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Randy Dunlap8973a6e2011-04-26 15:25:29 -07001/*
2 * This file contains the handling of RX in wlan driver.
3 */
Joe Perches0e4e06a2011-05-02 16:49:14 -07004
5#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
6
Marcelo Tosatti876c9d32007-02-10 12:25:27 -02007#include <linux/etherdevice.h>
Alexey Dobriyana6b7a402011-06-06 10:43:46 +00008#include <linux/hardirq.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09009#include <linux/slab.h>
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020010#include <linux/types.h>
Paul Gortmakeree40fa02011-05-27 16:14:23 -040011#include <linux/export.h>
Kiran Divekare86dc1c2010-06-14 22:01:26 +053012#include <net/cfg80211.h>
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020013
Kiran Divekare86dc1c2010-06-14 22:01:26 +053014#include "defs.h"
Holger Schurig9e66e702009-10-16 17:32:16 +020015#include "host.h"
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020016#include "radiotap.h"
17#include "decl.h"
18#include "dev.h"
Daniel Drake49fee692011-07-21 20:43:17 +010019#include "mesh.h"
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020020
21struct eth803hdr {
22 u8 dest_addr[6];
23 u8 src_addr[6];
24 u16 h803_len;
Eric Dumazetba2d3582010-06-02 18:10:09 +000025} __packed;
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020026
27struct rfc1042hdr {
28 u8 llc_dsap;
29 u8 llc_ssap;
30 u8 llc_ctrl;
31 u8 snap_oui[3];
32 u16 snap_type;
Eric Dumazetba2d3582010-06-02 18:10:09 +000033} __packed;
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020034
35struct rxpackethdr {
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020036 struct eth803hdr eth803_hdr;
37 struct rfc1042hdr rfc1042_hdr;
Eric Dumazetba2d3582010-06-02 18:10:09 +000038} __packed;
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020039
40struct rx80211packethdr {
41 struct rxpd rx_pd;
42 void *eth80211_hdr;
Eric Dumazetba2d3582010-06-02 18:10:09 +000043} __packed;
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020044
Holger Schurig69f90322007-11-23 15:43:44 +010045static int process_rxed_802_11_packet(struct lbs_private *priv,
46 struct sk_buff *skb);
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020047
48/**
Randy Dunlap8973a6e2011-04-26 15:25:29 -070049 * lbs_process_rxed_packet - processes received packet and forwards it
50 * to kernel/upper layer
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020051 *
Randy Dunlap8973a6e2011-04-26 15:25:29 -070052 * @priv: A pointer to &struct lbs_private
53 * @skb: A pointer to skb which includes the received packet
54 * returns: 0 or -1
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020055 */
Holger Schurig69f90322007-11-23 15:43:44 +010056int lbs_process_rxed_packet(struct lbs_private *priv, struct sk_buff *skb)
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020057{
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020058 int ret = 0;
David Woodhouse6f93a8e2007-12-10 00:49:26 -050059 struct net_device *dev = priv->dev;
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020060 struct rxpackethdr *p_rx_pkt;
61 struct rxpd *p_rx_pd;
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020062 int hdrchop;
63 struct ethhdr *p_ethhdr;
Joe Perches482e0392010-11-20 18:38:58 -080064 static const u8 rfc1042_eth_hdr[] = {
65 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00
66 };
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020067
Holger Schurig9012b282007-05-25 11:27:16 -040068 lbs_deb_enter(LBS_DEB_RX);
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020069
Holger Schurig7919b892008-04-01 14:50:43 +020070 BUG_ON(!skb);
71
David Woodhouse6f93a8e2007-12-10 00:49:26 -050072 skb->ip_summed = CHECKSUM_NONE;
73
Kiran Divekare86dc1c2010-06-14 22:01:26 +053074 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR)
