| 1 | |
| 2 | /* |
| 3 | * Copyright 2010-2017 Intel Corporation. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License, version 2, |
| 7 | * as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * General Public License for more details. |
| 13 | * |
| 14 | * Disclaimer: The codes contained in these modules may be specific to |
| 15 | * the Intel Software Development Platform codenamed Knights Ferry, |
| 16 | * and the Intel product codenamed Knights Corner, and are not backward |
| 17 | * compatible with other Intel products. Additionally, Intel will NOT |
| 18 | * support the codes or instruction set in future products. |
| 19 | * |
| 20 | * Intel offers no warranty of any kind regarding the code. This code is |
| 21 | * licensed on an "AS IS" basis and Intel is not obligated to provide |
| 22 | * any support, assistance, installation, training, or other services |
| 23 | * of any kind. Intel is also not obligated to provide any updates, |
| 24 | * enhancements or extensions. Intel specifically disclaims any warranty |
| 25 | * of merchantability, non-infringement, fitness for any particular |
| 26 | * purpose, and any other warranty. |
| 27 | * |
| 28 | * Further, Intel disclaims all liability of any kind, including but |
| 29 | * not limited to liability for infringement of any proprietary rights, |
| 30 | * relating to the use of the code, even if Intel is notified of the |
| 31 | * possibility of such liability. Except as expressly stated in an Intel |
| 32 | * license agreement provided with this code and agreed upon with Intel, |
| 33 | * no license, express or implied, by estoppel or otherwise, to any |
| 34 | * intellectual property rights is granted herein. |
| 35 | */ |
| 36 | |
| 37 | #include <linux/ip.h> |
| 38 | #include <linux/tcp.h> |
| 39 | #include <linux/list.h> |
| 40 | #include <linux/circ_buf.h> |
| 41 | #include <linux/reboot.h> |
| 42 | #include "mic_common.h" |
| 43 | #include "mic/micveth_dma.h" |
| 44 | #include "mic/mic_macaddr.h" |
| 45 | |
| 46 | /* TODO: Clean up shutdown, let DMA's drain */ |
| 47 | |
| 48 | #ifndef HOST |
| 49 | #define SBOX_SDBIC0_DBREQ_BIT 0x80000000 |
| 50 | #define SBOX_MMIO_LENGTH (64 * 1024) |
| 51 | #endif |
| 52 | #define STOP_WAIT_TIMEOUT (4 * HZ) |
| 53 | |
| 54 | #ifndef HOST |
| 55 | static mic_ctx_t mic_ctx_g; |
| 56 | #endif |
| 57 | |
| 58 | struct micvnet micvnet; |
| 59 | |
| 60 | |
| 61 | static void micvnet_send_intr(struct micvnet_info *vnet_info); |
| 62 | static int micvnet_init_msg_rings(struct micvnet_info *vnet_info); |
| 63 | static int micvnet_init_rx_skb_send_msg(struct micvnet_info *vnet_info); |
| 64 | static void micvnet_send_add_dma_buffer_messages(struct micvnet_info *vnet_info); |
| 65 | static void micvnet_stop_ws(struct work_struct *work); |
| 66 | static void micvnet_start_ws(struct work_struct *work); |
| 67 | int get_sbox_irq(int index); |
| 68 | |
| 69 | static __always_inline mic_ctx_t * |
| 70 | vnet_to_ctx(struct micvnet_info *vnet_info) |
| 71 | { |
| 72 | return vnet_info->mic_ctx; |
| 73 | } |
| 74 | |
| 75 | static __always_inline void |
| 76 | micvnet_wake_queue(struct micvnet_info *vnet_info) |
| 77 | { |
| 78 | if (atomic_read(&vnet_info->vi_state) == MICVNET_STATE_LINKUP) |
| 79 | netif_wake_queue(vnet_info->vi_netdev); |
| 80 | } |
| 81 | |
| 82 | static __always_inline void |
| 83 | micvnet_dec_cnt_tx_pending(struct micvnet_info *vnet_info) |
| 84 | { |
| 85 | if (atomic_dec_and_test(&vnet_info->cnt_tx_pending) && |
| 86 | (atomic_read(&vnet_info->vi_state) == MICVNET_STATE_LINK_DOWN)) |
| 87 | wake_up_interruptible(&vnet_info->stop_waitq); |
| 88 | } |
| 89 | |
| 90 | |
| 91 | /*********************************************************** |
| 92 | Pre-allocated "list" of objects which are allocated and deallocated in FIFO |
| 93 | sequence. Allows reservation of memory at init time to prevent mem allocation |
| 94 | failures at run time. */ |
| 95 | static int |
| 96 | list_obj_list_init(int num_obj, size_t obj_size, struct obj_list *list) |
| 97 | { |
| 98 | list->size = num_obj + 1; |
| 99 | list->obj_size = obj_size; |
| 100 | list->head = list->tail = 0; |
| 101 | |
| 102 | if (!(list->buf = kmalloc(list->size * list->obj_size, GFP_KERNEL))) { |
| 103 | printk(KERN_ERR "%s: list alloc failed\n", __func__); |
| 104 | return -ENOMEM; |
| 105 | } |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | static void |
| 110 | list_obj_list_deinit(struct obj_list *list) |
| 111 | { |
| 112 | if (list->buf) { |
| 113 | kfree(list->buf); |
| 114 | list->buf = NULL; |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | static void * |
| 119 | list_obj_alloc(struct obj_list *list) |
| 120 | { |
| 121 | char *obj; |
| 122 | |
| 123 | /* Remove bug_on() here to handle VNET OOO messages. In OOO conditions |
| 124 | * requests to allocate more objects than list->size are possible. */ |
| 125 | if (((list->head + 1) % list->size) == list->tail) { |
| 126 | printk(KERN_ERR "%s: BUG: no free objects in obj list\n", __func__); |
| 127 | return NULL; |
| 128 | } |
| 129 | |
| 130 | obj = list->buf + list->head * list->obj_size; |
| 131 | wmb(); |
| 132 | list->head = (list->head + 1) % list->size; |
| 133 | |
| 134 | return obj; |
| 135 | } |
| 136 | |
| 137 | void |
| 138 | list_obj_free(struct obj_list *list) |
| 139 | { |
| 140 | /* Remove bug_on() here to handle VNET OOO messages */ |
| 141 | if (list->tail == list->head) { |
| 142 | printk(KERN_ERR "%s: BUG: free too many list objects\n", __func__); |
| 143 | return; |
| 144 | } |
| 145 | |
| 146 | list->tail = (list->tail + 1) % list->size; |
| 147 | } |
| 148 | |
| 149 | /*********************************************************** |
| 150 | * Vnet message functions |
| 151 | */ |
| 152 | #ifdef HOST |
| 153 | static void |
| 154 | micvnet_msg_rb_init(struct micvnet_msg_rb *rb) |
| 155 | { |
| 156 | rb->head = rb->tail = 0; |
| 157 | rb->size = MICVNET_MSG_RB_SIZE; |
| 158 | rb->prev_head = rb->prev_tail = rb->size - 1; |
| 159 | } |
| 160 | |
| 161 | static void |
| 162 | micvnet_reset_msg_rings(struct micvnet_info *vnet_info) |
| 163 | { |
| 164 | micvnet_msg_rb_init(vnet_info->vi_qp.tx); |
| 165 | micvnet_msg_rb_init(vnet_info->vi_qp.rx); |
| 166 | } |
| 167 | #endif |
| 168 | |
| 169 | static void |
| 170 | micvnet_msg_rb_write_msg(struct micvnet_info *vnet_info, struct micvnet_msg *msg) |
| 171 | { |
| 172 | struct micvnet_msg_rb *rb = vnet_info->vi_qp.tx; |
| 173 | |
| 174 | /* The condition below should never occur under normal conditions |
| 175 | because the VNET message ring buffer size is at least 1 greater than |
| 176 | the maximum total number of outstanding messages possible in the |
| 177 | system. However, all bets are off if VNET OOO messages are |
| 178 | seen. Therefore remove the previous bug_on() here and busy wait. */ |
| 179 | while (((rb->head + 1) % rb->size) == rb->tail) |
| 180 | cpu_relax(); |
| 181 | |
| 182 | if (!(rb->head == (rb->prev_head + 1) % rb->size)) |
| 183 | printk(KERN_ERR "BUG: head not equal to prev_head + 1:\n \ |
| 184 | head %d prev_head %d\n", rb->head, rb->prev_head); |
| 185 | |
| 186 | smp_mb(); |
| 187 | #ifdef HOST |
| 188 | rb->buf[rb->head] = *msg; |
| 189 | #else |
