From patchwork Mon Aug 5 11:35:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Chapman X-Patchwork-Id: 13753530 X-Patchwork-Delegate: kuba@kernel.org Received: from mail.katalix.com (mail.katalix.com [3.9.82.81]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4B3ED156899 for ; Mon, 5 Aug 2024 11:35:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=3.9.82.81 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722857745; cv=none; b=d358uuxedzisyT2Eavlm730wyA8+hBcHao9OUx/+WpI26212JULbwhHms0T3U5M6KD8uIc0UmMnyVIe193ZTJ5snR9ZMbkpJoYMcGTmi7UphhmhP+bpmq8T9EIl5fys/etDuqhVqESlIibrqtEi6Tv3u0tyV6IJLe02+muTrPCg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722857745; c=relaxed/simple; bh=UGmYbzdEP46W6aef/lev8O8MCSxyWHI8lHWr6WfMUIU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=t3YOpeht5ofig1gCI9HFDZiH0J9B3wuGzG3Cxl0MHfrdKlXpD+MZtLzSaszDkB4xChKpfoZ/ZvAioaI2lDlzb+vEW4oC4L8gAmKaftc/44XhIT/Houi4fKUvuAAOPyuuLAhGLpi5y+IeRv1ZCW9VPh05ghSEZwZDOkB9bCFMe+4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=katalix.com; spf=pass smtp.mailfrom=katalix.com; dkim=pass (2048-bit key) header.d=katalix.com header.i=@katalix.com header.b=m+4Up1tS; arc=none smtp.client-ip=3.9.82.81 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=katalix.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=katalix.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=katalix.com header.i=@katalix.com header.b="m+4Up1tS" Received: from katalix.com (unknown [IPv6:2a02:8010:6359:1:326:9405:f27f:a659]) (Authenticated sender: james) by mail.katalix.com (Postfix) with ESMTPSA id 77CD47DD02; Mon, 5 Aug 2024 12:35:35 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=katalix.com; s=mail; t=1722857735; bh=UGmYbzdEP46W6aef/lev8O8MCSxyWHI8lHWr6WfMUIU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:From; z=From:=20James=20Chapman=20|To:=20netdev@vge r.kernel.org|Cc:=20davem@davemloft.net,=0D=0A=09edumazet@google.co m,=0D=0A=09kuba@kernel.org,=0D=0A=09pabeni@redhat.com,=0D=0A=09dsa hern@kernel.org,=0D=0A=09tparkin@katalix.com|Subject:=20[PATCH=20n et-next=205/9]=20l2tp:=20use=20get_next=20APIs=20for=20management= 20requests=20and=20procfs/debugfs|Date:=20Mon,=20=205=20Aug=202024 =2012:35:29=20+0100|Message-Id:=20|In-Reply-To:=20|References:=20|MIME-Version:=201.0; b=m+4Up1tS5cX5pKVB3TXBg7+zyELZ4Ve04qzSoC5V+NVxCmHs0EUpePfcFrN4shBma RdI7Fb8r4/vkaDTMfUD8LFPbp0Rl9e46qlSlei7JVVdept3C+EPpv7/6Xe7fBjkASh wet3Nk47sQmlJzf74QFRzNoeq5Azqol7JNBDDJ6PsS6rykmP6mDKZFILqQGd5qGGf9 uJCIG4pm2oPOTWUnuSgvAJxVqDYwRsHc4Mv3ZATDzYl+OmqMNP8KIog4H0cYodAqKe FV9/Rp/e9W97Z/kJIkIc1lV8N5Lb2Vbs6rVRIExQnonFPYe62q0CqhWwP14TDF/cye tOYyI93HqeKZQ== From: James Chapman To: netdev@vger.kernel.org Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, dsahern@kernel.org, tparkin@katalix.com Subject: [PATCH net-next 5/9] l2tp: use get_next APIs for management requests and procfs/debugfs Date: Mon, 5 Aug 2024 12:35:29 +0100 Message-Id: X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org l2tp netlink and procfs/debugfs iterate over tunnel and session lists to obtain data. They currently use very inefficient get_nth functions to do so. Replace these with get_next. For netlink, use nl cb->ctx[] for passing state instead of the obsolete cb->args[]. l2tp_tunnel_get_nth and l2tp_session_get_nth are no longer used so they can be removed. Signed-off-by: James Chapman Signed-off-by: Tom Parkin --- net/l2tp/l2tp_core.c | 40 ---------------------------------------- net/l2tp/l2tp_core.h | 2 -- net/l2tp/l2tp_debugfs.c | 16 +++++++++------- net/l2tp/l2tp_netlink.c | 34 +++++++++++++++++++++------------- net/l2tp/l2tp_ppp.c | 16 +++++++++------- 5 files changed, 39 insertions(+), 69 deletions(-) diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c