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020075 return process_rxed_802_11_packet(priv, skb);
76
Bing Zhaoe45d8e52009-04-06 15:50:56 -070077 p_rx_pd = (struct rxpd *) skb->data;
78 p_rx_pkt = (struct rxpackethdr *) ((u8 *)p_rx_pd +
79 le32_to_cpu(p_rx_pd->pkt_ptr));
Holger Schurige0e42da2009-11-25 13:10:15 +010080
81 dev = lbs_mesh_set_dev(priv, dev, p_rx_pd);
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020082
Holger Schurigece56192007-08-02 11:53:06 -040083 lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data,
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020084 min_t(unsigned int, skb->len, 100));
85
86 if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
Holger Schurig9012b282007-05-25 11:27:16 -040087 lbs_deb_rx("rx err: frame received with bad length\n");
Stephen Hemmingerbbfc6b72009-03-20 19:36:36 +000088 dev->stats.rx_length_errors++;
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020089 ret = 0;
Philip Rakityf54930f2009-04-07 12:41:17 -070090 dev_kfree_skb(skb);
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020091 goto done;
92 }
93
Bing Zhaoe45d8e52009-04-06 15:50:56 -070094 lbs_deb_rx("rx data: skb->len - pkt_ptr = %d-%zd = %zd\n",
John W. Linvillea2caba62009-04-14 11:45:57 -040095 skb->len, (size_t)le32_to_cpu(p_rx_pd->pkt_ptr),
96 skb->len - (size_t)le32_to_cpu(p_rx_pd->pkt_ptr));
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020097
Holger Schurigece56192007-08-02 11:53:06 -040098 lbs_deb_hex(LBS_DEB_RX, "RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
Marcelo Tosatti876c9d32007-02-10 12:25:27 -020099 sizeof(p_rx_pkt->eth803_hdr.dest_addr));
Holger Schurigece56192007-08-02 11:53:06 -0400100 lbs_deb_hex(LBS_DEB_RX, "RX Data: Src", p_rx_pkt->eth803_hdr.src_addr,
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200101 sizeof(p_rx_pkt->eth803_hdr.src_addr));
102
103 if (memcmp(&p_rx_pkt->rfc1042_hdr,
104 rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) {
105 /*
106 * Replace the 803 header and rfc1042 header (llc/snap) with an
107 * EthernetII header, keep the src/dst and snap_type (ethertype)
108 *
109 * The firmware only passes up SNAP frames converting
110 * all RX Data from 802.11 to 802.2/LLC/SNAP frames.
111 *
112 * To create the Ethernet II, just move the src, dst address right
113 * before the snap_type.
114 */
115 p_ethhdr = (struct ethhdr *)
Stewart Malik819cf152010-03-11 20:28:29 +1030116 ((u8 *) &p_rx_pkt->eth803_hdr
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200117 + sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr)
118 - sizeof(p_rx_pkt->eth803_hdr.dest_addr)
119 - sizeof(p_rx_pkt->eth803_hdr.src_addr)
120 - sizeof(p_rx_pkt->rfc1042_hdr.snap_type));
121
122 memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr,
123 sizeof(p_ethhdr->h_source));
124 memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr,
125 sizeof(p_ethhdr->h_dest));
126
127 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap header
128 * that was removed
129 */
Bing Zhaoe45d8e52009-04-06 15:50:56 -0700130 hdrchop = (u8 *)p_ethhdr - (u8 *)p_rx_pd;
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200131 } else {
Holger Schurigece56192007-08-02 11:53:06 -0400132 lbs_deb_hex(LBS_DEB_RX, "RX Data: LLC/SNAP",
Stewart Malik819cf152010-03-11 20:28:29 +1030133 (u8 *) &p_rx_pkt->rfc1042_hdr,
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200134 sizeof(p_rx_pkt->rfc1042_hdr));
135
136 /* Chop off the rxpd */
Bing Zhaoe45d8e52009-04-06 15:50:56 -0700137 hdrchop = (u8 *)&p_rx_pkt->eth803_hdr - (u8 *)p_rx_pd;
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200138 }
139
140 /* Chop off the leading header bytes so the skb points to the start of
141 * either the reconstructed EthII frame or the 802.2/llc/snap frame
142 */
143 skb_pull(skb, hdrchop);
144
