diff options
Diffstat (limited to 'gpxe/src/drivers/net/myri10ge.c')
| -rw-r--r-- | gpxe/src/drivers/net/myri10ge.c | 1041 |
1 files changed, 0 insertions, 1041 deletions
diff --git a/gpxe/src/drivers/net/myri10ge.c b/gpxe/src/drivers/net/myri10ge.c deleted file mode 100644 index ac2e1245..00000000 --- a/gpxe/src/drivers/net/myri10ge.c +++ /dev/null @@ -1,1041 +0,0 @@ -/************************************************* -*- linux-c -*- - * Myricom 10Gb Network Interface Card Software - * Copyright 2009, Myricom, Inc. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - ****************************************************************/ - -FILE_LICENCE ( GPL2_ONLY ); - -/* - * Author: Glenn Brown <glenn@myri.com> - */ - -/* - * General Theory of Operation - * - * This is a minimal Myricom 10 gigabit Ethernet driver for network - * boot. - * - * Initialization - * - * myri10ge_pci_probe() is called by gPXE during initialization. - * Minimal NIC initialization is performed to minimize resources - * consumed when the driver is resident but unused. - * - * Network Boot - * - * myri10ge_net_open() is called by gPXE before attempting to network - * boot from the card. Packet buffers are allocated and the NIC - * interface is initialized. - * - * Transmit - * - * myri10ge_net_transmit() enqueues frames for transmission by writing - * discriptors to the NIC's tx ring. For simplicity and to avoid - * copies, we always have the NIC DMA up the packet. The sent I/O - * buffer is released once the NIC signals myri10ge_interrupt_handler() - * that the send has completed. - * - * Receive - * - * Receives are posted to the NIC's receive ring. The NIC fills a - * DMAable receive_completion ring with completion notifications. - * myri10ge_net_poll() polls for these receive notifications, posts - * replacement receive buffers to the NIC, and passes received frames - * to netdev_rx(). - */ - -/* - * Debugging levels: - * - DBG() is for any errors, i.e. failed alloc_iob(), malloc_dma(), - * TX overflow, corrupted packets, ... - * - DBG2() is for successful events, like packet received, - * packet transmitted, and other general notifications. - * - DBGP() prints the name of each called function on entry - */ - -#include <stdint.h> - -#include <byteswap.h> -#include <errno.h> -#include <gpxe/ethernet.h> -#include <gpxe/if_ether.h> -#include <gpxe/iobuf.h> -#include <gpxe/malloc.h> -#include <gpxe/netdevice.h> -#include <gpxe/pci.h> -#include <gpxe/timer.h> - -#include "myri10ge_mcp.h" - -/**************************************************************** - * Forward declarations - ****************************************************************/ - -/* PCI driver entry points */ - -static int myri10ge_pci_probe ( struct pci_device*, - const struct pci_device_id* ); -static void myri10ge_pci_remove ( struct pci_device* ); - -/* Network device operations */ - -static void myri10ge_net_close ( struct net_device* ); -static void myri10ge_net_irq ( struct net_device*, int enable ); -static int myri10ge_net_open ( struct net_device* ); -static void myri10ge_net_poll ( struct net_device* ); -static int myri10ge_net_transmit ( struct net_device*, struct io_buffer* ); - -/**************************************************************** - * Constants - ****************************************************************/ - -/* Maximum ring indices, used to wrap ring indices. These must be 2**N-1. */ - -#define MYRI10GE_TRANSMIT_WRAP 1U -#define MYRI10GE_RECEIVE_WRAP 7U -#define MYRI10GE_RECEIVE_COMPLETION_WRAP 31U - -/**************************************************************** - * Driver internal data types. - ****************************************************************/ - -/* Structure holding all DMA buffers for a NIC, which we will - allocated as contiguous read/write DMAable memory when the NIC is - initialized. */ - -struct myri10ge_dma_buffers -{ - /* The NIC DMAs receive completion notifications into this ring */ - - mcp_slot_t receive_completion[1+MYRI10GE_RECEIVE_COMPLETION_WRAP]; - - /* Interrupt details are DMAd here before interrupting. */ - - mcp_irq_data_t irq_data; /* 64B */ - - /* NIC command completion status is DMAd here. */ - - mcp_cmd_response_t command_response; /* 8B */ -}; - -struct myri10ge_private -{ - /* Interrupt support */ - - uint32 *irq_claim; /* in NIC SRAM */ - uint32 *irq_deassert; /* in NIC SRAM */ - - /* DMA buffers. */ - - struct myri10ge_dma_buffers *dma; - - /* - * Transmit state. - * - * The counts here are uint32 for easy comparison with - * priv->dma->irq_data.send_done_count and with each other. - */ - - mcp_kreq_ether_send_t *transmit_ring; /* in NIC SRAM */ - uint32 transmit_ring_wrap; - uint32 transmits_posted; - uint32 transmits_done; - struct io_buffer *transmit_iob[1 + MYRI10GE_TRANSMIT_WRAP]; - - /* - * Receive state. - */ - - mcp_kreq_ether_recv_t *receive_post_ring; /* in NIC SRAM */ - unsigned int receive_post_ring_wrap; - unsigned int receives_posted; - unsigned int receives_done; - struct io_buffer *receive_iob[1 + MYRI10GE_RECEIVE_WRAP]; - - /* Address for writing commands to the firmware. - BEWARE: the value must be written 32 bits at a time. */ - - mcp_cmd_t *command; -}; - -/**************************************************************** - * Driver internal functions. - ****************************************************************/ - -/* Print ring status when debugging. Use this only after a printed - value changes. */ - -#define DBG2_RINGS( priv ) \ - DBG2 ( "tx %x/%x rx %x/%x in %s() \n", \ - ( priv ) ->transmits_done, ( priv ) -> transmits_posted, \ - ( priv ) ->receives_done, ( priv ) -> receives_posted, \ - __FUNCTION__ ) - -/* - * Return a pointer to the driver private data for a network device. - * - * @v netdev Network device created by this driver. - * @ret priv The corresponding driver private data. - */ -static inline struct myri10ge_private *myri10ge_priv ( struct net_device *nd ) -{ - /* Our private data always follows the network device in memory, - since we use alloc_netdev() to allocate the storage. */ - - return ( struct myri10ge_private * ) ( nd + 1 ); -} - -/* - * Pass a receive buffer to the NIC to be filled. - * - * @v priv The network device to receive the buffer. - * @v iob The I/O buffer to fill. - * - * Receive buffers are filled in FIFO order. - */ -static void myri10ge_post_receive ( struct myri10ge_private *priv, - struct io_buffer *iob ) -{ - unsigned int receives_posted; - mcp_kreq_ether_recv_t *request; - - /* Record the posted I/O buffer, to be passed to netdev_rx() on - receive. */ - - receives_posted = priv->receives_posted; - priv->receive_iob[receives_posted & MYRI10GE_RECEIVE_WRAP] = iob; - - /* Post the receive. */ - - request = &priv->receive_post_ring[receives_posted - & priv->receive_post_ring_wrap]; - request->addr_high = 0; - wmb(); - request->addr_low = htonl ( virt_to_bus ( iob->data ) ); - priv->receives_posted = ++receives_posted; -} - -/* - * Execute a command on the NIC. - * - * @v priv NIC to perform the command. - * @v cmd The command to perform. - * @v data I/O copy buffer for parameters/results - * @ret rc 0 on success, else an error code. - */ -static int myri10ge_command ( struct myri10ge_private *priv, - uint32 cmd, - uint32 data[3] ) -{ - int i; - mcp_cmd_t *command; - uint32 result; - unsigned int slept_ms; - volatile mcp_cmd_response_t *response; - - DBGP ( "myri10ge_command ( ,%d, ) \n", cmd ); - command = priv->command; - response = &priv->dma->command_response; - - /* Mark the command as incomplete. */ - - response->result = 0xFFFFFFFF; - - /* Pass the command to the NIC. */ - - command->cmd = htonl ( cmd ); - command->data0 = htonl ( data[0] ); - command->data1 = htonl ( data[1] ); - command->data2 = htonl ( data[2] ); - command->response_addr.high = 0; - command->response_addr.low - = htonl ( virt_to_bus ( &priv->dma->command_response ) ); - for ( i=0; i<36; i+=4 ) - * ( uint32 * ) &command->pad[i] = 0; - wmb(); - * ( uint32 * ) &command->pad[36] = 0; - - /* Wait up to 2 seconds for a response. */ - - for ( slept_ms=0; slept_ms<2000; slept_ms++ ) { - result = response->result; - if ( result == 0 ) { - data[0] = ntohl ( response->data ); - return 0; - } else if ( result != 0xFFFFFFFF ) { - DBG ( "cmd%d:0x%x\n", - cmd, - ntohl ( response->result ) ); - return -EIO; - } - udelay ( 1000 ); - rmb(); - } - DBG ( "cmd%d:timed out\n", cmd ); - return -ETIMEDOUT; -} - -/* - * Handle any pending interrupt. - * - * @v netdev Device being polled for interrupts. - * - * This is called periodically to let the driver check for interrupts. - */ -static void myri10ge_interrupt_handler ( struct net_device *netdev ) -{ - struct myri10ge_private *priv; - mcp_irq_data_t *irq_data; - uint8 valid; - - priv = myri10ge_priv ( netdev ); - irq_data = &priv->dma->irq_data; - - /* Return if there was no interrupt. */ - - rmb(); - valid = irq_data->valid; - if ( !valid ) - return; - DBG2 ( "irq " ); - - /* Tell the NIC to deassert the interrupt and clear - irq_data->valid.*/ - - *priv->irq_deassert = 0; /* any value is OK. */ - mb(); - - /* Handle any new receives. */ - - if ( valid & 1 ) { - - /* Pass the receive interrupt token back to the NIC. */ - - DBG2 ( "rx " ); - *priv->irq_claim = htonl ( 3 ); - wmb(); - } - - /* Handle any sent packet by freeing its I/O buffer, now that - we know it has been DMAd. */ - - if ( valid & 2 ) { - unsigned int nic_done_count; - - DBG2 ( "snt " ); - nic_done_count = ntohl ( priv->dma->irq_data.send_done_count ); - while ( priv->transmits_done != nic_done_count ) { - struct io_buffer *iob; - - iob = priv->transmit_iob [priv->transmits_done - & MYRI10GE_TRANSMIT_WRAP]; - DBG2 ( "%p ", iob ); - netdev_tx_complete ( netdev, iob ); - ++priv->transmits_done; - } - } - - /* Record any statistics update. */ - - if ( irq_data->stats_updated ) { - - /* Update the link status. */ - - DBG2 ( "stats " ); - if ( ntohl ( irq_data->link_up ) == MXGEFW_LINK_UP ) - netdev_link_up ( netdev ); - else - netdev_link_down ( netdev ); - - /* Ignore all error counters from the NIC. */ - } - - /* Wait for the interrupt to be deasserted, as indicated by - irq_data->valid, which is set by the NIC after the deassert. */ - - DBG2 ( "wait " ); - do { - mb(); - } while ( irq_data->valid ); - - /* Claim the interrupt to enable future interrupt generation. */ - - DBG2 ( "claim\n" ); - * ( priv->irq_claim + 1 ) = htonl ( 3 ); - mb(); -} - -/* Constants for reading the STRING_SPECS via the Myricom - Vendor Specific PCI configuration space capability. */ - -#define VS_ADDR ( vs + 0x18 ) -#define VS_DATA ( vs + 0x14 ) -#define VS_MODE ( vs + 0x10 ) -#define VS_MODE_READ32 0x3 -#define VS_MODE_LOCATE 0x8 -#define VS_LOCATE_STRING_SPECS 0x3 - -/* - * Read MAC address from its 'string specs' via the vendor-specific - * capability. (This capability allows NIC SRAM and ROM to be read - * before it is mapped.) - * - * @v pci The device. - * @v mac Buffer to store the MAC address. - * @ret rc Returns 0 on success, else an error code. - */ -static int mac_address_from_string_specs ( struct pci_device *pci, - uint8 mac[ETH_ALEN] ) -{ - char string_specs[256]; - char *ptr, *limit; - char *to = string_specs; - uint32 addr; - uint32 len; - unsigned int vs; - int mac_set = 0; - - /* Find the "vendor specific" capability. */ - - vs = pci_find_capability ( pci, 9 ); - if ( vs == 0 ) { - DBG ( "no VS\n" ); - return -ENOTSUP; - } - - /* Locate the String specs in LANai SRAM. */ - - pci_write_config_byte ( pci, VS_MODE, VS_MODE_LOCATE ); - pci_write_config_dword ( pci, VS_ADDR, VS_LOCATE_STRING_SPECS ); - pci_read_config_dword ( pci, VS_ADDR, &addr ); - pci_read_config_dword ( pci, VS_DATA, &len ); - DBG2 ( "ss@%x,%x\n", addr, len ); - - /* Copy in the string specs. Use 32-bit reads for performance. */ - - if ( len > sizeof ( string_specs ) || ( len & 3 ) ) { - DBG ( "SS too big\n" ); - return -ENOTSUP; - } - - pci_write_config_byte ( pci, VS_MODE, VS_MODE_READ32 ); - while ( len >= 4 ) { - uint32 tmp; - - pci_write_config_byte ( pci, VS_ADDR, addr ); - pci_read_config_dword ( pci, VS_DATA, &tmp ); - tmp = ntohl ( tmp ); - memcpy ( to, &tmp, 4 ); - to += 4; - addr += 4; - len -= 4; - } - pci_write_config_byte ( pci, VS_MODE, 0 ); - - /* Parse the string specs. */ - - DBG2 ( "STRING_SPECS:\n" ); - ptr = string_specs; - limit = string_specs + sizeof ( string_specs ); - while ( *ptr != '\0' && ptr < limit ) { - DBG2 ( "%s\n", ptr ); - if ( memcmp ( ptr, "MAC=", 4 ) == 0 ) { - unsigned int i; - - ptr += 4; - for ( i=0; i<6; i++ ) { - if ( ( ptr + 2 ) > limit ) { - DBG ( "bad MAC addr\n" ); - return -ENOTSUP; - } - mac[i] = strtoul ( ptr, &ptr, 16 ); - ptr += 1; - } - mac_set = 1; - } - else - while ( ptr < limit && *ptr++ ); - } - - /* Verify we parsed all we need. */ - - if ( !mac_set ) { - DBG ( "no MAC addr\n" ); - return -ENOTSUP; - } - - DBG2 ( "MAC %02x:%02x:%02x:%02x:%02x:%02x\n", - mac[0], mac[1], mac[2], mac[3], mac[4], mac[5] ); - - return 0; -} - -/**************************************************************** - * gPXE PCI Device Driver API functions - ****************************************************************/ - -/* - * Initialize the PCI device. - * - * @v pci The device's