From: Eugene Crosser <eugene.cros...@ru.ibm.com>
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.cros...@ru.ibm.com>
Signed-off-by: Ursula Braun <ubr...@linux.vnet.ibm.com>
Reviewed-by: Lakhvich Dmitriy <ldmit...@ru.ibm.com>
Reviewed-by: Thomas Richter <tmri...@de.ibm.com>
---
drivers/s390/net/qeth_core.h | 1 +
drivers/s390/net/qeth_core_main.c | 6 ++++--
drivers/s390/net/qeth_l2_main.c | 12 +++++++++---
drivers/s390/net/qeth_l3_main.c | 12 +++++++++---
4 files changed, 23 insertions(+), 8 deletions(-)
diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index c3ab956..b4f14e4 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -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 */
diff --git a/drivers/s390/net/qeth_core_main.c
b/drivers/s390/net/qeth_core_main.c
index a91a31d..9806ee0 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -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);
diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index e24627f..08b5fa9 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -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)
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 0afdb14..51077fb 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -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) {
--
2.6.6
