Subject: [PATCH rdma-next v1 11/17] RDMA/netlink: Implement counter dumpit calback

From: Leon Romanovsky <[email-masked]>
Date: Sun, 7 Apr 2019 10:50:07 +0300

From: Mark Zhang <[email-masked]>

This patch adds the ability to return all available counters
together with their properties and hwstats.

Signed-off-by: Mark Zhang <[email-masked]>
Reviewed-by: Majd Dibbiny <[email-masked]>
Signed-off-by: Leon Romanovsky <[email-masked]>
---
 drivers/infiniband/core/counters.c |  28 +++++
 drivers/infiniband/core/device.c   |   2 +
 drivers/infiniband/core/nldev.c    | 173 +++++++++++++++++++++++++++++
 include/rdma/ib_verbs.h            |  10 ++
 include/rdma/rdma_counter.h        |   3 +
 include/uapi/rdma/rdma_netlink.h   |  10 +-
 6 files changed, 225 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/counters.c b/drivers/infiniband/core/counters.c
index 665e0d43c21b..36cd9eca1e46 100644
--- a/drivers/infiniband/core/counters.c
+++ b/drivers/infiniband/core/counters.c
@@ -62,6 +62,9 @@ static struct rdma_counter *rdma_counter_alloc(struct ib_device *dev, u8 port,
 {
 	struct rdma_counter *counter;
 
+	if (!dev->ops.counter_alloc_stats)
+		return NULL;
+
 	counter = kzalloc(sizeof(*counter), GFP_KERNEL);
 	if (!counter)
 		return NULL;
@@ -69,16 +72,25 @@ static struct rdma_counter *rdma_counter_alloc(struct ib_device *dev, u8 port,
 	counter->device    = dev;
 	counter->port      = port;
 	counter->res.type  = RDMA_RESTRACK_COUNTER;
+	counter->stats     = dev->ops.counter_alloc_stats(counter);
+	if (!counter->stats)
+		goto err_stats;
+
 	counter->mode.mode = mode;
 	atomic_set(&counter->usecnt, 0);
 	mutex_init(&counter->lock);
 
 	return counter;
+
+err_stats:
+	kfree(counter);
+	return NULL;
 }
 
 static void rdma_counter_dealloc(struct rdma_counter *counter)
 {
 	rdma_restrack_del(&counter->res);
+	kfree(counter->stats);
 	kfree(counter);
 }
 
@@ -279,6 +291,22 @@ int rdma_counter_unbind_qp(struct ib_qp *qp, bool force)
 	return 0;
 }
 
+int rdma_counter_query_stats(struct rdma_counter *counter)
+{
+	int ret;
+
+	struct ib_device *dev = counter->device;
+
+	if (!dev->ops.counter_update_stats)
+		return -EINVAL;
+
+	mutex_lock(&counter->lock);
+	ret = dev->ops.counter_update_stats(counter);
+	mutex_unlock(&counter->lock);
+
+	return ret;
+}
+
 void rdma_counter_init(struct ib_device *dev)
 {
 	struct rdma_port_counter *port_counter;
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index b85f12ab25bb..b24a15d7c0c6 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -2379,6 +2379,8 @@ void ib_set_device_ops(struct ib_device *dev, const struct ib_device_ops *ops)
 	SET_DEVICE_OP(dev_ops, unmap_fmr);
 	SET_DEVICE_OP(dev_ops, counter_bind_qp);
 	SET_DEVICE_OP(dev_ops, counter_unbind_qp);
+	SET_DEVICE_OP(dev_ops, counter_alloc_stats);
+	SET_DEVICE_OP(dev_ops, counter_update_stats);
 
