Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 |
| 6 | * as published by the Free Software Foundation |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | */ |
| 13 | |
| 14 | #include "mt7601u.h" |
| 15 | #include "dma.h" |
| 16 | #include "usb.h" |
| 17 | #include "trace.h" |
| 18 | |
| 19 | static int mt7601u_submit_rx_buf(struct mt7601u_dev *dev, |
| 20 | struct mt7601u_dma_buf_rx *e, gfp_t gfp); |
| 21 | |
| 22 | static unsigned int ieee80211_get_hdrlen_from_buf(const u8 *data, unsigned len) |
| 23 | { |
| 24 | const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)data; |
| 25 | unsigned int hdrlen; |
| 26 | |
| 27 | if (unlikely(len < 10)) |
| 28 | return 0; |
| 29 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| 30 | if (unlikely(hdrlen > len)) |
| 31 | return 0; |
| 32 | return hdrlen; |
| 33 | } |
| 34 | |
| 35 | static struct sk_buff * |
| 36 | mt7601u_rx_skb_from_seg(struct mt7601u_dev *dev, struct mt7601u_rxwi *rxwi, |
Jakub Kicinski | 69647fa | 2015-06-02 21:11:25 +0200 | [diff] [blame] | 37 | void *data, u32 seg_len, u32 truesize, struct page *p) |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 38 | { |
| 39 | struct sk_buff *skb; |
Jakub Kicinski | 2af6d21 | 2015-06-02 21:11:26 +0200 | [diff] [blame] | 40 | u32 true_len, hdr_len = 0, copy, frag; |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 41 | |
Jakub Kicinski | 69647fa | 2015-06-02 21:11:25 +0200 | [diff] [blame] | 42 | skb = alloc_skb(p ? 128 : seg_len, GFP_ATOMIC); |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 43 | if (!skb) |
| 44 | return NULL; |
| 45 | |
| 46 | true_len = mt76_mac_process_rx(dev, skb, data, rxwi); |
Jakub Kicinski | 2af6d21 | 2015-06-02 21:11:26 +0200 | [diff] [blame] | 47 | if (!true_len || true_len > seg_len) |
| 48 | goto bad_frame; |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 49 | |
Jakub Kicinski | 69647fa | 2015-06-02 21:11:25 +0200 | [diff] [blame] | 50 | hdr_len = ieee80211_get_hdrlen_from_buf(data, true_len); |
Jakub Kicinski | 2af6d21 | 2015-06-02 21:11:26 +0200 | [diff] [blame] | 51 | if (!hdr_len) |
| 52 | goto bad_frame; |
| 53 | |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 54 | if (rxwi->rxinfo & cpu_to_le32(MT_RXINFO_L2PAD)) { |
| 55 | memcpy(skb_put(skb, hdr_len), data, hdr_len); |
Jakub Kicinski | 69647fa | 2015-06-02 21:11:25 +0200 | [diff] [blame] | 56 | |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 57 | data += hdr_len + 2; |
| 58 | true_len -= hdr_len; |
| 59 | hdr_len = 0; |
| 60 | } |
| 61 | |
Jakub Kicinski | 69647fa | 2015-06-02 21:11:25 +0200 | [diff] [blame] | 62 | /* If not doing paged RX allocated skb will always have enough space */ |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 63 | copy = (true_len <= skb_tailroom(skb)) ? true_len : hdr_len + 8; |
