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net: dsa: vsc73xx: introduce tag 8021q for vsc73xx

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This commit introduces a new tagger based on 802.1q tagging.
It's designed for the vsc73xx driver. The VSC73xx family doesn't have
any tag support for the RGMII port, but it could be based on VLANs.

Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patch.msgid.link/20240713211620.1125910-8-paweldembicki@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Pawel Dembicki 2024-07-13 23:16:13 +02:00 committed by Jakub Kicinski
parent d124cf54df
commit 6c87e1a479
4 changed files with 77 additions and 0 deletions
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2
include/net/dsa.h
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@ -53,6 +53,7 @@ struct tc_action;
#define DSA_TAG_PROTO_RTL8_4T_VALUE 25
#define DSA_TAG_PROTO_RZN1_A5PSW_VALUE 26
#define DSA_TAG_PROTO_LAN937X_VALUE 27
#define DSA_TAG_PROTO_VSC73XX_8021Q_VALUE 28
enum dsa_tag_protocol {
DSA_TAG_PROTO_NONE = DSA_TAG_PROTO_NONE_VALUE,
@ -83,6 +84,7 @@ enum dsa_tag_protocol {
DSA_TAG_PROTO_RTL8_4T = DSA_TAG_PROTO_RTL8_4T_VALUE,
DSA_TAG_PROTO_RZN1_A5PSW = DSA_TAG_PROTO_RZN1_A5PSW_VALUE,
DSA_TAG_PROTO_LAN937X = DSA_TAG_PROTO_LAN937X_VALUE,
DSA_TAG_PROTO_VSC73XX_8021Q = DSA_TAG_PROTO_VSC73XX_8021Q_VALUE,
};
struct dsa_switch;

6
net/dsa/Kconfig
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@ -166,6 +166,12 @@ config NET_DSA_TAG_TRAILER
Say Y or M if you want to enable support for tagging frames at
with a trailed. e.g. Marvell 88E6060.
config NET_DSA_TAG_VSC73XX_8021Q
tristate "Tag driver for Microchip/Vitesse VSC73xx family of switches, using VLAN"
help
Say Y or M if you want to enable support for tagging frames with a
custom VLAN-based header.
config NET_DSA_TAG_XRS700X
tristate "Tag driver for XRS700x switches"
help

1
net/dsa/Makefile
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@ -37,6 +37,7 @@ obj-$(CONFIG_NET_DSA_TAG_RTL8_4) += tag_rtl8_4.o
obj-$(CONFIG_NET_DSA_TAG_RZN1_A5PSW) += tag_rzn1_a5psw.o
obj-$(CONFIG_NET_DSA_TAG_SJA1105) += tag_sja1105.o
obj-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o
obj-$(CONFIG_NET_DSA_TAG_VSC73XX_8021Q) += tag_vsc73xx_8021q.o
obj-$(CONFIG_NET_DSA_TAG_XRS700X) += tag_xrs700x.o
# for tracing framework to find trace.h

68
net/dsa/tag_vsc73xx_8021q.c Normal file
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@ -0,0 +1,68 @@
// SPDX-License-Identifier: GPL-2.0 OR MIT
/* Copyright (C) 2024 Pawel Dembicki <paweldembicki@gmail.com>
*/
#include <linux/dsa/8021q.h>
#include "tag.h"
#include "tag_8021q.h"
#define VSC73XX_8021Q_NAME "vsc73xx-8021q"
static struct sk_buff *
vsc73xx_xmit(struct sk_buff *skb, struct net_device *netdev)
{
struct dsa_port *dp = dsa_user_to_port(netdev);
u16 queue_mapping = skb_get_queue_mapping(skb);
u16 tx_vid = dsa_tag_8021q_standalone_vid(dp);
u8 pcp;
if (skb->offload_fwd_mark) {
unsigned int bridge_num = dsa_port_bridge_num_get(dp);
struct net_device *br = dsa_port_bridge_dev_get(dp);
if (br_vlan_enabled(br))
return skb;
tx_vid = dsa_tag_8021q_bridge_vid(bridge_num);
}
pcp = netdev_txq_to_tc(netdev, queue_mapping);
return dsa_8021q_xmit(skb, netdev, ETH_P_8021Q,
((pcp << VLAN_PRIO_SHIFT) | tx_vid));
}
static struct sk_buff *
vsc73xx_rcv(struct sk_buff *skb, struct net_device *netdev)
{
int src_port = -1, switch_id = -1, vbid = -1, vid = -1;
dsa_8021q_rcv(skb, &src_port, &switch_id, &vbid, &vid);
skb->dev = dsa_tag_8021q_find_user(netdev, src_port, switch_id,
vid, vbid);
if (!skb->dev) {
dev_warn_ratelimited(&netdev->dev,
"Couldn't decode source port\n");
return NULL;
}
dsa_default_offload_fwd_mark(skb);
return skb;
}
static const struct dsa_device_ops vsc73xx_8021q_netdev_ops = {
.name = VSC73XX_8021Q_NAME,
.proto = DSA_TAG_PROTO_VSC73XX_8021Q,
.xmit = vsc73xx_xmit,
.rcv = vsc73xx_rcv,
.needed_headroom = VLAN_HLEN,
.promisc_on_conduit = true,
};
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("DSA tag driver for VSC73XX family of switches, using VLAN");
MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_VSC73XX_8021Q, VSC73XX_8021Q_NAME);
module_dsa_tag_driver(vsc73xx_8021q_netdev_ops);