1 /************************************************* -*- linux-c -*- 2 * Myricom 10Gb Network Interface Card Software 3 * Copyright 2009, Myricom, Inc. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License, 7 * version 2, 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 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 ****************************************************************/ 18 19 FILE_LICENCE ( GPL2_ONLY ); 20 21 /* 22 * Author: Glenn Brown <glenn (at) myri.com> 23 */ 24 25 /* 26 * General Theory of Operation 27 * 28 * This is a minimal Myricom 10 gigabit Ethernet driver for network 29 * boot. 30 * 31 * Initialization 32 * 33 * myri10ge_pci_probe() is called by gPXE during initialization. 34 * Minimal NIC initialization is performed to minimize resources 35 * consumed when the driver is resident but unused. 36 * 37 * Network Boot 38 * 39 * myri10ge_net_open() is called by gPXE before attempting to network 40 * boot from the card. Packet buffers are allocated and the NIC 41 * interface is initialized. 42 * 43 * Transmit 44 * 45 * myri10ge_net_transmit() enqueues frames for transmission by writing 46 * discriptors to the NIC's tx ring. For simplicity and to avoid 47 * copies, we always have the NIC DMA up the packet. The sent I/O 48 * buffer is released once the NIC signals myri10ge_interrupt_handler() 49 * that the send has completed. 50 * 51 * Receive 52 * 53 * Receives are posted to the NIC's receive ring. The NIC fills a 54 * DMAable receive_completion ring with completion notifications. 55 * myri10ge_net_poll() polls for these receive notifications, posts 56 * replacement receive buffers to the NIC, and passes received frames 57 * to netdev_rx(). 58 */ 59 60 /* 61 * Debugging levels: 62 * - DBG() is for any errors, i.e. failed alloc_iob(), malloc_dma(), 63 * TX overflow, corrupted packets, ... 64 * - DBG2() is for successful events, like packet received, 65 * packet transmitted, and other general notifications. 66 * - DBGP() prints the name of each called function on entry 67 */ 68 69 #include <stdint.h> 70 71 #include <byteswap.h> 72 #include <errno.h> 73 #include <gpxe/ethernet.h> 74 #include <gpxe/if_ether.h> 75 #include <gpxe/iobuf.h> 76 #include <gpxe/malloc.h> 77 #include <gpxe/netdevice.h> 78 #include <gpxe/pci.h> 79 #include <gpxe/timer.h> 80 81 #include "myri10ge_mcp.h" 82 83 /**************************************************************** 84 * Forward declarations 85 ****************************************************************/ 86 87 /* PCI driver entry points */ 88 89 static int myri10ge_pci_probe ( struct pci_device*, 90 const struct pci_device_id* ); 91 static void myri10ge_pci_remove ( struct pci_device* ); 92 93 /* Network device operations */ 94 95 static void myri10ge_net_close ( struct net_device* ); 96 static void myri10ge_net_irq ( struct net_device*, int enable ); 97 static int myri10ge_net_open ( struct net_device* ); 98 static void myri10ge_net_poll ( struct net_device* ); 99 static int myri10ge_net_transmit ( struct net_device*, struct io_buffer* ); 100 101 /**************************************************************** 102 * Constants 103 ****************************************************************/ 104 105 /* Maximum ring indices, used to wrap ring indices. These must be 2**N-1. */ 106 107 #define MYRI10GE_TRANSMIT_WRAP 1U 108 #define MYRI10GE_RECEIVE_WRAP 7U 109 #define MYRI10GE_RECEIVE_COMPLETION_WRAP 31U 110 111 /**************************************************************** 112 * Driver internal data types. 