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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 | ||
7 | #include "hostcmd.h" | |
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 { | |
28 | struct rxpd rx_pd; | |
29 | struct eth803hdr eth803_hdr; | |
30 | struct rfc1042hdr rfc1042_hdr; | |
31 | } __attribute__ ((packed)); | |
32 | ||
33 | struct rx80211packethdr { | |
34 | struct rxpd rx_pd; | |
35 | void *eth80211_hdr; | |
36 | } __attribute__ ((packed)); | |
37 | ||
69f9032d HS |
38 | static int process_rxed_802_11_packet(struct lbs_private *priv, |
39 | struct sk_buff *skb); | |
876c9d3a MT |
40 | |
41 | /** | |
42 | * @brief This function computes the avgSNR . | |
43 | * | |
69f9032d | 44 | * @param priv A pointer to struct lbs_private structure |
876c9d3a MT |
45 | * @return avgSNR |
46 | */ | |
69f9032d | 47 | static u8 lbs_getavgsnr(struct lbs_private *priv) |
876c9d3a MT |
48 | { |
49 | u8 i; | |
50 | u16 temp = 0; | |
aa21c004 | 51 | if (priv->numSNRNF == 0) |
876c9d3a | 52 | return 0; |
aa21c004 DW |
53 | for (i = 0; i < priv->numSNRNF; i++) |
54 | temp += priv->rawSNR[i]; | |
55 | return (u8) (temp / priv->numSNRNF); | |
876c9d3a MT |
56 | |
57 | } | |
58 | ||
59 | /** | |
60 | * @brief This function computes the AvgNF | |
61 | * | |
69f9032d | 62 | * @param priv A pointer to struct lbs_private structure |
876c9d3a MT |
63 | * @return AvgNF |
64 | */ | |
69f9032d | 65 | static u8 lbs_getavgnf(struct lbs_private *priv) |
876c9d3a MT |
66 | { |
67 | u8 i; | |
68 | u16 temp = 0; | |
aa21c004 | 69 | if (priv->numSNRNF == 0) |
876c9d3a | 70 | return 0; |
aa21c004 DW |
71 | for (i = 0; i < priv->numSNRNF; i++) |
72 | temp += priv->rawNF[i]; | |
73 | return (u8) (temp / priv->numSNRNF); | |
876c9d3a MT |
74 | |
75 | } | |
76 | ||
77 | /** | |
78 | * @brief This function save the raw SNR/NF to our internel buffer | |
79 | * | |
69f9032d | 80 | * @param priv A pointer to struct lbs_private structure |
876c9d3a MT |
81 | * @param prxpd A pointer to rxpd structure of received packet |
82 | * @return n/a | |
83 | */ | |
69f9032d | 84 | static void lbs_save_rawSNRNF(struct lbs_private *priv, struct rxpd *p_rx_pd) |
876c9d3a | 85 | { |
aa21c004 DW |
86 | if (priv->numSNRNF < DEFAULT_DATA_AVG_FACTOR) |
87 | priv->numSNRNF++; | |
88 | priv->rawSNR[priv->nextSNRNF] = p_rx_pd->snr; | |
89 | priv->rawNF[priv->nextSNRNF] = p_rx_pd->nf; | |
90 | priv->nextSNRNF++; | |
91 | if (priv->nextSNRNF >= DEFAULT_DATA_AVG_FACTOR) | |
92 | priv->nextSNRNF = 0; | |
876c9d3a MT |
93 | return; |
94 | } | |
95 | ||
96 | /** | |
97 | * @brief This function computes the RSSI in received packet. | |
98 | * | |
69f9032d | 99 | * @param priv A pointer to struct lbs_private structure |
876c9d3a MT |
100 | * @param prxpd A pointer to rxpd structure of received packet |
101 | * @return n/a | |
102 | */ | |
69f9032d | 103 | static void lbs_compute_rssi(struct lbs_private *priv, struct rxpd *p_rx_pd) |
876c9d3a | 104 | { |
876c9d3a | 105 | |
9012b28a | 106 | lbs_deb_enter(LBS_DEB_RX); |
876c9d3a | 107 | |
9012b28a HS |
