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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2015, The Linux Foundation. All rights reserved.
*/
#include <linux/etherdevice.h>
#include <linux/bitfield.h>
#include <net/dsa.h>
#include <linux/dsa/tag_qca.h>
#include "dsa_priv.h"
static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct dsa_port *dp = dsa_slave_to_port(dev);
__be16 *phdr;
u16 hdr;
skb_push(skb, QCA_HDR_LEN);
dsa_alloc_etype_header(skb, QCA_HDR_LEN);
phdr = dsa_etype_header_pos_tx(skb);
/* Set the version field, and set destination port information */
hdr = FIELD_PREP(QCA_HDR_XMIT_VERSION, QCA_HDR_VERSION);
hdr |= QCA_HDR_XMIT_FROM_CPU;
hdr |= FIELD_PREP(QCA_HDR_XMIT_DP_BIT, BIT(dp->index));
*phdr = htons(hdr);
return skb;
}
static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev)
{
struct qca_tagger_data *tagger_data;
struct dsa_port *dp = dev->dsa_ptr;
struct dsa_switch *ds = dp->ds;
u8 ver, pk_type;
__be16 *phdr;
int port;
u16 hdr;
BUILD_BUG_ON(sizeof(struct qca_mgmt_ethhdr) != QCA_HDR_MGMT_HEADER_LEN + QCA_HDR_LEN);
tagger_data = ds->tagger_data;
if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
return NULL;
phdr = dsa_etype_header_pos_rx(skb);
hdr = ntohs(*phdr);
/* Make sure the version is correct */
ver = FIELD_GET(QCA_HDR_RECV_VERSION, hdr);
if (unlikely(ver != QCA_HDR_VERSION))
return NULL;
/* Get pk type */
pk_type = FIELD_GET(QCA_HDR_RECV_TYPE, hdr);
/* Ethernet mgmt read/write packet */
if (pk_type == QCA_HDR_RECV_TYPE_RW_REG_ACK) {
if (likely(tagger_data->rw_reg_ack_handler))
tagger_data->rw_reg_ack_handler(ds, skb);
return NULL;
}
/* Ethernet MIB counter packet */
if (pk_type == QCA_HDR_RECV_TYPE_MIB) {
if (likely(tagger_data->mib_autocast_handler))
tagger_data->mib_autocast_handler(ds, skb);
return NULL;
}
/* Remove QCA tag and recalculate checksum */
skb_pull_rcsum(skb, QCA_HDR_LEN);
dsa_strip_etype_header(skb, QCA_HDR_LEN);
/* Get source port information */
port = FIELD_GET(QCA_HDR_RECV_SOURCE_PORT, hdr);
skb->dev = dsa_master_find_slave(dev, 0, port);
if (!skb->dev)
return NULL;
return skb;
}
static int qca_tag_connect(struct dsa_switch *ds)
{
struct qca_tagger_data *tagger_data;
tagger_data = kzalloc(sizeof(*tagger_data), GFP_KERNEL);
if (!tagger_data)
return -ENOMEM;
ds->tagger_data = tagger_data;
return 0;
}
static void qca_tag_disconnect(struct dsa_switch *ds)
{
kfree(ds->tagger_data);
ds->tagger_data = NULL;
}
static const struct dsa_device_ops qca_netdev_ops = {
.name = "qca",
.proto = DSA_TAG_PROTO_QCA,
.connect = qca_tag_connect,
.disconnect = qca_tag_disconnect,
.xmit = qca_tag_xmit,
.rcv = qca_tag_rcv,
.needed_headroom = QCA_HDR_LEN,
.promisc_on_master = true,
};
MODULE_LICENSE("GPL");
MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_QCA);
module_dsa_tag_driver(qca_netdev_ops);
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