1 /*
2 * Copyright (c) 2012-2017, 2019 The Linux Foundation. All rights reserved.
3 *
4 * Permission to use, copy, modify, and/or distribute this software for
5 * any purpose with or without fee is hereby granted, provided that the
6 * above copyright notice and this permission notice appear in all
7 * copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
10 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
11 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
12 * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
13 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
14 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
15 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
16 * PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 /**
20 * @file ol_txrx_encap.c
21 * @brief Provide functions to encap/decap on txrx frames.
22 * @details
23 * This file contains functions for data frame encap/decap:
24 * ol_tx_encap: encap outgoing data frames.
25 * ol_rx_decap: decap incoming data frames.
26 */
27 #ifdef QCA_SUPPORT_SW_TXRX_ENCAP
28
29 #include <qdf_nbuf.h> /* qdf_nbuf_t, etc. */
30 #include <cds_ieee80211_common.h> /* ieee80211_frame */
31 #include <ol_txrx_internal.h> /* TXRX_ASSERT1 */
32 #include <ol_txrx_encap.h> /* struct ol_rx_decap_info_t */
33
34 static inline A_STATUS
ol_tx_copy_native_wifi_header(qdf_nbuf_t msdu,uint8_t * hdsize,uint8_t * localbuf)35 ol_tx_copy_native_wifi_header(qdf_nbuf_t msdu,
36 uint8_t *hdsize, uint8_t *localbuf)
37 {
38 struct ieee80211_frame *wh =
39 (struct ieee80211_frame *)qdf_nbuf_data(msdu);
40 if ((wh->i_fc[1] &
41 IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS) {
42 *hdsize = sizeof(struct ieee80211_frame_addr4);
43 } else {
44 *hdsize = sizeof(struct ieee80211_frame);
45 }
46 if (qdf_nbuf_len(msdu) < *hdsize)
47 return A_ERROR;
48
49 qdf_mem_copy(localbuf, wh, *hdsize);
50 return A_OK;
51 }
52
53 static inline A_STATUS
ol_tx_encap_from_native_wifi(struct ol_txrx_vdev_t * vdev,struct ol_tx_desc_t * tx_desc,qdf_nbuf_t msdu,struct ol_txrx_msdu_info_t * tx_msdu_info)54 ol_tx_encap_from_native_wifi(struct ol_txrx_vdev_t *vdev,
55 struct ol_tx_desc_t *tx_desc,
56 qdf_nbuf_t msdu,
57 struct ol_txrx_msdu_info_t *tx_msdu_info)
58 {
59 uint8_t localbuf[sizeof(struct ieee80211_qosframe_htc_addr4)];
60 struct ieee80211_frame *wh;
61 uint8_t hdsize, new_hdsize;
62 struct ieee80211_qoscntl *qos_cntl;
63 struct ol_txrx_peer_t *peer;
64
65 if (tx_msdu_info->htt.info.frame_type != htt_frm_type_data)
66 return A_OK;
67
68 peer = tx_msdu_info->peer;
69 /*
70 * for unicast,the peer should not be NULL.
71 * for multicast, the peer is AP.
72 */
73 if (tx_msdu_info->htt.info.is_unicast && peer->qos_capable) {
74 if (A_OK !=
75 ol_tx_copy_native_wifi_header(msdu, &hdsize, localbuf))
76 return A_ERROR;
77 wh = (struct ieee80211_frame *)localbuf;
78
79 /*add qos cntl */
80 qos_cntl = (struct ieee80211_qoscntl *)(localbuf + hdsize);
81 qos_cntl->i_qos[0] =
82 tx_msdu_info->htt.info.ext_tid & IEEE80211_QOS_TID;
83
84 #ifdef NEVERDEFINED
85 if (wmmParam[ac].wmep_noackPolicy)
86 qos_cntl->i_qos[0] |= 1 << IEEE80211_QOS_ACKPOLICY_S;
87 #endif
88
89 qos_cntl->i_qos[1] = 0;
90 wh->i_fc[0] |= QDF_IEEE80211_FC0_SUBTYPE_QOS;
91 /* count for qos field */
92 new_hdsize =
93 hdsize + sizeof(struct ieee80211_qosframe) -
94 sizeof(struct ieee80211_frame);
95
96 /*add ht control field if needed */
97
98 /* copy new hd to bd */
99 qdf_mem_copy((void *)
100 htt_tx_desc_mpdu_header(tx_desc->htt_tx_desc,
101 new_hdsize), localbuf,
102 new_hdsize);
103 qdf_nbuf_pull_head(msdu, hdsize);
104 tx_msdu_info->htt.info.l3_hdr_offset = new_hdsize;
105 tx_desc->orig_l2_hdr_bytes = hdsize;
106 }
107 /* Set Protected Frame bit in MAC header */
108 if (vdev->pdev->sw_pf_proc_enable
109 && tx_msdu_info->htt.action.do_encrypt) {
110 if (tx_desc->orig_l2_hdr_bytes) {
111 wh = (struct ieee80211_frame *)
112 htt_tx_desc_mpdu_header(tx_desc->htt_tx_desc,
113 tx_msdu_info->htt.info.