108 | lbs_deb_rx("rxpd: SNR %d, NF %d\n", p_rx_pd->snr, p_rx_pd->nf); |
109 | lbs_deb_rx("before computing SNR: SNR-avg = %d, NF-avg = %d\n", | |
aa21c004 DW |
110 | priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE, |
111 | priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE); | |
876c9d3a | 112 | |
aa21c004 DW |
113 | priv->SNR[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->snr; |
114 | priv->NF[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->nf; | |
10078321 | 115 | lbs_save_rawSNRNF(priv, p_rx_pd); |
876c9d3a | 116 | |
aa21c004 DW |
117 | priv->SNR[TYPE_RXPD][TYPE_AVG] = lbs_getavgsnr(priv) * AVG_SCALE; |
118 | priv->NF[TYPE_RXPD][TYPE_AVG] = lbs_getavgnf(priv) * AVG_SCALE; | |
9012b28a | 119 | lbs_deb_rx("after computing SNR: SNR-avg = %d, NF-avg = %d\n", |
aa21c004 DW |
120 | priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE, |
121 | priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE); | |
876c9d3a | 122 | |
aa21c004 DW |
123 | priv->RSSI[TYPE_RXPD][TYPE_NOAVG] = |
124 | CAL_RSSI(priv->SNR[TYPE_RXPD][TYPE_NOAVG], | |
125 | priv->NF[TYPE_RXPD][TYPE_NOAVG]); | |
876c9d3a | 126 | |
aa21c004 DW |
127 | priv->RSSI[TYPE_RXPD][TYPE_AVG] = |
128 | CAL_RSSI(priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE, | |
129 | priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE); | |
876c9d3a | 130 | |
9012b28a | 131 | lbs_deb_leave(LBS_DEB_RX); |
876c9d3a MT |
132 | } |
133 | ||
876c9d3a MT |
134 | /** |
135 | * @brief This function processes received packet and forwards it | |
136 | * to kernel/upper layer | |
137 | * | |
69f9032d | 138 | * @param priv A pointer to struct lbs_private |
876c9d3a MT |
139 | * @param skb A pointer to skb which includes the received packet |
140 | * @return 0 or -1 | |
141 | */ | |
69f9032d | 142 | int lbs_process_rxed_packet(struct lbs_private *priv, struct sk_buff *skb) |
876c9d3a | 143 | { |
876c9d3a | 144 | int ret = 0; |
6f93a8e7 | 145 | struct net_device *dev = priv->dev; |
876c9d3a MT |
146 | struct rxpackethdr *p_rx_pkt; |
147 | struct rxpd *p_rx_pd; | |
876c9d3a MT |
148 | int hdrchop; |
149 | struct ethhdr *p_ethhdr; | |
876c9d3a MT |
150 | const u8 rfc1042_eth_hdr[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; |
151 | ||
9012b28a | 152 | lbs_deb_enter(LBS_DEB_RX); |
876c9d3a | 153 | |
7919b89c HS |
154 | BUG_ON(!skb); |
155 | ||
6f93a8e7 DW |
156 | skb->ip_summed = CHECKSUM_NONE; |
157 | ||
c2b310a7 | 158 | if (priv->monitormode) |
876c9d3a MT |
159 | return process_rxed_802_11_packet(priv, skb); |
160 | ||
161 | p_rx_pkt = (struct rxpackethdr *) skb->data; | |
162 | p_rx_pd = &p_rx_pkt->rx_pd; | |
6f93a8e7 DW |
163 | if (priv->mesh_dev && (p_rx_pd->rx_control & RxPD_MESH_FRAME)) |
164 | dev = priv->mesh_dev; | |
876c9d3a | 165 | |
ece56191 | 166 | lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, |
876c9d3a MT |
167 | min_t(unsigned int, skb->len, 100)); |
168 | ||
169 | if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) { | |
9012b28a | 170 | lbs_deb_rx("rx err: frame received with bad length\n"); |
876c9d3a MT |
171 | priv->stats.rx_length_errors++; |
172 | ret = 0; | |