Kiran Divekare86dc1c2010-06-14 22:01:26 +0530145 priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate);
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200146
Holger Schurig9012b282007-05-25 11:27:16 -0400147 lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
Stephen Hemmingerbbfc6b72009-03-20 19:36:36 +0000148 dev->stats.rx_bytes += skb->len;
149 dev->stats.rx_packets++;
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200150
David Woodhouse6f93a8e2007-12-10 00:49:26 -0500151 skb->protocol = eth_type_trans(skb, dev);
Holger Schurigae3e0fc2008-01-16 15:48:44 +0100152 if (in_interrupt())
153 netif_rx(skb);
154 else
155 netif_rx_ni(skb);
Florin Malita3d4bd242007-05-18 16:04:33 -0400156
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200157 ret = 0;
158done:
Holger Schurig9012b282007-05-25 11:27:16 -0400159 lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200160 return ret;
161}
Holger Schurig10078322007-11-15 18:05:47 -0500162EXPORT_SYMBOL_GPL(lbs_process_rxed_packet);
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200163
164/**
Randy Dunlap8973a6e2011-04-26 15:25:29 -0700165 * convert_mv_rate_to_radiotap - converts Tx/Rx rates from Marvell WLAN format
166 * (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200167 *
Randy Dunlap8973a6e2011-04-26 15:25:29 -0700168 * @rate: Input rate
169 * returns: Output Rate (0 if invalid)
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200170 */
171static u8 convert_mv_rate_to_radiotap(u8 rate)
172{
173 switch (rate) {
174 case 0: /* 1 Mbps */
175 return 2;
176 case 1: /* 2 Mbps */
177 return 4;
178 case 2: /* 5.5 Mbps */
179 return 11;
180 case 3: /* 11 Mbps */
181 return 22;
Luis Carlos Cobo965f8bbc2007-08-02 13:16:55 -0400182 /* case 4: reserved */
183 case 5: /* 6 Mbps */
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200184 return 12;
Luis Carlos Cobo965f8bbc2007-08-02 13:16:55 -0400185 case 6: /* 9 Mbps */
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200186 return 18;
Luis Carlos Cobo965f8bbc2007-08-02 13:16:55 -0400187 case 7: /* 12 Mbps */
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200188 return 24;
Luis Carlos Cobo965f8bbc2007-08-02 13:16:55 -0400189 case 8: /* 18 Mbps */
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200190 return 36;
Luis Carlos Cobo965f8bbc2007-08-02 13:16:55 -0400191 case 9: /* 24 Mbps */
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200192 return 48;
Luis Carlos Cobo965f8bbc2007-08-02 13:16:55 -0400193 case 10: /* 36 Mbps */
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200194 return 72;
Luis Carlos Cobo965f8bbc2007-08-02 13:16:55 -0400195 case 11: /* 48 Mbps */
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200196 return 96;
Luis Carlos Cobo965f8bbc2007-08-02 13:16:55 -0400197 case 12: /* 54 Mbps */
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200198 return 108;
199 }
Joe Perches0e4e06a2011-05-02 16:49:14 -0700200 pr_alert("Invalid Marvell WLAN rate %i\n", rate);
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200201 return 0;
202}
203
204/**
Randy Dunlap8973a6e2011-04-26 15:25:29 -0700205 * process_rxed_802_11_packet - processes a received 802.11 packet and forwards
206 * it to kernel/upper layer
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200207 *
Randy Dunlap8973a6e2011-04-26 15:25:29 -0700208 * @priv: A pointer to &struct lbs_private
209 * @skb: A pointer to skb which includes the received packet
210 * returns: 0 or -1
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200211 */
Holger Schurig69f90322007-11-23 15:43:44 +0100212static int process_rxed_802_11_packet(struct lbs_private *priv,
213 struct sk_buff *skb)
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200214{
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200215 int ret = 0;
Stephen Hemmingerbbfc6b72009-03-20 19:36:36 +0000216 struct net_device *dev = priv->dev;
