1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * This file is part of wl1271 4 * 5 * Copyright (C) 2009 Nokia Corporation 6 * 7 * Contact: Luciano Coelho <luciano.coelho@nokia.com> 8 */ 9 10 #include <linux/gfp.h> 11 #include <linux/sched.h> 12 13 #include "wlcore.h" 14 #include "debug.h" 15 #include "acx.h" 16 #include "rx.h" 17 #include "tx.h" 18 #include "io.h" 19 #include "hw_ops.h" 20 21 /* 22 * TODO: this is here just for now, it must be removed when the data 23 * operations are in place. 24 */ 25 #include "../wl12xx/reg.h" 26 27 static u32 wlcore_rx_get_buf_size(struct wl1271 *wl, 28 u32 rx_pkt_desc) 29 { 30 if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN) 31 return (rx_pkt_desc & ALIGNED_RX_BUF_SIZE_MASK) >> 32 ALIGNED_RX_BUF_SIZE_SHIFT; 33 34 return (rx_pkt_desc & RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV; 35 } 36 37 static u32 wlcore_rx_get_align_buf_size(struct wl1271 *wl, u32 pkt_len) 38 { 39 if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN) 40 return ALIGN(pkt_len, WL12XX_BUS_BLOCK_SIZE); 41 42 return pkt_len; 43 } 44 45 static void wl1271_rx_status(struct wl1271 *wl, 46 struct wl1271_rx_descriptor *desc, 47 struct ieee80211_rx_status *status, 48 u8 beacon, u8 probe_rsp) 49 { 50 memset(status, 0, sizeof(struct ieee80211_rx_status)); 51 52 if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG) 53 status->band = NL80211_BAND_2GHZ; 54 else 55 status->band = NL80211_BAND_5GHZ; 56 57 status->rate_idx = wlcore_rate_to_idx(wl, desc->rate, status->band); 58 59 /* 11n support */ 60 if (desc->rate <= wl->hw_min_ht_rate) 61 status->encoding = RX_ENC_HT; 62 63 /* 64 * Read the signal level and antenna diversity indication. 65 * The msb in the signal level is always set as it is a 66 * negative number. 67 * The antenna indication is the msb of the rssi. 68 */ 69 status->signal = ((desc->rssi & RSSI_LEVEL_BITMASK) | BIT(7)); 70 status->antenna = ((desc->rssi & ANT_DIVERSITY_BITMASK) >> 7); 71 72 /* 73 * FIXME: In wl1251, the SNR should be divided by two. In wl1271 we 74 * need to divide by two for now, but TI has been discussing about 75 * changing it. This needs to be rechecked. 76 */ 77 wl->noise = desc->rssi - (desc->snr >> 1); 78 79 status->freq = ieee80211_channel_to_frequency(desc->channel, 80 status->band); 81 82 if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) { 83 u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK; 84 85 status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED | 86 RX_FLAG_DECRYPTED; 87 88 if (unlikely(desc_err_code & WL1271_RX_DESC_MIC_FAIL)) { 89 status->flag |= RX_FLAG_MMIC_ERROR; 90 wl1271_warning("Michael MIC error. Desc: 0x%x", 91 desc_err_code); 92 } 93 } 94 95 if (beacon || probe_rsp) 96 status->boottime_ns = ktime_get_boot_ns(); 97 98 if (beacon) 99 wlcore_set_pending_regdomain_ch(wl, (u16)desc->channel, 100 status->band); 101 } 102 103 static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length, 104 enum wl_rx_buf_align rx_align, u8 *hlid) 105 { 106 struct wl1271_rx_descriptor *desc; 107 struct sk_buff *skb; 108 struct ieee80211_hdr *hdr; 109 u8 beacon = 0; 110 u8 is_data = 0; 111 u8 reserved = 0, offset_to_data = 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 else if (rx_align == WLCORE_RX_BUF_PADDED) 132 offset_to_data = RX_BUF_ALIGN; 133 134 /* the data read starts with the descriptor */ 135 desc = (struct wl1271_rx_descriptor *) data; 136 137 if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) { 138 size_t len = length - sizeof(*desc); 139 wl12xx_copy_fwlog(wl, data + sizeof(*desc), len); 140 return 0; 141 } 142 143 /* discard corrupted packets */ 144 if (desc->status & WL1271_RX_DESC_DECRYPT_FAIL) { 145 hdr = (void *)(data + sizeof(*desc) + offset_to_data); 146 wl1271_warning("corrupted packet in RX: status: 0x%x len: %d", 147 desc->status & WL1271_RX_DESC_STATUS_MASK, 148 pkt_data_len); 149 wl1271_dump((DEBUG_RX|DEBUG_CMD), "PKT: ", data + sizeof(*desc), 150 min(pkt_data_len, 151 ieee80211_hdrlen(hdr->frame_control))); 152 return -EINVAL; 153 } 154 155 /* skb length not including rx descriptor */ 156 skb = __dev_alloc_skb(pkt_data_len + reserved, GFP_KERNEL); 157 if (!skb) { 158 wl1271_error("Couldn't allocate RX frame"); 159 return -ENOMEM; 160 } 161 162 /* reserve the unaligned payload(if any) */ 163 skb_reserve(skb, reserved); 164 165 /* 166 * Copy packets from aggregation buffer to the skbs without rx 167 * descriptor and with packet payload aligned care. In case of unaligned 168 * packets copy the packets in offset of 2 bytes guarantee IP header 169 * payload aligned to 4 bytes. 170 */ 171 skb_put_data(skb, data + sizeof(*desc), pkt_data_len); 172 if (rx_align == WLCORE_RX_BUF_PADDED) 173 skb_pull(skb, RX_BUF_ALIGN); 174 175 *hlid = desc->hlid; 176 177 hdr = (struct ieee80211_hdr *)skb->data; 178 if (ieee80211_is_beacon(hdr->frame_control)) 179 beacon = 1; 180 if (ieee80211_is_data_present(hdr->frame_control)) 181 is_data = 1; 182 183 wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon, 184 ieee80211_is_probe_resp(hdr->frame_control)); 185 wlcore_hw_set_rx_csum(wl, desc, skb); 186 187 seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4; 188 wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb, 189 skb->len - desc->pad_len, 190 beacon ? "beacon" : "", 191 seq_num, *hlid); 192 193 skb_queue_tail(&wl->deferred_rx_queue, skb); 194 queue_work(wl->freezable_wq, &wl->netstack_work); 195 196 return is_data; 197 } 198 199 int wlcore_rx(struct wl1271 *wl, struct wl_fw_status *status) 200 { 201 unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0}; 202 u32 buf_size; 203 u32 fw_rx_counter = status->fw_rx_counter % wl->num_rx_desc; 204 u32 drv_rx_counter = wl->rx_counter % wl->num_rx_desc; 205 u32 rx_counter; 206 u32 pkt_len, align_pkt_len; 207 u32 pkt_offset, des; 208 u8 hlid; 209 enum wl_rx_buf_align rx_align; 210 int ret = 0; 211 212 /* update rates per link */ 213 hlid = status->counters.hlid; 214 215 if (hlid < WLCORE_MAX_LINKS) 216 wl->links[hlid].fw_rate_mbps = 217 status->counters.tx_last_rate_mbps; 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); 293 294 out: 295 return ret; 296 } 297 298 #ifdef CONFIG_PM 299 int 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 } 326 327 int 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 } 338 339 out: 340 return ret; 341 } 342 #endif /* CONFIG_PM */ 343