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Date:   Tue,  7 Dec 2021 10:04:51 +0100
From:   Alexandra Winter <wintera@...ux.ibm.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        Heiko Carstens <hca@...ux.ibm.com>,
        Julian Wiedmann <jwi@...ux.ibm.com>,
        Alexandra Winter <wintera@...ux.ibm.com>
Subject: [PATCH net-next 4/5] s390/qeth: fine-tune .ndo_select_queue()

From: Julian Wiedmann <jwi@...ux.ibm.com>

Avoid a conditional branch for L2 devices when selecting the TX queue,
and have shared logic for OSA devices.

Signed-off-by: Julian Wiedmann <jwi@...ux.ibm.com>
Signed-off-by: Alexandra Winter <wintera@...ux.ibm.com>
---
 drivers/s390/net/qeth_core.h      |  4 ++--
 drivers/s390/net/qeth_core_main.c | 15 +++++++++++++--
 drivers/s390/net/qeth_l2_main.c   | 20 ++++++--------------
 drivers/s390/net/qeth_l3_main.c   | 13 +------------
 4 files changed, 22 insertions(+), 30 deletions(-)

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 20dca4c0384a..de25d7ac41da 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -1030,8 +1030,6 @@ static inline int qeth_send_simple_setassparms_v6(struct qeth_card *card,
 						 data, QETH_PROT_IPV6);
 }
 
-int qeth_get_priority_queue(struct qeth_card *card, struct sk_buff *skb);
-
 extern const struct qeth_discipline qeth_l2_discipline;
 extern const struct qeth_discipline qeth_l3_discipline;
 extern const struct ethtool_ops qeth_ethtool_ops;
@@ -1099,6 +1097,8 @@ 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);
+u16 qeth_osa_select_queue(struct net_device *dev, struct sk_buff *skb,
+			  struct net_device *sb_dev);
 int qeth_open(struct net_device *dev);
 int qeth_stop(struct net_device *dev);
 
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 629a7f5c4d71..093ee14e8051 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -3769,7 +3769,7 @@ static void qeth_qdio_output_handler(struct ccw_device *ccwdev,
 /*
  * Note: Function assumes that we have 4 outbound queues.
  */
-int qeth_get_priority_queue(struct qeth_card *card, struct sk_buff *skb)
+static int qeth_get_priority_queue(struct qeth_card *card, struct sk_buff *skb)
 {
 	struct vlan_ethhdr *veth = vlan_eth_hdr(skb);
 	u8 tos;
@@ -3814,7 +3814,6 @@ int qeth_get_priority_queue(struct qeth_card *card, struct sk_buff *skb)
 	}
 	return card->qdio.default_out_queue;
 }
-EXPORT_SYMBOL_GPL(qeth_get_priority_queue);
 
 /**
  * qeth_get_elements_for_frags() -	find number of SBALEs for skb frags.
@@ -7078,6 +7077,18 @@ u16 qeth_iqd_select_queue(struct net_device *dev, struct sk_buff *skb,
 }
 EXPORT_SYMBOL_GPL(qeth_iqd_select_queue);
 
+u16 qeth_osa_select_queue(struct net_device *dev, struct sk_buff *skb,
+			  struct net_device *sb_dev)
+{
+	struct qeth_card *card = dev->ml_priv;
+
+	if (qeth_uses_tx_prio_queueing(card))
+		return qeth_get_priority_queue(card, skb);
+
+	return netdev_pick_tx(dev, skb, sb_dev);
+}
+EXPORT_SYMBOL_GPL(qeth_osa_select_queue);
+
 int qeth_open(struct net_device *dev)
 {
 	struct qeth_card *card = dev->ml_priv;
diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index d1933c54bfbb..303461d70af3 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -519,19 +519,11 @@ static netdev_tx_t qeth_l2_hard_start_xmit(struct sk_buff *skb,
 	return NETDEV_TX_OK;
 }
 
-static u16 qeth_l2_select_queue(struct net_device *dev, struct sk_buff *skb,
-				struct net_device *sb_dev)
+static u16 qeth_l2_iqd_select_queue(struct net_device *dev, struct sk_buff *skb,
+				    struct net_device *sb_dev)
 {
-	struct qeth_card *card = dev->ml_priv;
-
-	if (IS_IQD(card))
-		return qeth_iqd_select_queue(dev, skb,
-					     qeth_get_ether_cast_type(skb),
-					     sb_dev);
-	if (qeth_uses_tx_prio_queueing(card))
-		return qeth_get_priority_queue(card, skb);
-
-	return netdev_pick_tx(dev, skb, sb_dev);
+	return qeth_iqd_select_queue(dev, skb, qeth_get_ether_cast_type(skb),
+				     sb_dev);
 }
 
 static void qeth_l2_set_rx_mode(struct net_device *dev)
@@ -1059,7 +1051,7 @@ static const struct net_device_ops qeth_l2_iqd_netdev_ops = {
 	.ndo_get_stats64	= qeth_get_stats64,
 	.ndo_start_xmit		= qeth_l2_hard_start_xmit,
 	.ndo_features_check	= qeth_features_check,
-	.ndo_select_queue	= qeth_l2_select_queue,
+	.ndo_select_queue	= qeth_l2_iqd_select_queue,
 	.ndo_validate_addr	= qeth_l2_validate_addr,
 	.ndo_set_rx_mode	= qeth_l2_set_rx_mode,
 	.ndo_eth_ioctl		= qeth_do_ioctl,
@@ -1080,7 +1072,7 @@ static const struct net_device_ops qeth_l2_osa_netdev_ops = {
 	.ndo_get_stats64	= qeth_get_stats64,
 	.ndo_start_xmit		= qeth_l2_hard_start_xmit,
 	.ndo_features_check	= qeth_features_check,
-	.ndo_select_queue	= qeth_l2_select_queue,
+	.ndo_select_queue	= qeth_osa_select_queue,
 	.ndo_validate_addr	= qeth_l2_validate_addr,
 	.ndo_set_rx_mode	= qeth_l2_set_rx_mode,
 	.ndo_eth_ioctl		= qeth_do_ioctl,
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 48a886f7af62..9251ad276ee8 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -1822,17 +1822,6 @@ static u16 qeth_l3_iqd_select_queue(struct net_device *dev, struct sk_buff *skb,
 				     qeth_l3_get_cast_type(skb, proto), sb_dev);
 }
 
-static u16 qeth_l3_osa_select_queue(struct net_device *dev, struct sk_buff *skb,
-				    struct net_device *sb_dev)
-{
-	struct qeth_card *card = dev->ml_priv;
-
-	if (qeth_uses_tx_prio_queueing(card))
-		return qeth_get_priority_queue(card, skb);
-
-	return netdev_pick_tx(dev, skb, sb_dev);
-}
-
 static const struct net_device_ops qeth_l3_netdev_ops = {
 	.ndo_open		= qeth_open,
 	.ndo_stop		= qeth_stop,
@@ -1854,7 +1843,7 @@ static const struct net_device_ops qeth_l3_osa_netdev_ops = {
 	.ndo_get_stats64	= qeth_get_stats64,
 	.ndo_start_xmit		= qeth_l3_hard_start_xmit,
 	.ndo_features_check	= qeth_l3_osa_features_check,
-	.ndo_select_queue	= qeth_l3_osa_select_queue,
+	.ndo_select_queue	= qeth_osa_select_queue,
 	.ndo_validate_addr	= eth_validate_addr,
 	.ndo_set_rx_mode	= qeth_l3_set_rx_mode,
 	.ndo_eth_ioctl		= qeth_do_ioctl,
-- 
2.32.0

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