113 ****************************************************************/ 114 115 /* Structure holding all DMA buffers for a NIC, which we will 116 allocated as contiguous read/write DMAable memory when the NIC is 117 initialized. */ 118 119 struct myri10ge_dma_buffers 120 { 121 /* The NIC DMAs receive completion notifications into this ring */ 122 123 mcp_slot_t receive_completion[1+MYRI10GE_RECEIVE_COMPLETION_WRAP]; 124 125 /* Interrupt details are DMAd here before interrupting. */ 126 127 mcp_irq_data_t irq_data; /* 64B */ 128 129 /* NIC command completion status is DMAd here. */ 130 131 mcp_cmd_response_t command_response; /* 8B */ 132 }; 133 134 struct myri10ge_private 135 { 136 /* Interrupt support */ 137 138 uint32 *irq_claim; /* in NIC SRAM */ 139 uint32 *irq_deassert; /* in NIC SRAM */ 140 141 /* DMA buffers. */ 142 143 struct myri10ge_dma_buffers *dma; 144 145 /* 146 * Transmit state. 147 * 148 * The counts here are uint32 for easy comparison with 149 * priv->dma->irq_data.send_done_count and with each other. 150 */ 151 152 mcp_kreq_ether_send_t *transmit_ring; /* in NIC SRAM */ 153 uint32 transmit_ring_wrap; 154 uint32 transmits_posted; 155 uint32 transmits_done; 156 struct io_buffer *transmit_iob[1 + MYRI10GE_TRANSMIT_WRAP]; 157 158 /* 159 * Receive state. 160 */ 161 162 mcp_kreq_ether_recv_t *receive_post_ring; /* in NIC SRAM */ 163 unsigned int receive_post_ring_wrap; 164 unsigned int receives_posted; 165 unsigned int receives_done; 166 struct io_buffer *receive_iob[1 + MYRI10GE_RECEIVE_WRAP]; 167 168 /* Address for writing commands to the firmware. 169 BEWARE: the value must be written 32 bits at a time. */ 170 171 mcp_cmd_t *command; 172 }; 173 174 /**************************************************************** 175 * Driver internal functions. 176 ****************************************************************/ 177 178 /* Print ring status when debugging. Use this only after a printed 179 value changes. */ 180 181 #define DBG2_RINGS( priv ) \ 182 DBG2 ( "tx %x/%x rx %x/%x in %s() \n", \ 183 ( priv ) ->transmits_done, ( priv ) -> transmits_posted, \ 184 ( priv ) ->receives_done, ( priv ) -> receives_posted, \ 185 __FUNCTION__ ) 186 187 /* 188 * Return a pointer to the driver private data for a network device. 189 * 190 * @v netdev Network device created by this driver. 191 * @ret priv The corresponding driver private data. 192 */ 193 static inline struct myri10ge_private *myri10ge_priv ( struct net_device *nd ) 194 { 195 /* Our private data always follows the network device in memory, 196 since we use alloc_netdev() to allocate the storage. */ 197 198 return ( struct myri10ge_private * ) ( nd + 1 ); 199 } 200 201 /* 202 * Pass a receive buffer to the NIC to be filled. 203 * 204 * @v priv The network device to receive the buffer. 205 * @v iob The I/O buffer to fill. 206 * 207 * Receive buffers are filled in FIFO order. 208 */ 209 static void myri10ge_post_receive ( struct myri10ge_private *priv, 210 struct io_buffer *iob ) 211 { 212 unsigned int receives_posted; 213 mcp_kreq_ether_recv_t *request; 214 215 /* Record the posted I/O buffer, to be passed to netdev_rx() on 216 receive. */ 217 218 receives_posted = priv->receives_posted; 219 priv->receive_iob[receives_posted & MYRI10GE_RECEIVE_WRAP] = iob; 220 221 /* Post the receive. */ 222 223 request = &priv->receive_post_ring[receives_posted 224 & priv->receive_post_ring_wrap]; 225 request->addr_high = 0; 226 wmb(); 227 request->addr_low = htonl ( virt_to_bus ( iob->data ) ); 228 priv->receives_posted = ++receives_posted; 229 } 230 231 /* 232 * Execute a command on the NIC. 233 * 234 * @v priv NIC to perform the command. 235 * @v cmd The command to perform. 