diff options
Diffstat (limited to 'target/linux/generic/backport-5.10/740-v5.13-0004-net-dsa-tag_brcm-add-support-for-legacy-tags.patch')
| -rw-r--r-- | target/linux/generic/backport-5.10/740-v5.13-0004-net-dsa-tag_brcm-add-support-for-legacy-tags.patch | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.10/740-v5.13-0004-net-dsa-tag_brcm-add-support-for-legacy-tags.patch b/target/linux/generic/backport-5.10/740-v5.13-0004-net-dsa-tag_brcm-add-support-for-legacy-tags.patch new file mode 100644 index 0000000000..3b7d8f37cd --- /dev/null +++ b/target/linux/generic/backport-5.10/740-v5.13-0004-net-dsa-tag_brcm-add-support-for-legacy-tags.patch @@ -0,0 +1,180 @@ +From 964dbf186eaa84d409c359ddf09c827a3fbe8228 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com> +Date: Wed, 17 Mar 2021 11:29:26 +0100 +Subject: [PATCH] net: dsa: tag_brcm: add support for legacy tags +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Add support for legacy Broadcom tags, which are similar to DSA_TAG_PROTO_BRCM. +These tags are used on BCM5325, BCM5365 and BCM63xx switches. + +Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +--- + include/net/dsa.h | 2 + + net/dsa/Kconfig | 7 +++ + net/dsa/tag_brcm.c | 107 +++++++++++++++++++++++++++++++++++++++++++-- + 3 files changed, 113 insertions(+), 3 deletions(-) + +--- a/include/net/dsa.h ++++ b/include/net/dsa.h +@@ -45,10 +45,12 @@ struct phylink_link_state; + #define DSA_TAG_PROTO_OCELOT_VALUE 15 + #define DSA_TAG_PROTO_AR9331_VALUE 16 + #define DSA_TAG_PROTO_RTL4_A_VALUE 17 ++#define DSA_TAG_PROTO_BRCM_LEGACY_VALUE 22 + + enum dsa_tag_protocol { + DSA_TAG_PROTO_NONE = DSA_TAG_PROTO_NONE_VALUE, + DSA_TAG_PROTO_BRCM = DSA_TAG_PROTO_BRCM_VALUE, ++ DSA_TAG_PROTO_BRCM_LEGACY = DSA_TAG_PROTO_BRCM_LEGACY_VALUE, + DSA_TAG_PROTO_BRCM_PREPEND = DSA_TAG_PROTO_BRCM_PREPEND_VALUE, + DSA_TAG_PROTO_DSA = DSA_TAG_PROTO_DSA_VALUE, + DSA_TAG_PROTO_EDSA = DSA_TAG_PROTO_EDSA_VALUE, +--- a/net/dsa/Kconfig ++++ b/net/dsa/Kconfig +@@ -47,6 +47,13 @@ config NET_DSA_TAG_BRCM + Say Y if you want to enable support for tagging frames for the + Broadcom switches which place the tag after the MAC source address. + ++config NET_DSA_TAG_BRCM_LEGACY ++ tristate "Tag driver for Broadcom legacy switches using in-frame headers" ++ select NET_DSA_TAG_BRCM_COMMON ++ help ++ Say Y if you want to enable support for tagging frames for the ++ Broadcom legacy switches which place the tag after the MAC source ++ address. + + config NET_DSA_TAG_BRCM_PREPEND + tristate "Tag driver for Broadcom switches using prepended headers" +--- a/net/dsa/tag_brcm.c ++++ b/net/dsa/tag_brcm.c +@@ -11,9 +11,26 @@ + + #include "dsa_priv.h" + +-/* This tag length is 4 bytes, older ones were 6 bytes, we do not +- * handle them +- */ ++/* Legacy Broadcom tag (6 bytes) */ ++#define BRCM_LEG_TAG_LEN 6 ++ ++/* Type fields */ ++/* 1st byte in the tag */ ++#define BRCM_LEG_TYPE_HI 0x88 ++/* 2nd byte in the tag */ ++#define BRCM_LEG_TYPE_LO 0x74 ++ ++/* Tag fields */ ++/* 3rd byte in the tag */ ++#define BRCM_LEG_UNICAST (0 << 5) ++#define BRCM_LEG_MULTICAST (1 << 5) ++#define BRCM_LEG_EGRESS (2 << 5) ++#define BRCM_LEG_INGRESS (3 << 5) ++ ++/* 6th byte in the tag */ ++#define BRCM_LEG_PORT_ID (0xf) ++ ++/* Newer Broadcom tag (4 bytes) */ + #define BRCM_TAG_LEN 4 + + /* Tag is constructed and desconstructed using byte by byte access +@@ -194,6 +211,87 @@ DSA_TAG_DRIVER(brcm_netdev_ops); + MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_BRCM); + #endif + ++#if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM_LEGACY) ++static struct sk_buff *brcm_leg_tag_xmit(struct sk_buff *skb, ++ struct net_device *dev) ++{ ++ struct dsa_port *dp = dsa_slave_to_port(dev); ++ u8 *brcm_tag; ++ ++ /* The Ethernet switch we are interfaced with needs packets to be at ++ * least 64 bytes (including FCS) otherwise they will be discarded when ++ * they enter the switch port logic. When Broadcom tags are enabled, we ++ * need to make sure that packets are at least 70 bytes ++ * (including FCS and tag) because the length verification is done after ++ * the Broadcom tag is stripped off the ingress packet. ++ * ++ * Let dsa_slave_xmit() free the SKB ++ */ ++ if (__skb_put_padto(skb, ETH_ZLEN + BRCM_LEG_TAG_LEN, false)) ++ return NULL; ++ ++ skb_push(skb, BRCM_LEG_TAG_LEN); ++ ++ memmove(skb->data, skb->data + BRCM_LEG_TAG_LEN, 2 * ETH_ALEN); ++ ++ brcm_tag = skb->data + 2 * ETH_ALEN; ++ ++ /* Broadcom tag type */ ++ brcm_tag[0] = BRCM_LEG_TYPE_HI; ++ brcm_tag[1] = BRCM_LEG_TYPE_LO; ++ ++ /* Broadcom tag value */ ++ brcm_tag[2] = BRCM_LEG_EGRESS; ++ brcm_tag[3] = 0; ++ brcm_tag[4] = 0; ++ brcm_tag[5] = dp->index & BRCM_LEG_PORT_ID; ++ ++ return skb; ++} ++ ++static struct sk_buff *brcm_leg_tag_rcv(struct sk_buff *skb, ++ struct net_device *dev, ++ struct packet_type *pt) ++{ ++ int source_port; ++ u8 *brcm_tag; ++ ++ if (unlikely(!pskb_may_pull(skb, BRCM_LEG_PORT_ID))) ++ return NULL; ++ ++ brcm_tag = skb->data - 2; ++ ++ source_port = brcm_tag[5] & BRCM_LEG_PORT_ID; ++ ++ skb->dev = dsa_master_find_slave(dev, 0, source_port); ++ if (!skb->dev) ++ return NULL; ++ ++ /* Remove Broadcom tag and update checksum */ ++ skb_pull_rcsum(skb, BRCM_LEG_TAG_LEN); ++ ++ skb->offload_fwd_mark = 1; ++ ++ /* Move the Ethernet DA and SA */ ++ memmove(skb->data - ETH_HLEN, ++ skb->data - ETH_HLEN - BRCM_LEG_TAG_LEN, ++ 2 * ETH_ALEN); ++ ++ return skb; ++} ++ ++static const struct dsa_device_ops brcm_legacy_netdev_ops = { ++ .name = "brcm-legacy", ++ .proto = DSA_TAG_PROTO_BRCM_LEGACY, ++ .xmit = brcm_leg_tag_xmit, ++ .rcv = brcm_leg_tag_rcv, ++ .overhead = BRCM_LEG_TAG_LEN, ++}; ++ ++DSA_TAG_DRIVER(brcm_legacy_netdev_ops); ++MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_BRCM_LEGACY); ++#endif /* CONFIG_NET_DSA_TAG_BRCM_LEGACY */ ++ + #if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM_PREPEND) + static struct sk_buff *brcm_tag_xmit_prepend(struct sk_buff *skb, + struct net_device *dev) +@@ -226,6 +324,9 @@ static struct dsa_tag_driver *dsa_tag_dr + #if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM) + &DSA_TAG_DRIVER_NAME(brcm_netdev_ops), + #endif ++#if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM_LEGACY) ++ &DSA_TAG_DRIVER_NAME(brcm_legacy_netdev_ops), ++#endif + #if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM_PREPEND) + &DSA_TAG_DRIVER_NAME(brcm_prepend_netdev_ops), + #endif |