Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Intel Wireless WiMAX Connection 2400m |
| 3 | * Handle incoming traffic and deliver it to the control or data planes |
| 4 | * |
| 5 | * |
| 6 | * Copyright (C) 2007-2008 Intel Corporation. All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * |
| 12 | * * Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * * Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in |
| 16 | * the documentation and/or other materials provided with the |
| 17 | * distribution. |
| 18 | * * Neither the name of Intel Corporation nor the names of its |
| 19 | * contributors may be used to endorse or promote products derived |
| 20 | * from this software without specific prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 23 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 24 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 25 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 26 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 27 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 28 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 29 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 30 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 32 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 33 | * |
| 34 | * |
| 35 | * Intel Corporation <linux-wimax@intel.com> |
| 36 | * Yanir Lubetkin <yanirx.lubetkin@intel.com> |
| 37 | * - Initial implementation |
| 38 | * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> |
| 39 | * - Use skb_clone(), break up processing in chunks |
| 40 | * - Split transport/device specific |
| 41 | * - Make buffer size dynamic to exert less memory pressure |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 42 | * - RX reorder support |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 43 | * |
| 44 | * This handles the RX path. |
| 45 | * |
| 46 | * We receive an RX message from the bus-specific driver, which |
| 47 | * contains one or more payloads that have potentially different |
| 48 | * destinataries (data or control paths). |
| 49 | * |
| 50 | * So we just take that payload from the transport specific code in |
| 51 | * the form of an skb, break it up in chunks (a cloned skb each in the |
| 52 | * case of network packets) and pass it to netdev or to the |
| 53 | * command/ack handler (and from there to the WiMAX stack). |
| 54 | * |
| 55 | * PROTOCOL FORMAT |
| 56 | * |
| 57 | * The format of the buffer is: |
| 58 | * |
| 59 | * HEADER (struct i2400m_msg_hdr) |
| 60 | * PAYLOAD DESCRIPTOR 0 (struct i2400m_pld) |
| 61 | * PAYLOAD DESCRIPTOR 1 |
| 62 | * ... |
| 63 | * PAYLOAD DESCRIPTOR N |
| 64 | * PAYLOAD 0 (raw bytes) |
| 65 | * PAYLOAD 1 |
| 66 | * ... |
| 67 | * PAYLOAD N |
| 68 | * |
| 69 | * See tx.c for a deeper description on alignment requirements and |
| 70 | * other fun facts of it. |
| 71 | * |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 72 | * DATA PACKETS |
| 73 | * |
| 74 | * In firmwares <= v1.3, data packets have no header for RX, but they |
| 75 | * do for TX (currently unused). |
| 76 | * |
| 77 | * In firmware >= 1.4, RX packets have an extended header (16 |
| 78 | * bytes). This header conveys information for management of host |
| 79 | * reordering of packets (the device offloads storage of the packets |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 80 | * for reordering to the host). Read below for more information. |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 81 | * |
| 82 | * The header is used as dummy space to emulate an ethernet header and |
| 83 | * thus be able to act as an ethernet device without having to reallocate. |
| 84 | * |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 85 | * DATA RX REORDERING |
| 86 | * |
| 87 | * Starting in firmware v1.4, the device can deliver packets for |
| 88 | * delivery with special reordering information; this allows it to |
| 89 | * more effectively do packet management when some frames were lost in |
| 90 | * the radio traffic. |
| 91 | * |
| 92 | * Thus, for RX packets that come out of order, the device gives the |
| 93 | * driver enough information to queue them properly and then at some |
| 94 | * point, the signal to deliver the whole (or part) of the queued |
| 95 | * packets to the networking stack. There are 16 such queues. |
| 96 | * |
| 97 | * This only happens when a packet comes in with the "need reorder" |
| 98 | * flag set in the RX header. When such bit is set, the following |
| 99 | * operations might be indicated: |
| 100 | * |
| 101 | * - reset queue: send all queued packets to the OS |
| 102 | * |
| 103 | * - queue: queue a packet |
| 104 | * |
| 105 | * - update ws: update the queue's window start and deliver queued |
| 106 | * packets that meet the criteria |
| 107 | * |
| 108 | * - queue & update ws: queue a packet, update the window start and |
| 109 | * deliver queued packets that meet the criteria |
| 110 | * |
| 111 | * (delivery criteria: the packet's [normalized] sequence number is |
| 112 | * lower than the new [normalized] window start). |
| 113 | * |
| 114 | * See the i2400m_roq_*() functions for details. |
| 115 | * |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 116 | * ROADMAP |
| 117 | * |
| 118 | * i2400m_rx |
| 119 | * i2400m_rx_msg_hdr_check |
| 120 | * i2400m_rx_pl_descr_check |
| 121 | * i2400m_rx_payload |
| 122 | * i2400m_net_rx |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 123 | * i2400m_rx_edata |
| 124 | * i2400m_net_erx |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 125 | * i2400m_roq_reset |
| 126 | * i2400m_net_erx |
| 127 | * i2400m_roq_queue |
| 128 | * __i2400m_roq_queue |
| 129 | * i2400m_roq_update_ws |
| 130 | * __i2400m_roq_update_ws |
| 131 | * i2400m_net_erx |
| 132 | * i2400m_roq_queue_update_ws |
| 133 | * __i2400m_roq_queue |
| 134 | * __i2400m_roq_update_ws |
| 135 | * i2400m_net_erx |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 136 | * i2400m_rx_ctl |
| 137 | * i2400m_msg_size_check |
| 138 | * i2400m_report_hook_work [in a workqueue] |
| 139 | * i2400m_report_hook |
| 140 | * wimax_msg_to_user |
| 141 | * i2400m_rx_ctl_ack |
| 142 | * wimax_msg_to_user_alloc |
| 143 | * i2400m_rx_trace |
| 144 | * i2400m_msg_size_check |
| 145 | * wimax_msg |
| 146 | */ |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 147 | #include <linux/slab.h> |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 148 | #include <linux/kernel.h> |
| 149 | #include <linux/if_arp.h> |
| 150 | #include <linux/netdevice.h> |
| 151 | #include <linux/workqueue.h> |
Paul Gortmaker | ee40fa0 | 2011-05-27 16:14:23 -0400 | [diff] [blame] | 152 | #include <linux/export.h> |
Paul Gortmaker | 6eb07ca | 2011-09-15 19:46:05 -0400 | [diff] [blame] | 153 | #include <linux/moduleparam.h> |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 154 | #include "i2400m.h" |
| 155 | |
| 156 | |
| 157 | #define D_SUBMODULE rx |
| 158 | #include "debug-levels.h" |
| 159 | |
Prasanna S Panchamukhi | 9d7fdf1 | 2009-11-17 18:29:35 -0800 | [diff] [blame] | 160 | static int i2400m_rx_reorder_disabled; /* 0 (rx reorder enabled) by default */ |
| 161 | module_param_named(rx_reorder_disabled, i2400m_rx_reorder_disabled, int, 0644); |
| 162 | MODULE_PARM_DESC(rx_reorder_disabled, |
| 163 | "If true, RX reordering will be disabled."); |
| 164 | |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 165 | struct i2400m_report_hook_args { |
| 166 | struct sk_buff *skb_rx; |
| 167 | const struct i2400m_l3l4_hdr *l3l4_hdr; |
| 168 | size_t size; |
Inaky Perez-Gonzalez | a0beba2 | 2009-10-07 21:43:10 +0900 | [diff] [blame] | 169 | struct list_head list_node; |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 170 | }; |
| 171 | |
| 172 | |
| 173 | /* |
| 174 | * Execute i2400m_report_hook in a workqueue |
| 175 | * |
Inaky Perez-Gonzalez | a0beba2 | 2009-10-07 21:43:10 +0900 | [diff] [blame] | 176 | * Goes over the list of queued reports in i2400m->rx_reports and |
