1 // SPDX-License-Identifier: GPL-2.0
2 /******************************************************************************
5 * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
6 * Linux device driver for RTL8192SU
8 * Modifications for inclusion into the Linux staging tree are
9 * Copyright(c) 2010 Larry Finger. All rights reserved.
11 * Contact information:
12 * WLAN FAE <wlanfae@realtek.com>
13 * Larry Finger <Larry.Finger@lwfinger.net>
15 ******************************************************************************/
17 #define _RTL8712_RECV_C_
19 #include <linux/if_ether.h>
22 #include "osdep_service.h"
23 #include "drv_types.h"
24 #include "recv_osdep.h"
25 #include "mlme_osdep.h"
30 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
31 static u8 bridge_tunnel_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8};
33 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
34 static u8 rfc1042_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
36 static void recv_tasklet(unsigned long priv);
38 void r8712_init_recv_priv(struct recv_priv *precvpriv,
39 struct _adapter *padapter)
42 struct recv_buf *precvbuf;
45 struct sk_buff *pskb = NULL;
48 _init_queue(&precvpriv->free_recv_buf_queue);
49 precvpriv->pallocated_recv_buf =
50 kzalloc(NR_RECVBUFF * sizeof(struct recv_buf) + 4, GFP_ATOMIC);
51 if (!precvpriv->pallocated_recv_buf)
53 precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 -
54 ((addr_t)(precvpriv->pallocated_recv_buf) & 3);
55 precvbuf = (struct recv_buf *)precvpriv->precv_buf;
56 for (i = 0; i < NR_RECVBUFF; i++) {
57 INIT_LIST_HEAD(&precvbuf->list);
58 spin_lock_init(&precvbuf->recvbuf_lock);
59 if (r8712_os_recvbuf_resource_alloc(padapter, precvbuf))
61 precvbuf->ref_cnt = 0;
62 precvbuf->adapter = padapter;
63 list_add_tail(&precvbuf->list,
64 &(precvpriv->free_recv_buf_queue.queue));
67 precvpriv->free_recv_buf_queue_cnt = NR_RECVBUFF;
68 tasklet_init(&precvpriv->recv_tasklet, recv_tasklet,
69 (unsigned long)padapter);
70 skb_queue_head_init(&precvpriv->rx_skb_queue);
72 skb_queue_head_init(&precvpriv->free_recv_skb_queue);
73 for (i = 0; i < NR_PREALLOC_RECV_SKB; i++) {
74 pskb = netdev_alloc_skb(padapter->pnetdev, MAX_RECVBUF_SZ +
77 tmpaddr = (addr_t)pskb->data;
78 alignment = tmpaddr & (RECVBUFF_ALIGN_SZ - 1);
79 skb_reserve(pskb, (RECVBUFF_ALIGN_SZ - alignment));
80 skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
86 void r8712_free_recv_priv(struct recv_priv *precvpriv)
89 struct recv_buf *precvbuf;
90 struct _adapter *padapter = precvpriv->adapter;
92 precvbuf = (struct recv_buf *)precvpriv->precv_buf;
93 for (i = 0; i < NR_RECVBUFF; i++) {
94 r8712_os_recvbuf_resource_free(padapter, precvbuf);
97 kfree(precvpriv->pallocated_recv_buf);
98 skb_queue_purge(&precvpriv->rx_skb_queue);
99 if (skb_queue_len(&precvpriv->rx_skb_queue))
100 netdev_warn(padapter->pnetdev, "r8712u: rx_skb_queue not empty\n");
101 skb_queue_purge(&precvpriv->free_recv_skb_queue);
102 if (skb_queue_len(&precvpriv->free_recv_skb_queue))
103 netdev_warn(padapter->pnetdev, "r8712u: free_recv_skb_queue not empty %d\n",
104 skb_queue_len(&precvpriv->free_recv_skb_queue));
107 void r8712_init_recvbuf(struct _adapter *padapter, struct recv_buf *precvbuf)
109 precvbuf->transfer_len = 0;
111 precvbuf->ref_cnt = 0;
112 if (precvbuf->pbuf) {
113 precvbuf->pdata = precvbuf->pbuf;
114 precvbuf->phead = precvbuf->pbuf;
115 precvbuf->ptail = precvbuf->pbuf;
116 precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ;
120 void r8712_free_recvframe(union recv_frame *precvframe,
121 struct __queue *pfree_recv_queue)
124 struct _adapter *padapter = precvframe->u.hdr.adapter;
125 struct recv_priv *precvpriv = &padapter->recvpriv;
