From 4a1b5aa8b5c7433ad6e0c8b52469980ae94a4398 Mon Sep 17 00:00:00 2001 From: Jiri Pirko Date: Fri, 11 Aug 2023 17:57:11 +0200 Subject: [PATCH] devlink: allow user to narrow per-instance dumps by passing handle attrs For SFs, one devlink instance per SF is created. There might be thousands of these on a single host. When a user needs to know port handle for specific SF, he needs to dump all devlink ports on the host which does not scale good. Allow user to pass devlink handle attributes alongside the dump command and dump only objects which are under selected devlink instance. Example: $ devlink port show auxiliary/mlx5_core.eth.0/65535: type eth netdev eth2 flavour physical port 0 splittable false auxiliary/mlx5_core.eth.1/131071: type eth netdev eth3 flavour physical port 1 splittable false $ devlink port show auxiliary/mlx5_core.eth.0 auxiliary/mlx5_core.eth.0/65535: type eth netdev eth2 flavour physical port 0 splittable false $ devlink port show auxiliary/mlx5_core.eth.1 auxiliary/mlx5_core.eth.1/131071: type eth netdev eth3 flavour physical port 1 splittable false Signed-off-by: Jiri Pirko Acked-by: Jakub Kicinski Link: https://lore.kernel.org/r/20230811155714.1736405-11-jiri@resnulli.us Signed-off-by: Jakub Kicinski --- net/devlink/netlink.c | 43 ++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 40 insertions(+), 3 deletions(-) diff --git a/net/devlink/netlink.c b/net/devlink/netlink.c index 47e44fb..a9b43b0 100644 --- a/net/devlink/netlink.c +++ b/net/devlink/netlink.c @@ -170,8 +170,30 @@ void devlink_nl_post_doit(const struct genl_split_ops *ops, devlink_put(devlink); } -int devlink_nl_dumpit(struct sk_buff *msg, struct netlink_callback *cb, - devlink_nl_dump_one_func_t *dump_one) +static int devlink_nl_inst_single_dumpit(struct sk_buff *msg, + struct netlink_callback *cb, int flags, + devlink_nl_dump_one_func_t *dump_one, + struct nlattr **attrs) +{ + struct devlink *devlink; + int err; + + devlink = devlink_get_from_attrs_lock(sock_net(msg->sk), attrs); + if (IS_ERR(devlink)) + return PTR_ERR(devlink); + err = dump_one(msg, devlink, cb, flags | NLM_F_DUMP_FILTERED); + + devl_unlock(devlink); + devlink_put(devlink); + + if (err != -EMSGSIZE) + return err; + return msg->len; +} + +static int devlink_nl_inst_iter_dumpit(struct sk_buff *msg, + struct netlink_callback *cb, int flags, + devlink_nl_dump_one_func_t *dump_one) { struct devlink_nl_dump_state *state = devlink_dump_state(cb); struct devlink *devlink; @@ -182,7 +204,7 @@ int devlink_nl_dumpit(struct sk_buff *msg, struct netlink_callback *cb, devl_lock(devlink); if (devl_is_registered(devlink)) - err = dump_one(msg, devlink, cb, NLM_F_MULTI); + err = dump_one(msg, devlink, cb, flags); else err = 0; @@ -203,6 +225,21 @@ int devlink_nl_dumpit(struct sk_buff *msg, struct netlink_callback *cb, return msg->len; } +int devlink_nl_dumpit(struct sk_buff *msg, struct netlink_callback *cb, + devlink_nl_dump_one_func_t *dump_one) +{ + const struct genl_dumpit_info *info = genl_dumpit_info(cb); + struct nlattr **attrs = info->attrs; + int flags = NLM_F_MULTI; + + if (attrs && + (attrs[DEVLINK_ATTR_BUS_NAME] || attrs[DEVLINK_ATTR_DEV_NAME])) + return devlink_nl_inst_single_dumpit(msg, cb, flags, dump_one, + attrs); + else + return devlink_nl_inst_iter_dumpit(msg, cb, flags, dump_one); +} + struct genl_family devlink_nl_family __ro_after_init = { .name = DEVLINK_GENL_NAME, .version = DEVLINK_GENL_VERSION, -- 2.7.4