| 177 | * processes them. |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 178 | * |
Inaky Perez-Gonzalez | a0beba2 | 2009-10-07 21:43:10 +0900 | [diff] [blame] | 179 | * NOTE: refcounts on i2400m are not needed because we flush the |
| 180 | * workqueue this runs on (i2400m->work_queue) before destroying |
| 181 | * i2400m. |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 182 | */ |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 183 | void i2400m_report_hook_work(struct work_struct *ws) |
| 184 | { |
Inaky Perez-Gonzalez | a0beba2 | 2009-10-07 21:43:10 +0900 | [diff] [blame] | 185 | struct i2400m *i2400m = container_of(ws, struct i2400m, rx_report_ws); |
| 186 | struct device *dev = i2400m_dev(i2400m); |
| 187 | struct i2400m_report_hook_args *args, *args_next; |
| 188 | LIST_HEAD(list); |
| 189 | unsigned long flags; |
| 190 | |
| 191 | while (1) { |
| 192 | spin_lock_irqsave(&i2400m->rx_lock, flags); |
| 193 | list_splice_init(&i2400m->rx_reports, &list); |
| 194 | spin_unlock_irqrestore(&i2400m->rx_lock, flags); |
| 195 | if (list_empty(&list)) |
| 196 | break; |
| 197 | else |
| 198 | d_printf(1, dev, "processing queued reports\n"); |
| 199 | list_for_each_entry_safe(args, args_next, &list, list_node) { |
| 200 | d_printf(2, dev, "processing queued report %p\n", args); |
| 201 | i2400m_report_hook(i2400m, args->l3l4_hdr, args->size); |
| 202 | kfree_skb(args->skb_rx); |
| 203 | list_del(&args->list_node); |
| 204 | kfree(args); |
| 205 | } |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | |
| 210 | /* |
| 211 | * Flush the list of queued reports |
| 212 | */ |
| 213 | static |
| 214 | void i2400m_report_hook_flush(struct i2400m *i2400m) |
| 215 | { |
| 216 | struct device *dev = i2400m_dev(i2400m); |
| 217 | struct i2400m_report_hook_args *args, *args_next; |
| 218 | LIST_HEAD(list); |
| 219 | unsigned long flags; |
| 220 | |
| 221 | d_printf(1, dev, "flushing queued reports\n"); |
| 222 | spin_lock_irqsave(&i2400m->rx_lock, flags); |
| 223 | list_splice_init(&i2400m->rx_reports, &list); |
| 224 | spin_unlock_irqrestore(&i2400m->rx_lock, flags); |
| 225 | list_for_each_entry_safe(args, args_next, &list, list_node) { |
| 226 | d_printf(2, dev, "flushing queued report %p\n", args); |
| 227 | kfree_skb(args->skb_rx); |
| 228 | list_del(&args->list_node); |
| 229 | kfree(args); |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | |
| 234 | /* |
| 235 | * Queue a report for later processing |
| 236 | * |
| 237 | * @i2400m: device descriptor |
| 238 | * @skb_rx: skb that contains the payload (for reference counting) |
| 239 | * @l3l4_hdr: pointer to the control |
| 240 | * @size: size of the message |
| 241 | */ |
| 242 | static |
| 243 | void i2400m_report_hook_queue(struct i2400m *i2400m, struct sk_buff *skb_rx, |
| 244 | const void *l3l4_hdr, size_t size) |
| 245 | { |
| 246 | struct device *dev = i2400m_dev(i2400m); |
| 247 | unsigned long flags; |
| 248 | struct i2400m_report_hook_args *args; |
| 249 | |
| 250 | args = kzalloc(sizeof(*args), GFP_NOIO); |
| 251 | if (args) { |
| 252 | args->skb_rx = skb_get(skb_rx); |
| 253 | args->l3l4_hdr = l3l4_hdr; |
| 254 | args->size = size; |
| 255 | spin_lock_irqsave(&i2400m->rx_lock, flags); |
| 256 | list_add_tail(&args->list_node, &i2400m->rx_reports); |
| 257 | spin_unlock_irqrestore(&i2400m->rx_lock, flags); |
| 258 | d_printf(2, dev, "queued report %p\n", args); |
| 259 | rmb(); /* see i2400m->ready's documentation */ |
| 260 | if (likely(i2400m->ready)) /* only send if up */ |
| 261 | queue_work(i2400m->work_queue, &i2400m->rx_report_ws); |
| 262 | } else { |
| 263 | if (printk_ratelimit()) |
| 264 | dev_err(dev, "%s:%u: Can't allocate %zu B\n", |
| 265 | __func__, __LINE__, sizeof(*args)); |
| 266 | } |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 267 | } |
| 268 | |
| 269 | |
| 270 | /* |
| 271 | * Process an ack to a command |
| 272 | * |
| 273 | * @i2400m: device descriptor |
| 274 | * @payload: pointer to message |
| 275 | * @size: size of the message |
| 276 | * |
| 277 | * Pass the acknodledgment (in an skb) to the thread that is waiting |
| 278 | * for it in i2400m->msg_completion. |
| 279 | * |
| 280 | * We need to coordinate properly with the thread waiting for the |
| 281 | * ack. Check if it is waiting or if it is gone. We loose the spinlock |
| 282 | * to avoid allocating on atomic contexts (yeah, could use GFP_ATOMIC, |
| 283 | * but this is not so speed critical). |
| 284 | */ |
| 285 | static |
| 286 | void i2400m_rx_ctl_ack(struct i2400m *i2400m, |
| 287 | const void *payload, size_t size) |
| 288 | { |
| 289 | struct device *dev = i2400m_dev(i2400m); |
| 290 | struct wimax_dev *wimax_dev = &i2400m->wimax_dev; |
| 291 | unsigned long flags; |
| 292 | struct sk_buff *ack_skb; |
| 293 | |
| 294 | /* Anyone waiting for an answer? */ |
| 295 | spin_lock_irqsave(&i2400m->rx_lock, flags); |
| 296 | if (i2400m->ack_skb != ERR_PTR(-EINPROGRESS)) { |
| 297 | dev_err(dev, "Huh? reply to command with no waiters\n"); |
| 298 | goto error_no_waiter; |
| 299 | } |
| 300 | spin_unlock_irqrestore(&i2400m->rx_lock, flags); |
| 301 | |
| 302 | ack_skb = wimax_msg_alloc(wimax_dev, NULL, payload, size, GFP_KERNEL); |
| 303 | |
| 304 | /* Check waiter didn't time out waiting for the answer... */ |
| 305 | spin_lock_irqsave(&i2400m->rx_lock, flags); |
| 306 | if (i2400m->ack_skb != ERR_PTR(-EINPROGRESS)) { |
| 307 | d_printf(1, dev, "Huh? waiter for command reply cancelled\n"); |
| 308 | goto error_waiter_cancelled; |
| 309 | } |
Dan Carpenter | 3e02a06 | 2010-04-22 11:46:32 +0200 | [diff] [blame] | 310 | if (IS_ERR(ack_skb)) |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 311 | dev_err(dev, "CMD/GET/SET ack: cannot allocate SKB\n"); |
Dan Carpenter | 3e02a06 | 2010-04-22 11:46:32 +0200 | [diff] [blame] | 312 | i2400m->ack_skb = ack_skb; |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 313 | spin_unlock_irqrestore(&i2400m->rx_lock, flags); |
| 314 | complete(&i2400m->msg_completion); |
| 315 | return; |
| 316 | |
| 317 | error_waiter_cancelled: |
Dan Carpenter | 3e02a06 | 2010-04-22 11:46:32 +0200 | [diff] [blame] | 318 | if (!IS_ERR(ack_skb)) |
| 319 | kfree_skb(ack_skb); |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 320 | error_no_waiter: |
| 321 | spin_unlock_irqrestore(&i2400m->rx_lock, flags); |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 322 | } |
| 323 | |
| 324 | |
| 325 | /* |
| 326 | * Receive and process a control payload |
| 327 | * |
| 328 | * @i2400m: device descriptor |
| 329 | * @skb_rx: skb that contains the payload (for reference counting) |
| 330 | * @payload: pointer to message |
| 331 | * @size: size of the message |
| 332 | * |
| 333 | * There are two types of control RX messages: reports (asynchronous, |
| 334 | * like your every day interrupts) and 'acks' (reponses to a command, |
| 335 | * get or set request). |
| 336 | * |
| 337 | * If it is a report, we run hooks on it (to extract information for |
| 338 | * things we need to do in the driver) and then pass it over to the |
| 339 | * WiMAX stack to send it to user space. |
| 340 | * |
| 341 | * NOTE: report processing is done in a workqueue specific to the |
| 342 | * generic driver, to avoid deadlocks in the system. |
| 343 | * |
| 344 | * If it is not a report, it is an ack to a previously executed |
| 345 | * command, set or get, so wake up whoever is waiting for it from |
| 346 | * i2400m_msg_to_dev(). i2400m_rx_ctl_ack() takes care of that. |
| 347 | * |
| 348 | * Note that the sizes we pass to other functions from here are the |
| 349 | * sizes of the _l3l4_hdr + payload, not full buffer sizes, as we have |
| 350 | * verified in _msg_size_check() that they are congruent. |
| 351 | * |
| 352 | * For reports: We can't clone the original skb where the data is |
