+++ /dev/null
-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
projects / openwrt / openwrt.git / blobdiff