RDMA/netlink: Implement counter dumpit calback

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

Signed-off-by: Mark Zhang <markz@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

1 files changed, 213 insertions, 0 deletions

diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index 9a4cf285f447..cebc15b23b15 100644
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -129,6 +129,13 @@ static const struct nla_policy nldev_policy[RDMA_NLDEV_ATTR_MAX] = {
 	[RDMA_NLDEV_ATTR_STAT_AUTO_MODE_MASK]	= { .type = NLA_U32 },
 	[RDMA_NLDEV_ATTR_STAT_MODE]		= { .type = NLA_U32 },
 	[RDMA_NLDEV_ATTR_STAT_RES]		= { .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 },
 	[RDMA_NLDEV_ATTR_SYS_IMAGE_GUID]	= { .type = NLA_U64 },
 	[RDMA_NLDEV_ATTR_UVERBS_DRIVER_ID]	= { .type = NLA_U32 },
 	[RDMA_NLDEV_NET_NS_FD]			= { .type = NLA_U32 },
@@ -636,6 +643,152 @@ 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;
+
+		qp = container_of(res, struct ib_qp, res);
+		if (qp->qp_type == IB_QPT_RAW_PACKET && !capable(CAP_NET_RAW))
+			continue;
+
+		if (!qp->counter || (qp->counter->id != counter->id))
+			continue;
+
+		ret = fill_stat_counter_qp_entry(msg, qp->qp_num);
+		if (ret)
+			goto err;
+	}
+
+	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)
 {
@@ -1003,6 +1156,13 @@ 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,
@@ -1239,6 +1399,7 @@ 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);
@@ -1557,6 +1718,54 @@ err:
 	return ret;
 }
 
+static int nldev_stat_get_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
+			       struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[RDMA_NLDEV_ATTR_MAX];
+	int ret;
+
+	ret = nlmsg_parse(nlh, 0, tb, RDMA_NLDEV_ATTR_MAX - 1,
+			  nldev_policy, extack);
+	if (ret || !tb[RDMA_NLDEV_ATTR_STAT_RES])
+		return -EINVAL;
+
+	switch (nla_get_u32(tb[RDMA_NLDEV_ATTR_STAT_RES])) {
+	case RDMA_NLDEV_ATTR_RES_QP:
+		ret = nldev_res_get_counter_doit(skb, nlh, extack);
+		break;
+
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+static int nldev_stat_get_dumpit(struct sk_buff *skb,
+				 struct netlink_callback *cb)
+{
+	struct nlattr *tb[RDMA_NLDEV_ATTR_MAX];
+	int ret;
+
+	ret = nlmsg_parse(cb->nlh, 0, tb, RDMA_NLDEV_ATTR_MAX - 1,
+			  nldev_policy, NULL);
+	if (ret || !tb[RDMA_NLDEV_ATTR_STAT_RES])
+		return -EINVAL;
+
+	switch (nla_get_u32(tb[RDMA_NLDEV_ATTR_STAT_RES])) {
+	case RDMA_NLDEV_ATTR_RES_QP:
+		ret = nldev_res_get_counter_dumpit(skb, cb);
+		break;
+
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
 static const struct rdma_nl_cbs nldev_cb_table[RDMA_NLDEV_NUM_OPS] = {
 	[RDMA_NLDEV_CMD_GET] = {
 		.doit = nldev_get_doit,
@@ -1615,6 +1824,10 @@ 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_stat_get_doit,
+		.dump = nldev_stat_get_dumpit,
+	},
 };
 
 void __init nldev_init(void)