1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (c) 2015, The Linux Foundation. All rights reserved.
  4 */
  5
  6#include <linux/etherdevice.h>
  7#include <linux/bitfield.h>
  8#include <net/dsa.h>
  9#include <linux/dsa/tag_qca.h>
 10
 11#include "tag.h"
 12
 13#define QCA_NAME "qca"
 14
 15static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
 16{
 17	struct dsa_port *dp = dsa_slave_to_port(dev);
 18	__be16 *phdr;
 19	u16 hdr;
 20
 21	skb_push(skb, QCA_HDR_LEN);
 22
 23	dsa_alloc_etype_header(skb, QCA_HDR_LEN);
 24	phdr = dsa_etype_header_pos_tx(skb);
 25
 26	/* Set the version field, and set destination port information */
 27	hdr = FIELD_PREP(QCA_HDR_XMIT_VERSION, QCA_HDR_VERSION);
 28	hdr |= QCA_HDR_XMIT_FROM_CPU;
 29	hdr |= FIELD_PREP(QCA_HDR_XMIT_DP_BIT, BIT(dp->index));
 30
 31	*phdr = htons(hdr);
 32
 33	return skb;
 34}
 35
 36static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev)
 37{
 38	struct qca_tagger_data *tagger_data;
 39	struct dsa_port *dp = dev->dsa_ptr;
 40	struct dsa_switch *ds = dp->ds;
 41	u8 ver, pk_type;
 42	__be16 *phdr;
 43	int port;
 44	u16 hdr;
 45
 46	BUILD_BUG_ON(sizeof(struct qca_mgmt_ethhdr) != QCA_HDR_MGMT_HEADER_LEN + QCA_HDR_LEN);
 47
 48	tagger_data = ds->tagger_data;
 49
 50	if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
 51		return NULL;
 52
 53	phdr = dsa_etype_header_pos_rx(skb);
 54	hdr = ntohs(*phdr);
 55
 56	/* Make sure the version is correct */
 57	ver = FIELD_GET(QCA_HDR_RECV_VERSION, hdr);
 58	if (unlikely(ver != QCA_HDR_VERSION))
 59		return NULL;
 60
 61	/* Get pk type */
 62	pk_type = FIELD_GET(QCA_HDR_RECV_TYPE, hdr);
 63
 64	/* Ethernet mgmt read/write packet */
 65	if (pk_type == QCA_HDR_RECV_TYPE_RW_REG_ACK) {
 66		if (likely(tagger_data->rw_reg_ack_handler))
 67			tagger_data->rw_reg_ack_handler(ds, skb);
 68		return NULL;
 69	}
 70
 71	/* Ethernet MIB counter packet */
 72	if (pk_type == QCA_HDR_RECV_TYPE_MIB) {
 73		if (likely(tagger_data->mib_autocast_handler))
 74			tagger_data->mib_autocast_handler(ds, skb);
 75		return NULL;
 76	}
 77
 78	/* Remove QCA tag and recalculate checksum */
 79	skb_pull_rcsum(skb, QCA_HDR_LEN);
 80	dsa_strip_etype_header(skb, QCA_HDR_LEN);
 81
 82	/* Get source port information */
 83	port = FIELD_GET(QCA_HDR_RECV_SOURCE_PORT, hdr);
 84
 85	skb->dev = dsa_master_find_slave(dev, 0, port);
 86	if (!skb->dev)
 87		return NULL;
 88
 
 
 
 
 89	return skb;
 90}
 91
 92static int qca_tag_connect(struct dsa_switch *ds)
 93{
 94	struct qca_tagger_data *tagger_data;
 95
 96	tagger_data = kzalloc(sizeof(*tagger_data), GFP_KERNEL);
 97	if (!tagger_data)
 98		return -ENOMEM;
 99
100	ds->tagger_data = tagger_data;
101
102	return 0;
103}
104
105static void qca_tag_disconnect(struct dsa_switch *ds)
106{
107	kfree(ds->tagger_data);
108	ds->tagger_data = NULL;
109}
110
111static const struct dsa_device_ops qca_netdev_ops = {
112	.name	= QCA_NAME,
113	.proto	= DSA_TAG_PROTO_QCA,
114	.connect = qca_tag_connect,
115	.disconnect = qca_tag_disconnect,
116	.xmit	= qca_tag_xmit,
117	.rcv	= qca_tag_rcv,
118	.needed_headroom = QCA_HDR_LEN,
119	.promisc_on_master = true,
120};
121
 
122MODULE_LICENSE("GPL");
123MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_QCA, QCA_NAME);
124
125module_dsa_tag_driver(qca_netdev_ops);