114 l3_hdr_offset);
115 } else {
116 if (A_OK !=
117 ol_tx_copy_native_wifi_header(msdu, &hdsize,
118 localbuf))
119 return A_ERROR;
120 wh = (struct ieee80211_frame *)
121 htt_tx_desc_mpdu_header(tx_desc->htt_tx_desc,
122 hdsize);
123 qdf_mem_copy((void *)wh, localbuf, hdsize);
124 qdf_nbuf_pull_head(msdu, hdsize);
125 tx_msdu_info->htt.info.l3_hdr_offset = hdsize;
126 tx_desc->orig_l2_hdr_bytes = hdsize;
127 }
128 wh->i_fc[1] |= IEEE80211_FC1_WEP;
129 }
130 return A_OK;
131 }
132
133 static inline A_STATUS
ol_tx_encap_from_8023(struct ol_txrx_vdev_t * vdev,struct ol_tx_desc_t * tx_desc,qdf_nbuf_t msdu,struct ol_txrx_msdu_info_t * tx_msdu_info)134 ol_tx_encap_from_8023(struct ol_txrx_vdev_t *vdev,
135 struct ol_tx_desc_t *tx_desc,
136 qdf_nbuf_t msdu, struct ol_txrx_msdu_info_t *tx_msdu_info)
137 {
138 uint8_t localbuf[sizeof(struct ieee80211_qosframe_htc_addr4)
139 + sizeof(struct llc_snap_hdr_t)];
140 struct llc_snap_hdr_t *llc_hdr;
141 struct ethernet_hdr_t *eth_hdr;
142 struct ieee80211_frame *wh;
143 uint8_t hdsize, new_l2_hdsize, new_hdsize;
144 struct ieee80211_qoscntl *qos_cntl;
145 const uint8_t ethernet_II_llc_snap_header_prefix[] = {
146 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
147 struct ol_txrx_peer_t *peer;
148 uint16_t ether_type;
149
150 if (tx_msdu_info->htt.info.frame_type != htt_frm_type_data)
151 return A_OK;
152
153 /*
154 * for unicast,the peer should not be NULL.
155 * for multicast, the peer is AP.