| 190 | memcpy_toio(&rb->buf[rb->head], msg, sizeof(*msg)); |
| 191 | #endif |
| 192 | smp_mb(); |
| 193 | serializing_request(&rb->buf[rb->head]); |
| 194 | |
| 195 | rb->prev_head = rb->head; |
| 196 | rb->head = (rb->head + 1) % rb->size; |
| 197 | #ifndef HOST |
| 198 | rb->head = rb->head; |
| 199 | #endif |
| 200 | smp_mb(); |
| 201 | serializing_request(&rb->head); |
| 202 | } |
| 203 | |
| 204 | static int |
| 205 | micvnet_msg_rb_read_msg(struct micvnet_info *vnet_info, struct micvnet_msg *msg) |
| 206 | { |
| 207 | struct micvnet_msg_rb *rb = vnet_info->vi_qp.rx; |
| 208 | |
| 209 | if (rb->tail == rb->head) |
| 210 | return 1; |
| 211 | |
| 212 | if (!(rb->tail == (rb->prev_tail + 1) % rb->size)) |
| 213 | printk(KERN_ERR "BUG: tail not equal to prev_tail + 1:\n \ |
| 214 | tail %d prev_tail %d\n", rb->tail, rb->prev_tail); |
| 215 | |
| 216 | smp_mb(); |
| 217 | #ifdef HOST |
| 218 | *msg = rb->buf[rb->tail]; |
| 219 | #else |
| 220 | memcpy_fromio(msg, &rb->buf[rb->tail], sizeof(*msg)); |
| 221 | #endif |
| 222 | smp_mb(); |
| 223 | serializing_request(&rb->buf[rb->tail]); |
| 224 | |
| 225 | rb->prev_tail = rb->tail; |
| 226 | rb->tail = (rb->tail + 1) % rb->size; |
| 227 | #ifndef HOST |
| 228 | rb->tail = rb->tail; |
| 229 | #endif |
| 230 | smp_mb(); |
| 231 | serializing_request(&rb->tail); |
| 232 | |
| 233 | return 0; |
| 234 | } |
| 235 | |
| 236 | void |
| 237 | micvnet_msg_send_msg(struct micvnet_info *vnet_info, struct micvnet_msg *msg) |
| 238 | { |
| 239 | micvnet_msg_rb_write_msg(vnet_info, msg); |
| 240 | #ifdef HOST |
| 241 | if (micpm_get_reference(vnet_to_ctx(vnet_info), true)) |
| 242 | return; |
| 243 | #endif |
| 244 | micvnet_send_intr(vnet_info); |
| 245 | #ifdef HOST |
| 246 | micpm_put_reference(vnet_to_ctx(vnet_info)); |
| 247 | #endif |
| 248 | } |
| 249 | |
| 250 | static void |
| 251 | micvnet_msg_send_add_dma_buffer_msg(struct micvnet_info *vnet_info, |
| 252 | struct rx_node *rnode) |
| 253 | { |
| 254 | struct micvnet_msg msg; |
| 255 | struct micvnet_msg_add_dma_buffer |
| 256 | *body = &msg.body.micvnet_msg_add_dma_buffer; |
| 257 | |
| 258 | msg.msg_id = MICVNET_MSG_ADD_DMA_BUFFER; |
| 259 | body->buf_phys = rnode->phys; |
| 260 | body->buf_size = rnode->size; |
| 261 | micvnet_msg_send_msg(vnet_info, &msg); |
| 262 | } |
| 263 | |
| 264 | static void |
| 265 | micvnet_msg_recv_add_dma_buffer(struct micvnet_info *vnet_info, |
| 266 | struct micvnet_msg_add_dma_buffer *msg) |
| 267 | { |
| 268 | struct dma_node *dnode; |
| 269 | |
| 270 | /* Remove bug_on() here to handle VNET OOO messages */ |
| 271 | if (!(dnode = list_obj_alloc(&vnet_info->dnode_list))) |
| 272 | return; |
| 273 | |
| 274 | dnode->phys = msg->buf_phys; |
| 275 | dnode->size = msg->buf_size; |
| 276 | |
| 277 | spin_lock(&vnet_info->vi_rxlock); |
| 278 | list_add_tail(&dnode->list, &vnet_info->vi_dma_buf); |
| 279 | spin_unlock(&vnet_info->vi_rxlock); |
| 280 | |
| 281 | atomic_inc(&vnet_info->cnt_dma_buf_avail); |
| 282 | micvnet_wake_queue(vnet_info); |
| 283 | } |
| 284 | |
| 285 | static void |
| 286 | micvnet_msg_send_dma_complete_msg(struct micvnet_info *vnet_info, |
| 287 | struct sched_node *snode) |
| 288 | { |
| 289 | struct micvnet_msg msg; |
| 290 | struct micvnet_msg_dma_complete |
| 291 | *body = &msg.body.micvnet_msg_dma_complete; |
| 292 | |
| 293 | msg.msg_id = MICVNET_MSG_DMA_COMPLETE; |
| 294 | body->dst_phys = snode->dst_phys; |
| 295 | body->size = snode->skb->len; |
| 296 | body->dma_offset = snode->dma_offset; |
| 297 | micvnet_msg_send_msg(vnet_info, &msg); |
| 298 | } |
| 299 | |
| 300 | /* Handle an unexpected out-of-order message */ |
| 301 | static int |
| 302 | micvnet_msg_handle_ooo_msg(struct micvnet_info *vnet_info, |
| 303 | struct micvnet_msg_dma_complete *msg) |
| 304 | { |
| 305 | struct micvnet_msg_rb *rb = vnet_info->vi_qp.rx; |
| 306 | struct rx_node *rnode; |
| 307 | struct list_head *pos, *tmpl; |
| 308 | bool found = false; |
| 309 | |
| 310 | rnode = list_entry((&vnet_info->vi_rx_skb)->next, struct rx_node, list); |
| 311 | |
| 312 | /* Normal operation */ |
| 313 | if (rnode->phys == msg->dst_phys |
| 314 | && msg->size <= (rnode->size - 3 * DMA_ALIGNMENT) |
| 315 | && msg->dma_offset < 2 * DMA_ALIGNMENT) |
| 316 | return 0; |
| 317 | |
| 318 | /* Flag that weird stuff's going on */ |
| 319 | printk(KERN_ERR "BUG: Unexpected vnet dma_complete message parameters:\n \ |
| 320 | rnode->phys %p, msg->dst_phys %p\n \ |
| 321 | rnode->size %lld, msg->size %lld, msg->dma_offset %lld\n \ |
| 322 | rx rb head %d tail %d size %d\n", |
| 323 | (char *) rnode->phys, (char *) msg->dst_phys, |
| 324 | rnode->size, msg->size, msg->dma_offset, |
| 325 | rb->head, rb->tail, rb->size); |
| 326 | |
| 327 | /* if message is received in order but with incorrect parameters |
| 328 | (size/dma_offset), drop it, but re-add the rnode at the back of the |
| 329 | rx_skb list, as well as at tx, similar to what is done below for ooo |
| 330 | case. */ |
| 331 | if (rnode->phys == msg->dst_phys) { |
| 332 | list_del(&rnode->list); |
| 333 | list_add_tail(&rnode->list, &vnet_info->vi_rx_skb); |
| 334 | micvnet_msg_send_add_dma_buffer_msg(vnet_info, rnode); |
| 335 | vnet_info->vi_netdev->stats.rx_dropped++; |
| 336 | return 1; |
| 337 | } |
| 338 | |
| 339 | /* Start of OOO message processing. First check if the message has |
| 340 | * really been received OOO. If it is completely unknown to us we just |
| 341 | * drop it and go on. */ |
| 342 | list_for_each(pos, &vnet_info->vi_rx_skb) { |
| 343 | rnode = list_entry(pos, struct rx_node, list); |
| 344 | if (rnode->phys == msg->dst_phys) { |
| 345 | found = true; |
| 346 | break; |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | if (!found) { |
| 351 | vnet_info->vi_netdev->stats.rx_dropped++; |
| 352 | return 1; |
| 353 | } |
| 354 | |
| 355 | vnet_info->vi_netdev->stats.rx_errors++; |
| 356 | |
| 357 | /* Skip all the rnode's till we find the one we are looking for. Rather |
| 358 | * than free rnode skb's and reallocate them, and therby risk allocation |
| 359 | * failures, we simply delete the rnode's from their current position on |
| 360 | * the rnode list and re-add them at back of the list, as well as add |
| 361 | * them back at tx. */ |
| 362 | list_for_each_safe(pos, tmpl, &vnet_info->vi_rx_skb) { |
| 363 | rnode = list_entry(pos, struct rx_node, list); |
| 364 | if (rnode->phys == msg->dst_phys) |
| 365 | break; |
| 366 | |
| 367 | list_del(&rnode->list); |
| 368 | list_add_tail(&rnode->list, &vnet_info->vi_rx_skb); |
| 369 | micvnet_msg_send_add_dma_buffer_msg(vnet_info, rnode); |
| 370 | } |
| 371 | |
| 372 | return 0; |
| 373 | } |
| 374 | |
| 375 | static void |
| 376 | micvnet_msg_recv_dma_complete(struct micvnet_info *vnet_info, |
| 377 | struct micvnet_msg_dma_complete *msg) |
| 378 | { |
| 379 | struct rx_node *rnode; |
| 380 | struct sk_buff *skb; |
| 381 | |
| 382 | vnet_info->vi_netdev->stats.rx_packets++; |
| 383 | |
| 384 | if (micvnet_msg_handle_ooo_msg(vnet_info, msg)) |
| 385 | return; |
| 386 | |
| 387 | rnode = list_entry((&vnet_info->vi_rx_skb)->next, struct rx_node, list); |
| 388 | /* Our OOO message handling guarantees that rnode->phys == msg->dst_phys */ |
| 389 | |
| 390 | vnet_info->vi_netdev->stats.rx_bytes += msg->size; |
