1 /******************************************************************************
2 * rtl8712_recv.c
3 *
4 * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
5 * Linux device driver for RTL8192SU
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
19 *
20 * Modifications for inclusion into the Linux staging tree are
21 * Copyright(c) 2010 Larry Finger. All rights reserved.
22 *
23 * Contact information:
24 * WLAN FAE <wlanfae@realtek.com>
25 * Larry Finger <Larry.Finger@lwfinger.net>
26 *
27 ******************************************************************************/
28
29 #define _RTL8712_RECV_C_
30
31 #include "osdep_service.h"
32 #include "drv_types.h"
33 #include "recv_osdep.h"
34 #include "mlme_osdep.h"
35 #include "ip.h"
36 #include "if_ether.h"
37 #include "ethernet.h"
38 #include "usb_ops.h"
39 #include "wifi.h"
40
41 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
42 static u8 bridge_tunnel_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8};
43
44 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
45 static u8 rfc1042_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
46
47 static void recv_tasklet(void *priv);
48
r8712_init_recv_priv(struct recv_priv * precvpriv,struct _adapter * padapter)49 int r8712_init_recv_priv(struct recv_priv *precvpriv, struct _adapter *padapter)
50 {
51 int i;
52 struct recv_buf *precvbuf;
53 int res = _SUCCESS;
54 addr_t tmpaddr = 0;
55 int alignment = 0;
56 struct sk_buff *pskb = NULL;
57
58 /*init recv_buf*/
59 _init_queue(&precvpriv->free_recv_buf_queue);
60 precvpriv->pallocated_recv_buf = _malloc(NR_RECVBUFF *
61 sizeof(struct recv_buf) + 4);
62 if (precvpriv->pallocated_recv_buf == NULL)
63 return _FAIL;
64 memset(precvpriv->pallocated_recv_buf, 0, NR_RECVBUFF *
65 sizeof(struct recv_buf) + 4);
66 precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 -
67 ((addr_t) (precvpriv->pallocated_recv_buf) & 3);
68 precvbuf = (struct recv_buf *)precvpriv->precv_buf;
69 for (i = 0; i < NR_RECVBUFF; i++) {
70 _init_listhead(&precvbuf->list);
71 spin_lock_init(&precvbuf->recvbuf_lock);
72 res = r8712_os_recvbuf_resource_alloc(padapter, precvbuf);
73 if (res == _FAIL)
74 break;
75 precvbuf->ref_cnt = 0;
76 precvbuf->adapter = padapter;
77 list_insert_tail(&precvbuf->list,
78 &(precvpriv->free_recv_buf_queue.queue));
79 precvbuf++;
80 }
81 precvpriv->free_recv_buf_queue_cnt = NR_RECVBUFF;
82 tasklet_init(&precvpriv->recv_tasklet,
83 (void(*)(unsigned long))recv_tasklet,
84 (unsigned long)padapter);
85 skb_queue_head_init(&precvpriv->rx_skb_queue);
86
87 skb_queue_head_init(&precvpriv->free_recv_skb_queue);
88 for (i = 0; i < NR_PREALLOC_RECV_SKB; i++) {
89 pskb = netdev_alloc_skb(padapter->pnetdev, MAX_RECVBUF_SZ +
90 RECVBUFF_ALIGN_SZ);
91 if (pskb) {
92 pskb->dev = padapter->pnetdev;
93 tmpaddr = (addr_t)pskb->data;
94 alignment = tmpaddr & (RECVBUFF_ALIGN_SZ-1);
95 skb_reserve(pskb, (RECVBUFF_ALIGN_SZ - alignment));
96 skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
97 }
98 pskb = NULL;
99 }
100 return res;
101 }
102
r8712_free_recv_priv(struct recv_priv * precvpriv)103 void r8712_free_recv_priv(struct recv_priv *precvpriv)
104 {
105 int i;
106 struct recv_buf *precvbuf;
107 struct _adapter *padapter = precvpriv->adapter;
108
109 precvbuf = (struct recv_buf *)precvpriv->precv_buf;
110 for (i = 0; i < NR_RECVBUFF ; i++) {
111 r8712_os_recvbuf_resource_free(padapter, precvbuf);
112 precvbuf++;
113 }
114 kfree(precvpriv->pallocated_recv_buf);
115 skb_queue_purge(&precvpriv->rx_skb_queue);
116 if (skb_queue_len(&precvpriv->rx_skb_queue))
117 printk(KERN_WARNING "r8712u: rx_skb_queue not empty\n");
118 skb_queue_purge(&precvpriv->free_recv_skb_queue);
119 if (skb_queue_len(&precvpriv->free_recv_skb_queue))
120 printk(KERN_WARNING "r8712u: free_recv_skb_queue not empty "
121 "%d\n", skb_queue_len(&precvpriv->free_recv_skb_queue));
122 }
123
r8712_init_recvbuf(struct _adapter * padapter,struct recv_buf * precvbuf)124 int r8712_init_recvbuf(struct _adapter *padapter, struct recv_buf *precvbuf)
125 {
126 int res = _SUCCESS;
127
128 precvbuf->transfer_len = 0;
129 precvbuf->len = 0;
130 precvbuf->ref_cnt = 0;
131 if (precvbuf->pbuf) {
132 precvbuf->pdata = precvbuf->pbuf;
133 precvbuf->phead = precvbuf->pbuf;
134 precvbuf->ptail = precvbuf->pbuf;
135 precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ;
136 }
137 return res;
138 }
139
r8712_free_recvframe(union recv_frame * precvframe,struct __queue * pfree_recv_queue)140 int r8712_free_recvframe(union recv_frame *precvframe,
141 struct __queue *pfree_recv_queue)
142 {
143 unsigned long irqL;
144 struct _adapter *padapter = precvframe->u.hdr.adapter;
145 struct recv_priv *precvpriv = &padapter->recvpriv;
146
147 if (precvframe->u.hdr.pkt) {
148 dev_kfree_skb_any(precvframe->u.hdr.pkt);/*free skb by driver*/
149 precvframe->u.hdr.pkt = NULL;
150 }
151 spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
152 list_delete(&(precvframe->u.hdr.list));
153 list_insert_tail(&(precvframe->u.hdr.list),
154 get_list_head(pfree_recv_queue));
155 if (padapter != NULL) {
156 if (pfree_recv_queue == &precvpriv->free_recv_queue)
157 precvpriv->free_recvframe_cnt++;
158 }
159 spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
160 return _SUCCESS;
161 }
162