156 */
157 peer = tx_msdu_info->peer;
158
159 eth_hdr = (struct ethernet_hdr_t *)qdf_nbuf_data(msdu);
160 hdsize = sizeof(struct ethernet_hdr_t);
161 wh = (struct ieee80211_frame *)localbuf;
162 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA;
163 *(uint16_t *) wh->i_dur = 0;
164 new_hdsize = 0;
165
166 switch (vdev->opmode) {
167 case wlan_op_mode_ap:
168 /* DA , BSSID , SA */
169 qdf_mem_copy(wh->i_addr1, eth_hdr->dest_addr,
170 QDF_MAC_ADDR_SIZE);
171 qdf_mem_copy(wh->i_addr2, &vdev->mac_addr.raw,
172 QDF_MAC_ADDR_SIZE);
173 qdf_mem_copy(wh->i_addr3, eth_hdr->src_addr,
174 QDF_MAC_ADDR_SIZE);
175 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
176 new_hdsize = sizeof(struct ieee80211_frame);
177 break;
178 case wlan_op_mode_ibss:
179 /* DA, SA, BSSID */
180 qdf_mem_copy(wh->i_addr1, eth_hdr->dest_addr,
181 QDF_MAC_ADDR_SIZE);
182 qdf_mem_copy(wh->i_addr2, eth_hdr->src_addr,
183 QDF_MAC_ADDR_SIZE);
184 /* need to check the bssid behaviour for IBSS vdev */
185 qdf_mem_copy(wh->i_addr3, &vdev->mac_addr.raw,
186 QDF_MAC_ADDR_SIZE);
187 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
188 new_hdsize = sizeof(struct ieee80211_frame);
189 break;
190 case wlan_op_mode_sta:
191 /* BSSID, SA , DA */
192 qdf_mem_copy(wh->i_addr1, &peer->mac_addr.raw,
193 QDF_MAC_ADDR_SIZE);
194 qdf_mem_copy(wh->i_addr2, eth_hdr->src_addr,
195 QDF_MAC_ADDR_SIZE);
196 qdf_mem_copy(wh->i_addr3, eth_hdr->dest_addr,
197 QDF_MAC_ADDR_SIZE);
198 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
199 new_hdsize = sizeof(struct ieee80211_frame);
200 break;
201 case wlan_op_mode_monitor:
202 default:
203 return A_ERROR;
204 }
205 /*add qos cntl */
206 if (tx_msdu_info->htt.info.is_unicast && peer->qos_capable) {
207 qos_cntl = (struct ieee80211_qoscntl *)(localbuf + new_hdsize);
208 qos_cntl->i_qos[0] =
209 tx_msdu_info->htt.info.ext_tid & IEEE80211_QOS_TID;
210 wh->i_fc[0] |= QDF_IEEE80211_FC0_SUBTYPE_QOS;
211 #ifdef NEVERDEFINED
212 if (wmmParam[ac].wmep_noackPolicy)
213 qos_cntl->i_qos[0] |= 1 << IEEE80211_QOS_ACKPOLICY_S;
214 #endif
215 qos_cntl->i_qos[1] = 0;
216 new_hdsize += sizeof(struct ieee80211_qoscntl);
217
218 /*add ht control field if needed */
219 }
220 /* Set Protected Frame bit in MAC header */
221 if (vdev->pdev->sw_pf_proc_enable
222 && tx_msdu_info->htt.action.do_encrypt) {
223 wh->i_fc[1] |= IEEE80211_FC1_WEP;
224 }
225 new_l2_hdsize = new_hdsize;
226 /* add llc snap if needed */
227 if (vdev->pdev->sw_tx_llc_proc_enable) {
228 llc_hdr = (struct llc_snap_hdr_t *)(localbuf + new_hdsize);
229 ether_type =
230 (eth_hdr->ethertype[0] << 8) | (eth_hdr->ethertype[1]);
231 if (ether_type >= ETH_P_802_3_MIN) {
232 qdf_mem_copy(llc_hdr,
233 ethernet_II_llc_snap_header_prefix,
234 sizeof
235 (ethernet_II_llc_snap_header_prefix));
236 if (ether_type == ETHERTYPE_AARP
237 || ether_type == ETHERTYPE_IPX) {
238 llc_hdr->org_code[2] = BTEP_SNAP_ORGCODE_2;
239 /* 0xf8; bridge tunnel header */
240 }
241 llc_hdr->ethertype[0] = eth_hdr->ethertype[0];
242 llc_hdr->ethertype[1] = eth_hdr->ethertype[1];
243 new_hdsize += sizeof(struct llc_snap_hdr_t);
244 } else {
245 /*
246 * llc ready, and it's in payload pdu,
247 * do we need to move to BD pdu?