| 391 | list_del(&rnode->list); |
| 392 | |
| 393 | spin_lock_bh(&vnet_info->vi_txlock); |
| 394 | if (atomic_read(&vnet_info->vi_state) != MICVNET_STATE_LINKUP) { |
| 395 | spin_unlock_bh(&vnet_info->vi_txlock); |
| 396 | goto skip_adding_new_buffers; |
| 397 | } |
| 398 | atomic_inc(&vnet_info->cnt_tx_pending); |
| 399 | spin_unlock_bh(&vnet_info->vi_txlock); |
| 400 | |
| 401 | /* OOM handling: check if a new SKB can be allocated. If not, we will re-add the |
| 402 | old SKB to TX and not give it to the network stack, i.e. drop it */ |
| 403 | if (micvnet_init_rx_skb_send_msg(vnet_info)) { |
| 404 | list_add_tail(&rnode->list, &vnet_info->vi_rx_skb); |
| 405 | micvnet_msg_send_add_dma_buffer_msg(vnet_info, rnode); |
| 406 | micvnet_dec_cnt_tx_pending(vnet_info); |
| 407 | vnet_info->vi_netdev->stats.rx_dropped++; |
| 408 | return; |
| 409 | } |
| 410 | micvnet_dec_cnt_tx_pending(vnet_info); |
| 411 | |
| 412 | skip_adding_new_buffers: |
| 413 | skb = rnode->skb; |
| 414 | skb_reserve(skb, msg->dma_offset); |
| 415 | skb_put(skb, msg->size); |
| 416 | skb->dev = vnet_info->vi_netdev; |
| 417 | skb->protocol = eth_type_trans(skb, skb->dev); |
| 418 | skb->ip_summed = CHECKSUM_NONE; |
| 419 | |
| 420 | local_bh_disable(); |
| 421 | netif_receive_skb(skb); |
| 422 | local_bh_enable(); |
| 423 | |
| 424 | #ifdef HOST |
| 425 | mic_ctx_unmap_single(vnet_to_ctx(vnet_info), rnode->phys, rnode->size); |
| 426 | #endif |
| 427 | kfree(rnode); |
| 428 | } |
| 429 | |
| 430 | static void |
| 431 | micvnet_msg_send_link_down_msg(struct work_struct *work) |
| 432 | { |
| 433 | struct micvnet_info *vnet_info |
| 434 | = container_of(work, struct micvnet_info, vi_ws_link_down); |
| 435 | struct micvnet_msg msg; |
| 436 | msg.msg_id = MICVNET_MSG_LINK_DOWN; |
| 437 | micvnet_msg_send_msg(vnet_info, &msg); |
| 438 | } |
| 439 | |
| 440 | static void |
| 441 | micvnet_msg_recv_msg_link_down(struct micvnet_info *vnet_info) |
| 442 | { |
| 443 | atomic_set(&vnet_info->vi_state, MICVNET_STATE_BEGIN_UNINIT); |
| 444 | |
| 445 | if (vnet_info->link_down_initiator) |
| 446 | wake_up_interruptible(&vnet_info->stop_waitq); |
| 447 | else |
| 448 | schedule_work(&vnet_info->vi_ws_stop); |
| 449 | } |
| 450 | |
| 451 | static void |
| 452 | micvnet_msg_send_link_up_msg(struct micvnet_info *vnet_info) |
| 453 | { |
| 454 | struct micvnet_msg msg; |
| 455 | struct micvnet_msg_link_up |
| 456 | *body = &msg.body.micvnet_msg_link_up; |
| 457 | |
| 458 | msg.msg_id = MICVNET_MSG_LINK_UP; |
| 459 | body->vnet_driver_version = VNET_DRIVER_VERSION; |
| 460 | micvnet_msg_send_msg(vnet_info, &msg); |
| 461 | } |
| 462 | |
| 463 | static void |
| 464 | micvnet_msg_recv_msg_link_up(struct micvnet_info *vnet_info, |
| 465 | struct micvnet_msg_link_up *msg) |
| 466 | { |
| 467 | if (msg->vnet_driver_version != VNET_DRIVER_VERSION) { |
| 468 | printk(KERN_ERR "%s: Error: vnet driver version mismatch: " |
| 469 | "expected %d actual %lld\n" |
| 470 | "Ensure that host and card modules are " |
| 471 | "from the same build.\n", |
| 472 | __func__, VNET_DRIVER_VERSION, |
| 473 | msg->vnet_driver_version); |
| 474 | return; |
| 475 | } |
| 476 | #ifdef HOST |
| 477 | schedule_work(&vnet_info->vi_ws_start); |
| 478 | #else |
| 479 | micvnet_send_add_dma_buffer_messages(vnet_info); |
| 480 | #endif |
| 481 | } |
| 482 | |
| 483 | static void |
| 484 | micvnet_msg_process_messages(struct micvnet_info *vnet_info) |
| 485 | { |
| 486 | struct micvnet_msg msg; |
| 487 | |
| 488 | #ifdef HOST |
| 489 | micpm_get_reference(vnet_to_ctx(vnet_info), true); |
| 490 | #endif |
| 491 | while (!micvnet_msg_rb_read_msg(vnet_info, &msg)) { |
| 492 | switch(msg.msg_id) { |
| 493 | case MICVNET_MSG_ADD_DMA_BUFFER: |
| 494 | micvnet_msg_recv_add_dma_buffer |
| 495 | (vnet_info, |
| 496 | &msg.body.micvnet_msg_add_dma_buffer); |
| 497 | break; |
| 498 | |
| 499 | case MICVNET_MSG_DMA_COMPLETE: |
| 500 | micvnet_msg_recv_dma_complete |
| 501 | (vnet_info, |
| 502 | &msg.body.micvnet_msg_dma_complete); |
| 503 | break; |
| 504 | |
| 505 | case MICVNET_MSG_LINK_DOWN: |
| 506 | micvnet_msg_recv_msg_link_down(vnet_info); |
| 507 | break; |
| 508 | |
| 509 | case MICVNET_MSG_LINK_UP: |
| 510 | micvnet_msg_recv_msg_link_up(vnet_info, |
| 511 | &msg.body.micvnet_msg_link_up); |
| 512 | break; |
| 513 | |
| 514 | default: |
| 515 | printk(KERN_ERR "BUG: unknown vnet msg id: %lld\n", msg.msg_id); |
| 516 | break; |
| 517 | } |
| 518 | } |
| 519 | #ifdef HOST |
| 520 | micpm_put_reference(vnet_to_ctx(vnet_info)); |
| 521 | #endif |
| 522 | } |
| 523 | |
| 524 | /*********************************************************** |
| 525 | * Interrupts |
| 526 | */ |
| 527 | #ifdef HOST |
| 528 | static int |
| 529 | micvnet_host_doorbell_intr_handler(mic_ctx_t *mic_ctx, int doorbell) |
| 530 | { |
| 531 | struct micvnet_info *vnet_info; |
| 532 | vnet_info = mic_ctx->bi_vethinfo; |
| 533 | |
| 534 | queue_work(vnet_info->vi_wq, &vnet_info->vi_ws_bh); |
| 535 | return 0; |
| 536 | } |
| 537 | #else |
| 538 | static irqreturn_t |
| 539 | micvnet_host_intr_handler(int irq, void *data) |
| 540 | { |
| 541 | struct micvnet_info *vnet_info = data; |
| 542 | queue_work(vnet_info->vi_wq, &vnet_info->vi_ws_bh); |
| 543 | return IRQ_HANDLED; |
| 544 | } |
| 545 | #endif |
| 546 | |
| 547 | static void |
| 548 | micvnet_intr_bh_handler(struct work_struct *work) |
| 549 | { |
| 550 | struct micvnet_info *vnet_info |
| 551 | = container_of(work, struct micvnet_info, vi_ws_bh); |
| 552 | |
| 553 | micvnet_msg_process_messages(vnet_info); |
| 554 | } |
| 555 | |
| 556 | #ifdef HOST |
| 557 | static void |
| 558 | micvnet_send_intr(struct micvnet_info *vnet_info) |
| 559 | { |
| 560 | mic_ctx_t *mic_ctx = vnet_info->mic_ctx; |
| 561 | mic_send_vnet_intr(mic_ctx); |
| 562 | } |
| 563 | #else |
| 564 | /* Ring host doorbell 3 interrupt */ |
| 565 | static void |
| 566 | micvnet_send_intr(struct micvnet_info *vnet_info) |
| 567 | { |
| 568 | uint32_t db_reg; |
| 569 | |
| 570 | /* Ring host doorbell 3 interrupt */ |
| 571 | db_reg = readl(vnet_info->vi_sbox + SBOX_SDBIC3) |
| 572 | | SBOX_SDBIC0_DBREQ_BIT; |
| 573 | writel(db_reg, vnet_info->vi_sbox + SBOX_SDBIC3); |
| 574 | } |
| 575 | #endif |
| 576 | |
| 577 | /*********************************************************** |
| 578 | * Net device ops and rtnl link ops |
| 579 | */ |
| 580 | /* |
| 581 | Do nothing in ndo_open and ndo_stop. There are two reasons for this: |
| 582 | 1. Since host and card side drivers are driver pairs, if ifconfig up or |
| 583 | ifconfig down occurs on one side this needs to be communicated to the other |
| 584 | side other side otherwise in the current implementation this can bring down |
| 585 | the system. Ignoring ifconfig up or down avoids this issue. |
| 586 | 2. For now, micvnet_init is called before the dma can be initialized. However, |
| 587 | as soon as micvnet_init has been called and netdev has been created, the OS |
| 588 | can invoke .ndo_open, which however requires the DMA to have been |
| 589 | initialized. But DMA can not be initialized until later (at present after |
| 590 | the card has booted). |
| 591 | Therefore we ourselves call micvnet_start and micvnet_stop at appropriate |