update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib * pattrib,struct recv_stat * prxstat)163 static void update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib *pattrib,
164 struct recv_stat *prxstat)
165 {
166 u32 *pphy_info;
167 struct phy_stat *pphy_stat;
168 u16 drvinfo_sz = 0;
169
170 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0)&0x000f0000)>>16;
171 drvinfo_sz = drvinfo_sz<<3;
172 /*TODO:
173 * Offset 0 */
174 pattrib->bdecrypted = ((le32_to_cpu(prxstat->rxdw0) & BIT(27)) >> 27)
175 ? 0 : 1;
176 pattrib->crc_err = ((le32_to_cpu(prxstat->rxdw0) & BIT(14)) >> 14);
177 /*Offset 4*/
178 /*Offset 8*/
179 /*Offset 12*/
180 if (le32_to_cpu(prxstat->rxdw3) & BIT(13)) {
181 pattrib->tcpchk_valid = 1; /* valid */
182 if (le32_to_cpu(prxstat->rxdw3) & BIT(11))
183 pattrib->tcp_chkrpt = 1; /* correct */
184 else
185 pattrib->tcp_chkrpt = 0; /* incorrect */
186 if (le32_to_cpu(prxstat->rxdw3) & BIT(12))
187 pattrib->ip_chkrpt = 1; /* correct */
188 else
189 pattrib->ip_chkrpt = 0; /* incorrect */
190 } else
191 pattrib->tcpchk_valid = 0; /* invalid */
192 pattrib->mcs_rate = (u8)((le32_to_cpu(prxstat->rxdw3)) & 0x3f);
193 pattrib->htc = (u8)((le32_to_cpu(prxstat->rxdw3) >> 14) & 0x1);
194 /*Offset 16*/
195 /*Offset 20*/
196 /*phy_info*/
197 if (drvinfo_sz) {
198 pphy_stat = (struct phy_stat *)(prxstat+1);
199 pphy_info = (u32 *)prxstat+1;
200 }
201 }
202
203 /*perform defrag*/
recvframe_defrag(struct _adapter * adapter,struct __queue * defrag_q)204 static union recv_frame *recvframe_defrag(struct _adapter *adapter,
205 struct __queue *defrag_q)
206 {
207 struct list_head *plist, *phead;
208 u8 *data, wlanhdr_offset;
209 u8 curfragnum;
210 struct recv_frame_hdr *pfhdr, *pnfhdr;
211 union recv_frame *prframe, *pnextrframe;
212 struct __queue *pfree_recv_queue;
213
214 pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
215 phead = get_list_head(defrag_q);
216 plist = get_next(phead);
217 prframe = LIST_CONTAINOR(plist, union recv_frame, u);
218 list_delete(&prframe->u.list);
219 pfhdr = &prframe->u.hdr;
220 curfragnum = 0;
221 if (curfragnum != pfhdr->attrib.frag_num) {
222 /*the first fragment number must be 0
223 *free the whole queue*/
224 r8712_free_recvframe(prframe, pfree_recv_queue);
225 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
226 return NULL;
227 }
228 curfragnum++;
229 plist = get_list_head(defrag_q);
230 plist = get_next(plist);
231 data = get_recvframe_data(prframe);
232 while (end_of_queue_search(phead, plist) == false) {
233 pnextrframe = LIST_CONTAINOR(plist, union recv_frame, u);
234 pnfhdr = &pnextrframe->u.hdr;
235 /*check the fragment sequence (2nd ~n fragment frame) */
236 if (curfragnum != pnfhdr->attrib.frag_num) {
237 /* the fragment number must increase (after decache)
238 * release the defrag_q & prframe */
239 r8712_free_recvframe(prframe, pfree_recv_queue);
240 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
241 return NULL;
242 }
243 curfragnum++;
244 /* copy the 2nd~n fragment frame's payload to the first fragment
245 * get the 2nd~last fragment frame's payload */
246 wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;
247 recvframe_pull(pnextrframe, wlanhdr_offset);
248 /* append to first fragment frame's tail (if privacy frame,
249 * pull the ICV) */
250 recvframe_pull_tail(prframe, pfhdr->attrib.icv_len);
251 memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len);
252 recvframe_put(prframe, pnfhdr->len);
253 pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
254 plist = get_next(plist);
255 }
256 /* free the defrag_q queue and return the prframe */
257 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
258 return prframe;
259 }
260
261 /* check if need to defrag, if needed queue the frame to defrag_q */
r8712_recvframe_chk_defrag(struct _adapter * padapter,union recv_frame * precv_frame)262 union recv_frame *r8712_recvframe_chk_defrag(struct _adapter *padapter,
263 union recv_frame *precv_frame)
264 {
265 u8 ismfrag;
266 u8 fragnum;
267 u8 *psta_addr;
268 struct recv_frame_hdr *pfhdr;
269 struct sta_info *psta;
270 struct sta_priv *pstapriv ;
271 struct list_head *phead;
272 union recv_frame *prtnframe = NULL;
273 struct __queue *pfree_recv_queue, *pdefrag_q;
274
275 pstapriv = &padapter->stapriv;
276 pfhdr = &precv_frame->u.hdr;
277 pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
278 /* need to define struct of wlan header frame ctrl */
279 ismfrag = pfhdr->attrib.mfrag;
280 fragnum = pfhdr->attrib.frag_num;
281 psta_addr = pfhdr->attrib.ta;
282 psta = r8712_get_stainfo(pstapriv, psta_addr);
283 if (psta == NULL)
284 pdefrag_q = NULL;
285 else
286 pdefrag_q = &psta->sta_recvpriv.defrag_q;
287
288 if ((ismfrag == 0) && (fragnum == 0))
289 prtnframe = precv_frame;/*isn't a fragment frame*/
290 if (ismfrag == 1) {
291 /* 0~(n-1) fragment frame
292 * enqueue to defraf_g */
293 if (pdefrag_q != NULL) {
294 if (fragnum == 0) {
295 /*the first fragment*/
296 if (_queue_empty(pdefrag_q) == false) {
297 /*free current defrag_q */
298 r8712_free_recvframe_queue(pdefrag_q,
299 pfree_recv_queue);
300 }
301 }
302 /* Then enqueue the 0~(n-1) fragment to the defrag_q */
303 phead = get_list_head(pdefrag_q);
304 list_insert_tail(&pfhdr->list, phead);
305 prtnframe = NULL;
306 } else {
307 /* can't find this ta's defrag_queue, so free this
308 * recv_frame */
309 r8712_free_recvframe(precv_frame, pfree_recv_queue);