127 if (precvframe->u.hdr.pkt) {
128 dev_kfree_skb_any(precvframe->u.hdr.pkt);/*free skb by driver*/
129 precvframe->u.hdr.pkt = NULL;
131 spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
132 list_del_init(&(precvframe->u.hdr.list));
133 list_add_tail(&(precvframe->u.hdr.list), &pfree_recv_queue->queue);
135 if (pfree_recv_queue == &precvpriv->free_recv_queue)
136 precvpriv->free_recvframe_cnt++;
138 spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
141 static void update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib *pattrib,
142 struct recv_stat *prxstat)
146 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
151 pattrib->bdecrypted = ((le32_to_cpu(prxstat->rxdw0) & BIT(27)) >> 27)
153 pattrib->crc_err = (le32_to_cpu(prxstat->rxdw0) & BIT(14)) >> 14;
157 if (le32_to_cpu(prxstat->rxdw3) & BIT(13)) {
158 pattrib->tcpchk_valid = 1; /* valid */
159 if (le32_to_cpu(prxstat->rxdw3) & BIT(11))
160 pattrib->tcp_chkrpt = 1; /* correct */
162 pattrib->tcp_chkrpt = 0; /* incorrect */
163 if (le32_to_cpu(prxstat->rxdw3) & BIT(12))
164 pattrib->ip_chkrpt = 1; /* correct */
166 pattrib->ip_chkrpt = 0; /* incorrect */
168 pattrib->tcpchk_valid = 0; /* invalid */
170 pattrib->mcs_rate = (u8)((le32_to_cpu(prxstat->rxdw3)) & 0x3f);
171 pattrib->htc = (u8)((le32_to_cpu(prxstat->rxdw3) >> 14) & 0x1);
178 static union recv_frame *recvframe_defrag(struct _adapter *adapter,
179 struct __queue *defrag_q)
181 struct list_head *plist, *phead;
184 struct recv_frame_hdr *pfhdr, *pnfhdr;
185 union recv_frame *prframe, *pnextrframe;
186 struct __queue *pfree_recv_queue;
188 pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
189 phead = &defrag_q->queue;
191 prframe = container_of(plist, union recv_frame, u.list);
192 list_del_init(&prframe->u.list);
193 pfhdr = &prframe->u.hdr;
195 if (curfragnum != pfhdr->attrib.frag_num) {
196 /*the first fragment number must be 0
197 *free the whole queue
199 r8712_free_recvframe(prframe, pfree_recv_queue);
200 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
204 plist = &defrag_q->queue;
206 while (!end_of_queue_search(phead, plist)) {
207 pnextrframe = container_of(plist, union recv_frame, u.list);
208 pnfhdr = &pnextrframe->u.hdr;
209 /*check the fragment sequence (2nd ~n fragment frame) */
210 if (curfragnum != pnfhdr->attrib.frag_num) {
211 /* the fragment number must increase (after decache)
212 * release the defrag_q & prframe
214 r8712_free_recvframe(prframe, pfree_recv_queue);
215 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
219 /* copy the 2nd~n fragment frame's payload to the first fragment
220 * get the 2nd~last fragment frame's payload
222 wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;
223 recvframe_pull(pnextrframe, wlanhdr_offset);
224 /* append to first fragment frame's tail (if privacy frame,
227 recvframe_pull_tail(prframe, pfhdr->attrib.icv_len);
228 memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len);
229 recvframe_put(prframe, pnfhdr->len);
230 pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
233 /* free the defrag_q queue and return the prframe */
234 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
238 /* check if need to defrag, if needed queue the frame to defrag_q */
239 union recv_frame *r8712_recvframe_chk_defrag(struct _adapter *padapter,
240 union recv_frame *precv_frame)
245 struct recv_frame_hdr *pfhdr;
246 struct sta_info *psta;
247 struct sta_priv *pstapriv;
248 struct list_head *phead;
249 union recv_frame *prtnframe = NULL;
250 struct __queue *pfree_recv_queue, *pdefrag_q;
252 pstapriv = &padapter->stapriv;
253 pfhdr = &precv_frame->u.hdr;
254 pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