173 | goto done; | |
174 | } | |
175 | ||
176 | /* | |
177 | * Check rxpd status and update 802.3 stat, | |
178 | */ | |
981f187b | 179 | if (!(p_rx_pd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK))) { |
9012b28a HS |
180 | lbs_deb_rx("rx err: frame received with bad status\n"); |
181 | lbs_pr_alert("rxpd not ok\n"); | |
876c9d3a MT |
182 | priv->stats.rx_errors++; |
183 | ret = 0; | |
184 | goto done; | |
185 | } | |
186 | ||
9012b28a | 187 | lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n", |
876c9d3a MT |
188 | skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd)); |
189 | ||
ece56191 | 190 | lbs_deb_hex(LBS_DEB_RX, "RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr, |
876c9d3a | 191 | sizeof(p_rx_pkt->eth803_hdr.dest_addr)); |
ece56191 | 192 | lbs_deb_hex(LBS_DEB_RX, "RX Data: Src", p_rx_pkt->eth803_hdr.src_addr, |
876c9d3a MT |
193 | sizeof(p_rx_pkt->eth803_hdr.src_addr)); |
194 | ||
195 | if (memcmp(&p_rx_pkt->rfc1042_hdr, | |
196 | rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) { | |
197 | /* | |
198 | * Replace the 803 header and rfc1042 header (llc/snap) with an | |
199 | * EthernetII header, keep the src/dst and snap_type (ethertype) | |
200 | * | |
201 | * The firmware only passes up SNAP frames converting | |
202 | * all RX Data from 802.11 to 802.2/LLC/SNAP frames. | |
203 | * | |
204 | * To create the Ethernet II, just move the src, dst address right | |
205 | * before the snap_type. | |
206 | */ | |
207 | p_ethhdr = (struct ethhdr *) | |
208 | ((u8 *) & p_rx_pkt->eth803_hdr | |
209 | + sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr) | |
210 | - sizeof(p_rx_pkt->eth803_hdr.dest_addr) | |
211 | - sizeof(p_rx_pkt->eth803_hdr.src_addr) | |
212 | - sizeof(p_rx_pkt->rfc1042_hdr.snap_type)); | |
213 | ||
214 | memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr, | |
215 | sizeof(p_ethhdr->h_source)); | |
216 | memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr, | |
217 | sizeof(p_ethhdr->h_dest)); | |
218 | ||
219 | /* Chop off the rxpd + the excess memory from the 802.2/llc/snap header | |
220 | * that was removed | |
221 | */ | |
222 | hdrchop = (u8 *) p_ethhdr - (u8 *) p_rx_pkt; | |
223 | } else { | |
ece56191 | 224 | lbs_deb_hex(LBS_DEB_RX, "RX Data: LLC/SNAP", |
876c9d3a MT |
225 | (u8 *) & p_rx_pkt->rfc1042_hdr, |
226 | sizeof(p_rx_pkt->rfc1042_hdr)); | |
227 | ||
228 | /* Chop off the rxpd */ | |
229 | hdrchop = (u8 *) & p_rx_pkt->eth803_hdr - (u8 *) p_rx_pkt; | |
230 | } | |
231 | ||
232 | /* Chop off the leading header bytes so the skb points to the start of | |
233 | * either the reconstructed EthII frame or the 802.2/llc/snap frame | |
234 | */ | |
235 | skb_pull(skb, hdrchop); | |
236 | ||
237 | /* Take the data rate from the rxpd structure | |
238 | * only if the rate is auto | |
239 | */ | |
85319f93 | 240 | if (priv->enablehwauto) |
aa21c004 | 241 | priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate); |
876c9d3a | 242 | |
10078321 | 243 | lbs_compute_rssi(priv, p_rx_pd); |
876c9d3a | 244 | |
9012b28a | 245 | lbs_deb_rx("rx data: size of actual packet %d\n", skb->len); |
