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qeth: introduce linearization fail count to stats

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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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12
drivers/s390/net/qeth_l3_main.c
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@@ -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) {