diff options
Diffstat (limited to 'target/linux/generic/backport-5.4/757-v5.8-net-dsa-tag_rtl4_a-Implement-Realtek-4-byte-A-tag.patch')
| -rw-r--r-- | target/linux/generic/backport-5.4/757-v5.8-net-dsa-tag_rtl4_a-Implement-Realtek-4-byte-A-tag.patch | 232 |
1 files changed, 0 insertions, 232 deletions
diff --git a/target/linux/generic/backport-5.4/757-v5.8-net-dsa-tag_rtl4_a-Implement-Realtek-4-byte-A-tag.patch b/target/linux/generic/backport-5.4/757-v5.8-net-dsa-tag_rtl4_a-Implement-Realtek-4-byte-A-tag.patch deleted file mode 100644 index 70d7000ba1..0000000000 --- a/target/linux/generic/backport-5.4/757-v5.8-net-dsa-tag_rtl4_a-Implement-Realtek-4-byte-A-tag.patch +++ /dev/null @@ -1,232 +0,0 @@ -From 078ced30af696b52a450a016a16eb47499d68117 Mon Sep 17 00:00:00 2001 -From: Linus Walleij <linus.walleij@linaro.org> -Date: Wed, 8 Jul 2020 14:25:36 +0200 -Subject: [PATCH 2/5] net: dsa: tag_rtl4_a: Implement Realtek 4 byte A tag - -This implements the known parts of the Realtek 4 byte -tag protocol version 0xA, as found in the RTL8366RB -DSA switch. - -It is designated as protocol version 0xA as a -different Realtek 4 byte tag format with protocol -version 0x9 is known to exist in the Realtek RTL8306 -chips. - -The tag and switch chip lacks public documentation, so -the tag format has been reverse-engineered from -packet dumps. As only ingress traffic has been available -for analysis an egress tag has not been possible to -develop (even using educated guesses about bit fields) -so this is as far as it gets. It is not known if the -switch even supports egress tagging. - -Excessive attempts to figure out the egress tag format -was made. When nothing else worked, I just tried all bit -combinations with 0xannp where a is protocol and p is -port. I looped through all values several times trying -to get a response from ping, without any positive -result. - -Using just these ingress tags however, the switch -functionality is vastly improved and the packets find -their way into the destination port without any -tricky VLAN configuration. On the D-Link DIR-685 the -LAN ports now come up and respond to ping without -any command line configuration so this is a real -improvement for users. - -Egress packets need to be restricted to the proper -target ports using VLAN, which the RTL8366RB DSA -switch driver already sets up. - -Cc: DENG Qingfang <dqfext@gmail.com> -Cc: Mauri Sandberg <sandberg@mailfence.com> -Reviewed-by: Andrew Lunn <andrew@lunn.ch> -Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> -Signed-off-by: Linus Walleij <linus.walleij@linaro.org> -Signed-off-by: David S. Miller <davem@davemloft.net> ---- - include/net/dsa.h | 2 + - net/dsa/Kconfig | 7 +++ - net/dsa/Makefile | 1 + - net/dsa/tag_rtl4_a.c | 130 +++++++++++++++++++++++++++++++++++++++++++ - 4 files changed, 140 insertions(+) - create mode 100644 net/dsa/tag_rtl4_a.c - ---- a/include/net/dsa.h -+++ b/include/net/dsa.h -@@ -42,6 +42,7 @@ struct phylink_link_state; - #define DSA_TAG_PROTO_8021Q_VALUE 12 - #define DSA_TAG_PROTO_SJA1105_VALUE 13 - #define DSA_TAG_PROTO_KSZ8795_VALUE 14 -+#define DSA_TAG_PROTO_RTL4_A_VALUE 17 - - enum dsa_tag_protocol { - DSA_TAG_PROTO_NONE = DSA_TAG_PROTO_NONE_VALUE, -@@ -59,6 +60,7 @@ enum dsa_tag_protocol { - DSA_TAG_PROTO_8021Q = DSA_TAG_PROTO_8021Q_VALUE, - DSA_TAG_PROTO_SJA1105 = DSA_TAG_PROTO_SJA1105_VALUE, - DSA_TAG_PROTO_KSZ8795 = DSA_TAG_PROTO_KSZ8795_VALUE, -+ DSA_TAG_PROTO_RTL4_A = DSA_TAG_PROTO_RTL4_A_VALUE, - }; - - struct packet_type; ---- a/net/dsa/Kconfig -+++ b/net/dsa/Kconfig -@@ -80,6 +80,13 @@ config NET_DSA_TAG_KSZ - Say Y if you want to enable support for tagging frames for the - Microchip 8795/9477/9893 families of switches. - -+config NET_DSA_TAG_RTL4_A -+ tristate "Tag driver for Realtek 4 byte protocol A tags" -+ help -+ Say Y or M if you want to enable support for tagging frames for the -+ Realtek switches with 4 byte protocol A tags, sich as found in -+ the Realtek RTL8366RB. -+ - config NET_DSA_TAG_QCA - tristate "Tag driver for Qualcomm Atheros QCA8K switches" - help ---- a/net/dsa/Makefile -+++ b/net/dsa/Makefile -@@ -10,6 +10,7 @@ obj-$(CONFIG_NET_DSA_TAG_DSA) += tag_dsa - obj-$(CONFIG_NET_DSA_TAG_EDSA) += tag_edsa.o - obj-$(CONFIG_NET_DSA_TAG_GSWIP) += tag_gswip.o - obj-$(CONFIG_NET_DSA_TAG_KSZ) += tag_ksz.o -+obj-$(CONFIG_NET_DSA_TAG_RTL4_A) += tag_rtl4_a.o - obj-$(CONFIG_NET_DSA_TAG_LAN9303) += tag_lan9303.o - obj-$(CONFIG_NET_DSA_TAG_MTK) += tag_mtk.o - obj-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o ---- /dev/null -+++ b/net/dsa/tag_rtl4_a.c -@@ -0,0 +1,130 @@ -+// SPDX-License-Identifier: GPL-2.0 -+/* -+ * Handler for Realtek 4 byte DSA switch tags -+ * Currently only supports protocol "A" found in RTL8366RB -+ * Copyright (c) 2020 Linus Walleij <linus.walleij@linaro.org> -+ * -+ * This "proprietary tag" header looks like so: -+ * -+ * ------------------------------------------------- -+ * | MAC DA | MAC SA | 0x8899 | 2 bytes tag | Type | -+ * ------------------------------------------------- -+ * -+ * The 2 bytes tag form a 16 bit big endian word. The exact -+ * meaning has been guessed from packet dumps from ingress -+ * frames, as no working egress traffic has been available -+ * we do not know the format of the egress tags or if they -+ * are even supported. -+ */ -+ -+#include <linux/etherdevice.h> -+#include <linux/bits.h> -+ -+#include "dsa_priv.h" -+ -+#define RTL4_A_HDR_LEN 4 -+#define RTL4_A_ETHERTYPE 0x8899 -+#define RTL4_A_PROTOCOL_SHIFT 12 -+/* -+ * 0x1 = Realtek Remote Control protocol (RRCP) -+ * 0x2/0x3 seems to be used for loopback testing -+ * 0x9 = RTL8306 DSA protocol -+ * 0xa = RTL8366RB DSA protocol -+ */ -+#define RTL4_A_PROTOCOL_RTL8366RB 0xa -+ -+static struct sk_buff *rtl4a_tag_xmit(struct sk_buff *skb, -+ struct net_device *dev) -+{ -+ /* -+ * Just let it pass thru, we don't know if it is possible -+ * to tag a frame with the 0x8899 ethertype and direct it -+ * to a specific port, all attempts at reverse-engineering have -+ * ended up with the frames getting dropped. -+ * -+ * The VLAN set-up needs to restrict the frames to the right port. -+ * -+ * If you have documentation on the tagging format for RTL8366RB -+ * (tag type A) then please contribute. -+ */ -+ return skb; -+} -+ -+static struct sk_buff *rtl4a_tag_rcv(struct sk_buff *skb, -+ struct net_device *dev, -+ struct packet_type *pt) -+{ -+ u16 protport; -+ __be16 *p; -+ u16 etype; -+ u8 *tag; -+ u8 prot; -+ u8 port; -+ -+ if (unlikely(!pskb_may_pull(skb, RTL4_A_HDR_LEN))) -+ return NULL; -+ -+ /* The RTL4 header has its own custom Ethertype 0x8899 and that -+ * starts right at the beginning of the packet, after the src -+ * ethernet addr. Apparantly skb->data always points 2 bytes in, -+ * behind the Ethertype. -+ */ -+ tag = skb->data - 2; -+ p = (__be16 *)tag; -+ etype = ntohs(*p); -+ if (etype != RTL4_A_ETHERTYPE) { -+ /* Not custom, just pass through */ -+ netdev_dbg(dev, "non-realtek ethertype 0x%04x\n", etype); -+ return skb; -+ } -+ p = (__be16 *)(tag + 2); -+ protport = ntohs(*p); -+ /* The 4 upper bits are the protocol */ -+ prot = (protport >> RTL4_A_PROTOCOL_SHIFT) & 0x0f; -+ if (prot != RTL4_A_PROTOCOL_RTL8366RB) { -+ netdev_err(dev, "unknown realtek protocol 0x%01x\n", prot); -+ return NULL; -+ } -+ port = protport & 0xff; -+ -+ skb->dev = dsa_master_find_slave(dev, 0, port); -+ if (!skb->dev) { -+ netdev_dbg(dev, "could not find slave for port %d\n", port); -+ return NULL; -+ } -+ -+ /* Remove RTL4 tag and recalculate checksum */ -+ skb_pull_rcsum(skb, RTL4_A_HDR_LEN); -+ -+ /* Move ethernet DA and SA in front of the data */ -+ memmove(skb->data - ETH_HLEN, -+ skb->data - ETH_HLEN - RTL4_A_HDR_LEN, -+ 2 * ETH_ALEN); -+ -+ skb->offload_fwd_mark = 1; -+ -+ return skb; -+} -+ -+static int rtl4a_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto, -+ int *offset) -+{ -+ *offset = RTL4_A_HDR_LEN; -+ /* Skip past the tag and fetch the encapsulated Ethertype */ -+ *proto = ((__be16 *)skb->data)[1]; -+ -+ return 0; -+} -+ -+static const struct dsa_device_ops rtl4a_netdev_ops = { -+ .name = "rtl4a", -+ .proto = DSA_TAG_PROTO_RTL4_A, -+ .xmit = rtl4a_tag_xmit, -+ .rcv = rtl4a_tag_rcv, -+ .flow_dissect = rtl4a_tag_flow_dissect, -+ .overhead = RTL4_A_HDR_LEN, -+}; -+module_dsa_tag_driver(rtl4a_netdev_ops); -+ -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_RTL4_A); |