From patchwork Fri Feb 28 07:58:47 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Akihiko Odaki X-Patchwork-Id: 869471 Received: from mail-pl1-f182.google.com (mail-pl1-f182.google.com [209.85.214.182]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3C1251D618A for ; Fri, 28 Feb 2025 07:59:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740729548; cv=none; b=hx0tBRQfh/6R8a3AkzbXSv8dBwUn/sfOCK5SAnN5rjtdrlTSrvT09h4SN/MG3oYXDyNz0YuYWQckEYVyT6hRY4nL4eXbIP4QrSkgzSF4Mi1er0PcundYUc+uTAomVYi+CmuP3x/sN9P0nk8JRUHvQ3txBXhXAoQAsSZHSqc9VsE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740729548; c=relaxed/simple; bh=9YjLGgOgxjd7KI1w2ki+88OGAWpCNcVzyGfWquchPGU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To; b=Aom/GRxoWfDpXw0NXvZhSATs+81eEIzMHTFKaEGbcFaFQ/xPIlX9CueLquTHamHAHABQpoUPRZLRgyhSTeKE5arNUEyO82ZGLToruQbcn87FGlg91FWWoY90drDhq6IrlSaJnxSKj6HggtlqcDhzBtOvK+da6gmRcdxdnF/ZAbI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=daynix.com; spf=pass smtp.mailfrom=daynix.com; dkim=pass (2048-bit key) header.d=daynix-com.20230601.gappssmtp.com header.i=@daynix-com.20230601.gappssmtp.com header.b=LLGd/1b4; arc=none smtp.client-ip=209.85.214.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=daynix.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=daynix.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=daynix-com.20230601.gappssmtp.com header.i=@daynix-com.20230601.gappssmtp.com header.b="LLGd/1b4" Received: by mail-pl1-f182.google.com with SMTP id d9443c01a7336-2211cd4463cso34899035ad.2 for ; Thu, 27 Feb 2025 23:59:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=daynix-com.20230601.gappssmtp.com; s=20230601; t=1740729546; x=1741334346; darn=vger.kernel.org; h=to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=b/qC0mfXfemQxtgPVvB5yWxcCoCf7wtW10EiI7eK4rY=; b=LLGd/1b4J9e4rManhKFvZWbYz35lmXm5B8/zJ0dap34sVWV74mA0vWpm3JEIBssRyF 2DE66JUdaglylRMcVPJxpB/sOkSFwXx8YY9DFshINZ2SUeG/RJEBpIs/5ZEiwcEqmaFW epN0oFbsDMmppAdnnQCoKFS6dYo4HGcAubgEdNGpyov1sNL61TWjapPXex1zEGdF7RH9 fIrqRp04UbTT7Bfv/3vyPkspHi6nUnUYvXm39JB28NP++FqUSVk4OPJf/HPJysGkigvf sjQn1YXWynuttmjcCgtefvnORzcowYg0jZKE92jAyjQPBq7chezZj67ab+ZHX5XanuLU ZZRQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1740729546; x=1741334346; h=to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=b/qC0mfXfemQxtgPVvB5yWxcCoCf7wtW10EiI7eK4rY=; b=sKLy0Y0t+Ep1VoyVhB8+5JbeVqHR8InSXQRpOnoDU15HAZjw/SwG7yspBHGzM5TngL uvbcS7Z9CFCYFxxI+knG0dgpRZUnfCs5YpnlcdpwyxNAsSVHcR7wdrl+a00bgvnxWNqM knFm/XeVMkVWAcHEmjt6SuanJ8kUHHrZQz2TuvI50AjNjFnWPny/h3hiijHJ/++8K/xv bzcpZ2tUPwcxXMrtMAKOoCwkMo0SXzIx3XcUaw77uVbEgMti0CHQiolxewItbvfxeo0K VJYmPCVruC8Sb1D7ci4CBzMSyuonEfCT4XW+f/rP6DlN4bwitEPtzJXs8w4ffUpDHXqk W29w== X-Forwarded-Encrypted: i=1; AJvYcCXP+QaP6Q9Ngyiporm1LSz5bZt7UZ6w01JJ/2ZgQ3hSjv5bvHlSz5GvjfM+97TeYbAikJOeIETOkPnKwYxNDJk=@vger.kernel.org X-Gm-Message-State: AOJu0YxeopQUJN4A9MdRHjt3SXM2Tj1PmIBwonduG5w7IerAyuj9xjBP 8FOczVMnR1qzVVZxexShqa9SKEpYqDVDJvVS4kM789qIQl3z7t2MzIK28rSUqoQ= X-Gm-Gg: ASbGncsKZcvv7RADt5hZ7iID3hfo4v+JepjicuHVM10qZQADDuXFLtX8penR0XmmZAn 353SXjCO5feMJMXstjk4f5SAl+6cM2tL2hloRa3GNovJinvqeNx4M28QPYnCIF2O+wZKB+6XcCv SBgi2WOfRbk64tX1HzeFW5FPojiECZOyMtyFRXxtMSG+VAOwZaqXqlGHuPRpTeUKjRktthWqpYK 6+zznd5IXja63BqS2Y+siDvsi/wxxd75UK4npsso8cgivJJsWAUnc+lc6Urr22po2VRlOTCtp5k 11OtLC6j8TZ8svfu8s+BhQpu5QM5ag== X-Google-Smtp-Source: AGHT+IF1Xg+68dSCJKnZOpLjf5U8ezLtmxq9887nRnMHK8BWszc4/AKMNeey5X8hDppZM/bzXADEWQ== X-Received: by 2002:a05:6a21:3289:b0:1f0:e736:a92f with SMTP id adf61e73a8af0-1f2f4e17c94mr4095422637.31.1740729546642; Thu, 27 Feb 2025 23:59:06 -0800 (PST) Received: from localhost ([157.82.207.107]) by smtp.gmail.com with UTF8SMTPSA id d2e1a72fcca58-7349fe2a65asm3108342b3a.28.2025.02.27.23.59.