| 592 | times when we are ready for them. The only consequence is all packets till |
| 593 | micvnet_start has been invoked will be dropped in ndo_start_xmit. |
| 594 | */ |
| 595 | |
| 596 | /* Start callback */ |
| 597 | static int |
| 598 | micvnet_start_dev(struct net_device *dev) |
| 599 | { |
| 600 | struct micvnet_info *vnet_info = dev->ml_priv; |
| 601 | |
| 602 | /* Stop the queue till the state becomes LINKUP. The queue will be started when |
| 603 | dma buffers are added in micvnet_msg_recv_add_dma_buffer(). Not doing this |
| 604 | results in packets getting dropped till state is LINKUP. */ |
| 605 | if (atomic_read(&vnet_info->vi_state) != MICVNET_STATE_LINKUP) |
| 606 | netif_stop_queue(vnet_info->vi_netdev); |
| 607 | |
| 608 | return 0; |
| 609 | } |
| 610 | |
| 611 | /* Stop callback */ |
| 612 | static int |
| 613 | micvnet_stop_dev(struct net_device *dev) |
| 614 | { |
| 615 | return 0; |
| 616 | } |
| 617 | |
| 618 | static void |
| 619 | micvnet_dma_cb_bh(struct work_struct *work) |
| 620 | { |
| 621 | struct micvnet_info |
| 622 | *vnet_info = container_of(work, struct micvnet_info, vi_ws_dmacb); |
| 623 | struct sched_node *snode; |
| 624 | |
| 625 | if (!atomic_read(&vnet_info->cnt_dma_complete)) |
| 626 | return; |
| 627 | |
| 628 | do { |
| 629 | spin_lock_bh(&vnet_info->vi_txlock); |
| 630 | snode = list_entry((&vnet_info->vi_sched_skb)->next, |
| 631 | struct sched_node, list); |
| 632 | list_del(&snode->list); |
| 633 | spin_unlock_bh(&vnet_info->vi_txlock); |
| 634 | |
| 635 | micvnet_msg_send_dma_complete_msg(vnet_info, snode); |
| 636 | |
| 637 | micvnet_dec_cnt_tx_pending(vnet_info); |
| 638 | #ifdef HOST |
| 639 | mic_ctx_unmap_single(vnet_to_ctx(vnet_info), |
| 640 | snode->dma_src_phys, snode->dma_size); |
| 641 | micpm_put_reference(vnet_to_ctx(vnet_info)); |
| 642 | #endif |
| 643 | kfree_skb(snode->skb); |
| 644 | kfree(snode); |
| 645 | |
| 646 | } while (!atomic_dec_and_test(&vnet_info->cnt_dma_complete)); |
| 647 | } |
| 648 | |
| 649 | static void |
| 650 | micvnet_dma_completion_callback(uint64_t data) |
| 651 | { |
| 652 | struct micvnet_info *vnet_info = (struct micvnet_info *) data; |
| 653 | |
| 654 | atomic_inc(&vnet_info->cnt_dma_complete); |
| 655 | |
| 656 | queue_work(vnet_info->vi_wq, &vnet_info->vi_ws_dmacb); |
| 657 | } |
| 658 | |
| 659 | static int |
| 660 | micvnet_do_dma(struct micvnet_info *vnet_info, struct sched_node *snode) |
| 661 | { |
| 662 | uint64_t dma_src, dma_dst; |
| 663 | int ret = 0; |
| 664 | |
| 665 | dma_src = snode->dma_src_phys; |
| 666 | dma_dst = ALIGN(snode->dst_phys, DMA_ALIGNMENT); |
| 667 | snode->dma_offset = (snode->skb->data - snode->skb_data_aligned) |
| 668 | + (dma_dst - snode->dst_phys); |
| 669 | if ((ret = request_dma_channel(vnet_info->dma_chan))) |
| 670 | goto err_exit; |
| 671 | |
| 672 | ret = do_dma(vnet_info->dma_chan, |
| 673 | DO_DMA_INTR, |
| 674 | dma_src, |
| 675 | dma_dst, |
| 676 | snode->dma_size, |
| 677 | &vnet_info->dma_cb); |
| 678 | |
| 679 | free_dma_channel(vnet_info->dma_chan); |
| 680 | |
| 681 | err_exit: |
| 682 | return ret; |
| 683 | } |
| 684 | |
| 685 | static int |
| 686 | micvnet_schedule_dma(struct micvnet_info *vnet_info) |
| 687 | { |
| 688 | struct tx_node *tnode; |
| 689 | struct sched_node *snode; |
| 690 | struct dma_node *dnode; |
| 691 | struct sk_buff *skb; |
| 692 | int ret = 0; |
| 693 | /* tnode */ |
| 694 | spin_lock_bh(&vnet_info->vi_txlock); |
| 695 | BUG_ON(list_empty(&vnet_info->vi_tx_skb)); |
| 696 | tnode = list_entry((&vnet_info->vi_tx_skb)->next, |
| 697 | struct tx_node, list); |
| 698 | list_del(&tnode->list); |
| 699 | spin_unlock_bh(&vnet_info->vi_txlock); |
| 700 | skb = tnode->skb; |
| 701 | kfree(tnode); |
| 702 | |
| 703 | #ifdef HOST |
| 704 | if ((ret = micpm_get_reference(vnet_to_ctx(vnet_info), true))) |
| 705 | goto err_exit_no_dec_node_refcnt; |
| 706 | #endif |
| 707 | |
| 708 | /* dnode */ |
| 709 | spin_lock(&vnet_info->vi_rxlock); |
| 710 | BUG_ON(list_empty(&vnet_info->vi_dma_buf)); |
| 711 | dnode = list_entry((&vnet_info->vi_dma_buf)->next, |
| 712 | struct dma_node, list); |
| 713 | spin_unlock(&vnet_info->vi_rxlock); |
| 714 | if (dnode->size < skb->len + 3 * DMA_ALIGNMENT) { |
| 715 | ret = -ENOMEM; |
| 716 | goto err_exit; |
| 717 | } |
| 718 | |
| 719 | /* snode */ |
| 720 | if (!(snode = kmalloc(sizeof(*snode), GFP_KERNEL))) { |
| 721 | ret = -ENOMEM; |
| 722 | goto err_exit; |
| 723 | } |
| 724 | snode->skb = skb; |
| 725 | snode->dst_phys = dnode->phys; |
| 726 | snode->skb_data_aligned |
| 727 | = (unsigned char *) ((uint64_t) skb->data & ~(DMA_ALIGNMENT - 1)); |
| 728 | snode->dma_size |
| 729 | = ALIGN((skb->len + (skb->data - snode->skb_data_aligned)), |
| 730 | DMA_ALIGNMENT); |
| 731 | #ifdef HOST |
| 732 | snode->dma_src_phys = mic_ctx_map_single(vnet_to_ctx(vnet_info), |
| 733 | snode->skb_data_aligned, |
| 734 | snode->dma_size); |
| 735 | if (mic_map_error(snode->dma_src_phys)) { |
| 736 | kfree(snode); |
| 737 | ret = -ENOMEM; |
| 738 | goto err_exit; |
| 739 | } |
| 740 | #else |
| 741 | snode->dma_src_phys = virt_to_phys(snode->skb_data_aligned); |
| 742 | #endif |
| 743 | |
| 744 | if ((ret = micvnet_do_dma(vnet_info, snode))) { |
| 745 | #ifdef HOST |
| 746 | mic_ctx_unmap_single(vnet_to_ctx(vnet_info), |
| 747 | snode->dma_src_phys, snode->dma_size); |
| 748 | #endif |
| 749 | kfree(snode); |
| 750 | goto err_exit; |
| 751 | } |
| 752 | |
| 753 | /* Update snode/dnode lists only after all operations have successfully |
| 754 | completed and no further errors are possible */ |
| 755 | spin_lock_bh(&vnet_info->vi_txlock); |
| 756 | list_add_tail(&snode->list, &vnet_info->vi_sched_skb); |
| 757 | spin_unlock_bh(&vnet_info->vi_txlock); |
| 758 | |
| 759 | spin_lock(&vnet_info->vi_rxlock); |
| 760 | list_del(&dnode->list); |
| 761 | spin_unlock(&vnet_info->vi_rxlock); |
| 762 | list_obj_free(&vnet_info->dnode_list); |
| 763 | |
| 764 | vnet_info->vi_netdev->stats.tx_packets++; |
| 765 | vnet_info->vi_netdev->stats.tx_bytes += skb->len; |
| 766 | |
| 767 | return ret; |
| 768 | |
| 769 | err_exit: |
| 770 | #ifdef HOST |
| 771 | micpm_put_reference(vnet_to_ctx(vnet_info)); |
| 772 | err_exit_no_dec_node_refcnt: |
| 773 | #endif |
| 774 | micvnet_dec_cnt_tx_pending(vnet_info); |
| 775 | atomic_inc(&vnet_info->cnt_dma_buf_avail); |
| 776 | micvnet_wake_queue(vnet_info); |
| 777 | skb->dev->stats.tx_dropped++; |
| 778 | kfree_skb(skb); |
| 779 | return ret; |
| 780 | } |
| 781 | |
| 782 | static void |
| 783 | micvnet_schedule_dmas(struct work_struct *work) |
| 784 | { |
| 785 | struct micvnet_info *vnet_info |
| 786 | = container_of(work, struct micvnet_info, vi_ws_tx); |
| 787 | volatile bool tx_skb_list_empty; |
| 788 | while (1) { |
| 789 | spin_lock_bh(&vnet_info->vi_txlock); |
| 790 | tx_skb_list_empty = list_empty(&vnet_info->vi_tx_skb); |
| 791 | spin_unlock_bh(&vnet_info->vi_txlock); |
| 792 | if (tx_skb_list_empty) |
| 793 | break; |
| 794 | |
| 795 | micvnet_schedule_dma(vnet_info); |
| 796 | } |
| 797 | } |
| 798 | |
| 799 | int |
| 800 | micvnet_xmit(struct sk_buff *skb, struct net_device *dev) |
| 801 | { |
| 802 | struct micvnet_info *vnet_info = (struct micvnet_info*)dev->ml_priv; |
| 803 | struct tx_node *tnode; |
