John Crispin | cafdc45 | 2016-09-15 16:26:40 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2015, The Linux Foundation. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 and |
| 6 | * only version 2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/etherdevice.h> |
Vivien Didelot | ea5dd34 | 2017-05-17 15:46:03 -0400 | [diff] [blame] | 15 | |
John Crispin | cafdc45 | 2016-09-15 16:26:40 +0200 | [diff] [blame] | 16 | #include "dsa_priv.h" |
| 17 | |
| 18 | #define QCA_HDR_LEN 2 |
| 19 | #define QCA_HDR_VERSION 0x2 |
| 20 | |
| 21 | #define QCA_HDR_RECV_VERSION_MASK GENMASK(15, 14) |
| 22 | #define QCA_HDR_RECV_VERSION_S 14 |
| 23 | #define QCA_HDR_RECV_PRIORITY_MASK GENMASK(13, 11) |
| 24 | #define QCA_HDR_RECV_PRIORITY_S 11 |
| 25 | #define QCA_HDR_RECV_TYPE_MASK GENMASK(10, 6) |
| 26 | #define QCA_HDR_RECV_TYPE_S 6 |
| 27 | #define QCA_HDR_RECV_FRAME_IS_TAGGED BIT(3) |
| 28 | #define QCA_HDR_RECV_SOURCE_PORT_MASK GENMASK(2, 0) |
| 29 | |
| 30 | #define QCA_HDR_XMIT_VERSION_MASK GENMASK(15, 14) |
| 31 | #define QCA_HDR_XMIT_VERSION_S 14 |
| 32 | #define QCA_HDR_XMIT_PRIORITY_MASK GENMASK(13, 11) |
| 33 | #define QCA_HDR_XMIT_PRIORITY_S 11 |
| 34 | #define QCA_HDR_XMIT_CONTROL_MASK GENMASK(10, 8) |
| 35 | #define QCA_HDR_XMIT_CONTROL_S 8 |
| 36 | #define QCA_HDR_XMIT_FROM_CPU BIT(7) |
| 37 | #define QCA_HDR_XMIT_DP_BIT_MASK GENMASK(6, 0) |
| 38 | |
| 39 | static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev) |
| 40 | { |
Vivien Didelot | d945097 | 2017-10-16 11:12:15 -0400 | [diff] [blame] | 41 | struct dsa_port *dp = dsa_slave_to_port(dev); |
John Crispin | cafdc45 | 2016-09-15 16:26:40 +0200 | [diff] [blame] | 42 | u16 *phdr, hdr; |
| 43 | |
| 44 | dev->stats.tx_packets++; |
| 45 | dev->stats.tx_bytes += skb->len; |
| 46 | |
| 47 | if (skb_cow_head(skb, 0) < 0) |
Vivien Didelot | fe47d56 | 2017-06-01 16:07:15 -0400 | [diff] [blame] | 48 | return NULL; |
John Crispin | cafdc45 | 2016-09-15 16:26:40 +0200 | [diff] [blame] | 49 | |
| 50 | skb_push(skb, QCA_HDR_LEN); |
| 51 | |
| 52 | memmove(skb->data, skb->data + QCA_HDR_LEN, 2 * ETH_ALEN); |
| 53 | phdr = (u16 *)(skb->data + 2 * ETH_ALEN); |
| 54 | |
| 55 | /* Set the version field, and set destination port information */ |
| 56 | hdr = QCA_HDR_VERSION << QCA_HDR_XMIT_VERSION_S | |
Vivien Didelot | d945097 | 2017-10-16 11:12:15 -0400 | [diff] [blame] | 57 | QCA_HDR_XMIT_FROM_CPU | BIT(dp->index); |
John Crispin | cafdc45 | 2016-09-15 16:26:40 +0200 | [diff] [blame] | 58 | |
| 59 | *phdr = htons(hdr); |
| 60 | |
| 61 | return skb; |
John Crispin | cafdc45 | 2016-09-15 16:26:40 +0200 | [diff] [blame] | 62 | } |
| 63 | |
Florian Fainelli | a86d8be | 2017-04-08 08:55:23 -0700 | [diff] [blame] | 64 | static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev, |
Florian Westphal | 89e4950 | 2017-08-17 16:47:00 +0200 | [diff] [blame] | 65 | struct packet_type *pt) |
John Crispin | cafdc45 | 2016-09-15 16:26:40 +0200 | [diff] [blame] | 66 | { |
John Crispin | cafdc45 | 2016-09-15 16:26:40 +0200 | [diff] [blame] | 67 | u8 ver; |
| 68 | int port; |
| 69 | __be16 *phdr, hdr; |
| 70 | |
John Crispin | cafdc45 | 2016-09-15 16:26:40 +0200 | [diff] [blame] | 71 | if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN))) |
Vivien Didelot | 5470979 | 2017-06-01 16:07:14 -0400 | [diff] [blame] | 72 | return NULL; |
John Crispin | cafdc45 | 2016-09-15 16:26:40 +0200 | [diff] [blame] | 73 | |
| 74 | /* The QCA header is added by the switch between src addr and Ethertype |
| 75 | * At this point, skb->data points to ethertype so header should be |
| 76 | * right before |
| 77 | */ |
| 78 | phdr = (__be16 *)(skb->data - 2); |
| 79 | hdr = ntohs(*phdr); |
| 80 | |
| 81 | /* Make sure the version is correct */ |
| 82 | ver = (hdr & QCA_HDR_RECV_VERSION_MASK) >> QCA_HDR_RECV_VERSION_S; |
| 83 | if (unlikely(ver != QCA_HDR_VERSION)) |
Vivien Didelot | 5470979 | 2017-06-01 16:07:14 -0400 | [diff] [blame] | 84 | return NULL; |
John Crispin | cafdc45 | 2016-09-15 16:26:40 +0200 | [diff] [blame] | 85 | |
| 86 | /* Remove QCA tag and recalculate checksum */ |
| 87 | skb_pull_rcsum(skb, QCA_HDR_LEN); |
| 88 | memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - QCA_HDR_LEN, |
| 89 | ETH_HLEN - QCA_HDR_LEN); |
| 90 | |
John Crispin | cafdc45 | 2016-09-15 16:26:40 +0200 | [diff] [blame] | 91 | /* Get source port information */ |
| 92 | port = (hdr & QCA_HDR_RECV_SOURCE_PORT_MASK); |
John Crispin | cafdc45 | 2016-09-15 16:26:40 +0200 | [diff] [blame] | 93 | |
Vivien Didelot | 2231c43 | 2017-10-16 11:12:17 -0400 | [diff] [blame] | 94 | skb->dev = dsa_master_find_slave(dev, 0, port); |
Vivien Didelot | 3775b1b | 2017-09-29 17:19:15 -0400 | [diff] [blame] | 95 | if (!skb->dev) |
| 96 | return NULL; |
John Crispin | cafdc45 | 2016-09-15 16:26:40 +0200 | [diff] [blame] | 97 | |
Florian Fainelli | a86d8be | 2017-04-08 08:55:23 -0700 | [diff] [blame] | 98 | return skb; |
John Crispin | cafdc45 | 2016-09-15 16:26:40 +0200 | [diff] [blame] | 99 | } |
| 100 | |
| 101 | const struct dsa_device_ops qca_netdev_ops = { |
| 102 | .xmit = qca_tag_xmit, |
| 103 | .rcv = qca_tag_rcv, |
| 104 | }; |