netdev - [PATCH net-next v2 3/4] net: sched: introduce __tc_classid_to

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Date:   Mon,  2 Aug 2021 17:08:48 +0300
From:   Vadym Kochan <vadym.kochan@...ision.eu>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vladimir Oltean <olteanv@...il.com>,
        Serhiy Boiko <serhiy.boiko@...ision.eu>,
        Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
        Taras Chornyi <taras.chornyi@...ision.eu>
Cc:     Vadym Kochan <vadym.kochan@...ision.eu>,
        Taras Chornyi <tchornyi@...vell.com>,
        Mickey Rachamim <mickeyr@...vell.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Vadym Kochan <vkochan@...vell.com>
Subject: [PATCH net-next v2 3/4] net: sched: introduce __tc_classid_to_hwtc() helper

From: Vadym Kochan <vkochan@...vell.com>

There might be a case when the ingress HW queues are globally shared in
ASIC and are not per port (netdev). So add a __tc_classid_to_hwtc()
version which accepts number of tc instead of netdev.

Signed-off-by: Vadym Kochan <vkochan@...vell.com>
---
 include/net/sch_generic.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index c0069ac00e62..df04f4035a4b 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -668,11 +668,16 @@ qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
 	return NULL;
 }
 
-static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
+static inline int __tc_classid_to_hwtc(u32 tc_num, u32 classid)
 {
 	u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
 
-	return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
+	return (hwtc < tc_num) ? hwtc : -EINVAL;
+}
+
+static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
+{
+	return __tc_classid_to_hwtc(netdev_get_num_tc(dev), classid);
 }
 
 int qdisc_class_hash_init(struct Qdisc_class_hash *);
-- 
2.17.1