associated pci_device structure. - * @v id The PCI device + vendor id. - * @ret rc Returns zero if successfully initialized. - * - * This function is called very early on, while gPXE is initializing. - * This is a gPXE PCI Device Driver API function. - */ -static int myri10ge_pci_probe ( struct pci_device *pci, - const struct pci_device_id *id __unused ) -{ - static struct net_device_operations myri10ge_operations = { - .open = myri10ge_net_open, - .close = myri10ge_net_close, - .transmit = myri10ge_net_transmit, - .poll = myri10ge_net_poll, - .irq = myri10ge_net_irq - }; - - const char *dbg; - int rc; - struct net_device *netdev; - struct myri10ge_private *priv; - - DBGP ( "myri10ge_pci_probe: " ); - - netdev = alloc_etherdev ( sizeof ( *priv ) ); - if ( !netdev ) { - rc = -ENOMEM; - dbg = "alloc_etherdev"; - goto abort_with_nothing; - } - - netdev_init ( netdev, &myri10ge_operations ); - priv = myri10ge_priv ( netdev ); - - pci_set_drvdata ( pci, netdev ); - netdev->dev = &pci->dev; - - /* Make sure interrupts are disabled. */ - - myri10ge_net_irq ( netdev, 0 ); - - /* Read the NIC HW address. */ - - rc = mac_address_from_string_specs ( pci, netdev->hw_addr ); - if ( rc ) { - dbg = "mac_from_ss"; - goto abort_with_netdev_init; - } - DBGP ( "mac " ); - - /* Enable bus master, etc. */ - - adjust_pci_device ( pci ); - DBGP ( "pci " ); - - /* Register the initialized network device. */ - - rc = register_netdev ( netdev ); - if ( rc ) { - dbg = "register_netdev"; - goto abort_with_netdev_init; - } - - DBGP ( "done\n" ); - - return 0; - -abort_with_netdev_init: - netdev_nullify ( netdev ); - netdev_put ( netdev ); -abort_with_nothing: - DBG ( "%s:%s\n", dbg, strerror ( rc ) ); - return rc; -} - -/* - * Remove a device from the PCI device list. - * - * @v pci PCI device to remove. - * - * This is a PCI Device Driver API function. - */ -static void myri10ge_pci_remove ( struct pci_device *pci ) -{ - struct net_device *netdev; - - DBGP ( "myri10ge_pci_remove\n" ); - netdev = pci_get_drvdata ( pci ); - - unregister_netdev ( netdev ); - netdev_nullify ( netdev ); - netdev_put ( netdev ); -} - -/**************************************************************** - * gPXE Network Device Driver Operations - ****************************************************************/ - -/* - * Close a network device. - * - * @v netdev Device to close. - * - * This is a gPXE Network Device Driver API function. - */ -static void myri10ge_net_close ( struct net_device *netdev ) -{ - struct myri10ge_private *priv; - uint32 data[3]; - - DBGP ( "myri10ge_net_close\n" ); - priv = myri10ge_priv ( netdev ); - - /* disable interrupts */ - - myri10ge_net_irq ( netdev, 0 ); - - /* Reset the NIC interface, so we won't get any more events from - the NIC. */ - - myri10ge_command ( priv, MXGEFW_CMD_RESET, data ); - - /* Free receive buffers that were never filled. */ - - while ( priv->receives_done != priv->receives_posted ) { - free_iob ( priv->receive_iob[priv->receives_done - & MYRI10GE_RECEIVE_WRAP] ); - ++priv->receives_done; - } - - /* Release DMAable memory. */ - - free_dma ( priv->dma, sizeof ( *priv->dma ) ); - - /* Erase all state from the open. */ - - memset ( priv, 0, sizeof ( *priv ) ); - - DBG2_RINGS ( priv ); -} - -/* - * Enable or disable IRQ masking. - * - * @v