| 64 | frag = true_len - copy; |
| 65 | |
| 66 | memcpy(skb_put(skb, copy), data, copy); |
| 67 | data += copy; |
| 68 | |
| 69 | if (frag) { |
| 70 | skb_add_rx_frag(skb, 0, p, data - page_address(p), |
| 71 | frag, truesize); |
| 72 | get_page(p); |
| 73 | } |
| 74 | |
| 75 | return skb; |
Jakub Kicinski | 2af6d21 | 2015-06-02 21:11:26 +0200 | [diff] [blame] | 76 | |
| 77 | bad_frame: |
| 78 | dev_err_ratelimited(dev->dev, "Error: incorrect frame len:%u hdr:%u\n", |
| 79 | true_len, hdr_len); |
| 80 | dev_kfree_skb(skb); |
| 81 | return NULL; |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 82 | } |
| 83 | |
| 84 | static void mt7601u_rx_process_seg(struct mt7601u_dev *dev, u8 *data, |
Jakub Kicinski | 69647fa | 2015-06-02 21:11:25 +0200 | [diff] [blame] | 85 | u32 seg_len, struct page *p) |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 86 | { |
| 87 | struct sk_buff *skb; |
| 88 | struct mt7601u_rxwi *rxwi; |
| 89 | u32 fce_info, truesize = seg_len; |
| 90 | |
| 91 | /* DMA_INFO field at the beginning of the segment contains only some of |
| 92 | * the information, we need to read the FCE descriptor from the end. |
| 93 | */ |
| 94 | fce_info = get_unaligned_le32(data + seg_len - MT_FCE_INFO_LEN); |
| 95 | seg_len -= MT_FCE_INFO_LEN; |
| 96 | |
| 97 | data += MT_DMA_HDR_LEN; |
| 98 | seg_len -= MT_DMA_HDR_LEN; |
| 99 | |
| 100 | rxwi = (struct mt7601u_rxwi *) data; |
| 101 | data += sizeof(struct mt7601u_rxwi); |
| 102 | seg_len -= sizeof(struct mt7601u_rxwi); |
| 103 | |
| 104 | if (unlikely(rxwi->zero[0] || rxwi->zero[1] || rxwi->zero[2])) |
| 105 | dev_err_once(dev->dev, "Error: RXWI zero fields are set\n"); |
Jakub Kicinski | d43af50 | 2016-08-31 12:46:47 +0100 | [diff] [blame] | 106 | if (unlikely(FIELD_GET(MT_RXD_INFO_TYPE, fce_info))) |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 107 | dev_err_once(dev->dev, "Error: RX path seen a non-pkt urb\n"); |
| 108 | |
| 109 | trace_mt_rx(dev, rxwi, fce_info); |
| 110 | |
Jakub Kicinski | 69647fa | 2015-06-02 21:11:25 +0200 | [diff] [blame] | 111 | skb = mt7601u_rx_skb_from_seg(dev, rxwi, data, seg_len, truesize, p); |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 112 | if (!skb) |
| 113 | return; |
| 114 | |
Jakub Kicinski | 78623bf | 2015-07-31 15:04:49 +0200 | [diff] [blame] | 115 | spin_lock(&dev->mac_lock); |
Jakub Kicinski | d9517c0 | 2015-07-31 15:04:47 +0200 | [diff] [blame] | 116 | ieee80211_rx(dev->hw, skb); |
Jakub Kicinski | 78623bf | 2015-07-31 15:04:49 +0200 | [diff] [blame] | 117 | spin_unlock(&dev->mac_lock); |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 118 | } |
| 119 | |
| 120 | static u16 mt7601u_rx_next_seg_len(u8 *data, u32 data_len) |
| 121 | { |
| 122 | u32 min_seg_len = MT_DMA_HDR_LEN + MT_RX_INFO_LEN + |
