1 /******************************************************************************
4 * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
5 * Linux device driver for RTL8192SU
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.
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
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
20 * Modifications for inclusion into the Linux staging tree are
21 * Copyright(c) 2010 Larry Finger. All rights reserved.
23 * Contact information:
24 * WLAN FAE <wlanfae@realtek.com>
25 * Larry Finger <Larry.Finger@lwfinger.net>
27 ******************************************************************************/
29 #define _RTL8712_RECV_C_
31 #include <linux/if_ether.h>
34 #include "osdep_service.h"
35 #include "drv_types.h"
36 #include "recv_osdep.h"
37 #include "mlme_osdep.h"
42 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
43 static u8 bridge_tunnel_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8};
45 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
46 static u8 rfc1042_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
48 static void recv_tasklet(void *priv);
50 int r8712_init_recv_priv(struct recv_priv *precvpriv, struct _adapter *padapter)
53 struct recv_buf *precvbuf;
57 struct sk_buff *pskb = NULL;
60 _init_queue(&precvpriv->free_recv_buf_queue);
61 precvpriv->pallocated_recv_buf = kzalloc(NR_RECVBUFF * sizeof(struct recv_buf) + 4,
63 if (precvpriv->pallocated_recv_buf == NULL)
65 precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 -
66 ((addr_t) (precvpriv->pallocated_recv_buf) & 3);
67 precvbuf = (struct recv_buf *)precvpriv->precv_buf;
68 for (i = 0; i < NR_RECVBUFF; i++) {
69 _init_listhead(&precvbuf->list);
70 spin_lock_init(&precvbuf->recvbuf_lock);
71 res = r8712_os_recvbuf_resource_alloc(padapter, precvbuf);
74 precvbuf->ref_cnt = 0;
75 precvbuf->adapter = padapter;
76 list_insert_tail(&precvbuf->list,
77 &(precvpriv->free_recv_buf_queue.queue));
80 precvpriv->free_recv_buf_queue_cnt = NR_RECVBUFF;
81 tasklet_init(&precvpriv->recv_tasklet,
82 (void(*)(unsigned long))recv_tasklet,
83 (unsigned long)padapter);
84 skb_queue_head_init(&precvpriv->rx_skb_queue);
86 skb_queue_head_init(&precvpriv->free_recv_skb_queue);
87 for (i = 0; i < NR_PREALLOC_RECV_SKB; i++) {
88 pskb = netdev_alloc_skb(padapter->pnetdev, MAX_RECVBUF_SZ +
91 tmpaddr = (addr_t)pskb->data;
92 alignment = tmpaddr & (RECVBUFF_ALIGN_SZ-1);
93 skb_reserve(pskb, (RECVBUFF_ALIGN_SZ - alignment));
94 skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
101 void r8712_free_recv_priv(struct recv_priv *precvpriv)
104 struct recv_buf *precvbuf;
105 struct _adapter *padapter = precvpriv->adapter;
107 precvbuf = (struct recv_buf *)precvpriv->precv_buf;
108 for (i = 0; i < NR_RECVBUFF; i++) {
109 r8712_os_recvbuf_resource_free(padapter, precvbuf);
112 kfree(precvpriv->pallocated_recv_buf);
113 skb_queue_purge(&precvpriv->rx_skb_queue);
114 if (skb_queue_len(&precvpriv->rx_skb_queue))
115 netdev_warn(padapter->pnetdev, "r8712u: rx_skb_queue not empty\n");
116 skb_queue_purge(&precvpriv->free_recv_skb_queue);
117 if (skb_queue_len(&precvpriv->free_recv_skb_queue))
118 netdev_warn(padapter->pnetdev, "r8712u: free_recv_skb_queue not empty %d\n",
119 skb_queue_len(&precvpriv->free_recv_skb_queue));
122 int r8712_init_recvbuf(struct _adapter *padapter, struct recv_buf *precvbuf)
124 precvbuf->transfer_len = 0;
126 precvbuf->ref_cnt = 0;
127 if (precvbuf->pbuf) {
128 precvbuf->pdata = precvbuf->pbuf;
129 precvbuf->phead = precvbuf->pbuf;
130 precvbuf->ptail = precvbuf->pbuf;
131 precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ;
136 int r8712_free_recvframe(union recv_frame *precvframe,
137 struct __queue *pfree_recv_queue)
140 struct _adapter *padapter = precvframe->u.hdr.adapter;
141 struct recv_priv *precvpriv = &padapter->recvpriv;
143 if (precvframe->u.hdr.pkt) {
144 dev_kfree_skb_any(precvframe->u.hdr.pkt);/*free skb by driver*/
145 precvframe->u.hdr.pkt = NULL;