| 353 | * because we need to send this up via netlink; netlink has to add |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 354 | * headers and we can't overwrite what's preceding the payload...as |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 355 | * it is another message. So we just dup them. |
| 356 | */ |
| 357 | static |
| 358 | void i2400m_rx_ctl(struct i2400m *i2400m, struct sk_buff *skb_rx, |
| 359 | const void *payload, size_t size) |
| 360 | { |
| 361 | int result; |
| 362 | struct device *dev = i2400m_dev(i2400m); |
| 363 | const struct i2400m_l3l4_hdr *l3l4_hdr = payload; |
| 364 | unsigned msg_type; |
| 365 | |
| 366 | result = i2400m_msg_size_check(i2400m, l3l4_hdr, size); |
| 367 | if (result < 0) { |
| 368 | dev_err(dev, "HW BUG? device sent a bad message: %d\n", |
| 369 | result); |
| 370 | goto error_check; |
| 371 | } |
| 372 | msg_type = le16_to_cpu(l3l4_hdr->type); |
| 373 | d_printf(1, dev, "%s 0x%04x: %zu bytes\n", |
| 374 | msg_type & I2400M_MT_REPORT_MASK ? "REPORT" : "CMD/SET/GET", |
| 375 | msg_type, size); |
| 376 | d_dump(2, dev, l3l4_hdr, size); |
| 377 | if (msg_type & I2400M_MT_REPORT_MASK) { |
Inaky Perez-Gonzalez | a0beba2 | 2009-10-07 21:43:10 +0900 | [diff] [blame] | 378 | /* |
| 379 | * Process each report |
| 380 | * |
| 381 | * - has to be ran serialized as well |
| 382 | * |
| 383 | * - the handling might force the execution of |
| 384 | * commands. That might cause reentrancy issues with |
| 385 | * bus-specific subdrivers and workqueues, so the we |
| 386 | * run it in a separate workqueue. |
| 387 | * |
| 388 | * - when the driver is not yet ready to handle them, |
| 389 | * they are queued and at some point the queue is |
| 390 | * restarted [NOTE: we can't queue SKBs directly, as |
| 391 | * this might be a piece of a SKB, not the whole |
| 392 | * thing, and this is cheaper than cloning the |
| 393 | * SKB]. |
| 394 | * |
| 395 | * Note we don't do refcounting for the device |
| 396 | * structure; this is because before destroying |
| 397 | * 'i2400m', we make sure to flush the |
| 398 | * i2400m->work_queue, so there are no issues. |
| 399 | */ |
| 400 | i2400m_report_hook_queue(i2400m, skb_rx, l3l4_hdr, size); |
Inaky Perez-Gonzalez | 44b849d | 2009-03-30 17:51:54 -0700 | [diff] [blame] | 401 | if (unlikely(i2400m->trace_msg_from_user)) |
| 402 | wimax_msg(&i2400m->wimax_dev, "echo", |
| 403 | l3l4_hdr, size, GFP_KERNEL); |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 404 | result = wimax_msg(&i2400m->wimax_dev, NULL, l3l4_hdr, size, |
| 405 | GFP_KERNEL); |
| 406 | if (result < 0) |
| 407 | dev_err(dev, "error sending report to userspace: %d\n", |
| 408 | result); |
| 409 | } else /* an ack to a CMD, GET or SET */ |
| 410 | i2400m_rx_ctl_ack(i2400m, payload, size); |
| 411 | error_check: |
| 412 | return; |
| 413 | } |
| 414 | |
| 415 | |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 416 | /* |
| 417 | * Receive and send up a trace |
| 418 | * |
| 419 | * @i2400m: device descriptor |
| 420 | * @skb_rx: skb that contains the trace (for reference counting) |
| 421 | * @payload: pointer to trace message inside the skb |
| 422 | * @size: size of the message |
| 423 | * |
| 424 | * THe i2400m might produce trace information (diagnostics) and we |
| 425 | * send them through a different kernel-to-user pipe (to avoid |
| 426 | * clogging it). |
| 427 | * |
| 428 | * As in i2400m_rx_ctl(), we can't clone the original skb where the |
| 429 | * data is because we need to send this up via netlink; netlink has to |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 430 | * add headers and we can't overwrite what's preceding the |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 431 | * payload...as it is another message. So we just dup them. |
| 432 | */ |
| 433 | static |
| 434 | void i2400m_rx_trace(struct i2400m *i2400m, |
| 435 | const void *payload, size_t size) |
| 436 | { |
| 437 | int result; |
| 438 | struct device *dev = i2400m_dev(i2400m); |
| 439 | struct wimax_dev *wimax_dev = &i2400m->wimax_dev; |
| 440 | const struct i2400m_l3l4_hdr *l3l4_hdr = payload; |
| 441 | unsigned msg_type; |
| 442 | |
| 443 | result = i2400m_msg_size_check(i2400m, l3l4_hdr, size); |
| 444 | if (result < 0) { |
| 445 | dev_err(dev, "HW BUG? device sent a bad trace message: %d\n", |
| 446 | result); |
| 447 | goto error_check; |
| 448 | } |
| 449 | msg_type = le16_to_cpu(l3l4_hdr->type); |
| 450 | d_printf(1, dev, "Trace %s 0x%04x: %zu bytes\n", |
| 451 | msg_type & I2400M_MT_REPORT_MASK ? "REPORT" : "CMD/SET/GET", |
| 452 | msg_type, size); |
| 453 | d_dump(2, dev, l3l4_hdr, size); |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 454 | result = wimax_msg(wimax_dev, "trace", l3l4_hdr, size, GFP_KERNEL); |
| 455 | if (result < 0) |
| 456 | dev_err(dev, "error sending trace to userspace: %d\n", |
| 457 | result); |
| 458 | error_check: |
| 459 | return; |
| 460 | } |
| 461 | |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 462 | |
| 463 | /* |
| 464 | * Reorder queue data stored on skb->cb while the skb is queued in the |
| 465 | * reorder queues. |
| 466 | */ |
| 467 | struct i2400m_roq_data { |
| 468 | unsigned sn; /* Serial number for the skb */ |
| 469 | enum i2400m_cs cs; /* packet type for the skb */ |
| 470 | }; |
| 471 | |
| 472 | |
| 473 | /* |
| 474 | * ReOrder Queue |
| 475 | * |
| 476 | * @ws: Window Start; sequence number where the current window start |
| 477 | * is for this queue |
| 478 | * @queue: the skb queue itself |
| 479 | * @log: circular ring buffer used to log information about the |
| 480 | * reorder process in this queue that can be displayed in case of |
| 481 | * error to help diagnose it. |
| 482 | * |
| 483 | * This is the head for a list of skbs. In the skb->cb member of the |
| 484 | * skb when queued here contains a 'struct i2400m_roq_data' were we |
| 485 | * store the sequence number (sn) and the cs (packet type) coming from |
| 486 | * the RX payload header from the device. |
| 487 | */ |
| 488 | struct i2400m_roq |
| 489 | { |
| 490 | unsigned ws; |
| 491 | struct sk_buff_head queue; |
| 492 | struct i2400m_roq_log *log; |
| 493 | }; |
| 494 | |
| 495 | |
| 496 | static |
| 497 | void __i2400m_roq_init(struct i2400m_roq *roq) |
| 498 | { |
| 499 | roq->ws = 0; |
| 500 | skb_queue_head_init(&roq->queue); |
| 501 | } |
| 502 | |
| 503 | |
| 504 | static |
| 505 | unsigned __i2400m_roq_index(struct i2400m *i2400m, struct i2400m_roq *roq) |
| 506 | { |
| 507 | return ((unsigned long) roq - (unsigned long) i2400m->rx_roq) |
| 508 | / sizeof(*roq); |
| 509 | } |
| 510 | |
| 511 | |
| 512 | /* |
| 513 | * Normalize a sequence number based on the queue's window start |
| 514 | * |
| 515 | * nsn = (sn - ws) % 2048 |
| 516 | * |
| 517 | * Note that if @sn < @roq->ws, we still need a positive number; %'s |
| 518 | * sign is implementation specific, so we normalize it by adding 2048 |
| 519 | * to bring it to be positive. |
| 520 | */ |
| 521 | static |
| 522 | unsigned __i2400m_roq_nsn(struct i2400m_roq *roq, unsigned sn) |
| 523 | { |
| 524 | int r; |
| 525 | r = ((int) sn - (int) roq->ws) % 2048; |
| 526 | if (r < 0) |
| 527 | r += 2048; |
| 528 | return r; |
| 529 | } |
| 530 | |
| 531 | |
| 532 | /* |
| 533 | * Circular buffer to keep the last N reorder operations |
| 534 | * |
| 535 | * In case something fails, dumb then to try to come up with what |
| 536 | * happened. |
| 537 | */ |
| 538 | enum { |
| 539 | I2400M_ROQ_LOG_LENGTH = 32, |
| 540 | }; |
| 541 | |
| 542 | struct i2400m_roq_log { |
| 543 | struct i2400m_roq_log_entry { |
| 544 | enum i2400m_ro_type type; |
| 545 | unsigned ws, count, sn, nsn, new_ws; |
| 546 | } entry[I2400M_ROQ_LOG_LENGTH]; |
| 547 | unsigned in, out; |
| 548 | }; |
| 549 | |
| 550 | |
| 551 | /* Print a log entry */ |
| 552 | static |
| 553 | void i2400m_roq_log_entry_print(struct i2400m *i2400m, unsigned index, |
| 554 | unsigned e_index, |
| 555 | struct i2400m_roq_log_entry *e) |
| 556 | { |
| 557 | struct device *dev = i2400m_dev(i2400m); |
| 558 | |
