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Commit | Line | Data |
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876c9d3a MT |
1 | /** |
2 | * This file contains the handling of RX in wlan driver. | |
3 | */ | |
4 | #include <linux/etherdevice.h> | |
5 | #include <linux/types.h> | |
6 | ||
9e66e701 | 7 | #include "host.h" |
876c9d3a MT |
8 | #include "radiotap.h" |
9 | #include "decl.h" | |
10 | #include "dev.h" | |
11 | #include "wext.h" | |
12 | ||
13 | struct eth803hdr { | |
14 | u8 dest_addr[6]; | |
15 | u8 src_addr[6]; | |
16 | u16 h803_len; | |
17 | } __attribute__ ((packed)); | |
18 | ||
19 | struct rfc1042hdr { | |
20 | u8 llc_dsap; | |
21 | u8 llc_ssap; | |
22 | u8 llc_ctrl; | |
23 | u8 snap_oui[3]; | |
24 | u16 snap_type; | |
25 | } __attribute__ ((packed)); | |
26 | ||
27 | struct rxpackethdr { | |
876c9d3a MT |
28 | struct eth803hdr eth803_hdr; |
29 | struct rfc1042hdr rfc1042_hdr; | |
30 | } __attribute__ ((packed)); | |
31 | ||
32 | struct rx80211packethdr { | |
33 | struct rxpd rx_pd; | |
34 | void *eth80211_hdr; | |
35 | } __attribute__ ((packed)); | |
36 | ||
69f9032d HS |
37 | static int process_rxed_802_11_packet(struct lbs_private *priv, |
38 | struct sk_buff *skb); | |
876c9d3a MT |
39 | |
40 | /** | |
41 | * @brief This function computes the avgSNR . | |
42 | * | |
69f9032d | 43 | * @param priv A pointer to struct lbs_private structure |
876c9d3a MT |
44 | * @return avgSNR |
45 | */ | |
69f9032d | 46 | static u8 lbs_getavgsnr(struct lbs_private *priv) |
876c9d3a MT |
47 | { |
48 | u8 i; | |
49 | u16 temp = 0; | |
aa21c004 | 50 | if (priv->numSNRNF == 0) |
876c9d3a | 51 | return 0; |
aa21c004 DW |
52 | for (i = 0; i < priv->numSNRNF; i++) |
53 | temp += priv->rawSNR[i]; | |
54 | return (u8) (temp / priv->numSNRNF); | |
876c9d3a MT |
55 | |
56 | } | |
57 | ||
58 | /** | |
59 | * @brief This function computes the AvgNF | |
60 | * | |
69f9032d | 61 | * @param priv A pointer to struct lbs_private structure |
876c9d3a MT |
62 | * @return AvgNF |
63 | */ | |
69f9032d | 64 | static u8 lbs_getavgnf(struct lbs_private *priv) |
876c9d3a MT |
65 | { |
66 | u8 i; | |
67 | u16 temp = 0; | |
aa21c004 | 68 | if (priv->numSNRNF == 0) |
876c9d3a | 69 | return 0; |
aa21c004 DW |
70 | for (i = 0; i < priv->numSNRNF; i++) |
71 | temp += priv->rawNF[i]; | |
72 | return (u8) (temp / priv->numSNRNF); | |
876c9d3a MT |
73 | |
74 | } | |
75 | ||
76 | /** | |
77 | * @brief This function save the raw SNR/NF to our internel buffer | |
78 | * | |
69f9032d | 79 | * @param priv A pointer to struct lbs_private structure |
876c9d3a MT |
80 | * @param prxpd A pointer to rxpd structure of received packet |
81 | * @return n/a | |
82 | */ | |
69f9032d | 83 | static void lbs_save_rawSNRNF(struct lbs_private *priv, struct rxpd *p_rx_pd) |
876c9d3a | 84 | { |
aa21c004 DW |
85 | if (priv->numSNRNF < DEFAULT_DATA_AVG_FACTOR) |
86 | priv->numSNRNF++; | |
87 | priv->rawSNR[priv->nextSNRNF] = p_rx_pd->snr; | |
88 | priv->rawNF[priv->nextSNRNF] = p_rx_pd->nf; | |
89 | priv->nextSNRNF++; | |
90 | if (priv->nextSNRNF >= DEFAULT_DATA_AVG_FACTOR) | |