147 spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
148 list_delete(&(precvframe->u.hdr.list));
149 list_insert_tail(&(precvframe->u.hdr.list),
150 get_list_head(pfree_recv_queue));
151 if (padapter != NULL) {
152 if (pfree_recv_queue == &precvpriv->free_recv_queue)
153 precvpriv->free_recvframe_cnt++;
155 spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
159 static void update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib *pattrib,
160 struct recv_stat *prxstat)
163 struct phy_stat *pphy_stat;
166 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0)&0x000f0000)>>16;
167 drvinfo_sz = drvinfo_sz<<3;
170 pattrib->bdecrypted = ((le32_to_cpu(prxstat->rxdw0) & BIT(27)) >> 27)
172 pattrib->crc_err = ((le32_to_cpu(prxstat->rxdw0) & BIT(14)) >> 14);
176 if (le32_to_cpu(prxstat->rxdw3) & BIT(13)) {
177 pattrib->tcpchk_valid = 1; /* valid */
178 if (le32_to_cpu(prxstat->rxdw3) & BIT(11))
179 pattrib->tcp_chkrpt = 1; /* correct */
181 pattrib->tcp_chkrpt = 0; /* incorrect */
182 if (le32_to_cpu(prxstat->rxdw3) & BIT(12))
183 pattrib->ip_chkrpt = 1; /* correct */
185 pattrib->ip_chkrpt = 0; /* incorrect */
187 pattrib->tcpchk_valid = 0; /* invalid */
188 pattrib->mcs_rate = (u8)((le32_to_cpu(prxstat->rxdw3)) & 0x3f);
189 pattrib->htc = (u8)((le32_to_cpu(prxstat->rxdw3) >> 14) & 0x1);
194 pphy_stat = (struct phy_stat *)(prxstat+1);
195 pphy_info = (u32 *)prxstat+1;
200 static union recv_frame *recvframe_defrag(struct _adapter *adapter,
201 struct __queue *defrag_q)
203 struct list_head *plist, *phead;
204 u8 *data, wlanhdr_offset;
206 struct recv_frame_hdr *pfhdr, *pnfhdr;
207 union recv_frame *prframe, *pnextrframe;
208 struct __queue *pfree_recv_queue;
210 pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
211 phead = get_list_head(defrag_q);
212 plist = get_next(phead);
213 prframe = LIST_CONTAINOR(plist, union recv_frame, u);
214 list_delete(&prframe->u.list);
215 pfhdr = &prframe->u.hdr;
217 if (curfragnum != pfhdr->attrib.frag_num) {
218 /*the first fragment number must be 0
219 *free the whole queue*/
220 r8712_free_recvframe(prframe, pfree_recv_queue);
221 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
225 plist = get_list_head(defrag_q);
226 plist = get_next(plist);
227 data = get_recvframe_data(prframe);
228 while (end_of_queue_search(phead, plist) == false) {
229 pnextrframe = LIST_CONTAINOR(plist, union recv_frame, u);
230 pnfhdr = &pnextrframe->u.hdr;
231 /*check the fragment sequence (2nd ~n fragment frame) */
232 if (curfragnum != pnfhdr->attrib.frag_num) {
233 /* the fragment number must increase (after decache)
234 * release the defrag_q & prframe */
235 r8712_free_recvframe(prframe, pfree_recv_queue);
236 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
240 /* copy the 2nd~n fragment frame's payload to the first fragment
241 * get the 2nd~last fragment frame's payload */
242 wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;
243 recvframe_pull(pnextrframe, wlanhdr_offset);
244 /* append to first fragment frame's tail (if privacy frame,
246 recvframe_pull_tail(prframe, pfhdr->attrib.icv_len);
247 memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len);
248 recvframe_put(prframe, pnfhdr->len);
249 pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
250 plist = get_next(plist);
252 /* free the defrag_q queue and return the prframe */
253 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
257 /* check if need to defrag, if needed queue the frame to defrag_q */
258 union recv_frame *r8712_recvframe_chk_defrag(struct _adapter *padapter,
259 union recv_frame *precv_frame)
264 struct recv_frame_hdr *pfhdr;
265 struct sta_info *psta;
266 struct sta_priv *pstapriv;
267 struct list_head *phead;
268 union recv_frame *prtnframe = NULL;
269 struct __queue *pfree_recv_queue, *pdefrag_q;
271 pstapriv = &padapter->stapriv;
272 pfhdr = &precv_frame->u.hdr;
273 pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