| 559 | switch(e->type) { |
| 560 | case I2400M_RO_TYPE_RESET: |
| 561 | dev_err(dev, "q#%d reset ws %u cnt %u sn %u/%u" |
| 562 | " - new nws %u\n", |
| 563 | index, e->ws, e->count, e->sn, e->nsn, e->new_ws); |
| 564 | break; |
| 565 | case I2400M_RO_TYPE_PACKET: |
| 566 | dev_err(dev, "q#%d queue ws %u cnt %u sn %u/%u\n", |
| 567 | index, e->ws, e->count, e->sn, e->nsn); |
| 568 | break; |
| 569 | case I2400M_RO_TYPE_WS: |
| 570 | dev_err(dev, "q#%d update_ws ws %u cnt %u sn %u/%u" |
| 571 | " - new nws %u\n", |
| 572 | index, e->ws, e->count, e->sn, e->nsn, e->new_ws); |
| 573 | break; |
| 574 | case I2400M_RO_TYPE_PACKET_WS: |
| 575 | dev_err(dev, "q#%d queue_update_ws ws %u cnt %u sn %u/%u" |
| 576 | " - new nws %u\n", |
| 577 | index, e->ws, e->count, e->sn, e->nsn, e->new_ws); |
| 578 | break; |
| 579 | default: |
| 580 | dev_err(dev, "q#%d BUG? entry %u - unknown type %u\n", |
| 581 | index, e_index, e->type); |
| 582 | break; |
| 583 | } |
| 584 | } |
| 585 | |
| 586 | |
| 587 | static |
| 588 | void i2400m_roq_log_add(struct i2400m *i2400m, |
| 589 | struct i2400m_roq *roq, enum i2400m_ro_type type, |
| 590 | unsigned ws, unsigned count, unsigned sn, |
| 591 | unsigned nsn, unsigned new_ws) |
| 592 | { |
| 593 | struct i2400m_roq_log_entry *e; |
| 594 | unsigned cnt_idx; |
| 595 | int index = __i2400m_roq_index(i2400m, roq); |
| 596 | |
| 597 | /* if we run out of space, we eat from the end */ |
| 598 | if (roq->log->in - roq->log->out == I2400M_ROQ_LOG_LENGTH) |
| 599 | roq->log->out++; |
| 600 | cnt_idx = roq->log->in++ % I2400M_ROQ_LOG_LENGTH; |
| 601 | e = &roq->log->entry[cnt_idx]; |
| 602 | |
| 603 | e->type = type; |
| 604 | e->ws = ws; |
| 605 | e->count = count; |
| 606 | e->sn = sn; |
| 607 | e->nsn = nsn; |
| 608 | e->new_ws = new_ws; |
| 609 | |
| 610 | if (d_test(1)) |
| 611 | i2400m_roq_log_entry_print(i2400m, index, cnt_idx, e); |
| 612 | } |
| 613 | |
| 614 | |
| 615 | /* Dump all the entries in the FIFO and reinitialize it */ |
| 616 | static |
| 617 | void i2400m_roq_log_dump(struct i2400m *i2400m, struct i2400m_roq *roq) |
| 618 | { |
| 619 | unsigned cnt, cnt_idx; |
| 620 | struct i2400m_roq_log_entry *e; |
| 621 | int index = __i2400m_roq_index(i2400m, roq); |
| 622 | |
| 623 | BUG_ON(roq->log->out > roq->log->in); |
| 624 | for (cnt = roq->log->out; cnt < roq->log->in; cnt++) { |
| 625 | cnt_idx = cnt % I2400M_ROQ_LOG_LENGTH; |
| 626 | e = &roq->log->entry[cnt_idx]; |
| 627 | i2400m_roq_log_entry_print(i2400m, index, cnt_idx, e); |
| 628 | memset(e, 0, sizeof(*e)); |
| 629 | } |
| 630 | roq->log->in = roq->log->out = 0; |
| 631 | } |
| 632 | |
| 633 | |
| 634 | /* |
| 635 | * Backbone for the queuing of an skb (by normalized sequence number) |
| 636 | * |
| 637 | * @i2400m: device descriptor |
| 638 | * @roq: reorder queue where to add |
| 639 | * @skb: the skb to add |
| 640 | * @sn: the sequence number of the skb |
| 641 | * @nsn: the normalized sequence number of the skb (pre-computed by the |
| 642 | * caller from the @sn and @roq->ws). |
| 643 | * |
| 644 | * We try first a couple of quick cases: |
| 645 | * |
| 646 | * - the queue is empty |
| 647 | * - the skb would be appended to the queue |
| 648 | * |
| 649 | * These will be the most common operations. |
| 650 | * |
| 651 | * If these fail, then we have to do a sorted insertion in the queue, |
| 652 | * which is the slowest path. |
| 653 | * |
| 654 | * We don't have to acquire a reference count as we are going to own it. |
| 655 | */ |
| 656 | static |
| 657 | void __i2400m_roq_queue(struct i2400m *i2400m, struct i2400m_roq *roq, |
| 658 | struct sk_buff *skb, unsigned sn, unsigned nsn) |
| 659 | { |
| 660 | struct device *dev = i2400m_dev(i2400m); |
| 661 | struct sk_buff *skb_itr; |
| 662 | struct i2400m_roq_data *roq_data_itr, *roq_data; |
| 663 | unsigned nsn_itr; |
| 664 | |
| 665 | d_fnstart(4, dev, "(i2400m %p roq %p skb %p sn %u nsn %u)\n", |
| 666 | i2400m, roq, skb, sn, nsn); |
| 667 | |
| 668 | roq_data = (struct i2400m_roq_data *) &skb->cb; |
| 669 | BUILD_BUG_ON(sizeof(*roq_data) > sizeof(skb->cb)); |
| 670 | roq_data->sn = sn; |
| 671 | d_printf(3, dev, "ERX: roq %p [ws %u] nsn %d sn %u\n", |
| 672 | roq, roq->ws, nsn, roq_data->sn); |
| 673 | |
| 674 | /* Queues will be empty on not-so-bad environments, so try |
| 675 | * that first */ |
| 676 | if (skb_queue_empty(&roq->queue)) { |
| 677 | d_printf(2, dev, "ERX: roq %p - first one\n", roq); |
| 678 | __skb_queue_head(&roq->queue, skb); |
| 679 | goto out; |
| 680 | } |
| 681 | /* Now try append, as most of the operations will be that */ |
| 682 | skb_itr = skb_peek_tail(&roq->queue); |
| 683 | roq_data_itr = (struct i2400m_roq_data *) &skb_itr->cb; |
| 684 | nsn_itr = __i2400m_roq_nsn(roq, roq_data_itr->sn); |
| 685 | /* NSN bounds assumed correct (checked when it was queued) */ |
| 686 | if (nsn >= nsn_itr) { |
| 687 | d_printf(2, dev, "ERX: roq %p - appended after %p (nsn %d sn %u)\n", |
| 688 | roq, skb_itr, nsn_itr, roq_data_itr->sn); |
| 689 | __skb_queue_tail(&roq->queue, skb); |
| 690 | goto out; |
| 691 | } |
| 692 | /* None of the fast paths option worked. Iterate to find the |
| 693 | * right spot where to insert the packet; we know the queue is |
| 694 | * not empty, so we are not the first ones; we also know we |
| 695 | * are not going to be the last ones. The list is sorted, so |
| 696 | * we have to insert before the the first guy with an nsn_itr |
| 697 | * greater that our nsn. */ |
| 698 | skb_queue_walk(&roq->queue, skb_itr) { |
| 699 | roq_data_itr = (struct i2400m_roq_data *) &skb_itr->cb; |
| 700 | nsn_itr = __i2400m_roq_nsn(roq, roq_data_itr->sn); |
| 701 | /* NSN bounds assumed correct (checked when it was queued) */ |
| 702 | if (nsn_itr > nsn) { |
| 703 | d_printf(2, dev, "ERX: roq %p - queued before %p " |
| 704 | "(nsn %d sn %u)\n", roq, skb_itr, nsn_itr, |
| 705 | roq_data_itr->sn); |
| 706 | __skb_queue_before(&roq->queue, skb_itr, skb); |
| 707 | goto out; |
| 708 | } |
| 709 | } |
| 710 | /* If we get here, that is VERY bad -- print info to help |
| 711 | * diagnose and crash it */ |
| 712 | dev_err(dev, "SW BUG? failed to insert packet\n"); |
| 713 | dev_err(dev, "ERX: roq %p [ws %u] skb %p nsn %d sn %u\n", |
| 714 | roq, roq->ws, skb, nsn, roq_data->sn); |
| 715 | skb_queue_walk(&roq->queue, skb_itr) { |
| 716 | roq_data_itr = (struct i2400m_roq_data *) &skb_itr->cb; |
| 717 | nsn_itr = __i2400m_roq_nsn(roq, roq_data_itr->sn); |
| 718 | /* NSN bounds assumed correct (checked when it was queued) */ |
| 719 | dev_err(dev, "ERX: roq %p skb_itr %p nsn %d sn %u\n", |
| 720 | roq, skb_itr, nsn_itr, roq_data_itr->sn); |
| 721 | } |
| 722 | BUG(); |
| 723 | out: |
| 724 | d_fnend(4, dev, "(i2400m %p roq %p skb %p sn %u nsn %d) = void\n", |
| 725 | i2400m, roq, skb, sn, nsn); |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 726 | } |
| 727 | |
| 728 | |
| 729 | /* |
| 730 | * Backbone for the update window start operation |
| 731 | * |
| 732 | * @i2400m: device descriptor |
| 733 | * @roq: Reorder queue |
| 734 | * @sn: New sequence number |
| 735 | * |
| 736 | * Updates the window start of a queue; when doing so, it must deliver |
| 737 | * to the networking stack all the queued skb's whose normalized |
| 738 | * sequence number is lower than the new normalized window start. |
| 739 | */ |
| 740 | static |
| 741 | unsigned __i2400m_roq_update_ws(struct i2400m *i2400m, struct i2400m_roq *roq, |
| 742 | unsigned sn) |
| 743 | { |
| 744 | struct device *dev = i2400m_dev(i2400m); |
| 745 | struct sk_buff *skb_itr, *tmp_itr; |
| 746 | struct i2400m_roq_data *roq_data_itr; |
| 747 | unsigned new_nws, nsn_itr; |
| 748 | |
| 749 | new_nws = __i2400m_roq_nsn(roq, sn); |
Prasanna S. Panchamukhi | 0809a7b | 2010-04-13 16:36:10 -0700 | [diff] [blame] | 750 | /* |
| 751 | * For type 2(update_window_start) rx messages, there is no |
| 752 | * need to check if the normalized sequence number is greater 1023. |