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 27 Feb 2025 23:59:06 -0800 (PST) From: Akihiko Odaki Date: Fri, 28 Feb 2025 16:58:47 +0900 Subject: [PATCH net-next v7 1/6] virtio_net: Add functions for hashing Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250228-rss-v7-1-844205cbbdd6@daynix.com> References: <20250228-rss-v7-0-844205cbbdd6@daynix.com> In-Reply-To: <20250228-rss-v7-0-844205cbbdd6@daynix.com> To: Jonathan Corbet , Willem de Bruijn , Jason Wang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , "Michael S. Tsirkin" , Xuan Zhuo , Shuah Khan , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-kselftest@vger.kernel.org, Yuri Benditovich , Andrew Melnychenko , Stephen Hemminger , gur.stavi@huawei.com, Lei Yang , Akihiko Odaki X-Mailer: b4 0.14.2 They are useful to implement VIRTIO_NET_F_RSS and VIRTIO_NET_F_HASH_REPORT. Signed-off-by: Akihiko Odaki --- include/linux/virtio_net.h | 188 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 188 insertions(+) diff --git a/include/linux/virtio_net.h b/include/linux/virtio_net.h index 02a9f4dc594d02372a6c1850cd600eff9d000d8d..426f33b4b82440d61b2af9fdc4c0b0d4c571b2c5 100644 --- a/include/linux/virtio_net.h +++ b/include/linux/virtio_net.h @@ -9,6 +9,194 @@ #include #include +struct virtio_net_hash { + u32 value; + u16 report; +}; + +struct virtio_net_toeplitz_state { + u32 hash; + const u32 *key; +}; + +#define VIRTIO_NET_SUPPORTED_HASH_TYPES (VIRTIO_NET_RSS_HASH_TYPE_IPv4 | \ + VIRTIO_NET_RSS_HASH_TYPE_TCPv4 | \ + VIRTIO_NET_RSS_HASH_TYPE_UDPv4 | \ + VIRTIO_NET_RSS_HASH_TYPE_IPv6 | \ + VIRTIO_NET_RSS_HASH_TYPE_TCPv6 | \ + VIRTIO_NET_RSS_HASH_TYPE_UDPv6) + +#define VIRTIO_NET_RSS_MAX_KEY_SIZE 40 + +static inline void virtio_net_toeplitz_convert_key(u32 *input, size_t len) +{ + while (len >= sizeof(*input)) { + *input = be32_to_cpu((__force __be32)*input); + input++; + len -= sizeof(*input); + } +} + +static inline void virtio_net_toeplitz_calc(struct virtio_net_toeplitz_state *state, + const __be32 *input, size_t len) +{ + while (len >= sizeof(*input)) { + for (u32 map = be32_to_cpu(*input); map; map &= (map - 1)) { + u32 i = ffs(map); + + state->hash ^= state->key[0] << (32 - i) | + (u32)((u64)state->key[1] >> i); + } + + state->key++; + input++; + len -= sizeof(*input); + } +} + +static inline u8 virtio_net_hash_key_length(u32 types) +{ + size_t len = 0; + + if (types & VIRTIO_NET_HASH_REPORT_IPv4) + len = max(len, + sizeof(struct flow_dissector_key_ipv4_addrs)); + + if (types & + (VIRTIO_NET_HASH_REPORT_TCPv4 | VIRTIO_NET_HASH_REPORT_UDPv4)) + len = max(len, + sizeof(struct flow_dissector_key_ipv4_addrs) + + sizeof(struct flow_dissector_key_ports)); + + if (types & VIRTIO_NET_HASH_REPORT_IPv6) + len = max(len, + sizeof(struct flow_dissector_key_ipv6_addrs)); + + if (types & + (VIRTIO_NET_HASH_REPORT_TCPv6 | VIRTIO_NET_HASH_REPORT_UDPv6)) + len = max(len, + sizeof(struct flow_dissector_key_ipv6_addrs) + + sizeof(struct flow_dissector_key_ports)); + + return len + sizeof(u32); +} + +static inline u32 virtio_net_hash_report(u32 types, + const struct flow_keys_basic *keys) +{ + switch (keys->basic.n_proto) { + case cpu_to_be16(ETH_P_IP): + if (!