274 /* need to define struct of wlan header frame ctrl */
275 ismfrag = pfhdr->attrib.mfrag;
276 fragnum = pfhdr->attrib.frag_num;
277 psta_addr = pfhdr->attrib.ta;
278 psta = r8712_get_stainfo(pstapriv, psta_addr);
282 pdefrag_q = &psta->sta_recvpriv.defrag_q;
284 if ((ismfrag == 0) && (fragnum == 0))
285 prtnframe = precv_frame;/*isn't a fragment frame*/
287 /* 0~(n-1) fragment frame
288 * enqueue to defraf_g */
289 if (pdefrag_q != NULL) {
291 /*the first fragment*/
292 if (_queue_empty(pdefrag_q) == false) {
293 /*free current defrag_q */
294 r8712_free_recvframe_queue(pdefrag_q,
298 /* Then enqueue the 0~(n-1) fragment to the defrag_q */
299 phead = get_list_head(pdefrag_q);
300 list_insert_tail(&pfhdr->list, phead);
303 /* can't find this ta's defrag_queue, so free this
305 r8712_free_recvframe(precv_frame, pfree_recv_queue);
310 if ((ismfrag == 0) && (fragnum != 0)) {
311 /* the last fragment frame
312 * enqueue the last fragment */
313 if (pdefrag_q != NULL) {
314 phead = get_list_head(pdefrag_q);
315 list_insert_tail(&pfhdr->list, phead);
316 /*call recvframe_defrag to defrag*/
317 precv_frame = recvframe_defrag(padapter, pdefrag_q);
318 prtnframe = precv_frame;
320 /* can't find this ta's defrag_queue, so free this
322 r8712_free_recvframe(precv_frame, pfree_recv_queue);
326 if ((prtnframe != NULL) && (prtnframe->u.hdr.attrib.privacy)) {
327 /* after defrag we must check tkip mic code */
328 if (r8712_recvframe_chkmic(padapter, prtnframe) == _FAIL) {
329 r8712_free_recvframe(prtnframe, pfree_recv_queue);
336 static int amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe)
338 int a_len, padding_len;
339 u16 eth_type, nSubframe_Length;
341 unsigned char *data_ptr, *pdata;
342 struct rx_pkt_attrib *pattrib;
343 _pkt *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
344 struct recv_priv *precvpriv = &padapter->recvpriv;
345 struct __queue *pfree_recv_queue = &(precvpriv->free_recv_queue);
348 pattrib = &prframe->u.hdr.attrib;
349 recvframe_pull(prframe, prframe->u.hdr.attrib.hdrlen);
350 if (prframe->u.hdr.attrib.iv_len > 0)
351 recvframe_pull(prframe, prframe->u.hdr.attrib.iv_len);
352 a_len = prframe->u.hdr.len;
353 pdata = prframe->u.hdr.rx_data;
354 while (a_len > ETH_HLEN) {
355 /* Offset 12 denote 2 mac address */
356 nSubframe_Length = *((u16 *)(pdata + 12));
357 /*==m==>change the length order*/
358 nSubframe_Length = (nSubframe_Length >> 8) +
359 (nSubframe_Length << 8);
360 if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
361 netdev_warn(padapter->pnetdev, "r8712u: nRemain_Length is %d and nSubframe_Length is: %d\n",
362 a_len, nSubframe_Length);
365 /* move the data point to data content */
368 /* Allocate new skb for releasing to upper layer */
369 sub_skb = dev_alloc_skb(nSubframe_Length + 12);
372 skb_reserve(sub_skb, 12);
373 data_ptr = (u8 *)skb_put(sub_skb, nSubframe_Length);
374 memcpy(data_ptr, pdata, nSubframe_Length);
375 subframes[nr_subframes++] = sub_skb;
376 if (nr_subframes >= MAX_SUBFRAME_COUNT) {
377 netdev_warn(padapter->pnetdev, "r8712u: ParseSubframe(): Too many Subframes! Packets dropped!\n");
380 pdata += nSubframe_Length;
381 a_len -= nSubframe_Length;
383 padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & 3);
384 if (padding_len == 4)
386 if (a_len < padding_len)
388 pdata += padding_len;
389 a_len -= padding_len;
392 for (i = 0; i < nr_subframes; i++) {
393 sub_skb = subframes[i];
394 /* convert hdr + possible LLC headers into Ethernet header */
395 eth_type = (sub_skb->data[6] << 8) | sub_skb->data[7];
396 if (sub_skb->len >= 8 &&
397 ((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) &&
398 eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
399 !memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE))) {
400 /* remove RFC1042 or Bridge-Tunnel encapsulation and
401 * replace EtherType */
402 skb_pull(sub_skb, SNAP_SIZE);
403 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
405 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