| 123 | sizeof(struct mt7601u_rxwi) + MT_FCE_INFO_LEN; |
| 124 | u16 dma_len = get_unaligned_le16(data); |
| 125 | |
| 126 | if (data_len < min_seg_len || |
| 127 | WARN_ON(!dma_len) || |
| 128 | WARN_ON(dma_len + MT_DMA_HDRS > data_len) || |
| 129 | WARN_ON(dma_len & 0x3)) |
| 130 | return 0; |
| 131 | |
| 132 | return MT_DMA_HDRS + dma_len; |
| 133 | } |
| 134 | |
| 135 | static void |
| 136 | mt7601u_rx_process_entry(struct mt7601u_dev *dev, struct mt7601u_dma_buf_rx *e) |
| 137 | { |
| 138 | u32 seg_len, data_len = e->urb->actual_length; |
| 139 | u8 *data = page_address(e->p); |
| 140 | struct page *new_p = NULL; |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 141 | int cnt = 0; |
| 142 | |
| 143 | if (!test_bit(MT7601U_STATE_INITIALIZED, &dev->state)) |
| 144 | return; |
| 145 | |
| 146 | /* Copy if there is very little data in the buffer. */ |
Jakub Kicinski | 69647fa | 2015-06-02 21:11:25 +0200 | [diff] [blame] | 147 | if (data_len > 512) |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 148 | new_p = dev_alloc_pages(MT_RX_ORDER); |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 149 | |
| 150 | while ((seg_len = mt7601u_rx_next_seg_len(data, data_len))) { |
Jakub Kicinski | 69647fa | 2015-06-02 21:11:25 +0200 | [diff] [blame] | 151 | mt7601u_rx_process_seg(dev, data, seg_len, new_p ? e->p : NULL); |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 152 | |
| 153 | data_len -= seg_len; |
| 154 | data += seg_len; |
| 155 | cnt++; |
| 156 | } |
| 157 | |
| 158 | if (cnt > 1) |
Jakub Kicinski | 69647fa | 2015-06-02 21:11:25 +0200 | [diff] [blame] | 159 | trace_mt_rx_dma_aggr(dev, cnt, !!new_p); |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 160 | |
Jakub Kicinski | 69647fa | 2015-06-02 21:11:25 +0200 | [diff] [blame] | 161 | if (new_p) { |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 162 | /* we have one extra ref from the allocator */ |
| 163 | __free_pages(e->p, MT_RX_ORDER); |
| 164 | |
| 165 | e->p = new_p; |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | static struct mt7601u_dma_buf_rx * |
| 170 | mt7601u_rx_get_pending_entry(struct mt7601u_dev *dev) |
| 171 | { |
| 172 | struct mt7601u_rx_queue *q = &dev->rx_q; |
| 173 | struct mt7601u_dma_buf_rx *buf = NULL; |
| 174 | unsigned long flags; |
| 175 | |
| 176 | spin_lock_irqsave(&dev->rx_lock, flags); |
| 177 | |
| 178 | if (!q->pending) |
| 179 | goto out; |
| 180 | |
| 181 | buf = &q->e[q->start]; |
| 182 | q->pending--; |
| 183 | q->start = (q->start + 1) % q->entries; |
| 184 | out: |
| 185 | spin_unlock_irqrestore(&dev->rx_lock, flags); |
| 186 | |
| 187 | return buf; |
| 188 | } |
| 189 | |
| 190 | static void mt7601u_complete_rx(struct urb *urb) |
| 191 | { |
| 192 | struct mt7601u_dev *dev = urb->context; |
| 193 | struct mt7601u_rx_queue *q = &dev->rx_q; |
