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path: root/drivers/s390/net/qeth_l3_main.c
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Diffstat (limited to 'drivers/s390/net/qeth_l3_main.c')
-rw-r--r--drivers/s390/net/qeth_l3_main.c51
1 files changed, 38 insertions, 13 deletions
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 3e1d13857350..dd72c3c20165 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -2604,6 +2604,7 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
int tx_bytes = skb->len;
enum qeth_large_send_types large_send = QETH_LARGE_SEND_NO;
struct qeth_eddp_context *ctx = NULL;
+ int data_offset = -1;
if ((card->info.type == QETH_CARD_TYPE_IQD) &&
(skb->protocol != htons(ETH_P_IPV6)) &&
@@ -2624,14 +2625,28 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
card->perf_stats.outbound_start_time = qeth_get_micros();
}
- /* create a clone with writeable headroom */
- new_skb = skb_realloc_headroom(skb, sizeof(struct qeth_hdr_tso) +
- VLAN_HLEN);
- if (!new_skb)
- goto tx_drop;
+ if (skb_is_gso(skb))
+ large_send = card->options.large_send;
+
+ if ((card->info.type == QETH_CARD_TYPE_IQD) && (!large_send) &&
+ (skb_shinfo(skb)->nr_frags == 0)) {
+ new_skb = skb;
+ data_offset = ETH_HLEN;
+ hdr = kmem_cache_alloc(qeth_core_header_cache, GFP_ATOMIC);
+ if (!hdr)
+ goto tx_drop;
+ elements_needed++;
+ } else {
+ /* create a clone with writeable headroom */
+ new_skb = skb_realloc_headroom(skb, sizeof(struct qeth_hdr_tso)
+ + VLAN_HLEN);
+ if (!new_skb)
+ goto tx_drop;
+ }
if (card->info.type == QETH_CARD_TYPE_IQD) {
- skb_pull(new_skb, ETH_HLEN);
+ if (data_offset < 0)
+ skb_pull(new_skb, ETH_HLEN);
} else {
if (new_skb->protocol == htons(ETH_P_IP)) {
if (card->dev->type == ARPHRD_IEEE802_TR)
@@ -2657,9 +2672,6 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
netif_stop_queue(dev);
- if (skb_is_gso(new_skb))
- large_send = card->options.large_send;
-
/* fix hardware limitation: as long as we do not have sbal
* chaining we can not send long frag lists so we temporary
* switch to EDDP
@@ -2677,9 +2689,16 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
qeth_tso_fill_header(card, hdr, new_skb);
elements_needed++;
} else {
- hdr = (struct qeth_hdr *)skb_push(new_skb,
+ if (data_offset < 0) {
+ hdr = (struct qeth_hdr *)skb_push(new_skb,
sizeof(struct qeth_hdr));
- qeth_l3_fill_header(card, hdr, new_skb, ipv, cast_type);
+ qeth_l3_fill_header(card, hdr, new_skb, ipv,
+ cast_type);
+ } else {
+ qeth_l3_fill_header(card, hdr, new_skb, ipv,
+ cast_type);
+ hdr->hdr.l3.length = new_skb->len - data_offset;
+ }
}
if (large_send == QETH_LARGE_SEND_EDDP) {
@@ -2695,8 +2714,11 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
} else {
int elems = qeth_get_elements_no(card, (void *)hdr, new_skb,
elements_needed);
- if (!elems)
+ if (!elems) {
+ if (data_offset >= 0)
+ kmem_cache_free(qeth_core_header_cache, hdr);
goto tx_drop;
+ }
elements_needed += elems;
}
@@ -2709,7 +2731,7 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
elements_needed, ctx);
else
rc = qeth_do_send_packet_fast(card, queue, new_skb, hdr,
- elements_needed, ctx);
+ elements_needed, ctx, data_offset, 0);
if (!rc) {
card->stats.tx_packets++;
@@ -2737,6 +2759,9 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (ctx != NULL)
qeth_eddp_put_context(ctx);
+ if (data_offset >= 0)
+ kmem_cache_free(qeth_core_header_cache, hdr);
+
if (rc == -EBUSY) {
if (new_skb != skb)
dev_kfree_skb_any(new_skb);