diff options
author | Jonathan Herman <hermanjl@cs.unc.edu> | 2013-01-22 10:38:37 -0500 |
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committer | Jonathan Herman <hermanjl@cs.unc.edu> | 2013-01-22 10:38:37 -0500 |
commit | fcc9d2e5a6c89d22b8b773a64fb4ad21ac318446 (patch) | |
tree | a57612d1888735a2ec7972891b68c1ac5ec8faea /drivers/net/wireless/wl12xx/rx.c | |
parent | 8dea78da5cee153b8af9c07a2745f6c55057fe12 (diff) |
Diffstat (limited to 'drivers/net/wireless/wl12xx/rx.c')
-rw-r--r-- | drivers/net/wireless/wl12xx/rx.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/drivers/net/wireless/wl12xx/rx.c b/drivers/net/wireless/wl12xx/rx.c new file mode 100644 index 00000000000..0450fb49dbb --- /dev/null +++ b/drivers/net/wireless/wl12xx/rx.c | |||
@@ -0,0 +1,273 @@ | |||
1 | /* | ||
2 | * This file is part of wl1271 | ||
3 | * | ||
4 | * Copyright (C) 2009 Nokia Corporation | ||
5 | * | ||
6 | * Contact: Luciano Coelho <luciano.coelho@nokia.com> | ||
7 | * | ||
8 | * This program is free software; you can redistribute it and/or | ||
9 | * modify it under the terms of the GNU General Public License | ||
10 | * version 2 as published by the Free Software Foundation. | ||
11 | * | ||
12 | * This program is distributed in the hope that it will be useful, but | ||
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | ||
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
15 | * General Public License for more details. | ||
16 | * | ||
17 | * You should have received a copy of the GNU General Public License | ||
18 | * along with this program; if not, write to the Free Software | ||
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | ||
20 | * 02110-1301 USA | ||
21 | * | ||
22 | */ | ||
23 | |||
24 | #include <linux/gfp.h> | ||
25 | #include <linux/sched.h> | ||
26 | |||
27 | #include "wl12xx.h" | ||
28 | #include "acx.h" | ||
29 | #include "reg.h" | ||
30 | #include "rx.h" | ||
31 | #include "io.h" | ||
32 | |||
33 | static u8 wl1271_rx_get_mem_block(struct wl1271_fw_common_status *status, | ||
34 | u32 drv_rx_counter) | ||
35 | { | ||
36 | return le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) & | ||
37 | RX_MEM_BLOCK_MASK; | ||
38 | } | ||
39 | |||
40 | static u32 wl1271_rx_get_buf_size(struct wl1271_fw_common_status *status, | ||
41 | u32 drv_rx_counter) | ||
42 | { | ||
43 | return (le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) & | ||
44 | RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV; | ||
45 | } | ||
46 | |||
47 | static void wl1271_rx_status(struct wl1271 *wl, | ||
48 | struct wl1271_rx_descriptor *desc, | ||
49 | struct ieee80211_rx_status *status, | ||
50 | u8 beacon) | ||
51 | { | ||
52 | memset(status, 0, sizeof(struct ieee80211_rx_status)); | ||
53 | |||
54 | if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG) | ||
55 | status->band = IEEE80211_BAND_2GHZ; | ||
56 | else | ||
57 | status->band = IEEE80211_BAND_5GHZ; | ||
58 | |||
59 | status->rate_idx = wl1271_rate_to_idx(desc->rate, status->band); | ||
60 | |||
61 | #ifdef CONFIG_WL12XX_HT | ||
62 | /* 11n support */ | ||
63 | if (desc->rate <= CONF_HW_RXTX_RATE_MCS0) | ||
64 | status->flag |= RX_FLAG_HT; | ||
65 | #endif | ||
66 | |||
67 | status->signal = desc->rssi; | ||
68 | |||
69 | /* | ||
70 | * FIXME: In wl1251, the SNR should be divided by two. In wl1271 we | ||
71 | * need to divide by two for now, but TI has been discussing about | ||
72 | * changing it. This needs to be rechecked. | ||
73 | */ | ||
74 | wl->noise = desc->rssi - (desc->snr >> 1); | ||
75 | |||
76 | status->freq = ieee80211_channel_to_frequency(desc->channel, | ||
