mqprio: Reserve last 32 classid values for HW traffic classes and misc IDs

This patch makes a slight tweak to mqprio in order to bring the
classid values used back in line with what is used for mq. The general idea
is to reserve values :ffe0 - :ffef to identify hardware traffic classes
normally reported via dev->num_tc. By doing this we can maintain a
consistent behavior with mq for classid where :1 - :ffdf will represent a
physical qdisc mapped onto a Tx queue represented by classid - 1, and the
traffic classes will be mapped onto a known subset of classid values
reserved for our virtual qdiscs.

Note I reserved the range from :fff0 - :ffff since this way we might be
able to reuse these classid values with clsact and ingress which would mean
that for mq, mqprio, ingress, and clsact we should be able to maintain a
similar classid layout.

Signed-off-by: Alexander Duyck <[email protected]>
Tested-by: Jesus Sanchez-Palencia <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Alexander Duyck

include/uapi/linux/pkt_sched.h

@@ -74,6 +74,7 @@ struct tc_estimator {
 #define TC_H_INGRESS    (0xFFFFFFF1U)
 #define TC_H_CLSACT	TC_H_INGRESS
 
+#define TC_H_MIN_PRIORITY	0xFFE0U
 #define TC_H_MIN_INGRESS	0xFFF2U
 #define TC_H_MIN_EGRESS		0xFFF3U
 

net/sched/sch_mqprio.c

@@ -153,6 +153,10 @@ static int mqprio_init(struct Qdisc *sch, struct nlattr *opt)
 	if (!netif_is_multiqueue(dev))
 		return -EOPNOTSUPP;
 
+	/* make certain can allocate enough classids to handle queues */
+	if (dev->num_tx_queues >= TC_H_MIN_PRIORITY)
+		return -ENOMEM;
+
 	if (!opt || nla_len(opt) < sizeof(*qopt))
 		return -EINVAL;
 
@@ -305,7 +309,7 @@ static struct netdev_queue *mqprio_queue_get(struct Qdisc *sch,
 					     unsigned long cl)
 {
 	struct net_device *dev = qdisc_dev(sch);
-	unsigned long ntx = cl - 1 - netdev_get_num_tc(dev);
+	unsigned long ntx = cl - 1;
 
 	if (ntx >= dev->num_tx_queues)
 		return NULL;
@@ -447,38 +451,35 @@ static unsigned long mqprio_find(struct Qdisc *sch, u32 classid)
 	struct net_device *dev = qdisc_dev(sch);
 	unsigned int ntx = TC_H_MIN(classid);
 
-	if (ntx > dev->num_tx_queues + netdev_get_num_tc(dev))
-		return 0;
-	return ntx;
+	/* There are essentially two regions here that have valid classid
+	 * values. The first region will have a classid value of 1 through
+	 * num_tx_queues. All of these are backed by actual Qdiscs.
+	 */
+	if (ntx < TC_H_MIN_PRIORITY)
+		return (ntx <= dev->num_tx_queues) ? ntx : 0;
+
+	/* The second region represents the hardware traffic classes. These
+	 * are represented by classid values of TC_H_MIN_PRIORITY through
+	 * TC_H_MIN_PRIORITY + netdev_get_num_tc - 1
+	 */
+	return ((ntx - TC_H_MIN_PRIORITY) < netdev_get_num_tc(dev)) ? ntx : 0;
 }
 
 static int mqprio_dump_class(struct Qdisc *sch, unsigned long cl,
 			 struct sk_buff *skb, struct tcmsg *tcm)
 {
-	struct net_device *dev = qdisc_dev(sch);
+	if (cl < TC_H_MIN_PRIORITY) {
+		struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
+		struct net_device *dev = qdisc_dev(sch);
+		int tc = netdev_txq_to_tc(dev, cl - 1);
 
-	if (cl <= netdev_get_num_tc(dev)) {
+		tcm->tcm_parent = (tc < 0) ? 0 :
+			TC_H_MAKE(TC_H_MAJ(sch->handle),
+				  TC_H_MIN(tc + TC_H_MIN_PRIORITY));
+		tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
+	} else {
 		tcm->tcm_parent = TC_H_ROOT;
 		tcm->tcm_info = 0;
-	} else {
-		int i;
-		struct netdev_queue *dev_queue;
-
-		dev_queue = mqprio_queue_get(sch, cl);
-		tcm->tcm_parent = 0;
-		for (i = 0; i < netdev_get_num_tc(dev); i++) {
-			struct netdev_tc_txq tc = dev->tc_to_txq[i];
-			int q_idx = cl - netdev_get_num_tc(dev);
-
-			if (q_idx > tc.offset &&
-			    q_idx <= tc.offset + tc.count) {
-				tcm->tcm_parent =
-					TC_H_MAKE(TC_H_MAJ(sch->handle),
-						  TC_H_MIN(i + 1));
-				break;
-			}
-		}
-		tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
 	}
 	tcm->tcm_handle |= TC_H_MIN(cl);
 	return 0;
@@ -489,15 +490,14 @@ static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
 	__releases(d->lock)
 	__acquires(d->lock)
 {
-	struct net_device *dev = qdisc_dev(sch);
-
-	if (cl <= netdev_get_num_tc(dev)) {
+	if (cl >= TC_H_MIN_PRIORITY) {
 		int i;
 		__u32 qlen = 0;
 		struct Qdisc *qdisc;
 		struct gnet_stats_queue qstats = {0};
 		struct gnet_stats_basic_packed bstats = {0};
-		struct netdev_tc_txq tc = dev->tc_to_txq[cl - 1];
+		struct net_device *dev = qdisc_dev(sch);
+		struct netdev_tc_txq tc = dev->tc_to_txq[cl & TC_BITMASK];
 
 		/* Drop lock here it will be reclaimed before touching
 		 * statistics this is required because the d->lock we
@@ -550,12 +550,25 @@ static void mqprio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
 
 	/* Walk hierarchy with a virtual class per tc */
 	arg->count = arg->skip;
-	for (ntx = arg->skip;
-	     ntx < dev->num_tx_queues + netdev_get_num_tc(dev);
-	     ntx++) {
+	for (ntx = arg->skip; ntx < netdev_get_num_tc(dev); ntx++) {
+		if (arg->fn(sch, ntx + TC_H_MIN_PRIORITY, arg) < 0) {
+			arg->stop = 1;
+			return;
+		}
+		arg->count++;
+	}
+
+	/* Pad the values and skip over unused traffic classes */
+	if (ntx < TC_MAX_QUEUE) {
+		arg->count = TC_MAX_QUEUE;
+		ntx = TC_MAX_QUEUE;
+	}
+
+	/* Reset offset, sort out remaining per-queue qdiscs */
+	for (ntx -= TC_MAX_QUEUE; ntx < dev->num_tx_queues; ntx++) {
 		if (arg->fn(sch, ntx + 1, arg) < 0) {
 			arg->stop = 1;
-			break;
+			return;
 		}
 		arg->count++;
 	}