310 prtnframe = NULL;
311 }
312
313 }
314 if ((ismfrag == 0) && (fragnum != 0)) {
315 /* the last fragment frame
316 * enqueue the last fragment */
317 if (pdefrag_q != NULL) {
318 phead = get_list_head(pdefrag_q);
319 list_insert_tail(&pfhdr->list, phead);
320 /*call recvframe_defrag to defrag*/
321 precv_frame = recvframe_defrag(padapter, pdefrag_q);
322 prtnframe = precv_frame;
323 } else {
324 /* can't find this ta's defrag_queue, so free this
325 * recv_frame */
326 r8712_free_recvframe(precv_frame, pfree_recv_queue);
327 prtnframe = NULL;
328 }
329 }
330 if ((prtnframe != NULL) && (prtnframe->u.hdr.attrib.privacy)) {
331 /* after defrag we must check tkip mic code */
332 if (r8712_recvframe_chkmic(padapter, prtnframe) == _FAIL) {
333 r8712_free_recvframe(prtnframe, pfree_recv_queue);
334 prtnframe = NULL;
335 }
336 }
337 return prtnframe;
338 }
339
amsdu_to_msdu(struct _adapter * padapter,union recv_frame * prframe)340 static int amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe)
341 {
342 int a_len, padding_len;
343 u16 eth_type, nSubframe_Length;
344 u8 nr_subframes, i;
345 unsigned char *data_ptr, *pdata;
346 struct rx_pkt_attrib *pattrib;
347 _pkt *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
348 struct recv_priv *precvpriv = &padapter->recvpriv;
349 struct __queue *pfree_recv_queue = &(precvpriv->free_recv_queue);
350 int ret = _SUCCESS;
351
352 nr_subframes = 0;
353 pattrib = &prframe->u.hdr.attrib;
354 recvframe_pull(prframe, prframe->u.hdr.attrib.hdrlen);
355 if (prframe->u.hdr.attrib.iv_len > 0)
356 recvframe_pull(prframe, prframe->u.hdr.attrib.iv_len);
357 a_len = prframe->u.hdr.len;
358 pdata = prframe->u.hdr.rx_data;
359 while (a_len > ETH_HLEN) {
360 /* Offset 12 denote 2 mac address */
361 nSubframe_Length = *((u16 *)(pdata + 12));
362 /*==m==>change the length order*/
363 nSubframe_Length = (nSubframe_Length >> 8) +
364 (nSubframe_Length << 8);
365 if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
366 printk(KERN_WARNING "r8712u: nRemain_Length is %d and"
367 " nSubframe_Length is: %d\n",
368 a_len, nSubframe_Length);
369 goto exit;
370 }
371 /* move the data point to data content */
372 pdata += ETH_HLEN;
373 a_len -= ETH_HLEN;
374 /* Allocate new skb for releasing to upper layer */
375 sub_skb = dev_alloc_skb(nSubframe_Length + 12);
376 skb_reserve(sub_skb, 12);
377 data_ptr = (u8 *)skb_put(sub_skb, nSubframe_Length);
378 memcpy(data_ptr, pdata, nSubframe_Length);
379 subframes[nr_subframes++] = sub_skb;
380 if (nr_subframes >= MAX_SUBFRAME_COUNT) {
381 printk(KERN_WARNING "r8712u: ParseSubframe(): Too"
382 " many Subframes! Packets dropped!\n");
383 break;
384 }
385 pdata += nSubframe_Length;
386 a_len -= nSubframe_Length;
387 if (a_len != 0) {
388 padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & 3);
389 if (padding_len == 4)
390 padding_len = 0;
391 if (a_len < padding_len)
392 goto exit;
393 pdata += padding_len;
394 a_len -= padding_len;
395 }
396 }
397 for (i = 0; i < nr_subframes; i++) {
398 sub_skb = subframes[i];
399 /* convert hdr + possible LLC headers into Ethernet header */
400 eth_type = (sub_skb->data[6] << 8) | sub_skb->data[7];
401 if (sub_skb->len >= 8 &&
402 ((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) &&
403 eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
404 !memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE))) {
405 /* remove RFC1042 or Bridge-Tunnel encapsulation and
406 * replace EtherType */
407 skb_pull(sub_skb, SNAP_SIZE);
408 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
409 ETH_ALEN);
410 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
411 ETH_ALEN);
412 } else {
413 u16 len;
414 /* Leave Ethernet header part of hdr and full payload */
415 len = htons(sub_skb->len);
416 memcpy(skb_push(sub_skb, 2), &len, 2);
417 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
418 ETH_ALEN);
419 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
420 ETH_ALEN);
421 }
422 /* Indicate the packets to upper layer */
423 if (sub_skb) {
424 sub_skb->protocol =
425 eth_type_trans(sub_skb, padapter->pnetdev);
426 sub_skb->dev = padapter->pnetdev;
427 if ((pattrib->tcpchk_valid == 1) &&
428 (pattrib->tcp_chkrpt == 1)) {
429 sub_skb->ip_summed = CHECKSUM_UNNECESSARY;
430 } else
431 sub_skb->ip_summed = CHECKSUM_NONE;
432 netif_rx(sub_skb);
433 }
434 }
435 exit:
436 prframe->u.hdr.len = 0;
437 r8712_free_recvframe(prframe, pfree_recv_queue);
438 return ret;
439 }
440
r8712_rxcmd_event_hdl(struct _adapter * padapter,void * prxcmdbuf)441 void r8712_rxcmd_event_hdl(struct _adapter *padapter, void *prxcmdbuf)
442 {
443 uint voffset;
444 u8 *poffset;
445 u16 pkt_len, cmd_len, drvinfo_sz;
446 u8 eid, cmd_seq;
447 struct recv_stat *prxstat;
448
449 poffset = (u8 *)prxcmdbuf;
450 voffset = *(uint *)poffset;
451 pkt_len = le32_to_cpu(voffset) & 0x00003fff;
452 prxstat = (struct recv_stat *)prxcmdbuf;
453 drvinfo_sz = ((le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16);
454 drvinfo_sz = drvinfo_sz << 3;
455 poffset += RXDESC_SIZE + drvinfo_sz;
456 do {
457 voffset = *(uint *)poffset;
458 cmd_len = (u16)(le32_to_cpu(voffset) & 0xffff);
459 cmd_seq = (u8)((le32_to_cpu(voffset) >> 24) & 0x7f);
460 eid = (u8)((le32_to_cpu(voffset) >> 16) & 0xff);
461 r8712_event_handle(padapter, (uint *)poffset);
462 poffset += (cmd_len + 8);/*8 bytes aligment*/
