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@xxxxxxxxxxxxx>
---
drivers/s390/net/qeth_core.h | 1 +
drivers/s390/net/qeth_core_main.c | 45 ++++++++++++++++++++++++++++++-
drivers/s390/net/qeth_ethtool.c | 2 +-
3 files changed, 46 insertions(+), 2 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);
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index aa493edc0082..e1d984c29e1f 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -6025,7 +6025,7 @@ int qeth_setup_netdev(struct qeth_card *card)
num_tx_queues = dev->real_num_tx_queues;
}
- return netif_set_real_num_tx_queues(dev, num_tx_queues);
+ return qeth_set_real_num_tx_queues(card, num_tx_queues);
}
EXPORT_SYMBOL_GPL(qeth_setup_netdev);
@@ -6641,6 +6641,47 @@ void qeth_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
}
EXPORT_SYMBOL_GPL(qeth_get_stats64);
+#define TC_IQD_UCAST 0
+static void qeth_iqd_set_prio_tc_map(struct net_device *dev,
+ unsigned int ucast_txqs)
+{
+ unsigned int prio;
+
+ /* IQD requires mcast traffic to be placed on a dedicated queue, and
+ * qeth_iqd_select_queue() deals with this.
+ * For unicast traffic, we defer the queue selection to the stack.
+ * By installing a trivial prio map that spans over only the unicast
+ * queues, we can encourage the stack to spread the ucast traffic evenly
+ * without selecting the mcast queue.
+ */
+
+ /* One traffic class, spanning over all active ucast queues: */
+ netdev_set_num_tc(dev, 1);
+ netdev_set_tc_queue(dev, TC_IQD_UCAST, ucast_txqs,
+ QETH_IQD_MIN_UCAST_TXQ);
+
+ /* Map all priorities to this traffic class: */
+ for (prio = 0; prio <= TC_BITMASK; prio++)
+ netdev_set_prio_tc_map(dev, prio, TC_IQD_UCAST);
+}
+
+int qeth_set_real_num_tx_queues(struct qeth_card *card, unsigned int count)
+{
+ struct net_device *dev = card->dev;
+ int rc;
+
+ /* Per netif_setup_tc(), adjust the mapping first: */
+ if (IS_IQD(card))
+ qeth_iqd_set_prio_tc_map(dev, count - 1);
+
+ rc = netif_set_real_num_tx_queues(dev, count);
+
+ if (rc && IS_IQD(card))
+ qeth_iqd_set_prio_tc_map(dev, dev->real_num_tx_queues - 1);
+
+ return rc;
+}
+
u16 qeth_iqd_select_queue(struct net_device *dev, struct sk_buff *skb,
u8 cast_type, struct net_device *sb_dev)
{
@@ -6648,6 +6689,8 @@ u16 qeth_iqd_select_queue(struct net_device *dev, struct sk_buff *skb,
if (cast_type != RTN_UNICAST)
return QETH_IQD_MCAST_TXQ;
+ if (dev->real_num_tx_queues == QETH_IQD_MIN_TXQ)
+ return QETH_IQD_MIN_UCAST_TXQ;
txq = netdev_pick_tx(dev, skb, sb_dev);
return (txq == QETH_IQD_MCAST_TXQ) ? QETH_IQD_MIN_UCAST_TXQ : txq;
diff --git a/drivers/s390/net/qeth_ethtool.c b/drivers/s390/net/qeth_ethtool.c
index 715ee0015847..079b695032ef 100644
--- a/drivers/s390/net/qeth_ethtool.c
+++ b/drivers/s390/net/qeth_ethtool.c
@@ -201,7 +201,7 @@ static int qeth_set_channels(struct net_device *dev,
return -EOPNOTSUPP;
}
- return netif_set_real_num_tx_queues(dev, channels->tx_count);
+ return qeth_set_real_num_tx_queues(card, channels->tx_count);
}
static int qeth_get_tunable(struct net_device *dev,
--
2.17.1