| 804 | if (!vnet_info || !atomic_read(&vnet_info->cnt_dma_buf_avail)){ |
| 805 | goto err_exit; |
| 806 | } |
| 807 | |
| 808 | if (!(tnode = kmalloc(sizeof(*tnode), GFP_ATOMIC))) |
| 809 | goto err_exit; |
| 810 | tnode->skb = skb; |
| 811 | |
| 812 | spin_lock(&vnet_info->vi_txlock); |
| 813 | if (atomic_read(&vnet_info->vi_state) != MICVNET_STATE_LINKUP) |
| 814 | goto err_exit_unlock; |
| 815 | list_add_tail(&tnode->list, &vnet_info->vi_tx_skb); |
| 816 | atomic_inc(&vnet_info->cnt_tx_pending); |
| 817 | spin_unlock(&vnet_info->vi_txlock); |
| 818 | |
| 819 | queue_work(vnet_info->vi_wq, &vnet_info->vi_ws_tx); |
| 820 | |
| 821 | if (atomic_dec_and_test(&vnet_info->cnt_dma_buf_avail)) |
| 822 | netif_stop_queue(vnet_info->vi_netdev); |
| 823 | |
| 824 | return NETDEV_TX_OK; |
| 825 | |
| 826 | err_exit_unlock: |
| 827 | kfree(tnode); |
| 828 | spin_unlock(&vnet_info->vi_txlock); |
| 829 | err_exit: |
| 830 | kfree_skb(skb); |
| 831 | dev->stats.tx_dropped++; |
| 832 | return NETDEV_TX_OK; |
| 833 | } |
| 834 | |
| 835 | #if LINUX_VERSION_CODE < KERNEL_VERSION(3,2,0) |
| 836 | static void |
| 837 | micvnet_multicast_list(struct net_device *dev) |
| 838 | { |
| 839 | } |
| 840 | #endif |
| 841 | |
| 842 | static int |
| 843 | micvnet_set_address(struct net_device *dev, void *p) |
| 844 | { |
| 845 | struct sockaddr *sa = p; |
| 846 | |
| 847 | if (!is_valid_ether_addr(sa->sa_data)) |
| 848 | return -EADDRNOTAVAIL; |
| 849 | |
| 850 | memcpy(dev->dev_addr, sa->sa_data, ETH_ALEN); |
| 851 | return 0; |
| 852 | } |
| 853 | |
| 854 | #define MIN_MTU 68 |
| 855 | #define MAX_MTU MICVNET_MAX_MTU |
| 856 | |
| 857 | static int |
| 858 | micvnet_change_mtu(struct net_device *dev, int new_mtu) |
| 859 | { |
| 860 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) |
| 861 | return -EINVAL; |
| 862 | dev->mtu = new_mtu; |
| 863 | return 0; |
| 864 | } |
| 865 | |
| 866 | union serial { |
| 867 | uint32_t regs[3]; |
| 868 | char string[13]; |
| 869 | }; |
| 870 | |
| 871 | void |
| 872 | mic_get_serial_from_dbox(struct micvnet_info *vni, char *serialnum) |
| 873 | { |
| 874 | union serial serial; |
| 875 | #ifdef HOST |
| 876 | serial.regs[0] = DBOX_READ(vni->mic_ctx->mmio.va, DBOX_SWF1X0); |
| 877 | serial.regs[1] = DBOX_READ(vni->mic_ctx->mmio.va, DBOX_SWF1X1); |
| 878 | serial.regs[2] = DBOX_READ(vni->mic_ctx->mmio.va, DBOX_SWF1X2); |
| 879 | #else |
| 880 | serial.regs[0] = readl(vni->vi_dbox + DBOX_SWF1X0); |
| 881 | serial.regs[1] = readl(vni->vi_dbox + DBOX_SWF1X1); |
| 882 | serial.regs[2] = readl(vni->vi_dbox + DBOX_SWF1X2); |
| 883 | #endif |
| 884 | serial.string[12] = '\0'; |
| 885 | strcpy(serialnum, serial.string); |
| 886 | } |
| 887 | |
| 888 | int |
| 889 | micvnet_setmac_from_serial(struct net_device *dev) |
| 890 | { |
| 891 | struct micvnet_info *vni = (struct micvnet_info *)dev->ml_priv; |
| 892 | char serialnum[17]; |
| 893 | int err; |
| 894 | |
| 895 | mic_get_serial_from_dbox(vni, serialnum); |
| 896 | #ifdef HOST |
| 897 | err = mic_get_mac_from_serial(serialnum, dev->dev_addr, 1); |
| 898 | #else |
| 899 | err = mic_get_mac_from_serial(serialnum, dev->dev_addr, 0); |
| 900 | #endif |
| 901 | return err; |
| 902 | } |
| 903 | |
| 904 | static const struct net_device_ops micvnet_netdev_ops = { |
| 905 | .ndo_open = micvnet_start_dev, |
| 906 | .ndo_stop = micvnet_stop_dev, |
| 907 | .ndo_start_xmit = micvnet_xmit, |
| 908 | .ndo_validate_addr = eth_validate_addr, |
| 909 | #if LINUX_VERSION_CODE < KERNEL_VERSION(3,2,0) |
| 910 | .ndo_set_multicast_list = micvnet_multicast_list, |
| 911 | #endif |
| 912 | .ndo_set_mac_address = micvnet_set_address, |
| 913 | .ndo_change_mtu = micvnet_change_mtu, |
| 914 | }; |
| 915 | |
| 916 | static void |
| 917 | micvnet_setup(struct net_device *dev) |
| 918 | { |
| 919 | ether_setup(dev); |
| 920 | |
| 921 | /* Initialize the device structure. */ |
| 922 | dev->netdev_ops = &micvnet_netdev_ops; |
| 923 | dev->destructor = free_netdev; |
| 924 | |
| 925 | /* Fill in device structure with ethernet-generic values. */ |
| 926 | dev->mtu = MICVNET_MAX_MTU; |
| 927 | dev->flags &= ~IFF_MULTICAST; |
| 928 | } |
| 929 | |
| 930 | static struct rtnl_link_ops micvnet_link_ops __read_mostly = { |
| 931 | .kind = "micvnet", |
| 932 | .setup = micvnet_setup, |
| 933 | }; |
| 934 | |
| 935 | /*********************************************************** |
| 936 | * Vnet init/deinit |
| 937 | */ |
| 938 | static int |
| 939 | micvnet_init_hw_regs(struct micvnet_info *vnet_info) |
| 940 | { |
| 941 | #ifdef HOST |
| 942 | mic_ctx_t *mic_ctx = vnet_info->mic_ctx; |
| 943 | |
| 944 | vnet_info->vi_pdev = mic_ctx->bi_pdev; |
| 945 | vnet_info->vi_sbox = (uint8_t *)((unsigned long) mic_ctx->mmio.va + |
| 946 | HOST_SBOX_BASE_ADDRESS); |
| 947 | vnet_info->vi_scratch14 |
| 948 | = (uint32_t *)((unsigned long)mic_ctx->mmio.va + |
| 949 | HOST_SBOX_BASE_ADDRESS + SBOX_SCRATCH14); |
| 950 | #else |
| 951 | vnet_info->vi_sbox = ioremap_nocache(SBOX_BASE, SBOX_MMIO_LENGTH); |
| 952 | vnet_info->vi_dbox = ioremap_nocache(DBOX_BASE, SBOX_MMIO_LENGTH); |
| 953 | if (!vnet_info->vi_sbox) { |
| 954 | printk(KERN_ERR "%s: NULL SBOX ptr\n", __func__); |
| 955 | return -ENOMEM; |
| 956 | } |
| 957 | vnet_info->vi_scratch14 |
| 958 | = (uint32_t *)(vnet_info->vi_sbox + SBOX_SCRATCH14); |
| 959 | #endif |
| 960 | return 0; |
| 961 | } |
| 962 | |
| 963 | static void |
| 964 | micvnet_deinit_hw_regs(struct micvnet_info *vnet_info) |
| 965 | { |
| 966 | #ifndef HOST |
| 967 | iounmap(vnet_info->vi_sbox); |
| 968 | iounmap(vnet_info->vi_dbox); |
| 969 | #endif |
| 970 | } |
| 971 | |
| 972 | static int |
| 973 | micvnet_init_interrupts(struct micvnet_info *vnet_info) |
| 974 | { |
| 975 | mic_ctx_t *mic_ctx = vnet_info->mic_ctx; |
| 976 | int ret = 0; |
| 977 | |
| 978 | spin_lock_init(&vnet_info->vi_txlock); |
| 979 | spin_lock_init(&vnet_info->vi_rxlock); |
| 980 | |
| 981 | snprintf(vnet_info->vi_wqname, sizeof(vnet_info->vi_wqname), |
| 982 | "VNET WQ %d", mic_ctx->bi_id); |
| 983 | |
| 984 | if (!(vnet_info->vi_wq = |
| 985 | __mic_create_singlethread_workqueue(vnet_info->vi_wqname))) { |
| 986 | printk(KERN_ERR "%s: create_singlethread_workqueue\n", __func__); |
| 987 | return -ENOMEM; |
| 988 | } |
| 989 | init_waitqueue_head(&vnet_info->stop_waitq); |
| 990 | |
| 991 | INIT_WORK(&vnet_info->vi_ws_bh, micvnet_intr_bh_handler); |
| 992 | INIT_WORK(&vnet_info->vi_ws_tx, micvnet_schedule_dmas); |
| 993 | INIT_WORK(&vnet_info->vi_ws_dmacb, micvnet_dma_cb_bh); |
| 994 | INIT_WORK(&vnet_info->vi_ws_link_down, micvnet_msg_send_link_down_msg); |
| 995 | INIT_WORK(&vnet_info->vi_ws_stop, micvnet_stop_ws); |
| 996 | INIT_WORK(&vnet_info->vi_ws_start, micvnet_start_ws); |
| 997 | #ifdef HOST |
| 998 | if ((ret = mic_reg_irqhandler(mic_ctx, 3, "Host DoorBell 3", |
| 999 | micvnet_host_doorbell_intr_handler))) { |
| 1000 | #else |
| 1001 | if ((ret = request_irq(get_sbox_irq(VNET_SBOX_INT_IDX), |
| 1002 | micvnet_host_intr_handler, IRQF_DISABLED, |
| 1003 | "vnet intr", vnet_info))) { |
| 1004 | #endif |
| 1005 | printk(KERN_ERR "%s: interrupt registration failed\n", __func__); |
| 1006 | goto err_exit_destroy_workqueue; |
| 1007 | } |
| 1008 | return 0; |
| 1009 | |
