1 // SPDX-License-Identifier: GPL-2.0
2 /******************************************************************************
3  * rtl8712_recv.c
4  *
5  * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
6  * Linux device driver for RTL8192SU
7  *
8  * Modifications for inclusion into the Linux staging tree are
9  * Copyright(c) 2010 Larry Finger. All rights reserved.
10  *
11  * Contact information:
12  * WLAN FAE <wlanfae@realtek.com>
13  * Larry Finger <Larry.Finger@lwfinger.net>
14  *
15  ******************************************************************************/
16 
17 #define _RTL8712_RECV_C_
18 
19 #include <linux/if_ether.h>
20 #include <linux/ip.h>
21 #include <net/cfg80211.h>
22 
23 #include "osdep_service.h"
24 #include "drv_types.h"
25 #include "recv_osdep.h"
26 #include "mlme_osdep.h"
27 #include "ethernet.h"
28 #include "usb_ops.h"
29 #include "wifi.h"
30 
31 static void recv_tasklet(struct tasklet_struct *t);
32 
r8712_init_recv_priv(struct recv_priv * precvpriv,struct _adapter * padapter)33 void r8712_init_recv_priv(struct recv_priv *precvpriv,
34 			  struct _adapter *padapter)
35 {
36 	int i;
37 	struct recv_buf *precvbuf;
38 	addr_t tmpaddr = 0;
39 	int alignment = 0;
40 	struct sk_buff *pskb = NULL;
41 
42 	/*init recv_buf*/
43 	_init_queue(&precvpriv->free_recv_buf_queue);
44 	precvpriv->pallocated_recv_buf =
45 		kzalloc(NR_RECVBUFF * sizeof(struct recv_buf) + 4, GFP_ATOMIC);
46 	if (!precvpriv->pallocated_recv_buf)
47 		return;
48 	precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 -
49 			      ((addr_t)(precvpriv->pallocated_recv_buf) & 3);
50 	precvbuf = (struct recv_buf *)precvpriv->precv_buf;
51 	for (i = 0; i < NR_RECVBUFF; i++) {
52 		INIT_LIST_HEAD(&precvbuf->list);
53 		spin_lock_init(&precvbuf->recvbuf_lock);
54 		if (r8712_os_recvbuf_resource_alloc(padapter, precvbuf))
55 			break;
56 		precvbuf->ref_cnt = 0;
57 		precvbuf->adapter = padapter;
58 		list_add_tail(&precvbuf->list,
59 			      &precvpriv->free_recv_buf_queue.queue);
60 		precvbuf++;
61 	}
62 	precvpriv->free_recv_buf_queue_cnt = NR_RECVBUFF;
63 	tasklet_setup(&precvpriv->recv_tasklet, recv_tasklet);
64 	skb_queue_head_init(&precvpriv->rx_skb_queue);
65 
66 	skb_queue_head_init(&precvpriv->free_recv_skb_queue);
67 	for (i = 0; i < NR_PREALLOC_RECV_SKB; i++) {
68 		pskb = netdev_alloc_skb(padapter->pnetdev, MAX_RECVBUF_SZ +
69 		       RECVBUFF_ALIGN_SZ);
70 		if (pskb) {
71 			tmpaddr = (addr_t)pskb->data;
72 			alignment = tmpaddr & (RECVBUFF_ALIGN_SZ - 1);
73 			skb_reserve(pskb, (RECVBUFF_ALIGN_SZ - alignment));
74 			skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
75 		}
76 		pskb = NULL;
77 	}
78 }
79 
r8712_free_recv_priv(struct recv_priv * precvpriv)80 void r8712_free_recv_priv(struct recv_priv *precvpriv)
81 {
82 	int i;
83 	struct recv_buf *precvbuf;
84 	struct _adapter *padapter = precvpriv->adapter;
85 
86 	precvbuf = (struct recv_buf *)precvpriv->precv_buf;
87 	for (i = 0; i < NR_RECVBUFF; i++) {
88 		r8712_os_recvbuf_resource_free(padapter, precvbuf);
89 		precvbuf++;
90 	}
91 	kfree(precvpriv->pallocated_recv_buf);
92 	skb_queue_purge(&precvpriv->rx_skb_queue);
93 	if (skb_queue_len(&precvpriv->rx_skb_queue))
94 		netdev_warn(padapter->pnetdev, "r8712u: rx_skb_queue not empty\n");
95 	skb_queue_purge(&precvpriv->free_recv_skb_queue);
96 	if (skb_queue_len(&precvpriv->free_recv_skb_queue))
97 		netdev_warn(padapter->pnetdev, "r8712u: free_recv_skb_queue not empty %d\n",
98 			    skb_queue_len(&precvpriv->free_recv_skb_queue));
99 }
100 
r8712_init_recvbuf(struct _adapter * padapter,struct recv_buf * precvbuf)101 void r8712_init_recvbuf(struct _adapter *padapter, struct recv_buf *precvbuf)
102 {
103 	precvbuf->transfer_len = 0;
104 	precvbuf->len = 0;
105 	precvbuf->ref_cnt = 0;
106 	if (precvbuf->pbuf) {
107 		precvbuf->pdata = precvbuf->pbuf;
108 		precvbuf->phead = precvbuf->pbuf;
109 		precvbuf->ptail = precvbuf->pbuf;
110 		precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ;
111 	}
112 }
113 
r8712_free_recvframe(union recv_frame * precvframe,struct __queue * pfree_recv_queue)114 void r8712_free_recvframe(union recv_frame *precvframe,
115 			  struct  __queue *pfree_recv_queue)
116 {
117 	unsigned long irqL;
118 	struct _adapter *padapter = precvframe->u.hdr.adapter;
119 	struct recv_priv *precvpriv = &padapter->recvpriv;
120 
121 	if (precvframe->u.hdr.pkt) {
122 		dev_kfree_skb_any(precvframe->u.hdr.pkt);/*free skb by driver*/
123 		precvframe->u.hdr.pkt = NULL;
124 	}
125 	spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
126 	list_del_init(&precvframe->u.hdr.list);
127 	list_add_tail(&precvframe->u.hdr.list, &pfree_recv_queue->queue);
128 	if (padapter) {
129 		if (pfree_recv_queue == &precvpriv->free_recv_queue)
130 			precvpriv->free_recvframe_cnt++;
131 	}
132 	spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
133 }
134 
update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib * pattrib,struct recv_stat * prxstat)135 static void update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib *pattrib,
136 						  struct recv_stat *prxstat)
137 {
138 	u16 drvinfo_sz;
139 
140 	drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
141 	drvinfo_sz <<= 3;
142 	/*TODO:
143 	 * Offset 0
144 	 */