236 * @v data I/O copy buffer for parameters/results 237 * @ret rc 0 on success, else an error code. 238 */ 239 static int myri10ge_command ( struct myri10ge_private *priv, 240 uint32 cmd, 241 uint32 data[3] ) 242 { 243 int i; 244 mcp_cmd_t *command; 245 uint32 result; 246 unsigned int slept_ms; 247 volatile mcp_cmd_response_t *response; 248 249 DBGP ( "myri10ge_command ( ,%d, ) \n", cmd ); 250 command = priv->command; 251 response = &priv->dma->command_response; 252 253 /* Mark the command as incomplete. */ 254 255 response->result = 0xFFFFFFFF; 256 257 /* Pass the command to the NIC. */ 258 259 command->cmd = htonl ( cmd ); 260 command->data0 = htonl ( data[0] ); 261 command->data1 = htonl ( data[1] ); 262 command->data2 = htonl ( data[2] ); 263 command->response_addr.high = 0; 264 command->response_addr.low 265 = htonl ( virt_to_bus ( &priv->dma->command_response ) ); 266 for ( i=0; i<36; i+=4 ) 267 * ( uint32 * ) &command->pad[i] = 0; 268 wmb(); 269 * ( uint32 * ) &command->pad[36] = 0; 270 271 /* Wait up to 2 seconds for a response. */ 272 273 for ( slept_ms=0; slept_ms<2000; slept_ms++ ) { 274 result = response->result; 275 if ( result == 0 ) { 276 data[0] = ntohl ( response->data ); 277 return 0; 278 } else if ( result != 0xFFFFFFFF ) { 279 DBG ( "cmd%d:0x%x\n", 280 cmd, 281 ntohl ( response->result ) ); 282 return -EIO; 283 } 284 udelay ( 1000 ); 285 rmb(); 286 } 287 DBG ( "cmd%d:timed out\n", cmd ); 288 return -ETIMEDOUT; 289 } 290 291 /* 292 * Handle any pending interrupt. 293 * 294 * @v netdev Device being polled for interrupts. 295 * 296 * This is called periodically to let the driver check for interrupts. 297 */ 298 static void myri10ge_interrupt_handler ( struct net_device *netdev ) 299 { 300 struct myri10ge_private *priv; 301 mcp_irq_data_t *irq_data; 302 uint8 valid; 303 304 priv = myri10ge_priv ( netdev ); 305 irq_data = &priv->dma->irq_data; 306 307 /* Return if there was no interrupt. */ 308 309 rmb(); 310 valid = irq_data->valid; 311 if ( !valid ) 312 return; 313 DBG2 ( "irq " ); 314 315 /* Tell the NIC to deassert the interrupt and clear 316 irq_data->valid.*/ 317 318 *priv->irq_deassert = 0; /* any value is OK. */ 319 mb(); 320 321 /* Handle any new receives. */ 322 323 if ( valid & 1 ) { 324 325 /* Pass the receive interrupt token back to the NIC. */ 326 327 DBG2 ( "rx " ); 328 *priv->irq_claim = htonl ( 3 ); 329 wmb(); 330 } 331 332 /* Handle any sent packet by freeing its I/O buffer, now that 333 we know it has been DMAd. */ 334 335 if ( valid & 2 ) { 336 unsigned int nic_done_count; 337 338 DBG2 ( "snt " ); 339 nic_done_count = ntohl ( priv->dma->irq_data.send_done_count ); 340 while ( priv->transmits_done != nic_done_count ) { 341 struct io_buffer *iob; 342 343 iob = priv->transmit_iob [priv->transmits_done 344 & MYRI10GE_TRANSMIT_WRAP]; 345 DBG2 ( "%p ", iob ); 346 netdev_tx_complete ( netdev, iob ); 347 ++priv->transmits_done; 348 } 349 } 350 351 /* Record any statistics update. */ 352 353 if ( irq_data->stats_updated ) { 354 355 /* Update the link status. */ 356 357 DBG2 ( "stats " ); 358 if ( ntohl ( irq_data->link_up ) == MXGEFW_LINK_UP ) 359 netdev_link_up ( netdev ); 360 else 361 netdev_link_down ( netdev ); 362 363 /* Ignore all error counters from the NIC. */ 364 } 365 366 /* Wait for the interrupt to be deasserted, as indicated by 367 irq_data->valid, which is set by the NIC after the deassert. */ 368 369 DBG2 ( "wait " ); 370 do { 371 mb(); 372 } while ( irq_data->valid ); 373 374 /* Claim the interrupt to enable future interrupt generation. */ 375 376 DBG2 ( "claim\n" ); 377 * ( priv->irq_claim + 1 ) = htonl ( 3 ); 378 mb(); 379 } 380 381 /* Constants for reading the STRING_SPECS via the Myricom 382 Vendor Specific PCI configuration space capability. */ 383 384 #define VS_ADDR ( vs + 0x18 ) 385 #define VS_DATA ( vs + 0x14 ) 386 #define VS_MODE ( vs + 0x10 ) 387 #define VS_MODE_READ32 0x3 388 #define VS_MODE_LOCATE 0x8 389 #define VS_LOCATE_STRING_SPECS 0x3 390 391 /* 392 * Read MAC address from its 'string specs' via the vendor-specific 393 * capability. (This capability allows NIC SRAM and ROM to be read 394 * before it is mapped.) 