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qeth: introduce linearization fail count to stats 

When skb data touches too many pages, skb_linearize() is called
opportunistically in the hope that less pages will be required
for a big linear buffer than for multiple fragments. This patch
intoduces a separate counter in ethtool statistics structure
representing _failed_ linearization attempts.

Signed-off-by: Eugene Crosser <Eugene.Crosser@ru.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Reviewed-by: Lakhvich Dmitriy <ldmitriy@ru.ibm.com>
Reviewed-by: Thomas Richter <tmricht@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eugene Crosser 2016-06-16 16:18:57 +02:00 committed by David S. Miller
parent 2601e4ed3f
commit 6059c90537
4 changed files with 23 additions and 8 deletions
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1
drivers/s390/net/qeth_core.h
View File

@ -145,6 +145,7 @@ struct qeth_perf_stats {
unsigned int sg_alloc_page_rx;
unsigned int tx_csum;
unsigned int tx_lin;
unsigned int tx_linfail;
};
/* Routing stuff */

6
drivers/s390/net/qeth_core_main.c
View File

@ -5801,6 +5801,7 @@ static struct {
{"tx do_QDIO count"},
{"tx csum"},
{"tx lin"},
{"tx linfail"},
{"cq handler count"},
{"cq handler time"}
};
@ -5861,8 +5862,9 @@ void qeth_core_get_ethtool_stats(struct net_device *dev,
data[32] = card->perf_stats.outbound_do_qdio_cnt;
data[33] = card->perf_stats.tx_csum;
data[34] = card->perf_stats.tx_lin;
data[35] = card->perf_stats.cq_cnt;
data[36] = card->perf_stats.cq_time;
data[35] = card->perf_stats.tx_linfail;
data[36] = card->perf_stats.cq_cnt;
data[37] = card->perf_stats.cq_time;
}
EXPORT_SYMBOL_GPL(qeth_core_get_ethtool_stats);

12
drivers/s390/net/qeth_l2_main.c
View File

@ -898,10 +898,16 @@ static int qeth_l2_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
*/
if ((card->info.type != QETH_CARD_TYPE_IQD) &&
!qeth_get_elements_no(card, new_skb, 0)) {
if (skb_linearize(new_skb))
int lin_rc = skb_linearize(new_skb);
if (card->options.performance_stats) {
if (lin_rc)
card->perf_stats.tx_linfail++;
else
card->perf_stats.tx_lin++;
}
if (lin_rc)
goto tx_drop;
if (card->options.performance_stats)
card->perf_stats.tx_lin++;
}
if (card->info.type == QETH_CARD_TYPE_OSN)

12
drivers/s390/net/qeth_l3_main.c
View File

@ -2918,10 +2918,16 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
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))
int lin_rc = skb_linearize(new_skb);
if (card->options.performance_stats) {
if (lin_rc)
card->perf_stats.tx_linfail++;
else
card->perf_stats.tx_lin++;
}
if (lin_rc)
goto tx_drop;
if (card->options.performance_stats)
card->perf_stats.tx_lin++;
}
if (use_tso) {