| 753 | * Simply insert and deliver all packets to the host up to the |
| 754 | * window start. |
| 755 | */ |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 756 | skb_queue_walk_safe(&roq->queue, skb_itr, tmp_itr) { |
| 757 | roq_data_itr = (struct i2400m_roq_data *) &skb_itr->cb; |
| 758 | nsn_itr = __i2400m_roq_nsn(roq, roq_data_itr->sn); |
| 759 | /* NSN bounds assumed correct (checked when it was queued) */ |
| 760 | if (nsn_itr < new_nws) { |
| 761 | d_printf(2, dev, "ERX: roq %p - release skb %p " |
| 762 | "(nsn %u/%u new nws %u)\n", |
| 763 | roq, skb_itr, nsn_itr, roq_data_itr->sn, |
| 764 | new_nws); |
| 765 | __skb_unlink(skb_itr, &roq->queue); |
| 766 | i2400m_net_erx(i2400m, skb_itr, roq_data_itr->cs); |
| 767 | } |
| 768 | else |
| 769 | break; /* rest of packets all nsn_itr > nws */ |
| 770 | } |
| 771 | roq->ws = sn; |
| 772 | return new_nws; |
| 773 | } |
| 774 | |
| 775 | |
| 776 | /* |
| 777 | * Reset a queue |
| 778 | * |
| 779 | * @i2400m: device descriptor |
| 780 | * @cin: Queue Index |
| 781 | * |
| 782 | * Deliver all the packets and reset the window-start to zero. Name is |
| 783 | * kind of misleading. |
| 784 | */ |
| 785 | static |
| 786 | void i2400m_roq_reset(struct i2400m *i2400m, struct i2400m_roq *roq) |
| 787 | { |
| 788 | struct device *dev = i2400m_dev(i2400m); |
| 789 | struct sk_buff *skb_itr, *tmp_itr; |
| 790 | struct i2400m_roq_data *roq_data_itr; |
| 791 | |
| 792 | d_fnstart(2, dev, "(i2400m %p roq %p)\n", i2400m, roq); |
| 793 | i2400m_roq_log_add(i2400m, roq, I2400M_RO_TYPE_RESET, |
| 794 | roq->ws, skb_queue_len(&roq->queue), |
| 795 | ~0, ~0, 0); |
| 796 | skb_queue_walk_safe(&roq->queue, skb_itr, tmp_itr) { |
| 797 | roq_data_itr = (struct i2400m_roq_data *) &skb_itr->cb; |
| 798 | d_printf(2, dev, "ERX: roq %p - release skb %p (sn %u)\n", |
| 799 | roq, skb_itr, roq_data_itr->sn); |
| 800 | __skb_unlink(skb_itr, &roq->queue); |
| 801 | i2400m_net_erx(i2400m, skb_itr, roq_data_itr->cs); |
| 802 | } |
| 803 | roq->ws = 0; |
| 804 | d_fnend(2, dev, "(i2400m %p roq %p) = void\n", i2400m, roq); |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 805 | } |
| 806 | |
| 807 | |
| 808 | /* |
| 809 | * Queue a packet |
| 810 | * |
| 811 | * @i2400m: device descriptor |
| 812 | * @cin: Queue Index |
| 813 | * @skb: containing the packet data |
| 814 | * @fbn: First block number of the packet in @skb |
| 815 | * @lbn: Last block number of the packet in @skb |
| 816 | * |
| 817 | * The hardware is asking the driver to queue a packet for later |
| 818 | * delivery to the networking stack. |
| 819 | */ |
| 820 | static |
| 821 | void i2400m_roq_queue(struct i2400m *i2400m, struct i2400m_roq *roq, |
| 822 | struct sk_buff * skb, unsigned lbn) |
| 823 | { |
| 824 | struct device *dev = i2400m_dev(i2400m); |
| 825 | unsigned nsn, len; |
| 826 | |
| 827 | d_fnstart(2, dev, "(i2400m %p roq %p skb %p lbn %u) = void\n", |
| 828 | i2400m, roq, skb, lbn); |
| 829 | len = skb_queue_len(&roq->queue); |
| 830 | nsn = __i2400m_roq_nsn(roq, lbn); |
| 831 | if (unlikely(nsn >= 1024)) { |
| 832 | dev_err(dev, "SW BUG? queue nsn %d (lbn %u ws %u)\n", |
| 833 | nsn, lbn, roq->ws); |
| 834 | i2400m_roq_log_dump(i2400m, roq); |
Inaky Perez-Gonzalez | c931cee | 2009-10-19 16:24:56 +0900 | [diff] [blame] | 835 | i2400m_reset(i2400m, I2400M_RT_WARM); |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 836 | } else { |
| 837 | __i2400m_roq_queue(i2400m, roq, skb, lbn, nsn); |
| 838 | i2400m_roq_log_add(i2400m, roq, I2400M_RO_TYPE_PACKET, |
| 839 | roq->ws, len, lbn, nsn, ~0); |
| 840 | } |
| 841 | d_fnend(2, dev, "(i2400m %p roq %p skb %p lbn %u) = void\n", |
| 842 | i2400m, roq, skb, lbn); |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 843 | } |
| 844 | |
| 845 | |
| 846 | /* |
| 847 | * Update the window start in a reorder queue and deliver all skbs |
| 848 | * with a lower window start |
| 849 | * |
| 850 | * @i2400m: device descriptor |
| 851 | * @roq: Reorder queue |
| 852 | * @sn: New sequence number |
| 853 | */ |
| 854 | static |
| 855 | void i2400m_roq_update_ws(struct i2400m *i2400m, struct i2400m_roq *roq, |
| 856 | unsigned sn) |
| 857 | { |
| 858 | struct device *dev = i2400m_dev(i2400m); |
| 859 | unsigned old_ws, nsn, len; |
| 860 | |
| 861 | d_fnstart(2, dev, "(i2400m %p roq %p sn %u)\n", i2400m, roq, sn); |
| 862 | old_ws = roq->ws; |
| 863 | len = skb_queue_len(&roq->queue); |
| 864 | nsn = __i2400m_roq_update_ws(i2400m, roq, sn); |
| 865 | i2400m_roq_log_add(i2400m, roq, I2400M_RO_TYPE_WS, |
| 866 | old_ws, len, sn, nsn, roq->ws); |
| 867 | d_fnstart(2, dev, "(i2400m %p roq %p sn %u) = void\n", i2400m, roq, sn); |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 868 | } |
| 869 | |
| 870 | |
| 871 | /* |
| 872 | * Queue a packet and update the window start |
| 873 | * |
| 874 | * @i2400m: device descriptor |
| 875 | * @cin: Queue Index |
| 876 | * @skb: containing the packet data |
| 877 | * @fbn: First block number of the packet in @skb |
| 878 | * @sn: Last block number of the packet in @skb |
| 879 | * |
| 880 | * Note that unlike i2400m_roq_update_ws(), which sets the new window |
| 881 | * start to @sn, in here we'll set it to @sn + 1. |
| 882 | */ |
| 883 | static |
| 884 | void i2400m_roq_queue_update_ws(struct i2400m *i2400m, struct i2400m_roq *roq, |
| 885 | struct sk_buff * skb, unsigned sn) |
| 886 | { |
| 887 | struct device *dev = i2400m_dev(i2400m); |
| 888 | unsigned nsn, old_ws, len; |
| 889 | |
| 890 | d_fnstart(2, dev, "(i2400m %p roq %p skb %p sn %u)\n", |
| 891 | i2400m, roq, skb, sn); |
| 892 | len = skb_queue_len(&roq->queue); |
| 893 | nsn = __i2400m_roq_nsn(roq, sn); |
Prasanna S. Panchamukhi | 0809a7b | 2010-04-13 16:36:10 -0700 | [diff] [blame] | 894 | /* |
| 895 | * For type 3(queue_update_window_start) rx messages, there is no |
| 896 | * need to check if the normalized sequence number is greater 1023. |
| 897 | * Simply insert and deliver all packets to the host up to the |
| 898 | * window start. |
| 899 | */ |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 900 | old_ws = roq->ws; |
Prasanna S. Panchamukhi | 0809a7b | 2010-04-13 16:36:10 -0700 | [diff] [blame] | 901 | /* If the queue is empty, don't bother as we'd queue |
| 902 | * it and immediately unqueue it -- just deliver it. |
| 903 | */ |
| 904 | if (len == 0) { |
| 905 | struct i2400m_roq_data *roq_data; |
| 906 | roq_data = (struct i2400m_roq_data *) &skb->cb; |
| 907 | i2400m_net_erx(i2400m, skb, roq_data->cs); |
| 908 | } else |
| 909 | __i2400m_roq_queue(i2400m, roq, skb, sn, nsn); |
| 910 | |
| 911 | __i2400m_roq_update_ws(i2400m, roq, sn + 1); |
| 912 | i2400m_roq_log_add(i2400m, roq, I2400M_RO_TYPE_PACKET_WS, |
| 913 | old_ws, len, sn, nsn, roq->ws); |
| 914 | |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 915 | d_fnend(2, dev, "(i2400m %p roq %p skb %p sn %u) = void\n", |
| 916 | i2400m, roq, skb, sn); |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 917 | } |
| 918 | |
| 919 | |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 920 | /* |
Prasanna S. Panchamukhi | d11a6e4 | 2010-04-13 16:35:58 -0700 | [diff] [blame] | 921 | * This routine destroys the memory allocated for rx_roq, when no |
| 922 | * other thread is accessing it. Access to rx_roq is refcounted by |
| 923 | * rx_roq_refcount, hence memory allocated must be destroyed when |
| 924 | * rx_roq_refcount becomes zero. This routine gets executed when |
| 925 | * rx_roq_refcount becomes zero. |
| 926 | */ |
stephen hemminger | e3d3268 | 2010-10-04 19:59:59 +0000 | [diff] [blame] | 927 | static void i2400m_rx_roq_destroy(struct kref *ref) |
Prasanna S. Panchamukhi | d11a6e4 | 2010-04-13 16:35:58 -0700 | [diff] [blame] | 928 | { |
| 929 | unsigned itr; |
| 930 | struct i2400m *i2400m |
| 931 | = container_of(ref, struct i2400m, rx_roq_refcount); |
| 932 | for (itr = 0; itr < I2400M_RO_CIN + 1; itr++) |
| 933 | __skb_queue_purge(&i2400m->rx_roq[itr].queue); |
