1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * This file is part of wl1271
4 *
5 * Copyright (C) 2009 Nokia Corporation
6 *
7 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
8 */
9
10#include <linux/gfp.h>
11#include <linux/sched.h>
12
13#include "wlcore.h"
14#include "debug.h"
15#include "acx.h"
16#include "rx.h"
17#include "tx.h"
18#include "io.h"
19#include "hw_ops.h"
20
21/*
22 * TODO: this is here just for now, it must be removed when the data
23 * operations are in place.
24 */
25#include "../wl12xx/reg.h"
26
27static u32 wlcore_rx_get_buf_size(struct wl1271 *wl,
28				  u32 rx_pkt_desc)
29{
30	if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN)
31		return (rx_pkt_desc & ALIGNED_RX_BUF_SIZE_MASK) >>
32		       ALIGNED_RX_BUF_SIZE_SHIFT;
33
34	return (rx_pkt_desc & RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
35}
36
37static u32 wlcore_rx_get_align_buf_size(struct wl1271 *wl, u32 pkt_len)
38{
39	if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN)
40		return ALIGN(pkt_len, WL12XX_BUS_BLOCK_SIZE);
41
42	return pkt_len;
43}
44
45static void wl1271_rx_status(struct wl1271 *wl,
46			     struct wl1271_rx_descriptor *desc,
47			     struct ieee80211_rx_status *status,
48			     u8 beacon, u8 probe_rsp)
49{
50	memset(status, 0, sizeof(struct ieee80211_rx_status));
51
52	if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG)
53		status->band = NL80211_BAND_2GHZ;
54	else
55		status->band = NL80211_BAND_5GHZ;
56
57	status->rate_idx = wlcore_rate_to_idx(wl, desc->rate, status->band);
58
59	/* 11n support */
60	if (desc->rate <= wl->hw_min_ht_rate)
61		status->encoding = RX_ENC_HT;
62
63	/*
64	* Read the signal level and antenna diversity indication.
65	* The msb in the signal level is always set as it is a
66	* negative number.
67	* The antenna indication is the msb of the rssi.
68	*/
69	status->signal = ((desc->rssi & RSSI_LEVEL_BITMASK) | BIT(7));
70	status->antenna = ((desc->rssi & ANT_DIVERSITY_BITMASK) >> 7);
71
72	/*
73	 * FIXME: In wl1251, the SNR should be divided by two.  In wl1271 we
74	 * need to divide by two for now, but TI has been discussing about
75	 * changing it.  This needs to be rechecked.
76	 */
77	wl->noise = desc->rssi - (desc->snr >> 1);
78
79	status->freq = ieee80211_channel_to_frequency(desc->channel,
80						      status->band);
81
82	if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
83		u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK;
84
85		status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED |
86				RX_FLAG_DECRYPTED;
87
88		if (unlikely(desc_err_code & WL1271_RX_DESC_MIC_FAIL)) {
89			status->flag |= RX_FLAG_MMIC_ERROR;
90			wl1271_warning("Michael MIC error. Desc: 0x%x",
91				       desc_err_code);
92		}
93	}
94
95	if (beacon || probe_rsp)
96		status->boottime_ns = ktime_get_boottime_ns();
97
98	if (beacon)
99		wlcore_set_pending_regdomain_ch(wl, (u16)desc->channel,
100						status->band);
101}
102
103static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length,
104				 enum wl_rx_buf_align rx_align, u8 *hlid)
105{
106	struct wl1271_rx_descriptor *desc;
107	struct sk_buff *skb;
108	struct ieee80211_hdr *hdr;
109	u8 beacon = 0;
110	u8 is_data = 0;
111	u8 reserved = 0, offset_to_data = 0;
112	u16 seq_num;
113	u32 pkt_data_len;
114
115	/*
116	 * In PLT mode we seem to get frames and mac80211 warns about them,
117	 * workaround this by not retrieving them at all.