255 /* need to define struct of wlan header frame ctrl */
256 ismfrag = pfhdr->attrib.mfrag;
257 fragnum = pfhdr->attrib.frag_num;
258 psta_addr = pfhdr->attrib.ta;
259 psta = r8712_get_stainfo(pstapriv, psta_addr);
263 pdefrag_q = &psta->sta_recvpriv.defrag_q;
265 if ((ismfrag == 0) && (fragnum == 0))
266 prtnframe = precv_frame;/*isn't a fragment frame*/
268 /* 0~(n-1) fragment frame
269 * enqueue to defraf_g
273 /*the first fragment*/
274 if (!list_empty(&pdefrag_q->queue)) {
275 /*free current defrag_q */
276 r8712_free_recvframe_queue(pdefrag_q,
280 /* Then enqueue the 0~(n-1) fragment to the defrag_q */
281 phead = &pdefrag_q->queue;
282 list_add_tail(&pfhdr->list, phead);
285 /* can't find this ta's defrag_queue, so free this
288 r8712_free_recvframe(precv_frame, pfree_recv_queue);
292 if ((ismfrag == 0) && (fragnum != 0)) {
293 /* the last fragment frame
294 * enqueue the last fragment
297 phead = &pdefrag_q->queue;
298 list_add_tail(&pfhdr->list, phead);
299 /*call recvframe_defrag to defrag*/
300 precv_frame = recvframe_defrag(padapter, pdefrag_q);
301 prtnframe = precv_frame;
303 /* can't find this ta's defrag_queue, so free this
306 r8712_free_recvframe(precv_frame, pfree_recv_queue);
310 if (prtnframe && (prtnframe->u.hdr.attrib.privacy)) {
311 /* after defrag we must check tkip mic code */
312 if (r8712_recvframe_chkmic(padapter, prtnframe) == _FAIL) {
313 r8712_free_recvframe(prtnframe, pfree_recv_queue);
320 static void amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe)
322 int a_len, padding_len;
323 u16 eth_type, nSubframe_Length;
325 unsigned char *pdata;
326 struct rx_pkt_attrib *pattrib;
327 _pkt *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
328 struct recv_priv *precvpriv = &padapter->recvpriv;
329 struct __queue *pfree_recv_queue = &(precvpriv->free_recv_queue);
332 pattrib = &prframe->u.hdr.attrib;
333 recvframe_pull(prframe, prframe->u.hdr.attrib.hdrlen);
334 if (prframe->u.hdr.attrib.iv_len > 0)
335 recvframe_pull(prframe, prframe->u.hdr.attrib.iv_len);
336 a_len = prframe->u.hdr.len;
337 pdata = prframe->u.hdr.rx_data;
338 while (a_len > ETH_HLEN) {
339 /* Offset 12 denote 2 mac address */
340 nSubframe_Length = *((u16 *)(pdata + 12));
341 /*==m==>change the length order*/
342 nSubframe_Length = (nSubframe_Length >> 8) +
343 (nSubframe_Length << 8);
344 if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
345 netdev_warn(padapter->pnetdev, "r8712u: nRemain_Length is %d and nSubframe_Length is: %d\n",
346 a_len, nSubframe_Length);
349 /* move the data point to data content */
352 /* Allocate new skb for releasing to upper layer */
353 sub_skb = dev_alloc_skb(nSubframe_Length + 12);
356 skb_reserve(sub_skb, 12);
357 skb_put_data(sub_skb, pdata, nSubframe_Length);
358 subframes[nr_subframes++] = sub_skb;
359 if (nr_subframes >= MAX_SUBFRAME_COUNT) {
360 netdev_warn(padapter->pnetdev, "r8712u: ParseSubframe(): Too many Subframes! Packets dropped!\n");
363 pdata += nSubframe_Length;
364 a_len -= nSubframe_Length;
366 padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & 3);
367 if (padding_len == 4)
369 if (a_len < padding_len)
371 pdata += padding_len;
372 a_len -= padding_len;
375 for (i = 0; i < nr_subframes; i++) {
376 sub_skb = subframes[i];
377 /* convert hdr + possible LLC headers into Ethernet header */
378 eth_type = (sub_skb->data[6] << 8) | sub_skb->data[7];
379 if (sub_skb->len >= 8 &&
380 ((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) &&
381 eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
382 !memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE))) {
383 /* remove RFC1042 or Bridge-Tunnel encapsulation and