463 } while (le32_to_cpu(voffset) & BIT(31));
464
465 }
466
check_indicate_seq(struct recv_reorder_ctrl * preorder_ctrl,u16 seq_num)467 static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl,
468 u16 seq_num)
469 {
470 u8 wsize = preorder_ctrl->wsize_b;
471 u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) % 4096;
472
473 /* Rx Reorder initialize condition.*/
474 if (preorder_ctrl->indicate_seq == 0xffff)
475 preorder_ctrl->indicate_seq = seq_num;
476 /* Drop out the packet which SeqNum is smaller than WinStart */
477 if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
478 return false;
479 /*
480 * Sliding window manipulation. Conditions includes:
481 * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
482 * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
483 */
484 if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq))
485 preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq +
486 1) % 4096;
487 else if (SN_LESS(wend, seq_num)) {
488 if (seq_num >= (wsize - 1))
489 preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
490 else
491 preorder_ctrl->indicate_seq = 4095 - (wsize -
492 (seq_num + 1)) + 1;
493 }
494 return true;
495 }
496
enqueue_reorder_recvframe(struct recv_reorder_ctrl * preorder_ctrl,union recv_frame * prframe)497 static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
498 union recv_frame *prframe)
499 {
500 struct list_head *phead, *plist;
501 union recv_frame *pnextrframe;
502 struct rx_pkt_attrib *pnextattrib;
503 struct __queue *ppending_recvframe_queue =
504 &preorder_ctrl->pending_recvframe_queue;
505 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
506
507 phead = get_list_head(ppending_recvframe_queue);
508 plist = get_next(phead);
509 while (end_of_queue_search(phead, plist) == false) {
510 pnextrframe = LIST_CONTAINOR(plist, union recv_frame, u);
511 pnextattrib = &pnextrframe->u.hdr.attrib;
512 if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
513 plist = get_next(plist);
514 else if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
515 return false;
516 else
517 break;
518 }
519 list_delete(&(prframe->u.hdr.list));
520 list_insert_tail(&(prframe->u.hdr.list), plist);
521 return true;
522 }
523
r8712_recv_indicatepkts_in_order(struct _adapter * padapter,struct recv_reorder_ctrl * preorder_ctrl,int bforced)524 int r8712_recv_indicatepkts_in_order(struct _adapter *padapter,
525 struct recv_reorder_ctrl *preorder_ctrl,
526 int bforced)
527 {
528 struct list_head *phead, *plist;
529 union recv_frame *prframe;
530 struct rx_pkt_attrib *pattrib;
531 int bPktInBuf = false;
532 struct recv_priv *precvpriv = &padapter->recvpriv;
533 struct __queue *ppending_recvframe_queue =
534 &preorder_ctrl->pending_recvframe_queue;
535
536 phead = get_list_head(ppending_recvframe_queue);
537 plist = get_next(phead);
538 /* Handling some condition for forced indicate case.*/
539 if (bforced == true) {
540 if (is_list_empty(phead))
541 return true;
542 else {
543 prframe = LIST_CONTAINOR(plist, union recv_frame, u);
544 pattrib = &prframe->u.hdr.attrib;
545 preorder_ctrl->indicate_seq = pattrib->seq_num;
546 }
547 }
548 /* Prepare indication list and indication.
549 * Check if there is any packet need indicate. */
550 while (!is_list_empty(phead)) {
551 prframe = LIST_CONTAINOR(plist, union recv_frame, u);
552 pattrib = &prframe->u.hdr.attrib;
553 if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
554 plist = get_next(plist);
555 list_delete(&(prframe->u.hdr.list));
556 if (SN_EQUAL(preorder_ctrl->indicate_seq,
557 pattrib->seq_num))
558 preorder_ctrl->indicate_seq =
559 (preorder_ctrl->indicate_seq + 1) % 4096;
560 /*indicate this recv_frame*/
561 if (!pattrib->amsdu) {
562 if ((padapter->bDriverStopped == false) &&
563 (padapter->bSurpriseRemoved == false)) {
564 /* indicate this recv_frame */
565 r8712_recv_indicatepkt(padapter,
566 prframe);
567 }
568 } else if (pattrib->amsdu == 1) {
569 if (amsdu_to_msdu(padapter, prframe) !=
570 _SUCCESS)
571 r8712_free_recvframe(prframe,
572 &precvpriv->free_recv_queue);
573 }
574 /* Update local variables. */
575 bPktInBuf = false;
576 } else {
577 bPktInBuf = true;
578 break;
579 }
580 }
581 return bPktInBuf;
582 }
583
recv_indicatepkt_reorder(struct _adapter * padapter,union recv_frame * prframe)584 static int recv_indicatepkt_reorder(struct _adapter *padapter,
585 union recv_frame *prframe)
586 {
587 unsigned long irql;
588 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
589 struct recv_reorder_ctrl *preorder_ctrl = prframe->u.hdr.preorder_ctrl;
590 struct __queue *ppending_recvframe_queue =
591 &preorder_ctrl->pending_recvframe_queue;
592
593 if (!pattrib->amsdu) {
594 /* s1. */
595 r8712_wlanhdr_to_ethhdr(prframe);
596 if (pattrib->qos != 1) {
597 if ((padapter->bDriverStopped == false) &&
598 (padapter->bSurpriseRemoved == false)) {
599 r8712_recv_indicatepkt(padapter, prframe);
600 return _SUCCESS;
601 } else
602 return _FAIL;
603 }
604 }
605 spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
606 /*s2. check if winstart_b(indicate_seq) needs to been updated*/
607 if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num))
608 goto _err_exit;
609 /*s3. Insert all packet into Reorder Queue to maintain its ordering.*/
610 if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
611 goto _err_exit;
612 /*s4.
