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 "wlcore.h" 28 #include "debug.h" 29 #include "acx.h" 30 #include "rx.h" 31 #include "tx.h" 32 #include "io.h" 33 #include "hw_ops.h" 34 35 /* 36 * TODO: this is here just for now, it must be removed when the data 37 * operations are in place. 38 */ 39 #include "../wl12xx/reg.h" 40 41 static u32 wlcore_rx_get_buf_size(struct wl1271 *wl, 42 u32 rx_pkt_desc) 43 { 44 if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN) 45 return (rx_pkt_desc & ALIGNED_RX_BUF_SIZE_MASK) >> 46 ALIGNED_RX_BUF_SIZE_SHIFT; 47 48 return (rx_pkt_desc & RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV; 49 } 50 51 static u32 wlcore_rx_get_align_buf_size(struct wl1271 *wl, u32 pkt_len) 52 { 53 if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN) 54 return ALIGN(pkt_len, WL12XX_BUS_BLOCK_SIZE); 55 56 return pkt_len; 57 } 58 59 static void wl1271_rx_status(struct wl1271 *wl, 60 struct wl1271_rx_descriptor *desc, 61 struct ieee80211_rx_status *status, 62 u8 beacon) 63 { 64 memset(status, 0, sizeof(struct ieee80211_rx_status)); 65 66 if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG) 67 status->band = IEEE80211_BAND_2GHZ; 68 else 69 status->band = IEEE80211_BAND_5GHZ; 70 71 status->rate_idx = wlcore_rate_to_idx(wl, desc->rate, status->band); 72 73 /* 11n support */ 74 if (desc->rate <= wl->hw_min_ht_rate) 75 status->flag |= RX_FLAG_HT; 76 77 /* 78 * Read the signal level and antenna diversity indication. 79 * The msb in the signal level is always set as it is a 80 * negative number. 81 * The antenna indication is the msb of the rssi. 82 */ 83 status->signal = ((desc->rssi & RSSI_LEVEL_BITMASK) | BIT(7)); 84 status->antenna = ((desc->rssi & ANT_DIVERSITY_BITMASK) >> 7); 85 86 /* 87 * FIXME: In wl1251, the SNR should be divided by two. In wl1271 we 88 * need to divide by two for now, but TI has been discussing about 89 * changing it. This needs to be rechecked. 90 */ 91 wl->noise = desc->rssi - (desc->snr >> 1); 92 93 status->freq = ieee80211_channel_to_frequency(desc->channel, 94 status->band); 95 96 if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) { 97 u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK; 98 99 status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED | 100 RX_FLAG_DECRYPTED; 101 102 if (unlikely(desc_err_code & WL1271_RX_DESC_MIC_FAIL)) { 103 status->flag |= RX_FLAG_MMIC_ERROR; 104 wl1271_warning("Michael MIC error. Desc: 0x%x", 105 desc_err_code); 106 } 107 } 108 109 if (beacon) 110 wlcore_set_pending_regdomain_ch(wl, (u16)desc->channel, 111 status->band); 112 } 113 114 static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length, 115 enum wl_rx_buf_align rx_align, u8 *hlid) 116 { 117 struct wl1271_rx_descriptor *desc; 118 struct sk_buff *skb; 119 struct ieee80211_hdr *hdr; 120 u8 *buf; 121 u8 beacon = 0; 122 u8 is_data = 0; 123 u8 reserved = 0, offset_to_data = 0; 124 u16 seq_num; 125 u32 pkt_data_len; 126 127 /* 128 * In PLT mode we seem to get frames and mac80211 warns about them, 129 * workaround this by not retrieving them at all. 130 */ 131 if (unlikely(wl->plt)) 132 return -EINVAL; 133 134 pkt_data_len = wlcore_hw_get_rx_packet_len(wl, data, length); 135 if (!pkt_data_len) { 136 wl1271_error("Invalid packet arrived from HW. length %d", 137 length); 138 return -EINVAL; 139 } 140 141 if (rx_align == WLCORE_RX_BUF_UNALIGNED) 142 reserved = RX_BUF_ALIGN; 143 else if (rx_align == WLCORE_RX_BUF_PADDED) 144 offset_to_data = RX_BUF_ALIGN; 145 146 /* the data read starts with the descriptor */ 147 desc = (struct wl1271_rx_descriptor *) data; 148 149 if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) { 150 size_t len = length - sizeof(*desc); 151 wl12xx_copy_fwlog(wl, data + sizeof(*desc), len); 152 wake_up_interruptible(&wl->fwlog_waitq); 153 return 0; 154 } 155 156 /* discard corrupted packets */ 157 if (desc->status & WL1271_RX_DESC_DECRYPT_FAIL) { 158 hdr = (void *)(data + sizeof(*desc) + offset_to_data); 159 wl1271_warning("corrupted packet in RX: status: 0x%x len: %d", 160 desc->status & WL1271_RX_DESC_STATUS_MASK, 161 pkt_data_len); 162 wl1271_dump((DEBUG_RX|DEBUG_CMD), "PKT: ", data + sizeof(*desc), 163 min(pkt_data_len, 164 ieee80211_hdrlen(hdr->frame_control))); 165 return -EINVAL; 166 } 167 168 /* skb length not including rx descriptor */ 169 skb = __dev_alloc_skb(pkt_data_len + reserved, GFP_KERNEL); 170 if (!skb) { 171 wl1271_error("Couldn't allocate RX frame"); 172 return -ENOMEM; 173 } 174 175 /* reserve the unaligned payload(if any) */ 176 skb_reserve(skb, reserved); 177 178 buf = skb_put(skb, pkt_data_len); 179 180 /* 181 * Copy packets from aggregation buffer to the skbs without rx 182 * descriptor and with packet payload aligned care. In case of unaligned 183 * packets copy the packets in offset of 2 bytes guarantee IP header 184 * payload aligned to 4 bytes. 