395 * 396 * @v pci The device. 397 * @v mac Buffer to store the MAC address. 398 * @ret rc Returns 0 on success, else an error code. 399 */ 400 static int mac_address_from_string_specs ( struct pci_device *pci, 401 uint8 mac[ETH_ALEN] ) 402 { 403 char string_specs[256]; 404 char *ptr, *limit; 405 char *to = string_specs; 406 uint32 addr; 407 uint32 len; 408 unsigned int vs; 409 int mac_set = 0; 410 411 /* Find the "vendor specific" capability. */ 412 413 vs = pci_find_capability ( pci, 9 ); 414 if ( vs == 0 ) { 415 DBG ( "no VS\n" ); 416 return -ENOTSUP; 417 } 418 419 /* Locate the String specs in LANai SRAM. */ 420 421 pci_write_config_byte ( pci, VS_MODE, VS_MODE_LOCATE ); 422 pci_write_config_dword ( pci, VS_ADDR, VS_LOCATE_STRING_SPECS ); 423 pci_read_config_dword ( pci, VS_ADDR, &addr ); 424 pci_read_config_dword ( pci, VS_DATA, &len ); 425 DBG2 ( "ss@%x,%x\n", addr, len ); 426 427 /* Copy in the string specs. Use 32-bit reads for performance. */ 428 429 if ( len > sizeof ( string_specs ) || ( len & 3 ) ) { 430 DBG ( "SS too big\n" ); 431 return -ENOTSUP; 432 } 433 434 pci_write_config_byte ( pci, VS_MODE, VS_MODE_READ32 ); 435 while ( len >= 4 ) { 436 uint32 tmp; 437 438 pci_write_config_byte ( pci, VS_ADDR, addr ); 439 pci_read_config_dword ( pci, VS_DATA, &tmp ); 440 tmp = ntohl ( tmp ); 441 memcpy ( to, &tmp, 4 ); 442 to += 4; 443 addr += 4; 444 len -= 4; 445 } 446 pci_write_config_byte ( pci, VS_MODE, 0 ); 447 448 /* Parse the string specs. */ 449 450 DBG2 ( "STRING_SPECS:\n" ); 451 ptr = string_specs; 452 limit = string_specs + sizeof ( string_specs ); 453 while ( *ptr != '\0' && ptr < limit ) { 454 DBG2 ( "%s\n", ptr ); 455 if ( memcmp ( ptr, "MAC=", 4 ) == 0 ) { 456 unsigned int i; 457 458 ptr += 4; 459 for ( i=0; i<6; i++ ) { 460 if ( ( ptr + 2 ) > limit ) { 461 DBG ( "bad MAC addr\n" ); 462 return -ENOTSUP; 463 } 464 mac[i] = strtoul ( ptr, &ptr, 16 ); 465 ptr += 1; 466 } 467 mac_set = 1; 468 } 469 else 470 while ( ptr < limit && *ptr++ ); 471 } 472 473 /* Verify we parsed all we need. */ 474 475 if ( !mac_set ) { 476 DBG ( "no MAC addr\n" ); 477 return -ENOTSUP; 478 } 479 480 DBG2 ( "MAC %02x:%02x:%02x:%02x:%02x:%02x\n", 481 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5] ); 482 483 return 0; 484 } 485 486 /**************************************************************** 487 * gPXE PCI Device Driver API functions 488 ****************************************************************/ 489 490 /* 491 * Initialize the PCI device. 492 * 493 * @v pci The device's associated pci_device structure. 494 * @v id The PCI device + vendor id. 495 * @ret rc Returns zero if successfully initialized. 496 * 497 * This function is called very early on, while gPXE is initializing. 498 * This is a gPXE PCI Device Driver API function. 