(keys->control.flags & FLOW_DIS_IS_FRAGMENT)) { + if (keys->basic.ip_proto == IPPROTO_TCP && + (types & VIRTIO_NET_RSS_HASH_TYPE_TCPv4)) + return VIRTIO_NET_HASH_REPORT_TCPv4; + + if (keys->basic.ip_proto == IPPROTO_UDP && + (types & VIRTIO_NET_RSS_HASH_TYPE_UDPv4)) + return VIRTIO_NET_HASH_REPORT_UDPv4; + } + + if (types & VIRTIO_NET_RSS_HASH_TYPE_IPv4) + return VIRTIO_NET_HASH_REPORT_IPv4; + + return VIRTIO_NET_HASH_REPORT_NONE; + + case cpu_to_be16(ETH_P_IPV6): + if (!(keys->control.flags & FLOW_DIS_IS_FRAGMENT)) { + if (keys->basic.ip_proto == IPPROTO_TCP && + (types & VIRTIO_NET_RSS_HASH_TYPE_TCPv6)) + return VIRTIO_NET_HASH_REPORT_TCPv6; + + if (keys->basic.ip_proto == IPPROTO_UDP && + (types & VIRTIO_NET_RSS_HASH_TYPE_UDPv6)) + return VIRTIO_NET_HASH_REPORT_UDPv6; + } + + if (types & VIRTIO_NET_RSS_HASH_TYPE_IPv6) + return VIRTIO_NET_HASH_REPORT_IPv6; + + return VIRTIO_NET_HASH_REPORT_NONE; + + default: + return VIRTIO_NET_HASH_REPORT_NONE; + } +} + +static inline void virtio_net_hash_rss(const struct sk_buff *skb, + u32 types, const u32 *key, + struct virtio_net_hash *hash) +{ + struct virtio_net_toeplitz_state toeplitz_state = { .key = key }; + struct flow_keys flow; + struct flow_keys_basic flow_basic; + u16 report; + + if (!skb_flow_dissect_flow_keys(skb, &flow, 0)) { + hash->report = VIRTIO_NET_HASH_REPORT_NONE; + return; + } + + flow_basic = (struct flow_keys_basic) { + .control = flow.control, + .basic = flow.basic + }; + + report = virtio_net_hash_report(types, &flow_basic); + + switch (report) { + case VIRTIO_NET_HASH_REPORT_IPv4: + virtio_net_toeplitz_calc(&toeplitz_state, + (__be32 *)&flow.addrs.v4addrs, + sizeof(flow.addrs.v4addrs)); + break; + + case VIRTIO_NET_HASH_REPORT_TCPv4: + virtio_net_toeplitz_calc(&toeplitz_state, + (__be32 *)&flow.addrs.v4addrs, + sizeof(flow.addrs.v4addrs)); + virtio_net_toeplitz_calc(&toeplitz_state, &flow.ports.ports, + sizeof(flow.ports.ports)); + break; + + case VIRTIO_NET_HASH_REPORT_UDPv4: + virtio_net_toeplitz_calc(&toeplitz_state, + (__be32 *)&flow.addrs.v4addrs, + sizeof(flow.addrs.v4addrs)); + virtio_net_toeplitz_calc(&toeplitz_state, &flow.ports.ports, + sizeof(flow.ports.ports)); + break; + + case VIRTIO_NET_HASH_REPORT_IPv6: + virtio_net_toeplitz_calc(&toeplitz_state, + (__be32 *)&flow.addrs.v6addrs, + sizeof(flow.addrs.v6addrs)); + break; + + case VIRTIO_NET_HASH_REPORT_TCPv6: + virtio_net_toeplitz_calc(&toeplitz_state, + (__be32 *)&flow.addrs.v6addrs, + sizeof(flow.addrs.v6addrs)); + virtio_net_toeplitz_calc(&toeplitz_state, &flow.ports.ports, + sizeof(flow.ports.ports)); + break; + + case VIRTIO_NET_HASH_REPORT_UDPv6: + virtio_net_toeplitz_calc(&toeplitz_state, + (__be32 *)&flow.addrs.v6addrs, + sizeof(flow.addrs.v6addrs)); + virtio_net_toeplitz_calc(&toeplitz_state, &flow.ports.ports, + sizeof(flow.ports.ports)); + break; + + default: + hash->report = VIRTIO_NET_HASH_REPORT_NONE; + return; + } + + hash->value = toeplitz_state.hash; + hash->report = report; +} + static inline bool virtio_net_hdr_match_proto(__be16 protocol, __u8 gso_type) { switch (gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {