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|---|---|---|
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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 | ||
| 10 | #include "dsa_priv.h" | |
| 11 | ||
| 12 | #define AR9331_HDR_LEN 2 | |
| 13 | #define AR9331_HDR_VERSION 1 | |
| 14 | ||
| 15 | #define AR9331_HDR_VERSION_MASK GENMASK(15, 14) | |
| 16 | #define AR9331_HDR_PRIORITY_MASK GENMASK(13, 12) | |
| 17 | #define AR9331_HDR_TYPE_MASK GENMASK(10, 8) | |
| 18 | #define AR9331_HDR_BROADCAST BIT(7) | |
| 19 | #define AR9331_HDR_FROM_CPU BIT(6) | |
| 20 | /* AR9331_HDR_RESERVED - not used or may be version field. | |
| 21 | * According to the AR8216 doc it should 0b10. On AR9331 it is 0b11 on RX path | |
| 22 | * and should be set to 0b11 to make it work. | |
| 23 | */ | |
| 24 | #define AR9331_HDR_RESERVED_MASK GENMASK(5, 4) | |
| 25 | #define AR9331_HDR_PORT_NUM_MASK GENMASK(3, 0) | |
| 26 | ||
| 27 | static struct sk_buff *ar9331_tag_xmit(struct sk_buff *skb, | |
| 28 | struct net_device *dev) | |
| 29 | { | |
| 30 | struct dsa_port *dp = dsa_slave_to_port(dev); | |
| 31 | __le16 *phdr; | |
| 32 | u16 hdr; | |
| 33 | ||
| 48fda74f OR |
34 | phdr = skb_push(skb, AR9331_HDR_LEN); |
| 35 | ||
| 36 | hdr = FIELD_PREP(AR9331_HDR_VERSION_MASK, AR9331_HDR_VERSION); | |
| 37 | hdr |= AR9331_HDR_FROM_CPU | dp->index; | |
| 38 | /* 0b10 for AR8216 and 0b11 for AR9331 */ | |
| 39 | hdr |= AR9331_HDR_RESERVED_MASK; | |
| 40 | ||
| 41 | phdr[0] = cpu_to_le16(hdr); | |
| 42 | ||
| 43 | return skb; | |
| 44 | } | |
| 45 | ||
| 46 | static struct sk_buff *ar9331_tag_rcv(struct sk_buff *skb, | |
| 29a097b7 | 47 | struct net_device *ndev) |
| 48fda74f OR |
48 | { |
| 49 | u8 ver, port; | |
| 50 | u16 hdr; | |
| 51 | ||
| 52 | if (unlikely(!pskb_may_pull(skb, AR9331_HDR_LEN))) | |
| 53 | return NULL; | |
| 54 | ||
| 55 | hdr = le16_to_cpu(*(__le16 *)skb_mac_header(skb)); | |
| 56 | ||
| 57 | ver = FIELD_GET(AR9331_HDR_VERSION_MASK, hdr); | |
| 58 | if (unlikely(ver != AR9331_HDR_VERSION)) { | |
| 59 | netdev_warn_once(ndev, "%s:%i wrong header version 0x%2x\n", | |
| 60 | __func__, __LINE__, hdr); | |
| 61 | return NULL; | |
| 62 | } | |
| 63 | ||
| 64 | if (unlikely(hdr & AR9331_HDR_FROM_CPU)) { | |
| 65 | netdev_warn_once(ndev, "%s:%i packet should not be from cpu 0x%2x\n", | |
| 66 | __func__, __LINE__, hdr); | |
| 67 | return NULL; | |
| 68 | } | |
| 69 | ||
| 70 | skb_pull_rcsum(skb, AR9331_HDR_LEN); | |
| 71 | ||
| 72 | /* Get source port information */ | |
| 73 | port = FIELD_GET(AR9331_HDR_PORT_NUM_MASK, hdr); | |
| 74 | ||
| 75 | skb->dev = dsa_master_find_slave(ndev, 0, port); | |
| 76 | if (!skb->dev) | |
| 77 | return NULL; | |
| 78 | ||
| 79 | return skb; | |
| 80 | } | |
| 81 | ||
| 82 | static const struct dsa_device_ops ar9331_netdev_ops = { | |
| 83 | .name = "ar9331", | |
| 84 | .proto = DSA_TAG_PROTO_AR9331, | |
| 85 | .xmit = ar9331_tag_xmit, | |
| 86 | .rcv = ar9331_tag_rcv, | |
| 4e500251 | 87 | .needed_headroom = AR9331_HDR_LEN, |
| 48fda74f OR |
88 | }; |
| 89 | ||
| 90 | MODULE_LICENSE("GPL v2"); | |
| 91 | MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_AR9331); | |
| 92 | module_dsa_tag_driver(ar9331_netdev_ops); |