index 05e388490cd9..52a367270779 100644 --- a/net/l2tp/l2tp_core.c +++ b/net/l2tp/l2tp_core.c @@ -236,27 +236,6 @@ struct l2tp_tunnel *l2tp_tunnel_get(const struct net *net, u32 tunnel_id) } EXPORT_SYMBOL_GPL(l2tp_tunnel_get); -struct l2tp_tunnel *l2tp_tunnel_get_nth(const struct net *net, int nth) -{ - struct l2tp_net *pn = l2tp_pernet(net); - unsigned long tunnel_id, tmp; - struct l2tp_tunnel *tunnel; - int count = 0; - - rcu_read_lock_bh(); - idr_for_each_entry_ul(&pn->l2tp_tunnel_idr, tunnel, tmp, tunnel_id) { - if (tunnel && ++count > nth && - refcount_inc_not_zero(&tunnel->ref_count)) { - rcu_read_unlock_bh(); - return tunnel; - } - } - rcu_read_unlock_bh(); - - return NULL; -} -EXPORT_SYMBOL_GPL(l2tp_tunnel_get_nth); - struct l2tp_tunnel *l2tp_tunnel_get_next(const struct net *net, unsigned long *key) { struct l2tp_net *pn = l2tp_pernet(net); @@ -350,25 +329,6 @@ struct l2tp_session *l2tp_session_get(const struct net *net, struct sock *sk, in } EXPORT_SYMBOL_GPL(l2tp_session_get); -struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth) -{ - struct l2tp_session *session; - int count = 0; - - rcu_read_lock_bh(); - list_for_each_entry_rcu(session, &tunnel->session_list, list) { - if (++count > nth) { - l2tp_session_inc_refcount(session); - rcu_read_unlock_bh(); - return session; - } - } - rcu_read_unlock_bh(); - - return NULL; -} -EXPORT_SYMBOL_GPL(l2tp_session_get_nth); - static struct l2tp_session *l2tp_v2_session_get_next(const struct net *net, u16 tid, unsigned long *key) { struct l2tp_net *pn = l2tp_pernet(net); diff --git a/net/l2tp/l2tp_core.h b/net/l2tp/l2tp_core.h index cc464982a7d9..0fabacffc3f3 100644 --- a/net/l2tp/l2tp_core.h +++ b/net/l2tp/l2tp_core.h @@ -219,14 +219,12 @@ void l2tp_session_dec_refcount(struct l2tp_session *session); * the caller must ensure that the reference is dropped appropriately. */ struct l2tp_tunnel *l2tp_tunnel_get(const struct net *net, u32 tunnel_id); -struct l2tp_tunnel *l2tp_tunnel_get_nth(const struct net *net, int nth); struct l2tp_tunnel *l2tp_tunnel_get_next(const struct net *net, unsigned long *key); struct l2tp_session *l2tp_v3_session_get(const struct net *net, struct sock *sk, u32 session_id); struct l2tp_session *l2tp_v2_session_get(const struct net *net, u16 tunnel_id, u16 session_id); struct l2tp_session *l2tp_session_get(const struct net *net, struct sock *sk, int pver, u32 tunnel_id, u32 session_id); -struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth); struct l2tp_session *l2tp_session_get_next(const struct net *net, struct sock *sk, int pver, u32 tunnel_id, unsigned long *key); struct l2tp_session *l2tp_session_get_by_ifname(const struct net *net, diff --git a/net/l2tp/l2tp_debugfs.c b/net/l2tp/l2tp_debugfs.c index 8755ae521154..b2134b57ed18 100644 --- a/net/l2tp/l2tp_debugfs.c +++ b/net/l2tp/l2tp_debugfs.c @@ -34,8 +34,8 @@ static struct dentry *rootdir; struct l2tp_dfs_seq_data { struct net *net; netns_tracker ns_tracker; - int tunnel_idx; /* current tunnel */ - int session_idx; /* index of session within current tunnel */ + unsigned long tkey; /* lookup key of current tunnel */ + unsigned long skey; /* lookup key of current session */ struct l2tp_tunnel *tunnel; struct l2tp_session *session; /* NULL means get next tunnel */ }; @@ -46,8 +46,8 @@ static void l2tp_dfs_next_tunnel(struct l2tp_dfs_seq_data *pd) if (pd->tunnel) l2tp_tunnel_dec_refcount(pd->tunnel); - pd->tunnel = l2tp_tunnel_get_nth(pd->net, pd->tunnel_idx); - pd->tunnel_idx++; + pd->tunnel = l2tp_tunnel_get_next(pd->net, &pd->tkey); + pd->tkey++; } static void l2tp_dfs_next_session(struct l2tp_dfs_seq_data *pd) @@ -56,11 +56,13 @@ static void l2tp_dfs_next_session(struct l2tp_dfs_seq_data *pd) if (pd->session) l2tp_session_dec_refcount(pd->session); - pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx); - pd->session_idx++; + pd->session = l2tp_session_get_next(pd->net, pd->tunnel->sock, + pd->tunnel->version, + pd->tunnel->tunnel_id, &pd->skey); + pd->skey++; if (!pd->session) { - pd->session_idx = 0; + pd->skey = 0; l2tp_dfs_next_tunnel(pd); } } diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c index fc43ecbd128c..0598b97a0bca 100644 --- a/net/l2tp/l2tp_netlink.c +++ b/net/l2tp/l2tp_netlink.c @@ -491,14 +491,20 @@ static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info) return ret; } +struct l2tp_nl_cb_data { + unsigned long tkey; + unsigned long skey; +}; + static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb) { - int ti = cb->args[0]; + struct l2tp_nl_cb_data *cbd = (void *)&cb->ctx[0]; + unsigned long key = cbd->tkey; struct l2tp_tunnel *tunnel; struct net *net = sock_net(skb->sk); for (;;) { - tunnel = l2tp_tunnel_get_nth(net, ti); + tunnel = l2tp_tunnel_get_next(net, &key); if (!tunnel) goto out; @@ -510,11 +516,11 @@ static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback } l2tp_tunnel_dec_refcount(tunnel); - ti++; + key++; } out: - cb->args[0] = ti; + cbd->tkey = key; return skb->len; } @@ -832,25 +838,27 @@ static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info) static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb) { + struct l2tp_nl_cb_data *cbd = (void *)&cb->ctx[0]; struct net *net = sock_net(skb->sk); struct l2tp_session *session; struct l2tp_tunnel *tunnel = NULL; - int ti = cb->args[0]; - int si = cb->args[1]; + unsigned long tkey = cbd->tkey; + unsigned long skey = cbd->skey; for (;;) { if (!tunnel) { - tunnel = l2tp_tunnel_get_nth(net, ti); + tunnel = l2tp_tunnel_get_next(net, &tkey); if (!tunnel) goto out; } - session = l2tp_session_get_nth(tunnel, si); + session = l2tp_session_get_next(net, tunnel->sock, tunnel->version, + tunnel->tunnel_id, &skey); if (!session) { - ti++; + tkey++; l2tp_tunnel_dec_refcount(tunnel); tunnel = NULL; - si = 0; + skey = 0; continue; } @@ -863,12 +871,12 @@ static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback } l2tp_session_dec_refcount(session); - si++; + skey++; } out: - cb->args[0] = ti; - cb->args[1] = si; + cbd->tkey = tkey; + cbd->skey = skey; return skb->len; } diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c index 9b4273fd518a..c1d9dcaa0426 100644 --- a/net/l2tp/l2tp_ppp.c +++ b/net/l2tp/l2tp_ppp.c @@ -1397,8 +1397,8 @@ static int pppol2tp_getsockopt(struct socket *sock, int level, int optname, struct pppol2tp_seq_data { struct seq_net_private p; - int tunnel_idx; /* current tunnel */ - int session_idx; /* index of session within current tunnel */ + unsigned long tkey; /* lookup key of current tunnel */ + unsigned long skey; /* lookup key of current session */ struct l2tp_tunnel *tunnel; struct l2tp_session *session; /* NULL means get next tunnel */ }; @@ -1410,8 +1410,8 @@ static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd) l2tp_tunnel_dec_refcount(pd->tunnel); for (;;) { - pd->tunnel = l2tp_tunnel_get_nth(net, pd->tunnel_idx); - pd->tunnel_idx++; + pd->tunnel = l2tp_tunnel_get_next(net, &pd->tkey); + pd->tkey++; /* Only accept L2TPv2 tunnels */ if (!pd->tunnel || pd->tunnel->version == 2) @@ -1427,11 +1427,13 @@ static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd) if (pd->session) l2tp_session_dec_refcount(pd->session); - pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx); - pd->session_idx++; + pd->session = l2tp_session_get_next(net, pd->tunnel->sock, + pd->tunnel->version, + pd->tunnel->tunnel_id, &pd->skey); + pd->skey++; if (!pd->session) { - pd->session_idx = 0; + pd->skey = 0; pppol2tp_next_tunnel(net, pd); } }