613 * Indication process.
614 * After Packet dropping and Sliding Window shifting as above, we can
615 * now just indicate the packets with the SeqNum smaller than latest
616 * WinStart and buffer other packets.
617 *
618 * For Rx Reorder condition:
619 * 1. All packets with SeqNum smaller than WinStart => Indicate
620 * 2. All packets with SeqNum larger than or equal to
621 * WinStart => Buffer it.
622 */
623 if (r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, false) ==
624 true) {
625 _set_timer(&preorder_ctrl->reordering_ctrl_timer,
626 REORDER_WAIT_TIME);
627 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
628 } else {
629 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
630 _cancel_timer_ex(&preorder_ctrl->reordering_ctrl_timer);
631 }
632 return _SUCCESS;
633 _err_exit:
634 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
635 return _FAIL;
636 }
637
r8712_reordering_ctrl_timeout_handler(void * pcontext)638 void r8712_reordering_ctrl_timeout_handler(void *pcontext)
639 {
640 unsigned long irql;
641 struct recv_reorder_ctrl *preorder_ctrl =
642 (struct recv_reorder_ctrl *)pcontext;
643 struct _adapter *padapter = preorder_ctrl->padapter;
644 struct __queue *ppending_recvframe_queue =
645 &preorder_ctrl->pending_recvframe_queue;
646
647 if (padapter->bDriverStopped || padapter->bSurpriseRemoved)
648 return;
649 spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
650 r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, true);
651 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
652 }
653
r8712_process_recv_indicatepkts(struct _adapter * padapter,union recv_frame * prframe)654 static int r8712_process_recv_indicatepkts(struct _adapter *padapter,
655 union recv_frame *prframe)
656 {
657 int retval = _SUCCESS;
658 struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
659 struct ht_priv *phtpriv = &pmlmepriv->htpriv;
660
661 if (phtpriv->ht_option == 1) { /*B/G/N Mode*/
662 if (recv_indicatepkt_reorder(padapter, prframe) != _SUCCESS) {
663 /* including perform A-MPDU Rx Ordering Buffer Control*/
664 if ((padapter->bDriverStopped == false) &&
665 (padapter->bSurpriseRemoved == false))
666 return _FAIL;
667 }
668 } else { /*B/G mode*/
669 retval = r8712_wlanhdr_to_ethhdr(prframe);
670 if (retval != _SUCCESS)
671 return retval;
672 if ((padapter->bDriverStopped == false) &&
673 (padapter->bSurpriseRemoved == false)) {
674 /* indicate this recv_frame */
675 r8712_recv_indicatepkt(padapter, prframe);
676 } else
677 return _FAIL;
678 }
679 return retval;
680 }
681
query_rx_pwr_percentage(s8 antpower)682 static u8 query_rx_pwr_percentage(s8 antpower)
683 {
684 if ((antpower <= -100) || (antpower >= 20))
685 return 0;
686 else if (antpower >= 0)
687 return 100;
688 else
689 return 100 + antpower;
690 }
691
evm_db2percentage(s8 value)692 static u8 evm_db2percentage(s8 value)
693 {
694 /*
695 * -33dB~0dB to 0%~99%
696 */
697 s8 ret_val;
698
699 ret_val = value;
700 if (ret_val >= 0)
701 ret_val = 0;
702 if (ret_val <= -33)
703 ret_val = -33;
704 ret_val = -ret_val;
705 ret_val *= 3;
706 if (ret_val == 99)
707 ret_val = 100;
708 return ret_val;
709 }
710
r8712_signal_scale_mapping(s32 cur_sig)711 s32 r8712_signal_scale_mapping(s32 cur_sig)
712 {
713 s32 ret_sig;
714
715 if (cur_sig >= 51 && cur_sig <= 100)
716 ret_sig = 100;
717 else if (cur_sig >= 41 && cur_sig <= 50)
718 ret_sig = 80 + ((cur_sig - 40) * 2);
719 else if (cur_sig >= 31 && cur_sig <= 40)
720 ret_sig = 66 + (cur_sig - 30);
721 else if (cur_sig >= 21 && cur_sig <= 30)
722 ret_sig = 54 + (cur_sig - 20);
723 else if (cur_sig >= 10 && cur_sig <= 20)
724 ret_sig = 42 + (((cur_sig - 10) * 2) / 3);
725 else if (cur_sig >= 5 && cur_sig <= 9)
726 ret_sig = 22 + (((cur_sig - 5) * 3) / 2);
727 else if (cur_sig >= 1 && cur_sig <= 4)
728 ret_sig = 6 + (((cur_sig - 1) * 3) / 2);
729 else
730 ret_sig = cur_sig;
731 return ret_sig;
732 }
733
translate2dbm(struct _adapter * padapter,u8 signal_strength_idx)734 static s32 translate2dbm(struct _adapter *padapter, u8 signal_strength_idx)
735 {
736 s32 signal_power; /* in dBm.*/
737 /* Translate to dBm (x=0.5y-95).*/
738 signal_power = (s32)((signal_strength_idx + 1) >> 1);
739 signal_power -= 95;
740 return signal_power;
741 }
742
query_rx_phy_status(struct _adapter * padapter,union recv_frame * prframe)743 static void query_rx_phy_status(struct _adapter *padapter,
744 union recv_frame *prframe)
745 {
746 u8 i, max_spatial_stream, evm;
747 struct recv_stat *prxstat = (struct recv_stat *)prframe->u.hdr.rx_head;
748 struct phy_stat *pphy_stat = (struct phy_stat *)(prxstat + 1);
749 u8 *pphy_head = (u8 *)(prxstat + 1);
750 s8 rx_pwr[4], rx_pwr_all;