409 /* Leave Ethernet header part of hdr and full payload */
410 len = htons(sub_skb->len);
411 memcpy(skb_push(sub_skb, 2), &len, 2);
412 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
414 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
417 /* Indicate the packets to upper layer */
420 eth_type_trans(sub_skb, padapter->pnetdev);
421 sub_skb->dev = padapter->pnetdev;
422 if ((pattrib->tcpchk_valid == 1) &&
423 (pattrib->tcp_chkrpt == 1)) {
424 sub_skb->ip_summed = CHECKSUM_UNNECESSARY;
426 sub_skb->ip_summed = CHECKSUM_NONE;
431 prframe->u.hdr.len = 0;
432 r8712_free_recvframe(prframe, pfree_recv_queue);
436 void r8712_rxcmd_event_hdl(struct _adapter *padapter, void *prxcmdbuf)
440 u16 pkt_len, cmd_len, drvinfo_sz;
442 struct recv_stat *prxstat;
444 poffset = (u8 *)prxcmdbuf;
445 voffset = *(uint *)poffset;
446 pkt_len = le32_to_cpu(voffset) & 0x00003fff;
447 prxstat = (struct recv_stat *)prxcmdbuf;
448 drvinfo_sz = ((le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16);
449 drvinfo_sz = drvinfo_sz << 3;
450 poffset += RXDESC_SIZE + drvinfo_sz;
452 voffset = *(uint *)poffset;
453 cmd_len = (u16)(le32_to_cpu(voffset) & 0xffff);
454 cmd_seq = (u8)((le32_to_cpu(voffset) >> 24) & 0x7f);
455 eid = (u8)((le32_to_cpu(voffset) >> 16) & 0xff);
456 r8712_event_handle(padapter, (uint *)poffset);
457 poffset += (cmd_len + 8);/*8 bytes alignment*/
458 } while (le32_to_cpu(voffset) & BIT(31));
462 static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl,
465 u8 wsize = preorder_ctrl->wsize_b;
466 u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) % 4096;
468 /* Rx Reorder initialize condition.*/
469 if (preorder_ctrl->indicate_seq == 0xffff)
470 preorder_ctrl->indicate_seq = seq_num;
471 /* Drop out the packet which SeqNum is smaller than WinStart */
472 if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
475 * Sliding window manipulation. Conditions includes:
476 * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
477 * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
479 if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq))
480 preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq +
482 else if (SN_LESS(wend, seq_num)) {
483 if (seq_num >= (wsize - 1))
484 preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
486 preorder_ctrl->indicate_seq = 4095 - (wsize -
492 static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
493 union recv_frame *prframe)
495 struct list_head *phead, *plist;
496 union recv_frame *pnextrframe;
497 struct rx_pkt_attrib *pnextattrib;
498 struct __queue *ppending_recvframe_queue =
499 &preorder_ctrl->pending_recvframe_queue;
500 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
502 phead = get_list_head(ppending_recvframe_queue);
503 plist = get_next(phead);
504 while (end_of_queue_search(phead, plist) == false) {
505 pnextrframe = LIST_CONTAINOR(plist, union recv_frame, u);
506 pnextattrib = &pnextrframe->u.hdr.attrib;
507 if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
508 plist = get_next(plist);
509 else if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
514 list_delete(&(prframe->u.hdr.list));
515 list_insert_tail(&(prframe->u.hdr.list), plist);
519 int r8712_recv_indicatepkts_in_order(struct _adapter *padapter,
520 struct recv_reorder_ctrl *preorder_ctrl,
523 struct list_head *phead, *plist;
524 union recv_frame *prframe;
525 struct rx_pkt_attrib *pattrib;
526 int bPktInBuf = false;
527 struct recv_priv *precvpriv = &padapter->recvpriv;
528 struct __queue *ppending_recvframe_queue =
529 &preorder_ctrl->pending_recvframe_queue;
531 phead = get_list_head(ppending_recvframe_queue);
532 plist = get_next(phead);
533 /* Handling some condition for forced indicate case.*/
534 if (bforced == true) {
535 if (is_list_empty(phead))
538 prframe = LIST_CONTAINOR(plist, union recv_frame, u);
539 pattrib = &prframe->u.hdr.attrib;
540 preorder_ctrl->indicate_seq = pattrib->seq_num;
543 /* Prepare indication list and indication.