| 1010 | err_exit_destroy_workqueue: |
| 1011 | destroy_workqueue(vnet_info->vi_wq); |
| 1012 | return ret; |
| 1013 | } |
| 1014 | |
| 1015 | static void |
| 1016 | micvnet_deinit_interrupts(struct micvnet_info *vnet_info) |
| 1017 | { |
| 1018 | #ifdef HOST |
| 1019 | mic_unreg_irqhandler(vnet_info->mic_ctx, 3, "Host DoorBell 3"); |
| 1020 | #else |
| 1021 | free_irq(get_sbox_irq(VNET_SBOX_INT_IDX), vnet_info); |
| 1022 | #endif |
| 1023 | destroy_workqueue(vnet_info->vi_wq); |
| 1024 | } |
| 1025 | |
| 1026 | |
| 1027 | static int |
| 1028 | micvnet_init_netdev(struct micvnet_info *vnet_info) |
| 1029 | { |
| 1030 | struct net_device *dev_vnet; |
| 1031 | int ret = 0; |
| 1032 | |
| 1033 | |
| 1034 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0)) |
| 1035 | if ((dev_vnet = (struct net_device *)alloc_netdev(sizeof(struct micvnet_info), "mic%d", |
| 1036 | NET_NAME_UNKNOWN, micvnet_setup)) == NULL) { |
| 1037 | #else |
| 1038 | if ((dev_vnet = (struct net_device *)alloc_netdev(sizeof(struct micvnet_info), "mic%d", |
| 1039 | micvnet_setup)) == NULL) { |
| 1040 | #endif |
| 1041 | printk(KERN_ERR "%s: alloc_netdev failed\n", __func__); |
| 1042 | return -ENOMEM; |
| 1043 | } |
| 1044 | |
| 1045 | vnet_info->vi_netdev = dev_vnet; |
| 1046 | dev_vnet->ml_priv = vnet_info; |
| 1047 | |
| 1048 | if (micvnet_setmac_from_serial(dev_vnet)) |
| 1049 | random_ether_addr(dev_vnet->dev_addr); |
| 1050 | |
| 1051 | dev_vnet->rtnl_link_ops = &micvnet_link_ops; |
| 1052 | |
| 1053 | if ((ret = register_netdev(dev_vnet)) < 0) { |
| 1054 | printk(KERN_ERR "%s: register_netdev failed %d\n", __func__, ret); |
| 1055 | free_netdev(dev_vnet); |
| 1056 | return ret; |
| 1057 | } |
| 1058 | |
| 1059 | return 0; |
| 1060 | } |
| 1061 | |
| 1062 | static int |
| 1063 | micvnet_init_msg_rings(struct micvnet_info *vnet_info) |
| 1064 | { |
| 1065 | #ifdef HOST |
| 1066 | vnet_info->vi_qp.tx = &vnet_info->vi_rp.rb_tx; |
| 1067 | vnet_info->vi_qp.rx = &vnet_info->vi_rp.rb_rx; |
| 1068 | micvnet_reset_msg_rings(vnet_info); |
| 1069 | |
| 1070 | vnet_info->vi_rp_phys = mic_ctx_map_single(vnet_to_ctx(vnet_info), |
| 1071 | &vnet_info->vi_rp, |
| 1072 | sizeof(vnet_info->vi_rp)); |
| 1073 | if (mic_map_error(vnet_info->vi_rp_phys)) { |
| 1074 | printk(KERN_ERR "%s: mic_map_error failed\n", __func__); |
| 1075 | return -ENOMEM; |
| 1076 | } |
| 1077 | #else |
| 1078 | if (!(vnet_info->vi_rp_phys = vnet_addr)) { |
| 1079 | printk(KERN_ERR "%s: null vnet_addr\n", __func__); |
| 1080 | return -ENOMEM; |
| 1081 | } |
| 1082 | vnet_info->ring_ptr |
| 1083 | = ioremap_nocache(vnet_info->vi_rp_phys, |
| 1084 | sizeof(struct micvnet_msg_ring_pair)); |
| 1085 | if (!vnet_info->ring_ptr) { |
| 1086 | printk(KERN_ERR "%s: NULL ring ptr\n", __func__); |
| 1087 | return -ENOMEM; |
| 1088 | } |
| 1089 | vnet_info->vi_qp.tx = &vnet_info->ring_ptr->rb_rx; |
| 1090 | vnet_info->vi_qp.rx = &vnet_info->ring_ptr->rb_tx; |
| 1091 | #endif |
| 1092 | return 0; |
| 1093 | } |
| 1094 | |
| 1095 | static void |
| 1096 | micvnet_deinit_msg_rings(struct micvnet_info *vnet_info) |
| 1097 | { |
| 1098 | #ifdef HOST |
| 1099 | mic_ctx_unmap_single(vnet_to_ctx(vnet_info), |
| 1100 | vnet_info->vi_rp_phys, sizeof(vnet_info->vi_rp)); |
| 1101 | #else |
| 1102 | iounmap(vnet_info->ring_ptr); |
| 1103 | #endif |
| 1104 | } |
| 1105 | |
| 1106 | static int |
| 1107 | micvnet_init_lists(struct micvnet_info *vnet_info) |
| 1108 | { |
| 1109 | int ret; |
| 1110 | if ((ret = list_obj_list_init(VNET_MAX_SKBS, sizeof(struct dma_node), |
| 1111 | &vnet_info->dnode_list))) |
| 1112 | return ret; |
| 1113 | |
| 1114 | INIT_LIST_HEAD(&vnet_info->vi_rx_skb); |
| 1115 | INIT_LIST_HEAD(&vnet_info->vi_dma_buf); |
| 1116 | INIT_LIST_HEAD(&vnet_info->vi_tx_skb); |
| 1117 | INIT_LIST_HEAD(&vnet_info->vi_sched_skb); |
| 1118 | return 0; |
| 1119 | } |
| 1120 | |
| 1121 | static void |
| 1122 | micvnet_deinit_lists(struct micvnet_info *vnet_info) |
| 1123 | { |
| 1124 | struct list_head *pos, *tmpq; |
| 1125 | struct rx_node *rnode; |
| 1126 | struct tx_node *tnode; |
| 1127 | struct dma_node *dnode; |
| 1128 | struct sched_node *snode; |
| 1129 | |
| 1130 | list_for_each_safe(pos, tmpq, &vnet_info->vi_rx_skb) { |
| 1131 | rnode = list_entry(pos, struct rx_node, list); |
| 1132 | list_del(&rnode->list); |
| 1133 | #ifdef HOST |
| 1134 | mic_ctx_unmap_single(vnet_to_ctx(vnet_info), |
| 1135 | rnode->phys, rnode->size); |
| 1136 | #endif |
| 1137 | kfree_skb(rnode->skb); |
| 1138 | kfree(rnode); |
| 1139 | } |
| 1140 | |
| 1141 | list_for_each_safe(pos, tmpq, &vnet_info->vi_dma_buf) { |
| 1142 | dnode = list_entry(pos, struct dma_node, list); |
| 1143 | list_del(&dnode->list); |
| 1144 | list_obj_free(&vnet_info->dnode_list); |
| 1145 | } |
| 1146 | |
| 1147 | list_for_each_safe(pos, tmpq, &vnet_info->vi_tx_skb) { |
| 1148 | tnode = list_entry(pos, struct tx_node, list); |
| 1149 | list_del(&tnode->list); |
| 1150 | kfree_skb(tnode->skb); |
| 1151 | kfree(tnode); |
| 1152 | } |
| 1153 | |
| 1154 | list_for_each_safe(pos, tmpq, &vnet_info->vi_sched_skb) { |
| 1155 | snode = list_entry(pos, struct sched_node, list); |
| 1156 | list_del(&snode->list); |
| 1157 | #ifdef HOST |
| 1158 | mic_ctx_unmap_single(vnet_to_ctx(vnet_info), snode->dma_src_phys, |
| 1159 | snode->dma_size); |
| 1160 | micpm_put_reference(vnet_to_ctx(vnet_info)); |
| 1161 | #endif |
| 1162 | kfree_skb(snode->skb); |
| 1163 | kfree(snode); |
| 1164 | } |
| 1165 | |
| 1166 | list_obj_list_deinit(&vnet_info->dnode_list); |
| 1167 | } |
| 1168 | static int |
| 1169 | micvnet_init_dma(struct micvnet_info *vnet_info) |
| 1170 | { |
| 1171 | mic_ctx_t *mic_ctx = vnet_info->mic_ctx; |
| 1172 | int ret; |
| 1173 | |
| 1174 | /* Note: open_dma_device must use mic_ctx->dma_handle since that is |
| 1175 | used in the isr */ |
| 1176 | #ifdef HOST |
| 1177 | if (micpm_get_reference(mic_ctx, true) != 0) { |
| 1178 | printk(KERN_ERR "%s: micpm_get_reference failed\n", __func__); |
| 1179 | return -ENODEV; |
| 1180 | } |
| 1181 | |
| 1182 | if ((ret = open_dma_device(mic_ctx->bi_id + 1, |
| 1183 | mic_ctx->mmio.va + HOST_SBOX_BASE_ADDRESS, |
| 1184 | &mic_ctx->dma_handle))) { |
| 1185 | printk(KERN_ERR "%s: open_dma_device failed\n", __func__); |
| 1186 | micpm_put_reference(mic_ctx); |
| 1187 | return ret; |
| 1188 | } |
| 1189 | micpm_put_reference(mic_ctx); |
| 1190 | #else |
| 1191 | if ((ret = open_dma_device(0, 0, &mic_ctx->dma_handle))) { |
| 1192 | printk(KERN_ERR "%s: open_dma_device failed\n", __func__); |
| 1193 | return ret; |
| 1194 | } |
| 1195 | #endif |
| 1196 | |
| 1197 | vnet_info->dma_handle = mic_ctx->dma_handle; |
| 1198 | |
| 1199 | if ((ret = allocate_dma_channel(vnet_info->dma_handle, |
| 1200 | &vnet_info->dma_chan))) { |
| 1201 | printk(KERN_ERR "%s: allocate_dma_channel failed\n", __func__); |
| 1202 | goto err_exit_close_dma; |
| 1203 | } |
| 1204 | free_dma_channel(vnet_info->dma_chan); |
| 1205 | vnet_info->dma_cb.dma_completion_func = micvnet_dma_completion_callback; |
| 1206 | vnet_info->dma_cb.cb_cookie = (uint64_t) vnet_info; |
| 1207 | atomic_set(&vnet_info->cnt_dma_complete, 0); |
| 1208 | atomic_set(&vnet_info->cnt_dma_buf_avail, 0); |
| 1209 | vnet_info->link_down_initiator = false; |
