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[S390] qeth: preallocated qeth header for hiper socket

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For hiper socket devices this patch will economize the reallocation
of the tx skb data segment by allocating separate memory for the qdio
transport information (qeth header).

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Frank Blaschka
2008-08-01 16:39:13 +02:00
committed by Martin Schwidefsky
parent a4b526b3ba
commit 683d718a89
4 changed files with 126 additions and 39 deletions
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50
drivers/s390/net/qeth_l2_main.c
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@@ -243,8 +243,7 @@ static void qeth_l2_get_packet_type(struct qeth_card *card,
static void qeth_l2_fill_header(struct qeth_card *card, struct qeth_hdr *hdr,
struct sk_buff *skb, int ipv, int cast_type)
{
struct vlan_ethhdr *veth = (struct vlan_ethhdr *)((skb->data) +
QETH_HEADER_SIZE);
struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb_mac_header(skb);
memset(hdr, 0, sizeof(struct qeth_hdr));
hdr->hdr.l2.id = QETH_HEADER_TYPE_LAYER2;
@@ -621,6 +620,9 @@ static int qeth_l2_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;
int elements_needed = 0;
int hd_len = 0;
if ((card->state != CARD_STATE_UP) || !card->lan_online) {
card->stats.tx_carrier_errors++;
@@ -643,13 +645,32 @@ static int qeth_l2_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (card->info.type == QETH_CARD_TYPE_OSN)
hdr = (struct qeth_hdr *)skb->data;
else {
/* create a clone with writeable headroom */
new_skb = skb_realloc_headroom(skb, sizeof(struct qeth_hdr));
if (!new_skb)
goto tx_drop;
hdr = (struct qeth_hdr *)skb_push(new_skb,
if ((card->info.type == QETH_CARD_TYPE_IQD) && (!large_send) &&
(skb_shinfo(skb)->nr_frags == 0)) {
new_skb = skb;
data_offset = ETH_HLEN;
hd_len = ETH_HLEN;
hdr = kmem_cache_alloc(qeth_core_header_cache,
GFP_ATOMIC);
if (!hdr)
goto tx_drop;
elements_needed++;
skb_reset_mac_header(new_skb);
qeth_l2_fill_header(card, hdr, new_skb, ipv, cast_type);
hdr->hdr.l2.pkt_length = new_skb->len;
memcpy(((char *)hdr) + sizeof(struct qeth_hdr),
skb_mac_header(new_skb), ETH_HLEN);
} else {
/* create a clone with writeable headroom */
new_skb = skb_realloc_headroom(skb,
sizeof(struct qeth_hdr));
qeth_l2_fill_header(card, hdr, new_skb, ipv, cast_type);
if (!new_skb)
goto tx_drop;
hdr = (struct qeth_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, ipv, cast_type);
}
}
if (large_send == QETH_LARGE_SEND_EDDP) {
@@ -660,9 +681,13 @@ static int qeth_l2_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
goto tx_drop;
}
} else {
elements = qeth_get_elements_no(card, (void *)hdr, new_skb, 0);
if (!elements)
elements = qeth_get_elements_no(card, (void *)hdr, new_skb,
elements_needed);
if (!elements) {
if (data_offset >= 0)
kmem_cache_free(qeth_core_header_cache, hdr);
goto tx_drop;
}
}
if ((large_send == QETH_LARGE_SEND_NO) &&
@@ -674,7 +699,7 @@ static int qeth_l2_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
elements, ctx);
else
rc = qeth_do_send_packet_fast(card, queue, new_skb, hdr,
elements, ctx);
elements, ctx, data_offset, hd_len);
if (!rc) {
card->stats.tx_packets++;
card->stats.tx_bytes += tx_bytes;
@@ -701,6 +726,9 @@ static int qeth_l2_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);