544 * Check if there is any packet need indicate. */
545 while (!is_list_empty(phead)) {
546 prframe = LIST_CONTAINOR(plist, union recv_frame, u);
547 pattrib = &prframe->u.hdr.attrib;
548 if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
549 plist = get_next(plist);
550 list_delete(&(prframe->u.hdr.list));
551 if (SN_EQUAL(preorder_ctrl->indicate_seq,
553 preorder_ctrl->indicate_seq =
554 (preorder_ctrl->indicate_seq + 1) % 4096;
555 /*indicate this recv_frame*/
556 if (!pattrib->amsdu) {
557 if ((padapter->bDriverStopped == false) &&
558 (padapter->bSurpriseRemoved == false)) {
559 /* indicate this recv_frame */
560 r8712_recv_indicatepkt(padapter,
563 } else if (pattrib->amsdu == 1) {
564 if (amsdu_to_msdu(padapter, prframe) !=
566 r8712_free_recvframe(prframe,
567 &precvpriv->free_recv_queue);
569 /* Update local variables. */
579 static int recv_indicatepkt_reorder(struct _adapter *padapter,
580 union recv_frame *prframe)
583 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
584 struct recv_reorder_ctrl *preorder_ctrl = prframe->u.hdr.preorder_ctrl;
585 struct __queue *ppending_recvframe_queue =
586 &preorder_ctrl->pending_recvframe_queue;
588 if (!pattrib->amsdu) {
590 r8712_wlanhdr_to_ethhdr(prframe);
591 if (pattrib->qos != 1) {
592 if ((padapter->bDriverStopped == false) &&
593 (padapter->bSurpriseRemoved == false)) {
594 r8712_recv_indicatepkt(padapter, prframe);
600 spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
601 /*s2. check if winstart_b(indicate_seq) needs to be updated*/
602 if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num))
604 /*s3. Insert all packet into Reorder Queue to maintain its ordering.*/
605 if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
608 * Indication process.
609 * After Packet dropping and Sliding Window shifting as above, we can
610 * now just indicate the packets with the SeqNum smaller than latest
611 * WinStart and buffer other packets.
613 * For Rx Reorder condition:
614 * 1. All packets with SeqNum smaller than WinStart => Indicate
615 * 2. All packets with SeqNum larger than or equal to
616 * WinStart => Buffer it.
618 if (r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, false) ==
620 _set_timer(&preorder_ctrl->reordering_ctrl_timer,
622 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
624 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
625 _cancel_timer_ex(&preorder_ctrl->reordering_ctrl_timer);
629 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
633 void r8712_reordering_ctrl_timeout_handler(void *pcontext)
636 struct recv_reorder_ctrl *preorder_ctrl =
637 (struct recv_reorder_ctrl *)pcontext;
638 struct _adapter *padapter = preorder_ctrl->padapter;
639 struct __queue *ppending_recvframe_queue =
640 &preorder_ctrl->pending_recvframe_queue;
642 if (padapter->bDriverStopped || padapter->bSurpriseRemoved)
644 spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
645 r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, true);
646 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
649 static int r8712_process_recv_indicatepkts(struct _adapter *padapter,
650 union recv_frame *prframe)
652 int retval = _SUCCESS;
653 struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
654 struct ht_priv *phtpriv = &pmlmepriv->htpriv;
656 if (phtpriv->ht_option == 1) { /*B/G/N Mode*/
657 if (recv_indicatepkt_reorder(padapter, prframe) != _SUCCESS) {
658 /* including perform A-MPDU Rx Ordering Buffer Control*/
659 if ((padapter->bDriverStopped == false) &&
660 (padapter->bSurpriseRemoved == false))
663 } else { /*B/G mode*/
664 retval = r8712_wlanhdr_to_ethhdr(prframe);
665 if (retval != _SUCCESS)
667 if ((padapter->bDriverStopped == false) &&
668 (padapter->bSurpriseRemoved == false)) {
669 /* indicate this recv_frame */
670 r8712_recv_indicatepkt(padapter, prframe);
677 static u8 query_rx_pwr_percentage(s8 antpower)
679 if ((antpower <= -100) || (antpower >= 20))
681 else if (antpower >= 0)
684 return 100 + antpower;
687 static u8 evm_db2percentage(s8 value)
690 * -33dB~0dB to 0%~99%
706 s32 r8712_signal_scale_mapping(s32 cur_sig)
710 if (cur_sig >= 51 && cur_sig <= 100)
712 else if (cur_sig >= 41 && cur_sig <= 50)
713 ret_sig = 80 + ((cur_sig - 40) * 2);
714 else if (cur_sig >= 31 && cur_sig <= 40)
715 ret_sig = 66 + (cur_sig - 30);
716 else if (cur_sig >= 21 && cur_sig <= 30)