145 	pattrib->bdecrypted = (le32_to_cpu(prxstat->rxdw0) & BIT(27)) == 0;
146 	pattrib->crc_err = (le32_to_cpu(prxstat->rxdw0) & BIT(14)) != 0;
147 	/*Offset 4*/
148 	/*Offset 8*/
149 	/*Offset 12*/
150 	if (le32_to_cpu(prxstat->rxdw3) & BIT(13)) {
151 		pattrib->tcpchk_valid = 1; /* valid */
152 		if (le32_to_cpu(prxstat->rxdw3) & BIT(11))
153 			pattrib->tcp_chkrpt = 1; /* correct */
154 		else
155 			pattrib->tcp_chkrpt = 0; /* incorrect */
156 		if (le32_to_cpu(prxstat->rxdw3) & BIT(12))
157 			pattrib->ip_chkrpt = 1; /* correct */
158 		else
159 			pattrib->ip_chkrpt = 0; /* incorrect */
160 	} else {
161 		pattrib->tcpchk_valid = 0; /* invalid */
162 	}
163 	pattrib->mcs_rate = (u8)((le32_to_cpu(prxstat->rxdw3)) & 0x3f);
164 	pattrib->htc = (u8)((le32_to_cpu(prxstat->rxdw3) >> 14) & 0x1);
165 	/*Offset 16*/
166 	/*Offset 20*/
167 	/*phy_info*/
168 }
169 
170 /*perform defrag*/
recvframe_defrag(struct _adapter * adapter,struct __queue * defrag_q)171 static union recv_frame *recvframe_defrag(struct _adapter *adapter,
172 					  struct  __queue *defrag_q)
173 {
174 	struct list_head *plist, *phead;
175 	u8 wlanhdr_offset;
176 	u8	curfragnum;
177 	struct recv_frame_hdr *pfhdr, *pnfhdr;
178 	union recv_frame *prframe, *pnextrframe;
179 	struct  __queue	*pfree_recv_queue;
180 
181 	pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
182 	phead = &defrag_q->queue;
183 	plist = phead->next;
184 	prframe = container_of(plist, union recv_frame, u.list);
185 	list_del_init(&prframe->u.list);
186 	pfhdr = &prframe->u.hdr;
187 	curfragnum = 0;
188 	if (curfragnum != pfhdr->attrib.frag_num) {
189 		/*the first fragment number must be 0
190 		 *free the whole queue
191 		 */
192 		r8712_free_recvframe(prframe, pfree_recv_queue);
193 		r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
194 		return NULL;
195 	}
196 	curfragnum++;
197 	plist = &defrag_q->queue;
198 	plist = plist->next;
199 	while (!end_of_queue_search(phead, plist)) {
200 		pnextrframe = container_of(plist, union recv_frame, u.list);
201 		pnfhdr = &pnextrframe->u.hdr;
202 		/*check the fragment sequence  (2nd ~n fragment frame) */
203 		if (curfragnum != pnfhdr->attrib.frag_num) {
204 			/* the fragment number must increase  (after decache)
205 			 * release the defrag_q & prframe
206 			 */
207 			r8712_free_recvframe(prframe, pfree_recv_queue);
208 			r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
209 			return NULL;
210 		}
211 		curfragnum++;
212 		/* copy the 2nd~n fragment frame's payload to the first fragment
213 		 * get the 2nd~last fragment frame's payload
214 		 */
215 		wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;
216 		recvframe_pull(pnextrframe, wlanhdr_offset);
217 		/* append  to first fragment frame's tail (if privacy frame,
218 		 * pull the ICV)
219 		 */
220 		recvframe_pull_tail(prframe, pfhdr->attrib.icv_len);
221 		memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len);
222 		recvframe_put(prframe, pnfhdr->len);
223 		pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
224 		plist = plist->next;
225 	}
226 	/* free the defrag_q queue and return the prframe */
227 	r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
228 	return prframe;
229 }
230 
231 /* 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)232 union recv_frame *r8712_recvframe_chk_defrag(struct _adapter *padapter,
233 					     union recv_frame *precv_frame)
234 {
235 	u8	ismfrag;
236 	u8	fragnum;
237 	u8   *psta_addr;
238 	struct recv_frame_hdr *pfhdr;
239 	struct sta_info *psta;
240 	struct	sta_priv *pstapriv;
241 	struct list_head *phead;
242 	union recv_frame *prtnframe = NULL;
243 	struct  __queue *pfree_recv_queue, *pdefrag_q;
244 
245 	pstapriv = &padapter->stapriv;
246 	pfhdr = &precv_frame->u.hdr;
247 	pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
248 	/* need to define struct of wlan header frame ctrl */
249 	ismfrag = pfhdr->attrib.mfrag;
250 	fragnum = pfhdr->attrib.frag_num;
251 	psta_addr = pfhdr->attrib.ta;
252 	psta = r8712_get_stainfo(pstapriv, psta_addr);
253 	if (!psta)
254 		pdefrag_q = NULL;
255 	else
256 		pdefrag_q = &psta->sta_recvpriv.defrag_q;
257 
258 	if ((ismfrag == 0) && (fragnum == 0))
259 		prtnframe = precv_frame;/*isn't a fragment frame*/
260 	if (ismfrag == 1) {
261 		/* 0~(n-1) fragment frame
262 		 * enqueue to defraf_g
263 		 */
264 		if (pdefrag_q) {
265 			if (fragnum == 0) {
266 				/*the first fragment*/
267 				if (!list_empty(&pdefrag_q->queue)) {
268 					/*free current defrag_q */
269 					r8712_free_recvframe_queue(pdefrag_q,
270 							     pfree_recv_queue);
271 				}
272 			}
273 			/* Then enqueue the 0~(n-1) fragment to the defrag_q */
274 			phead = &pdefrag_q->queue;
275 			list_add_tail(&pfhdr->list, phead);
276 			prtnframe = NULL;
277 		} else {
278 			/* can't find this ta's defrag_queue, so free this
279 			 * recv_frame
280 			 */
281 			r8712_free_recvframe(precv_frame, pfree_recv_queue);
282 			prtnframe = NULL;
283 		}
284 	}
285 	if ((ismfrag == 0) && (fragnum != 0)) {
286 		/* the last fragment frame
287 		 * enqueue the last fragment
288 		 */
289 		if (pdefrag_q) {
290 			phead = &pdefrag_q->queue;
291 			list_add_tail(&pfhdr->list, phead);
292 			/*call recvframe_defrag to defrag*/