248 */
249 }
250 }
251 qdf_mem_copy((void *)
252 htt_tx_desc_mpdu_header(tx_desc->htt_tx_desc,
253 new_l2_hdsize), localbuf,
254 new_hdsize);
255 qdf_nbuf_pull_head(msdu, hdsize);
256 tx_msdu_info->htt.info.l3_hdr_offset = new_l2_hdsize;
257 tx_desc->orig_l2_hdr_bytes = hdsize;
258 return A_OK;
259 }
260
261 A_STATUS
ol_tx_encap(struct ol_txrx_vdev_t * vdev,struct ol_tx_desc_t * tx_desc,qdf_nbuf_t msdu,struct ol_txrx_msdu_info_t * msdu_info)262 ol_tx_encap(struct ol_txrx_vdev_t *vdev,
263 struct ol_tx_desc_t *tx_desc,
264 qdf_nbuf_t msdu, struct ol_txrx_msdu_info_t *msdu_info)
265 {
266 struct ol_txrx_pdev_t *pdev = vdev->pdev;
267
268 if (pdev->frame_format == wlan_frm_fmt_native_wifi) {
269 return ol_tx_encap_from_native_wifi(vdev, tx_desc, msdu,
270 msdu_info);
271 } else if (pdev->frame_format == wlan_frm_fmt_802_3) {
272 return ol_tx_encap_from_8023(vdev, tx_desc, msdu, msdu_info);
273 }
274
275 /* todo for other types */
276 return A_ERROR;
277 }
278
279 static inline void
ol_rx_decap_to_native_wifi(struct ol_txrx_vdev_t * vdev,qdf_nbuf_t msdu,struct ol_rx_decap_info_t * info,struct ethernet_hdr_t * ethr_hdr)280 ol_rx_decap_to_native_wifi(struct ol_txrx_vdev_t *vdev,
281 qdf_nbuf_t msdu,
282 struct ol_rx_decap_info_t *info,
283 struct ethernet_hdr_t *ethr_hdr)
284 {
285 struct ieee80211_frame_addr4 *wh;
286 uint16_t hdsize;
287
288 /*
289 * we need to remove Qos control field and HT control.
290 * MSFT: http://msdn.microsoft.com/en-us/library/windows/
291 * hardware/ff552608(v=vs.85).aspx
292 */
293 wh = (struct ieee80211_frame_addr4 *)info->hdr;
294 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) ==
295 IEEE80211_FC1_DIR_DSTODS)
296 hdsize = sizeof(struct ieee80211_frame_addr4);
297 else
298 hdsize = sizeof(struct ieee80211_frame);
299
300 wh = (struct ieee80211_frame_addr4 *)qdf_nbuf_push_head(msdu, hdsize);
301 TXRX_ASSERT2(wh);
302 TXRX_ASSERT2(hdsize <= info->hdr_len);
303 qdf_mem_copy((uint8_t *) wh, info->hdr, hdsize);
304
305 /* amsdu subfrm handling if ethr_hdr is not NULL */
306 if (ethr_hdr) {
307 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
308 case IEEE80211_FC1_DIR_NODS:
309 qdf_mem_copy(wh->i_addr1, ethr_hdr->dest_addr,
310 QDF_MAC_ADDR_SIZE);
311 qdf_mem_copy(wh->i_addr2, ethr_hdr->src_addr,
312 QDF_MAC_ADDR_SIZE);
313 break;
314 case IEEE80211_FC1_DIR_TODS:
315 qdf_mem_copy(wh->i_addr2, ethr_hdr->src_addr,
316 QDF_MAC_ADDR_SIZE);
317 qdf_mem_copy(wh->i_addr3, ethr_hdr->dest_addr,
318 QDF_MAC_ADDR_SIZE);
319 break;
320 case IEEE80211_FC1_DIR_FROMDS:
321 qdf_mem_copy(wh->i_addr1, ethr_hdr->dest_addr,
322 QDF_MAC_ADDR_SIZE);
323 qdf_mem_copy(wh->i_addr3, ethr_hdr->src_addr,
324 QDF_MAC_ADDR_SIZE);
325 break;
326 case IEEE80211_FC1_DIR_DSTODS:
327 qdf_mem_copy(wh->i_addr3, ethr_hdr->dest_addr,