118	 */
119	if (unlikely(wl->plt))
120		return -EINVAL;
121
122	pkt_data_len = wlcore_hw_get_rx_packet_len(wl, data, length);
123	if (!pkt_data_len) {
124		wl1271_error("Invalid packet arrived from HW. length %d",
125			     length);
126		return -EINVAL;
127	}
128
129	if (rx_align == WLCORE_RX_BUF_UNALIGNED)
130		reserved = RX_BUF_ALIGN;
131	else if (rx_align == WLCORE_RX_BUF_PADDED)
132		offset_to_data = RX_BUF_ALIGN;
133
134	/* the data read starts with the descriptor */
135	desc = (struct wl1271_rx_descriptor *) data;
136
137	if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) {
138		size_t len = length - sizeof(*desc);
139		wl12xx_copy_fwlog(wl, data + sizeof(*desc), len);
140		return 0;
141	}
142
143	/* discard corrupted packets */
144	if (desc->status & WL1271_RX_DESC_DECRYPT_FAIL) {
145		hdr = (void *)(data + sizeof(*desc) + offset_to_data);
146		wl1271_warning("corrupted packet in RX: status: 0x%x len: %d",
147			       desc->status & WL1271_RX_DESC_STATUS_MASK,
148			       pkt_data_len);
149		wl1271_dump((DEBUG_RX|DEBUG_CMD), "PKT: ", data + sizeof(*desc),
150			    min(pkt_data_len,
151				ieee80211_hdrlen(hdr->frame_control)));
152		return -EINVAL;
153	}
154
155	/* skb length not including rx descriptor */
156	skb = __dev_alloc_skb(pkt_data_len + reserved, GFP_KERNEL);
157	if (!skb) {
158		wl1271_error("Couldn't allocate RX frame");
159		return -ENOMEM;
160	}
161
162	/* reserve the unaligned payload(if any) */
163	skb_reserve(skb, reserved);
164
165	/*
166	 * Copy packets from aggregation buffer to the skbs without rx
167	 * descriptor and with packet payload aligned care. In case of unaligned
168	 * packets copy the packets in offset of 2 bytes guarantee IP header
169	 * payload aligned to 4 bytes.
170	 */
171	skb_put_data(skb, data + sizeof(*desc), pkt_data_len);
172	if (rx_align == WLCORE_RX_BUF_PADDED)
173		skb_pull(skb, RX_BUF_ALIGN);
174
175	*hlid = desc->hlid;
176
177	hdr = (struct ieee80211_hdr *)skb->data;
178	if (ieee80211_is_beacon(hdr->frame_control))
179		beacon = 1;
180	if (ieee80211_is_data_present(hdr->frame_control))
181		is_data = 1;
182
183	wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon,
184			 ieee80211_is_probe_resp(hdr->frame_control));
185	wlcore_hw_set_rx_csum(wl, desc, skb);
186
187	seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4;
188	wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb,
189		     skb->len - desc->pad_len,
190		     beacon ? "beacon" : "",
191		     seq_num, *hlid);
192
193	skb_queue_tail(&wl->deferred_rx_queue, skb);
194	queue_work(wl->freezable_wq, &wl->netstack_work);
195
196	return is_data;
197}
198
199int wlcore_rx(struct wl1271 *wl, struct wl_fw_status *status)
200{
201	unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0};
202	u32 buf_size;
203	u32 fw_rx_counter = status->fw_rx_counter % wl->num_rx_desc;
204	u32 drv_rx_counter = wl->rx_counter % wl->num_rx_desc;
205	u32 rx_counter;
206	u32 pkt_len, align_pkt_len;
207	u32 pkt_offset, des;
208	u8 hlid;
209	enum wl_rx_buf_align rx_align;
210	int ret = 0;
211
212	/* update rates per link */
213	hlid = status->counters.hlid;
214
215	if (hlid < WLCORE_MAX_LINKS)
216		wl->links[hlid].fw_rate_mbps =
217				status->counters.tx_last_rate_mbps;
218
219	while (drv_rx_counter != fw_rx_counter) {
