From c5e1bf8a51cfe5060e91c7533098e329c0118f6d Mon Sep 17 00:00:00 2001 From: Jiri Pirko Date: Wed, 13 Sep 2023 09:12:42 +0200 Subject: [PATCH] devlink: introduce possibility to expose info about nested devlinks In mlx5, there is a devlink instance created for PCI device. Also, one separate devlink instance is created for auxiliary device that represents the netdev of uplink port. This relation is currently invisible to the devlink user. Benefit from the rel infrastructure and allow for nested devlink instance to set the relationship for the nested-in devlink instance. Note that there may be many nested instances, therefore use xarray to hold the list of rel_indexes for individual nested instances. Signed-off-by: Jiri Pirko Signed-off-by: David S. Miller --- include/net/devlink.h | 2 ++ net/devlink/core.c | 2 ++ net/devlink/dev.c | 49 +++++++++++++++++++++++++++++++++++++ net/devlink/devl_internal.h | 1 + 4 files changed, 54 insertions(+) diff --git a/include/net/devlink.h b/include/net/devlink.h index 0dfcd7d7fa18a..fad8e36e3d988 100644 --- a/include/net/devlink.h +++ b/include/net/devlink.h @@ -1921,6 +1921,8 @@ devlink_health_reporter_state_update(struct devlink_health_reporter *reporter, void devlink_health_reporter_recovery_done(struct devlink_health_reporter *reporter); +int devl_nested_devlink_set(struct devlink *devlink, + struct devlink *nested_devlink); bool devlink_is_reload_failed(const struct devlink *devlink); void devlink_remote_reload_actions_performed(struct devlink *devlink, enum devlink_reload_limit limit, diff --git a/net/devlink/core.c b/net/devlink/core.c index 2a98ff9a2f6b5..bcbbb952569f5 100644 --- a/net/devlink/core.c +++ b/net/devlink/core.c @@ -430,6 +430,7 @@ struct devlink *devlink_alloc_ns(const struct devlink_ops *ops, xa_init_flags(&devlink->ports, XA_FLAGS_ALLOC); xa_init_flags(&devlink->params, XA_FLAGS_ALLOC); xa_init_flags(&devlink->snapshot_ids, XA_FLAGS_ALLOC); + xa_init_flags(&devlink->nested_rels, XA_FLAGS_ALLOC); write_pnet(&devlink->_net, net); INIT_LIST_HEAD(&devlink->rate_list); INIT_LIST_HEAD(&devlink->linecard_list); @@ -476,6 +477,7 @@ void devlink_free(struct devlink *devlink) WARN_ON(!list_empty(&devlink->linecard_list)); WARN_ON(!xa_empty(&devlink->ports)); + xa_destroy(&devlink->nested_rels); xa_destroy(&devlink->snapshot_ids); xa_destroy(&devlink->params); xa_destroy(&devlink->ports); diff --git a/net/devlink/dev.c b/net/devlink/dev.c index 3ae26d9088ab3..dc8039ca2b388 100644 --- a/net/devlink/dev.c +++ b/net/devlink/dev.c @@ -138,6 +138,23 @@ devlink_reload_stats_put(struct sk_buff *msg, struct devlink *devlink, bool is_r return -EMSGSIZE; } +static int devlink_nl_nested_fill(struct sk_buff *msg, struct devlink *devlink) +{ + unsigned long rel_index; + void *unused; + int err; + + xa_for_each(&devlink->nested_rels, rel_index, unused) { + err = devlink_rel_devlink_handle_put(msg, devlink, + rel_index, + DEVLINK_ATTR_NESTED_DEVLINK, + NULL); + if (err) + return err; + } + return 0; +} + static int devlink_nl_fill(struct sk_buff *msg, struct devlink *devlink, enum devlink_command cmd, u32 portid, u32 seq, int flags) @@ -164,6 +181,10 @@ static int devlink_nl_fill(struct sk_buff *msg, struct devlink *devlink, goto dev_stats_nest_cancel; nla_nest_end(msg, dev_stats); + + if (devlink_nl_nested_fill(msg, devlink)) + goto nla_put_failure; + genlmsg_end(msg, hdr); return 0; @@ -230,6 +251,34 @@ int devlink_nl_get_dumpit(struct sk_buff *msg, struct netlink_callback *cb) return devlink_nl_dumpit(msg, cb, devlink_nl_get_dump_one); } +static void devlink_rel_notify_cb(struct devlink *devlink, u32 obj_index) +{ + devlink_notify(devlink, DEVLINK_CMD_NEW); +} + +static void devlink_rel_cleanup_cb(struct devlink *devlink, u32 obj_index, + u32 rel_index) +{ + xa_erase(&devlink->nested_rels, rel_index); +} + +int devl_nested_devlink_set(struct devlink *devlink, + struct devlink *nested_devlink) +{ + u32 rel_index; + int err; + + err = devlink_rel_nested_in_add(&rel_index, devlink->index, 0, + devlink_rel_notify_cb, + devlink_rel_cleanup_cb, + nested_devlink); + if (err) + return err; + return xa_insert(&devlink->nested_rels, rel_index, + xa_mk_value(0), GFP_KERNEL); +} +EXPORT_SYMBOL_GPL(devl_nested_devlink_set); + void devlink_notify_register(struct devlink *devlink) { devlink_notify(devlink, DEVLINK_CMD_NEW); diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h index 4cb534aff44db..741d1bf1bec88 100644 --- a/net/devlink/devl_internal.h +++ b/net/devlink/devl_internal.h @@ -58,6 +58,7 @@ struct devlink { refcount_t refcount; struct rcu_work rwork; struct devlink_rel *rel; + struct xarray nested_rels; char priv[] __aligned(NETDEV_ALIGN); };