386 skb_pull(sub_skb, SNAP_SIZE);
387 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
389 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
393 /* Leave Ethernet header part of hdr and full payload */
394 len = htons(sub_skb->len);
395 memcpy(skb_push(sub_skb, 2), &len, 2);
396 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
398 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
401 /* Indicate the packets to upper layer */
404 eth_type_trans(sub_skb, padapter->pnetdev);
405 sub_skb->dev = padapter->pnetdev;
406 if ((pattrib->tcpchk_valid == 1) &&
407 (pattrib->tcp_chkrpt == 1)) {
408 sub_skb->ip_summed = CHECKSUM_UNNECESSARY;
410 sub_skb->ip_summed = CHECKSUM_NONE;
416 prframe->u.hdr.len = 0;
417 r8712_free_recvframe(prframe, pfree_recv_queue);
420 void r8712_rxcmd_event_hdl(struct _adapter *padapter, void *prxcmdbuf)
424 u16 cmd_len, drvinfo_sz;
425 struct recv_stat *prxstat;
428 voffset = *(__le32 *)poffset;
430 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
432 poffset += RXDESC_SIZE + drvinfo_sz;
434 voffset = *(__le32 *)poffset;
435 cmd_len = (u16)(le32_to_cpu(voffset) & 0xffff);
436 r8712_event_handle(padapter, (__le32 *)poffset);
437 poffset += (cmd_len + 8);/*8 bytes alignment*/
438 } while (le32_to_cpu(voffset) & BIT(31));
441 static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl,
444 u8 wsize = preorder_ctrl->wsize_b;
445 u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) % 4096;
447 /* Rx Reorder initialize condition.*/
448 if (preorder_ctrl->indicate_seq == 0xffff)
449 preorder_ctrl->indicate_seq = seq_num;
450 /* Drop out the packet which SeqNum is smaller than WinStart */
451 if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
454 * Sliding window manipulation. Conditions includes:
455 * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
456 * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
458 if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq))
459 preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq +
461 else if (SN_LESS(wend, seq_num)) {
462 if (seq_num >= (wsize - 1))
463 preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
465 preorder_ctrl->indicate_seq = 4095 - (wsize -
471 static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
472 union recv_frame *prframe)
474 struct list_head *phead, *plist;
475 union recv_frame *pnextrframe;
476 struct rx_pkt_attrib *pnextattrib;
477 struct __queue *ppending_recvframe_queue =
478 &preorder_ctrl->pending_recvframe_queue;
479 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
481 phead = &ppending_recvframe_queue->queue;
483 while (!end_of_queue_search(phead, plist)) {
484 pnextrframe = container_of(plist, union recv_frame, u.list);
485 pnextattrib = &pnextrframe->u.hdr.attrib;
486 if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
488 else if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
493 list_del_init(&(prframe->u.hdr.list));
494 list_add_tail(&(prframe->u.hdr.list), plist);
498 int r8712_recv_indicatepkts_in_order(struct _adapter *padapter,
499 struct recv_reorder_ctrl *preorder_ctrl,
502 struct list_head *phead, *plist;
503 union recv_frame *prframe;
504 struct rx_pkt_attrib *pattrib;
505 int bPktInBuf = false;
506 struct __queue *ppending_recvframe_queue =
507 &preorder_ctrl->pending_recvframe_queue;
509 phead = &ppending_recvframe_queue->queue;
511 /* Handling some condition for forced indicate case.*/
513 if (list_empty(phead))
516 prframe = container_of(plist, union recv_frame, u.list);
517 pattrib = &prframe->u.hdr.attrib;
518 preorder_ctrl->indicate_seq = pattrib->seq_num;
520 /* Prepare indication list and indication.
521 * Check if there is any packet need indicate.
