From cddbff470e3318834af518168d3a917b6e975062 Mon Sep 17 00:00:00 2001 From: Jiri Pirko Date: Sat, 16 Dec 2023 13:29:55 +0100 Subject: [PATCH] devlink: send notifications only if there are listeners Introduce devlink_nl_notify_need() helper and using it to check at the beginning of notification functions to avoid overhead of composing notification messages in case nobody listens. Signed-off-by: Jiri Pirko Signed-off-by: Paolo Abeni --- net/devlink/dev.c | 5 ++++- net/devlink/devl_internal.h | 6 ++++++ net/devlink/health.c | 3 +++ net/devlink/linecard.c | 2 +- net/devlink/param.c | 2 +- net/devlink/port.c | 2 +- net/devlink/rate.c | 2 +- net/devlink/region.c | 2 +- net/devlink/trap.c | 6 +++--- 9 files changed, 21 insertions(+), 9 deletions(-) diff --git a/net/devlink/dev.c b/net/devlink/dev.c index 3fe93c8a9fe2..63fe3e02c928 100644 --- a/net/devlink/dev.c +++ b/net/devlink/dev.c @@ -204,6 +204,9 @@ static void devlink_notify(struct devlink *devlink, enum devlink_command cmd) WARN_ON(cmd != DEVLINK_CMD_NEW && cmd != DEVLINK_CMD_DEL); WARN_ON(!devl_is_registered(devlink)); + if (!devlink_nl_notify_need(devlink)) + return; + msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); if (!msg) return; @@ -999,7 +1002,7 @@ static void __devlink_flash_update_notify(struct devlink *devlink, cmd != DEVLINK_CMD_FLASH_UPDATE_END && cmd != DEVLINK_CMD_FLASH_UPDATE_STATUS); - if (!devl_is_registered(devlink)) + if (!devl_is_registered(devlink) || !devlink_nl_notify_need(devlink)) return; msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h index 59ae4761d10a..510990de094e 100644 --- a/net/devlink/devl_internal.h +++ b/net/devlink/devl_internal.h @@ -185,6 +185,12 @@ int devlink_nl_put_nested_handle(struct sk_buff *msg, struct net *net, struct devlink *devlink, int attrtype); int devlink_nl_msg_reply_and_new(struct sk_buff **msg, struct genl_info *info); +static inline bool devlink_nl_notify_need(struct devlink *devlink) +{ + return genl_has_listeners(&devlink_nl_family, devlink_net(devlink), + DEVLINK_MCGRP_CONFIG); +} + /* Notify */ void devlink_notify_register(struct devlink *devlink); void devlink_notify_unregister(struct devlink *devlink); diff --git a/net/devlink/health.c b/net/devlink/health.c index 71ae121dc739..0795dcf22ca8 100644 --- a/net/devlink/health.c +++ b/net/devlink/health.c @@ -496,6 +496,9 @@ static void devlink_recover_notify(struct devlink_health_reporter *reporter, WARN_ON(cmd != DEVLINK_CMD_HEALTH_REPORTER_RECOVER); ASSERT_DEVLINK_REGISTERED(devlink); + if (!devlink_nl_notify_need(devlink)) + return; + msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); if (!msg) return; diff --git a/net/devlink/linecard.c b/net/devlink/linecard.c index 9d080ac1734b..45b36975ee6f 100644 --- a/net/devlink/linecard.c +++ b/net/devlink/linecard.c @@ -136,7 +136,7 @@ static void devlink_linecard_notify(struct devlink_linecard *linecard, WARN_ON(cmd != DEVLINK_CMD_LINECARD_NEW && cmd != DEVLINK_CMD_LINECARD_DEL); - if (!__devl_is_registered(devlink)) + if (!__devl_is_registered(devlink) || !devlink_nl_notify_need(devlink)) return; msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); diff --git a/net/devlink/param.c b/net/devlink/param.c index d74df09311a9..7516b524ffb7 100644 --- a/net/devlink/param.c +++ b/net/devlink/param.c @@ -343,7 +343,7 @@ static void devlink_param_notify(struct devlink *devlink, * will replay the notifications if the params are added/removed * outside of the lifetime of the instance. */ - if (!devl_is_registered(devlink)) + if (!devl_is_registered(devlink) || !devlink_nl_notify_need(devlink)) return; msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); diff --git a/net/devlink/port.c b/net/devlink/port.c index f229a8699214..32f4d0331e63 100644 --- a/net/devlink/port.c +++ b/net/devlink/port.c @@ -512,7 +512,7 @@ static void devlink_port_notify(struct devlink_port *devlink_port, WARN_ON(cmd != DEVLINK_CMD_PORT_NEW && cmd != DEVLINK_CMD_PORT_DEL); - if (!__devl_is_registered(devlink)) + if (!__devl_is_registered(devlink) || !devlink_nl_notify_need(devlink)) return; msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); diff --git a/net/devlink/rate.c b/net/devlink/rate.c index e2190cf22beb..0371a2dd3e0a 100644 --- a/net/devlink/rate.c +++ b/net/devlink/rate.c @@ -146,7 +146,7 @@ static void devlink_rate_notify(struct devlink_rate *devlink_rate, WARN_ON(cmd != DEVLINK_CMD_RATE_NEW && cmd != DEVLINK_CMD_RATE_DEL); - if (!devl_is_registered(devlink)) + if (!devl_is_registered(devlink) || !devlink_nl_notify_need(devlink)) return; msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); diff --git a/net/devlink/region.c b/net/devlink/region.c index b65181aa269a..bf61312f64bd 100644 --- a/net/devlink/region.c +++ b/net/devlink/region.c @@ -235,7 +235,7 @@ static void devlink_nl_region_notify(struct devlink_region *region, WARN_ON(cmd != DEVLINK_CMD_REGION_NEW && cmd != DEVLINK_CMD_REGION_DEL); - if (!__devl_is_registered(devlink)) + if (!__devl_is_registered(devlink) || !devlink_nl_notify_need(devlink)) return; msg = devlink_nl_region_notify_build(region, snapshot, cmd, 0, 0); diff --git a/net/devlink/trap.c b/net/devlink/trap.c index 908085e2c990..3ca1ca7e2e64 100644 --- a/net/devlink/trap.c +++ b/net/devlink/trap.c @@ -1174,7 +1174,7 @@ devlink_trap_group_notify(struct devlink *devlink, WARN_ON_ONCE(cmd != DEVLINK_CMD_TRAP_GROUP_NEW && cmd != DEVLINK_CMD_TRAP_GROUP_DEL); - if (!devl_is_registered(devlink)) + if (!devl_is_registered(devlink) || !devlink_nl_notify_need(devlink)) return; msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); @@ -1236,7 +1236,7 @@ static void devlink_trap_notify(struct devlink *devlink, WARN_ON_ONCE(cmd != DEVLINK_CMD_TRAP_NEW && cmd != DEVLINK_CMD_TRAP_DEL); - if (!devl_is_registered(devlink)) + if (!devl_is_registered(devlink) || !devlink_nl_notify_need(devlink)) return; msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); @@ -1713,7 +1713,7 @@ devlink_trap_policer_notify(struct devlink *devlink, WARN_ON_ONCE(cmd != DEVLINK_CMD_TRAP_POLICER_NEW && cmd != DEVLINK_CMD_TRAP_POLICER_DEL); - if (!devl_is_registered(devlink)) + if (!devl_is_registered(devlink) || !devlink_nl_notify_need(devlink)) return; msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);