linux-kernel - [PATCH] [v2] net: bql: fix building with BQL disabled

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Date: Wed, 28 Feb 2024 17:06:56 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Breno Leitao <leitao@...ian.org>
Cc: Arnd Bergmann <arnd@...db.de>,
	Siddharth Vadapalli <s-vadapalli@...com>,
	Roger Quadros <rogerq@...nel.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	Simon Horman <horms@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Christian Marangi <ansuelsmth@...il.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] net: bql: fix building with BQL disabled

From: Arnd Bergmann <arnd@...db.de>

It is now possible to disable BQL, but that causes the cpsw driver to break:

drivers/net/ethernet/ti/am65-cpsw-nuss.c:297:28: error: no member named 'dql' in 'struct netdev_queue'
  297 |                    dql_avail(&netif_txq->dql),

There is already a helper function in net/sch_generic.h that could
be used to help here. Move its implementation into the common
linux/netdevice.h along with the other bql interfaces and change
both users over to the new interface.

Fixes: ea7f3cfaa588 ("net: bql: allow the config to be disabled")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
v2: merge the two identical implementations
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c |  2 +-
 include/linux/netdevice.h                | 10 ++++++++++
 include/net/sch_generic.h                |  7 +------
 3 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 9d2f4ac783e4..2939a21ca74f 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -294,7 +294,7 @@ static void am65_cpsw_nuss_ndo_host_tx_timeout(struct net_device *ndev,
 		   txqueue,
 		   netif_tx_queue_stopped(netif_txq),
 		   jiffies_to_msecs(jiffies - trans_start),
-		   dql_avail(&netif_txq->dql),
+		   netdev_queue_dql_avail(netif_txq),
 		   k3_cppi_desc_pool_avail(tx_chn->desc_pool));
 
 	if (netif_tx_queue_stopped(netif_txq)) {
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 4236debc79a7..cd6fdc2e6948 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -3493,6 +3493,16 @@ static inline void netdev_queue_set_dql_min_limit(struct netdev_queue *dev_queue
 #endif
 }
 
+static inline int netdev_queue_dql_avail(const struct netdev_queue *txq)
+{
+#ifdef CONFIG_BQL
+	/* Non-BQL migrated drivers will return 0, too. */
+	return dql_avail(&txq->dql);
+#else
+	return 0;
+#endif
+}
+
 /**
  *	netdev_txq_bql_enqueue_prefetchw - prefetch bql data for write
  *	@dev_queue: pointer to transmit queue
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 934fdb977551..cefe0c4bdae3 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -238,12 +238,7 @@ static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
 
 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
 {
-#ifdef CONFIG_BQL
-	/* Non-BQL migrated drivers will return 0, too. */
-	return dql_avail(&txq->dql);
-#else
-	return 0;
-#endif
+	return netdev_queue_dql_avail(txq);
 }
 
 struct Qdisc_class_ops {
-- 
2.39.2