523 while (!list_empty(phead)) {
524 prframe = container_of(plist, union recv_frame, u.list);
525 pattrib = &prframe->u.hdr.attrib;
526 if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
528 list_del_init(&(prframe->u.hdr.list));
529 if (SN_EQUAL(preorder_ctrl->indicate_seq,
531 preorder_ctrl->indicate_seq =
532 (preorder_ctrl->indicate_seq + 1) % 4096;
533 /*indicate this recv_frame*/
534 if (!pattrib->amsdu) {
535 if (!padapter->driver_stopped &&
536 !padapter->surprise_removed) {
537 /* indicate this recv_frame */
538 r8712_recv_indicatepkt(padapter,
541 } else if (pattrib->amsdu == 1) {
542 amsdu_to_msdu(padapter, prframe);
544 /* Update local variables. */
554 static int recv_indicatepkt_reorder(struct _adapter *padapter,
555 union recv_frame *prframe)
558 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
559 struct recv_reorder_ctrl *preorder_ctrl = prframe->u.hdr.preorder_ctrl;
560 struct __queue *ppending_recvframe_queue =
561 &preorder_ctrl->pending_recvframe_queue;
563 if (!pattrib->amsdu) {
565 r8712_wlanhdr_to_ethhdr(prframe);
566 if (pattrib->qos != 1) {
567 if (!padapter->driver_stopped &&
568 !padapter->surprise_removed) {
569 r8712_recv_indicatepkt(padapter, prframe);
576 spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
577 /*s2. check if winstart_b(indicate_seq) needs to be updated*/
578 if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num))
580 /*s3. Insert all packet into Reorder Queue to maintain its ordering.*/
581 if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
584 * Indication process.
585 * After Packet dropping and Sliding Window shifting as above, we can
586 * now just indicate the packets with the SeqNum smaller than latest
587 * WinStart and buffer other packets.
589 * For Rx Reorder condition:
590 * 1. All packets with SeqNum smaller than WinStart => Indicate
591 * 2. All packets with SeqNum larger than or equal to
592 * WinStart => Buffer it.
594 if (r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, false)) {
595 mod_timer(&preorder_ctrl->reordering_ctrl_timer,
596 jiffies + msecs_to_jiffies(REORDER_WAIT_TIME));
597 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
599 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
600 del_timer(&preorder_ctrl->reordering_ctrl_timer);
604 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
608 void r8712_reordering_ctrl_timeout_handler(void *pcontext)
611 struct recv_reorder_ctrl *preorder_ctrl = pcontext;
612 struct _adapter *padapter = preorder_ctrl->padapter;
613 struct __queue *ppending_recvframe_queue =
614 &preorder_ctrl->pending_recvframe_queue;
616 if (padapter->driver_stopped || padapter->surprise_removed)
618 spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
619 r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, true);
620 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
623 static int r8712_process_recv_indicatepkts(struct _adapter *padapter,
624 union recv_frame *prframe)
626 int retval = _SUCCESS;
627 struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
628 struct ht_priv *phtpriv = &pmlmepriv->htpriv;
630 if (phtpriv->ht_option == 1) { /*B/G/N Mode*/
631 if (recv_indicatepkt_reorder(padapter, prframe)) {
632 /* including perform A-MPDU Rx Ordering Buffer Control*/
633 if (!padapter->driver_stopped &&
634 !padapter->surprise_removed)
637 } else { /*B/G mode*/
638 retval = r8712_wlanhdr_to_ethhdr(prframe);
641 if (!padapter->driver_stopped && !padapter->surprise_removed) {
642 /* indicate this recv_frame */
643 r8712_recv_indicatepkt(padapter, prframe);
651 static u8 query_rx_pwr_percentage(s8 antpower)
653 if ((antpower <= -100) || (antpower >= 20))
655 else if (antpower >= 0)
658 return 100 + antpower;
661 static u8 evm_db2percentage(s8 value)
664 * -33dB~0dB to 0%~99%
680 s32 r8712_signal_scale_mapping(s32 cur_sig)
684 if (cur_sig >= 51 && cur_sig <= 100)
686 else if (cur_sig >= 41 && cur_sig <= 50)
