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qeth: clean up condition when tso is used

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Make conditions under which TSO is activated more stringent.
Make calculation of SBALEs required for the skb more accurate.

Signed-off-by: Eugene Crosser <Eugene.Crosser@ru.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eugene Crosser 2016-06-16 16:18:53 +02:00 committed by David S. Miller
parent 2863c61334
commit 41aeed58af
2 changed files with 30 additions and 20 deletions
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6
drivers/s390/net/qeth_core.h
View File

@ -19,6 +19,7 @@
#include <linux/seq_file.h>
#include <linux/ethtool.h>
#include <linux/hashtable.h>
#include <linux/ip.h>
#include <net/ipv6.h>
#include <net/if_inet6.h>
@ -878,6 +879,11 @@ static inline int qeth_get_ip_version(struct sk_buff *skb)
}
}
static inline int qeth_get_ip_protocol(struct sk_buff *skb)
{
return ip_hdr(skb)->protocol;
}
static inline void qeth_put_buffer_pool_entry(struct qeth_card *card,
struct qeth_buffer_pool_entry *entry)
{

44
drivers/s390/net/qeth_l3_main.c
View File

@ -2794,10 +2794,10 @@ static void qeth_tso_fill_header(struct qeth_card *card,
}
/**
* qeth_get_elements_no_tso() - find number of SBALEs for skb data, inc. frags.
* @card: qeth card structure, to check max. elems.
* @skb: SKB address
* @extra_elems: extra elems needed, to check against max.
* qeth_l3_get_elements_no_tso() - find number of SBALEs for skb data for tso
* @card: qeth card structure, to check max. elems.
* @skb: SKB address
* @extra_elems: extra elems needed, to check against max.
*
* Returns the number of pages, and thus QDIO buffer elements, needed to cover
* skb data, including linear part and fragments, but excluding TCP header.
@ -2806,7 +2806,7 @@ static void qeth_tso_fill_header(struct qeth_card *card,
* Returns 0 if it does not.
* Note: extra_elems is not included in the returned result.
*/
static int qeth_get_elements_no_tso(struct qeth_card *card,
static int qeth_l3_get_elements_no_tso(struct qeth_card *card,
struct sk_buff *skb, int extra_elems)
{
addr_t tcpdptr = (addr_t)tcp_hdr(skb) + tcp_hdrlen(skb);
@ -2841,7 +2841,7 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
qeth_get_priority_queue(card, skb, ipv, cast_type) :
card->qdio.default_out_queue];
int tx_bytes = skb->len;
bool large_send;
bool use_tso;
int data_offset = -1;
int nr_frags;
@ -2866,10 +2866,12 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
card->perf_stats.outbound_start_time = qeth_get_micros();
}
large_send = skb_is_gso(skb);
/* Ignore segment size from skb_is_gso(), 1 page is always used. */
use_tso = skb_is_gso(skb) &&
(qeth_get_ip_protocol(skb) == IPPROTO_TCP) && (ipv == 4);
if ((card->info.type == QETH_CARD_TYPE_IQD) && (!large_send) &&
(skb_shinfo(skb)->nr_frags == 0)) {
if ((card->info.type == QETH_CARD_TYPE_IQD) &&
!skb_is_nonlinear(skb)) {
new_skb = skb;
if (new_skb->protocol == ETH_P_AF_IUCV)
data_offset = 0;
@ -2913,16 +2915,16 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
/* fix hardware limitation: as long as we do not have sbal
* chaining we can not send long frag lists
*/
if (large_send) {
if (!qeth_get_elements_no_tso(card, new_skb, 1)) {
if (skb_linearize(new_skb))
goto tx_drop;
if (card->options.performance_stats)
card->perf_stats.tx_lin++;
}
if ((card->info.type != QETH_CARD_TYPE_IQD) &&
((use_tso && !qeth_l3_get_elements_no_tso(card, new_skb, 1)) ||
(!use_tso && !qeth_get_elements_no(card, new_skb, 0)))) {
if (skb_linearize(new_skb))
goto tx_drop;
if (card->options.performance_stats)
card->perf_stats.tx_lin++;
}
if (large_send && (cast_type == RTN_UNSPEC)) {
if (use_tso) {
hdr = (struct qeth_hdr *)skb_push(new_skb,
sizeof(struct qeth_hdr_tso));
memset(hdr, 0, sizeof(struct qeth_hdr_tso));
@ -2949,7 +2951,9 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
qeth_l3_hdr_csum(card, hdr, new_skb);
}
elements = qeth_get_elements_no(card, new_skb, hdr_elements);
elements = use_tso ?
qeth_l3_get_elements_no_tso(card, new_skb, hdr_elements) :
qeth_get_elements_no(card, new_skb, hdr_elements);
if (!elements) {
if (data_offset >= 0)
kmem_cache_free(qeth_core_header_cache, hdr);
@ -2959,7 +2963,7 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (card->info.type != QETH_CARD_TYPE_IQD) {
int len;
if (large_send)
if (use_tso)
len = ((unsigned long)tcp_hdr(new_skb) +
tcp_hdrlen(new_skb)) -
(unsigned long)new_skb->data;
@ -2980,7 +2984,7 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
dev_kfree_skb_any(skb);
if (card->options.performance_stats) {
nr_frags = skb_shinfo(new_skb)->nr_frags;
if (large_send) {
if (use_tso) {
card->perf_stats.large_send_bytes += tx_bytes;
card->perf_stats.large_send_cnt++;
}