| 934 | kfree(i2400m->rx_roq[0].log); |
| 935 | kfree(i2400m->rx_roq); |
| 936 | i2400m->rx_roq = NULL; |
| 937 | } |
| 938 | |
| 939 | /* |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 940 | * Receive and send up an extended data packet |
| 941 | * |
| 942 | * @i2400m: device descriptor |
| 943 | * @skb_rx: skb that contains the extended data packet |
| 944 | * @single_last: 1 if the payload is the only one or the last one of |
| 945 | * the skb. |
| 946 | * @payload: pointer to the packet's data inside the skb |
| 947 | * @size: size of the payload |
| 948 | * |
| 949 | * Starting in v1.4 of the i2400m's firmware, the device can send data |
| 950 | * packets to the host in an extended format that; this incudes a 16 |
| 951 | * byte header (struct i2400m_pl_edata_hdr). Using this header's space |
| 952 | * we can fake ethernet headers for ethernet device emulation without |
| 953 | * having to copy packets around. |
| 954 | * |
| 955 | * This function handles said path. |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 956 | * |
| 957 | * |
| 958 | * Receive and send up an extended data packet that requires no reordering |
| 959 | * |
| 960 | * @i2400m: device descriptor |
| 961 | * @skb_rx: skb that contains the extended data packet |
| 962 | * @single_last: 1 if the payload is the only one or the last one of |
| 963 | * the skb. |
| 964 | * @payload: pointer to the packet's data (past the actual extended |
| 965 | * data payload header). |
| 966 | * @size: size of the payload |
| 967 | * |
| 968 | * Pass over to the networking stack a data packet that might have |
| 969 | * reordering requirements. |
| 970 | * |
| 971 | * This needs to the decide if the skb in which the packet is |
| 972 | * contained can be reused or if it needs to be cloned. Then it has to |
| 973 | * be trimmed in the edges so that the beginning is the space for eth |
| 974 | * header and then pass it to i2400m_net_erx() for the stack |
| 975 | * |
| 976 | * Assumes the caller has verified the sanity of the payload (size, |
| 977 | * etc) already. |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 978 | */ |
| 979 | static |
| 980 | void i2400m_rx_edata(struct i2400m *i2400m, struct sk_buff *skb_rx, |
| 981 | unsigned single_last, const void *payload, size_t size) |
| 982 | { |
| 983 | struct device *dev = i2400m_dev(i2400m); |
| 984 | const struct i2400m_pl_edata_hdr *hdr = payload; |
| 985 | struct net_device *net_dev = i2400m->wimax_dev.net_dev; |
| 986 | struct sk_buff *skb; |
| 987 | enum i2400m_cs cs; |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 988 | u32 reorder; |
| 989 | unsigned ro_needed, ro_type, ro_cin, ro_sn; |
| 990 | struct i2400m_roq *roq; |
| 991 | struct i2400m_roq_data *roq_data; |
Prasanna S. Panchamukhi | d11a6e4 | 2010-04-13 16:35:58 -0700 | [diff] [blame] | 992 | unsigned long flags; |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 993 | |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 994 | BUILD_BUG_ON(ETH_HLEN > sizeof(*hdr)); |
| 995 | |
| 996 | d_fnstart(2, dev, "(i2400m %p skb_rx %p single %u payload %p " |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 997 | "size %zu)\n", i2400m, skb_rx, single_last, payload, size); |
| 998 | if (size < sizeof(*hdr)) { |
| 999 | dev_err(dev, "ERX: HW BUG? message with short header (%zu " |
| 1000 | "vs %zu bytes expected)\n", size, sizeof(*hdr)); |
| 1001 | goto error; |
| 1002 | } |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1003 | |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 1004 | if (single_last) { |
| 1005 | skb = skb_get(skb_rx); |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1006 | d_printf(3, dev, "ERX: skb %p reusing\n", skb); |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 1007 | } else { |
| 1008 | skb = skb_clone(skb_rx, GFP_KERNEL); |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 1009 | if (skb == NULL) { |
| 1010 | dev_err(dev, "ERX: no memory to clone skb\n"); |
| 1011 | net_dev->stats.rx_dropped++; |
| 1012 | goto error_skb_clone; |
| 1013 | } |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1014 | d_printf(3, dev, "ERX: skb %p cloned from %p\n", skb, skb_rx); |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 1015 | } |
| 1016 | /* now we have to pull and trim so that the skb points to the |
| 1017 | * beginning of the IP packet; the netdev part will add the |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1018 | * ethernet header as needed - we know there is enough space |
| 1019 | * because we checked in i2400m_rx_edata(). */ |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 1020 | skb_pull(skb, payload + sizeof(*hdr) - (void *) skb->data); |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1021 | skb_trim(skb, (void *) skb_end_pointer(skb) - payload - sizeof(*hdr)); |
| 1022 | |
| 1023 | reorder = le32_to_cpu(hdr->reorder); |
| 1024 | ro_needed = reorder & I2400M_RO_NEEDED; |
| 1025 | cs = hdr->cs; |
| 1026 | if (ro_needed) { |
| 1027 | ro_type = (reorder >> I2400M_RO_TYPE_SHIFT) & I2400M_RO_TYPE; |
| 1028 | ro_cin = (reorder >> I2400M_RO_CIN_SHIFT) & I2400M_RO_CIN; |
| 1029 | ro_sn = (reorder >> I2400M_RO_SN_SHIFT) & I2400M_RO_SN; |
| 1030 | |
Prasanna S. Panchamukhi | d11a6e4 | 2010-04-13 16:35:58 -0700 | [diff] [blame] | 1031 | spin_lock_irqsave(&i2400m->rx_lock, flags); |
Inaky Perez-Gonzalez | 3a24934 | 2010-05-20 12:27:58 -0700 | [diff] [blame] | 1032 | if (i2400m->rx_roq == NULL) { |
Prasanna S. Panchamukhi | d11a6e4 | 2010-04-13 16:35:58 -0700 | [diff] [blame] | 1033 | kfree_skb(skb); /* rx_roq is already destroyed */ |
| 1034 | spin_unlock_irqrestore(&i2400m->rx_lock, flags); |
| 1035 | goto error; |
| 1036 | } |
Inaky Perez-Gonzalez | 3a24934 | 2010-05-20 12:27:58 -0700 | [diff] [blame] | 1037 | roq = &i2400m->rx_roq[ro_cin]; |
Prasanna S. Panchamukhi | d11a6e4 | 2010-04-13 16:35:58 -0700 | [diff] [blame] | 1038 | kref_get(&i2400m->rx_roq_refcount); |
| 1039 | spin_unlock_irqrestore(&i2400m->rx_lock, flags); |
| 1040 | |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1041 | roq_data = (struct i2400m_roq_data *) &skb->cb; |
| 1042 | roq_data->sn = ro_sn; |
| 1043 | roq_data->cs = cs; |
| 1044 | d_printf(2, dev, "ERX: reorder needed: " |
| 1045 | "type %u cin %u [ws %u] sn %u/%u len %zuB\n", |
| 1046 | ro_type, ro_cin, roq->ws, ro_sn, |
| 1047 | __i2400m_roq_nsn(roq, ro_sn), size); |
| 1048 | d_dump(2, dev, payload, size); |
| 1049 | switch(ro_type) { |
| 1050 | case I2400M_RO_TYPE_RESET: |
| 1051 | i2400m_roq_reset(i2400m, roq); |
| 1052 | kfree_skb(skb); /* no data here */ |
| 1053 | break; |
| 1054 | case I2400M_RO_TYPE_PACKET: |
| 1055 | i2400m_roq_queue(i2400m, roq, skb, ro_sn); |
| 1056 | break; |
| 1057 | case I2400M_RO_TYPE_WS: |
| 1058 | i2400m_roq_update_ws(i2400m, roq, ro_sn); |
| 1059 | kfree_skb(skb); /* no data here */ |
| 1060 | break; |
| 1061 | case I2400M_RO_TYPE_PACKET_WS: |
| 1062 | i2400m_roq_queue_update_ws(i2400m, roq, skb, ro_sn); |
| 1063 | break; |
| 1064 | default: |
| 1065 | dev_err(dev, "HW BUG? unknown reorder type %u\n", ro_type); |
| 1066 | } |
Prasanna S. Panchamukhi | d11a6e4 | 2010-04-13 16:35:58 -0700 | [diff] [blame] | 1067 | |
| 1068 | spin_lock_irqsave(&i2400m->rx_lock, flags); |
| 1069 | kref_put(&i2400m->rx_roq_refcount, i2400m_rx_roq_destroy); |
| 1070 | spin_unlock_irqrestore(&i2400m->rx_lock, flags); |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1071 | } |
| 1072 | else |
| 1073 | i2400m_net_erx(i2400m, skb, cs); |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 1074 | error_skb_clone: |
| 1075 | error: |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1076 | d_fnend(2, dev, "(i2400m %p skb_rx %p single %u payload %p " |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 1077 | "size %zu) = void\n", i2400m, skb_rx, single_last, payload, size); |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 1078 | } |
| 1079 | |