netdev Device to control. - * @v enable Zero to mask off IRQ, non-zero to enable IRQ. - * - * This is a gPXE Network Driver API function. - */ -static void myri10ge_net_irq ( struct net_device *netdev, int enable ) -{ - struct pci_device *pci_dev; - uint16 val; - - DBGP ( "myri10ge_net_irq\n" ); - pci_dev = ( struct pci_device * ) netdev->dev; - - /* Adjust the Interrupt Disable bit in the Command register of the - PCI Device. */ - - pci_read_config_word ( pci_dev, PCI_COMMAND, &val ); - if ( enable ) - val &= ~PCI_COMMAND_INTX_DISABLE; - else - val |= PCI_COMMAND_INTX_DISABLE; - pci_write_config_word ( pci_dev, PCI_COMMAND, val ); -} - -/* - * Opens a network device. - * - * @v netdev Device to be opened. - * @ret rc Non-zero if failed to open. - * - * This enables tx and rx on the device. - * This is a gPXE Network Device Driver API function. - */ -static int myri10ge_net_open ( struct net_device *netdev ) -{ - const char *dbg; /* printed upon error return */ - int rc; - struct io_buffer *iob; - struct myri10ge_private *priv; - uint32 data[3]; - struct pci_device *pci_dev; - void *membase; - - DBGP ( "myri10ge_net_open\n" ); - priv = myri10ge_priv ( netdev ); - pci_dev = ( struct pci_device * ) netdev->dev; - membase = phys_to_virt ( pci_dev->membase ); - - /* Compute address for passing commands to the firmware. */ - - priv->command = membase + MXGEFW_ETH_CMD; - - /* Ensure interrupts are disabled. */ - - myri10ge_net_irq ( netdev, 0 ); - - /* Allocate cleared DMAable buffers. */ - - priv->dma = malloc_dma ( sizeof ( *priv->dma ) , 128 ); - if ( !priv->dma ) { - rc = -ENOMEM; - dbg = "DMA"; - goto abort_with_nothing; - } - memset ( priv->dma, 0, sizeof ( *priv->dma ) ); - - /* Simplify following code. */ - -#define TRY( prefix, base, suffix ) do { \ - rc = myri10ge_command ( priv, \ - MXGEFW_ \ - ## prefix \ - ## base \ - ## suffix, \ - data ); \ - if ( rc ) { \ - dbg = #base; \ - goto abort_with_dma; \ - } \ - } while ( 0 ) - - /* Send a reset command to the card to see if it is alive, - and to reset its queue state. */ - - TRY ( CMD_, RESET , ); - - /* Set the interrupt queue size. */ - - data[0] = ( sizeof ( priv->dma->receive_completion ) - | MXGEFW_CMD_SET_INTRQ_SIZE_FLAG_NO_STRICT_SIZE_CHECK ); - TRY ( CMD_SET_ , INTRQ_SIZE , ); - - /* Set the interrupt queue DMA address. */ - - data[0] = virt_to_bus ( &priv->dma->receive_completion ); - data[1] = 0; - TRY ( CMD_SET_, INTRQ_DMA, ); - - /* Get the NIC interrupt claim address. */ - - TRY ( CMD_GET_, IRQ_ACK, _OFFSET ); - priv->irq_claim = membase + data[0]; - - /* Get the NIC interrupt assert address. */ - - TRY ( CMD_GET_, IRQ_DEASSERT, _OFFSET ); - priv->irq_deassert = membase + data[0]; - - /* Disable interrupt coalescing, which is inappropriate for the - minimal buffering we provide. */ - - TRY ( CMD_GET_, INTR_COAL, _DELAY_OFFSET ); - * ( ( uint32 * ) ( membase + data[0] ) ) = 0; - - /* Set the NIC mac address. */ - - data[0] = ( netdev->ll_addr[0] << 24 - | netdev->ll_addr[1] << 16 - | netdev->ll_addr[2] << 8 - | netdev->ll_addr[3] ); - data[1] = ( ( netdev->ll_addr[4] << 8 ) - | netdev->ll_addr[5] ); - TRY ( SET_ , MAC_ADDRESS , ); - - /* Enable multicast receives, because some gPXE clients don't work - without multicast. . */ - - TRY ( ENABLE_ , ALLMULTI , ); - - /* Disable