From patchwork Mon Feb 17 10:12:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vlad Buslov X-Patchwork-Id: 1239094 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=mellanox.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 48Lftl6b8wz9sP7 for ; Mon, 17 Feb 2020 21:12:47 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729193AbgBQKMr (ORCPT ); Mon, 17 Feb 2020 05:12:47 -0500 Received: from mail-il-dmz.mellanox.com ([193.47.165.129]:38586 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729086AbgBQKMq (ORCPT ); Mon, 17 Feb 2020 05:12:46 -0500 Received: from Internal Mail-Server by MTLPINE1 (envelope-from vladbu@mellanox.com) with ESMTPS (AES256-SHA encrypted); 17 Feb 2020 12:12:38 +0200 Received: from reg-r-vrt-018-180.mtr.labs.mlnx. (reg-r-vrt-018-180.mtr.labs.mlnx [10.215.1.1]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id 01HACcAO017557; Mon, 17 Feb 2020 12:12:38 +0200 From: Vlad Buslov To: netdev@vger.kernel.org, davem@davemloft.net Cc: jhs@mojatatu.com, xiyou.wangcong@gmail.com, jiri@resnulli.us, pablo@netfilter.org, marcelo.leitner@gmail.com, Vlad Buslov , Jiri Pirko Subject: [RESEND PATCH net-next 1/4] net: sched: lock action when translating it to flow_action infra Date: Mon, 17 Feb 2020 12:12:09 +0200 Message-Id: <20200217101212.5979-2-vladbu@mellanox.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200217101212.5979-1-vladbu@mellanox.com> References: <20200217101212.5979-1-vladbu@mellanox.com> MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org In order to remove dependency on rtnl lock, take action's tcfa_lock when constructing its representation as flow_action_entry structure. Refactor tcf_sample_get_group() to assume that caller holds tcf_lock and don't take it manually. This callback is only called from flow_action infra representation translator which now calls it with tcf_lock held, so this refactoring is necessary to prevent deadlock. Allocate memory with GFP_ATOMIC flag for ip_tunnel_info copy because tcf_tunnel_info_copy() is only called from flow_action representation infra code with tcf_lock spinlock taken. Signed-off-by: Vlad Buslov Acked-by: Jiri Pirko --- include/net/tc_act/tc_tunnel_key.h | 2 +- net/sched/act_sample.c | 2 -- net/sched/cls_api.c | 17 +++++++++++------ 3 files changed, 12 insertions(+), 9 deletions(-) diff --git a/include/net/tc_act/tc_tunnel_key.h b/include/net/tc_act/tc_tunnel_key.h index 0689d9bcdf84..2b3df076e5b6 100644 --- a/include/net/tc_act/tc_tunnel_key.h +++ b/include/net/tc_act/tc_tunnel_key.h @@ -69,7 +69,7 @@ tcf_tunnel_info_copy(const struct tc_action *a) if (tun) { size_t tun_size = sizeof(*tun) + tun->options_len; struct ip_tunnel_info *tun_copy = kmemdup(tun, tun_size, - GFP_KERNEL); + GFP_ATOMIC); return tun_copy; } diff --git a/net/sched/act_sample.c b/net/sched/act_sample.c index ce948c1e24dc..5e2df590bb58 100644 --- a/net/sched/act_sample.c +++ b/net/sched/act_sample.c @@ -267,14 +267,12 @@ tcf_sample_get_group(const struct tc_action *a, struct tcf_sample *s = to_sample(a); struct psample_group *group; - spin_lock_bh(&s->tcf_lock); group = rcu_dereference_protected(s->psample_group, lockdep_is_held(&s->tcf_lock)); if (group) { psample_group_take(group); *destructor = tcf_psample_group_put; } - spin_unlock_bh(&s->tcf_lock); return group; } diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c index c2cdd0fc2e70..610505117780 100644 --- a/net/sched/cls_api.c +++ b/net/sched/cls_api.c @@ -3435,7 +3435,7 @@ static void tcf_sample_get_group(struct flow_action_entry *entry, int tc_setup_flow_action(struct flow_action *flow_action, const struct tcf_exts *exts, bool rtnl_held) { - const struct tc_action *act; + struct tc_action *act; int i, j, k, err = 0; if (!exts) @@ -3449,6 +3449,7 @@ int tc_setup_flow_action(struct flow_action *flow_action, struct flow_action_entry *entry; entry = &flow_action->entries[j]; + spin_lock_bh(&act->tcfa_lock); if (is_tcf_gact_ok(act)) { entry->id = FLOW_ACTION_ACCEPT; } else if (is_tcf_gact_shot(act)) { @@ -3489,13 +3490,13 @@ int tc_setup_flow_action(struct flow_action *flow_action, break; default: err = -EOPNOTSUPP; - goto err_out; + goto err_out_locked; } } else if (is_tcf_tunnel_set(act)) { entry->id = FLOW_ACTION_TUNNEL_ENCAP; err = tcf_tunnel_encap_get_tunnel(entry, act); if (err) - goto err_out; + goto err_out_locked; } else if (is_tcf_tunnel_release(act)) { entry->id = FLOW_ACTION_TUNNEL_DECAP; } else if (is_tcf_pedit(act)) { @@ -3509,7 +3510,7 @@ int tc_setup_flow_action(struct flow_action *flow_action, break; default: err = -EOPNOTSUPP; - goto err_out; + goto err_out_locked; } entry->mangle.htype = tcf_pedit_htype(act, k); entry->mangle.mask = tcf_pedit_mask(act, k); @@ -3560,15 +3561,16 @@ int tc_setup_flow_action(struct flow_action *flow_action, entry->mpls_mangle.ttl = tcf_mpls_ttl(act); break; default: - goto err_out; + goto err_out_locked; } } else if (is_tcf_skbedit_ptype(act)) { entry->id = FLOW_ACTION_PTYPE; entry->ptype = tcf_skbedit_ptype(act); } else { err = -EOPNOTSUPP; - goto err_out; + goto err_out_locked; } + spin_unlock_bh(&act->tcfa_lock); if (!is_tcf_pedit(act)) j++; @@ -3582,6 +3584,9 @@ int tc_setup_flow_action(struct flow_action *flow_action, tc_cleanup_flow_action(flow_action); return err; +err_out_locked: + spin_unlock_bh(&act->tcfa_lock); + goto err_out; } EXPORT_SYMBOL(tc_setup_flow_action);