devlink: Implement devlink health reporters on per-port basis

Add devlink-health reporter support on per-port basis.
The main difference existing devlink-health is that port reporters are
stored in per-devlink_port lists. Upon creation of such health reporter the
reference to a port it belongs to is stored in reporter struct.

Fill the port index attribute in devlink-health response to
allow devlink userspace utility to distinguish between device and port
reporters.

Signed-off-by: Vladyslav Tarasiuk <vladyslavt@mellanox.com>
Reviewed-by: Moshe Shemesh <moshe@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/devlink.h b/include/net/devlink.h
index 746bed5..bb11397 100644 (file)
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -101,6 +101,8 @@ struct devlink_port {
        u8 attrs_set:1,
           switch_port:1;
        struct delayed_work type_warn_dw;
+       struct list_head reporter_list;
+       struct mutex reporters_lock; /* Protects reporter_list */
 };
 
 struct devlink_sb_pool_info {

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 4e995de..b4a231c 100644 (file)
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -386,19 +386,21 @@ devlink_region_snapshot_get_by_id(struct devlink_region *region, u32 id)
        return NULL;
 }
 
-#define DEVLINK_NL_FLAG_NEED_DEVLINK   BIT(0)
-#define DEVLINK_NL_FLAG_NEED_PORT      BIT(1)
-#define DEVLINK_NL_FLAG_NEED_SB                BIT(2)
+#define DEVLINK_NL_FLAG_NEED_DEVLINK           BIT(0)
+#define DEVLINK_NL_FLAG_NEED_PORT              BIT(1)
+#define DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT   BIT(2)
+#define DEVLINK_NL_FLAG_NEED_SB                        BIT(3)
 
 /* The per devlink instance lock is taken by default in the pre-doit
  * operation, yet several commands do not require this. The global
  * devlink lock is taken and protects from disruption by user-calls.
  */
-#define DEVLINK_NL_FLAG_NO_LOCK                BIT(3)
+#define DEVLINK_NL_FLAG_NO_LOCK                        BIT(4)
 
 static int devlink_nl_pre_doit(const struct genl_ops *ops,
                               struct sk_buff *skb, struct genl_info *info)
 {
+       struct devlink_port *devlink_port;
        struct devlink *devlink;
        int err;
 
@@ -413,14 +415,17 @@ static int devlink_nl_pre_doit(const struct genl_ops *ops,
        if (ops->internal_flags & DEVLINK_NL_FLAG_NEED_DEVLINK) {
                info->user_ptr[0] = devlink;
        } else if (ops->internal_flags & DEVLINK_NL_FLAG_NEED_PORT) {
-               struct devlink_port *devlink_port;
-
                devlink_port = devlink_port_get_from_info(devlink, info);
                if (IS_ERR(devlink_port)) {
                        err = PTR_ERR(devlink_port);
                        goto unlock;
                }
                info->user_ptr[0] = devlink_port;
+       } else if (ops->internal_flags & DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT) {
+               info->user_ptr[0] = devlink;
+               devlink_port = devlink_port_get_from_info(devlink, info);
+               if (!IS_ERR(devlink_port))
+                       info->user_ptr[1] = devlink_port;
        }
        if (ops->internal_flags & DEVLINK_NL_FLAG_NEED_SB) {
                struct devlink_sb *devlink_sb;
@@ -5287,6 +5292,7 @@ struct devlink_health_reporter {
        void *priv;
        const struct devlink_health_reporter_ops *ops;
        struct devlink *devlink;
+       struct devlink_port *devlink_port;
        struct devlink_fmsg *dump_fmsg;
        struct mutex dump_lock; /* lock parallel read/write from dump buffers */
        u64 graceful_period;
@@ -5332,6 +5338,15 @@ devlink_health_reporter_find_by_name(struct devlink *devlink,
 }
 
 static struct devlink_health_reporter *
+devlink_port_health_reporter_find_by_name(struct devlink_port *devlink_port,
+                                         const char *reporter_name)
+{
+       return __devlink_health_reporter_find_by_name(&devlink_port->reporter_list,
+                                                     &devlink_port->reporters_lock,
+                                                     reporter_name);
+}
+
+static struct devlink_health_reporter *
 __devlink_health_reporter_create(struct devlink *devlink,
                                 const struct devlink_health_reporter_ops *ops,
                                 u64 graceful_period, void *priv)
@@ -5443,6 +5458,10 @@ devlink_nl_health_reporter_fill(struct sk_buff *msg,
        if (devlink_nl_put_handle(msg, devlink))
                goto genlmsg_cancel;
 
+       if (reporter->devlink_port) {
+               if (nla_put_u32(msg, DEVLINK_ATTR_PORT_INDEX, reporter->devlink_port->index))
+                       goto genlmsg_cancel;
+       }
        reporter_attr = nla_nest_start_noflag(msg,
                                              DEVLINK_ATTR_HEALTH_REPORTER);
        if (!reporter_attr)
@@ -5650,17 +5669,28 @@ devlink_health_reporter_get_from_attrs(struct devlink *devlink,
                                       struct nlattr **attrs)
 {
        struct devlink_health_reporter *reporter;
+       struct devlink_port *devlink_port;
        char *reporter_name;
 
        if (!attrs[DEVLINK_ATTR_HEALTH_REPORTER_NAME])
                return NULL;
 