687 ret_sig = 80 + ((cur_sig - 40) * 2);
688 else if (cur_sig >= 31 && cur_sig <= 40)
689 ret_sig = 66 + (cur_sig - 30);
690 else if (cur_sig >= 21 && cur_sig <= 30)
691 ret_sig = 54 + (cur_sig - 20);
692 else if (cur_sig >= 10 && cur_sig <= 20)
693 ret_sig = 42 + (((cur_sig - 10) * 2) / 3);
694 else if (cur_sig >= 5 && cur_sig <= 9)
695 ret_sig = 22 + (((cur_sig - 5) * 3) / 2);
696 else if (cur_sig >= 1 && cur_sig <= 4)
697 ret_sig = 6 + (((cur_sig - 1) * 3) / 2);
703 static s32 translate2dbm(struct _adapter *padapter, u8 signal_strength_idx)
705 s32 signal_power; /* in dBm.*/
706 /* Translate to dBm (x=0.5y-95).*/
707 signal_power = (s32)((signal_strength_idx + 1) >> 1);
712 static void query_rx_phy_status(struct _adapter *padapter,
713 union recv_frame *prframe)
715 u8 i, max_spatial_stream, evm;
716 struct recv_stat *prxstat = (struct recv_stat *)prframe->u.hdr.rx_head;
717 struct phy_stat *pphy_stat = (struct phy_stat *)(prxstat + 1);
718 u8 *pphy_head = (u8 *)(prxstat + 1);
719 s8 rx_pwr[4], rx_pwr_all;
721 u32 rssi, total_rssi = 0;
722 u8 bcck_rate = 0, rf_rx_num = 0, cck_highpwr = 0;
723 struct phy_cck_rx_status *pcck_buf;
726 /* Record it for next packet processing*/
727 bcck_rate = (prframe->u.hdr.attrib.mcs_rate <= 3 ? 1 : 0);
731 /* CCK Driver info Structure is not the same as OFDM packet.*/
732 pcck_buf = (struct phy_cck_rx_status *)pphy_stat;
733 /* (1)Hardware does not provide RSSI for CCK
734 * (2)PWDB, Average PWDB calculated by hardware
735 * (for rate adaptive)
738 report = pcck_buf->cck_agc_rpt & 0xc0;
741 /* Modify the RF RNA gain value to -40, -20,
742 * -2, 14 by Jenyu's suggestion
743 * Note: different RF with the different
747 rx_pwr_all = -40 - (pcck_buf->cck_agc_rpt &
751 rx_pwr_all = -20 - (pcck_buf->cck_agc_rpt &
755 rx_pwr_all = -2 - (pcck_buf->cck_agc_rpt &
759 rx_pwr_all = 14 - (pcck_buf->cck_agc_rpt &
764 report = ((u8)(le32_to_cpu(pphy_stat->phydw1) >> 8)) &
769 rx_pwr_all = -40 - ((pcck_buf->cck_agc_rpt &
773 rx_pwr_all = -20 - ((pcck_buf->cck_agc_rpt &
777 rx_pwr_all = -2 - ((pcck_buf->cck_agc_rpt &
781 rx_pwr_all = 14 - ((pcck_buf->cck_agc_rpt &
786 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
787 /* CCK gain is smaller than OFDM/MCS gain,*/
788 /* so we add gain diff by experiences, the val is 6 */
792 /* modify the offset to make the same gain index with OFDM.*/
793 if (pwdb_all > 34 && pwdb_all <= 42)
795 else if (pwdb_all > 26 && pwdb_all <= 34)
797 else if (pwdb_all > 14 && pwdb_all <= 26)
799 else if (pwdb_all > 4 && pwdb_all <= 14)
802 * (3) Get Signal Quality (EVM)
807 sq = pcck_buf->sq_rpt;
808 if (pcck_buf->sq_rpt > 64)
810 else if (pcck_buf->sq_rpt < 20)
813 sq = ((64 - sq) * 100) / 44;
815 prframe->u.hdr.attrib.signal_qual = sq;
816 prframe->u.hdr.attrib.rx_mimo_signal_qual[0] = sq;
817 prframe->u.hdr.attrib.rx_mimo_signal_qual[1] = -1;
819 /* (1)Get RSSI for HT rate */
820 for (i = 0; i < ((padapter->registrypriv.rf_config) &
823 rx_pwr[i] = ((pphy_head[PHY_STAT_GAIN_TRSW_SHT + i]
825 /* Translate DBM to percentage. */
826 rssi = query_rx_pwr_percentage(rx_pwr[i]);
829 /* (2)PWDB, Average PWDB calculated by hardware (for
832 rx_pwr_all = (((pphy_head[PHY_STAT_PWDB_ALL_SHT]) >> 1) & 0x7f)
834 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
837 /* (3)EVM of HT rate */
838 if (prframe->u.hdr.attrib.htc &&
839 prframe->u.hdr.attrib.mcs_rate >= 20 &&
840 prframe->u.hdr.attrib.mcs_rate <= 27) {
841 /* both spatial stream make sense */
842 max_spatial_stream = 2;
844 /* only spatial stream 1 makes sense */
845 max_spatial_stream = 1;
847 for (i = 0; i < max_spatial_stream; i++) {
848 evm = evm_db2percentage((pphy_head
849 [PHY_STAT_RXEVM_SHT + i]));/*dbm*/
850 prframe->u.hdr.attrib.signal_qual =
852 prframe->u.hdr.attrib.rx_mimo_signal_qual[i] =
857 /* UI BSS List signal strength(in percentage), make it good looking,
858 * from 0~100. It is assigned to the BSS List in
859 * GetValueFromBeaconOrProbeRsp().