751 u8 pwdb_all;
752 u32 rssi, total_rssi = 0;
753 u8 bcck_rate = 0, rf_rx_num = 0, cck_highpwr = 0;
754 struct phy_cck_rx_status *pcck_buf;
755 u8 sq;
756
757 /* Record it for next packet processing*/
758 bcck_rate = (prframe->u.hdr.attrib.mcs_rate <= 3 ? 1 : 0);
759 if (bcck_rate) {
760 u8 report;
761
762 /* CCK Driver info Structure is not the same as OFDM packet.*/
763 pcck_buf = (struct phy_cck_rx_status *)pphy_stat;
764 /* (1)Hardware does not provide RSSI for CCK
765 * (2)PWDB, Average PWDB cacluated by hardware
766 * (for rate adaptive)
767 */
768 if (!cck_highpwr) {
769 report = pcck_buf->cck_agc_rpt & 0xc0;
770 report = report >> 6;
771 switch (report) {
772 /* Modify the RF RNA gain value to -40, -20,
773 * -2, 14 by Jenyu's suggestion
774 * Note: different RF with the different
775 * RNA gain. */
776 case 0x3:
777 rx_pwr_all = -40 - (pcck_buf->cck_agc_rpt &
778 0x3e);
779 break;
780 case 0x2:
781 rx_pwr_all = -20 - (pcck_buf->cck_agc_rpt &
782 0x3e);
783 break;
784 case 0x1:
785 rx_pwr_all = -2 - (pcck_buf->cck_agc_rpt &
786 0x3e);
787 break;
788 case 0x0:
789 rx_pwr_all = 14 - (pcck_buf->cck_agc_rpt &
790 0x3e);
791 break;
792 }
793 } else {
794 report = ((u8)(le32_to_cpu(pphy_stat->phydw1) >> 8)) &
795 0x60;
796 report = report >> 5;
797 switch (report) {
798 case 0x3:
799 rx_pwr_all = -40 - ((pcck_buf->cck_agc_rpt &
800 0x1f) << 1);
801 break;
802 case 0x2:
803 rx_pwr_all = -20 - ((pcck_buf->cck_agc_rpt &
804 0x1f) << 1);
805 break;
806 case 0x1:
807 rx_pwr_all = -2 - ((pcck_buf->cck_agc_rpt &
808 0x1f) << 1);
809 break;
810 case 0x0:
811 rx_pwr_all = 14 - ((pcck_buf->cck_agc_rpt &
812 0x1f) << 1);
813 break;
814 }
815 }
816 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
817 /* CCK gain is smaller than OFDM/MCS gain,*/
818 /* so we add gain diff by experiences, the val is 6 */
819 pwdb_all += 6;
820 if (pwdb_all > 100)
821 pwdb_all = 100;
822 /* modify the offset to make the same gain index with OFDM.*/
823 if (pwdb_all > 34 && pwdb_all <= 42)
824 pwdb_all -= 2;
825 else if (pwdb_all > 26 && pwdb_all <= 34)
826 pwdb_all -= 6;
827 else if (pwdb_all > 14 && pwdb_all <= 26)
828 pwdb_all -= 8;
829 else if (pwdb_all > 4 && pwdb_all <= 14)
830 pwdb_all -= 4;
831 /*
832 * (3) Get Signal Quality (EVM)
833 */
834 if (pwdb_all > 40)
835 sq = 100;
836 else {
837 sq = pcck_buf->sq_rpt;
838 if (pcck_buf->sq_rpt > 64)
839 sq = 0;
840 else if (pcck_buf->sq_rpt < 20)
841 sq = 100;
842 else
843 sq = ((64-sq) * 100) / 44;
844 }
845 prframe->u.hdr.attrib.signal_qual = sq;
846 prframe->u.hdr.attrib.rx_mimo_signal_qual[0] = sq;
847 prframe->u.hdr.attrib.rx_mimo_signal_qual[1] = -1;
848 } else {
849 /* (1)Get RSSI for HT rate */
850 for (i = 0; i < ((padapter->registrypriv.rf_config) &
851 0x0f) ; i++) {
852 rf_rx_num++;
853 rx_pwr[i] = ((pphy_head[PHY_STAT_GAIN_TRSW_SHT + i]
854 & 0x3F) * 2) - 110;
855 /* Translate DBM to percentage. */
856 rssi = query_rx_pwr_percentage(rx_pwr[i]);
857 total_rssi += rssi;
858 }
859 /* (2)PWDB, Average PWDB cacluated by hardware (for
860 * rate adaptive) */
861 rx_pwr_all = (((pphy_head[PHY_STAT_PWDB_ALL_SHT]) >> 1) & 0x7f)
862 - 106;
863 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
864
865 {
866 /* (3)EVM of HT rate */
867 if (prframe->u.hdr.attrib.htc &&
868 prframe->u.hdr.attrib.mcs_rate >= 20 &&
869 prframe->u.hdr.attrib.mcs_rate <= 27) {
870 /* both spatial stream make sense */
871 max_spatial_stream = 2;
872 } else {
873 /* only spatial stream 1 makes sense */
874 max_spatial_stream = 1;
875 }
876 for (i = 0; i < max_spatial_stream; i++) {
877 evm = evm_db2percentage((pphy_head
878 [PHY_STAT_RXEVM_SHT + i]));/*dbm*/
879 prframe->u.hdr.attrib.signal_qual =
880 (u8)(evm & 0xff);
881 prframe->u.hdr.attrib.rx_mimo_signal_qual[i] =
882 (u8)(evm & 0xff);
883 }
884 }
885 }
886 /* UI BSS List signal strength(in percentage), make it good looking,
887 * from 0~100. It is assigned to the BSS List in
888 * GetValueFromBeaconOrProbeRsp(). */
889 if (bcck_rate)
890 prframe->u.hdr.attrib.signal_strength =
891 (u8)r8712_signal_scale_mapping(pwdb_all);
892 else {
893 if (rf_rx_num != 0)
894 prframe->u.hdr.attrib.signal_strength =
895 (u8)(r8712_signal_scale_mapping(total_rssi /=
896 rf_rx_num));
897 }
898 }
899
process_link_qual(struct _adapter * padapter,union recv_frame * prframe)900 static void process_link_qual(struct _adapter *padapter,
901 union recv_frame *prframe)
902 {
903 u32 last_evm = 0, tmpVal;
904 struct rx_pkt_attrib *pattrib;
905
906 if (prframe == NULL || padapter == NULL)
907 return;
908 pattrib = &prframe->u.hdr.attrib;
909 if (pattrib->signal_qual != 0) {
910 /*
911 * 1. Record the general EVM to the sliding window.