717 ret_sig = 54 + (cur_sig - 20);
718 else if (cur_sig >= 10 && cur_sig <= 20)
719 ret_sig = 42 + (((cur_sig - 10) * 2) / 3);
720 else if (cur_sig >= 5 && cur_sig <= 9)
721 ret_sig = 22 + (((cur_sig - 5) * 3) / 2);
722 else if (cur_sig >= 1 && cur_sig <= 4)
723 ret_sig = 6 + (((cur_sig - 1) * 3) / 2);
729 static s32 translate2dbm(struct _adapter *padapter, u8 signal_strength_idx)
731 s32 signal_power; /* in dBm.*/
732 /* Translate to dBm (x=0.5y-95).*/
733 signal_power = (s32)((signal_strength_idx + 1) >> 1);
738 static void query_rx_phy_status(struct _adapter *padapter,
739 union recv_frame *prframe)
741 u8 i, max_spatial_stream, evm;
742 struct recv_stat *prxstat = (struct recv_stat *)prframe->u.hdr.rx_head;
743 struct phy_stat *pphy_stat = (struct phy_stat *)(prxstat + 1);
744 u8 *pphy_head = (u8 *)(prxstat + 1);
745 s8 rx_pwr[4], rx_pwr_all;
747 u32 rssi, total_rssi = 0;
748 u8 bcck_rate = 0, rf_rx_num = 0, cck_highpwr = 0;
749 struct phy_cck_rx_status *pcck_buf;
752 /* Record it for next packet processing*/
753 bcck_rate = (prframe->u.hdr.attrib.mcs_rate <= 3 ? 1 : 0);
757 /* CCK Driver info Structure is not the same as OFDM packet.*/
758 pcck_buf = (struct phy_cck_rx_status *)pphy_stat;
759 /* (1)Hardware does not provide RSSI for CCK
760 * (2)PWDB, Average PWDB cacluated by hardware
761 * (for rate adaptive)
764 report = pcck_buf->cck_agc_rpt & 0xc0;
765 report = report >> 6;
767 /* Modify the RF RNA gain value to -40, -20,
768 * -2, 14 by Jenyu's suggestion
769 * Note: different RF with the different
772 rx_pwr_all = -40 - (pcck_buf->cck_agc_rpt &
776 rx_pwr_all = -20 - (pcck_buf->cck_agc_rpt &
780 rx_pwr_all = -2 - (pcck_buf->cck_agc_rpt &
784 rx_pwr_all = 14 - (pcck_buf->cck_agc_rpt &
789 report = ((u8)(le32_to_cpu(pphy_stat->phydw1) >> 8)) &
791 report = report >> 5;
794 rx_pwr_all = -40 - ((pcck_buf->cck_agc_rpt &
798 rx_pwr_all = -20 - ((pcck_buf->cck_agc_rpt &
802 rx_pwr_all = -2 - ((pcck_buf->cck_agc_rpt &
806 rx_pwr_all = 14 - ((pcck_buf->cck_agc_rpt &
811 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
812 /* CCK gain is smaller than OFDM/MCS gain,*/
813 /* so we add gain diff by experiences, the val is 6 */
817 /* modify the offset to make the same gain index with OFDM.*/
818 if (pwdb_all > 34 && pwdb_all <= 42)
820 else if (pwdb_all > 26 && pwdb_all <= 34)
822 else if (pwdb_all > 14 && pwdb_all <= 26)
824 else if (pwdb_all > 4 && pwdb_all <= 14)
827 * (3) Get Signal Quality (EVM)
832 sq = pcck_buf->sq_rpt;
833 if (pcck_buf->sq_rpt > 64)
835 else if (pcck_buf->sq_rpt < 20)
838 sq = ((64-sq) * 100) / 44;
840 prframe->u.hdr.attrib.signal_qual = sq;
841 prframe->u.hdr.attrib.rx_mimo_signal_qual[0] = sq;
842 prframe->u.hdr.attrib.rx_mimo_signal_qual[1] = -1;
844 /* (1)Get RSSI for HT rate */
845 for (i = 0; i < ((padapter->registrypriv.rf_config) &
848 rx_pwr[i] = ((pphy_head[PHY_STAT_GAIN_TRSW_SHT + i]
850 /* Translate DBM to percentage. */
851 rssi = query_rx_pwr_percentage(rx_pwr[i]);
854 /* (2)PWDB, Average PWDB cacluated by hardware (for
856 rx_pwr_all = (((pphy_head[PHY_STAT_PWDB_ALL_SHT]) >> 1) & 0x7f)
858 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
861 /* (3)EVM of HT rate */
862 if (prframe->u.hdr.attrib.htc &&
863 prframe->u.hdr.attrib.mcs_rate >= 20 &&
864 prframe->u.hdr.attrib.mcs_rate <= 27) {
865 /* both spatial stream make sense */
866 max_spatial_stream = 2;
868 /* only spatial stream 1 makes sense */
869 max_spatial_stream = 1;
871 for (i = 0; i < max_spatial_stream; i++) {
872 evm = evm_db2percentage((pphy_head
873 [PHY_STAT_RXEVM_SHT + i]));/*dbm*/
874 prframe->u.hdr.attrib.signal_qual =
876 prframe->u.hdr.attrib.rx_mimo_signal_qual[i] =
881 /* UI BSS List signal strength(in percentage), make it good looking,
882 * from 0~100. It is assigned to the BSS List in
883 * GetValueFromBeaconOrProbeRsp(). */
885 prframe->u.hdr.attrib.signal_strength =
886 (u8)r8712_signal_scale_mapping(pwdb_all);
889 prframe->u.hdr.attrib.signal_strength =
890 (u8)(r8712_signal_scale_mapping(total_rssi /=
895 static void process_link_qual(struct _adapter *padapter,
896 union recv_frame *prframe)
898 u32 last_evm = 0, tmpVal;
899 struct rx_pkt_attrib *pattrib;
901 if (prframe == NULL || padapter == NULL)
903 pattrib = &prframe->u.hdr.attrib;
904 if (pattrib->signal_qual != 0) {
906 * 1. Record the general EVM to the sliding window.