876c9d3a MT |
246 | priv->stats.rx_bytes += skb->len; |
247 | priv->stats.rx_packets++; | |
248 | ||
6f93a8e7 | 249 | skb->protocol = eth_type_trans(skb, dev); |
ae3e0fcf HS |
250 | if (in_interrupt()) |
251 | netif_rx(skb); | |
252 | else | |
253 | netif_rx_ni(skb); | |
3d4bd24b | 254 | |
876c9d3a MT |
255 | ret = 0; |
256 | done: | |
9012b28a | 257 | lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret); |
876c9d3a MT |
258 | return ret; |
259 | } | |
10078321 | 260 | EXPORT_SYMBOL_GPL(lbs_process_rxed_packet); |
876c9d3a MT |
261 | |
262 | /** | |
263 | * @brief This function converts Tx/Rx rates from the Marvell WLAN format | |
264 | * (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s) | |
265 | * | |
266 | * @param rate Input rate | |
267 | * @return Output Rate (0 if invalid) | |
268 | */ | |
269 | static u8 convert_mv_rate_to_radiotap(u8 rate) | |
270 | { | |
271 | switch (rate) { | |
272 | case 0: /* 1 Mbps */ | |
273 | return 2; | |
274 | case 1: /* 2 Mbps */ | |
275 | return 4; | |
276 | case 2: /* 5.5 Mbps */ | |
277 | return 11; | |
278 | case 3: /* 11 Mbps */ | |
279 | return 22; | |
965f8bbc LCC |
280 | /* case 4: reserved */ |
281 | case 5: /* 6 Mbps */ | |
876c9d3a | 282 | return 12; |
965f8bbc | 283 | case 6: /* 9 Mbps */ |
876c9d3a | 284 | return 18; |
965f8bbc | 285 | case 7: /* 12 Mbps */ |
876c9d3a | 286 | return 24; |
965f8bbc | 287 | case 8: /* 18 Mbps */ |
876c9d3a | 288 | return 36; |
965f8bbc | 289 | case 9: /* 24 Mbps */ |
876c9d3a | 290 | return 48; |
965f8bbc | 291 | case 10: /* 36 Mbps */ |
876c9d3a | 292 | return 72; |
965f8bbc | 293 | case 11: /* 48 Mbps */ |
876c9d3a | 294 | return 96; |
965f8bbc | 295 | case 12: /* 54 Mbps */ |
876c9d3a MT |
296 | return 108; |
297 | } | |
9012b28a | 298 | lbs_pr_alert("Invalid Marvell WLAN rate %i\n", rate); |
876c9d3a MT |
299 | return 0; |
300 | } | |
301 | ||
302 | /** | |
303 | * @brief This function processes a received 802.11 packet and forwards it | |
304 | * to kernel/upper layer | |
305 | * | |
69f9032d | 306 | * @param priv A pointer to struct lbs_private |
876c9d3a MT |
307 | * @param skb A pointer to skb which includes the received packet |
308 | * @return 0 or -1 | |
309 | */ | |
69f9032d HS |
310 | static int process_rxed_802_11_packet(struct lbs_private *priv, |
311 | struct sk_buff *skb) | |
876c9d3a | 312 | { |
876c9d3a MT |
313 | int ret = 0; |
314 | ||
315 | struct rx80211packethdr *p_rx_pkt; | |
316 | struct rxpd *prxpd; | |
317 | struct rx_radiotap_hdr radiotap_hdr; | |
318 | struct rx_radiotap_hdr *pradiotap_hdr; | |
319 | ||
9012b28a | 320 | lbs_deb_enter(LBS_DEB_RX); |
876c9d3a MT |
321 | |
322 | p_rx_pkt = (struct rx80211packethdr *) skb->data; | |
323 | prxpd = &p_rx_pkt->rx_pd; | |
324 | ||
ece56191 | 325 | // lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, min(skb->len, 100)); |
876c9d3a MT |
326 | |
327 | if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) { | |
7bf02c29 | 328 | lbs_deb_rx("rx err: frame received with bad length\n"); |
876c9d3a | 329 | priv->stats.rx_length_errors++; |