 	SET_OBJ_SIZE(dev_ops, ib_ah);
 	SET_OBJ_SIZE(dev_ops, ib_pd);
diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index 44c53d053089..6f65da50f2ba 100644
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -123,6 +123,13 @@ static const struct nla_policy nldev_policy[RDMA_NLDEV_ATTR_MAX] = {
 	[RDMA_NLDEV_ATTR_STAT_MODE]		= { .type = NLA_U32 },
 	[RDMA_NLDEV_ATTR_STAT_RES]		= { .type = NLA_U32 },
 	[RDMA_NLDEV_ATTR_STAT_AUTO_MODE_MASK]	= { .type = NLA_U32 },
+	[RDMA_NLDEV_ATTR_STAT_COUNTER]		= { .type = NLA_NESTED },
+	[RDMA_NLDEV_ATTR_STAT_COUNTER_ENTRY]	= { .type = NLA_NESTED },
+	[RDMA_NLDEV_ATTR_STAT_COUNTER_ID]       = { .type = NLA_U32 },
+	[RDMA_NLDEV_ATTR_STAT_HWCOUNTERS]       = { .type = NLA_NESTED },
+	[RDMA_NLDEV_ATTR_STAT_HWCOUNTER_ENTRY]  = { .type = NLA_NESTED },
+	[RDMA_NLDEV_ATTR_STAT_HWCOUNTER_ENTRY_NAME] = { .type = NLA_NUL_STRING },
+	[RDMA_NLDEV_ATTR_STAT_HWCOUNTER_ENTRY_VALUE] = { .type = NLA_U64 },
 };
 
 static int put_driver_name_print_type(struct sk_buff *msg, const char *name,
@@ -625,6 +632,160 @@ static int fill_res_pd_entry(struct sk_buff *msg, bool has_cap_net_admin,
 err:	return -EMSGSIZE;
 }
 