499 */ 500 static int myri10ge_pci_probe ( struct pci_device *pci, 501 const struct pci_device_id *id __unused ) 502 { 503 static struct net_device_operations myri10ge_operations = { 504 .open = myri10ge_net_open, 505 .close = myri10ge_net_close, 506 .transmit = myri10ge_net_transmit, 507 .poll = myri10ge_net_poll, 508 .irq = myri10ge_net_irq 509 }; 510 511 const char *dbg; 512 int rc; 513 struct net_device *netdev; 514 struct myri10ge_private *priv; 515 516 DBGP ( "myri10ge_pci_probe: " ); 517 518 netdev = alloc_etherdev ( sizeof ( *priv ) ); 519 if ( !netdev ) { 520 rc = -ENOMEM; 521 dbg = "alloc_etherdev"; 522 goto abort_with_nothing; 523 } 524 525 netdev_init ( netdev, &myri10ge_operations ); 526 priv = myri10ge_priv ( netdev ); 527 528 pci_set_drvdata ( pci, netdev ); 529 netdev->dev = &pci->dev; 530 531 /* Make sure interrupts are disabled. */ 532 533 myri10ge_net_irq ( netdev, 0 ); 534 535 /* Read the NIC HW address. */ 536 537 rc = mac_address_from_string_specs ( pci, netdev->hw_addr ); 538 if ( rc ) { 539 dbg = "mac_from_ss"; 540 goto abort_with_netdev_init; 541 } 542 DBGP ( "mac " ); 543 544 /* Enable bus master, etc. */ 545 546 adjust_pci_device ( pci ); 547 DBGP ( "pci " ); 548 549 /* Register the initialized network device. */ 550 551 rc = register_netdev ( netdev ); 552 if ( rc ) { 553 dbg = "register_netdev"; 554 goto abort_with_netdev_init; 555 } 556 557 DBGP ( "done\n" ); 558 559 return 0; 560 561 abort_with_netdev_init: 562 netdev_nullify ( netdev ); 563 netdev_put ( netdev ); 564 abort_with_nothing: 565 DBG ( "%s:%s\n", dbg, strerror ( rc ) ); 566 return rc; 567 } 568 569 /* 570 * Remove a device from the PCI device list. 571 * 572 * @v pci PCI device to remove. 573 * 574 * This is a PCI Device Driver API function. 575 */ 576 static void myri10ge_pci_remove ( struct pci_device *pci ) 577 { 578 struct net_device *netdev; 579 580 DBGP ( "myri10ge_pci_remove\n" ); 581 netdev = pci_get_drvdata ( pci ); 582 583 unregister_netdev ( netdev ); 584 netdev_nullify ( netdev ); 585 netdev_put ( netdev ); 586 } 587 588 /**************************************************************** 589 * gPXE Network Device Driver Operations 590 ****************************************************************/ 591 592 /* 593 * Close a network device. 594 * 595 * @v netdev Device to close. 596 * 597 * This is a gPXE Network Device Driver API function. 598 */ 599 static void myri10ge_net_close ( struct net_device *netdev ) 600 { 601 struct myri10ge_private *priv; 602 uint32 data[3]; 603 604 DBGP ( "myri10ge_net_close\n" ); 605 priv = myri10ge_priv ( netdev ); 606 607 /* disable interrupts */ 608 609 myri10ge_net_irq ( netdev, 0 ); 610 611 /* Reset the NIC interface, so we won't get any more events from 612 the NIC. */ 613 614 myri10ge_command ( priv, MXGEFW_CMD_RESET, data ); 615 616 /* Free receive buffers that were never filled. */ 617 618 while ( priv->receives_done != priv->receives_posted ) { 619 free_iob ( priv->receive_iob[priv->receives_done 620 & MYRI10GE_RECEIVE_WRAP] ); 621 ++priv->receives_done; 622 } 623 624 /* Release DMAable memory. */ 625 626 free_dma ( priv->dma, sizeof ( *priv->dma ) ); 627 628 /* Erase all state from the open. */ 629 630 memset ( priv, 0, sizeof ( *priv ) ); 631 632 DBG2_RINGS ( priv ); 633 } 634 635 /* 636 * Enable or disable IRQ masking. 637 * 638 * @v netdev Device to control. 639 * @v enable Zero to mask off IRQ, non-zero to enable IRQ. 640 * 641 * This is a gPXE Network Driver API function. 642 */ 643 static void myri10ge_net_irq ( struct net_device *netdev, int enable ) 644 { 645 struct pci_device *pci_dev; 646 uint16 val; 647 648 DBGP ( "myri10ge_net_irq\n" ); 649 pci_dev = ( struct pci_device * ) netdev->dev; 650 651 /* Adjust the Interrupt Disable bit in the Command register of the 652 PCI Device. */ 653 654 pci_read_config_word ( pci_dev, PCI_COMMAND, &val ); 655 if ( enable ) 656 val &= ~PCI_COMMAND_INTX_DISABLE; 657 else 658 val |= PCI_COMMAND_INTX_DISABLE; 659 pci_write_config_word ( pci_dev, PCI_COMMAND, val ); 660 } 661 662 /* 663 * Opens a network device. 