862 prframe->u.hdr.attrib.signal_strength =
863 (u8)r8712_signal_scale_mapping(pwdb_all);
866 prframe->u.hdr.attrib.signal_strength =
867 (u8)(r8712_signal_scale_mapping(total_rssi /=
872 static void process_link_qual(struct _adapter *padapter,
873 union recv_frame *prframe)
875 u32 last_evm = 0, tmpVal;
876 struct rx_pkt_attrib *pattrib;
877 struct smooth_rssi_data *sqd = &padapter->recvpriv.signal_qual_data;
879 if (!prframe || !padapter)
881 pattrib = &prframe->u.hdr.attrib;
882 if (pattrib->signal_qual != 0) {
884 * 1. Record the general EVM to the sliding window.
886 if (sqd->total_num++ >= PHY_LINKQUALITY_SLID_WIN_MAX) {
887 sqd->total_num = PHY_LINKQUALITY_SLID_WIN_MAX;
888 last_evm = sqd->elements[sqd->index];
889 sqd->total_val -= last_evm;
891 sqd->total_val += pattrib->signal_qual;
892 sqd->elements[sqd->index++] = pattrib->signal_qual;
893 if (sqd->index >= PHY_LINKQUALITY_SLID_WIN_MAX)
896 /* <1> Showed on UI for user, in percentage. */
897 tmpVal = sqd->total_val / sqd->total_num;
898 padapter->recvpriv.signal = (u8)tmpVal;
902 static void process_rssi(struct _adapter *padapter, union recv_frame *prframe)
904 u32 last_rssi, tmp_val;
905 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
906 struct smooth_rssi_data *ssd = &padapter->recvpriv.signal_strength_data;
908 if (ssd->total_num++ >= PHY_RSSI_SLID_WIN_MAX) {
909 ssd->total_num = PHY_RSSI_SLID_WIN_MAX;
910 last_rssi = ssd->elements[ssd->index];
911 ssd->total_val -= last_rssi;
913 ssd->total_val += pattrib->signal_strength;
914 ssd->elements[ssd->index++] = pattrib->signal_strength;
915 if (ssd->index >= PHY_RSSI_SLID_WIN_MAX)
917 tmp_val = ssd->total_val / ssd->total_num;
918 padapter->recvpriv.rssi = (s8)translate2dbm(padapter, (u8)tmp_val);
921 static void process_phy_info(struct _adapter *padapter,
922 union recv_frame *prframe)
924 query_rx_phy_status(padapter, prframe);
925 process_rssi(padapter, prframe);
926 process_link_qual(padapter, prframe);
929 int recv_func(struct _adapter *padapter, void *pcontext)
931 struct rx_pkt_attrib *pattrib;
932 union recv_frame *prframe, *orig_prframe;
933 int retval = _SUCCESS;
934 struct __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
935 struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
938 orig_prframe = prframe;
939 pattrib = &prframe->u.hdr.attrib;
940 if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
941 if (pattrib->crc_err == 1)
942 padapter->mppriv.rx_crcerrpktcount++;
944 padapter->mppriv.rx_pktcount++;
945 if (!check_fwstate(pmlmepriv, WIFI_MP_LPBK_STATE)) {
946 /* free this recv_frame */
947 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
948 goto _exit_recv_func;
951 /* check the frame crtl field and decache */
952 retval = r8712_validate_recv_frame(padapter, prframe);
953 if (retval != _SUCCESS) {
954 /* free this recv_frame */
955 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
956 goto _exit_recv_func;
958 process_phy_info(padapter, prframe);
959 prframe = r8712_decryptor(padapter, prframe);
962 goto _exit_recv_func;
964 prframe = r8712_recvframe_chk_defrag(padapter, prframe);
966 goto _exit_recv_func;
967 prframe = r8712_portctrl(padapter, prframe);
970 goto _exit_recv_func;
972 retval = r8712_process_recv_indicatepkts(padapter, prframe);
973 if (retval != _SUCCESS) {
974 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
975 goto _exit_recv_func;
981 static void recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
983 u8 *pbuf, shift_sz = 0;
987 struct recv_stat *prxstat;
988 u16 pkt_cnt, drvinfo_sz, pkt_offset, tmp_len, alloc_sz;
989 struct __queue *pfree_recv_queue;
990 _pkt *pkt_copy = NULL;
991 union recv_frame *precvframe = NULL;
992 struct recv_priv *precvpriv = &padapter->recvpriv;
994 pfree_recv_queue = &(precvpriv->free_recv_queue);
996 prxstat = (struct recv_stat *)pbuf;
997 pkt_cnt = (le32_to_cpu(prxstat->rxdw2) >> 16) & 0xff;
998 pkt_len = le32_to_cpu(prxstat->rxdw0) & 0x00003fff;
999 transfer_len = pskb->len;
1000 /* Test throughput with Netgear 3700 (No security) with Chariot 3T3R
1001 * pairs. The packet count will be a big number so that the containing
1002 * packet will effect the Rx reordering.