+static int fill_stat_counter_mode(struct sk_buff *msg,
+				  struct rdma_counter *counter)
+{
+	struct rdma_counter_mode *m = &counter->mode;
+
+	if (nla_put_u32(msg, RDMA_NLDEV_ATTR_STAT_MODE, m->mode))
+		return -EMSGSIZE;
+
+	if (m->mode == RDMA_COUNTER_MODE_AUTO)
+		if ((m->mask & RDMA_COUNTER_MASK_QP_TYPE) &&
+		    nla_put_u8(msg, RDMA_NLDEV_ATTR_RES_TYPE, m->param.qp_type))
+			return -EMSGSIZE;
+
+	return 0;
+}
+
+static int fill_stat_counter_qp_entry(struct sk_buff *msg, u32 qpn)
+{
+	struct nlattr *entry_attr;
+
+	entry_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_RES_QP_ENTRY);
+	if (!entry_attr)
+		return -EMSGSIZE;
+
+	if (nla_put_u32(msg, RDMA_NLDEV_ATTR_RES_LQPN, qpn))
+		goto err;
+
+	nla_nest_end(msg, entry_attr);
+	return 0;
+
+err:
+	nla_nest_cancel(msg, entry_attr);
+	return -EMSGSIZE;
+}
+
+static int fill_stat_counter_qps(struct sk_buff *msg,
+				 struct rdma_counter *counter)
+{
+	struct rdma_restrack_entry *res;
+	struct rdma_restrack_root *rt;
+	struct nlattr *table_attr;
+	struct ib_qp *qp = NULL;
+	unsigned long id = 0;
+	int ret = 0;
+
+	table_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_RES_QP);
+
+	rt = &counter->device->res[RDMA_RESTRACK_QP];
+	xa_lock(&rt->xa);
+	xa_for_each(&rt->xa, id, res) {
+		if (!rdma_is_visible_in_pid_ns(res))
+			continue;
+
+		if (!rdma_restrack_get(res))
+			continue;
+
+		qp = container_of(res, struct ib_qp, res);
+		if (qp->qp_type == IB_QPT_RAW_PACKET && !capable(CAP_NET_RAW))
+			goto next;
+
+		if (!qp->counter || (qp->counter->id != counter->id))
+			goto next;
+
+		ret = fill_stat_counter_qp_entry(msg, qp->qp_num);
+		if (ret) {
+			rdma_restrack_put(res);
+			goto err;
+		}
+
+next:
+		rdma_restrack_put(res);
+	}
+
+	xa_unlock(&rt->xa);
+	nla_nest_end(msg, table_attr);
+	return 0;
+
+err:
+	xa_unlock(&rt->xa);
+	nla_nest_cancel(msg, table_attr);
+	return ret;
+}
+
+static int fill_stat_hwcounter_entry(struct sk_buff *msg,
+				     const char *name, u64 value)
+{
+	struct nlattr *entry_attr;
+
+	entry_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_STAT_HWCOUNTER_ENTRY);
+	if (!entry_attr)
+		return -EMSGSIZE;
+
+	if (nla_put_string(msg, RDMA_NLDEV_ATTR_STAT_HWCOUNTER_ENTRY_NAME,
+			   name))
+		goto err;
+	if (nla_put_u64_64bit(msg, RDMA_NLDEV_ATTR_STAT_HWCOUNTER_ENTRY_VALUE,
+			      value, RDMA_NLDEV_ATTR_PAD))
+		goto err;
+
+	nla_nest_end(msg, entry_attr);
+	return 0;
+
+err:
+	nla_nest_cancel(msg, entry_attr);
+	return -EMSGSIZE;
+}
+
+static int fill_stat_counter_hwcounters(struct sk_buff *msg,
+					struct rdma_counter *counter)
+{
+	struct rdma_hw_stats *st = counter->stats;
+	struct nlattr *table_attr;
+	int i;
+
+	table_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_STAT_HWCOUNTERS);
+	if (!table_attr)
+		return -EMSGSIZE;
+
+	for (i = 0; i < st->num_counters; i++)
+		if (fill_stat_hwcounter_entry(msg, st->names[i], st->value[i]))
+			goto err;
+
+	nla_nest_end(msg, table_attr);
+	return 0;
+
+err:
+	nla_nest_cancel(msg, table_attr);
+	return -EMSGSIZE;
+}
+
+static int fill_res_counter_entry(struct sk_buff *msg, bool has_cap_net_admin,
+				  struct rdma_restrack_entry *res,
+				  uint32_t port)
+{
+	struct rdma_counter *counter =
+		container_of(res, struct rdma_counter, res);
+
+	if (port && port != counter->port)
+		return 0;
+
+	/* Dump it even query failed */
+	rdma_counter_query_stats(counter);
+
+	if (nla_put_u32(msg, RDMA_NLDEV_ATTR_PORT_INDEX, counter->port) ||
+	    nla_put_u32(msg, RDMA_NLDEV_ATTR_STAT_COUNTER_ID, counter->id) ||
+	    fill_res_name_pid(msg, &counter->res) ||
+	    fill_stat_counter_mode(msg, counter) ||
+	    fill_stat_counter_qps(msg, counter) ||
+	    fill_stat_counter_hwcounters(msg, counter))
+		return -EMSGSIZE;
+
+	return 0;
+}
+
 static int nldev_get_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
 			  struct netlink_ext_ack *extack)
 {
@@ -993,6 +1154,13 @@ static const struct nldev_fill_res_entry fill_entries[RDMA_RESTRACK_MAX] = {
 		.entry = RDMA_NLDEV_ATTR_RES_PD_ENTRY,
 		.id = RDMA_NLDEV_ATTR_RES_PDN,
 	},
+	[RDMA_RESTRACK_COUNTER] = {
+		.fill_res_func = fill_res_counter_entry,
+		.nldev_cmd = RDMA_NLDEV_CMD_STAT_GET,
+		.nldev_attr = RDMA_NLDEV_ATTR_STAT_COUNTER,
+		.entry = RDMA_NLDEV_ATTR_STAT_COUNTER_ENTRY,
+		.id = RDMA_NLDEV_ATTR_STAT_COUNTER_ID,
+	},
 };
 
 static int res_get_common_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
@@ -1229,6 +1397,7 @@ RES_GET_FUNCS(cm_id, RDMA_RESTRACK_CM_ID);
 RES_GET_FUNCS(cq, RDMA_RESTRACK_CQ);
 RES_GET_FUNCS(pd, RDMA_RESTRACK_PD);
 RES_GET_FUNCS(mr, RDMA_RESTRACK_MR);
+RES_GET_FUNCS(counter, RDMA_RESTRACK_COUNTER);
 
