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 41static 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 51static 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 59static 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. Desc: 0x%x", 98 desc_err_code); 99 } 100 } 101 102 if (beacon) 103 wlcore_set_pending_regdomain_ch(wl, (u16)desc->channel, 104 status->band); 105} 106 107static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length, 108 enum wl_rx_buf_align rx_align, u8 *hlid) 109{ 110 struct wl1271_rx_descriptor *desc; 111 struct sk_buff *skb; 112 struct ieee80211_hdr *hdr; 113 u8 *buf; 114 u8 beacon = 0; 115 u8 is_data = 0; 116 u8 reserved = 0, offset_to_data = 0; 117 u16 seq_num; 118 u32 pkt_data_len; 119 120 /* 121 * In PLT mode we seem to get frames and mac80211 warns about them, 122 * workaround this by not retrieving them at all. 123 */ 124 if (unlikely(wl->plt)) 125 return -EINVAL; 126 127 pkt_data_len = wlcore_hw_get_rx_packet_len(wl, data, length); 128 if (!pkt_data_len) { 129 wl1271_error("Invalid packet arrived from HW. length %d", 130 length); 131 return -EINVAL; 132 } 133 134 if (rx_align == WLCORE_RX_BUF_UNALIGNED) 135 reserved = RX_BUF_ALIGN; 136 else if (rx_align == WLCORE_RX_BUF_PADDED) 137 offset_to_data = RX_BUF_ALIGN; 138 139 /* the data read starts with the descriptor */ 140 desc = (struct wl1271_rx_descriptor *) data; 141 142 if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) { 143 size_t len = length - sizeof(*desc); 144 wl12xx_copy_fwlog(wl, data + sizeof(*desc), len); 145 wake_up_interruptible(&wl->fwlog_waitq); 146 return 0; 147 } 148 149 /* discard corrupted packets */ 150 if (desc->status & WL1271_RX_DESC_DECRYPT_FAIL) { 151 hdr = (void *)(data + sizeof(*desc) + offset_to_data); 152 wl1271_warning("corrupted packet in RX: status: 0x%x len: %d", 153 desc->status & WL1271_RX_DESC_STATUS_MASK, 154 pkt_data_len); 155 wl1271_dump((DEBUG_RX|DEBUG_CMD), "PKT: ", data + sizeof(*desc), 156 min(pkt_data_len, 157 ieee80211_hdrlen(hdr->frame_control))); 158 return -EINVAL; 159 } 160 161 /* skb length not including rx descriptor */ 162 skb = __dev_alloc_skb(pkt_data_len + reserved, GFP_KERNEL); 163 if (!skb) { 164 wl1271_error("Couldn't allocate RX frame"); 165 return -ENOMEM; 166 } 167 168 /* reserve the unaligned payload(if any) */ 169 skb_reserve(skb, reserved); 170 171 buf = skb_put(skb, pkt_data_len); 172 173 /* 174 * Copy packets from aggregation buffer to the skbs without rx 175 * descriptor and with packet payload aligned care. In case of unaligned 176 * packets copy the packets in offset of 2 bytes guarantee IP header 177 * payload aligned to 4 bytes. 178 */ 179 memcpy(buf, data + sizeof(*desc), pkt_data_len); 180 if (rx_align == WLCORE_RX_BUF_PADDED) 181 skb_pull(skb, RX_BUF_ALIGN); 182 183 *hlid = desc->hlid; 184 185 hdr = (struct ieee80211_hdr *)skb->data; 186 if (ieee80211_is_beacon(hdr->frame_control)) 187 beacon = 1; 188 if (ieee80211_is_data_present(hdr->frame_control)) 189 is_data = 1; 190 191 wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon); 192 wlcore_hw_set_rx_csum(wl, desc, skb); 193 194 seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4; 195 wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb, 196 skb->len - desc->pad_len, 197 beacon ? "beacon" : "", 198 seq_num, *hlid); 199 200 skb_queue_tail(&wl->deferred_rx_queue, skb); 201 queue_work(wl->freezable_wq, &wl->netstack_work); 202 203 return is_data; 204} 205 206int wlcore_rx(struct wl1271 *wl, struct wl_fw_status *status) 207{ 208 unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0}; 209 u32 buf_size; 210 u32 fw_rx_counter = status->fw_rx_counter % wl->num_rx_desc; 211 u32 drv_rx_counter = wl->rx_counter % wl->num_rx_desc; 212 u32 rx_counter; 213 u32 pkt_len, align_pkt_len; 214 u32 pkt_offset, des; 215 u8 hlid; 216 enum wl_rx_buf_align rx_align; 217 int ret = 0; 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 294out: 295 return ret; 296} 297 298#ifdef CONFIG_PM 299int 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 327int 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 339out: 340 return ret; 341} 342#endif /* CONFIG_PM */ 343