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Message-ID: <20230816234303.3786178-11-kuba@kernel.org> Date: Wed, 16 Aug 2023 16:42:59 -0700 From: Jakub Kicinski <kuba@...nel.org> To: netdev@...r.kernel.org Cc: hawk@...nel.org, ilias.apalodimas@...aro.org, aleksander.lobakin@...el.com, linyunsheng@...wei.com, almasrymina@...gle.com, Jakub Kicinski <kuba@...nel.org> Subject: [RFC net-next 10/13] net: page_pool: add netlink notifications for state changes Generate netlink notifications about page pool state changes. Signed-off-by: Jakub Kicinski <kuba@...nel.org> --- Documentation/netlink/specs/netdev.yaml | 17 ++++++++++++ include/uapi/linux/netdev.h | 4 +++ net/core/netdev-genl-gen.c | 1 + net/core/netdev-genl-gen.h | 1 + net/core/page_pool_user.c | 36 +++++++++++++++++++++++++ 5 files changed, 59 insertions(+) diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml index ded77e61df7b..47ae2a45daea 100644 --- a/Documentation/netlink/specs/netdev.yaml +++ b/Documentation/netlink/specs/netdev.yaml @@ -142,8 +142,25 @@ name: netdev - napi-id dump: reply: *pp-reply + - + name: page-pool-add-ntf + doc: Notification about page pool appearing. + notify: page-pool-get + mcgrp: page-pool + - + name: page-pool-del-ntf + doc: Notification about page pool disappearing. + notify: page-pool-get + mcgrp: page-pool + - + name: page-pool-change-ntf + doc: Notification about page pool configuration being changed. + notify: page-pool-get + mcgrp: page-pool mcast-groups: list: - name: mgmt + - + name: page-pool diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h index 98999e0650a3..3c9818c1962a 100644 --- a/include/uapi/linux/netdev.h +++ b/include/uapi/linux/netdev.h @@ -64,11 +64,15 @@ enum { NETDEV_CMD_DEV_DEL_NTF, NETDEV_CMD_DEV_CHANGE_NTF, NETDEV_CMD_PAGE_POOL_GET, + NETDEV_CMD_PAGE_POOL_ADD_NTF, + NETDEV_CMD_PAGE_POOL_DEL_NTF, + NETDEV_CMD_PAGE_POOL_CHANGE_NTF, __NETDEV_CMD_MAX, NETDEV_CMD_MAX = (__NETDEV_CMD_MAX - 1) }; #define NETDEV_MCGRP_MGMT "mgmt" +#define NETDEV_MCGRP_PAGE_POOL "page-pool" #endif /* _UAPI_LINUX_NETDEV_H */ diff --git a/net/core/netdev-genl-gen.c b/net/core/netdev-genl-gen.c index c74fe69dd241..23d5bd111ddd 100644 --- a/net/core/netdev-genl-gen.c +++ b/net/core/netdev-genl-gen.c @@ -50,6 +50,7 @@ static const struct genl_split_ops netdev_nl_ops[] = { static const struct genl_multicast_group netdev_nl_mcgrps[] = { [NETDEV_NLGRP_MGMT] = { "mgmt", }, + [NETDEV_NLGRP_PAGE_POOL] = { "page-pool", }, }; struct genl_family netdev_nl_family __ro_after_init = { diff --git a/net/core/netdev-genl-gen.h b/net/core/netdev-genl-gen.h index a011d12abff4..738097847100 100644 --- a/net/core/netdev-genl-gen.h +++ b/net/core/netdev-genl-gen.h @@ -19,6 +19,7 @@ int netdev_nl_page_pool_get_dumpit(struct sk_buff *skb, enum { NETDEV_NLGRP_MGMT, + NETDEV_NLGRP_PAGE_POOL, }; extern struct genl_family netdev_nl_family; diff --git a/net/core/page_pool_user.c b/net/core/page_pool_user.c index 3bc434f7825f..ba2f27f15495 100644 --- a/net/core/page_pool_user.c +++ b/net/core/page_pool_user.c @@ -135,6 +135,37 @@ page_pool_nl_fill(struct sk_buff *rsp, const struct page_pool *pool, 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 @@ int page_pool_list(struct page_pool *pool) 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); @@ -212,6 +246,8 @@ static void page_pool_unreg_netdev(struct net_device *netdev) mutex_lock(&page_pools_lock); 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; } -- 2.41.0
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