77 | status->band); | ||
78 | |||
79 | if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) { | ||
80 | u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK; | ||
81 | |||
82 | status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED | | ||
83 | RX_FLAG_DECRYPTED; | ||
84 | |||
85 | if (unlikely(desc_err_code == WL1271_RX_DESC_MIC_FAIL)) { | ||
86 | status->flag |= RX_FLAG_MMIC_ERROR; | ||
87 | wl1271_warning("Michael MIC error"); | ||
88 | } | ||
89 | } | ||
90 | } | ||
91 | |||
92 | static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length) | ||
93 | { | ||
94 | struct wl1271_rx_descriptor *desc; | ||
95 | struct sk_buff *skb; | ||
96 | struct ieee80211_hdr *hdr; | ||
97 | u8 *buf; | ||
98 | u8 beacon = 0; | ||
99 | u8 is_data = 0; | ||
100 | |||
101 | /* | ||
102 | * In PLT mode we seem to get frames and mac80211 warns about them, | ||
103 | * workaround this by not retrieving them at all. | ||
104 | */ | ||
105 | if (unlikely(wl->state == WL1271_STATE_PLT)) | ||
106 | return -EINVAL; | ||
107 | |||
108 | /* the data read starts with the descriptor */ | ||
109 | desc = (struct wl1271_rx_descriptor *) data; | ||
110 | |||
111 | if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) { | ||
112 | size_t len = length - sizeof(*desc); | ||
113 | wl12xx_copy_fwlog(wl, data + sizeof(*desc), len); | ||
114 | wake_up_interruptible(&wl->fwlog_waitq); | ||
115 | return 0; | ||
116 | } | ||
117 | |||
118 | switch (desc->status & WL1271_RX_DESC_STATUS_MASK) { | ||
119 | /* discard corrupted packets */ | ||
120 | case WL1271_RX_DESC_DRIVER_RX_Q_FAIL: | ||
121 | case WL1271_RX_DESC_DECRYPT_FAIL: | ||
122 | wl1271_warning("corrupted packet in RX with status: 0x%x", | ||
123 | desc->status & WL1271_RX_DESC_STATUS_MASK); | ||
124 | return -EINVAL; | ||
125 | case WL1271_RX_DESC_SUCCESS: | ||
126 | case WL1271_RX_DESC_MIC_FAIL: | ||
127 | break; | ||
128 | default: | ||
129 | wl1271_error("invalid RX descriptor status: 0x%x", | ||
130 | desc->status & WL1271_RX_DESC_STATUS_MASK); | ||
131 | return -EINVAL; | ||
132 | } | ||
133 | |||
134 | skb = __dev_alloc_skb(length, GFP_KERNEL); | ||
135 | if (!skb) { | ||
136 | wl1271_error("Couldn't allocate RX frame"); | ||
137 | return -ENOMEM; | ||
138 | } | ||
139 | |||
140 | buf = skb_put(skb, length); | ||
141 | memcpy(buf, data, length); | ||
142 | |||
143 | /* now we pull the descriptor out of the buffer */ | ||
144 | skb_pull(skb, sizeof(*desc)); | ||
145 | |||
146 | hdr = (struct ieee80211_hdr *)skb->data; | ||
147 | if (ieee80211_is_beacon(hdr->frame_control)) | ||
148 | beacon = 1; | ||
149 | if (ieee80211_is_data_present(hdr->frame_control)) | ||
150 | is_data = 1; | ||
151 | |||
152 | wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon); | ||
153 | |||
154 | wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, | ||
155 | skb->len - desc->pad_len, | ||
156 | beacon ? "beacon" : ""); | ||
157 | |||
158 | skb_trim(skb, skb->len - desc->pad_len); | ||
159 | |||
160 | skb_queue_tail(&wl->deferred_rx_queue, skb); | ||
161 | queue_work(wl->freezable_wq, &wl->netstack_work); | ||
162 | |||
163 | return is_data; | ||
164 | } | ||
165 | |||
166 | void wl1271_rx(struct wl1271 *wl, struct wl1271_fw_common_status *status) | ||
167 | { | ||
168 | struct wl1271_acx_mem_map *wl_mem_map = wl->target_mem_map; | ||
169 | u32 buf_size; | ||
170 | u32 fw_rx_counter = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK; | ||
171 | u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK; | ||
172 | u32 rx_counter; | ||
173 | u32 mem_block; | ||
174 | u32 pkt_length; | ||
175 | u32 pkt_offset; | ||