91 | priv->nextSNRNF = 0; | |
876c9d3a MT |
92 | return; |
93 | } | |
94 | ||
95 | /** | |
96 | * @brief This function computes the RSSI in received packet. | |
97 | * | |
69f9032d | 98 | * @param priv A pointer to struct lbs_private structure |
876c9d3a MT |
99 | * @param prxpd A pointer to rxpd structure of received packet |
100 | * @return n/a | |
101 | */ | |
69f9032d | 102 | static void lbs_compute_rssi(struct lbs_private *priv, struct rxpd *p_rx_pd) |
876c9d3a | 103 | { |
876c9d3a | 104 | |
9012b28a | 105 | lbs_deb_enter(LBS_DEB_RX); |
876c9d3a | 106 | |
9012b28a HS |
107 | lbs_deb_rx("rxpd: SNR %d, NF %d\n", p_rx_pd->snr, p_rx_pd->nf); |
108 | lbs_deb_rx("before computing SNR: SNR-avg = %d, NF-avg = %d\n", | |
aa21c004 DW |
109 | priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE, |
110 | priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE); | |
876c9d3a | 111 | |
aa21c004 DW |
112 | priv->SNR[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->snr; |
113 | priv->NF[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->nf; | |
10078321 | 114 | lbs_save_rawSNRNF(priv, p_rx_pd); |
876c9d3a | 115 | |
aa21c004 DW |
116 | priv->SNR[TYPE_RXPD][TYPE_AVG] = lbs_getavgsnr(priv) * AVG_SCALE; |
117 | priv->NF[TYPE_RXPD][TYPE_AVG] = lbs_getavgnf(priv) * AVG_SCALE; | |
9012b28a | 118 | lbs_deb_rx("after computing SNR: SNR-avg = %d, NF-avg = %d\n", |
aa21c004 DW |
119 | priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE, |
120 | priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE); | |
876c9d3a | 121 | |
aa21c004 DW |
122 | priv->RSSI[TYPE_RXPD][TYPE_NOAVG] = |
123 | CAL_RSSI(priv->SNR[TYPE_RXPD][TYPE_NOAVG], | |
124 | priv->NF[TYPE_RXPD][TYPE_NOAVG]); | |
876c9d3a | 125 | |
aa21c004 DW |
126 | priv->RSSI[TYPE_RXPD][TYPE_AVG] = |
127 | CAL_RSSI(priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE, | |
128 | priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE); | |
876c9d3a | 129 | |
9012b28a | 130 | lbs_deb_leave(LBS_DEB_RX); |
876c9d3a MT |
131 | } |
132 | ||
876c9d3a MT |
133 | /** |
134 | * @brief This function processes received packet and forwards it | |
135 | * to kernel/upper layer | |
136 | * | |
69f9032d | 137 | * @param priv A pointer to struct lbs_private |
876c9d3a MT |
138 | * @param skb A pointer to skb which includes the received packet |
139 | * @return 0 or -1 | |
140 | */ | |
69f9032d | 141 | int lbs_process_rxed_packet(struct lbs_private *priv, struct sk_buff *skb) |
876c9d3a | 142 | { |
876c9d3a | 143 | int ret = 0; |
6f93a8e7 | 144 | struct net_device *dev = priv->dev; |
876c9d3a MT |
145 | struct rxpackethdr *p_rx_pkt; |
146 | struct rxpd *p_rx_pd; | |
876c9d3a MT |
147 | int hdrchop; |
148 | struct ethhdr *p_ethhdr; | |
876c9d3a MT |
149 | const u8 rfc1042_eth_hdr[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; |
150 | ||
9012b28a | 151 | lbs_deb_enter(LBS_DEB_RX); |
876c9d3a | 152 | |
7919b89c HS |
153 | BUG_ON(!skb); |
154 | ||
6f93a8e7 DW |
155 | skb->ip_summed = CHECKSUM_NONE; |
156 | ||
c2b310a7 | 157 | if (priv->monitormode) |
876c9d3a MT |
158 | return process_rxed_802_11_packet(priv, skb); |