664 * 665 * @v netdev Device to be opened. 666 * @ret rc Non-zero if failed to open. 667 * 668 * This enables tx and rx on the device. 669 * This is a gPXE Network Device Driver API function. 670 */ 671 static int myri10ge_net_open ( struct net_device *netdev ) 672 { 673 const char *dbg; /* printed upon error return */ 674 int rc; 675 struct io_buffer *iob; 676 struct myri10ge_private *priv; 677 uint32 data[3]; 678 struct pci_device *pci_dev; 679 void *membase; 680 681 DBGP ( "myri10ge_net_open\n" ); 682 priv = myri10ge_priv ( netdev ); 683 pci_dev = ( struct pci_device * ) netdev->dev; 684 membase = phys_to_virt ( pci_dev->membase ); 685 686 /* Compute address for passing commands to the firmware. */ 687 688 priv->command = membase + MXGEFW_ETH_CMD; 689 690 /* Ensure interrupts are disabled. */ 691 692 myri10ge_net_irq ( netdev, 0 ); 693 694 /* Allocate cleared DMAable buffers. */ 695 696 priv->dma = malloc_dma ( sizeof ( *priv->dma ) , 128 ); 697 if ( !priv->dma ) { 698 rc = -ENOMEM; 699 dbg = "DMA"; 700 goto abort_with_nothing; 701 } 702 memset ( priv->dma, 0, sizeof ( *priv->dma ) ); 703 704 /* Simplify following code. */ 705 706 #define TRY( prefix, base, suffix ) do { \ 707 rc = myri10ge_command ( priv, \ 708 MXGEFW_ \ 709 ## prefix \ 710 ## base \ 711 ## suffix, \ 712 data ); \ 713 if ( rc ) { \ 714 dbg = #base; \ 715 goto abort_with_dma; \ 716 } \ 717 } while ( 0 ) 718 719 /* Send a reset command to the card to see if it is alive, 720 and to reset its queue state. */ 721 722 TRY ( CMD_, RESET , ); 723 724 /* Set the interrupt queue size. */ 725 726 data[0] = ( sizeof ( priv->dma->receive_completion ) 727 | MXGEFW_CMD_SET_INTRQ_SIZE_FLAG_NO_STRICT_SIZE_CHECK ); 728 TRY ( CMD_SET_ , INTRQ_SIZE , ); 729 730 /* Set the interrupt queue DMA address. */ 731 732 data[0] = virt_to_bus ( &priv->dma->receive_completion ); 733 data[1] = 0; 734 TRY ( CMD_SET_, INTRQ_DMA, ); 735 736 /* Get the NIC interrupt claim address. */ 737 738 TRY ( CMD_GET_, IRQ_ACK, _OFFSET ); 739 priv->irq_claim = membase + data[0]; 740 741 /* Get the NIC interrupt assert address. */ 742 743 TRY ( CMD_GET_, IRQ_DEASSERT, _OFFSET ); 744 priv->irq_deassert = membase + data[0]; 745 746 /* Disable interrupt coalescing, which is inappropriate for the 747 minimal buffering we provide. */ 748 749 TRY ( CMD_GET_, INTR_COAL, _DELAY_OFFSET ); 750 * ( ( uint32 * ) ( membase + data[0] ) ) = 0; 751 752 /* Set the NIC mac address. */ 753 754 data[0] = ( netdev->ll_addr[0] << 24 755 | netdev->ll_addr[1] << 16 756 | netdev->ll_addr[2] << 8 757 | netdev->ll_addr[3] ); 758 data[1] = ( ( netdev->ll_addr[4] << 8 ) 759 | netdev->ll_addr[5] ); 760 TRY ( SET_ , MAC_ADDRESS , ); 761 762 /* Enable multicast receives, because some gPXE clients don't work 763 without multicast. . */ 764 765 TRY ( ENABLE_ , ALLMULTI , ); 766 767 /* Disable Ethernet flow control, so the NIC cannot deadlock the 768 network under any circumstances. */ 769 770 TRY ( DISABLE_ , FLOW , _CONTROL ); 771 772 /* Compute transmit ring sizes. */ 773 774 data[0] = 0; /* slice 0 */ 775 TRY ( CMD_GET_, SEND_RING, _SIZE ); 776 priv->transmit_ring_wrap 777 = data[0] / sizeof ( mcp_kreq_ether_send_t ) - 1; 778 if ( priv->transmit_ring_wrap 779 & ( priv->transmit_ring_wrap + 1 ) ) { 780 rc = -EPROTO; 781 dbg = "TX_RING"; 782 goto abort_with_dma; 783 } 784 785 /* Compute receive ring sizes. */ 786 787 data[0] = 0; /* slice 0 */ 788 TRY ( CMD_GET_ , RX_RING , _SIZE ); 789 priv->receive_post_ring_wrap = data[0] / sizeof ( mcp_dma_addr_t ) - 1; 790 if ( priv->receive_post_ring_wrap 791 & ( priv->receive_post_ring_wrap + 1 ) ) { 792 