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200217 struct rx80211packethdr *p_rx_pkt;
218 struct rxpd *prxpd;
219 struct rx_radiotap_hdr radiotap_hdr;
220 struct rx_radiotap_hdr *pradiotap_hdr;
221
Holger Schurig9012b282007-05-25 11:27:16 -0400222 lbs_deb_enter(LBS_DEB_RX);
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200223
224 p_rx_pkt = (struct rx80211packethdr *) skb->data;
225 prxpd = &p_rx_pkt->rx_pd;
226
Stewart Malik819cf152010-03-11 20:28:29 +1030227 /* lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, min(skb->len, 100)); */
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200228
229 if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
David Woodhouse7bf02c22007-12-10 00:17:28 -0500230 lbs_deb_rx("rx err: frame received with bad length\n");
Stephen Hemmingerbbfc6b72009-03-20 19:36:36 +0000231 dev->stats.rx_length_errors++;
David Woodhouse7bf02c22007-12-10 00:17:28 -0500232 ret = -EINVAL;
Sergio Luisb700a982008-10-26 23:09:27 -0700233 kfree_skb(skb);
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200234 goto done;
235 }
236
Holger Schurig9012b282007-05-25 11:27:16 -0400237 lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200238 skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
239
240 /* create the exported radio header */
David Woodhouse180be752007-12-10 00:05:37 -0500241
242 /* radiotap header */
Prarit Bhargavac6a63682010-05-27 14:41:20 -0400243 memset(&radiotap_hdr, 0, sizeof(radiotap_hdr));
244 /* XXX must check radiotap_hdr.hdr.it_pad for pad */
David Woodhouse180be752007-12-10 00:05:37 -0500245 radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr));
246 radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT);
David Woodhouse180be752007-12-10 00:05:37 -0500247 radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
248 /* XXX must check no carryout */
249 radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
David Woodhouse180be752007-12-10 00:05:37 -0500250
251 /* chop the rxpd */
252 skb_pull(skb, sizeof(struct rxpd));
253
254 /* add space for the new radio header */
255 if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&
David Woodhouse7bf02c22007-12-10 00:17:28 -0500256 pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0, GFP_ATOMIC)) {
Joe Perchesf3a57fd2011-05-02 16:49:15 -0700257 netdev_alert(dev, "%s: couldn't pskb_expand_head\n", __func__);
David Woodhouse7bf02c22007-12-10 00:17:28 -0500258 ret = -ENOMEM;
259 kfree_skb(skb);
260 goto done;
Luis Carlos Cobo965f8bbc2007-08-02 13:16:55 -0400261 }
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200262
David Woodhouse180be752007-12-10 00:05:37 -0500263 pradiotap_hdr = (void *)skb_push(skb, sizeof(struct rx_radiotap_hdr));
264 memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr));
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200265
Kiran Divekare86dc1c2010-06-14 22:01:26 +0530266 priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate);
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200267
Holger Schurig9012b282007-05-25 11:27:16 -0400268 lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
Stephen Hemmingerbbfc6b72009-03-20 19:36:36 +0000269 dev->stats.rx_bytes += skb->len;
270 dev->stats.rx_packets++;
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200271
Kiran Divekare86dc1c2010-06-14 22:01:26 +0530272 skb->protocol = eth_type_trans(skb, priv->dev);
273
274 if (in_interrupt())
275 netif_rx(skb);
276 else
277 netif_rx_ni(skb);
Florin Malita3d4bd242007-05-18 16:04:33 -0400278
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200279 ret = 0;
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200280
Holger Schurig9012b282007-05-25 11:27:16 -0400281done:
Holger Schurig9012b282007-05-25 11:27:16 -0400282 lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
283 return ret;
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200284}