diff options
| author | Julian Wiedmann <jwi@linux.ibm.com> | 2020-03-18 13:54:50 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-03-18 16:33:35 -0700 |
| commit | 5d8ce41c6a878afac157a61299a9f810bf80995e (patch) | |
| tree | dea9998c36efac5d4f3b2322ca019de1bf3add28 /drivers/s390/net/qeth_core.h | |
| parent | 66cddf101901a6cfcd21c840f0535e8f1c8c5186 (diff) | |
s390/qeth: balance the TX queue selection for IQD devices
For ucast traffic, qeth_iqd_select_queue() falls back to
netdev_pick_tx(). This will potentially use skb_tx_hash() to distribute
the flow over all active TX queues - so txq 0 is a valid selection, and
qeth_iqd_select_queue() needs to check for this and put it on some other
queue. As a result, the distribution for ucast flows is unbalanced and
hits QETH_IQD_MIN_UCAST_TXQ heavier than the other queues.
Open-coding a custom variant of skb_tx_hash() isn't an option, since
netdev_pick_tx() also gives us eg. access to XPS. But we can pull a
little trick: add a single TC class that excludes the mcast txq, and
thus encourage skb_tx_hash() to not pick the mcast txq.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/s390/net/qeth_core.h')
| -rw-r--r-- | drivers/s390/net/qeth_core.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h index 94cd39631eee..b8b356aca674 100644 --- a/drivers/s390/net/qeth_core.h +++ b/drivers/s390/net/qeth_core.h @@ -1061,6 +1061,7 @@ netdev_features_t qeth_features_check(struct sk_buff *skb, struct net_device *dev, netdev_features_t features); void qeth_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats); +int qeth_set_real_num_tx_queues(struct qeth_card *card, unsigned int count); u16 qeth_iqd_select_queue(struct net_device *dev, struct sk_buff *skb, u8 cast_type, struct net_device *sb_dev); int qeth_open(struct net_device *dev); |