rc = -EPROTO; 793 dbg = "RX_RING"; 794 goto abort_with_dma; 795 } 796 797 /* Get NIC transmit ring address. */ 798 799 data[0] = 0; /* slice 0. */ 800 TRY ( CMD_GET_, SEND, _OFFSET ); 801 priv->transmit_ring = membase + data[0]; 802 803 /* Get the NIC receive ring address. */ 804 805 data[0] = 0; /* slice 0. */ 806 TRY ( CMD_GET_, SMALL_RX, _OFFSET ); 807 priv->receive_post_ring = membase + data[0]; 808 809 /* Set the Nic MTU. */ 810 811 data[0] = ETH_FRAME_LEN; 812 TRY ( CMD_SET_, MTU, ); 813 814 /* Tell the NIC our buffer sizes. ( We use only small buffers, so we 815 set both buffer sizes to the same value, which will force all 816 received frames to use small buffers. ) */ 817 818 data[0] = MXGEFW_PAD + ETH_FRAME_LEN; 819 TRY ( CMD_SET_, SMALL_BUFFER, _SIZE ); 820 data[0] = MXGEFW_PAD + ETH_FRAME_LEN; 821 TRY ( CMD_SET_, BIG_BUFFER, _SIZE ); 822 823 /* Tell firmware where to DMA IRQ data */ 824 825 data[0] = virt_to_bus ( &priv->dma->irq_data ); 826 data[1] = 0; 827 data[2] = sizeof ( priv->dma->irq_data ); 828 TRY ( CMD_SET_, STATS_DMA_V2, ); 829 830 /* Post receives. */ 831 832 while ( priv->receives_posted <= MYRI10GE_RECEIVE_WRAP ) { 833 834 /* Reserve 2 extra bytes at the start of packets, since 835 the firmware always skips the first 2 bytes of the buffer 836 so TCP headers will be aligned. */ 837 838 iob = alloc_iob ( MXGEFW_PAD + ETH_FRAME_LEN ); 839 if ( !iob ) { 840 rc = -ENOMEM; 841 dbg = "alloc_iob"; 842 goto abort_with_receives_posted; 843 } 844 iob_reserve ( iob, MXGEFW_PAD ); 845 myri10ge_post_receive ( priv, iob ); 846 } 847 848 /* Bring up the link. */ 849 850 TRY ( CMD_, ETHERNET_UP, ); 851 852 DBG2_RINGS ( priv ); 853 return 0; 854 855 abort_with_receives_posted: 856 while ( priv->receives_posted-- ) 857 free_iob ( priv->receive_iob[priv->receives_posted] ); 858 abort_with_dma: 859 /* Because the link is not up, we don't have to reset the NIC here. */ 860 free_dma ( priv->dma, sizeof ( *priv->dma ) ); 861 abort_with_nothing: 862 /* Erase all signs of the failed open. */ 863 memset ( priv, 0, sizeof ( *priv ) ); 864 DBG ( "%s: %s\n", dbg, strerror ( rc ) ); 865 return ( rc ); 866 } 867 868 /* 869 * This function allows a driver to process events during operation. 870 * 871 * @v netdev Device being polled. 872 * 873 * This is called periodically by gPXE to let the driver check the status of 874 * transmitted packets and to allow the driver to check for received packets. 875 * This is a gPXE Network Device Driver API function. 876 */ 877 static void myri10ge_net_poll ( struct net_device *netdev ) 878 { 879 struct io_buffer *iob; 880 struct io_buffer *replacement; 881 struct myri10ge_dma_buffers *dma; 882 struct myri10ge_private *priv; 883 unsigned int length; 884 unsigned int orig_receives_posted; 885 886 DBGP ( "myri10ge_net_poll\n" ); 887 priv = myri10ge_priv ( netdev ); 888 dma = priv->dma; 889 890 /* Process any pending interrupt. */ 891 892 myri10ge_interrupt_handler ( netdev ); 893 894 /* Pass up received frames, but limit ourselves to receives posted 895 before this function was called, so we cannot livelock if 896 receives are arriving faster than we process them. */ 897 898 orig_receives_posted = priv->receives_posted; 899 while ( priv->receives_done != orig_receives_posted ) { 900 901 /* Stop if there is no pending receive. */ 902 903 length = ntohs ( dma->receive_completion 904 [priv->receives_done 905 & MYRI10GE_RECEIVE_COMPLETION_WRAP] 906 .length ); 907 if ( length == 0 ) 908 break; 909 910 /* Allocate a replacement buffer. If none is available, 911 stop passing up packets until a buffer is available. 