908 if (padapter->recvpriv.signal_qual_data.total_num++ >=
909 PHY_LINKQUALITY_SLID_WIN_MAX) {
910 padapter->recvpriv.signal_qual_data.total_num =
911 PHY_LINKQUALITY_SLID_WIN_MAX;
912 last_evm = padapter->recvpriv.signal_qual_data.elements
913 [padapter->recvpriv.signal_qual_data.index];
914 padapter->recvpriv.signal_qual_data.total_val -=
917 padapter->recvpriv.signal_qual_data.total_val +=
918 pattrib->signal_qual;
919 padapter->recvpriv.signal_qual_data.elements[padapter->
920 recvpriv.signal_qual_data.index++] =
921 pattrib->signal_qual;
922 if (padapter->recvpriv.signal_qual_data.index >=
923 PHY_LINKQUALITY_SLID_WIN_MAX)
924 padapter->recvpriv.signal_qual_data.index = 0;
926 /* <1> Showed on UI for user, in percentage. */
927 tmpVal = padapter->recvpriv.signal_qual_data.total_val /
928 padapter->recvpriv.signal_qual_data.total_num;
929 padapter->recvpriv.signal = (u8)tmpVal;
933 static void process_rssi(struct _adapter *padapter, union recv_frame *prframe)
935 u32 last_rssi, tmp_val;
936 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
938 if (padapter->recvpriv.signal_strength_data.total_num++ >=
939 PHY_RSSI_SLID_WIN_MAX) {
940 padapter->recvpriv.signal_strength_data.total_num =
941 PHY_RSSI_SLID_WIN_MAX;
942 last_rssi = padapter->recvpriv.signal_strength_data.elements
943 [padapter->recvpriv.signal_strength_data.index];
944 padapter->recvpriv.signal_strength_data.total_val -= last_rssi;
946 padapter->recvpriv.signal_strength_data.total_val +=
947 pattrib->signal_strength;
948 padapter->recvpriv.signal_strength_data.elements[padapter->recvpriv.
949 signal_strength_data.index++] =
950 pattrib->signal_strength;
951 if (padapter->recvpriv.signal_strength_data.index >=
952 PHY_RSSI_SLID_WIN_MAX)
953 padapter->recvpriv.signal_strength_data.index = 0;
954 tmp_val = padapter->recvpriv.signal_strength_data.total_val /
955 padapter->recvpriv.signal_strength_data.total_num;
956 padapter->recvpriv.rssi = (s8)translate2dbm(padapter, (u8)tmp_val);
959 static void process_phy_info(struct _adapter *padapter,
960 union recv_frame *prframe)
962 query_rx_phy_status(padapter, prframe);
963 process_rssi(padapter, prframe);
964 process_link_qual(padapter, prframe);
967 int recv_func(struct _adapter *padapter, void *pcontext)
969 struct rx_pkt_attrib *pattrib;
970 union recv_frame *prframe, *orig_prframe;
971 int retval = _SUCCESS;
972 struct __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
973 struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
975 prframe = (union recv_frame *)pcontext;
976 orig_prframe = prframe;
977 pattrib = &prframe->u.hdr.attrib;
978 if ((check_fwstate(pmlmepriv, WIFI_MP_STATE) == true)) {
979 if (pattrib->crc_err == 1)
980 padapter->mppriv.rx_crcerrpktcount++;
982 padapter->mppriv.rx_pktcount++;
983 if (check_fwstate(pmlmepriv, WIFI_MP_LPBK_STATE) == false) {
984 /* free this recv_frame */
985 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
986 goto _exit_recv_func;
989 /* check the frame crtl field and decache */
990 retval = r8712_validate_recv_frame(padapter, prframe);
991 if (retval != _SUCCESS) {
992 /* free this recv_frame */
993 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
994 goto _exit_recv_func;
996 process_phy_info(padapter, prframe);
997 prframe = r8712_decryptor(padapter, prframe);
998 if (prframe == NULL) {
1000 goto _exit_recv_func;
1002 prframe = r8712_recvframe_chk_defrag(padapter, prframe);
1003 if (prframe == NULL)
1004 goto _exit_recv_func;
1005 prframe = r8712_portctrl(padapter, prframe);
1006 if (prframe == NULL) {
1008 goto _exit_recv_func;
1010 retval = r8712_process_recv_indicatepkts(padapter, prframe);
1011 if (retval != _SUCCESS) {
1012 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