293 			precv_frame = recvframe_defrag(padapter, pdefrag_q);
294 			prtnframe = precv_frame;
295 		} else {
296 			/* can't find this ta's defrag_queue, so free this
297 			 *  recv_frame
298 			 */
299 			r8712_free_recvframe(precv_frame, pfree_recv_queue);
300 			prtnframe = NULL;
301 		}
302 	}
303 	if (prtnframe && (prtnframe->u.hdr.attrib.privacy)) {
304 		/* after defrag we must check tkip mic code */
305 		if (r8712_recvframe_chkmic(padapter, prtnframe) == _FAIL) {
306 			r8712_free_recvframe(prtnframe, pfree_recv_queue);
307 			prtnframe = NULL;
308 		}
309 	}
310 	return prtnframe;
311 }
312 
amsdu_to_msdu(struct _adapter * padapter,union recv_frame * prframe)313 static void amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe)
314 {
315 	int	a_len, padding_len;
316 	u16	eth_type, nSubframe_Length;
317 	u8	nr_subframes, i;
318 	unsigned char *pdata;
319 	struct rx_pkt_attrib *pattrib;
320 	_pkt *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
321 	struct recv_priv *precvpriv = &padapter->recvpriv;
322 	struct  __queue *pfree_recv_queue = &precvpriv->free_recv_queue;
323 
324 	nr_subframes = 0;
325 	pattrib = &prframe->u.hdr.attrib;
326 	recvframe_pull(prframe, prframe->u.hdr.attrib.hdrlen);
327 	if (prframe->u.hdr.attrib.iv_len > 0)
328 		recvframe_pull(prframe, prframe->u.hdr.attrib.iv_len);
329 	a_len = prframe->u.hdr.len;
330 	pdata = prframe->u.hdr.rx_data;
331 	while (a_len > ETH_HLEN) {
332 		/* Offset 12 denote 2 mac address */
333 		nSubframe_Length = *((u16 *)(pdata + 12));
334 		/*==m==>change the length order*/
335 		nSubframe_Length = (nSubframe_Length >> 8) +
336 				   (nSubframe_Length << 8);
337 		if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
338 			netdev_warn(padapter->pnetdev, "r8712u: nRemain_Length is %d and nSubframe_Length is: %d\n",
339 				    a_len, nSubframe_Length);
340 			goto exit;
341 		}
342 		/* move the data point to data content */
343 		pdata += ETH_HLEN;
344 		a_len -= ETH_HLEN;
345 		/* Allocate new skb for releasing to upper layer */
346 		sub_skb = dev_alloc_skb(nSubframe_Length + 12);
347 		if (!sub_skb)
348 			break;
349 		skb_reserve(sub_skb, 12);
350 		skb_put_data(sub_skb, pdata, nSubframe_Length);
351 		subframes[nr_subframes++] = sub_skb;
352 		if (nr_subframes >= MAX_SUBFRAME_COUNT) {
353 			netdev_warn(padapter->pnetdev, "r8712u: ParseSubframe(): Too many Subframes! Packets dropped!\n");
354 			break;
355 		}
356 		pdata += nSubframe_Length;
357 		a_len -= nSubframe_Length;
358 		if (a_len != 0) {
359 			padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & 3);
360 			if (padding_len == 4)
361 				padding_len = 0;
362 			if (a_len < padding_len)
363 				goto exit;
364 			pdata += padding_len;
365 			a_len -= padding_len;
366 		}
367 	}
368 	for (i = 0; i < nr_subframes; i++) {
369 		sub_skb = subframes[i];
370 		/* convert hdr + possible LLC headers into Ethernet header */
371 		eth_type = (sub_skb->data[6] << 8) | sub_skb->data[7];
372 		if (sub_skb->len >= 8 &&
373 		    ((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) &&
374 		      eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
375 		     !memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE))) {
376 			/* remove RFC1042 or Bridge-Tunnel encapsulation and
377 			 * replace EtherType
378 			 */
379 			skb_pull(sub_skb, SNAP_SIZE);
380 			memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
381 			       ETH_ALEN);
382 			memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
383 			       ETH_ALEN);
384 		} else {
385 			__be16 len;
386 			/* Leave Ethernet header part of hdr and full payload */
387 			len = htons(sub_skb->len);
388 			memcpy(skb_push(sub_skb, 2), &len, 2);
389 			memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
390 			       ETH_ALEN);
391 			memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
392 			       ETH_ALEN);
393 		}
394 		/* Indicate the packets to upper layer */
395 		if (sub_skb) {
396 			sub_skb->protocol =
397 				 eth_type_trans(sub_skb, padapter->pnetdev);
398 			sub_skb->dev = padapter->pnetdev;
399 			if ((pattrib->tcpchk_valid == 1) &&
400 			    (pattrib->tcp_chkrpt == 1)) {
401 				sub_skb->ip_summed = CHECKSUM_UNNECESSARY;
402 			} else {
403 				sub_skb->ip_summed = CHECKSUM_NONE;
404 			}
405 			netif_rx(sub_skb);
406 		}
407 	}
408 exit:
409 	prframe->u.hdr.len = 0;
410 	r8712_free_recvframe(prframe, pfree_recv_queue);
411 }
412 
r8712_rxcmd_event_hdl(struct _adapter * padapter,void * prxcmdbuf)413 void r8712_rxcmd_event_hdl(struct _adapter *padapter, void *prxcmdbuf)
414 {
415 	__le32 voffset;
416 	u8 *poffset;
417 	u16 cmd_len, drvinfo_sz;
418 	struct recv_stat *prxstat;
419 
420 	poffset = prxcmdbuf;
421 	voffset = *(__le32 *)poffset;
422 	prxstat = prxcmdbuf;
423 	drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
424 	drvinfo_sz <<= 3;
425 	poffset += RXDESC_SIZE + drvinfo_sz;
426 	do {
427 		voffset  = *(__le32 *)poffset;
428 		cmd_len = (u16)(le32_to_cpu(voffset) & 0xffff);
429 		r8712_event_handle(padapter, (__le32 *)poffset);
430 		poffset += (cmd_len + 8);/*8 bytes alignment*/
431 	} while (le32_to_cpu(voffset) & BIT(31));
432 }
433 
check_indicate_seq(struct recv_reorder_ctrl * preorder_ctrl,u16 seq_num)434 static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl,
