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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2015, The Linux Foundation. All rights reserved.
*/
#include <linux/etherdevice.h>
#include "dsa_priv.h"
#define QCA_HDR_LEN 2
#define QCA_HDR_VERSION 0x2
#define QCA_HDR_RECV_VERSION_MASK GENMASK(15, 14)
#define QCA_HDR_RECV_VERSION_S 14
#define QCA_HDR_RECV_PRIORITY_MASK GENMASK(13, 11)
#define QCA_HDR_RECV_PRIORITY_S 11
#define QCA_HDR_RECV_TYPE_MASK GENMASK(10, 6)
#define QCA_HDR_RECV_TYPE_S 6
#define QCA_HDR_RECV_FRAME_IS_TAGGED BIT(3)
#define QCA_HDR_RECV_SOURCE_PORT_MASK GENMASK(2, 0)
#define QCA_HDR_XMIT_VERSION_MASK GENMASK(15, 14)
#define QCA_HDR_XMIT_VERSION_S 14
#define QCA_HDR_XMIT_PRIORITY_MASK GENMASK(13, 11)
#define QCA_HDR_XMIT_PRIORITY_S 11
#define QCA_HDR_XMIT_CONTROL_MASK GENMASK(10, 8)
#define QCA_HDR_XMIT_CONTROL_S 8
#define QCA_HDR_XMIT_FROM_CPU BIT(7)
#define QCA_HDR_XMIT_DP_BIT_MASK GENMASK(6, 0)
static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct dsa_port *dp = dsa_slave_to_port(dev);
u16 *phdr, hdr;
if (skb_cow_head(skb, QCA_HDR_LEN) < 0)
return NULL;
skb_push(skb, QCA_HDR_LEN);
memmove(skb->data, skb->data + QCA_HDR_LEN, 2 * ETH_ALEN);
phdr = (u16 *)(skb->data + 2 * ETH_ALEN);
/* Set the version field, and set destination port information */
hdr = QCA_HDR_VERSION << QCA_HDR_XMIT_VERSION_S |
QCA_HDR_XMIT_FROM_CPU | BIT(dp->index);
*phdr = htons(hdr);
return skb;
}
static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt)
{
u8 ver;
int port;
__be16 *phdr, hdr;
if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
return NULL;
/* The QCA header is added by the switch between src addr and Ethertype
* At this point, skb->data points to ethertype so header should be
* right before
*/
phdr = (__be16 *)(skb->data - 2);
hdr = ntohs(*phdr);
/* Make sure the version is correct */
ver = (hdr & QCA_HDR_RECV_VERSION_MASK) >> QCA_HDR_RECV_VERSION_S;
if (unlikely(ver != QCA_HDR_VERSION))
return NULL;
/* Remove QCA tag and recalculate checksum */
skb_pull_rcsum(skb, QCA_HDR_LEN);
memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - QCA_HDR_LEN,
ETH_HLEN - QCA_HDR_LEN);
/* Get source port information */
port = (hdr & QCA_HDR_RECV_SOURCE_PORT_MASK);
skb->dev = dsa_master_find_slave(dev, 0, port);
if (!skb->dev)
return NULL;
return skb;
}
static int qca_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
int *offset)
{
*offset = QCA_HDR_LEN;
*proto = ((__be16 *)skb->data)[0];
return 0;
}
static const struct dsa_device_ops qca_netdev_ops = {
.name = "qca",
.proto = DSA_TAG_PROTO_QCA,
.xmit = qca_tag_xmit,
.rcv = qca_tag_rcv,
.flow_dissect = qca_tag_flow_dissect,
.overhead = QCA_HDR_LEN,
};
MODULE_LICENSE("GPL");
MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_QCA);
module_dsa_tag_driver(qca_netdev_ops);
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