176 | bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS); | ||
177 | bool had_data = false; | ||
178 | |||
179 | while (drv_rx_counter != fw_rx_counter) { | ||
180 | buf_size = 0; | ||
181 | rx_counter = drv_rx_counter; | ||
182 | while (rx_counter != fw_rx_counter) { | ||
183 | pkt_length = wl1271_rx_get_buf_size(status, rx_counter); | ||
184 | if (buf_size + pkt_length > WL1271_AGGR_BUFFER_SIZE) | ||
185 | break; | ||
186 | buf_size += pkt_length; | ||
187 | rx_counter++; | ||
188 | rx_counter &= NUM_RX_PKT_DESC_MOD_MASK; | ||
189 | } | ||
190 | |||
191 | if (buf_size == 0) { | ||
192 | wl1271_warning("received empty data"); | ||
193 | break; | ||
194 | } | ||
195 | |||
196 | if (wl->chip.id != CHIP_ID_1283_PG20) { | ||
197 | /* | ||
198 | * Choose the block we want to read | ||
199 | * For aggregated packets, only the first memory block | ||
200 | * should be retrieved. The FW takes care of the rest. | ||
201 | */ | ||
202 | mem_block = wl1271_rx_get_mem_block(status, | ||
203 | drv_rx_counter); | ||
204 | |||
205 | wl->rx_mem_pool_addr.addr = (mem_block << 8) + | ||
206 | le32_to_cpu(wl_mem_map->packet_memory_pool_start); | ||
207 | |||
208 | wl->rx_mem_pool_addr.addr_extra = | ||
209 | wl->rx_mem_pool_addr.addr + 4; | ||
210 | |||
211 | wl1271_write(wl, WL1271_SLV_REG_DATA, | ||
212 | &wl->rx_mem_pool_addr, | ||
213 | sizeof(wl->rx_mem_pool_addr), false); | ||
214 | } | ||
215 | |||
216 | /* Read all available packets at once */ | ||
217 | wl1271_read(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf, | ||
218 | buf_size, true); | ||
219 | |||
220 | /* Split data into separate packets */ | ||
221 | pkt_offset = 0; | ||
222 | while (pkt_offset < buf_size) { | ||
223 | pkt_length = wl1271_rx_get_buf_size(status, | ||
224 | drv_rx_counter); | ||
225 | /* | ||
226 | * the handle data call can only fail in memory-outage | ||
227 | * conditions, in that case the received frame will just | ||
228 | * be dropped. | ||
229 | */ | ||
230 | if (wl1271_rx_handle_data(wl, | ||
231 | wl->aggr_buf + pkt_offset, | ||
232 | pkt_length) == 1) | ||
233 | had_data = true; | ||
234 | |||
235 | wl->rx_counter++; | ||
236 | drv_rx_counter++; | ||
237 | drv_rx_counter &= NUM_RX_PKT_DESC_MOD_MASK; | ||
238 | pkt_offset += pkt_length; | ||
239 | } | ||
240 | } | ||
241 | |||
242 | /* | ||
243 | * Write the driver's packet counter to the FW. This is only required | ||
244 | * for older hardware revisions | ||
245 | */ | ||
246 | if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION) | ||
247 | wl1271_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter); | ||
248 | |||
249 | if (!is_ap && wl->conf.rx_streaming.interval && had_data && | ||
250 | (wl->conf.rx_streaming.always || | ||
251 | test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))) { | ||
252 | u32 timeout = wl->conf.rx_streaming.duration; | ||
253 | |||
254 | /* restart rx streaming */ | ||
255 | if (!test_bit(WL1271_FLAG_RX_STREAMING_STARTED, &wl->flags)) | ||
256 | ieee80211_queue_work(wl->hw, | ||
257 | &wl->rx_streaming_enable_work); | ||
258 | |||
259 | mod_timer(&wl->rx_streaming_timer, | ||
260 | jiffies + msecs_to_jiffies(timeout)); | ||
261 | } | ||
262 | } | ||
263 | |||
264 | void wl1271_set_default_filters(struct wl1271 *wl) | ||
265 | { | ||
266 | if (wl->bss_type == BSS_TYPE_AP_BSS) { | ||
267 | wl->rx_config = WL1271_DEFAULT_AP_RX_CONFIG; | ||
268 | wl->rx_filter = WL1271_DEFAULT_AP_RX_FILTER; | ||
269 | } else { | ||
270 | wl->rx_config = WL1271_DEFAULT_STA_RX_CONFIG; | ||
271 | wl->rx_filter = WL1271_DEFAULT_STA_RX_FILTER; | ||
272 | } | ||
273 | } | ||