From patchwork Tue Feb 22 22:47:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Luiz Angelo Daros de Luca X-Patchwork-Id: 12756026 X-Patchwork-Delegate: kuba@kernel.org 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 2DB6EC433EF for ; Tue, 22 Feb 2022 22:48:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236147AbiBVWtL (ORCPT ); Tue, 22 Feb 2022 17:49:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41976 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231479AbiBVWtK (ORCPT ); Tue, 22 Feb 2022 17:49:10 -0500 Received: from mail-oo1-xc36.google.com (mail-oo1-xc36.google.com [IPv6:2607:f8b0:4864:20::c36]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 54F2F132979 for ; Tue, 22 Feb 2022 14:48:44 -0800 (PST) Received: by mail-oo1-xc36.google.com with SMTP id 189-20020a4a03c6000000b003179d7b30d8so19798917ooi.2 for ; Tue, 22 Feb 2022 14:48:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=RqUc8fD+HHtM8kdUtKtgqezvjPTrevAz75LlGqQji4k=; b=NUdKMLcJxKZoThV/K06TcFaI6faQqL1Td9lwyB6dsgeC6TqSmZSFG11ZsEQc/gNBe0 6dPT+iGnUseTHNbYjSR0RS8o/zX4MhHj2Z7fjeoUP7t2RxQHXG1dWOmfoaZCSJFkW4i3 HvLXK/emyy3tc56gt0hoEQe7HSad2pUMbqrX31tlaaTfCTZxo5/jEZVQLMzS+4feUPYT yJpPBadYXysAir1RjoQU1FgNp1LLZ5/y7alQDKJaROSq8FMAaiZkDeOjZvNcSjFxekBh 2wH52+y67L7F8Yvx1/7vG2Wde8IA650qMhIKnsMJHTf69rWf8jUQHnOdvgOReoKghyRD 0QVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=RqUc8fD+HHtM8kdUtKtgqezvjPTrevAz75LlGqQji4k=; b=WqeV7X9xerNoWNsVSsNZNLahpyRjVJNO4OM1rJLgqZs+Hq1fddvnxbiLeZuccq8nR+ VQjOHYxafPrpFCxhBqQLPz1tmWlTNmAQUaVX44KrG1M0HHTB0xmKXalN2t2XG96wKnGi mFnOdsdULzcsJzUgy2+jben2MlH7oRsCmDcyAPRBECpc2hCA2cI/Mq35LGn6nqf/zI9z uSQzbiJFmYWAOhRuq+h91WyEingIf56yKZFzo+OBUUXfsSFGHB2oC5m08Nr9ycrB5hpz 1HqyLjXAox2zByCleUOuU+ezOHIqsWcfS8UhFoLKGjH+Q2ng5OjECd0GIGLUMPi8qla6 tC6g== X-Gm-Message-State: AOAM5300GWE0aR48E6e9lXGmLgPwISbGpAzcdBc2V0LQS11jlvFpX/UR fMAS46AX3hXJC/bkugY/dN84DtnqdlTGoA== X-Google-Smtp-Source: ABdhPJzAgecbJ6jyy1YtAaT6fWKx7FL7bCdcjaQmbS1O3Tfy6Js/z1K8JyMvXRM5VfI/u1DeB931Pw== X-Received: by 2002:a05:6870:ed89:b0:c6:3f95:8f53 with SMTP id fz9-20020a056870ed8900b000c63f958f53mr2699727oab.269.1645570123393; Tue, 22 Feb 2022 14:48:43 -0800 (PST) Received: from tresc043793.tre-sc.gov.br ([187.94.103.218]) by smtp.gmail.com with ESMTPSA id c9sm7033380otd.26.2022.02.22.14.48.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Feb 2022 14:48:42 -0800 (PST) From: Luiz Angelo Daros de Luca To: netdev@vger.kernel.org Cc: linus.walleij@linaro.org, andrew@lunn.ch, vivien.didelot@gmail.com, f.fainelli@gmail.com, olteanv@gmail.com, davem@davemloft.net, kuba@kernel.org, alsi@bang-olufsen.dk, arinc.unal@arinc9.com, Luiz Angelo Daros de Luca Subject: [PATCH net-next v3 1/2] net: dsa: tag_rtl8_4: add rtl8_4t trailing variant Date: Tue, 22 Feb 2022 19:47:57 -0300 Message-Id: <20220222224758.11324-2-luizluca@gmail.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220222224758.11324-1-luizluca@gmail.com> References: <20220222224758.11324-1-luizluca@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Realtek switches supports the same tag both before ethertype or between payload and the CRC. Signed-off-by: Luiz Angelo Daros de Luca Reviewed-by: Alvin Šipraga --- include/net/dsa.h | 2 + net/dsa/tag_rtl8_4.c | 154 +++++++++++++++++++++++++++++++++---------- 2 files changed, 121 insertions(+), 35 deletions(-) diff --git a/include/net/dsa.h b/include/net/dsa.h index fd1f62a6e0a8..b688ced04b0e 100644 --- a/include/net/dsa.h +++ b/include/net/dsa.h @@ -52,6 +52,7 @@ struct phylink_link_state; #define DSA_TAG_PROTO_BRCM_LEGACY_VALUE 22 #define DSA_TAG_PROTO_SJA1110_VALUE 23 #define DSA_TAG_PROTO_RTL8_4_VALUE 24 +#define DSA_TAG_PROTO_RTL8_4T_VALUE 25 enum dsa_tag_protocol { DSA_TAG_PROTO_NONE = DSA_TAG_PROTO_NONE_VALUE, @@ -79,6 +80,7 @@ enum dsa_tag_protocol { DSA_TAG_PROTO_SEVILLE = DSA_TAG_PROTO_SEVILLE_VALUE, DSA_TAG_PROTO_SJA1110 = DSA_TAG_PROTO_SJA1110_VALUE, DSA_TAG_PROTO_RTL8_4 = DSA_TAG_PROTO_RTL8_4_VALUE, + DSA_TAG_PROTO_RTL8_4T = DSA_TAG_PROTO_RTL8_4T_VALUE, }; struct dsa_switch; diff --git a/net/dsa/tag_rtl8_4.c b/net/dsa/tag_rtl8_4.c index 02686ad4045d..2e81ab49d928 100644 --- a/net/dsa/tag_rtl8_4.c +++ b/net/dsa/tag_rtl8_4.c @@ -9,11 +9,6 @@ * * This tag header has the following format: * - * ------------------------------------------- - * | MAC DA | MAC SA | 8 byte tag | Type | ... - * ------------------------------------------- - * _______________/ \______________________________________ - * / \ * 0 7|8 15 * |-----------------------------------+-----------------------------------|--- * | (16-bit) | ^ @@ -58,6 +53,28 @@ * TX/RX | TX (switch->CPU): port number the packet was received on * | RX (CPU->switch): forwarding port mask (if ALLOW=0) * | allowance port mask (if ALLOW=1) + * + * The tag can be positioned before Ethertype, using tag "rtl8_4": + * + * +--------+--------+------------+------+----- + * | MAC DA | MAC SA | 8 byte tag | Type | ... + * +--------+--------+------------+------+----- + * + * If checksum offload is enabled for CPU port device, it might break if the + * driver does not use csum_start/csum_offset. + * + * The tag can also appear between the end of the payload and before the CRC, + * using tag "rtl8_4t": + * + * +--------+--------+------+-----+---------+------------+-----+ + * | MAC DA | MAC SA | TYPE | ... | payload | 8-byte tag | CRC | + * +--------+--------+------+-----+---------+------------+-----+ + * + * The added bytes after the payload will break most checksums, either in + * software or hardware. To avoid this issue, if the checksum is still pending, + * this tagger checksum the packet before adding the tag, rendering any + * checksum offload useless. + * */ #include @@ -84,87 +101,133 @@ #define RTL8_4_TX GENMASK(3, 0) #define RTL8_4_RX GENMASK(10, 0) -static struct sk_buff *rtl8_4_tag_xmit(struct sk_buff *skb, - struct net_device *dev) +static void rtl8_4_write_tag(struct sk_buff *skb, struct net_device *dev, + void *tag) { struct dsa_port *dp = dsa_slave_to_port(dev); - __be16 *tag; - - skb_push(skb, RTL8_4_TAG_LEN); - - dsa_alloc_etype_header(skb, RTL8_4_TAG_LEN); - tag = dsa_etype_header_pos_tx(skb); + __be16 tag16[RTL8_4_TAG_LEN / 2]; /* Set Realtek EtherType */ - tag[0] = htons(ETH_P_REALTEK); + tag16[0] = htons(ETH_P_REALTEK); /* Set Protocol; zero REASON */ - tag[1] = htons(FIELD_PREP(RTL8_4_PROTOCOL, RTL8_4_PROTOCOL_RTL8365MB)); + tag16[1] = htons(FIELD_PREP(RTL8_4_PROTOCOL, RTL8_4_PROTOCOL_RTL8365MB)); /* Zero FID_EN, FID, PRI_EN, PRI, KEEP; set LEARN_DIS */ - tag[2] = htons(FIELD_PREP(RTL8_4_LEARN_DIS, 1)); + tag16[2] = htons(FIELD_PREP(RTL8_4_LEARN_DIS, 1)); /* Zero ALLOW; set RX (CPU->switch) forwarding port mask */ - tag[3] = htons(FIELD_PREP(RTL8_4_RX, BIT(dp->index))); + tag16[3] = htons(FIELD_PREP(RTL8_4_RX, BIT(dp->index))); + + memcpy(tag, tag16, RTL8_4_TAG_LEN); +} + +static struct sk_buff *rtl8_4_tag_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + skb_push(skb, RTL8_4_TAG_LEN); + + dsa_alloc_etype_header(skb, RTL8_4_TAG_LEN); + + rtl8_4_write_tag(skb, dev, dsa_etype_header_pos_tx(skb)); return skb; } -static struct sk_buff *rtl8_4_tag_rcv(struct sk_buff *skb, - struct net_device *dev) +static struct sk_buff *rtl8_4t_tag_xmit(struct sk_buff *skb, + struct net_device *dev) { - __be16 *tag; + /* Calculate the checksum here if not done yet as trailing tags will + * break either software and hardware based checksum + */ + if (skb->ip_summed == CHECKSUM_PARTIAL && skb_checksum_help(skb)) + return NULL; + + rtl8_4_write_tag(skb, dev, skb_put(skb, RTL8_4_TAG_LEN)); + + return skb; +} + +static int rtl8_4_read_tag(struct sk_buff *skb, struct net_device *dev, + void *tag) +{ + __be16 tag16[RTL8_4_TAG_LEN / 2]; u16 etype; u8 reason; u8 proto; u8 port; - if (unlikely(!pskb_may_pull(skb, RTL8_4_TAG_LEN))) - return NULL; - - tag = dsa_etype_header_pos_rx(skb); + memcpy(tag16, tag, RTL8_4_TAG_LEN); /* Parse Realtek EtherType */ - etype = ntohs(tag[0]); + etype = ntohs(tag16[0]); if (unlikely(etype != ETH_P_REALTEK)) { dev_warn_ratelimited(&dev->dev, "non-realtek ethertype 0x%04x\n", etype); - return NULL; + return -EPROTO; } /* Parse Protocol */ - proto = FIELD_GET(RTL8_4_PROTOCOL, ntohs(tag[1])); + proto = FIELD_GET(RTL8_4_PROTOCOL, ntohs(tag16[1])); if (unlikely(proto != RTL8_4_PROTOCOL_RTL8365MB)) { dev_warn_ratelimited(&dev->dev, "unknown realtek protocol 0x%02x\n", proto); - return NULL; + return -EPROTO; } /* Parse REASON */ - reason = FIELD_GET(RTL8_4_REASON, ntohs(tag[1])); + reason = FIELD_GET(RTL8_4_REASON, ntohs(tag16[1])); /* Parse TX (switch->CPU) */ - port = FIELD_GET(RTL8_4_TX, ntohs(tag[3])); + port = FIELD_GET(RTL8_4_TX, ntohs(tag16[3])); skb->dev = dsa_master_find_slave(dev, 0, port); if (!skb->dev) { dev_warn_ratelimited(&dev->dev, "could not find slave for port %d\n", port); - return NULL; + return -ENOENT; } + if (reason != RTL8_4_REASON_TRAP) + dsa_default_offload_fwd_mark(skb); + + return 0; +} + +static struct sk_buff *rtl8_4_tag_rcv(struct sk_buff *skb, + struct net_device *dev) +{ + if (unlikely(!pskb_may_pull(skb, RTL8_4_TAG_LEN))) + return NULL; + + if (unlikely(rtl8_4_read_tag(skb, dev, dsa_etype_header_pos_rx(skb)))) + return NULL; + /* Remove tag and recalculate checksum */ skb_pull_rcsum(skb, RTL8_4_TAG_LEN); dsa_strip_etype_header(skb, RTL8_4_TAG_LEN); - if (reason != RTL8_4_REASON_TRAP) - dsa_default_offload_fwd_mark(skb); + return skb; +} + +static struct sk_buff *rtl8_4t_tag_rcv(struct sk_buff *skb, + struct net_device *dev) +{ + if (skb_linearize(skb)) + return NULL; + + if (unlikely(rtl8_4_read_tag(skb, dev, skb_tail_pointer(skb) - RTL8_4_TAG_LEN))) + return NULL; + + if (pskb_trim_rcsum(skb, skb->len - RTL8_4_TAG_LEN)) + return NULL; return skb; } +/* Ethertype version */ static const struct dsa_device_ops rtl8_4_netdev_ops = { .name = "rtl8_4", .proto = DSA_TAG_PROTO_RTL8_4, @@ -172,7 +235,28 @@ static const struct dsa_device_ops rtl8_4_netdev_ops = { .rcv = rtl8_4_tag_rcv, .needed_headroom = RTL8_4_TAG_LEN, }; -module_dsa_tag_driver(rtl8_4_netdev_ops); -MODULE_LICENSE("GPL"); +DSA_TAG_DRIVER(rtl8_4_netdev_ops); + MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_RTL8_4); + +/* Tail version */ +static const struct dsa_device_ops rtl8_4t_netdev_ops = { + .name = "rtl8_4t", + .proto = DSA_TAG_PROTO_RTL8_4T, + .xmit = rtl8_4t_tag_xmit, + .rcv = rtl8_4t_tag_rcv, + .needed_tailroom = RTL8_4_TAG_LEN, +}; + +DSA_TAG_DRIVER(rtl8_4t_netdev_ops); + +MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_RTL8_4L); + +static struct dsa_tag_driver *dsa_tag_drivers[] = { + &DSA_TAG_DRIVER_NAME(rtl8_4_netdev_ops), + &DSA_TAG_DRIVER_NAME(rtl8_4t_netdev_ops), +}; +module_dsa_tag_drivers(dsa_tag_drivers); + +MODULE_LICENSE("GPL");