_skb->data;
- else
+ if (use_tso) {
+ hd_len = sizeof(struct qeth_hdr_tso) +
+ ip_hdrlen(new_skb) + tcp_hdrlen(new_skb);
+ len = hd_len;
+ } else {
len = sizeof(struct qeth_hdr_layer3);
+ }

if (qeth_hdr_chk_and_bounce(new_skb, &hdr, len))
goto tx_drop;
- rc = qeth_do_send_packet(card, queue, new_skb, hdr, elements);
+ rc = qeth_do_send_packet(card, queue, new_skb, hdr, hd_len,
+ elements);
} else
rc = qeth_do_send_packet_fast(card, queue, new_skb, hdr,
data_offset, 0);
--
2.11.2