From patchwork Wed Jul 7 11:25:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jussi Maki X-Patchwork-Id: 471159 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-20.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A16D5C07E95 for ; Wed, 7 Jul 2021 13:14:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 81FAA61A24 for ; Wed, 7 Jul 2021 13:14:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231800AbhGGNQp (ORCPT ); Wed, 7 Jul 2021 09:16:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51758 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231733AbhGGNQe (ORCPT ); Wed, 7 Jul 2021 09:16:34 -0400 Received: from mail-lj1-x234.google.com (mail-lj1-x234.google.com [IPv6:2a00:1450:4864:20::234]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 449AEC06175F; Wed, 7 Jul 2021 06:13:53 -0700 (PDT) Received: by mail-lj1-x234.google.com with SMTP id u25so2602994ljj.11; Wed, 07 Jul 2021 06:13:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=h25gHlOngZgr86BE+CbM0uJNam8WoUfeVATamHxArOw=; b=RXO8ymGzxfsEu2ttOuCke4ohRTFXlQktxVetUEhdx57MFwf10ngGBTlPxdiFhb0UPA d85N0+HjCqAtlB0gyYnX9x3LgBuuCgBQ5eUmHpQccGDD/mtjP7PJylSCjRKwloD4qmkq dXccUP8RutEDTXrcbFGnVYugRklUFengVt4OycsGn7ajbWLD6i4CGd5IVAylnrJBvyU5 hBScKyc/y1syBXpAZzEB7L1g25kcpcesreYJ9eZwLu+rZd7XUnR5KgE7mLVSX6QZsvLN mQXAMekNo5pezEPncekDFxQ4VFNJZXg5ny+r2EWWZbb4vpVQM6o13ai69fP6eoLHaman zKMA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=h25gHlOngZgr86BE+CbM0uJNam8WoUfeVATamHxArOw=; b=BeiCrMYK2fvhmi6G8UGzlqJHTHN/CrYxBLPL0JQD46T/0KUno54P1Faqj4Cz6sQd3/ Pzvd4+F1aS0kWRnrNaKUJUqeYYOB/bKsI1SJ1dVO+sHFVlTN0cCxIcQbKgJ5g561vGaG 4hmcKkYaGtGxsctgaCSWvGHeks+tbv8fWeo5edqQyWd0Igsbk9ERfABpBUoNh8DOQJ79 Nx5PAmSDGvF9CvBBIr0GaWiT1v30dcu5O/KVGBit4K19OnL8+l1t4K1Kht5h27xGrkb1 PbR/epJ1IGjqwvxiyIDf4YuTOKEHd64b0vBEbumXf5qPiDtH6qQaGnIERmRDHHDms2iH ED/w== X-Gm-Message-State: AOAM531aDomzKjVjNbuoslbm5V5VfHamUHRxgfsWlTR/L/t+MPPlvfgh zzOtxq2EN8zqv8bMJQw48DdX35rQCXbNHHCE1Q== X-Google-Smtp-Source: ABdhPJzC/+0kPktq84jrmOss4dX9lnay2HQ5PHuUtkFZew4yP9+HtEs4QL/0WJNnnChbVBT46ecUeA== X-Received: by 2002:a2e:b804:: with SMTP id u4mr2728465ljo.312.1625663631378; Wed, 07 Jul 2021 06:13:51 -0700 (PDT) Received: from localhost.localdomain ([89.42.43.188]) by smtp.gmail.com with ESMTPSA id u9sm1423571lfm.127.2021.07.07.06.13.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jul 2021 06:13:50 -0700 (PDT) From: Jussi Maki To: bpf@vger.kernel.org Cc: netdev@vger.kernel.org, daniel@iogearbox.net, j.vosburgh@gmail.com, andy@greyhouse.net, vfalico@gmail.com, andrii@kernel.org, maciej.fijalkowski@intel.com, magnus.karlsson@intel.com, Jussi Maki , toke@redhat.com Subject: [PATCH bpf-next v3 5/5] net: core: Allow netdev_lower_get_next_private_rcu in bh context Date: Wed, 7 Jul 2021 11:25:51 +0000 Message-Id: <20210707112551.9782-6-joamaki@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210707112551.9782-1-joamaki@gmail.com> References: <20210609135537.1460244-1-joamaki@gmail.com> <20210707112551.9782-1-joamaki@gmail.com> Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org For the XDP bonding slave lookup to work in the NAPI poll context in which the redudant rcu_read_lock() has been removed we have to follow the same approach as in [1] and modify the WARN_ON to also check rcu_read_lock_bh_held(). [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=694cea395fded425008e93cd90cfdf7a451674af Signed-off-by: Jussi Maki --- net/core/dev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/core/dev.c b/net/core/dev.c index 05aac85b2bbc..27f95aeddc59 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -7569,7 +7569,7 @@ void *netdev_lower_get_next_private_rcu(struct net_device *dev, { struct netdev_adjacent *lower; - WARN_ON_ONCE(!rcu_read_lock_held()); + WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_bh_held()); lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);