| 1080 | |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1081 | /* |
| 1082 | * Act on a received payload |
| 1083 | * |
| 1084 | * @i2400m: device instance |
| 1085 | * @skb_rx: skb where the transaction was received |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 1086 | * @single_last: 1 this is the only payload or the last one (so the |
| 1087 | * skb can be reused instead of cloned). |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1088 | * @pld: payload descriptor |
| 1089 | * @payload: payload data |
| 1090 | * |
| 1091 | * Upon reception of a payload, look at its guts in the payload |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 1092 | * descriptor and decide what to do with it. If it is a single payload |
| 1093 | * skb or if the last skb is a data packet, the skb will be referenced |
| 1094 | * and modified (so it doesn't have to be cloned). |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1095 | */ |
| 1096 | static |
| 1097 | void i2400m_rx_payload(struct i2400m *i2400m, struct sk_buff *skb_rx, |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 1098 | unsigned single_last, const struct i2400m_pld *pld, |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1099 | const void *payload) |
| 1100 | { |
| 1101 | struct device *dev = i2400m_dev(i2400m); |
| 1102 | size_t pl_size = i2400m_pld_size(pld); |
| 1103 | enum i2400m_pt pl_type = i2400m_pld_type(pld); |
| 1104 | |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 1105 | d_printf(7, dev, "RX: received payload type %u, %zu bytes\n", |
| 1106 | pl_type, pl_size); |
| 1107 | d_dump(8, dev, payload, pl_size); |
| 1108 | |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1109 | switch (pl_type) { |
| 1110 | case I2400M_PT_DATA: |
| 1111 | d_printf(3, dev, "RX: data payload %zu bytes\n", pl_size); |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 1112 | i2400m_net_rx(i2400m, skb_rx, single_last, payload, pl_size); |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1113 | break; |
| 1114 | case I2400M_PT_CTRL: |
| 1115 | i2400m_rx_ctl(i2400m, skb_rx, payload, pl_size); |
| 1116 | break; |
| 1117 | case I2400M_PT_TRACE: |
| 1118 | i2400m_rx_trace(i2400m, payload, pl_size); |
| 1119 | break; |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 1120 | case I2400M_PT_EDATA: |
| 1121 | d_printf(3, dev, "ERX: data payload %zu bytes\n", pl_size); |
| 1122 | i2400m_rx_edata(i2400m, skb_rx, single_last, payload, pl_size); |
| 1123 | break; |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1124 | default: /* Anything else shouldn't come to the host */ |
| 1125 | if (printk_ratelimit()) |
| 1126 | dev_err(dev, "RX: HW BUG? unexpected payload type %u\n", |
| 1127 | pl_type); |
| 1128 | } |
| 1129 | } |
| 1130 | |
| 1131 | |
| 1132 | /* |
| 1133 | * Check a received transaction's message header |
| 1134 | * |
| 1135 | * @i2400m: device descriptor |
| 1136 | * @msg_hdr: message header |
| 1137 | * @buf_size: size of the received buffer |
| 1138 | * |
| 1139 | * Check that the declarations done by a RX buffer message header are |
| 1140 | * sane and consistent with the amount of data that was received. |
| 1141 | */ |
| 1142 | static |
| 1143 | int i2400m_rx_msg_hdr_check(struct i2400m *i2400m, |
| 1144 | const struct i2400m_msg_hdr *msg_hdr, |
| 1145 | size_t buf_size) |
| 1146 | { |
| 1147 | int result = -EIO; |
| 1148 | struct device *dev = i2400m_dev(i2400m); |
| 1149 | if (buf_size < sizeof(*msg_hdr)) { |
| 1150 | dev_err(dev, "RX: HW BUG? message with short header (%zu " |
| 1151 | "vs %zu bytes expected)\n", buf_size, sizeof(*msg_hdr)); |
| 1152 | goto error; |
| 1153 | } |
| 1154 | if (msg_hdr->barker != cpu_to_le32(I2400M_D2H_MSG_BARKER)) { |
| 1155 | dev_err(dev, "RX: HW BUG? message received with unknown " |
| 1156 | "barker 0x%08x (buf_size %zu bytes)\n", |
| 1157 | le32_to_cpu(msg_hdr->barker), buf_size); |
| 1158 | goto error; |
| 1159 | } |
| 1160 | if (msg_hdr->num_pls == 0) { |
| 1161 | dev_err(dev, "RX: HW BUG? zero payload packets in message\n"); |
| 1162 | goto error; |
| 1163 | } |
| 1164 | if (le16_to_cpu(msg_hdr->num_pls) > I2400M_MAX_PLS_IN_MSG) { |
| 1165 | dev_err(dev, "RX: HW BUG? message contains more payload " |
| 1166 | "than maximum; ignoring.\n"); |
| 1167 | goto error; |
| 1168 | } |
| 1169 | result = 0; |
| 1170 | error: |
| 1171 | return result; |
| 1172 | } |
| 1173 | |
| 1174 | |
| 1175 | /* |
| 1176 | * Check a payload descriptor against the received data |
| 1177 | * |
| 1178 | * @i2400m: device descriptor |
| 1179 | * @pld: payload descriptor |
| 1180 | * @pl_itr: offset (in bytes) in the received buffer the payload is |
| 1181 | * located |
| 1182 | * @buf_size: size of the received buffer |
| 1183 | * |
| 1184 | * Given a payload descriptor (part of a RX buffer), check it is sane |
| 1185 | * and that the data it declares fits in the buffer. |
| 1186 | */ |
| 1187 | static |
| 1188 | int i2400m_rx_pl_descr_check(struct i2400m *i2400m, |
| 1189 | const struct i2400m_pld *pld, |
| 1190 | size_t pl_itr, size_t buf_size) |
| 1191 | { |
| 1192 | int result = -EIO; |
| 1193 | struct device *dev = i2400m_dev(i2400m); |
| 1194 | size_t pl_size = i2400m_pld_size(pld); |
| 1195 | enum i2400m_pt pl_type = i2400m_pld_type(pld); |
| 1196 | |
| 1197 | if (pl_size > i2400m->bus_pl_size_max) { |
| 1198 | dev_err(dev, "RX: HW BUG? payload @%zu: size %zu is " |
| 1199 | "bigger than maximum %zu; ignoring message\n", |
| 1200 | pl_itr, pl_size, i2400m->bus_pl_size_max); |
| 1201 | goto error; |
| 1202 | } |
| 1203 | if (pl_itr + pl_size > buf_size) { /* enough? */ |
| 1204 | dev_err(dev, "RX: HW BUG? payload @%zu: size %zu " |
| 1205 | "goes beyond the received buffer " |
| 1206 | "size (%zu bytes); ignoring message\n", |
| 1207 | pl_itr, pl_size, buf_size); |
| 1208 | goto error; |
| 1209 | } |
| 1210 | if (pl_type >= I2400M_PT_ILLEGAL) { |
| 1211 | dev_err(dev, "RX: HW BUG? illegal payload type %u; " |
| 1212 | "ignoring message\n", pl_type); |
| 1213 | goto error; |
| 1214 | } |
| 1215 | result = 0; |
| 1216 | error: |
| 1217 | return result; |
| 1218 | } |
| 1219 | |
| 1220 | |
| 1221 | /** |
| 1222 | * i2400m_rx - Receive a buffer of data from the device |
| 1223 | * |
| 1224 | * @i2400m: device descriptor |
| 1225 | * @skb: skbuff where the data has been received |
| 1226 | * |
| 1227 | * Parse in a buffer of data that contains an RX message sent from the |
| 1228 | * device. See the file header for the format. Run all checks on the |
| 1229 | * buffer header, then run over each payload's descriptors, verify |
| 1230 | * their consistency and act on each payload's contents. If |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 1231 | * everything is successful, update the device's statistics. |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1232 | * |
| 1233 | * Note: You need to set the skb to contain only the length of the |
| 1234 | * received buffer; for that, use skb_trim(skb, RECEIVED_SIZE). |
| 1235 | * |
| 1236 | * Returns: |
| 1237 | * |
| 1238 | * 0 if ok, < 0 errno on error |
| 1239 | * |
| 1240 | * If ok, this function owns now the skb and the caller DOESN'T have |
| 1241 | * to run kfree_skb() on it. However, on error, the caller still owns |
| 1242 | * the skb and it is responsible for releasing it. |
| 1243 | */ |
| 1244 | int i2400m_rx(struct i2400m *i2400m, struct sk_buff *skb) |
| 1245 | { |
| 1246 | int i, result; |
| 1247 | struct device *dev = i2400m_dev(i2400m); |
| 1248 | const struct i2400m_msg_hdr *msg_hdr; |
Jiri Slaby | 0aa7dea | 2010-10-10 23:26:58 +0000 | [diff] [blame] | 1249 | size_t pl_itr, pl_size; |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1250 | unsigned long flags; |
Jiri Slaby | 0aa7dea | 2010-10-10 23:26:58 +0000 | [diff] [blame] | 1251 | unsigned num_pls, single_last, skb_len; |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1252 | |
| 1253 | skb_len = skb->len; |