159 | ||
e45d8e53 BZ |
160 | p_rx_pd = (struct rxpd *) skb->data; |
161 | p_rx_pkt = (struct rxpackethdr *) ((u8 *)p_rx_pd + | |
162 | le32_to_cpu(p_rx_pd->pkt_ptr)); | |
684d6b36 BZ |
163 | if (priv->mesh_dev) { |
164 | if (priv->mesh_fw_ver == MESH_FW_OLD) { | |
165 | if (p_rx_pd->rx_control & RxPD_MESH_FRAME) | |
166 | dev = priv->mesh_dev; | |
167 | } else if (priv->mesh_fw_ver == MESH_FW_NEW) { | |
168 | if (p_rx_pd->u.bss.bss_num == MESH_IFACE_ID) | |
169 | dev = priv->mesh_dev; | |
170 | } | |
171 | } | |
876c9d3a | 172 | |
ece56191 | 173 | lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, |
876c9d3a MT |
174 | min_t(unsigned int, skb->len, 100)); |
175 | ||
176 | if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) { | |
9012b28a | 177 | lbs_deb_rx("rx err: frame received with bad length\n"); |
bbfc6b78 | 178 | dev->stats.rx_length_errors++; |
876c9d3a | 179 | ret = 0; |
f54930f3 | 180 | dev_kfree_skb(skb); |
876c9d3a MT |
181 | goto done; |
182 | } | |
183 | ||
e45d8e53 | 184 | lbs_deb_rx("rx data: skb->len - pkt_ptr = %d-%zd = %zd\n", |
a2caba6b JL |
185 | skb->len, (size_t)le32_to_cpu(p_rx_pd->pkt_ptr), |
186 | skb->len - (size_t)le32_to_cpu(p_rx_pd->pkt_ptr)); | |
876c9d3a | 187 | |
ece56191 | 188 | lbs_deb_hex(LBS_DEB_RX, "RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr, |
876c9d3a | 189 | sizeof(p_rx_pkt->eth803_hdr.dest_addr)); |
ece56191 | 190 | lbs_deb_hex(LBS_DEB_RX, "RX Data: Src", p_rx_pkt->eth803_hdr.src_addr, |
876c9d3a MT |
191 | sizeof(p_rx_pkt->eth803_hdr.src_addr)); |
192 | ||
193 | if (memcmp(&p_rx_pkt->rfc1042_hdr, | |
194 | rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) { | |
195 | /* | |
196 | * Replace the 803 header and rfc1042 header (llc/snap) with an | |
197 | * EthernetII header, keep the src/dst and snap_type (ethertype) | |
198 | * | |
199 | * The firmware only passes up SNAP frames converting | |
200 | * all RX Data from 802.11 to 802.2/LLC/SNAP frames. | |
201 | * | |
202 | * To create the Ethernet II, just move the src, dst address right | |
203 | * before the snap_type. | |
204 | */ | |
205 | p_ethhdr = (struct ethhdr *) | |
206 | ((u8 *) & p_rx_pkt->eth803_hdr | |
207 | + sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr) | |
208 | - sizeof(p_rx_pkt->eth803_hdr.dest_addr) | |
209 | - sizeof(p_rx_pkt->eth803_hdr.src_addr) | |
210 | - sizeof(p_rx_pkt->rfc1042_hdr.snap_type)); | |
211 | ||
212 | memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr, | |
213 | sizeof(p_ethhdr->h_source)); | |
214 | memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr, | |
215 | sizeof(p_ethhdr->h_dest)); | |
216 | ||
217 | /* Chop off the rxpd + the excess memory from the 802.2/llc/snap header | |
218 | * that was removed | |
219 | */ | |
e45d8e53 | 220 | hdrchop = (u8 *)p_ethhdr - (u8 *)p_rx_pd; |
876c9d3a | 221 | } else { |
ece56191 | 222 | lbs_deb_hex(LBS_DEB_RX, "RX Data: LLC/SNAP", |
876c9d3a MT |
223 | (u8 *) & p_rx_pkt->rfc1042_hdr, |
224 | sizeof(p_rx_pkt->rfc1042_hdr)); | |
225 | ||
226 | /* Chop off the rxpd */ | |