435 			      u16 seq_num)
436 {
437 	u8 wsize = preorder_ctrl->wsize_b;
438 	u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) % 4096;
439 
440 	/* Rx Reorder initialize condition.*/
441 	if (preorder_ctrl->indicate_seq == 0xffff)
442 		preorder_ctrl->indicate_seq = seq_num;
443 	/* Drop out the packet which SeqNum is smaller than WinStart */
444 	if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
445 		return false;
446 	/*
447 	 * Sliding window manipulation. Conditions includes:
448 	 * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
449 	 * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
450 	 */
451 	if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq))
452 		preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq +
453 					      1) % 4096;
454 	else if (SN_LESS(wend, seq_num)) {
455 		if (seq_num >= (wsize - 1))
456 			preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
457 		else
458 			preorder_ctrl->indicate_seq = 4095 - (wsize -
459 						      (seq_num + 1)) + 1;
460 	}
461 	return true;
462 }
463 
enqueue_reorder_recvframe(struct recv_reorder_ctrl * preorder_ctrl,union recv_frame * prframe)464 static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
465 				     union recv_frame *prframe)
466 {
467 	struct list_head *phead, *plist;
468 	union recv_frame *pnextrframe;
469 	struct rx_pkt_attrib *pnextattrib;
470 	struct  __queue *ppending_recvframe_queue =
471 					&preorder_ctrl->pending_recvframe_queue;
472 	struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
473 
474 	phead = &ppending_recvframe_queue->queue;
475 	plist = phead->next;
476 	while (!end_of_queue_search(phead, plist)) {
477 		pnextrframe = container_of(plist, union recv_frame, u.list);
478 		pnextattrib = &pnextrframe->u.hdr.attrib;
479 
480 		if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
481 			return false;
482 
483 		if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
484 			plist = plist->next;
485 		else
486 			break;
487 	}
488 	list_del_init(&prframe->u.hdr.list);
489 	list_add_tail(&prframe->u.hdr.list, plist);
490 	return true;
491 }
492 
r8712_recv_indicatepkts_in_order(struct _adapter * padapter,struct recv_reorder_ctrl * preorder_ctrl,int bforced)493 int r8712_recv_indicatepkts_in_order(struct _adapter *padapter,
494 				     struct recv_reorder_ctrl *preorder_ctrl,
495 				     int bforced)
496 {
497 	struct list_head *phead, *plist;
498 	union recv_frame *prframe;
499 	struct rx_pkt_attrib *pattrib;
500 	int bPktInBuf = false;
501 	struct  __queue *ppending_recvframe_queue =
502 			 &preorder_ctrl->pending_recvframe_queue;
503 
504 	phead = &ppending_recvframe_queue->queue;
505 	plist = phead->next;
506 	/* Handling some condition for forced indicate case.*/
507 	if (bforced) {
508 		if (list_empty(phead))
509 			return true;
510 
511 		prframe = container_of(plist, union recv_frame, u.list);
512 		pattrib = &prframe->u.hdr.attrib;
513 		preorder_ctrl->indicate_seq = pattrib->seq_num;
514 	}
515 	/* Prepare indication list and indication.
516 	 * Check if there is any packet need indicate.
517 	 */
518 	while (!list_empty(phead)) {
519 		prframe = container_of(plist, union recv_frame, u.list);
520 		pattrib = &prframe->u.hdr.attrib;
521 		if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
522 			plist = plist->next;
523 			list_del_init(&prframe->u.hdr.list);
524 			if (SN_EQUAL(preorder_ctrl->indicate_seq,
525 				     pattrib->seq_num))
526 				preorder_ctrl->indicate_seq =
527 				  (preorder_ctrl->indicate_seq + 1) % 4096;
528 			/*indicate this recv_frame*/
529 			if (!pattrib->amsdu) {
530 				if (!padapter->driver_stopped &&
531 				    !padapter->surprise_removed) {
532 					/* indicate this recv_frame */
533 					r8712_recv_indicatepkt(padapter,
534 							       prframe);
535 				}
536 			} else if (pattrib->amsdu == 1) {
537 				amsdu_to_msdu(padapter, prframe);
538 			}
539 			/* Update local variables. */
540 			bPktInBuf = false;
541 		} else {
542 			bPktInBuf = true;
543 			break;
544 		}
545 	}
546 	return bPktInBuf;
547 }
548 
recv_indicatepkt_reorder(struct _adapter * padapter,union recv_frame * prframe)549 static int recv_indicatepkt_reorder(struct _adapter *padapter,
550 				    union recv_frame *prframe)
551 {
552 	unsigned long irql;
553 	struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
554 	struct recv_reorder_ctrl *preorder_ctrl = prframe->u.hdr.preorder_ctrl;
555 	struct  __queue *ppending_recvframe_queue =
556 			 &preorder_ctrl->pending_recvframe_queue;
557 
558 	if (!pattrib->amsdu) {
559 		/* s1. */
560 		r8712_wlanhdr_to_ethhdr(prframe);
561 		if (pattrib->qos != 1) {
562 			if (!padapter->driver_stopped &&
563 			    !padapter->surprise_removed) {
564 				r8712_recv_indicatepkt(padapter, prframe);
565 				return 0;
566 			} else {
567 				return -EINVAL;
568 			}
569 		}
570 	}
571 	spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
572 	/*s2. check if winstart_b(indicate_seq) needs to be updated*/
573 	if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num))
574 		goto _err_exit;
575 	/*s3. Insert all packet into Reorder Queue to maintain its ordering.*/
576 	if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
577 		goto _err_exit;
578 	/*s4.
