// 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);
|
__be16 *phdr;
|
u16 hdr;
|
|
skb_push(skb, QCA_HDR_LEN);
|
|
memmove(skb->data, skb->data + QCA_HDR_LEN, 2 * ETH_ALEN);
|
phdr = (__be16 *)(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;
|
u16 hdr;
|
int port;
|
__be16 *phdr;
|
|
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 const struct dsa_device_ops qca_netdev_ops = {
|
.name = "qca",
|
.proto = DSA_TAG_PROTO_QCA,
|
.xmit = qca_tag_xmit,
|
.rcv = qca_tag_rcv,
|
.overhead = QCA_HDR_LEN,
|
};
|
|
MODULE_LICENSE("GPL");
|
MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_QCA);
|
|
module_dsa_tag_driver(qca_netdev_ops);
|