e45d8e53 | 227 | hdrchop = (u8 *)&p_rx_pkt->eth803_hdr - (u8 *)p_rx_pd; |
876c9d3a MT |
228 | } |
229 | ||
230 | /* Chop off the leading header bytes so the skb points to the start of | |
231 | * either the reconstructed EthII frame or the 802.2/llc/snap frame | |
232 | */ | |
233 | skb_pull(skb, hdrchop); | |
234 | ||
235 | /* Take the data rate from the rxpd structure | |
236 | * only if the rate is auto | |
237 | */ | |
85319f93 | 238 | if (priv->enablehwauto) |
aa21c004 | 239 | priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate); |
876c9d3a | 240 | |
10078321 | 241 | lbs_compute_rssi(priv, p_rx_pd); |
876c9d3a | 242 | |
9012b28a | 243 | lbs_deb_rx("rx data: size of actual packet %d\n", skb->len); |
bbfc6b78 SH |
244 | dev->stats.rx_bytes += skb->len; |
245 | dev->stats.rx_packets++; | |
876c9d3a | 246 | |
6f93a8e7 | 247 | skb->protocol = eth_type_trans(skb, dev); |
ae3e0fcf HS |
248 | if (in_interrupt()) |
249 | netif_rx(skb); | |
250 | else | |
251 | netif_rx_ni(skb); | |
3d4bd24b | 252 | |
876c9d3a MT |
253 | ret = 0; |
254 | done: | |
9012b28a | 255 | lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret); |
876c9d3a MT |
256 | return ret; |
257 | } | |
10078321 | 258 | EXPORT_SYMBOL_GPL(lbs_process_rxed_packet); |
876c9d3a MT |
259 | |
260 | /** | |
261 | * @brief This function converts Tx/Rx rates from the Marvell WLAN format | |
262 | * (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s) | |
263 | * | |
264 | * @param rate Input rate | |
265 | * @return Output Rate (0 if invalid) | |
266 | */ | |
267 | static u8 convert_mv_rate_to_radiotap(u8 rate) | |
268 | { | |
269 | switch (rate) { | |
270 | case 0: /* 1 Mbps */ | |
271 | return 2; | |
272 | case 1: /* 2 Mbps */ | |
273 | return 4; | |
274 | case 2: /* 5.5 Mbps */ | |
275 | return 11; | |
276 | case 3: /* 11 Mbps */ | |
277 | return 22; | |
965f8bbc LCC |
278 | /* case 4: reserved */ |
279 | case 5: /* 6 Mbps */ | |
876c9d3a | 280 | return 12; |
965f8bbc | 281 | case 6: /* 9 Mbps */ |
876c9d3a | 282 | return 18; |
965f8bbc | 283 | case 7: /* 12 Mbps */ |
876c9d3a | 284 | return 24; |
965f8bbc | 285 | case 8: /* 18 Mbps */ |
876c9d3a | 286 | return 36; |
965f8bbc | 287 | case 9: /* 24 Mbps */ |
876c9d3a | 288 | return 48; |
965f8bbc | 289 | case 10: /* 36 Mbps */ |
876c9d3a | 290 | return 72; |
965f8bbc | 291 | case 11: /* 48 Mbps */ |
876c9d3a | 292 | return 96; |
965f8bbc | 293 | case 12: /* 54 Mbps */ |
876c9d3a MT |
294 | return 108; |
295 | } | |
9012b28a | 296 | lbs_pr_alert("Invalid Marvell WLAN rate %i\n", rate); |
876c9d3a MT |
297 | return 0; |
298 | } | |
299 | ||
300 | /** | |
301 | * @brief This function processes a received 802.11 packet and forwards it | |
302 | * to kernel/upper layer | |
303 | * | |
69f9032d | 304 | * @param priv A pointer to struct lbs_private |
876c9d3a MT |
305 | * @param skb A pointer to skb which includes the received packet |
306 | * @return 0 or -1 | |
307 | */ | |
69f9032d HS |
308 | static int process_rxed_802_11_packet(struct lbs_private *priv, |
309 | struct sk_buff *skb) | |
876c9d3a | 310 | { |
876c9d3a | 311 | int ret = 0; |
