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 = NL80211_BAND_2GHZ; 68 else 69 status->band = NL80211_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->encoding = RX_ENC_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 beacon = 0; 121 u8 is_data = 0; 122 u8 reserved = 0, offset_to_data = 0; 123 u16 seq_num; 124 u32 pkt_data_len; 125 126 /* 127 * In PLT mode we seem to get frames and mac80211 warns about them, 128 * workaround this by not retrieving them at all. 129 */ 130 if (unlikely(wl->plt)) 131 return -EINVAL; 132 133 pkt_data_len = wlcore_hw_get_rx_packet_len(wl, data, length); 134 if (!pkt_data_len) { 135 wl1271_error("Invalid packet arrived from HW. length %d", 136 length); 137 return -EINVAL; 138 } 139 140 if (rx_align == WLCORE_RX_BUF_UNALIGNED) 141 reserved = RX_BUF_ALIGN; 142 else if (rx_align == WLCORE_RX_BUF_PADDED) 143 offset_to_data = RX_BUF_ALIGN; 144 145 /* the data read starts with the descriptor */ 146 desc = (struct wl1271_rx_descriptor *) data; 147 148 if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) { 149 size_t len = length - sizeof(*desc); 150 wl12xx_copy_fwlog(wl, data + sizeof(*desc), len); 151 return 0; 152 } 153 154 /* discard corrupted packets */ 155 if (desc->status & WL1271_RX_DESC_DECRYPT_FAIL) { 156 hdr = (void *)(data + sizeof(*desc) + offset_to_data); 157 wl1271_warning("corrupted packet in RX: status: 0x%x len: %d", 158 desc->status & WL1271_RX_DESC_STATUS_MASK, 159 pkt_data_len); 160 wl1271_dump((DEBUG_RX|DEBUG_CMD), "PKT: ", data + sizeof(*desc), 161 min(pkt_data_len, 162 ieee80211_hdrlen(hdr->frame_control))); 163 return -EINVAL; 164 } 165 166 /* skb length not including rx descriptor */ 167 skb = __dev_alloc_skb(pkt_data_len + reserved, GFP_KERNEL); 168 if (!skb) { 169 wl1271_error("Couldn't allocate RX frame"); 170 return -ENOMEM; 171 } 172 173 /* reserve the unaligned payload(if any) */ 174 skb_reserve(skb, reserved); 175 176 /* 177 * Copy packets from aggregation buffer to the skbs without rx 178 * descriptor and with packet payload aligned care. In case of unaligned 179 * packets copy the packets in offset of 2 bytes guarantee IP header 180 * payload aligned to 4 bytes. 181 */ 182 skb_put_data(skb, data + sizeof(*desc), pkt_data_len); 183 if (rx_align == WLCORE_RX_BUF_PADDED) 184 skb_pull(skb, RX_BUF_ALIGN); 185 186 *hlid = desc->hlid; 187 188 hdr = (struct ieee80211_hdr *)skb->data; 189 if (ieee80211_is_beacon(hdr->frame_control)) 190 beacon = 1; 191 if (ieee80211_is_data_present(hdr->frame_control)) 192 is_data = 1; 193 194 wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon); 195 wlcore_hw_set_rx_csum(wl, desc, skb); 196 197 seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4; 198 wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb, 199 skb->len - desc->pad_len, 200 beacon ? "beacon" : "", 201 seq_num, *hlid); 202 203 skb_queue_tail(&wl->deferred_rx_queue, skb); 204 queue_work(wl->freezable_wq, &wl->netstack_work); 205 206 return is_data; 207 } 208 209 int wlcore_rx(struct wl1271 *wl, struct wl_fw_status *status) 210 { 211 unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0}; 212 u32 buf_size; 213 u32 fw_rx_counter = status->fw_rx_counter % wl->num_rx_desc; 214 u32 drv_rx_counter = wl->rx_counter % wl->num_rx_desc; 215 u32 rx_counter; 216 u32 pkt_len, align_pkt_len; 217 u32 pkt_offset, des; 218 u8 hlid; 219 enum wl_rx_buf_align