| 194 | unsigned long flags; |
| 195 | |
| 196 | spin_lock_irqsave(&dev->rx_lock, flags); |
| 197 | |
| 198 | if (mt7601u_urb_has_error(urb)) |
| 199 | dev_err(dev->dev, "Error: RX urb failed:%d\n", urb->status); |
| 200 | if (WARN_ONCE(q->e[q->end].urb != urb, "RX urb mismatch")) |
| 201 | goto out; |
| 202 | |
| 203 | q->end = (q->end + 1) % q->entries; |
| 204 | q->pending++; |
| 205 | tasklet_schedule(&dev->rx_tasklet); |
| 206 | out: |
| 207 | spin_unlock_irqrestore(&dev->rx_lock, flags); |
| 208 | } |
| 209 | |
| 210 | static void mt7601u_rx_tasklet(unsigned long data) |
| 211 | { |
| 212 | struct mt7601u_dev *dev = (struct mt7601u_dev *) data; |
| 213 | struct mt7601u_dma_buf_rx *e; |
| 214 | |
| 215 | while ((e = mt7601u_rx_get_pending_entry(dev))) { |
| 216 | if (e->urb->status) |
| 217 | continue; |
| 218 | |
| 219 | mt7601u_rx_process_entry(dev, e); |
| 220 | mt7601u_submit_rx_buf(dev, e, GFP_ATOMIC); |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | static void mt7601u_complete_tx(struct urb *urb) |
| 225 | { |
| 226 | struct mt7601u_tx_queue *q = urb->context; |
| 227 | struct mt7601u_dev *dev = q->dev; |
| 228 | struct sk_buff *skb; |
| 229 | unsigned long flags; |
| 230 | |
| 231 | spin_lock_irqsave(&dev->tx_lock, flags); |
| 232 | |
| 233 | if (mt7601u_urb_has_error(urb)) |
| 234 | dev_err(dev->dev, "Error: TX urb failed:%d\n", urb->status); |
| 235 | if (WARN_ONCE(q->e[q->start].urb != urb, "TX urb mismatch")) |
| 236 | goto out; |
| 237 | |
| 238 | skb = q->e[q->start].skb; |
| 239 | trace_mt_tx_dma_done(dev, skb); |
| 240 | |
Jakub Kicinski | 4513493 | 2015-07-31 15:04:48 +0200 | [diff] [blame] | 241 | __skb_queue_tail(&dev->tx_skb_done, skb); |
| 242 | tasklet_schedule(&dev->tx_tasklet); |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 243 | |
| 244 | if (q->used == q->entries - q->entries / 8) |
| 245 | ieee80211_wake_queue(dev->hw, skb_get_queue_mapping(skb)); |
| 246 | |
| 247 | q->start = (q->start + 1) % q->entries; |
| 248 | q->used--; |
Jakub Kicinski | 4513493 | 2015-07-31 15:04:48 +0200 | [diff] [blame] | 249 | out: |
| 250 | spin_unlock_irqrestore(&dev->tx_lock, flags); |
| 251 | } |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 252 | |
Jakub Kicinski | 4513493 | 2015-07-31 15:04:48 +0200 | [diff] [blame] | 253 | static void mt7601u_tx_tasklet(unsigned long data) |
| 254 | { |
| 255 | struct mt7601u_dev *dev = (struct mt7601u_dev *) data; |
| 256 | struct sk_buff_head skbs; |
| 257 | unsigned long flags; |
| 258 | |
| 259 | __skb_queue_head_init(&skbs); |
| 260 | |
| 261 | spin_lock_irqsave(&dev->tx_lock, flags); |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 262 | |
| 263 | set_bit(MT7601U_STATE_MORE_STATS, &dev->state); |
| 264 | if (!test_and_set_bit(MT7601U_STATE_READING_STATS, &dev->state)) |
| 265 | queue_delayed_work(dev->stat_wq, &dev->stat_work, |
| 266 | msecs_to_jiffies(10)); |
Jakub Kicinski | 4513493 | 2015-07-31 15:04:48 +0200 | [diff] [blame] | 267 | |
| 268 | skb_queue_splice_init(&dev->tx_skb_done, &skbs); |
| 269 | |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 270 | spin_unlock_irqrestore(&dev->tx_lock, flags); |
Jakub Kicinski | 4513493 | 2015-07-31 15:04:48 +0200 | [diff] [blame] | 271 | |
| 272 | while (!skb_queue_empty(&skbs)) { |
| 273 | struct sk_buff *skb = __skb_dequeue(&skbs); |
| 274 | |
| 275 | mt7601u_tx_status(dev, skb); |
| 276 | } |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 277 | } |
| 278 | |
| 279 | static int mt7601u_dma_submit_tx(struct mt7601u_dev *dev, |
| 280 | struct sk_buff *skb, u8 ep) |
| 281 | { |
| 282 | struct usb_device *usb_dev = mt7601u_to_usb_dev(dev); |
| 283 | unsigned snd_pipe = usb_sndbulkpipe(usb_dev, dev->out_eps[ep]); |
| 284 | struct mt7601u_dma_buf_tx *e; |
| 285 | struct mt7601u_tx_queue *q = &dev->tx_q[ep]; |
| 286 | unsigned long flags; |
| 287 | int ret; |
| 288 | |
| 289 | spin_lock_irqsave(&dev->tx_lock, flags); |
| 290 | |
| 291 | if (WARN_ON(q->entries <= q->used)) { |
| 292 | ret = -ENOSPC; |
| 293 | goto out; |
| 294 | } |
| 295 | |
| 296 | e = &q->e[q->end]; |
| 297 | e->skb = skb; |
| 298 | usb_fill_bulk_urb(e->urb, usb_dev, snd_pipe, skb->data, skb->len, |
| 299 | mt7601u_complete_tx, q); |
| 300 | ret = usb_submit_urb(e->urb, GFP_ATOMIC); |
| 301 | if (ret) { |
| 302 | /* Special-handle ENODEV from TX urb submission because it will |
| 303 | * often be the first ENODEV we see after device is removed. |
| 304 | */ |
| 305 | if (ret == -ENODEV) |
| 306 | set_bit(MT7601U_STATE_REMOVED, &dev->state); |
| 307 | else |
| 308 | dev_err(dev->dev, "Error: TX urb submit failed:%d\n", |
| 309 | ret); |
| 310 | goto out; |
| 311 | } |
| 312 | |
| 313 | q->end = (q->end + 1) % q->entries; |
| 314 | q->used++; |
| 315 | |
| 316 | if (q->used >= q->entries) |
| 317 | ieee80211_stop_queue(dev->hw, skb_get_queue_mapping(skb)); |
| 318 | out: |
| 319 | spin_unlock_irqrestore(&dev->tx_lock, flags); |
| 320 | |
| 321 | return ret; |
| 322 | } |
| 323 | |
| 324 | /* Map hardware Q to USB endpoint number */ |
| 325 | static u8 q2ep(u8 qid) |
| 326 | { |
| 327 | /* TODO: take management packets to queue 5 */ |
| 328 | return qid + 1; |
| 329 | } |
| 330 | |
| 331 | /* Map USB endpoint number to Q id in the DMA engine */ |
| 332 | static enum mt76_qsel ep2dmaq(u8 ep) |
| 333 | { |
| 334 | if (ep == 5) |
| 335 | return MT_QSEL_MGMT; |
| 336 | return MT_QSEL_EDCA; |
| 337 | } |
| 338 | |
| 339 | int mt7601u_dma_enqueue_tx(struct mt7601u_dev *dev, struct sk_buff *skb, |
| 340 | struct mt76_wcid *wcid, int hw_q) |
| 341 | { |
| 342 | u8 ep = q2ep(hw_q); |
