From d2ef6aa077bdd0b3495dba5dcae6d3f19579b20b Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Sun, 26 Nov 2023 15:07:35 -0800 Subject: net: page_pool: add netlink notifications for state changes Generate netlink notifications about page pool state changes. Reviewed-by: Eric Dumazet Acked-by: Jesper Dangaard Brouer Signed-off-by: Jakub Kicinski Signed-off-by: Paolo Abeni --- net/core/page_pool_user.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) (limited to 'net/core/page_pool_user.c') diff --git a/net/core/page_pool_user.c b/net/core/page_pool_user.c index 7eb37c31fce9..1577fef880c9 100644 --- a/net/core/page_pool_user.c +++ b/net/core/page_pool_user.c @@ -135,6 +135,37 @@ err_cancel: return -EMSGSIZE; } +static void netdev_nl_page_pool_event(const struct page_pool *pool, u32 cmd) +{ + struct genl_info info; + struct sk_buff *ntf; + struct net *net; + + lockdep_assert_held(&page_pools_lock); + + /* 'invisible' page pools don't matter */ + if (hlist_unhashed(&pool->user.list)) + return; + net = dev_net(pool->slow.netdev); + + if (!genl_has_listeners(&netdev_nl_family, net, NETDEV_NLGRP_PAGE_POOL)) + return; + + genl_info_init_ntf(&info, &netdev_nl_family, cmd); + + ntf = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!ntf) + return; + + if (page_pool_nl_fill(ntf, pool, &info)) { + nlmsg_free(ntf); + return; + } + + genlmsg_multicast_netns(&netdev_nl_family, net, ntf, + 0, NETDEV_NLGRP_PAGE_POOL, GFP_KERNEL); +} + int netdev_nl_page_pool_get_doit(struct sk_buff *skb, struct genl_info *info) { u32 id; @@ -168,6 +199,8 @@ int page_pool_list(struct page_pool *pool) hlist_add_head(&pool->user.list, &pool->slow.netdev->page_pools); pool->user.napi_id = pool->p.napi ? pool->p.napi->napi_id : 0; + + netdev_nl_page_pool_event(pool, NETDEV_CMD_PAGE_POOL_ADD_NTF); } mutex_unlock(&page_pools_lock); @@ -181,6 +214,7 @@ err_unlock: void page_pool_unlist(struct page_pool *pool) { mutex_lock(&page_pools_lock); + netdev_nl_page_pool_event(pool, NETDEV_CMD_PAGE_POOL_DEL_NTF); xa_erase(&page_pools, pool->user.id); hlist_del(&pool->user.list); mutex_unlock(&page_pools_lock); @@ -210,6 +244,8 @@ static void page_pool_unreg_netdev(struct net_device *netdev) last = NULL; hlist_for_each_entry(pool, &netdev->page_pools, user.list) { pool->slow.netdev = lo; + netdev_nl_page_pool_event(pool, + NETDEV_CMD_PAGE_POOL_CHANGE_NTF); last = pool; } if (last) -- cgit v1.2.3