912 913 Reserve 2 extra bytes at the start of packets, since 914 the firmware always skips the first 2 bytes of the buffer 915 so TCP headers will be aligned. */ 916 917 replacement = alloc_iob ( MXGEFW_PAD + ETH_FRAME_LEN ); 918 if ( !replacement ) { 919 DBG ( "NO RX BUF\n" ); 920 break; 921 } 922 iob_reserve ( replacement, MXGEFW_PAD ); 923 924 /* Pass up the received frame. */ 925 926 iob = priv->receive_iob[priv->receives_done 927 & MYRI10GE_RECEIVE_WRAP]; 928 iob_put ( iob, length ); 929 netdev_rx ( netdev, iob ); 930 931 /* We have consumed the packet, so clear the receive 932 notification. */ 933 934 dma->receive_completion [priv->receives_done 935 & MYRI10GE_RECEIVE_COMPLETION_WRAP] 936 .length = 0; 937 wmb(); 938 939 /* Replace the passed-up I/O buffer. */ 940 941 myri10ge_post_receive ( priv, replacement ); 942 ++priv->receives_done; 943 DBG2_RINGS ( priv ); 944 } 945 } 946 947 /* 948 * This transmits a packet. 949 * 950 * @v netdev Device to transmit from. 951 * @v iobuf Data to transmit. 952 * @ret rc Non-zero if failed to transmit. 953 * 954 * This is a gPXE Network Driver API function. 955 */ 956 static int myri10ge_net_transmit ( struct net_device *netdev, 957 struct io_buffer *iobuf ) 958 { 959 mcp_kreq_ether_send_t *kreq; 960 size_t len; 961 struct myri10ge_private *priv; 962 uint32 transmits_posted; 963 964 DBGP ( "myri10ge_net_transmit\n" ); 965 priv = myri10ge_priv ( netdev ); 966 967 /* Confirm space in the send ring. */ 968 969 transmits_posted = priv->transmits_posted; 970 if ( transmits_posted - priv->transmits_done 971 > MYRI10GE_TRANSMIT_WRAP ) { 972 DBG ( "TX ring full\n" ); 973 return -ENOBUFS; 974 } 975 976 DBG2 ( "TX %p+%d ", iobuf->data, iob_len ( iobuf ) ); 977 DBG2_HD ( iobuf->data, 14 ); 978 979 /* Record the packet being transmitted, so we can later report 980 send completion. */ 981 982 priv->transmit_iob[transmits_posted & MYRI10GE_TRANSMIT_WRAP] = iobuf; 983 984 /* Copy and pad undersized frames, because the NIC does not pad, 985 and we would rather copy small frames than do a gather. */ 986 987 len = iob_len ( iobuf ); 988 if ( len < ETH_ZLEN ) { 989 iob_pad ( iobuf, ETH_ZLEN ); 990 len = ETH_ZLEN; 991 } 992 993 /* Enqueue the packet by writing a descriptor to the NIC. 994 This is a bit tricky because the HW requires 32-bit writes, 995 but the structure has smaller fields. */ 996 997 kreq = &priv->transmit_ring[transmits_posted 998 & priv->transmit_ring_wrap]; 999 kreq->addr_high = 0; 1000 kreq->addr_low = htonl ( virt_to_bus ( iobuf->data ) ); 1001 ( ( uint32 * ) kreq ) [2] = htonl ( 1002 0x0000 << 16 /* pseudo_header_offset */ 1003 | ( len & 0xFFFF ) /* length */ 1004 ); 1005 wmb(); 1006 ( ( uint32 * ) kreq ) [3] = htonl ( 1007 0x00 << 24 /* pad */ 1008 | 0x01 << 16 /* rdma_count */ 1009 | 0x00 << 8 /* cksum_offset */ 1010 | ( MXGEFW_FLAGS_SMALL 1011 | MXGEFW_FLAGS_FIRST 1012 | MXGEFW_FLAGS_NO_TSO ) /* flags */ 1013 ); 1014 wmb(); 1015 1016 /* Mark the slot as consumed and return. */ 1017 1018 priv->transmits_posted = ++transmits_posted; 1019 DBG2_RINGS ( priv ); 1020 return 0; 1021 } 1022 1023 static struct pci_device_id myri10ge_nics[] = { 1024 /* Each of these macros must be a single line to satisfy a script. */ 1025 PCI_ROM ( 0x14c1, 0x0008, "myri10ge", "Myricom 10Gb Ethernet Adapter", 0 ) , 1026 }; 1027 1028 struct pci_driver myri10ge_driver __pci_driver = { 1029 .ids = myri10ge_nics, 1030 .id_count = ( sizeof ( myri10ge_nics ) / sizeof ( myri10ge_nics[0] ) ) , 1031 .probe = myri10ge_pci_probe, 1032 .remove = myri10ge_pci_remove 1033 }; 1034 1035 /* 1036 * Local variables: 1037 * c-basic-offset: 8 1038 * c-indent-level: 8 1039 * tab-width: 8 1040 * End: 1041 */ 1042