| 343 | u32 dma_flags; |
| 344 | int ret; |
| 345 | |
| 346 | dma_flags = MT_TXD_PKT_INFO_80211; |
| 347 | if (wcid->hw_key_idx == 0xff) |
| 348 | dma_flags |= MT_TXD_PKT_INFO_WIV; |
| 349 | |
| 350 | ret = mt7601u_dma_skb_wrap_pkt(skb, ep2dmaq(ep), dma_flags); |
| 351 | if (ret) |
| 352 | return ret; |
| 353 | |
| 354 | ret = mt7601u_dma_submit_tx(dev, skb, ep); |
| 355 | if (ret) { |
| 356 | ieee80211_free_txskb(dev->hw, skb); |
| 357 | return ret; |
| 358 | } |
| 359 | |
| 360 | return 0; |
| 361 | } |
| 362 | |
| 363 | static void mt7601u_kill_rx(struct mt7601u_dev *dev) |
| 364 | { |
| 365 | int i; |
| 366 | unsigned long flags; |
| 367 | |
| 368 | spin_lock_irqsave(&dev->rx_lock, flags); |
| 369 | |
| 370 | for (i = 0; i < dev->rx_q.entries; i++) { |
| 371 | int next = dev->rx_q.end; |
| 372 | |
| 373 | spin_unlock_irqrestore(&dev->rx_lock, flags); |
| 374 | usb_poison_urb(dev->rx_q.e[next].urb); |
| 375 | spin_lock_irqsave(&dev->rx_lock, flags); |
| 376 | } |
| 377 | |
| 378 | spin_unlock_irqrestore(&dev->rx_lock, flags); |
| 379 | } |
| 380 | |
| 381 | static int mt7601u_submit_rx_buf(struct mt7601u_dev *dev, |
| 382 | struct mt7601u_dma_buf_rx *e, gfp_t gfp) |
| 383 | { |
| 384 | struct usb_device *usb_dev = mt7601u_to_usb_dev(dev); |
| 385 | u8 *buf = page_address(e->p); |
| 386 | unsigned pipe; |
| 387 | int ret; |
| 388 | |
| 389 | pipe = usb_rcvbulkpipe(usb_dev, dev->in_eps[MT_EP_IN_PKT_RX]); |
| 390 | |
| 391 | usb_fill_bulk_urb(e->urb, usb_dev, pipe, buf, MT_RX_URB_SIZE, |
| 392 | mt7601u_complete_rx, dev); |
| 393 | |
| 394 | trace_mt_submit_urb(dev, e->urb); |
| 395 | ret = usb_submit_urb(e->urb, gfp); |
| 396 | if (ret) |
| 397 | dev_err(dev->dev, "Error: submit RX URB failed:%d\n", ret); |
| 398 | |
| 399 | return ret; |
| 400 | } |
| 401 | |
| 402 | static int mt7601u_submit_rx(struct mt7601u_dev *dev) |
| 403 | { |
| 404 | int i, ret; |
| 405 | |
| 406 | for (i = 0; i < dev->rx_q.entries; i++) { |
| 407 | ret = mt7601u_submit_rx_buf(dev, &dev->rx_q.e[i], GFP_KERNEL); |
| 408 | if (ret) |
| 409 | return ret; |
| 410 | } |
| 411 | |
| 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | static void mt7601u_free_rx(struct mt7601u_dev *dev) |
| 416 | { |
| 417 | int i; |
| 418 | |
| 419 | for (i = 0; i < dev->rx_q.entries; i++) { |
| 420 | __free_pages(dev->rx_q.e[i].p, MT_RX_ORDER); |
| 421 | usb_free_urb(dev->rx_q.e[i].urb); |
| 422 | } |
| 423 | } |
| 424 | |
| 425 | static int mt7601u_alloc_rx(struct mt7601u_dev *dev) |
| 426 | { |
| 427 | int i; |
| 428 | |
| 429 | memset(&dev->rx_q, 0, sizeof(dev->rx_q)); |
| 430 | dev->rx_q.dev = dev; |
| 431 | dev->rx_q.entries = N_RX_ENTRIES; |
| 432 | |
| 433 | for (i = 0; i < N_RX_ENTRIES; i++) { |
| 434 | dev->rx_q.e[i].urb = usb_alloc_urb(0, GFP_KERNEL); |