| 1210 | atomic_set(&vnet_info->cnt_tx_pending, 0); |
| 1211 | return 0; |
| 1212 | |
| 1213 | err_exit_close_dma: |
| 1214 | close_dma_device(mic_ctx->bi_id + 1, &vnet_info->dma_handle); |
| 1215 | return ret; |
| 1216 | } |
| 1217 | |
| 1218 | static void |
| 1219 | micvnet_deinit_dma(struct micvnet_info *vnet_info) |
| 1220 | { |
| 1221 | mic_ctx_t *mic_ctx = vnet_info->mic_ctx; |
| 1222 | |
| 1223 | close_dma_device(mic_ctx->bi_id + 1, &vnet_info->dma_handle); |
| 1224 | } |
| 1225 | static int |
| 1226 | micvnet_alloc_rx_node(struct micvnet_info *vnet_info, struct rx_node **node) |
| 1227 | { |
| 1228 | struct rx_node *rnode; |
| 1229 | |
| 1230 | if (!(rnode = kmalloc(sizeof(*rnode), GFP_KERNEL))) |
| 1231 | return -ENOMEM; |
| 1232 | |
| 1233 | rnode->size = vnet_info->vi_netdev->mtu + 3 * DMA_ALIGNMENT + ETH_HLEN; |
| 1234 | |
| 1235 | if (!(rnode->skb = dev_alloc_skb(rnode->size))) { |
| 1236 | kfree(rnode); |
| 1237 | return -ENOMEM; |
| 1238 | } |
| 1239 | |
| 1240 | #ifdef HOST |
| 1241 | rnode->phys = mic_ctx_map_single(vnet_to_ctx(vnet_info), |
| 1242 | rnode->skb->data, rnode->size); |
| 1243 | if (mic_map_error(rnode->phys)) { |
| 1244 | kfree_skb(rnode->skb); |
| 1245 | kfree(rnode); |
| 1246 | return -ENOMEM; |
| 1247 | } |
| 1248 | #else |
| 1249 | rnode->phys = virt_to_phys(rnode->skb->data); |
| 1250 | #endif |
| 1251 | |
| 1252 | *node = rnode; |
| 1253 | |
| 1254 | return 0; |
| 1255 | } |
| 1256 | |
| 1257 | static int |
| 1258 | micvnet_init_rx_skb_send_msg(struct micvnet_info *vnet_info) |
| 1259 | { |
| 1260 | struct rx_node *rnode; |
| 1261 | int ret = 0; |
| 1262 | |
| 1263 | if (unlikely(ret = micvnet_alloc_rx_node(vnet_info, &rnode))) |
| 1264 | return ret; |
| 1265 | |
| 1266 | list_add_tail(&rnode->list, &vnet_info->vi_rx_skb); |
| 1267 | |
| 1268 | micvnet_msg_send_add_dma_buffer_msg(vnet_info, rnode); |
| 1269 | |
| 1270 | return 0; |
| 1271 | } |
| 1272 | |
| 1273 | static int |
| 1274 | micvnet_init_rx_skbs(struct micvnet_info *vnet_info) |
| 1275 | { |
| 1276 | struct rx_node *rnode; |
| 1277 | int i, ret = 0; |
| 1278 | |
| 1279 | |
| 1280 | if ( (vnet_num_buffers <= 0) || (vnet_num_buffers > VNET_MAX_SKBS) ) |
| 1281 | vnet_num_buffers = VNET_MAX_SKBS; |
| 1282 | |
| 1283 | for (i = 0; i < vnet_num_buffers; i++) { |
| 1284 | if (unlikely(ret = micvnet_alloc_rx_node(vnet_info, &rnode))) |
| 1285 | return ret; |
| 1286 | |
| 1287 | list_add_tail(&rnode->list, &vnet_info->vi_rx_skb); |
| 1288 | } |
| 1289 | |
| 1290 | return ret; |
| 1291 | } |
| 1292 | |
| 1293 | static void |
| 1294 | micvnet_send_add_dma_buffer_messages(struct micvnet_info *vnet_info) |
| 1295 | { |
| 1296 | struct rx_node *rnode; |
| 1297 | struct list_head *pos; |
| 1298 | |
| 1299 | list_for_each(pos, &vnet_info->vi_rx_skb) { |
| 1300 | rnode = list_entry(pos, struct rx_node, list); |
| 1301 | micvnet_msg_send_add_dma_buffer_msg(vnet_info, rnode); |
| 1302 | } |
| 1303 | } |
| 1304 | |
| 1305 | static void |
| 1306 | micvnet_initiate_link_down(struct micvnet_info *vnet_info) |
| 1307 | { |
| 1308 | int ret; |
| 1309 | netif_tx_disable(vnet_info->vi_netdev); |
| 1310 | spin_lock_bh(&vnet_info->vi_txlock); |
| 1311 | atomic_set(&vnet_info->vi_state, MICVNET_STATE_LINK_DOWN); |
| 1312 | spin_unlock_bh(&vnet_info->vi_txlock); |
| 1313 | |
| 1314 | /* This wait precludes this function to be called from the context of |
| 1315 | * the vnet wq thread */ |
| 1316 | ret = wait_event_interruptible_timeout( |
| 1317 | vnet_info->stop_waitq, |
| 1318 | (atomic_read(&vnet_info->cnt_tx_pending) == 0), |
| 1319 | STOP_WAIT_TIMEOUT); |
| 1320 | if (!ret) |
| 1321 | printk(KERN_ERR "%s timeout waiting for Tx dma buffers to drain\n", __func__); |
| 1322 | /* To avoid introducing a lock in micvnet_msg_send_msg() send the |
| 1323 | * LINK_DOWN message from vnet wq thread context. LINK_DOWN will be the |
| 1324 | * LAST message sent. */ |
| 1325 | queue_work(vnet_info->vi_wq, &vnet_info->vi_ws_link_down); |
| 1326 | } |
| 1327 | |
| 1328 | static void |
| 1329 | micvnet_stop_deinit(struct micvnet_info *vnet_info) |
| 1330 | { |
| 1331 | flush_workqueue(vnet_info->vi_wq); |
| 1332 | atomic_set(&vnet_info->vi_state, MICVNET_STATE_UNINITIALIZED); |
| 1333 | |
| 1334 | micvnet_deinit_dma(vnet_info); |
| 1335 | micvnet_deinit_lists(vnet_info); |
| 1336 | #ifdef HOST |
| 1337 | micvnet_reset_msg_rings(vnet_info); |
| 1338 | #endif |
| 1339 | atomic_dec(&micvnet.lv_active_clients); |
| 1340 | } |
| 1341 | |
| 1342 | int |
| 1343 | micvnet_probe(mic_ctx_t *mic_ctx) |
| 1344 | { |
| 1345 | struct micvnet_info *vnet_info; |
| 1346 | int ret = 0; |
| 1347 | |
| 1348 | mic_ctx->bi_vethinfo = NULL; |
| 1349 | |
| 1350 | if (!micvnet.created) |
| 1351 | return 1; |
| 1352 | |
| 1353 | if (!(vnet_info = kzalloc(sizeof(struct micvnet_info), GFP_KERNEL))) { |
| 1354 | printk(KERN_ERR "%s: vnet_info alloc failed\n", __func__); |
| 1355 | return -ENOMEM; |
| 1356 | } |
| 1357 | |
| 1358 | mic_ctx->bi_vethinfo = vnet_info; |
| 1359 | vnet_info->mic_ctx = mic_ctx; |
| 1360 | if ((ret = micvnet_init_hw_regs(vnet_info))) |
| 1361 | goto err_exit_free_vnet_info; |
| 1362 | if ((ret = micvnet_init_msg_rings(vnet_info))) |
| 1363 | goto err_exit_deinit_hw_regs; |
| 1364 | if ((ret = micvnet_init_interrupts(vnet_info))) |
| 1365 | goto err_exit_deinit_msg_rings; |
| 1366 | if ((ret = micvnet_init_netdev(vnet_info))) |
| 1367 | goto err_exit_deinit_interrupts; |
| 1368 | |
| 1369 | atomic_set(&vnet_info->vi_state, MICVNET_STATE_UNINITIALIZED); |
| 1370 | return 0; |
| 1371 | |
| 1372 | err_exit_deinit_interrupts: |
| 1373 | micvnet_deinit_interrupts(vnet_info); |
| 1374 | err_exit_deinit_msg_rings: |
| 1375 | micvnet_deinit_msg_rings(vnet_info); |
| 1376 | err_exit_deinit_hw_regs: |
| 1377 | micvnet_deinit_hw_regs(vnet_info); |
| 1378 | err_exit_free_vnet_info: |
| 1379 | kfree(vnet_info); |
| 1380 | |
| 1381 | return ret; |
| 1382 | } |
| 1383 | |
| 1384 | void |
| 1385 | micvnet_remove(mic_ctx_t *mic_ctx) |
| 1386 | { |
| 1387 | struct micvnet_info |
| 1388 | *vnet_info = (struct micvnet_info *) mic_ctx->bi_vethinfo; |
| 1389 | |
| 1390 | if (!vnet_info) |
| 1391 | return; |
| 1392 | |
| 1393 | micvnet_stop(mic_ctx); |
| 1394 | |
| 1395 | vnet_info->vi_netdev->ml_priv = NULL; |
| 1396 | |
| 1397 | micvnet_deinit_interrupts(vnet_info); |
| 1398 | micvnet_deinit_msg_rings(vnet_info); |
| 1399 | micvnet_deinit_hw_regs(vnet_info); |
| 1400 | |
| 1401 | mic_ctx->bi_vethinfo = NULL; |
| 1402 | |
| 1403 | kfree(vnet_info); |
| 1404 | } |
| 1405 | |
| 1406 | int |
| 1407 | micvnet_execute_start(struct micvnet_info *vnet_info) |
| 1408 | { |
| 1409 | int ret = 0; |
| 1410 | |
| 1411 | if (!vnet_info) { |
| 1412 | printk(KERN_ERR "%s: vnet_info is NULL\n", __func__); |
| 1413 | return 1; |
| 1414 | } |
| 1415 | |
| 1416 | if (atomic_cmpxchg(&vnet_info->vi_state, MICVNET_STATE_UNINITIALIZED, |
| 1417 | MICVNET_STATE_TRANSITIONING) != MICVNET_STATE_UNINITIALIZED) { |
| 1418 | printk(KERN_ERR "%s: wrong vnet state %d\n", __func__, |
| 1419 | atomic_read(&vnet_info->vi_state)); |
| 1420 | return 1; |
| 1421 | } |
| 1422 | |
| 1423 | if ((ret = micvnet_init_lists(vnet_info))) |
| 1424 | goto err_exit; |
| 1425 | if ((ret = micvnet_init_dma(vnet_info))) |