        reporter_name = nla_data(attrs[DEVLINK_ATTR_HEALTH_REPORTER_NAME]);
-       mutex_lock(&devlink->reporters_lock);
-       reporter = devlink_health_reporter_find_by_name(devlink, reporter_name);
-       if (reporter)
-               refcount_inc(&reporter->refcount);
-       mutex_unlock(&devlink->reporters_lock);
+       devlink_port = devlink_port_get_from_attrs(devlink, attrs);
+       if (IS_ERR(devlink_port)) {
+               mutex_lock(&devlink->reporters_lock);
+               reporter = devlink_health_reporter_find_by_name(devlink, reporter_name);
+               if (reporter)
+                       refcount_inc(&reporter->refcount);
+               mutex_unlock(&devlink->reporters_lock);
+       } else {
+               mutex_lock(&devlink_port->reporters_lock);
+               reporter = devlink_port_health_reporter_find_by_name(devlink_port, reporter_name);
+               if (reporter)
+                       refcount_inc(&reporter->refcount);
+               mutex_unlock(&devlink_port->reporters_lock);
+       }
+
        return reporter;
 }
 
@@ -5748,6 +5778,7 @@ devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
                                          struct netlink_callback *cb)
 {
        struct devlink_health_reporter *reporter;
+       struct devlink_port *port;
        struct devlink *devlink;
        int start = cb->args[0];
        int idx = 0;
@@ -5778,6 +5809,31 @@ devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
                }
                mutex_unlock(&devlink->reporters_lock);
        }
+
+       list_for_each_entry(devlink, &devlink_list, list) {
+               if (!net_eq(devlink_net(devlink), sock_net(msg->sk)))
+                       continue;
+               list_for_each_entry(port, &devlink->port_list, list) {
+                       mutex_lock(&port->reporters_lock);
+                       list_for_each_entry(reporter, &port->reporter_list, list) {
+                               if (idx < start) {
+                                       idx++;
+                                       continue;
+                               }
+                               err = devlink_nl_health_reporter_fill(msg, devlink, reporter,
+                                                                     DEVLINK_CMD_HEALTH_REPORTER_GET,
+                                                                     NETLINK_CB(cb->skb).portid,
+                                                                     cb->nlh->nlmsg_seq,
+                                                                     NLM_F_MULTI);
+                               if (err) {
+                                       mutex_unlock(&port->reporters_lock);
+                                       goto out;
+                               }
+                               idx++;
+                       }
+                       mutex_unlock(&port->reporters_lock);
+               }
+       }
 out:
        mutex_unlock(&devlink_mutex);
 
@@ -7157,7 +7213,7 @@ static const struct genl_ops devlink_nl_ops[] = {
                .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
                .doit = devlink_nl_cmd_health_reporter_get_doit,
                .dumpit = devlink_nl_cmd_health_reporter_get_dumpit,
-               .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK |
+               .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT |
                                  DEVLINK_NL_FLAG_NO_LOCK,
                /* can be retrieved by unprivileged users */
        },
@@ -7166,7 +7222,7 @@ static const struct genl_ops devlink_nl_ops[] = {
                .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
                .doit = devlink_nl_cmd_health_reporter_set_doit,
                .flags = GENL_ADMIN_PERM,
-               .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK |
+               .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT |
                                  DEVLINK_NL_FLAG_NO_LOCK,
        },
        {
@@ -7174,7 +7230,7 @@ static const struct genl_ops devlink_nl_ops[] = {
                .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
                .doit = devlink_nl_cmd_health_reporter_recover_doit,
                .flags = GENL_ADMIN_PERM,
-               .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK |
+               .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT |
                                  DEVLINK_NL_FLAG_NO_LOCK,
        },
        {
@@ -7182,7 +7238,7 @@ static const struct genl_ops devlink_nl_ops[] = {
                .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
                .doit = devlink_nl_cmd_health_reporter_diagnose_doit,
                .flags = GENL_ADMIN_PERM,
-               .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK |
+               .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT |
                                  DEVLINK_NL_FLAG_NO_LOCK,
        },
        {
@@ -7191,7 +7247,7 @@ static const struct genl_ops devlink_nl_ops[] = {
                            GENL_DONT_VALIDATE_DUMP_STRICT,
                .dumpit = devlink_nl_cmd_health_reporter_dump_get_dumpit,
                .flags = GENL_ADMIN_PERM,
-               .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK |
+               .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT |
                                  DEVLINK_NL_FLAG_NO_LOCK,
        },
        {
@@ -7199,7 +7255,7 @@ static const struct genl_ops devlink_nl_ops[] = {
                .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
                .doit = devlink_nl_cmd_health_reporter_dump_clear_doit,
                .flags = GENL_ADMIN_PERM,
-               .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK |
+               .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT |
                                  DEVLINK_NL_FLAG_NO_LOCK,
        },
        {
@@ -7459,6 +7515,8 @@ int devlink_port_register(struct devlink *devlink,
        list_add_tail(&devlink_port->list, &devlink->port_list);
        INIT_LIST_HEAD(&devlink_port->param_list);
        mutex_unlock(&devlink->lock);
+       INIT_LIST_HEAD(&devlink_port->reporter_list);
+       mutex_init(&devlink_port->reporters_lock);
        INIT_DELAYED_WORK(&devlink_port->type_warn_dw, &devlink_port_type_warn);
        devlink_port_type_warn_schedule(devlink_port);
        devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_NEW);
@@ -7475,6 +7533,8 @@ void devlink_port_unregister(struct devlink_port *devlink_port)
 {
        struct devlink *devlink = devlink_port->devlink;
 
+       WARN_ON(!list_empty(&devlink_port->reporter_list));
+       mutex_destroy(&devlink_port->reporters_lock);
        devlink_port_type_warn_cancel(devlink_port);
        devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_DEL);
        mutex_lock(&devlink->lock);