| 435 | dev->rx_q.e[i].p = dev_alloc_pages(MT_RX_ORDER); |
| 436 | |
| 437 | if (!dev->rx_q.e[i].urb || !dev->rx_q.e[i].p) |
| 438 | return -ENOMEM; |
| 439 | } |
| 440 | |
| 441 | return 0; |
| 442 | } |
| 443 | |
| 444 | static void mt7601u_free_tx_queue(struct mt7601u_tx_queue *q) |
| 445 | { |
| 446 | int i; |
| 447 | |
| 448 | WARN_ON(q->used); |
| 449 | |
| 450 | for (i = 0; i < q->entries; i++) { |
| 451 | usb_poison_urb(q->e[i].urb); |
| 452 | usb_free_urb(q->e[i].urb); |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | static void mt7601u_free_tx(struct mt7601u_dev *dev) |
| 457 | { |
| 458 | int i; |
| 459 | |
| 460 | for (i = 0; i < __MT_EP_OUT_MAX; i++) |
| 461 | mt7601u_free_tx_queue(&dev->tx_q[i]); |
| 462 | } |
| 463 | |
| 464 | static int mt7601u_alloc_tx_queue(struct mt7601u_dev *dev, |
| 465 | struct mt7601u_tx_queue *q) |
| 466 | { |
| 467 | int i; |
| 468 | |
| 469 | q->dev = dev; |
| 470 | q->entries = N_TX_ENTRIES; |
| 471 | |
| 472 | for (i = 0; i < N_TX_ENTRIES; i++) { |
| 473 | q->e[i].urb = usb_alloc_urb(0, GFP_KERNEL); |
| 474 | if (!q->e[i].urb) |
| 475 | return -ENOMEM; |
| 476 | } |
| 477 | |
| 478 | return 0; |
| 479 | } |
| 480 | |
| 481 | static int mt7601u_alloc_tx(struct mt7601u_dev *dev) |
| 482 | { |
| 483 | int i; |
| 484 | |
| 485 | dev->tx_q = devm_kcalloc(dev->dev, __MT_EP_OUT_MAX, |
| 486 | sizeof(*dev->tx_q), GFP_KERNEL); |
| 487 | |
| 488 | for (i = 0; i < __MT_EP_OUT_MAX; i++) |
| 489 | if (mt7601u_alloc_tx_queue(dev, &dev->tx_q[i])) |
| 490 | return -ENOMEM; |
| 491 | |
| 492 | return 0; |
| 493 | } |
| 494 | |
| 495 | int mt7601u_dma_init(struct mt7601u_dev *dev) |
| 496 | { |
| 497 | int ret = -ENOMEM; |
| 498 | |
Jakub Kicinski | 4513493 | 2015-07-31 15:04:48 +0200 | [diff] [blame] | 499 | tasklet_init(&dev->tx_tasklet, mt7601u_tx_tasklet, (unsigned long) dev); |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 500 | tasklet_init(&dev->rx_tasklet, mt7601u_rx_tasklet, (unsigned long) dev); |
| 501 | |
| 502 | ret = mt7601u_alloc_tx(dev); |
| 503 | if (ret) |
| 504 | goto err; |
| 505 | ret = mt7601u_alloc_rx(dev); |
| 506 | if (ret) |
| 507 | goto err; |
| 508 | |
| 509 | ret = mt7601u_submit_rx(dev); |
| 510 | if (ret) |
| 511 | goto err; |
| 512 | |
| 513 | return 0; |
| 514 | err: |
| 515 | mt7601u_dma_cleanup(dev); |
| 516 | return ret; |
| 517 | } |
| 518 | |
| 519 | void mt7601u_dma_cleanup(struct mt7601u_dev *dev) |
| 520 | { |
| 521 | mt7601u_kill_rx(dev); |
| 522 | |
| 523 | tasklet_kill(&dev->rx_tasklet); |
| 524 | |
| 525 | mt7601u_free_rx(dev); |
| 526 | mt7601u_free_tx(dev); |
Jakub Kicinski | 4513493 | 2015-07-31 15:04:48 +0200 | [diff] [blame] | 527 | |
| 528 | tasklet_kill(&dev->tx_tasklet); |
Jakub Kicinski | c869f77 | 2015-05-26 11:16:00 +0200 | [diff] [blame] | 529 | } |