579 	 * Indication process.
580 	 * After Packet dropping and Sliding Window shifting as above, we can
581 	 * now just indicate the packets with the SeqNum smaller than latest
582 	 * WinStart and buffer other packets.
583 	 *
584 	 * For Rx Reorder condition:
585 	 * 1. All packets with SeqNum smaller than WinStart => Indicate
586 	 * 2. All packets with SeqNum larger than or equal to
587 	 * WinStart => Buffer it.
588 	 */
589 	if (r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, false)) {
590 		mod_timer(&preorder_ctrl->reordering_ctrl_timer,
591 			  jiffies + msecs_to_jiffies(REORDER_WAIT_TIME));
592 		spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
593 	} else {
594 		spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
595 		del_timer(&preorder_ctrl->reordering_ctrl_timer);
596 	}
597 	return 0;
598 _err_exit:
599 	spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
600 	return -ENOMEM;
601 }
602 
r8712_reordering_ctrl_timeout_handler(void * pcontext)603 void r8712_reordering_ctrl_timeout_handler(void *pcontext)
604 {
605 	unsigned long irql;
606 	struct recv_reorder_ctrl *preorder_ctrl = pcontext;
607 	struct _adapter *padapter = preorder_ctrl->padapter;
608 	struct  __queue *ppending_recvframe_queue =
609 				 &preorder_ctrl->pending_recvframe_queue;
610 
611 	if (padapter->driver_stopped || padapter->surprise_removed)
612 		return;
613 	spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
614 	r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, true);
615 	spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
616 }
617 
r8712_process_recv_indicatepkts(struct _adapter * padapter,union recv_frame * prframe)618 static int r8712_process_recv_indicatepkts(struct _adapter *padapter,
619 					   union recv_frame *prframe)
620 {
621 	int retval = _SUCCESS;
622 	struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
623 	struct ht_priv	*phtpriv = &pmlmepriv->htpriv;
624 
625 	if (phtpriv->ht_option == 1) { /*B/G/N Mode*/
626 		if (recv_indicatepkt_reorder(padapter, prframe)) {
627 			/* including perform A-MPDU Rx Ordering Buffer Control*/
628 			if (!padapter->driver_stopped &&
629 			    !padapter->surprise_removed)
630 				return _FAIL;
631 		}
632 	} else { /*B/G mode*/
633 		retval = r8712_wlanhdr_to_ethhdr(prframe);
634 		if (retval)
635 			return _FAIL;
636 		if (!padapter->driver_stopped && !padapter->surprise_removed) {
637 			/* indicate this recv_frame */
638 			r8712_recv_indicatepkt(padapter, prframe);
639 		} else {
640 			return _FAIL;
641 		}
642 	}
643 	return retval;
644 }
645 
query_rx_pwr_percentage(s8 antpower)646 static u8 query_rx_pwr_percentage(s8 antpower)
647 {
648 	if ((antpower <= -100) || (antpower >= 20))
649 		return	0;
650 	else if (antpower >= 0)
651 		return	100;
652 	else
653 		return 100 + antpower;
654 }
655 
evm_db2percentage(s8 value)656 static u8 evm_db2percentage(s8 value)
657 {
658 	/*
659 	 * -33dB~0dB to 0%~99%
660 	 */
661 	s8 ret_val = clamp(-value, 0, 33) * 3;
662 
663 	if (ret_val == 99)
664 		ret_val = 100;
665 
666 	return ret_val;
667 }
668 
r8712_signal_scale_mapping(s32 cur_sig)669 s32 r8712_signal_scale_mapping(s32 cur_sig)
670 {
671 	s32 ret_sig;
672 
673 	if (cur_sig >= 51 && cur_sig <= 100)
674 		ret_sig = 100;
675 	else if (cur_sig >= 41 && cur_sig <= 50)
676 		ret_sig = 80 + ((cur_sig - 40) * 2);
677 	else if (cur_sig >= 31 && cur_sig <= 40)
678 		ret_sig = 66 + (cur_sig - 30);
679 	else if (cur_sig >= 21 && cur_sig <= 30)
680 		ret_sig = 54 + (cur_sig - 20);
681 	else if (cur_sig >= 10 && cur_sig <= 20)
682 		ret_sig = 42 + (((cur_sig - 10) * 2) / 3);
683 	else if (cur_sig >= 5 && cur_sig <= 9)
684 		ret_sig = 22 + (((cur_sig - 5) * 3) / 2);
685 	else if (cur_sig >= 1 && cur_sig <= 4)
686 		ret_sig = 6 + (((cur_sig - 1) * 3) / 2);
687 	else
688 		ret_sig = cur_sig;
689 	return ret_sig;
690 }
691 
translate2dbm(struct _adapter * padapter,u8 signal_strength_idx)692 static s32  translate2dbm(struct _adapter *padapter, u8 signal_strength_idx)
693 {
694 	s32 signal_power; /* in dBm.*/
695 	/* Translate to dBm (x=0.5y-95).*/
696 	signal_power = (s32)((signal_strength_idx + 1) >> 1);
697 	signal_power -= 95;
698 	return signal_power;
699 }
700 
query_rx_phy_status(struct _adapter * padapter,union recv_frame * prframe)701 static void query_rx_phy_status(struct _adapter *padapter,
702 				union recv_frame *prframe)
703 {
704 	u8 i, max_spatial_stream, evm;
705 	struct recv_stat *prxstat = (struct recv_stat *)prframe->u.hdr.rx_head;
706 	struct phy_stat *pphy_stat = (struct phy_stat *)(prxstat + 1);