328 QDF_MAC_ADDR_SIZE);
329 qdf_mem_copy(wh->i_addr4, ethr_hdr->src_addr,
330 QDF_MAC_ADDR_SIZE);
331 break;
332 }
333 }
334 if (IEEE80211_QOS_HAS_SEQ(wh)) {
335 if (wh->i_fc[1] & IEEE80211_FC1_ORDER)
336 wh->i_fc[1] &= ~IEEE80211_FC1_ORDER;
337 wh->i_fc[0] &= ~QDF_IEEE80211_FC0_SUBTYPE_QOS;
338 }
339 }
340
341 static inline void
ol_rx_decap_to_8023(struct ol_txrx_vdev_t * vdev,qdf_nbuf_t msdu,struct ol_rx_decap_info_t * info,struct ethernet_hdr_t * ethr_hdr)342 ol_rx_decap_to_8023(struct ol_txrx_vdev_t *vdev,
343 qdf_nbuf_t msdu,
344 struct ol_rx_decap_info_t *info,
345 struct ethernet_hdr_t *ethr_hdr)
346 {
347 struct llc_snap_hdr_t *llc_hdr;
348 uint16_t ether_type;
349 uint16_t l2_hdr_space;
350 struct ieee80211_frame_addr4 *wh;
351 uint8_t local_buf[ETHERNET_HDR_LEN];
352 uint8_t *buf;
353
354 /*
355 * populate Ethernet header,
356 * if ethr_hdr is null, rx frame is 802.11 format(HW ft disabled)
357 * if ethr_hdr is not null, rx frame is "subfrm of amsdu".
358 */
359 buf = (uint8_t *) qdf_nbuf_data(msdu);
360 llc_hdr = (struct llc_snap_hdr_t *)buf;
361 ether_type = (llc_hdr->ethertype[0] << 8) | llc_hdr->ethertype[1];
362 /* do llc remove if needed */
363 l2_hdr_space = 0;
364 if (IS_SNAP(llc_hdr)) {
365 if (IS_BTEP(llc_hdr)) {
366 /* remove llc */
367 l2_hdr_space += sizeof(struct llc_snap_hdr_t);
368 llc_hdr = NULL;
369 } else if (IS_RFC1042(llc_hdr)) {
370 if (!(ether_type == ETHERTYPE_AARP ||
371 ether_type == ETHERTYPE_IPX)) {
372 /* remove llc */
373 l2_hdr_space += sizeof(struct llc_snap_hdr_t);
374 llc_hdr = NULL;
375 }
376 }
377 }
378 if (l2_hdr_space > ETHERNET_HDR_LEN)
379 buf = qdf_nbuf_pull_head(msdu, l2_hdr_space - ETHERNET_HDR_LEN);
380 else if (l2_hdr_space < ETHERNET_HDR_LEN)
381 buf = qdf_nbuf_push_head(msdu, ETHERNET_HDR_LEN - l2_hdr_space);
382
383 /* normal msdu(non-subfrm of A-MSDU) if ethr_hdr is null */
384 if (!ethr_hdr) {
385 /*
386 * mpdu hdr should be present in info,
387 * re-create ethr_hdr based on mpdu hdr
388 */
389 TXRX_ASSERT2(info->hdr_len != 0);
390 wh = (struct ieee80211_frame_addr4 *)info->hdr;
391 ethr_hdr = (struct ethernet_hdr_t *)local_buf;
392 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
393 case IEEE80211_FC1_DIR_NODS:
394 qdf_mem_copy(ethr_hdr->dest_addr, wh->i_addr1,
395 QDF_MAC_ADDR_SIZE);
396 qdf_mem_copy(ethr_hdr->src_addr, wh->i_addr2,
397 QDF_MAC_ADDR_SIZE);
398 break;
399 case IEEE80211_FC1_DIR_TODS:
400 qdf_mem_copy(ethr_hdr->dest_addr, wh->i_addr3,
401 QDF_MAC_ADDR_SIZE);
402 qdf_mem_copy(ethr_hdr->src_addr, wh->i_addr2,
403 QDF_MAC_ADDR_SIZE);
404 break;
405 case IEEE80211_FC1_DIR_FROMDS:
406 qdf_mem_copy(ethr_hdr->dest_addr, wh->i_addr1,
407 QDF_MAC_ADDR_SIZE);
408 qdf_mem_copy(ethr_hdr->src_addr, wh->i_addr3,
