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net: dsa: add support for Atheros AR9331 TAG format
Add support for tag format used in Atheros AR9331 built-in switch. Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
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// SPDX-License-Identifier: GPL-2.0 | ||
/* | ||
* Copyright (c) 2019 Pengutronix, Oleksij Rempel <kernel@pengutronix.de> | ||
*/ | ||
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#include <linux/bitfield.h> | ||
#include <linux/etherdevice.h> | ||
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#include "dsa_priv.h" | ||
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#define AR9331_HDR_LEN 2 | ||
#define AR9331_HDR_VERSION 1 | ||
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#define AR9331_HDR_VERSION_MASK GENMASK(15, 14) | ||
#define AR9331_HDR_PRIORITY_MASK GENMASK(13, 12) | ||
#define AR9331_HDR_TYPE_MASK GENMASK(10, 8) | ||
#define AR9331_HDR_BROADCAST BIT(7) | ||
#define AR9331_HDR_FROM_CPU BIT(6) | ||
/* AR9331_HDR_RESERVED - not used or may be version field. | ||
* According to the AR8216 doc it should 0b10. On AR9331 it is 0b11 on RX path | ||
* and should be set to 0b11 to make it work. | ||
*/ | ||
#define AR9331_HDR_RESERVED_MASK GENMASK(5, 4) | ||
#define AR9331_HDR_PORT_NUM_MASK GENMASK(3, 0) | ||
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static struct sk_buff *ar9331_tag_xmit(struct sk_buff *skb, | ||
struct net_device *dev) | ||
{ | ||
struct dsa_port *dp = dsa_slave_to_port(dev); | ||
__le16 *phdr; | ||
u16 hdr; | ||
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if (skb_cow_head(skb, 0) < 0) | ||
return NULL; | ||
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phdr = skb_push(skb, AR9331_HDR_LEN); | ||
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hdr = FIELD_PREP(AR9331_HDR_VERSION_MASK, AR9331_HDR_VERSION); | ||
hdr |= AR9331_HDR_FROM_CPU | dp->index; | ||
/* 0b10 for AR8216 and 0b11 for AR9331 */ | ||
hdr |= AR9331_HDR_RESERVED_MASK; | ||
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phdr[0] = cpu_to_le16(hdr); | ||
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return skb; | ||
} | ||
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static struct sk_buff *ar9331_tag_rcv(struct sk_buff *skb, | ||
struct net_device *ndev, | ||
struct packet_type *pt) | ||
{ | ||
u8 ver, port; | ||
u16 hdr; | ||
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if (unlikely(!pskb_may_pull(skb, AR9331_HDR_LEN))) | ||
return NULL; | ||
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hdr = le16_to_cpu(*(__le16 *)skb_mac_header(skb)); | ||
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ver = FIELD_GET(AR9331_HDR_VERSION_MASK, hdr); | ||
if (unlikely(ver != AR9331_HDR_VERSION)) { | ||
netdev_warn_once(ndev, "%s:%i wrong header version 0x%2x\n", | ||
__func__, __LINE__, hdr); | ||
return NULL; | ||
} | ||
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if (unlikely(hdr & AR9331_HDR_FROM_CPU)) { | ||
netdev_warn_once(ndev, "%s:%i packet should not be from cpu 0x%2x\n", | ||
__func__, __LINE__, hdr); | ||
return NULL; | ||
} | ||
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skb_pull_rcsum(skb, AR9331_HDR_LEN); | ||
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/* Get source port information */ | ||
port = FIELD_GET(AR9331_HDR_PORT_NUM_MASK, hdr); | ||
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skb->dev = dsa_master_find_slave(ndev, 0, port); | ||
if (!skb->dev) | ||
return NULL; | ||
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return skb; | ||
} | ||
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static const struct dsa_device_ops ar9331_netdev_ops = { | ||
.name = "ar9331", | ||
.proto = DSA_TAG_PROTO_AR9331, | ||
.xmit = ar9331_tag_xmit, | ||
.rcv = ar9331_tag_rcv, | ||
.overhead = AR9331_HDR_LEN, | ||
}; | ||
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MODULE_LICENSE("GPL v2"); | ||
MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_AR9331); | ||
module_dsa_tag_driver(ar9331_netdev_ops); |