1004 if (transfer_len < pkt_len) {
1005 /* In this case, it means the MAX_RECVBUF_SZ is too small to
1006 * get the data from 8712u.
1011 prxstat = (struct recv_stat *)pbuf;
1012 pkt_len = le32_to_cpu(prxstat->rxdw0) & 0x00003fff;
1013 /* more fragment bit */
1014 mf = (le32_to_cpu(prxstat->rxdw1) >> 27) & 0x1;
1015 /* ragmentation number */
1016 frag = (le32_to_cpu(prxstat->rxdw2) >> 12) & 0xf;
1017 /* uint 2^3 = 8 bytes */
1018 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
1022 /* Qos data, wireless lan header length is 26 */
1023 if ((le32_to_cpu(prxstat->rxdw0) >> 23) & 0x01)
1025 precvframe = r8712_alloc_recvframe(pfree_recv_queue);
1028 INIT_LIST_HEAD(&precvframe->u.hdr.list);
1029 precvframe->u.hdr.precvbuf = NULL; /*can't access the precvbuf*/
1030 precvframe->u.hdr.len = 0;
1031 tmp_len = pkt_len + drvinfo_sz + RXDESC_SIZE;
1032 pkt_offset = (u16)round_up(tmp_len, 128);
1033 /* for first fragment packet, driver need allocate 1536 +
1034 * drvinfo_sz + RXDESC_SIZE to defrag packet.
1036 if ((mf == 1) && (frag == 0))
1037 /*1658+6=1664, 1664 is 128 alignment.*/
1038 alloc_sz = max_t(u16, tmp_len, 1658);
1041 /* 2 is for IP header 4 bytes alignment in QoS packet case.
1042 * 4 is for skb->data 4 bytes alignment.
1045 pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz);
1047 precvframe->u.hdr.pkt = pkt_copy;
1048 skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data)
1050 skb_reserve(pkt_copy, shift_sz);
1051 memcpy(pkt_copy->data, pbuf, tmp_len);
1052 precvframe->u.hdr.rx_head = precvframe->u.hdr.rx_data =
1053 precvframe->u.hdr.rx_tail = pkt_copy->data;
1054 precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
1056 precvframe->u.hdr.pkt = skb_clone(pskb, GFP_ATOMIC);
1057 if (!precvframe->u.hdr.pkt)
1059 precvframe->u.hdr.rx_head = pbuf;
1060 precvframe->u.hdr.rx_data = pbuf;
1061 precvframe->u.hdr.rx_tail = pbuf;
1062 precvframe->u.hdr.rx_end = pbuf + alloc_sz;
1064 recvframe_put(precvframe, tmp_len);
1065 recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE);
1066 /* because the endian issue, driver avoid reference to the
1067 * rxstat after calling update_recvframe_attrib_from_recvstat();
1069 update_recvframe_attrib_from_recvstat(&precvframe->u.hdr.attrib,
1071 r8712_recv_entry(precvframe);
1072 transfer_len -= pkt_offset;
1077 } while ((transfer_len > 0) && pkt_cnt > 0);
1080 static void recv_tasklet(unsigned long priv)
1082 struct sk_buff *pskb;
1083 struct _adapter *padapter = (struct _adapter *)priv;
1084 struct recv_priv *precvpriv = &padapter->recvpriv;
1086 while (NULL != (pskb = skb_dequeue(&precvpriv->rx_skb_queue))) {
1087 recvbuf2recvframe(padapter, pskb);
1088 skb_reset_tail_pointer(pskb);
1090 if (!skb_cloned(pskb))
1091 skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);