1013 goto _exit_recv_func;
1019 static int recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
1021 u8 *pbuf, shift_sz = 0;
1025 struct recv_stat *prxstat;
1026 u16 pkt_cnt, drvinfo_sz, pkt_offset, tmp_len, alloc_sz;
1027 struct __queue *pfree_recv_queue;
1028 _pkt *pkt_copy = NULL;
1029 union recv_frame *precvframe = NULL;
1030 struct recv_priv *precvpriv = &padapter->recvpriv;
1032 pfree_recv_queue = &(precvpriv->free_recv_queue);
1034 prxstat = (struct recv_stat *)pbuf;
1035 pkt_cnt = (le32_to_cpu(prxstat->rxdw2)>>16)&0xff;
1036 pkt_len = le32_to_cpu(prxstat->rxdw0)&0x00003fff;
1037 transfer_len = pskb->len;
1038 /* Test throughput with Netgear 3700 (No security) with Chariot 3T3R
1039 * pairs. The packet count will be a big number so that the containing
1040 * packet will effect the Rx reordering. */
1041 if (transfer_len < pkt_len) {
1042 /* In this case, it means the MAX_RECVBUF_SZ is too small to
1043 * get the data from 8712u. */
1047 prxstat = (struct recv_stat *)pbuf;
1048 pkt_len = le32_to_cpu(prxstat->rxdw0)&0x00003fff;
1049 /* more fragment bit */
1050 mf = (le32_to_cpu(prxstat->rxdw1) >> 27) & 0x1;
1051 /* ragmentation number */
1052 frag = (le32_to_cpu(prxstat->rxdw2) >> 12) & 0xf;
1053 /* uint 2^3 = 8 bytes */
1054 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
1055 drvinfo_sz = drvinfo_sz<<3;
1057 goto _exit_recvbuf2recvframe;
1058 /* Qos data, wireless lan header length is 26 */
1059 if ((le32_to_cpu(prxstat->rxdw0) >> 23) & 0x01)
1061 precvframe = r8712_alloc_recvframe(pfree_recv_queue);
1062 if (precvframe == NULL)
1063 goto _exit_recvbuf2recvframe;
1064 _init_listhead(&precvframe->u.hdr.list);
1065 precvframe->u.hdr.precvbuf = NULL; /*can't access the precvbuf*/
1066 precvframe->u.hdr.len = 0;
1067 tmp_len = pkt_len + drvinfo_sz + RXDESC_SIZE;
1068 pkt_offset = (u16)_RND128(tmp_len);
1069 /* for first fragment packet, driver need allocate 1536 +
1070 * drvinfo_sz + RXDESC_SIZE to defrag packet. */
1071 if ((mf == 1) && (frag == 0))
1072 alloc_sz = 1658;/*1658+6=1664, 1664 is 128 alignment.*/
1075 /* 2 is for IP header 4 bytes alignment in QoS packet case.
1076 * 4 is for skb->data 4 bytes alignment. */
1078 pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz);
1080 precvframe->u.hdr.pkt = pkt_copy;
1081 skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data)
1083 skb_reserve(pkt_copy, shift_sz);
1084 memcpy(pkt_copy->data, pbuf, tmp_len);
1085 precvframe->u.hdr.rx_head = precvframe->u.hdr.rx_data =
1086 precvframe->u.hdr.rx_tail = pkt_copy->data;
1087 precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
1089 precvframe->u.hdr.pkt = skb_clone(pskb, GFP_ATOMIC);
1090 if (!precvframe->u.hdr.pkt)
1092 precvframe->u.hdr.rx_head = pbuf;
1093 precvframe->u.hdr.rx_data = pbuf;
1094 precvframe->u.hdr.rx_tail = pbuf;
1095 precvframe->u.hdr.rx_end = pbuf + alloc_sz;
1097 recvframe_put(precvframe, tmp_len);
1098 recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE);
1099 /* because the endian issue, driver avoid reference to the
1100 * rxstat after calling update_recvframe_attrib_from_recvstat();
1102 update_recvframe_attrib_from_recvstat(&precvframe->u.hdr.attrib,
1104 r8712_recv_entry(precvframe);
1105 transfer_len -= pkt_offset;
1110 } while ((transfer_len > 0) && pkt_cnt > 0);
1111 _exit_recvbuf2recvframe:
1115 static void recv_tasklet(void *priv)
1117 struct sk_buff *pskb;
1118 struct _adapter *padapter = (struct _adapter *)priv;
1119 struct recv_priv *precvpriv = &padapter->recvpriv;
1121 while (NULL != (pskb = skb_dequeue(&precvpriv->rx_skb_queue))) {
1122 recvbuf2recvframe(padapter, pskb);
1123 skb_reset_tail_pointer(pskb);
1125 if (!skb_cloned(pskb))
1126 skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);