From nobody Sat Feb 7 05:20:33 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5B640C3DA78 for ; Tue, 17 Jan 2023 08:56:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235587AbjAQI4h (ORCPT ); Tue, 17 Jan 2023 03:56:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57990 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236158AbjAQI4N (ORCPT ); Tue, 17 Jan 2023 03:56:13 -0500 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.153.233]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 21D931816D; Tue, 17 Jan 2023 00:56:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1673945768; x=1705481768; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=GZcHBZbu5HtMonOR5Xd9wzrrmhkAZmUisdDYlTfIN/Q=; b=hRBUmQ8H6LpXSLw4Kv+zv/Z8cn0k4RKLXhcqWQHbMDxMMdhYiAty+nF6 8ahAHP9LGW03PtFeAbEvd/zrYUvITdyFXOnAWSQwWdOyr78veL+6eEKZg GbzLJ40xJ+w0lgp4Djy3ERlp/Avg0g3nFCNxE9hE3oe72CCUgum2Q9N7E vGNnH6ia+wyFd20Rep0idxdE86EEPWNgIoemCnW534o3DQWhoXF/k2JWN +QHZqsghh+gdCOmLEV987uTKW3Cdd3LRNjlXpF6nljlXPf/k+CWEmSUU/ ZzybWbrfj2N+7lBbvDAN3P0LCHDaUnc7iUppDdK4YuL5ZynFNDuu5asTb g==; X-IronPort-AV: E=Sophos;i="5.97,222,1669100400"; d="scan'208";a="197113715" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa5.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 17 Jan 2023 01:56:08 -0700 Received: from chn-vm-ex04.mchp-main.com (10.10.85.152) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.16; Tue, 17 Jan 2023 01:56:02 -0700 Received: from den-dk-m31857.microchip.com (10.10.115.15) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server id 15.1.2507.16 via Frontend Transport; Tue, 17 Jan 2023 01:55:58 -0700 From: Steen Hegelund To: "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni CC: Steen Hegelund , , Randy Dunlap , "Casper Andersson" , Russell King , Wan Jiabing , "Nathan Huckleberry" , , , , "Steen Hegelund" , Daniel Machon , Horatiu Vultur , Lars Povlsen , Dan Carpenter , Michael Walle Subject: [PATCH net-next 3/5] net: microchip: sparx5: Add VCAP admin locking in debugFS Date: Tue, 17 Jan 2023 09:55:42 +0100 Message-ID: <20230117085544.591523-4-steen.hegelund@microchip.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230117085544.591523-1-steen.hegelund@microchip.com> References: <20230117085544.591523-1-steen.hegelund@microchip.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" This ensures that the admin lock is taken before the debugFS functions starts iterating the VCAP rules. It also adds a separate function to decode a rule, which expects the lock to have been taken before it is called. Signed-off-by: Steen Hegelund --- .../net/ethernet/microchip/vcap/vcap_api.c | 60 ++++++++++--------- .../microchip/vcap/vcap_api_debugfs.c | 14 ++++- .../microchip/vcap/vcap_api_private.h | 3 + 3 files changed, 47 insertions(+), 30 deletions(-) diff --git a/drivers/net/ethernet/microchip/vcap/vcap_api.c b/drivers/net/e= thernet/microchip/vcap/vcap_api.c index f1dc4fd6bb96..198c36627ba1 100644 --- a/drivers/net/ethernet/microchip/vcap/vcap_api.c +++ b/drivers/net/ethernet/microchip/vcap/vcap_api.c @@ -2170,47 +2170,53 @@ void vcap_free_rule(struct vcap_rule *rule) } EXPORT_SYMBOL_GPL(vcap_free_rule); =20 -struct vcap_rule *vcap_get_rule(struct vcap_control *vctrl, u32 id) +/* Decode a rule from the VCAP cache and return a copy */ +struct vcap_rule *vcap_decode_rule(struct vcap_rule_internal *elem) { - struct vcap_rule_internal *elem; struct vcap_rule_internal *ri; int err; =20 - ri =3D NULL; - - err =3D vcap_api_check(vctrl); - if (err) - return ERR_PTR(err); - elem =3D vcap_lookup_rule(vctrl, id); - if (!elem) - return NULL; - mutex_lock(&elem->admin->lock); ri =3D vcap_dup_rule(elem, elem->state =3D=3D VCAP_RS_DISABLED); if (IS_ERR(ri)) - goto unlock; + return ERR_PTR(PTR_ERR(ri)); =20 if (ri->state =3D=3D VCAP_RS_DISABLED) - goto unlock; + goto out; =20 err =3D vcap_read_rule(ri); - if (err) { - ri =3D ERR_PTR(err); - goto unlock; - } + if (err) + return ERR_PTR(err); + err =3D vcap_decode_keyset(ri); - if (err) { - ri =3D ERR_PTR(err); - goto unlock; - } + if (err) + return ERR_PTR(err); + err =3D vcap_decode_actionset(ri); - if (err) { - ri =3D ERR_PTR(err); - goto unlock; - } + if (err) + return ERR_PTR(err); =20 -unlock: +out: + return &ri->data; +} + +struct vcap_rule *vcap_get_rule(struct vcap_control *vctrl, u32 id) +{ + struct vcap_rule_internal *elem; + struct vcap_rule *rule; + int err; + + err =3D vcap_api_check(vctrl); + if (err) + return ERR_PTR(err); + + elem =3D vcap_lookup_rule(vctrl, id); + if (!elem) + return NULL; + + mutex_lock(&elem->admin->lock); + rule =3D vcap_decode_rule(elem); mutex_unlock(&elem->admin->lock); - return (struct vcap_rule *)ri; + return rule; } EXPORT_SYMBOL_GPL(vcap_get_rule); =20 diff --git a/drivers/net/ethernet/microchip/vcap/vcap_api_debugfs.c b/drive= rs/net/ethernet/microchip/vcap/vcap_api_debugfs.c index dc06f6d4f513..d49b1cf7712f 100644 --- a/drivers/net/ethernet/microchip/vcap/vcap_api_debugfs.c +++ b/drivers/net/ethernet/microchip/vcap/vcap_api_debugfs.c @@ -295,7 +295,7 @@ static int vcap_show_admin(struct vcap_control *vctrl, =20 vcap_show_admin_info(vctrl, admin, out); list_for_each_entry(elem, &admin->rules, list) { - vrule =3D vcap_get_rule(vctrl, elem->data.id); + vrule =3D vcap_decode_rule(elem); if (IS_ERR_OR_NULL(vrule)) { ret =3D PTR_ERR(vrule); break; @@ -404,8 +404,12 @@ static int vcap_debugfs_show(struct seq_file *m, void = *unused) .prf =3D (void *)seq_printf, .dst =3D m, }; + int ret; =20 - return vcap_show_admin(info->vctrl, info->admin, &out); + mutex_lock(&info->admin->lock); + ret =3D vcap_show_admin(info->vctrl, info->admin, &out); + mutex_unlock(&info->admin->lock); + return ret; } DEFINE_SHOW_ATTRIBUTE(vcap_debugfs); =20 @@ -417,8 +421,12 @@ static int vcap_raw_debugfs_show(struct seq_file *m, v= oid *unused) .prf =3D (void *)seq_printf, .dst =3D m, }; + int ret; =20 - return vcap_show_admin_raw(info->vctrl, info->admin, &out); + mutex_lock(&info->admin->lock); + ret =3D vcap_show_admin_raw(info->vctrl, info->admin, &out); + mutex_unlock(&info->admin->lock); + return ret; } DEFINE_SHOW_ATTRIBUTE(vcap_raw_debugfs); =20 diff --git a/drivers/net/ethernet/microchip/vcap/vcap_api_private.h b/drive= rs/net/ethernet/microchip/vcap/vcap_api_private.h index 86542accffe6..df81d9ff502b 100644 --- a/drivers/net/ethernet/microchip/vcap/vcap_api_private.h +++ b/drivers/net/ethernet/microchip/vcap/vcap_api_private.h @@ -118,4 +118,7 @@ int vcap_find_keystream_keysets(struct vcap_control *vc= trl, enum vcap_type vt, /* Get the keysets that matches the rule key type/mask */ int vcap_rule_get_keysets(struct vcap_rule_internal *ri, struct vcap_keyset_list *matches); +/* Decode a rule from the VCAP cache and return a copy */ +struct vcap_rule *vcap_decode_rule(struct vcap_rule_internal *elem); + #endif /* __VCAP_API_PRIVATE__ */ --=20 2.39.0