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (c) 2015, The Linux Foundation. All rights reserved.
  4 */
  5
  6#include <linux/etherdevice.h>
  7#include <linux/bitfield.h>
  8#include <net/dsa.h>
  9#include <linux/dsa/tag_qca.h>
 10
 11#include "tag.h"
 12
 13#define QCA_NAME "qca"
 14
 15static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
 16{
 17	struct dsa_port *dp = dsa_user_to_port(dev);
 18	__be16 *phdr;
 19	u16 hdr;
 20
 21	skb_push(skb, QCA_HDR_LEN);
 22
 23	dsa_alloc_etype_header(skb, QCA_HDR_LEN);
 24	phdr = dsa_etype_header_pos_tx(skb);
 25
 26	/* Set the version field, and set destination port information */
 27	hdr = FIELD_PREP(QCA_HDR_XMIT_VERSION, QCA_HDR_VERSION);
 28	hdr |= QCA_HDR_XMIT_FROM_CPU;
 29	hdr |= FIELD_PREP(QCA_HDR_XMIT_DP_BIT, BIT(dp->index));
 30
 31	*phdr = htons(hdr);
 32
 33	return skb;
 34}
 35
 36static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev)
 37{
 38	struct qca_tagger_data *tagger_data;
 39	struct dsa_port *dp = dev->dsa_ptr;
 40	struct dsa_switch *ds = dp->ds;
 41	u8 ver, pk_type;
 42	__be16 *phdr;
 43	int port;
 44	u16 hdr;
 45
 46	BUILD_BUG_ON(sizeof(struct qca_mgmt_ethhdr) != QCA_HDR_MGMT_HEADER_LEN + QCA_HDR_LEN);
 47
 48	tagger_data = ds->tagger_data;
 49
 50	if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
 51		return NULL;
 52
 53	phdr = dsa_etype_header_pos_rx(skb);
 54	hdr = ntohs(*phdr);
 55
 56	/* Make sure the version is correct */
 57	ver = FIELD_GET(QCA_HDR_RECV_VERSION, hdr);
 58	if (unlikely(ver != QCA_HDR_VERSION))
 59		return NULL;
 60
 61	/* Get pk type */
 62	pk_type = FIELD_GET(QCA_HDR_RECV_TYPE, hdr);
 63
 64	/* Ethernet mgmt read/write packet */
 65	if (pk_type == QCA_HDR_RECV_TYPE_RW_REG_ACK) {
 66		if (likely(tagger_data->rw_reg_ack_handler))
 67			tagger_data->rw_reg_ack_handler(ds, skb);
 68		return NULL;
 69	}
 70
 71	/* Ethernet MIB counter packet */
 72	if (pk_type == QCA_HDR_RECV_TYPE_MIB) {
 73		if (likely(tagger_data->mib_autocast_handler))
 74			tagger_data->mib_autocast_handler(ds, skb);
 75		return NULL;
 76	}
 77
 
 
 
 
 78	/* Get source port information */
 79	port = FIELD_GET(QCA_HDR_RECV_SOURCE_PORT, hdr);
 80
 81	skb->dev = dsa_conduit_find_user(dev, 0, port);
 82	if (!skb->dev)
 83		return NULL;
 84
 85	/* Remove QCA tag and recalculate checksum */
 86	skb_pull_rcsum(skb, QCA_HDR_LEN);
 87	dsa_strip_etype_header(skb, QCA_HDR_LEN);
 88
 89	return skb;
 90}
 91
 92static int qca_tag_connect(struct dsa_switch *ds)
 93{
 94	struct qca_tagger_data *tagger_data;
 95
 96	tagger_data = kzalloc(sizeof(*tagger_data), GFP_KERNEL);
 97	if (!tagger_data)
 98		return -ENOMEM;
 99
100	ds->tagger_data = tagger_data;
101
102	return 0;
103}
104
105static void qca_tag_disconnect(struct dsa_switch *ds)
106{
107	kfree(ds->tagger_data);
108	ds->tagger_data = NULL;
109}
110
111static const struct dsa_device_ops qca_netdev_ops = {
112	.name	= QCA_NAME,
113	.proto	= DSA_TAG_PROTO_QCA,
114	.connect = qca_tag_connect,
115	.disconnect = qca_tag_disconnect,
116	.xmit	= qca_tag_xmit,
117	.rcv	= qca_tag_rcv,
118	.needed_headroom = QCA_HDR_LEN,
119	.promisc_on_conduit = true,
120};
121
122MODULE_DESCRIPTION("DSA tag driver for Qualcomm Atheros QCA8K switches");
123MODULE_LICENSE("GPL");
124MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_QCA, QCA_NAME);
125
126module_dsa_tag_driver(qca_netdev_ops);