[PATCH net-next 4/7] s390/qeth: pass TSO data offset to fill_buffer()

Julian Wiedmann
2017-08-18T08:19:07Z

For TSO we need to skip the skb's qeth/IP/TCP headers when mapping
it into buffer elements. Instead of (mis)using skb_pull(), pass a
corresponding offset to fill_buffer() like we already do for IQDs.

No actual change in the resulting TSO buffers.

Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
---
drivers/s390/net/qeth_core.h | 2 +-
drivers/s390/net/qeth_core_main.c | 10 ++++------
drivers/s390/net/qeth_l2_main.c | 4 ++--
drivers/s390/net/qeth_l3_main.c | 2 +-
4 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 2f5673812810..5753fbc485d5 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -952,7 +952,7 @@ int qeth_do_send_packet_fast(struct qeth_card *card,
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);
+ unsigned int hd_len, unsigned int offset, 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 6cafeceea3ce..4a5c3028dfb6 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -3975,11 +3975,8 @@ static int qeth_fill_buffer(struct qeth_qdio_out_q *queue,
buffer->element[element].length = hd_len;
buffer->element[element].eflags = SBAL_EFLAGS_FIRST_FRAG;
buf->next_element_to_fill++;
- skb_pull(skb, hd_len);
- }
-
/* IQD */
- if (offset > 0) {
+ } else if (offset) {
int element = buf->next_element_to_fill;
is_first_elem = false;

@@ -4049,7 +4046,8 @@ 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,
- unsigned int hd_len, int elements_needed)
+ unsigned int offset, unsigned int hd_len,
+ int elements_needed)
{
struct qeth_qdio_out_buffer *buffer;
int start_index;
@@ -4098,7 +4096,7 @@ int qeth_do_send_packet(struct qeth_card *card, struct qeth_qdio_out_q *queue,
}
}
}
- tmp = qeth_fill_buffer(queue, buffer, skb, hdr, 0, hd_len);
+ tmp = qeth_fill_buffer(queue, buffer, skb, hdr, offset, 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 c78d9fadb9c8..a6233ab562f0 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, 0, elements);
+ rc = qeth_do_send_packet(card, queue, skb_copy, hdr, 0, 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, 0, elements);
+ return qeth_do_send_packet(card, queue, skb, hdr, 0, 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 fa8b638e3842..02400bbcb610 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -2768,7 +2768,7 @@ static netdev_tx_t qeth_l3_hard_start_xmit(struct sk_buff *skb,
if (qeth_hdr_chk_and_bounce(new_skb, &hdr, len))
goto tx_drop;
rc = qeth_do_send_packet(card, queue, new_skb, hdr, hd_len,
- elements);
+ hd_len, elements);
} else
rc = qeth_do_send_packet_fast(card, queue, new_skb, hdr,
data_offset, 0);
--
2.11.2