912 */
913 if (padapter->recvpriv.signal_qual_data.total_num++ >=
914 PHY_LINKQUALITY_SLID_WIN_MAX) {
915 padapter->recvpriv.signal_qual_data.total_num =
916 PHY_LINKQUALITY_SLID_WIN_MAX;
917 last_evm = padapter->recvpriv.signal_qual_data.elements
918 [padapter->recvpriv.signal_qual_data.index];
919 padapter->recvpriv.signal_qual_data.total_val -=
920 last_evm;
921 }
922 padapter->recvpriv.signal_qual_data.total_val +=
923 pattrib->signal_qual;
924 padapter->recvpriv.signal_qual_data.elements[padapter->
925 recvpriv.signal_qual_data.index++] =
926 pattrib->signal_qual;
927 if (padapter->recvpriv.signal_qual_data.index >=
928 PHY_LINKQUALITY_SLID_WIN_MAX)
929 padapter->recvpriv.signal_qual_data.index = 0;
930
931 /* <1> Showed on UI for user, in percentage. */
932 tmpVal = padapter->recvpriv.signal_qual_data.total_val /
933 padapter->recvpriv.signal_qual_data.total_num;
934 padapter->recvpriv.signal = (u8)tmpVal;
935 }
936 }
937
process_rssi(struct _adapter * padapter,union recv_frame * prframe)938 static void process_rssi(struct _adapter *padapter, union recv_frame *prframe)
939 {
940 u32 last_rssi, tmp_val;
941 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
942
943 if (padapter->recvpriv.signal_strength_data.total_num++ >=
944 PHY_RSSI_SLID_WIN_MAX) {
945 padapter->recvpriv.signal_strength_data.total_num =
946 PHY_RSSI_SLID_WIN_MAX;
947 last_rssi = padapter->recvpriv.signal_strength_data.elements
948 [padapter->recvpriv.signal_strength_data.index];
949 padapter->recvpriv.signal_strength_data.total_val -= last_rssi;
950 }
951 padapter->recvpriv.signal_strength_data.total_val +=
952 pattrib->signal_strength;
953 padapter->recvpriv.signal_strength_data.elements[padapter->recvpriv.
954 signal_strength_data.index++] =
955 pattrib->signal_strength;
956 if (padapter->recvpriv.signal_strength_data.index >=
957 PHY_RSSI_SLID_WIN_MAX)
958 padapter->recvpriv.signal_strength_data.index = 0;
959 tmp_val = padapter->recvpriv.signal_strength_data.total_val /
960 padapter->recvpriv.signal_strength_data.total_num;
961 padapter->recvpriv.rssi = (s8)translate2dbm(padapter, (u8)tmp_val);
962 }
963
process_phy_info(struct _adapter * padapter,union recv_frame * prframe)964 static void process_phy_info(struct _adapter *padapter,
965 union recv_frame *prframe)
966 {
967 query_rx_phy_status(padapter, prframe);
968 process_rssi(padapter, prframe);
969 process_link_qual(padapter, prframe);
970 }
971
recv_func(struct _adapter * padapter,void * pcontext)972 int recv_func(struct _adapter *padapter, void *pcontext)
973 {
974 struct rx_pkt_attrib *pattrib;
975 union recv_frame *prframe, *orig_prframe;
976 int retval = _SUCCESS;
977 struct __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
978 struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
979
980 prframe = (union recv_frame *)pcontext;
981 orig_prframe = prframe;
982 pattrib = &prframe->u.hdr.attrib;
983 if ((check_fwstate(pmlmepriv, WIFI_MP_STATE) == true)) {
984 if (pattrib->crc_err == 1)
985 padapter->mppriv.rx_crcerrpktcount++;
986 else
987 padapter->mppriv.rx_pktcount++;
988 if (check_fwstate(pmlmepriv, WIFI_MP_LPBK_STATE) == false) {
989 /* free this recv_frame */
990 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
991 goto _exit_recv_func;
992 }
993 }
994 /* check the frame crtl field and decache */
995 retval = r8712_validate_recv_frame(padapter, prframe);
996 if (retval != _SUCCESS) {
997 /* free this recv_frame */
998 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
999 goto _exit_recv_func;
1000 }
1001 process_phy_info(padapter, prframe);
1002 prframe = r8712_decryptor(padapter, prframe);
1003 if (prframe == NULL) {
1004 retval = _FAIL;
1005 goto _exit_recv_func;
1006 }
1007 prframe = r8712_recvframe_chk_defrag(padapter, prframe);
1008 if (prframe == NULL)
1009 goto _exit_recv_func;
1010 prframe = r8712_portctrl(padapter, prframe);
1011 if (prframe == NULL) {
1012 retval = _FAIL;
1013 goto _exit_recv_func;
1014 }
1015 retval = r8712_process_recv_indicatepkts(padapter, prframe);
1016 if (retval != _SUCCESS) {
1017 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
1018 goto _exit_recv_func;
1019 }
1020 _exit_recv_func:
1021 return retval;
1022 }
1023