707 	u8 *pphy_head = (u8 *)(prxstat + 1);
708 	s8 rx_pwr[4], rx_pwr_all;
709 	u8 pwdb_all;
710 	u32 rssi, total_rssi = 0;
711 	u8 bcck_rate = 0, rf_rx_num = 0, cck_highpwr = 0;
712 	struct phy_cck_rx_status *pcck_buf;
713 	u8 sq;
714 
715 	/* Record it for next packet processing*/
716 	bcck_rate = (prframe->u.hdr.attrib.mcs_rate <= 3 ? 1 : 0);
717 	if (bcck_rate) {
718 		u8 report;
719 
720 		/* CCK Driver info Structure is not the same as OFDM packet.*/
721 		pcck_buf = (struct phy_cck_rx_status *)pphy_stat;
722 		/* (1)Hardware does not provide RSSI for CCK
723 		 * (2)PWDB, Average PWDB calculated by hardware
724 		 * (for rate adaptive)
725 		 */
726 		if (!cck_highpwr) {
727 			report = pcck_buf->cck_agc_rpt & 0xc0;
728 			report >>= 6;
729 			switch (report) {
730 			/* Modify the RF RNA gain value to -40, -20,
731 			 * -2, 14 by Jenyu's suggestion
732 			 * Note: different RF with the different
733 			 * RNA gain.
734 			 */
735 			case 0x3:
736 				rx_pwr_all = -40 - (pcck_buf->cck_agc_rpt &
737 					     0x3e);
738 				break;
739 			case 0x2:
740 				rx_pwr_all = -20 - (pcck_buf->cck_agc_rpt &
741 					     0x3e);
742 				break;
743 			case 0x1:
744 				rx_pwr_all = -2 - (pcck_buf->cck_agc_rpt &
745 					     0x3e);
746 				break;
747 			case 0x0:
748 				rx_pwr_all = 14 - (pcck_buf->cck_agc_rpt &
749 					     0x3e);
750 				break;
751 			}
752 		} else {
753 			report = ((u8)(le32_to_cpu(pphy_stat->phydw1) >> 8)) &
754 				 0x60;
755 			report >>= 5;
756 			switch (report) {
757 			case 0x3:
758 				rx_pwr_all = -40 - ((pcck_buf->cck_agc_rpt &
759 					     0x1f) << 1);
760 				break;
761 			case 0x2:
762 				rx_pwr_all = -20 - ((pcck_buf->cck_agc_rpt &
763 					     0x1f) << 1);
764 				break;
765 			case 0x1:
766 				rx_pwr_all = -2 - ((pcck_buf->cck_agc_rpt &
767 					     0x1f) << 1);
768 				break;
769 			case 0x0:
770 				rx_pwr_all = 14 - ((pcck_buf->cck_agc_rpt &
771 					     0x1f) << 1);
772 				break;
773 			}
774 		}
775 		pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
776 		/* CCK gain is smaller than OFDM/MCS gain,*/
777 		/* so we add gain diff by experiences, the val is 6 */
778 		pwdb_all += 6;
779 		if (pwdb_all > 100)
780 			pwdb_all = 100;
781 		/* modify the offset to make the same gain index with OFDM.*/
782 		if (pwdb_all > 34 && pwdb_all <= 42)
783 			pwdb_all -= 2;
784 		else if (pwdb_all > 26 && pwdb_all <= 34)
785 			pwdb_all -= 6;
786 		else if (pwdb_all > 14 && pwdb_all <= 26)
787 			pwdb_all -= 8;
788 		else if (pwdb_all > 4 && pwdb_all <= 14)
789 			pwdb_all -= 4;
790 		/*
791 		 * (3) Get Signal Quality (EVM)
792 		 */
793 		if (pwdb_all > 40) {
794 			sq = 100;
795 		} else {
796 			sq = pcck_buf->sq_rpt;
797 			if (pcck_buf->sq_rpt > 64)
798 				sq = 0;
799 			else if (pcck_buf->sq_rpt < 20)
800 				sq = 100;
801 			else
802 				sq = ((64 - sq) * 100) / 44;
803 		}
804 		prframe->u.hdr.attrib.signal_qual = sq;
805 		prframe->u.hdr.attrib.rx_mimo_signal_qual[0] = sq;
806 		prframe->u.hdr.attrib.rx_mimo_signal_qual[1] = -1;
807 	} else {
808 		/* (1)Get RSSI for HT rate */
809 		for (i = 0; i < ((padapter->registrypriv.rf_config) &
810 			    0x0f); i++) {
811 			rf_rx_num++;
812 			rx_pwr[i] = ((pphy_head[PHY_STAT_GAIN_TRSW_SHT + i]
813 				    & 0x3F) * 2) - 110;
814 			/* Translate DBM to percentage. */
815 			rssi = query_rx_pwr_percentage(rx_pwr[i]);
816 			total_rssi += rssi;
817 		}
818 		/* (2)PWDB, Average PWDB calculated by hardware (for
819 		 * rate adaptive)
820 		 */
821 		rx_pwr_all = (((pphy_head[PHY_STAT_PWDB_ALL_SHT]) >> 1) & 0x7f)
822 			     - 106;
823 		pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
824 
825 		{
826 			/* (3)EVM of HT rate */
827 			if (prframe->u.hdr.attrib.htc &&
828 			    prframe->u.hdr.attrib.mcs_rate >= 20 &&
829 			    prframe->u.hdr.attrib.mcs_rate <= 27) {
830 				/* both spatial stream make sense */
831 				max_spatial_stream = 2;
832 			} else {
833 				/* only spatial stream 1 makes sense */
834 				max_spatial_stream = 1;
835 			}
836 			for (i = 0; i < max_spatial_stream; i++) {
837 				evm = evm_db2percentage((pphy_head
838 				      [PHY_STAT_RXEVM_SHT + i]));/*dbm*/
839 				prframe->u.hdr.attrib.signal_qual =
840 					 (u8)(evm & 0xff);
841 				prframe->u.hdr.attrib.rx_mimo_signal_qual[i] =
842 					 (u8)(evm & 0xff);
843 			}
844 		}
845 	}
846 	/* UI BSS List signal strength(in percentage), make it good looking,
847 	 * from 0~100. It is assigned to the BSS List in
848 	 * GetValueFromBeaconOrProbeRsp().
