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 status->signal = desc->rssi; 78 79 /* 80 * FIXME: In wl1251, the SNR should be divided by two. In wl1271 we 81 * need to divide by two for now, but TI has been discussing about 82 * changing it. This needs to be rechecked. 83 */ 84 wl->noise = desc->rssi - (desc->snr >> 1); 85 86 status->freq = ieee80211_channel_to_frequency(desc->channel, 87 status->band); 88 89 if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) { 90 u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK; 91 92 status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED | 93 RX_FLAG_DECRYPTED; 94 95 if (unlikely(desc_err_code == WL1271_RX_DESC_MIC_FAIL)) { 96 status->flag |= RX_FLAG_MMIC_ERROR; 97 wl1271_warning("Michael MIC error"); 98 } 99 } 100 } 101 102 static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length, 103 enum wl_rx_buf_align rx_align, u8 *hlid) 104 { 105 struct wl1271_rx_descriptor *desc; 106 struct sk_buff *skb; 107 struct ieee80211_hdr *hdr; 108 u8 *buf; 109 u8 beacon = 0; 110 u8 is_data = 0; 111 u8 reserved = 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; 131 132 /* the data read starts with the descriptor */ 133 desc = (struct wl1271_rx_descriptor *) data; 134 135 if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) { 136 size_t len = length - sizeof(*desc); 137 wl12xx_copy_fwlog(wl, data + sizeof(*desc), len); 138 wake_up_interruptible(&wl->fwlog_waitq); 139 return 0; 140 } 141 142 switch (desc->status & WL1271_RX_DESC_STATUS_MASK) { 143 /* discard corrupted packets */ 144 case WL1271_RX_DESC_DRIVER_RX_Q_FAIL: 145 case WL1271_RX_DESC_DECRYPT_FAIL: 146 wl1271_warning("corrupted packet in RX with status: 0x%x", 147 desc->status & WL1271_RX_DESC_STATUS_MASK); 148 return -EINVAL; 149 case WL1271_RX_DESC_SUCCESS: 150 case WL1271_RX_DESC_MIC_FAIL: 151 break; 152 default: 153 wl1271_error("invalid RX descriptor status: 0x%x", 154 desc->status & WL1271_RX_DESC_STATUS_MASK); 155 return -EINVAL; 156 } 157 158 /* skb length not including rx descriptor */ 159 skb = __dev_alloc_skb(pkt_data_len + reserved, GFP_KERNEL); 160 if (!skb) { 161 wl1271_error("Couldn't allocate RX frame"); 162 return -ENOMEM; 163 } 164 165 /* reserve the unaligned payload(if any) */ 166 skb_reserve(skb, reserved); 167 168 buf = skb_put(skb, pkt_data_len); 169 170 /* 171 * Copy packets from aggregation buffer to the skbs without rx 172 * descriptor and with packet payload aligned care. In case of unaligned 173 * packets copy the packets in offset of 2 bytes guarantee IP header 174 * payload aligned to 4 bytes. 175 */ 176 memcpy(buf, data + sizeof(*desc), pkt_data_len); 177 if (rx_align == WLCORE_RX_BUF_PADDED) 178 skb_pull(skb, RX_BUF_ALIGN); 179 180 *hlid = desc->hlid; 181 182 hdr = (struct ieee80211_hdr *)skb->data; 183 if (ieee80211_is_beacon(hdr->frame_control)) 184 beacon = 1; 185 if (ieee80211_is_data_present(hdr->frame_control)) 186 is_data = 1; 187 188 wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon); 189 wlcore_hw_set_rx_csum(wl, desc, skb); 190 191 seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4; 192 wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb, 193 skb->len - desc->pad_len, 194 beacon ? "beacon" : "", 195 seq_num, *hlid); 196 197 skb_queue_tail(&wl->deferred_rx_queue, skb); 198 queue_work(wl->freezable_wq, &wl->netstack_work); 199 200 return is_data; 201 } 202 203 int wlcore_rx(struct wl1271 *wl, struct