bbfc6b78 | 312 | struct net_device *dev = priv->dev; |
876c9d3a MT |
313 | struct rx80211packethdr *p_rx_pkt; |
314 | struct rxpd *prxpd; | |
315 | struct rx_radiotap_hdr radiotap_hdr; | |
316 | struct rx_radiotap_hdr *pradiotap_hdr; | |
317 | ||
9012b28a | 318 | lbs_deb_enter(LBS_DEB_RX); |
876c9d3a MT |
319 | |
320 | p_rx_pkt = (struct rx80211packethdr *) skb->data; | |
321 | prxpd = &p_rx_pkt->rx_pd; | |
322 | ||
ece56191 | 323 | // lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, min(skb->len, 100)); |
876c9d3a MT |
324 | |
325 | if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) { | |
7bf02c29 | 326 | lbs_deb_rx("rx err: frame received with bad length\n"); |
bbfc6b78 | 327 | dev->stats.rx_length_errors++; |
7bf02c29 | 328 | ret = -EINVAL; |
b700a98c | 329 | kfree_skb(skb); |
876c9d3a MT |
330 | goto done; |
331 | } | |
332 | ||
9012b28a | 333 | lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n", |
876c9d3a MT |
334 | skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd)); |
335 | ||
336 | /* create the exported radio header */ | |
876c9d3a | 337 | |
180be755 DW |
338 | /* radiotap header */ |
339 | radiotap_hdr.hdr.it_version = 0; | |
340 | /* XXX must check this value for pad */ | |
341 | radiotap_hdr.hdr.it_pad = 0; | |
342 | radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr)); | |
343 | radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT); | |
180be755 DW |
344 | radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate); |
345 | /* XXX must check no carryout */ | |
346 | radiotap_hdr.antsignal = prxpd->snr + prxpd->nf; | |
180be755 DW |
347 | |
348 | /* chop the rxpd */ | |
349 | skb_pull(skb, sizeof(struct rxpd)); | |
350 | ||
351 | /* add space for the new radio header */ | |
352 | if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) && | |
7bf02c29 DW |
353 | pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0, GFP_ATOMIC)) { |
354 | lbs_pr_alert("%s: couldn't pskb_expand_head\n", __func__); | |
355 | ret = -ENOMEM; | |
356 | kfree_skb(skb); | |
357 | goto done; | |
876c9d3a MT |
358 | } |
359 | ||
180be755 DW |
360 | pradiotap_hdr = (void *)skb_push(skb, sizeof(struct rx_radiotap_hdr)); |
361 | memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr)); | |
362 | ||
876c9d3a MT |
363 | /* Take the data rate from the rxpd structure |
364 | * only if the rate is auto | |
365 | */ | |
85319f93 | 366 | if (priv->enablehwauto) |
aa21c004 | 367 | priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate); |
876c9d3a | 368 | |
10078321 | 369 | lbs_compute_rssi(priv, prxpd); |
876c9d3a | 370 | |
9012b28a | 371 | lbs_deb_rx("rx data: size of actual packet %d\n", skb->len); |
bbfc6b78 SH |
372 | dev->stats.rx_bytes += skb->len; |
373 | dev->stats.rx_packets++; | |
876c9d3a | 374 | |
6f93a8e7 DW |
375 | skb->protocol = eth_type_trans(skb, priv->rtap_net_dev); |
376 | netif_rx(skb); | |
3d4bd24b | 377 | |
876c9d3a | 378 | ret = 0; |
876c9d3a | 379 | |
9012b28a | 380 | done: |
9012b28a HS |
381 | lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret); |
382 | return ret; | |
876c9d3a | 383 | } |