849 	 */
850 	if (bcck_rate) {
851 		prframe->u.hdr.attrib.signal_strength =
852 			 (u8)r8712_signal_scale_mapping(pwdb_all);
853 	} else {
854 		if (rf_rx_num != 0)
855 			prframe->u.hdr.attrib.signal_strength =
856 				 (u8)(r8712_signal_scale_mapping(total_rssi /=
857 				 rf_rx_num));
858 	}
859 }
860 
process_link_qual(struct _adapter * padapter,union recv_frame * prframe)861 static void process_link_qual(struct _adapter *padapter,
862 			      union recv_frame *prframe)
863 {
864 	u32	last_evm = 0, tmpVal;
865 	struct rx_pkt_attrib *pattrib;
866 	struct smooth_rssi_data *sqd = &padapter->recvpriv.signal_qual_data;
867 
868 	if (!prframe || !padapter)
869 		return;
870 	pattrib = &prframe->u.hdr.attrib;
871 	if (pattrib->signal_qual != 0) {
872 		/*
873 		 * 1. Record the general EVM to the sliding window.
874 		 */
875 		if (sqd->total_num++ >= PHY_LINKQUALITY_SLID_WIN_MAX) {
876 			sqd->total_num = PHY_LINKQUALITY_SLID_WIN_MAX;
877 			last_evm = sqd->elements[sqd->index];
878 			sqd->total_val -= last_evm;
879 		}
880 		sqd->total_val += pattrib->signal_qual;
881 		sqd->elements[sqd->index++] = pattrib->signal_qual;
882 		if (sqd->index >= PHY_LINKQUALITY_SLID_WIN_MAX)
883 			sqd->index = 0;
884 
885 		/* <1> Showed on UI for user, in percentage. */
886 		tmpVal = sqd->total_val / sqd->total_num;
887 		padapter->recvpriv.signal = (u8)tmpVal;
888 	}
889 }
890 
process_rssi(struct _adapter * padapter,union recv_frame * prframe)891 static void process_rssi(struct _adapter *padapter, union recv_frame *prframe)
892 {
893 	u32 last_rssi, tmp_val;
894 	struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
895 	struct smooth_rssi_data *ssd = &padapter->recvpriv.signal_strength_data;
896 
897 	if (ssd->total_num++ >= PHY_RSSI_SLID_WIN_MAX) {
898 		ssd->total_num = PHY_RSSI_SLID_WIN_MAX;
899 		last_rssi = ssd->elements[ssd->index];
900 		ssd->total_val -= last_rssi;
901 	}
902 	ssd->total_val += pattrib->signal_strength;
903 	ssd->elements[ssd->index++] = pattrib->signal_strength;
904 	if (ssd->index >= PHY_RSSI_SLID_WIN_MAX)
905 		ssd->index = 0;
906 	tmp_val = ssd->total_val / ssd->total_num;
907 	padapter->recvpriv.rssi = (s8)translate2dbm(padapter, (u8)tmp_val);
908 }
909 
process_phy_info(struct _adapter * padapter,union recv_frame * prframe)910 static void process_phy_info(struct _adapter *padapter,
911 			     union recv_frame *prframe)
912 {
913 	query_rx_phy_status(padapter, prframe);
914 	process_rssi(padapter, prframe);
915 	process_link_qual(padapter,  prframe);
916 }
917 
recv_func(struct _adapter * padapter,void * pcontext)918 int recv_func(struct _adapter *padapter, void *pcontext)
919 {
920 	struct rx_pkt_attrib *pattrib;
921 	union recv_frame *prframe, *orig_prframe;
922 	int retval = _SUCCESS;
923 	struct  __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
924 	struct	mlme_priv	*pmlmepriv = &padapter->mlmepriv;
925 
926 	prframe = pcontext;
927 	orig_prframe = prframe;
928 	pattrib = &prframe->u.hdr.attrib;
929 	if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
930 		if (pattrib->crc_err == 1)
931 			padapter->mppriv.rx_crcerrpktcount++;
932 		else
933 			padapter->mppriv.rx_pktcount++;
934 		if (!check_fwstate(pmlmepriv, WIFI_MP_LPBK_STATE)) {
935 			/* free this recv_frame */
936 			r8712_free_recvframe(orig_prframe, pfree_recv_queue);
937 			goto _exit_recv_func;
938 		}
939 	}
940 	/* check the frame crtl field and decache */
941 	retval = r8712_validate_recv_frame(padapter, prframe);
942 	if (retval != _SUCCESS) {
943 		/* free this recv_frame */
944 		r8712_free_recvframe(orig_prframe, pfree_recv_queue);
945 		goto _exit_recv_func;
946 	}
947 	process_phy_info(padapter, prframe);
948 	prframe = r8712_decryptor(padapter, prframe);
949 	if (!prframe) {
950 		retval = _FAIL;
951 		goto _exit_recv_func;
952 	}
953 	prframe = r8712_recvframe_chk_defrag(padapter, prframe);
954 	if (!prframe)
955 		goto _exit_recv_func;
956 	prframe = r8712_portctrl(padapter, prframe);
957 	if (!prframe) {
958 		retval = _FAIL;
959 		goto _exit_recv_func;
960 	}
961 	retval = r8712_process_recv_indicatepkts(padapter, prframe);
962 	if (retval != _SUCCESS) {
963 		r8712_free_recvframe(orig_prframe, pfree_recv_queue);
964 		goto _exit_recv_func;
965 	}
966 _exit_recv_func:
967 	return retval;
968 }
969 
recvbuf2recvframe(struct _adapter * padapter,struct sk_buff * pskb)970 static void recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
971 {
972 	u8 *pbuf, shift_sz = 0;
973 	u8	frag, mf;
974 	uint	pkt_len;
975 	u32 transfer_len;
976 	struct recv_stat *prxstat;
977 	u16	pkt_cnt, drvinfo_sz, pkt_offset, tmp_len, alloc_sz;
978 	struct  __queue *pfree_recv_queue;
979 	_pkt  *pkt_copy = NULL;
980 	union recv_frame *precvframe = NULL;
981 	struct recv_priv *precvpriv = &padapter->recvpriv;
982 
983 	pfree_recv_queue = &precvpriv->free_recv_queue;
984 	pbuf = pskb->data;
985 	prxstat = (struct recv_stat *)pbuf;
986 	pkt_cnt = (le32_to_cpu(prxstat->rxdw2) >> 16) & 0xff;
987 	pkt_len =  le32_to_cpu(prxstat->rxdw0) & 0x00003fff;
988 	transfer_len = pskb->len;
989 	/* Test throughput with Netgear 3700 (No security) with Chariot 3T3R
990 	 * pairs. The packet count will be a big number so that the containing
991 	 * packet will effect the Rx reordering.