409 QDF_MAC_ADDR_SIZE);
410 break;
411 case IEEE80211_FC1_DIR_DSTODS:
412 qdf_mem_copy(ethr_hdr->dest_addr, wh->i_addr3,
413 QDF_MAC_ADDR_SIZE);
414 qdf_mem_copy(ethr_hdr->src_addr, wh->i_addr4,
415 QDF_MAC_ADDR_SIZE);
416 break;
417 }
418 }
419 if (!llc_hdr) {
420 ethr_hdr->ethertype[0] = (ether_type >> 8) & 0xff;
421 ethr_hdr->ethertype[1] = (ether_type) & 0xff;
422 } else {
423 uint32_t pktlen =
424 qdf_nbuf_len(msdu) - sizeof(ethr_hdr->ethertype);
425 TXRX_ASSERT2(pktlen <= ETHERNET_MTU);
426 ether_type = (uint16_t) pktlen;
427 ether_type = qdf_nbuf_len(msdu) - sizeof(struct ethernet_hdr_t);
428 ethr_hdr->ethertype[0] = (ether_type >> 8) & 0xff;
429 ethr_hdr->ethertype[1] = (ether_type) & 0xff;
430 }
431 qdf_mem_copy(buf, ethr_hdr, ETHERNET_HDR_LEN);
432 }
433
434 static inline A_STATUS
ol_rx_decap_subfrm_amsdu(struct ol_txrx_vdev_t * vdev,qdf_nbuf_t msdu,struct ol_rx_decap_info_t * info)435 ol_rx_decap_subfrm_amsdu(struct ol_txrx_vdev_t *vdev,
436 qdf_nbuf_t msdu, struct ol_rx_decap_info_t *info)
437 {
438 struct ol_txrx_pdev_t *pdev = vdev->pdev;
439 uint8_t *subfrm_hdr;
440 uint8_t localbuf[ETHERNET_HDR_LEN];
441 struct ethernet_hdr_t *ether_hdr = (struct ethernet_hdr_t *)localbuf;
442
443 subfrm_hdr = (uint8_t *) qdf_nbuf_data(msdu);
444 if (pdev->frame_format == wlan_frm_fmt_native_wifi) {
445 /* decap to native wifi */
446 qdf_mem_copy(ether_hdr, subfrm_hdr, ETHERNET_HDR_LEN);
447 qdf_nbuf_pull_head(msdu, ETHERNET_HDR_LEN);
448 ol_rx_decap_to_native_wifi(vdev, msdu, info, ether_hdr);
449 } else if (pdev->frame_format == wlan_frm_fmt_802_3) {
450 if (pdev->sw_rx_llc_proc_enable) {
451 /* remove llc snap hdr if it's necessary according to
452 * 802.11 table P-3
453 */
454 qdf_mem_copy(ether_hdr, subfrm_hdr, ETHERNET_HDR_LEN);
455 qdf_nbuf_pull_head(msdu, ETHERNET_HDR_LEN);
456 ol_rx_decap_to_8023(vdev, msdu, info, ether_hdr);
457 } else {
458 /* subfrm of A-MSDU is already in 802.3 format.
459 * if target HW or FW has done LLC rmv process,
460 * we do nothing here.
461 */
462 }
463 } else {
464 /* todo for othertype */
465 }
466 return A_OK;
467
468 }
469
470 static inline A_STATUS
ol_rx_decap_msdu(struct ol_txrx_vdev_t * vdev,qdf_nbuf_t msdu,struct ol_rx_decap_info_t * info)471 ol_rx_decap_msdu(struct ol_txrx_vdev_t *vdev,
472 qdf_nbuf_t msdu, struct ol_rx_decap_info_t *info)
473 {
474 struct ol_txrx_pdev_t *pdev = vdev->pdev;
475 struct ieee80211_frame *wh;
476
477 wh = (struct ieee80211_frame *)qdf_nbuf_data(msdu);
478
479 if (pdev->frame_format == wlan_frm_fmt_native_wifi) {
480 /* Decap to native wifi because according to MSFT(
481 * MSFT: http://msdn.microsoft.com/en-us/library/windows/
482 * hardware/ff552608(v=vs.85).aspx),
483 * we need to remove Qos and HTC field before indicate to OS.
