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
wlcore_rx_get_buf_size(struct wl1271 * wl,u32 rx_pkt_desc)27 static 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
wlcore_rx_get_align_buf_size(struct wl1271 * wl,u32 pkt_len)37 static 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
wl1271_rx_status(struct wl1271 * wl,struct wl1271_rx_descriptor * desc,struct ieee80211_rx_status * status,u8 beacon,u8 probe_rsp)45 static 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
wl1271_rx_handle_data(struct wl1271 * wl,u8 * data,u32 length,enum wl_rx_buf_align rx_align,u8 * hlid)103 static 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
wlcore_rx(struct wl1271 * wl,struct wl_fw_status * status)199 int 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
294 out:
295 return ret;
296 }
297
298 #ifdef CONFIG_PM
wl1271_rx_filter_enable(struct wl1271 * wl,int index,bool enable,struct wl12xx_rx_filter * filter)299 int 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
wl1271_rx_filter_clear_all(struct wl1271 * wl)327 int 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
339 out:
340 return ret;
341 }
342 #endif /* CONFIG_PM */
343