Jiri Slaby | 0aa7dea | 2010-10-10 23:26:58 +0000 | [diff] [blame] | 1254 | d_fnstart(4, dev, "(i2400m %p skb %p [size %u])\n", |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1255 | i2400m, skb, skb_len); |
| 1256 | result = -EIO; |
| 1257 | msg_hdr = (void *) skb->data; |
Jiri Slaby | 0aa7dea | 2010-10-10 23:26:58 +0000 | [diff] [blame] | 1258 | result = i2400m_rx_msg_hdr_check(i2400m, msg_hdr, skb_len); |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1259 | if (result < 0) |
| 1260 | goto error_msg_hdr_check; |
| 1261 | result = -EIO; |
| 1262 | num_pls = le16_to_cpu(msg_hdr->num_pls); |
| 1263 | pl_itr = sizeof(*msg_hdr) + /* Check payload descriptor(s) */ |
| 1264 | num_pls * sizeof(msg_hdr->pld[0]); |
Inaky Perez-Gonzalez | 8593a19 | 2009-05-20 16:53:30 -0700 | [diff] [blame] | 1265 | pl_itr = ALIGN(pl_itr, I2400M_PL_ALIGN); |
Jiri Slaby | 0aa7dea | 2010-10-10 23:26:58 +0000 | [diff] [blame] | 1266 | if (pl_itr > skb_len) { /* got all the payload descriptors? */ |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1267 | dev_err(dev, "RX: HW BUG? message too short (%u bytes) for " |
| 1268 | "%u payload descriptors (%zu each, total %zu)\n", |
Jiri Slaby | 0aa7dea | 2010-10-10 23:26:58 +0000 | [diff] [blame] | 1269 | skb_len, num_pls, sizeof(msg_hdr->pld[0]), pl_itr); |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1270 | goto error_pl_descr_short; |
| 1271 | } |
| 1272 | /* Walk each payload payload--check we really got it */ |
| 1273 | for (i = 0; i < num_pls; i++) { |
| 1274 | /* work around old gcc warnings */ |
| 1275 | pl_size = i2400m_pld_size(&msg_hdr->pld[i]); |
| 1276 | result = i2400m_rx_pl_descr_check(i2400m, &msg_hdr->pld[i], |
Jiri Slaby | 0aa7dea | 2010-10-10 23:26:58 +0000 | [diff] [blame] | 1277 | pl_itr, skb_len); |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1278 | if (result < 0) |
| 1279 | goto error_pl_descr_check; |
Inaky Perez-Gonzalez | fd5c565 | 2009-02-28 23:42:52 +0000 | [diff] [blame] | 1280 | single_last = num_pls == 1 || i == num_pls - 1; |
| 1281 | i2400m_rx_payload(i2400m, skb, single_last, &msg_hdr->pld[i], |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1282 | skb->data + pl_itr); |
Inaky Perez-Gonzalez | 8593a19 | 2009-05-20 16:53:30 -0700 | [diff] [blame] | 1283 | pl_itr += ALIGN(pl_size, I2400M_PL_ALIGN); |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1284 | cond_resched(); /* Don't monopolize */ |
| 1285 | } |
| 1286 | kfree_skb(skb); |
| 1287 | /* Update device statistics */ |
| 1288 | spin_lock_irqsave(&i2400m->rx_lock, flags); |
| 1289 | i2400m->rx_pl_num += i; |
| 1290 | if (i > i2400m->rx_pl_max) |
| 1291 | i2400m->rx_pl_max = i; |
| 1292 | if (i < i2400m->rx_pl_min) |
| 1293 | i2400m->rx_pl_min = i; |
| 1294 | i2400m->rx_num++; |
Jiri Slaby | 0aa7dea | 2010-10-10 23:26:58 +0000 | [diff] [blame] | 1295 | i2400m->rx_size_acc += skb_len; |
| 1296 | if (skb_len < i2400m->rx_size_min) |
| 1297 | i2400m->rx_size_min = skb_len; |
| 1298 | if (skb_len > i2400m->rx_size_max) |
| 1299 | i2400m->rx_size_max = skb_len; |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1300 | spin_unlock_irqrestore(&i2400m->rx_lock, flags); |
| 1301 | error_pl_descr_check: |
| 1302 | error_pl_descr_short: |
| 1303 | error_msg_hdr_check: |
Jiri Slaby | 0aa7dea | 2010-10-10 23:26:58 +0000 | [diff] [blame] | 1304 | d_fnend(4, dev, "(i2400m %p skb %p [size %u]) = %d\n", |
Inaky Perez-Gonzalez | aa5a7ac | 2008-12-20 16:57:47 -0800 | [diff] [blame] | 1305 | i2400m, skb, skb_len, result); |
| 1306 | return result; |
| 1307 | } |
| 1308 | EXPORT_SYMBOL_GPL(i2400m_rx); |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1309 | |
| 1310 | |
Inaky Perez-Gonzalez | aba3792 | 2009-09-03 15:14:29 -0700 | [diff] [blame] | 1311 | void i2400m_unknown_barker(struct i2400m *i2400m, |
| 1312 | const void *buf, size_t size) |
| 1313 | { |
| 1314 | struct device *dev = i2400m_dev(i2400m); |
| 1315 | char prefix[64]; |
| 1316 | const __le32 *barker = buf; |
| 1317 | dev_err(dev, "RX: HW BUG? unknown barker %08x, " |
| 1318 | "dropping %zu bytes\n", le32_to_cpu(*barker), size); |
| 1319 | snprintf(prefix, sizeof(prefix), "%s %s: ", |
| 1320 | dev_driver_string(dev), dev_name(dev)); |
| 1321 | if (size > 64) { |
| 1322 | print_hex_dump(KERN_ERR, prefix, DUMP_PREFIX_OFFSET, |
| 1323 | 8, 4, buf, 64, 0); |
| 1324 | printk(KERN_ERR "%s... (only first 64 bytes " |
| 1325 | "dumped)\n", prefix); |
| 1326 | } else |
| 1327 | print_hex_dump(KERN_ERR, prefix, DUMP_PREFIX_OFFSET, |
| 1328 | 8, 4, buf, size, 0); |
| 1329 | } |
| 1330 | EXPORT_SYMBOL(i2400m_unknown_barker); |
| 1331 | |
| 1332 | |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1333 | /* |
| 1334 | * Initialize the RX queue and infrastructure |
| 1335 | * |
| 1336 | * This sets up all the RX reordering infrastructures, which will not |
| 1337 | * be used if reordering is not enabled or if the firmware does not |
| 1338 | * support it. The device is told to do reordering in |
| 1339 | * i2400m_dev_initialize(), where it also looks at the value of the |
| 1340 | * i2400m->rx_reorder switch before taking a decission. |
| 1341 | * |
| 1342 | * Note we allocate the roq queues in one chunk and the actual logging |
| 1343 | * support for it (logging) in another one and then we setup the |
| 1344 | * pointers from the first to the last. |
| 1345 | */ |
| 1346 | int i2400m_rx_setup(struct i2400m *i2400m) |
| 1347 | { |
| 1348 | int result = 0; |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1349 | |
| 1350 | i2400m->rx_reorder = i2400m_rx_reorder_disabled? 0 : 1; |
| 1351 | if (i2400m->rx_reorder) { |
| 1352 | unsigned itr; |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1353 | struct i2400m_roq_log *rd; |
| 1354 | |
| 1355 | result = -ENOMEM; |
| 1356 | |
Joe Perches | 9d11bd1 | 2013-02-03 17:28:13 +0000 | [diff] [blame] | 1357 | i2400m->rx_roq = kcalloc(I2400M_RO_CIN + 1, |
| 1358 | sizeof(i2400m->rx_roq[0]), GFP_KERNEL); |
| 1359 | if (i2400m->rx_roq == NULL) |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1360 | goto error_roq_alloc; |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1361 | |
Joe Perches | 9d11bd1 | 2013-02-03 17:28:13 +0000 | [diff] [blame] | 1362 | rd = kcalloc(I2400M_RO_CIN + 1, sizeof(*i2400m->rx_roq[0].log), |
| 1363 | GFP_KERNEL); |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1364 | if (rd == NULL) { |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1365 | result = -ENOMEM; |
| 1366 | goto error_roq_log_alloc; |
| 1367 | } |
| 1368 | |
| 1369 | for(itr = 0; itr < I2400M_RO_CIN + 1; itr++) { |
| 1370 | __i2400m_roq_init(&i2400m->rx_roq[itr]); |
| 1371 | i2400m->rx_roq[itr].log = &rd[itr]; |
| 1372 | } |
Prasanna S. Panchamukhi | d11a6e4 | 2010-04-13 16:35:58 -0700 | [diff] [blame] | 1373 | kref_init(&i2400m->rx_roq_refcount); |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1374 | } |
| 1375 | return 0; |
| 1376 | |
| 1377 | error_roq_log_alloc: |
| 1378 | kfree(i2400m->rx_roq); |
| 1379 | error_roq_alloc: |
| 1380 | return result; |
| 1381 | } |
| 1382 | |
| 1383 | |
| 1384 | /* Tear down the RX queue and infrastructure */ |
| 1385 | void i2400m_rx_release(struct i2400m *i2400m) |
| 1386 | { |
Prasanna S. Panchamukhi | d11a6e4 | 2010-04-13 16:35:58 -0700 | [diff] [blame] | 1387 | unsigned long flags; |
| 1388 | |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1389 | if (i2400m->rx_reorder) { |
Prasanna S. Panchamukhi | d11a6e4 | 2010-04-13 16:35:58 -0700 | [diff] [blame] | 1390 | spin_lock_irqsave(&i2400m->rx_lock, flags); |
| 1391 | kref_put(&i2400m->rx_roq_refcount, i2400m_rx_roq_destroy); |
| 1392 | spin_unlock_irqrestore(&i2400m->rx_lock, flags); |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1393 | } |
Inaky Perez-Gonzalez | a0beba2 | 2009-10-07 21:43:10 +0900 | [diff] [blame] | 1394 | /* at this point, nothing can be received... */ |
| 1395 | i2400m_report_hook_flush(i2400m); |
Inaky Perez-Gonzalez | c747583 | 2009-02-28 23:42:54 +0000 | [diff] [blame] | 1396 | } |