 static LIST_HEAD(link_ops);
 static DECLARE_RWSEM(link_ops_rwsem);
@@ -1515,6 +1684,10 @@ static const struct rdma_nl_cbs nldev_cb_table[RDMA_NLDEV_NUM_OPS] = {
 		.doit = nldev_stat_set_doit,
 		.flags = RDMA_NL_ADMIN_PERM,
 	},
+	[RDMA_NLDEV_CMD_STAT_GET] = {
+		.doit = nldev_res_get_counter_doit,
+		.dump = nldev_res_get_counter_dumpit,
+	},
 };
 
 void __init nldev_init(void)
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index ca809923ae5e..c136eb00d4e7 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -2570,6 +2570,16 @@ struct ib_device_ops {
 	 *   used in cases like qp destroy.
 	 */
 	int (*counter_unbind_qp)(struct ib_qp *qp, bool force);
+	/**
+	 * counter_alloc_stats - Allocate a struct rdma_hw_stats and fill in
+	 * the driver initialized data.
+	 */
+	struct rdma_hw_stats *(*counter_alloc_stats)(
+		struct rdma_counter *counter);
+	/**
+	 * counter_update_stats - Query the stats value of this counter
+	 */
+	int (*counter_update_stats)(struct rdma_counter *counter);
 
 	DECLARE_RDMA_OBJ_SIZE(ib_ah);
 	DECLARE_RDMA_OBJ_SIZE(ib_pd);
diff --git a/include/rdma/rdma_counter.h b/include/rdma/rdma_counter.h
index 159b8ba3487e..4bc62909a638 100644
--- a/include/rdma/rdma_counter.h
+++ b/include/rdma/rdma_counter.h
@@ -37,6 +37,7 @@ struct rdma_counter {
 	atomic_t			usecnt;
 	struct rdma_counter_mode	mode;
 	struct mutex			lock;
+	struct rdma_hw_stats		*stats;
 	u8				port;
 };
 
@@ -47,4 +48,6 @@ int rdma_counter_set_auto_mode(struct ib_device *dev, u8 port,
 int rdma_counter_bind_qp_auto(struct ib_qp *qp, u8 port);
 int rdma_counter_unbind_qp(struct ib_qp *qp, bool force);
 
+int rdma_counter_query_stats(struct rdma_counter *counter);
+
 #endif /* _RDMA_COUNTER_H_ */
diff --git a/include/uapi/rdma/rdma_netlink.h b/include/uapi/rdma/rdma_netlink.h
index d1439df60ce5..1c6b4ac64f61 100644
--- a/include/uapi/rdma/rdma_netlink.h
+++ b/include/uapi/rdma/rdma_netlink.h
@@ -269,6 +269,8 @@ enum rdma_nldev_command {
 
 	RDMA_NLDEV_CMD_STAT_SET,
 
+	RDMA_NLDEV_CMD_STAT_GET, /* can dump */
+
 	RDMA_NLDEV_NUM_OPS
 };
 
@@ -486,7 +488,13 @@ enum rdma_nldev_attr {
 	RDMA_NLDEV_ATTR_STAT_MODE,		/* u32 */
 	RDMA_NLDEV_ATTR_STAT_RES,		/* u32 */
 	RDMA_NLDEV_ATTR_STAT_AUTO_MODE_MASK,	/* u32 */
-
+	RDMA_NLDEV_ATTR_STAT_COUNTER,		/* nested table */
+	RDMA_NLDEV_ATTR_STAT_COUNTER_ENTRY,	/* nested table */
+	RDMA_NLDEV_ATTR_STAT_COUNTER_ID,	/* u32 */
+	RDMA_NLDEV_ATTR_STAT_HWCOUNTERS,	/* nested table */
+	RDMA_NLDEV_ATTR_STAT_HWCOUNTER_ENTRY,	/* nested table */
+	RDMA_NLDEV_ATTR_STAT_HWCOUNTER_ENTRY_NAME,	/* string */
+	RDMA_NLDEV_ATTR_STAT_HWCOUNTER_ENTRY_VALUE,	/* u64 */
 	/*
 	 * Always the end
 	 */
-- 
2.20.1