7bf02c29 DW |
330 | ret = -EINVAL; |
331 | kfree(skb); | |
876c9d3a MT |
332 | goto done; |
333 | } | |
334 | ||
335 | /* | |
336 | * Check rxpd status and update 802.3 stat, | |
337 | */ | |
981f187b | 338 | if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK))) { |
9012b28a | 339 | //lbs_deb_rx("rx err: frame received with bad status\n"); |
876c9d3a MT |
340 | priv->stats.rx_errors++; |
341 | } | |
342 | ||
9012b28a | 343 | lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n", |
876c9d3a MT |
344 | skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd)); |
345 | ||
346 | /* create the exported radio header */ | |
876c9d3a | 347 | |
180be755 DW |
348 | /* radiotap header */ |
349 | radiotap_hdr.hdr.it_version = 0; | |
350 | /* XXX must check this value for pad */ | |
351 | radiotap_hdr.hdr.it_pad = 0; | |
352 | radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr)); | |
353 | radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT); | |
354 | /* unknown values */ | |
355 | radiotap_hdr.flags = 0; | |
356 | radiotap_hdr.chan_freq = 0; | |
357 | radiotap_hdr.chan_flags = 0; | |
358 | radiotap_hdr.antenna = 0; | |
359 | /* known values */ | |
360 | radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate); | |
361 | /* XXX must check no carryout */ | |
362 | radiotap_hdr.antsignal = prxpd->snr + prxpd->nf; | |
363 | radiotap_hdr.rx_flags = 0; | |
364 | if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK))) | |
365 | radiotap_hdr.rx_flags |= IEEE80211_RADIOTAP_F_RX_BADFCS; | |
366 | //memset(radiotap_hdr.pad, 0x11, IEEE80211_RADIOTAP_HDRLEN - 18); | |
367 | ||
368 | /* chop the rxpd */ | |
369 | skb_pull(skb, sizeof(struct rxpd)); | |
370 | ||
371 | /* add space for the new radio header */ | |
372 | if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) && | |
7bf02c29 DW |
373 | pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0, GFP_ATOMIC)) { |
374 | lbs_pr_alert("%s: couldn't pskb_expand_head\n", __func__); | |
375 | ret = -ENOMEM; | |
376 | kfree_skb(skb); | |
377 | goto done; | |
876c9d3a MT |
378 | } |
379 | ||
180be755 DW |
380 | pradiotap_hdr = (void *)skb_push(skb, sizeof(struct rx_radiotap_hdr)); |
381 | memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr)); | |
382 | ||
876c9d3a MT |
383 | /* Take the data rate from the rxpd structure |
384 | * only if the rate is auto | |
385 | */ | |
85319f93 | 386 | if (priv->enablehwauto) |
aa21c004 | 387 | priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate); |
876c9d3a | 388 | |
10078321 | 389 | lbs_compute_rssi(priv, prxpd); |
876c9d3a | 390 | |
9012b28a | 391 | lbs_deb_rx("rx data: size of actual packet %d\n", skb->len); |
876c9d3a MT |
392 | priv->stats.rx_bytes += skb->len; |
393 | priv->stats.rx_packets++; | |
394 | ||
6f93a8e7 DW |
395 | skb->protocol = eth_type_trans(skb, priv->rtap_net_dev); |
396 | netif_rx(skb); | |
3d4bd24b | 397 | |
876c9d3a | 398 | ret = 0; |
876c9d3a | 399 | |
9012b28a | 400 | done: |
9012b28a HS |
401 | lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret); |
402 | return ret; | |
876c9d3a | 403 | } |