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qeth: remove EDDP

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Performance measurements showed EDDP does not lower CPU costs but increase
them. So we dump out EDDP code from qeth driver.

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Frank Blaschka
2009-03-24 20:57:16 +00:00
committed by David S. Miller
parent f61a0d0538
commit 64ef895798
8 changed files with 111 additions and 980 deletions
Download Patch File Download Diff File Expand all files Collapse all files

123
drivers/s390/net/qeth_l3_main.c
View File

@@ -19,15 +19,15 @@
#include <linux/etherdevice.h>
#include <linux/mii.h>
#include <linux/ip.h>
#include <linux/reboot.h>
#include <linux/ipv6.h>
#include <linux/inetdevice.h>
#include <linux/igmp.h>
#include <net/ip.h>
#include <net/arp.h>
#include <net/ip6_checksum.h>
#include "qeth_l3.h"
#include "qeth_core_offl.h"
static int qeth_l3_set_offline(struct ccwgroup_device *);
static int qeth_l3_recover(void *);
@@ -2577,12 +2577,63 @@ static void qeth_l3_fill_header(struct qeth_card *card, struct qeth_hdr *hdr,
}
}
static void qeth_tso_fill_header(struct qeth_card *card,
struct qeth_hdr *qhdr, struct sk_buff *skb)
{
struct qeth_hdr_tso *hdr = (struct qeth_hdr_tso *)qhdr;
struct tcphdr *tcph = tcp_hdr(skb);
struct iphdr *iph = ip_hdr(skb);
struct ipv6hdr *ip6h = ipv6_hdr(skb);
/*fix header to TSO values ...*/
hdr->hdr.hdr.l3.id = QETH_HEADER_TYPE_TSO;
/*set values which are fix for the first approach ...*/
hdr->ext.hdr_tot_len = (__u16) sizeof(struct qeth_hdr_ext_tso);
hdr->ext.imb_hdr_no = 1;
hdr->ext.hdr_type = 1;
hdr->ext.hdr_version = 1;
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.payload_len = (__u16)(skb->len - hdr->ext.dg_hdr_len -
sizeof(struct qeth_hdr_tso));
tcph->check = 0;
if (skb->protocol == ETH_P_IPV6) {
ip6h->payload_len = 0;
tcph->check = ~csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
0, IPPROTO_TCP, 0);
} else {
/*OSA want us to set these values ...*/
tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
0, IPPROTO_TCP, 0);
iph->tot_len = 0;
iph->check = 0;
}
}
static void qeth_tx_csum(struct sk_buff *skb)
{
__wsum csum;
int offset;
skb_set_transport_header(skb, skb->csum_start - skb_headroom(skb));
offset = skb->csum_start - skb_headroom(skb);
BUG_ON(offset >= skb_headlen(skb));
csum = skb_checksum(skb, offset, skb->len - offset, 0);
offset += skb->csum_offset;
BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
*(__sum16 *)(skb->data + offset) = csum_fold(csum);
}
static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
int rc;
u16 *tag;
struct qeth_hdr *hdr = NULL;
int elements_needed = 0;
int elems;
struct qeth_card *card = dev->ml_priv;
struct sk_buff *new_skb = NULL;
int ipv = qeth_get_ip_version(skb);
@@ -2591,8 +2642,8 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
[qeth_get_priority_queue(card, skb, ipv, cast_type)];
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 nr_frags;
if ((card->info.type == QETH_CARD_TYPE_IQD) &&
(skb->protocol != htons(ETH_P_IPV6)) &&
@@ -2615,6 +2666,12 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (skb_is_gso(skb))
large_send = card->options.large_send;
else
if (skb->ip_summed == CHECKSUM_PARTIAL) {
qeth_tx_csum(skb);
if (card->options.performance_stats)
card->perf_stats.tx_csum++;
}
if ((card->info.type == QETH_CARD_TYPE_IQD) && (!large_send) &&
(skb_shinfo(skb)->nr_frags == 0)) {
@@ -2661,12 +2718,13 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
netif_stop_queue(dev);
/* 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
* chaining we can not send long frag lists
*/
if ((large_send == QETH_LARGE_SEND_TSO) &&
((skb_shinfo(new_skb)->nr_frags + 2) > 16))
large_send = QETH_LARGE_SEND_EDDP;
((skb_shinfo(new_skb)->nr_frags + 2) > 16)) {
if (skb_linearize(new_skb))
goto tx_drop;
}
if ((large_send == QETH_LARGE_SEND_TSO) &&
(cast_type == RTN_UNSPEC)) {
@@ -2689,40 +2747,22 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
}
}
if (large_send == QETH_LARGE_SEND_EDDP) {
/* new_skb is not owned by a socket so we use skb to get
* the protocol
*/
ctx = qeth_eddp_create_context(card, new_skb, hdr,
skb->sk->sk_protocol);
if (ctx == NULL) {
QETH_DBF_MESSAGE(2, "could not create eddp context\n");
goto tx_drop;
}
} else {
int elems = qeth_get_elements_no(card, (void *)hdr, new_skb,
elems = qeth_get_elements_no(card, (void *)hdr, new_skb,
elements_needed);
if (!elems) {
if (data_offset >= 0)
kmem_cache_free(qeth_core_header_cache, hdr);
goto tx_drop;
}
elements_needed += elems;
}
if ((large_send == QETH_LARGE_SEND_NO) &&
(new_skb->ip_summed == CHECKSUM_PARTIAL)) {
qeth_tx_csum(new_skb);
if (card->options.performance_stats)
card->perf_stats.tx_csum++;
if (!elems) {
if (data_offset >= 0)
kmem_cache_free(qeth_core_header_cache, hdr);
goto tx_drop;
}
elements_needed += elems;
nr_frags = skb_shinfo(new_skb)->nr_frags;
if (card->info.type != QETH_CARD_TYPE_IQD)
rc = qeth_do_send_packet(card, queue, new_skb, hdr,
elements_needed, ctx);
elements_needed);
else
rc = qeth_do_send_packet_fast(card, queue, new_skb, hdr,
elements_needed, ctx, data_offset, 0);
elements_needed, data_offset, 0);
if (!rc) {
card->stats.tx_packets++;
@@ -2734,22 +2774,13 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
card->perf_stats.large_send_bytes += tx_bytes;
card->perf_stats.large_send_cnt++;
}
if (skb_shinfo(new_skb)->nr_frags > 0) {
if (nr_frags) {
card->perf_stats.sg_skbs_sent++;
/* nr_frags + skb->data */
card->perf_stats.sg_frags_sent +=
skb_shinfo(new_skb)->nr_frags + 1;
card->perf_stats.sg_frags_sent += nr_frags + 1;
}
}
if (ctx != NULL) {
qeth_eddp_put_context(ctx);
dev_kfree_skb_any(new_skb);
}
} else {
if (ctx != NULL)
qeth_eddp_put_context(ctx);
if (data_offset >= 0)
kmem_cache_free(qeth_core_header_cache, hdr);
@@ -2844,7 +2875,7 @@ static int qeth_l3_ethtool_set_tso(struct net_device *dev, u32 data)
if (data) {
if (card->options.large_send == QETH_LARGE_SEND_NO) {
if (card->info.type == QETH_CARD_TYPE_IQD)
card->options.large_send = QETH_LARGE_SEND_EDDP;
return -EPERM;
else
card->options.large_send = QETH_LARGE_SEND_TSO;
dev->features |= NETIF_F_TSO;