| 1426 | goto err_exit_deinit_lists; |
| 1427 | if ((ret = micvnet_init_rx_skbs(vnet_info))) { |
| 1428 | printk(KERN_ERR "%s: micvnet_init_rx_skbs failed\n", __func__); |
| 1429 | goto err_exit_deinit_dma; |
| 1430 | } |
| 1431 | |
| 1432 | memset(&vnet_info->vi_netdev->stats, 0, sizeof(vnet_info->vi_netdev->stats)); |
| 1433 | atomic_inc(&micvnet.lv_active_clients); |
| 1434 | atomic_set(&vnet_info->vi_state, MICVNET_STATE_LINKUP); |
| 1435 | |
| 1436 | micvnet_msg_send_link_up_msg(vnet_info); |
| 1437 | #ifdef HOST |
| 1438 | micvnet_send_add_dma_buffer_messages(vnet_info); |
| 1439 | #else |
| 1440 | writel(MICVNET_CARD_UP_MAGIC, vnet_info->vi_scratch14); |
| 1441 | /* Card adds DMA buffers to host after receiving MICVNET_MSG_LINK_UP */ |
| 1442 | #endif |
| 1443 | return 0; |
| 1444 | |
| 1445 | err_exit_deinit_dma: |
| 1446 | micvnet_deinit_dma(vnet_info); |
| 1447 | err_exit_deinit_lists: |
| 1448 | /* RX SKB's are deallocated in micvnet_deinit_lists() */ |
| 1449 | micvnet_deinit_lists(vnet_info); |
| 1450 | err_exit: |
| 1451 | atomic_set(&vnet_info->vi_state, MICVNET_STATE_UNINITIALIZED); |
| 1452 | return ret; |
| 1453 | } |
| 1454 | |
| 1455 | static void |
| 1456 | micvnet_start_ws(struct work_struct *work) |
| 1457 | { |
| 1458 | struct micvnet_info *vnet_info |
| 1459 | = container_of(work, struct micvnet_info, vi_ws_start); |
| 1460 | |
| 1461 | micvnet_execute_start(vnet_info); |
| 1462 | } |
| 1463 | |
| 1464 | int micvnet_start(mic_ctx_t *mic_ctx) |
| 1465 | { |
| 1466 | #ifndef HOST |
| 1467 | struct micvnet_info *vnet_info = (struct micvnet_info *) mic_ctx->bi_vethinfo; |
| 1468 | micvnet_execute_start(vnet_info); |
| 1469 | #endif |
| 1470 | return 0; |
| 1471 | } |
| 1472 | |
| 1473 | void |
| 1474 | micvnet_execute_stop(struct micvnet_info *vnet_info) |
| 1475 | { |
| 1476 | int ret; |
| 1477 | if (!vnet_info) |
| 1478 | return; |
| 1479 | |
| 1480 | switch(atomic_read(&vnet_info->vi_state)) { |
| 1481 | case MICVNET_STATE_LINKUP: |
| 1482 | case MICVNET_STATE_BEGIN_UNINIT: |
| 1483 | break; |
| 1484 | default: |
| 1485 | return; |
| 1486 | } |
| 1487 | |
| 1488 | #ifdef HOST |
| 1489 | if ((micpm_get_reference(vnet_to_ctx(vnet_info), true)) != 0) |
| 1490 | goto exit; |
| 1491 | #endif |
| 1492 | micvnet_initiate_link_down(vnet_info); |
| 1493 | if (vnet_info->link_down_initiator && !(vnet_info->mic_ctx->state == MIC_SHUTDOWN && vnet_info->mic_ctx->sdbic1)){ |
| 1494 | ret = wait_event_interruptible_timeout( |
| 1495 | vnet_info->stop_waitq, |
| 1496 | (atomic_read(&vnet_info->vi_state) == MICVNET_STATE_BEGIN_UNINIT), |
| 1497 | STOP_WAIT_TIMEOUT); |
| 1498 | if (!ret) |
| 1499 | printk(KERN_ERR "%s: timeout waiting for link down message response\n", __func__); |
| 1500 | } |
| 1501 | |
| 1502 | #ifdef HOST |
| 1503 | micpm_put_reference(vnet_to_ctx(vnet_info)); |
| 1504 | exit: |
| 1505 | #endif |
| 1506 | micvnet_stop_deinit(vnet_info); |
| 1507 | } |
| 1508 | |
| 1509 | void |
| 1510 | micvnet_stop(mic_ctx_t *mic_ctx) |
| 1511 | { |
| 1512 | struct micvnet_info *vnet_info = (struct micvnet_info *) mic_ctx->bi_vethinfo; |
| 1513 | |
| 1514 | vnet_info->link_down_initiator = true; |
| 1515 | micvnet_execute_stop(vnet_info); |
| 1516 | } |
| 1517 | |
| 1518 | static void |
| 1519 | micvnet_stop_ws(struct work_struct *work) |
| 1520 | { |
| 1521 | struct micvnet_info *vnet_info |
| 1522 | = container_of(work, struct micvnet_info, vi_ws_stop); |
| 1523 | |
| 1524 | vnet_info->link_down_initiator = false; |
| 1525 | micvnet_execute_stop(vnet_info); |
| 1526 | } |
| 1527 | |
| 1528 | #if !defined(WINDOWS) && defined(HOST) |
| 1529 | static ssize_t |
| 1530 | show_vnet(struct device *dev, struct device_attribute *attr, char *buf); |
| 1531 | DEVICE_ATTR(vnet, S_IRUGO, show_vnet, NULL); |
| 1532 | |
| 1533 | static ssize_t |
| 1534 | show_vnet(struct device *dev, struct device_attribute *attr, char *buf) |
| 1535 | { |
| 1536 | return snprintf(buf, PAGE_SIZE, "Number of active vnet clients: %d\n", |
| 1537 | atomic_read(&micvnet.lv_active_clients)); |
| 1538 | } |
| 1539 | #endif |
| 1540 | |
| 1541 | int |
| 1542 | micvnet_init(struct device *dev) |
| 1543 | { |
| 1544 | int ret = 0; |
| 1545 | |
| 1546 | micvnet.created = 0; |
| 1547 | atomic_set(&micvnet.lv_active_clients, 0); |
| 1548 | |
| 1549 | if ((ret = rtnl_link_register(&micvnet_link_ops))) { |
| 1550 | printk(KERN_ERR "%s: rtnl_link_register failed\n", __func__); |
| 1551 | return ret; |
| 1552 | } |
| 1553 | |
| 1554 | #ifdef HOST |
| 1555 | if ((ret = device_create_file(dev, &dev_attr_vnet))) { |
| 1556 | printk(KERN_ERR "%s: device_create_file failed\n", __func__); |
| 1557 | rtnl_link_unregister(&micvnet_link_ops); |
| 1558 | return ret; |
| 1559 | } |
| 1560 | #endif |
| 1561 | micvnet.created = 1; |
| 1562 | return 0; |
| 1563 | } |
| 1564 | |
| 1565 | void |
| 1566 | micvnet_exit(void) |
| 1567 | { |
| 1568 | rtnl_link_unregister(&micvnet_link_ops); |
| 1569 | } |
| 1570 | |
| 1571 | #ifndef HOST |
| 1572 | static void __exit |
| 1573 | _micvnet_module_exit(void) |
| 1574 | { |
| 1575 | mic_ctx_t *mic_ctx = &mic_ctx_g; |
| 1576 | |
| 1577 | micvnet_stop(mic_ctx); |
| 1578 | micvnet_remove(mic_ctx); |
| 1579 | micvnet_exit(); |
| 1580 | } |
| 1581 | |
| 1582 | static int |
| 1583 | micvnet_reboot(struct notifier_block *notifier, unsigned long unused1, void *unused2) |
| 1584 | { |
| 1585 | /* Calling _micvnet_module_exit() here will hang the uOS during shutdown in NFS |
| 1586 | * root case */ |
| 1587 | return NOTIFY_OK; |
| 1588 | } |
| 1589 | |
| 1590 | static struct notifier_block micvnet_reboot_notifier = { |
| 1591 | .notifier_call = micvnet_reboot, |
| 1592 | .priority = 0, |
| 1593 | }; |
| 1594 | |
| 1595 | void __exit |
| 1596 | micvnet_module_exit(void) |
| 1597 | { |
| 1598 | unregister_reboot_notifier(&micvnet_reboot_notifier); |
| 1599 | _micvnet_module_exit(); |
| 1600 | } |
| 1601 | |
| 1602 | int __init |
| 1603 | micvnet_module_init(void) |
| 1604 | { |
| 1605 | mic_ctx_t *mic_ctx = &mic_ctx_g; |
| 1606 | int ret = 0; |
| 1607 | |
| 1608 | if ((ret = register_reboot_notifier(&micvnet_reboot_notifier))) { |
| 1609 | printk(KERN_ERR "register_reboot_notifier failed: error %d\n", ret); |
| 1610 | goto err_exit; |
| 1611 | } |
| 1612 | |
| 1613 | memset(mic_ctx, 0, sizeof(*mic_ctx)); |
| 1614 | mic_ctx->bi_id = 0; |
| 1615 | |
| 1616 | if ((ret = micvnet_init(NULL))) |
| 1617 | goto err_exit_unregister_reboot_notifier; |
| 1618 | if ((ret = micvnet_probe(mic_ctx))) |
| 1619 | goto err_exit_micvnet_exit; |
| 1620 | if ((ret = micvnet_start(mic_ctx))) |
| 1621 | goto err_exit_micvnet_remove; |
| 1622 | |
| 1623 | return 0; |
| 1624 | |
| 1625 | err_exit_micvnet_remove: |
| 1626 | micvnet_remove(mic_ctx); |
| 1627 | err_exit_micvnet_exit: |
| 1628 | micvnet_exit(); |
| 1629 | err_exit_unregister_reboot_notifier: |
| 1630 | unregister_reboot_notifier(&micvnet_reboot_notifier); |
| 1631 | err_exit: |
| 1632 | printk(KERN_ERR "%s failed: error %d\n", __func__, ret); |
| 1633 | return ret; |
| 1634 | } |
| 1635 | |
| 1636 | #ifdef STANDALONE_VNET_DMA |
| 1637 | module_init(micvnet_module_init); |
| 1638 | module_exit(micvnet_module_exit); |
| 1639 | #endif |
| 1640 | |
| 1641 | MODULE_LICENSE("GPL"); |
| 1642 | #endif |