992 	 */
993 	if (transfer_len < pkt_len) {
994 		/* In this case, it means the MAX_RECVBUF_SZ is too small to
995 		 * get the data from 8712u.
996 		 */
997 		return;
998 	}
999 	do {
1000 		prxstat = (struct recv_stat *)pbuf;
1001 		pkt_len =  le32_to_cpu(prxstat->rxdw0) & 0x00003fff;
1002 		/* more fragment bit */
1003 		mf = (le32_to_cpu(prxstat->rxdw1) >> 27) & 0x1;
1004 		/* ragmentation number */
1005 		frag = (le32_to_cpu(prxstat->rxdw2) >> 12) & 0xf;
1006 		/* uint 2^3 = 8 bytes */
1007 		drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
1008 		drvinfo_sz <<= 3;
1009 		if (pkt_len <= 0)
1010 			return;
1011 		/* Qos data, wireless lan header length is 26 */
1012 		if ((le32_to_cpu(prxstat->rxdw0) >> 23) & 0x01)
1013 			shift_sz = 2;
1014 		precvframe = r8712_alloc_recvframe(pfree_recv_queue);
1015 		if (!precvframe)
1016 			return;
1017 		INIT_LIST_HEAD(&precvframe->u.hdr.list);
1018 		precvframe->u.hdr.precvbuf = NULL; /*can't access the precvbuf*/
1019 		precvframe->u.hdr.len = 0;
1020 		tmp_len = pkt_len + drvinfo_sz + RXDESC_SIZE;
1021 		pkt_offset = (u16)round_up(tmp_len, 128);
1022 		/* for first fragment packet, driver need allocate 1536 +
1023 		 * drvinfo_sz + RXDESC_SIZE to defrag packet.
1024 		 */
1025 		if ((mf == 1) && (frag == 0))
1026 			/*1658+6=1664, 1664 is 128 alignment.*/
1027 			alloc_sz = max_t(u16, tmp_len, 1658);
1028 		else
1029 			alloc_sz = tmp_len;
1030 		/* 2 is for IP header 4 bytes alignment in QoS packet case.
1031 		 * 4 is for skb->data 4 bytes alignment.
1032 		 */
1033 		alloc_sz += 6;
1034 		pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz);
1035 		if (!pkt_copy)
1036 			return;
1037 
1038 		precvframe->u.hdr.pkt = pkt_copy;
1039 		skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data) % 4));
1040 		skb_reserve(pkt_copy, shift_sz);
1041 		memcpy(pkt_copy->data, pbuf, tmp_len);
1042 		precvframe->u.hdr.rx_head = pkt_copy->data;
1043 		precvframe->u.hdr.rx_data = pkt_copy->data;
1044 		precvframe->u.hdr.rx_tail = pkt_copy->data;
1045 		precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
1046 
1047 		recvframe_put(precvframe, tmp_len);
1048 		recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE);
1049 		/* because the endian issue, driver avoid reference to the
1050 		 * rxstat after calling update_recvframe_attrib_from_recvstat();
1051 		 */
1052 		update_recvframe_attrib_from_recvstat(&precvframe->u.hdr.attrib,
1053 						      prxstat);
1054 		r8712_recv_entry(precvframe);
1055 		transfer_len -= pkt_offset;
1056 		pbuf += pkt_offset;
1057 		pkt_cnt--;
1058 		precvframe = NULL;
1059 		pkt_copy = NULL;
1060 	} while ((transfer_len > 0) && pkt_cnt > 0);
1061 }
1062 
recv_tasklet(struct tasklet_struct * t)1063 static void recv_tasklet(struct tasklet_struct *t)
1064 {
1065 	struct sk_buff *pskb;
1066 	struct _adapter *padapter = from_tasklet(padapter, t,
1067 						 recvpriv.recv_tasklet);
1068 	struct recv_priv *precvpriv = &padapter->recvpriv;
1069 
1070 	while (NULL != (pskb = skb_dequeue(&precvpriv->rx_skb_queue))) {
1071 		recvbuf2recvframe(padapter, pskb);
1072 		skb_reset_tail_pointer(pskb);
1073 		pskb->len = 0;
1074 		if (!skb_cloned(pskb))
1075 			skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
1076 		else
1077 			consume_skb(pskb);
1078 	}
1079 }
1080