484 */
485 if (IEEE80211_QOS_HAS_SEQ(wh)) {
486 info->hdr_len = ol_txrx_ieee80211_hdrsize(wh);
487 TXRX_ASSERT2(info->hdr_len <= sizeof(info->hdr));
488 qdf_mem_copy(info->hdr, /* use info->hdr as temp buf. */
489 wh, info->hdr_len);
490 qdf_nbuf_pull_head(msdu, info->hdr_len);
491 ol_rx_decap_to_native_wifi(vdev, msdu, info, NULL);
492 /* 802.11 hdr^ eth_hdr^ */
493 }
494 } else if (pdev->frame_format == wlan_frm_fmt_802_3) {
495 if (pdev->sw_rx_llc_proc_enable) {
496 info->hdr_len = ol_txrx_ieee80211_hdrsize(wh);
497 TXRX_ASSERT2(info->hdr_len <= sizeof(info->hdr));
498 qdf_mem_copy(info->hdr, /* use info->hdr as temp buf. */
499 wh, info->hdr_len);
500 qdf_nbuf_pull_head(msdu, info->hdr_len);
501 /* remove llc snap hdr if it's necessary according to
502 * 802.11 table P-3
503 */
504 ol_rx_decap_to_8023(vdev, msdu, info, /* 802.11 hdr */
505 NULL); /* ethernet hdr */
506 } else {
507 /* Subfrm of A-MSDU is already in 802.3 format.
508 * And if target HW or FW has done LLC rmv process (
509 * sw_rx_lc_proc_enable == 0), we do nothing here.
510 */
511 }
512 } else {
513 /* todo for othertype */
514 }
515 return A_OK;
516
517 }
518
519 A_STATUS
ol_rx_decap(struct ol_txrx_vdev_t * vdev,struct ol_txrx_peer_t * peer,qdf_nbuf_t msdu,struct ol_rx_decap_info_t * info)520 ol_rx_decap(struct ol_txrx_vdev_t *vdev,
521 struct ol_txrx_peer_t *peer,
522 qdf_nbuf_t msdu, struct ol_rx_decap_info_t *info)
523 {
524 A_STATUS status;
525 uint8_t *mpdu_hdr;
526
527 if (!info->is_subfrm) {
528 if (info->is_msdu_cmpl_mpdu && !info->is_first_subfrm) {
529 /* It's normal MSDU. */
530 } else {
531 /*
532 * It's a first subfrm of A-MSDU and
533 * may also be the last subfrm of A-MSDU
534 */
535 info->is_subfrm = 1;
536 info->hdr_len = 0;
537 if (vdev->pdev->sw_subfrm_hdr_recovery_enable) {
538 /* we save the first subfrm mpdu hdr for
539 * subsequent subfrm 802.11 header recovery
540 * in certain chip(such as Riva).
541 */
542 mpdu_hdr = qdf_nbuf_data(msdu);
543 info->hdr_len =
544 ol_txrx_ieee80211_hdrsize(mpdu_hdr);
545 TXRX_ASSERT2(info->hdr_len <=
546 sizeof(info->hdr));
547 qdf_mem_copy(info->hdr, mpdu_hdr,
548 info->hdr_len);
549 qdf_nbuf_pull_head(msdu, info->hdr_len);
550 }
551 }
552 }
553
554 if (info->is_subfrm && vdev->pdev->sw_subfrm_hdr_recovery_enable) {
555 /*
556 * This case is enabled for some HWs (such as Riva). The HW
557 * de-aggregate doesn't have capability to generate 802.11
558 * header for non-first subframe of A-MSDU. That means sw needs
559 * to cache the first subfrm mpdu header to generate the
560 * subsequent subfrm's 802.11 header.
561 */
562 TXRX_ASSERT2(info->hdr_len != 0);
563 status = ol_rx_decap_subfrm_amsdu(vdev, msdu, info);
564 } else {
565 status = ol_rx_decap_msdu(vdev, msdu, info);
566 }
567
568 if (info->is_msdu_cmpl_mpdu)
569 info->is_subfrm = info->is_first_subfrm = info->hdr_len = 0;
570
571 return status;
572 }
573 #endif
574