wl_fw_status_1 *status) 204 { 205 unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0}; 206 u32 buf_size; 207 u32 fw_rx_counter = status->fw_rx_counter % wl->num_rx_desc; 208 u32 drv_rx_counter = wl->rx_counter % wl->num_rx_desc; 209 u32 rx_counter; 210 u32 pkt_len, align_pkt_len; 211 u32 pkt_offset, des; 212 u8 hlid; 213 enum wl_rx_buf_align rx_align; 214 int ret = 0; 215 216 while (drv_rx_counter != fw_rx_counter) { 217 buf_size = 0; 218 rx_counter = drv_rx_counter; 219 while (rx_counter != fw_rx_counter) { 220 des = le32_to_cpu(status->rx_pkt_descs[rx_counter]); 221 pkt_len = wlcore_rx_get_buf_size(wl, des); 222 align_pkt_len = wlcore_rx_get_align_buf_size(wl, 223 pkt_len); 224 if (buf_size + align_pkt_len > wl->aggr_buf_size) 225 break; 226 buf_size += align_pkt_len; 227 rx_counter++; 228 rx_counter %= wl->num_rx_desc; 229 } 230 231 if (buf_size == 0) { 232 wl1271_warning("received empty data"); 233 break; 234 } 235 236 /* Read all available packets at once */ 237 des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]); 238 ret = wlcore_hw_prepare_read(wl, des, buf_size); 239 if (ret < 0) 240 goto out; 241 242 ret = wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf, 243 buf_size, true); 244 if (ret < 0) 245 goto out; 246 247 /* Split data into separate packets */ 248 pkt_offset = 0; 249 while (pkt_offset < buf_size) { 250 des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]); 251 pkt_len = wlcore_rx_get_buf_size(wl, des); 252 rx_align = wlcore_hw_get_rx_buf_align(wl, des); 253 254 /* 255 * the handle data call can only fail in memory-outage 256 * conditions, in that case the received frame will just 257 * be dropped. 258 */ 259 if (wl1271_rx_handle_data(wl, 260 wl->aggr_buf + pkt_offset, 261 pkt_len, rx_align, 262 &hlid) == 1) { 263 if (hlid < WL12XX_MAX_LINKS) 264 __set_bit(hlid, active_hlids); 265 else 266 WARN(1, 267 "hlid exceeded WL12XX_MAX_LINKS " 268 "(%d)\n", hlid); 269 } 270 271 wl->rx_counter++; 272 drv_rx_counter++; 273 drv_rx_counter %= wl->num_rx_desc; 274 pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len); 275 } 276 } 277 278 /* 279 * Write the driver's packet counter to the FW. This is only required 280 * for older hardware revisions 281 */ 282 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) { 283 ret = wlcore_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER, 284 wl->rx_counter); 285 if (ret < 0) 286 goto out; 287 } 288 289 wl12xx_rearm_rx_streaming(wl, active_hlids); 290 291 out: 292 return ret; 293 } 294 295 #ifdef CONFIG_PM 296 int wl1271_rx_filter_enable(struct wl1271 *wl, 297 int index, bool enable, 298 struct wl12xx_rx_filter *filter) 299 { 300 int ret; 301 302 if (wl->rx_filter_enabled[index] == enable) { 303 wl1271_warning("Request to enable an already " 304 "enabled rx filter %d", index); 305 return 0; 306 } 307 308 ret = wl1271_acx_set_rx_filter(wl, index, enable, filter); 309 310 if (ret) { 311 wl1271_error("Failed to %s rx data filter %d (err=%d)", 312 enable ? "enable" : "disable", index, ret); 313 return ret; 314 } 315 316 wl->rx_filter_enabled[index] = enable; 317 318 return 0; 319 } 320 321 int wl1271_rx_filter_clear_all(struct wl1271 *wl) 322 { 323 int i, ret = 0; 324 325 for (i = 0; i < WL1271_MAX_RX_FILTERS; i++) { 326 if (!wl->rx_filter_enabled[i]) 327 continue; 328 ret = wl1271_rx_filter_enable(wl, i, 0, NULL); 329 if (ret) 330 goto out; 331 } 332 333 out: 334 return ret; 335 } 336 #endif /* CONFIG_PM */ 337