185 */ 186 memcpy(buf, data + sizeof(*desc), pkt_data_len); 187 if (rx_align == WLCORE_RX_BUF_PADDED) 188 skb_pull(skb, RX_BUF_ALIGN); 189 190 *hlid = desc->hlid; 191 192 hdr = (struct ieee80211_hdr *)skb->data; 193 if (ieee80211_is_beacon(hdr->frame_control)) 194 beacon = 1; 195 if (ieee80211_is_data_present(hdr->frame_control)) 196 is_data = 1; 197 198 wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon); 199 wlcore_hw_set_rx_csum(wl, desc, skb); 200 201 seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4; 202 wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb, 203 skb->len - desc->pad_len, 204 beacon ? "beacon" : "", 205 seq_num, *hlid); 206 207 skb_queue_tail(&wl->deferred_rx_queue, skb); 208 queue_work(wl->freezable_wq, &wl->netstack_work); 209 210 return is_data; 211 } 212 213 int wlcore_rx(struct wl1271 *wl, struct wl_fw_status *status) 214 { 215 unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0}; 216 u32 buf_size; 217 u32 fw_rx_counter = status->fw_rx_counter % wl->num_rx_desc; 218 u32 drv_rx_counter = wl->rx_counter % wl->num_rx_desc; 219 u32 rx_counter; 220 u32 pkt_len, align_pkt_len; 221 u32 pkt_offset, des; 222 u8 hlid; 223 enum wl_rx_buf_align rx_align; 224 int ret = 0; 225 226 while (drv_rx_counter != fw_rx_counter) { 227 buf_size = 0; 228 rx_counter = drv_rx_counter; 229 while (rx_counter != fw_rx_counter) { 230 des = le32_to_cpu(status->rx_pkt_descs[rx_counter]); 231 pkt_len = wlcore_rx_get_buf_size(wl, des); 232 align_pkt_len = wlcore_rx_get_align_buf_size(wl, 233 pkt_len); 234 if (buf_size + align_pkt_len > wl->aggr_buf_size) 235 break; 236 buf_size += align_pkt_len; 237 rx_counter++; 238 rx_counter %= wl->num_rx_desc; 239 } 240 241 if (buf_size == 0) { 242 wl1271_warning("received empty data"); 243 break; 244 } 245 246 /* Read all available packets at once */ 247 des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]); 248 ret = wlcore_hw_prepare_read(wl, des, buf_size); 249 if (ret < 0) 250 goto out; 251 252 ret = wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf, 253 buf_size, true); 254 if (ret < 0) 255 goto out; 256 257 /* Split data into separate packets */ 258 pkt_offset = 0; 259 while (pkt_offset < buf_size) { 260 des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]); 261 pkt_len = wlcore_rx_get_buf_size(wl, des); 262 rx_align = wlcore_hw_get_rx_buf_align(wl, des); 263 264 /* 265 * the handle data call can only fail in memory-outage 266 * conditions, in that case the received frame will just 267 * be dropped. 268 */ 269 if (wl1271_rx_handle_data(wl, 270 wl->aggr_buf + pkt_offset, 271 pkt_len, rx_align, 272 &hlid) == 1) { 273 if (hlid < wl->num_links) 274 __set_bit(hlid, active_hlids); 275 else 276 WARN(1, 277 "hlid (%d) exceeded MAX_LINKS\n", 278 hlid); 279 } 280 281 wl->rx_counter++; 282 drv_rx_counter++; 283 drv_rx_counter %= wl->num_rx_desc; 284 pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len); 285 } 286 } 287 288 /* 289 * Write the driver's packet counter to the FW. This is only required 290 * for older hardware revisions 291 */ 292 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) { 293 ret = wlcore_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER, 294 wl->rx_counter); 295 if (ret < 0) 296 goto out; 297 } 298 299 wl12xx_rearm_rx_streaming(wl, active_hlids); 300 301 out: 302 return ret; 303 } 304 305 #ifdef CONFIG_PM 306 int wl1271_rx_filter_enable(struct wl1271 *wl, 307 int index, bool enable, 308 struct wl12xx_rx_filter *filter) 309 { 310 int ret; 311 312 if (!!test_bit(index, wl->rx_filter_enabled) == enable) { 313 wl1271_warning("Request to enable an already " 314 "enabled rx filter %d", index); 315 return 0; 316 } 317 318 ret = wl1271_acx_set_rx_filter(wl, index, enable, filter); 319 320 if (ret) { 321 wl1271_error("Failed to %s rx data filter %d (err=%d)", 322 enable ? "enable" : "disable", index, ret); 323 return ret; 324 } 325 326 if (enable) 327 __set_bit(index, wl->rx_filter_enabled); 328 else 329 __clear_bit(index, wl->rx_filter_enabled); 330 331 return 0; 332 } 333 334 int wl1271_rx_filter_clear_all(struct wl1271 *wl) 335 { 336 int i, ret = 0; 337 338 for (i = 0; i < WL1271_MAX_RX_FILTERS; i++) { 339 if (!test_bit(i, wl->rx_filter_enabled)) 340 continue; 341 ret = wl1271_rx_filter_enable(wl, i, 0, NULL); 342 if (ret) 343 goto out; 344 } 345 346 out: 347 return ret; 348 } 349 #endif /* CONFIG_PM */ 350