rx_align; 220 int ret = 0; 221 222 /* update rates per link */ 223 hlid = status->counters.hlid; 224 225 if (hlid < WLCORE_MAX_LINKS) 226 wl->links[hlid].fw_rate_mbps = 227 status->counters.tx_last_rate_mbps; 228 229 while (drv_rx_counter != fw_rx_counter) { 230 buf_size = 0; 231 rx_counter = drv_rx_counter; 232 while (rx_counter != fw_rx_counter) { 233 des = le32_to_cpu(status->rx_pkt_descs[rx_counter]); 234 pkt_len = wlcore_rx_get_buf_size(wl, des); 235 align_pkt_len = wlcore_rx_get_align_buf_size(wl, 236 pkt_len); 237 if (buf_size + align_pkt_len > wl->aggr_buf_size) 238 break; 239 buf_size += align_pkt_len; 240 rx_counter++; 241 rx_counter %= wl->num_rx_desc; 242 } 243 244 if (buf_size == 0) { 245 wl1271_warning("received empty data"); 246 break; 247 } 248 249 /* Read all available packets at once */ 250 des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]); 251 ret = wlcore_hw_prepare_read(wl, des, buf_size); 252 if (ret < 0) 253 goto out; 254 255 ret = wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf, 256 buf_size, true); 257 if (ret < 0) 258 goto out; 259 260 /* Split data into separate packets */ 261 pkt_offset = 0; 262 while (pkt_offset < buf_size) { 263 des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]); 264 pkt_len = wlcore_rx_get_buf_size(wl, des); 265 rx_align = wlcore_hw_get_rx_buf_align(wl, des); 266 267 /* 268 * the handle data call can only fail in memory-outage 269 * conditions, in that case the received frame will just 270 * be dropped. 271 */ 272 if (wl1271_rx_handle_data(wl, 273 wl->aggr_buf + pkt_offset, 274 pkt_len, rx_align, 275 &hlid) == 1) { 276 if (hlid < wl->num_links) 277 __set_bit(hlid, active_hlids); 278 else 279 WARN(1, 280 "hlid (%d) exceeded MAX_LINKS\n", 281 hlid); 282 } 283 284 wl->rx_counter++; 285 drv_rx_counter++; 286 drv_rx_counter %= wl->num_rx_desc; 287 pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len); 288 } 289 } 290 291 /* 292 * Write the driver's packet counter to the FW. This is only required 293 * for older hardware revisions 294 */ 295 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) { 296 ret = wlcore_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER, 297 wl->rx_counter); 298 if (ret < 0) 299 goto out; 300 } 301 302 wl12xx_rearm_rx_streaming(wl, active_hlids); 303 304 out: 305 return ret; 306 } 307 308 #ifdef CONFIG_PM 309 int wl1271_rx_filter_enable(struct wl1271 *wl, 310 int index, bool enable, 311 struct wl12xx_rx_filter *filter) 312 { 313 int ret; 314 315 if (!!test_bit(index, wl->rx_filter_enabled) == enable) { 316 wl1271_warning("Request to enable an already " 317 "enabled rx filter %d", index); 318 return 0; 319 } 320 321 ret = wl1271_acx_set_rx_filter(wl, index, enable, filter); 322 323 if (ret) { 324 wl1271_error("Failed to %s rx data filter %d (err=%d)", 325 enable ? "enable" : "disable", index, ret); 326 return ret; 327 } 328 329 if (enable) 330 __set_bit(index, wl->rx_filter_enabled); 331 else 332 __clear_bit(index, wl->rx_filter_enabled); 333 334 return 0; 335 } 336 337 int wl1271_rx_filter_clear_all(struct wl1271 *wl) 338 { 339 int i, ret = 0; 340 341 for (i = 0; i < WL1271_MAX_RX_FILTERS; i++) { 342 if (!test_bit(i, wl->rx_filter_enabled)) 343 continue; 344 ret = wl1271_rx_filter_enable(wl, i, 0, NULL); 345 if (ret) 346 goto out; 347 } 348 349 out: 350 return ret; 351 } 352 #endif /* CONFIG_PM */ 353