Oleksij Rempel | 48fda74 | 2019-12-18 09:02:14 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Copyright (c) 2019 Pengutronix, Oleksij Rempel <kernel@pengutronix.de> |
| 4 | */ |
| 5 | |
| 6 | |
| 7 | #include <linux/bitfield.h> |
| 8 | #include <linux/etherdevice.h> |
| 9 | |
Vladimir Oltean | bd954b8 | 2022-11-21 15:55:47 +0200 | [diff] [blame] | 10 | #include "tag.h" |
Oleksij Rempel | 48fda74 | 2019-12-18 09:02:14 +0100 | [diff] [blame] | 11 | |
Vladimir Oltean | 94793a5 | 2022-11-15 03:18:44 +0200 | [diff] [blame] | 12 | #define AR9331_NAME "ar9331" |
| 13 | |
Oleksij Rempel | 48fda74 | 2019-12-18 09:02:14 +0100 | [diff] [blame] | 14 | #define AR9331_HDR_LEN 2 |
| 15 | #define AR9331_HDR_VERSION 1 |
| 16 | |
| 17 | #define AR9331_HDR_VERSION_MASK GENMASK(15, 14) |
| 18 | #define AR9331_HDR_PRIORITY_MASK GENMASK(13, 12) |
| 19 | #define AR9331_HDR_TYPE_MASK GENMASK(10, 8) |
| 20 | #define AR9331_HDR_BROADCAST BIT(7) |
| 21 | #define AR9331_HDR_FROM_CPU BIT(6) |
| 22 | /* AR9331_HDR_RESERVED - not used or may be version field. |
| 23 | * According to the AR8216 doc it should 0b10. On AR9331 it is 0b11 on RX path |
| 24 | * and should be set to 0b11 to make it work. |
| 25 | */ |
| 26 | #define AR9331_HDR_RESERVED_MASK GENMASK(5, 4) |
| 27 | #define AR9331_HDR_PORT_NUM_MASK GENMASK(3, 0) |
| 28 | |
| 29 | static struct sk_buff *ar9331_tag_xmit(struct sk_buff *skb, |
| 30 | struct net_device *dev) |
| 31 | { |
| 32 | struct dsa_port *dp = dsa_slave_to_port(dev); |
| 33 | __le16 *phdr; |
| 34 | u16 hdr; |
| 35 | |
Oleksij Rempel | 48fda74 | 2019-12-18 09:02:14 +0100 | [diff] [blame] | 36 | phdr = skb_push(skb, AR9331_HDR_LEN); |
| 37 | |
| 38 | hdr = FIELD_PREP(AR9331_HDR_VERSION_MASK, AR9331_HDR_VERSION); |
| 39 | hdr |= AR9331_HDR_FROM_CPU | dp->index; |
| 40 | /* 0b10 for AR8216 and 0b11 for AR9331 */ |
| 41 | hdr |= AR9331_HDR_RESERVED_MASK; |
| 42 | |
| 43 | phdr[0] = cpu_to_le16(hdr); |
| 44 | |
| 45 | return skb; |
| 46 | } |
| 47 | |
| 48 | static struct sk_buff *ar9331_tag_rcv(struct sk_buff *skb, |
Vladimir Oltean | 29a097b | 2021-07-31 17:14:32 +0300 | [diff] [blame] | 49 | struct net_device *ndev) |
Oleksij Rempel | 48fda74 | 2019-12-18 09:02:14 +0100 | [diff] [blame] | 50 | { |
| 51 | u8 ver, port; |
| 52 | u16 hdr; |
| 53 | |
| 54 | if (unlikely(!pskb_may_pull(skb, AR9331_HDR_LEN))) |
| 55 | return NULL; |
| 56 | |
| 57 | hdr = le16_to_cpu(*(__le16 *)skb_mac_header(skb)); |
| 58 | |
| 59 | ver = FIELD_GET(AR9331_HDR_VERSION_MASK, hdr); |
| 60 | if (unlikely(ver != AR9331_HDR_VERSION)) { |
| 61 | netdev_warn_once(ndev, "%s:%i wrong header version 0x%2x\n", |
| 62 | __func__, __LINE__, hdr); |
| 63 | return NULL; |
| 64 | } |
| 65 | |
| 66 | if (unlikely(hdr & AR9331_HDR_FROM_CPU)) { |
| 67 | netdev_warn_once(ndev, "%s:%i packet should not be from cpu 0x%2x\n", |
| 68 | __func__, __LINE__, hdr); |
| 69 | return NULL; |
| 70 | } |
| 71 | |
| 72 | skb_pull_rcsum(skb, AR9331_HDR_LEN); |
| 73 | |
| 74 | /* Get source port information */ |
| 75 | port = FIELD_GET(AR9331_HDR_PORT_NUM_MASK, hdr); |
| 76 | |
| 77 | skb->dev = dsa_master_find_slave(ndev, 0, port); |
| 78 | if (!skb->dev) |
| 79 | return NULL; |
| 80 | |
| 81 | return skb; |
| 82 | } |
| 83 | |
| 84 | static const struct dsa_device_ops ar9331_netdev_ops = { |
Vladimir Oltean | 94793a5 | 2022-11-15 03:18:44 +0200 | [diff] [blame] | 85 | .name = AR9331_NAME, |
Oleksij Rempel | 48fda74 | 2019-12-18 09:02:14 +0100 | [diff] [blame] | 86 | .proto = DSA_TAG_PROTO_AR9331, |
| 87 | .xmit = ar9331_tag_xmit, |
| 88 | .rcv = ar9331_tag_rcv, |
Vladimir Oltean | 4e50025 | 2021-06-11 22:01:24 +0300 | [diff] [blame] | 89 | .needed_headroom = AR9331_HDR_LEN, |
Oleksij Rempel | 48fda74 | 2019-12-18 09:02:14 +0100 | [diff] [blame] | 90 | }; |
| 91 | |
| 92 | MODULE_LICENSE("GPL v2"); |
Vladimir Oltean | 94793a5 | 2022-11-15 03:18:44 +0200 | [diff] [blame] | 93 | MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_AR9331, AR9331_NAME); |
Oleksij Rempel | 48fda74 | 2019-12-18 09:02:14 +0100 | [diff] [blame] | 94 | module_dsa_tag_driver(ar9331_netdev_ops); |