recvbuf2recvframe(struct _adapter * padapter,struct sk_buff * pskb)1024 static int recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
1025 {
1026 u8 *pbuf, shift_sz = 0;
1027 u8 frag, mf;
1028 uint pkt_len;
1029 u32 transfer_len;
1030 struct recv_stat *prxstat;
1031 u16 pkt_cnt, drvinfo_sz, pkt_offset, tmp_len, alloc_sz;
1032 struct __queue *pfree_recv_queue;
1033 _pkt *pkt_copy = NULL;
1034 union recv_frame *precvframe = NULL;
1035 struct recv_priv *precvpriv = &padapter->recvpriv;
1036
1037 pfree_recv_queue = &(precvpriv->free_recv_queue);
1038 pbuf = pskb->data;
1039 prxstat = (struct recv_stat *)pbuf;
1040 pkt_cnt = (le32_to_cpu(prxstat->rxdw2)>>16)&0xff;
1041 pkt_len = le32_to_cpu(prxstat->rxdw0)&0x00003fff;
1042 transfer_len = pskb->len;
1043 /* Test throughput with Netgear 3700 (No security) with Chariot 3T3R
1044 * pairs. The packet count will be a big number so that the containing
1045 * packet will effect the Rx reordering. */
1046 if (transfer_len < pkt_len) {
1047 /* In this case, it means the MAX_RECVBUF_SZ is too small to
1048 * get the data from 8712u. */
1049 return _FAIL;
1050 }
1051 do {
1052 prxstat = (struct recv_stat *)pbuf;
1053 pkt_len = le32_to_cpu(prxstat->rxdw0)&0x00003fff;
1054 /* more fragment bit */
1055 mf = (le32_to_cpu(prxstat->rxdw1) >> 27) & 0x1;
1056 /* ragmentation number */
1057 frag = (le32_to_cpu(prxstat->rxdw2) >> 12) & 0xf;
1058 /* uint 2^3 = 8 bytes */
1059 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
1060 drvinfo_sz = drvinfo_sz<<3;
1061 if (pkt_len <= 0)
1062 goto _exit_recvbuf2recvframe;
1063 /* Qos data, wireless lan header length is 26 */
1064 if ((le32_to_cpu(prxstat->rxdw0) >> 23) & 0x01)
1065 shift_sz = 2;
1066 precvframe = r8712_alloc_recvframe(pfree_recv_queue);
1067 if (precvframe == NULL)
1068 goto _exit_recvbuf2recvframe;
1069 _init_listhead(&precvframe->u.hdr.list);
1070 precvframe->u.hdr.precvbuf = NULL; /*can't access the precvbuf*/
1071 precvframe->u.hdr.len = 0;
1072 tmp_len = pkt_len + drvinfo_sz + RXDESC_SIZE;
1073 pkt_offset = (u16)_RND128(tmp_len);
1074 /* for first fragment packet, driver need allocate 1536 +
1075 * drvinfo_sz + RXDESC_SIZE to defrag packet. */
1076 if ((mf == 1) && (frag == 0))
1077 alloc_sz = 1658;/*1658+6=1664, 1664 is 128 alignment.*/
1078 else
1079 alloc_sz = tmp_len;
1080 /* 2 is for IP header 4 bytes alignment in QoS packet case.
1081 * 4 is for skb->data 4 bytes alignment. */
1082 alloc_sz += 6;
1083 pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz);
1084 if (pkt_copy) {
1085 pkt_copy->dev = padapter->pnetdev;
1086 precvframe->u.hdr.pkt = pkt_copy;
1087 skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data)
1088 % 4));
1089 skb_reserve(pkt_copy, shift_sz);
1090 memcpy(pkt_copy->data, pbuf, tmp_len);
1091 precvframe->u.hdr.rx_head = precvframe->u.hdr.rx_data =
1092 precvframe->u.hdr.rx_tail = pkt_copy->data;
1093 precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
1094 } else {
1095 precvframe->u.hdr.pkt = skb_clone(pskb, GFP_ATOMIC);
1096 precvframe->u.hdr.rx_head = pbuf;
1097 precvframe->u.hdr.rx_data = pbuf;
1098 precvframe->u.hdr.rx_tail = pbuf;
1099 precvframe->u.hdr.rx_end = pbuf + alloc_sz;
1100 }
1101 recvframe_put(precvframe, tmp_len);
1102 recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE);
1103 /* because the endian issue, driver avoid reference to the
1104 * rxstat after calling update_recvframe_attrib_from_recvstat();
1105 */
1106 update_recvframe_attrib_from_recvstat(&precvframe->u.hdr.attrib,
1107 prxstat);
1108 r8712_recv_entry(precvframe);
1109 transfer_len -= pkt_offset;
1110 pbuf += pkt_offset;
1111 pkt_cnt--;
1112 precvframe = NULL;
1113 pkt_copy = NULL;
1114 } while ((transfer_len > 0) && pkt_cnt > 0);
1115 _exit_recvbuf2recvframe:
1116 return _SUCCESS;
1117 }
1118
recv_tasklet(void * priv)1119 static void recv_tasklet(void *priv)
1120 {
1121 struct sk_buff *pskb;
1122 struct _adapter *padapter = (struct _adapter *)priv;
1123 struct recv_priv *precvpriv = &padapter->recvpriv;
1124
1125 while (NULL != (pskb = skb_dequeue(&precvpriv->rx_skb_queue))) {
1126 recvbuf2recvframe(padapter, pskb);
1127 skb_reset_tail_pointer(pskb);
1128 pskb->len = 0;
1129 if (!skb_cloned(pskb))
1130 skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
1131 else
1132 consume_skb(pskb);
1133 }
1134 }
1135