From patchwork Tue Oct 17 04:09:22 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Akihiko Odaki X-Patchwork-Id: 1849677 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=daynix-com.20230601.gappssmtp.com header.i=@daynix-com.20230601.gappssmtp.com header.a=rsa-sha256 header.s=20230601 header.b=K1/ED3Z8; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4S8gXr64jkz20Zj for ; Tue, 17 Oct 2023 15:11:56 +1100 (AEDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qsbPh-0007mB-TG; Tue, 17 Oct 2023 00:10:37 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qsbPg-0007k3-Fp for qemu-devel@nongnu.org; Tue, 17 Oct 2023 00:10:36 -0400 Received: from mail-pg1-x52d.google.com ([2607:f8b0:4864:20::52d]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qsbPe-0004ei-UM for qemu-devel@nongnu.org; Tue, 17 Oct 2023 00:10:36 -0400 Received: by mail-pg1-x52d.google.com with SMTP id 41be03b00d2f7-53fa455cd94so3431767a12.2 for ; Mon, 16 Oct 2023 21:10:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=daynix-com.20230601.gappssmtp.com; s=20230601; t=1697515833; x=1698120633; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=4suv/BvTtFCyaarl96M7QPK/UCb253pLYJ0sJd7urgg=; b=K1/ED3Z8JneFZYKFufj4veoZ/RvnfA43KgrAIyhhT/YsaiKx/CG3E7fFtAG/NSKoT6 j98+RCPRFk4yFE1JO92jFj0LPLQjOJTIJIIj1h2KzvdDJPgLFyuvbKr8zAoMgomhrZzm i1Rd45kwg2jQpuTHv/kWSlSiARHNqKqlE/w4Y0I+H0LxN0l+12j/IcG+CAFc3htpbpLu E5ek6wXFkt+3B9m3drSc0hwm1nWXbjE3pKhIp//OcwCaYlKzyeNZDKWX9fYkZIlnxcdn R6Jq29xmbB4grvtlXPxoj7bBoQgUpNSRv0IbtvEse9KxJEgCLbnxn1ubcJNQSVfidJgp h9Gg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697515833; x=1698120633; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=4suv/BvTtFCyaarl96M7QPK/UCb253pLYJ0sJd7urgg=; b=jxT0FmC3pJCUQcb0morfz68zwijPHKurGUOEvv/qU50m5QM1dvuxTPrmIDLsunoiwb f1p4j5IlEhVV0KBGLWrkynp2bgyS5lTSkmuWmwdVL4gHgB86xDeGLNW32v4/AN/J3sd7 DI9cZisMtNV8Vln1tXnMtF1PcHi8D/JmRfRmQ5TWeWXi6fsGWeHEyGa12Vt7jsCOIzCy X+ir7LXs7P/PEWk5WSPiqHzHaV1l34gadYPv1/HPndLGCa3Uk+pJSlYkCMXG8djZ7Nob QpiIjIgHJubxx1Haw+rVs2qsS02aNe5kfUxyBCHCaUQpt9elkJtjouAS0ihTdhzOefCI sroA== X-Gm-Message-State: AOJu0Ywe7y+o6EXfpqzQ0oxg8DgarhJHAIYoAw2xz5SjyKDPcd2fdEP5 sHN7lTX//ONMzNJAq2ht8Ue9dNHzkEmJxpowUkLUvg== X-Google-Smtp-Source: AGHT+IE4U3qmFXJuqsdmim1Nwi6afi8Wc+Hcm4Bh6lE4e4d+/RS+IuPNIWKdHLj/HMkURux9KPC1Rg== X-Received: by 2002:a05:6a20:4306:b0:174:af85:91fc with SMTP id h6-20020a056a20430600b00174af8591fcmr1101396pzk.48.1697515832147; Mon, 16 Oct 2023 21:10:32 -0700 (PDT) Received: from localhost ([2400:4050:a840:1e00:78d2:b862:10a7:d486]) by smtp.gmail.com with UTF8SMTPSA id v7-20020a170902b7c700b001c9ba6c7287sm392543plz.143.2023.10.16.21.10.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 16 Oct 2023 21:10:31 -0700 (PDT) From: Akihiko Odaki To: Cc: qemu-devel@nongnu.org, Yuri Benditovich , Andrew Melnychenko , "Michael S . Tsirkin" , Jason Wang , Akihiko Odaki Subject: [PATCH v5 16/21] ebpf: Fix RSS error handling Date: Tue, 17 Oct 2023 13:09:22 +0900 Message-ID: <20231017040932.62997-17-akihiko.odaki@daynix.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231017040932.62997-1-akihiko.odaki@daynix.com> References: <20231017040932.62997-1-akihiko.odaki@daynix.com> MIME-Version: 1.0 Received-SPF: none client-ip=2607:f8b0:4864:20::52d; envelope-from=akihiko.odaki@daynix.com; helo=mail-pg1-x52d.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org calculate_rss_hash() was using hash value 0 to tell if it calculated a hash, but the hash value may be 0 on a rare occasion. Have a distinct bool value for correctness. Fixes: f3fa412de2 ("ebpf: Added eBPF RSS program.") Signed-off-by: Akihiko Odaki --- tools/ebpf/rss.bpf.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) diff --git a/tools/ebpf/rss.bpf.c b/tools/ebpf/rss.bpf.c index 20f227e2ac..667ea6899e 100644 --- a/tools/ebpf/rss.bpf.c +++ b/tools/ebpf/rss.bpf.c @@ -377,18 +377,19 @@ error: return err; } -static inline __u32 calculate_rss_hash(struct __sk_buff *skb, - struct rss_config_t *config, struct toeplitz_key_data_t *toe) +static inline bool calculate_rss_hash(struct __sk_buff *skb, + struct rss_config_t *config, + struct toeplitz_key_data_t *toe, + __u32 *result) { __u8 rss_input[HASH_CALCULATION_BUFFER_SIZE] = {}; size_t bytes_written = 0; - __u32 result = 0; int err = 0; struct packet_hash_info_t packet_info = {}; err = parse_packet(skb, &packet_info); if (err) { - return 0; + return false; } if (packet_info.is_ipv4) { @@ -521,11 +522,13 @@ static inline __u32 calculate_rss_hash(struct __sk_buff *skb, } } - if (bytes_written) { - net_toeplitz_add(&result, rss_input, bytes_written, toe); + if (!bytes_written) { + return false; } - return result; + net_toeplitz_add(result, rss_input, bytes_written, toe); + + return true; } SEC("tun_rss_steering") @@ -546,8 +549,7 @@ int tun_rss_steering_prog(struct __sk_buff *skb) return config->default_queue; } - hash = calculate_rss_hash(skb, config, toe); - if (hash) { + if (calculate_rss_hash(skb, config, toe, &hash)) { __u32 table_idx = hash % config->indirections_len; __u16 *queue = 0;