220		buf_size = 0;
221		rx_counter = drv_rx_counter;
222		while (rx_counter != fw_rx_counter) {
223			des = le32_to_cpu(status->rx_pkt_descs[rx_counter]);
224			pkt_len = wlcore_rx_get_buf_size(wl, des);
225			align_pkt_len = wlcore_rx_get_align_buf_size(wl,
226								     pkt_len);
227			if (buf_size + align_pkt_len > wl->aggr_buf_size)
228				break;
229			buf_size += align_pkt_len;
230			rx_counter++;
231			rx_counter %= wl->num_rx_desc;
232		}
233
234		if (buf_size == 0) {
235			wl1271_warning("received empty data");
236			break;
237		}
238
239		/* Read all available packets at once */
240		des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
241		ret = wlcore_hw_prepare_read(wl, des, buf_size);
242		if (ret < 0)
243			goto out;
244
245		ret = wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
246				       buf_size, true);
247		if (ret < 0)
248			goto out;
249
250		/* Split data into separate packets */
251		pkt_offset = 0;
252		while (pkt_offset < buf_size) {
253			des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
254			pkt_len = wlcore_rx_get_buf_size(wl, des);
255			rx_align = wlcore_hw_get_rx_buf_align(wl, des);
256
257			/*
258			 * the handle data call can only fail in memory-outage
259			 * conditions, in that case the received frame will just
260			 * be dropped.
261			 */
262			if (wl1271_rx_handle_data(wl,
263						  wl->aggr_buf + pkt_offset,
264						  pkt_len, rx_align,
265						  &hlid) == 1) {
266				if (hlid < wl->num_links)
267					__set_bit(hlid, active_hlids);
268				else
269					WARN(1,
270					     "hlid (%d) exceeded MAX_LINKS\n",
271					     hlid);
272			}
273
274			wl->rx_counter++;
275			drv_rx_counter++;
276			drv_rx_counter %= wl->num_rx_desc;
277			pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len);
278		}
279	}
280
281	/*
282	 * Write the driver's packet counter to the FW. This is only required
283	 * for older hardware revisions
284	 */
285	if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
286		ret = wlcore_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER,
287				     wl->rx_counter);
288		if (ret < 0)
289			goto out;
290	}
291
292	wl12xx_rearm_rx_streaming(wl, active_hlids);
293
294out:
295	return ret;
296}
297
298#ifdef CONFIG_PM
299int wl1271_rx_filter_enable(struct wl1271 *wl,
300			    int index, bool enable,
301			    struct wl12xx_rx_filter *filter)
302{
303	int ret;
304
305	if (!!test_bit(index, wl->rx_filter_enabled) == enable) {
306		wl1271_warning("Request to enable an already "
307			     "enabled rx filter %d", index);
308		return 0;
309	}
310
311	ret = wl1271_acx_set_rx_filter(wl, index, enable, filter);
312
313	if (ret) {
314		wl1271_error("Failed to %s rx data filter %d (err=%d)",
315			     enable ? "enable" : "disable", index, ret);
316		return ret;
317	}
318
319	if (enable)
320		__set_bit(index, wl->rx_filter_enabled);
321	else
322		__clear_bit(index, wl->rx_filter_enabled);
323
324	return 0;
325}
326
327int wl1271_rx_filter_clear_all(struct wl1271 *wl)
328{
329	int i, ret = 0;
330
331	for (i = 0; i < WL1271_MAX_RX_FILTERS; i++) {
332		if (!test_bit(i, wl->rx_filter_enabled))
333			continue;
334		ret = wl1271_rx_filter_enable(wl, i, 0, NULL);
335		if (ret)
336			goto out;
337	}
338
339out:
340	return ret;
341}
342#endif /* CONFIG_PM */
343