Ethernet flow control, so the NIC cannot deadlock the - network under any circumstances. */ - - TRY ( DISABLE_ , FLOW , _CONTROL ); - - /* Compute transmit ring sizes. */ - - data[0] = 0; /* slice 0 */ - TRY ( CMD_GET_, SEND_RING, _SIZE ); - priv->transmit_ring_wrap - = data[0] / sizeof ( mcp_kreq_ether_send_t ) - 1; - if ( priv->transmit_ring_wrap - & ( priv->transmit_ring_wrap + 1 ) ) { - rc = -EPROTO; - dbg = "TX_RING"; - goto abort_with_dma; - } - - /* Compute receive ring sizes. */ - - data[0] = 0; /* slice 0 */ - TRY ( CMD_GET_ , RX_RING , _SIZE ); - priv->receive_post_ring_wrap = data[0] / sizeof ( mcp_dma_addr_t ) - 1; - if ( priv->receive_post_ring_wrap - & ( priv->receive_post_ring_wrap + 1 ) ) { - rc = -EPROTO; - dbg = "RX_RING"; - goto abort_with_dma; - } - - /* Get NIC transmit ring address. */ - - data[0] = 0; /* slice 0. */ - TRY ( CMD_GET_, SEND, _OFFSET ); - priv->transmit_ring = membase + data[0]; - - /* Get the NIC receive ring address. */ - - data[0] = 0; /* slice 0. */ - TRY ( CMD_GET_, SMALL_RX, _OFFSET ); - priv->receive_post_ring = membase + data[0]; - - /* Set the Nic MTU. */ - - data[0] = ETH_FRAME_LEN; - TRY ( CMD_SET_, MTU, ); - - /* Tell the NIC our buffer sizes. ( We use only small buffers, so we - set both buffer sizes to the same value, which will force all - received frames to use small buffers. ) */ - - data[0] = MXGEFW_PAD + ETH_FRAME_LEN; - TRY ( CMD_SET_, SMALL_BUFFER, _SIZE ); - data[0] = MXGEFW_PAD + ETH_FRAME_LEN; - TRY ( CMD_SET_, BIG_BUFFER, _SIZE ); - - /* Tell firmware where to DMA IRQ data */ - - data[0] = virt_to_bus ( &priv->dma->irq_data ); - data[1] = 0; - data[2] = sizeof ( priv->dma->irq_data ); - TRY ( CMD_SET_, STATS_DMA_V2, ); - - /* Post receives. */ - - while ( priv->receives_posted <= MYRI10GE_RECEIVE_WRAP ) { - - /* Reserve 2 extra bytes at the start of packets, since - the firmware always skips the first 2 bytes of the buffer - so TCP headers will be aligned. */ - - iob = alloc_iob ( MXGEFW_PAD + ETH_FRAME_LEN ); - if ( !iob ) { - rc = -ENOMEM; - dbg = "alloc_iob"; - goto abort_with_receives_posted; - } - iob_reserve ( iob, MXGEFW_PAD ); - myri10ge_post_receive ( priv, iob ); - } - - /* Bring up the link. */ - - TRY ( CMD_, ETHERNET_UP, ); - - DBG2_RINGS ( priv ); - return 0; - -abort_with_receives_posted: - while ( priv->receives_posted-- ) - free_iob ( priv->receive_iob[priv->receives_posted] ); -abort_with_dma: - /* Because the link is not up, we don't have to reset the NIC here. */ - free_dma ( priv->dma, sizeof ( *priv->dma ) ); -abort_with_nothing: - /* Erase all signs of the failed open. */ - memset ( priv, 0, sizeof ( *priv ) ); - DBG ( "%s: %s\n", dbg, strerror ( rc ) ); - return ( rc ); -} - -/* - * This function allows a driver to process events during operation. - * - * @v netdev Device being polled. - * - * This is called periodically by gPXE to let the driver check the status of - * transmitted packets and to allow the driver to check for received packets. - * This is a gPXE Network Device Driver API function. - */ -static void myri10ge_net_poll ( struct net_device *netdev ) -{ - struct io_buffer *iob; - struct io_buffer *replacement; - struct myri10ge_dma_buffers *dma; - struct myri10ge_private *priv; - unsigned int length; - unsigned int orig_receives_posted; - - DBGP ( "myri10ge_net_poll\n" ); - priv = myri10ge_priv ( netdev ); - dma = priv->dma; - - /* Process any pending interrupt. */ - - myri10ge_interrupt_handler ( netdev ); - - /* Pass up received frames, but limit ourselves to receives posted - before this function was called, so we cannot livelock if - receives are arriving faster than we process them. */ - - orig_receives_posted = priv->receives_posted; - while ( priv->receives_done != orig_receives_posted ) { - - /* Stop if there is no pending receive. */ - - length = ntohs ( dma->receive_completion - [priv->receives_done - & MYRI10GE_RECEIVE_COMPLETION_WRAP] - .length ); - if ( length == 0 ) - break; - - /* Allocate a replacement buffer. If none is available, - stop passing up packets until a buffer is available. - - Reserve 2 extra bytes at the start of packets, since - the firmware always skips the first 2 bytes of the buffer - so TCP headers will be aligned. */ - - replacement = alloc_iob ( MXGEFW_PAD + ETH_FRAME_LEN ); - if ( !replacement ) { - DBG ( "NO RX BUF\n" ); - break; - } - iob_reserve ( replacement, MXGEFW_PAD ); - - /* Pass up the received frame. */ - - iob = priv->receive_iob[priv->receives_done - & MYRI10GE_RECEIVE_WRAP]; - iob_put ( iob, length ); - netdev_rx ( netdev, iob ); - - /* We have consumed the packet, so clear the receive - notification. */ - - dma->receive_completion [priv->receives_done - & MYRI10GE_RECEIVE_COMPLETION_WRAP] - .length = 0; - wmb(); - - /* Replace the passed-up I/O buffer. */ - - myri10ge_post_receive ( priv, replacement ); - ++priv->receives_done; - DBG2_RINGS ( priv ); - } -} - -/* - * This transmits a packet. - * - * @v netdev Device to transmit from. - * @v iobuf Data to transmit. - * @ret rc Non-zero if failed to transmit. - * - * This is a gPXE Network Driver API function. - */ -static int myri10ge_net_transmit ( struct net_device *netdev, - struct io_buffer *iobuf ) -{ - mcp_kreq_ether_send_t *kreq; - size_t len; - struct myri10ge_private *priv; - uint32 transmits_posted; - - DBGP ( "myri10ge_net_transmit\n" ); - priv = myri10ge_priv ( netdev ); - - /* Confirm space in the send ring. */ - - transmits_posted = priv->transmits_posted; - if ( transmits_posted - priv->transmits_done - > MYRI10GE_TRANSMIT_WRAP ) { - DBG ( "TX ring full\n" ); - return -ENOBUFS; - } - - DBG2 ( "TX %p+%d ", iobuf->data, iob_len ( iobuf ) ); - DBG2_HD ( iobuf->data, 14 ); - - /* Record the packet being transmitted, so we can later report - send completion. */ - - priv->transmit_iob[transmits_posted & MYRI10GE_TRANSMIT_WRAP] = iobuf; - - /* Copy and pad undersized frames, because the NIC does not pad, - and we would rather copy small frames than do a gather. */ - - len = iob_len ( iobuf ); - if ( len < ETH_ZLEN ) { - iob_pad ( iobuf, ETH_ZLEN ); - len = ETH_ZLEN; - } - - /* Enqueue the packet by writing a descriptor to the NIC. - This is a bit tricky because the HW requires 32-bit writes, - but the structure has smaller fields. */ - - kreq = &priv->transmit_ring[transmits_posted - & priv->transmit_ring_wrap]; - kreq->addr_high = 0; - kreq->addr_low = htonl ( virt_to_bus ( iobuf->data ) ); - ( ( uint32 * ) kreq ) [2] = htonl ( - 0x0000 << 16 /* pseudo_header_offset */ - | ( len & 0xFFFF ) /* length */ - ); - wmb(); - ( ( uint32 * ) kreq ) [3] = htonl ( - 0x00 << 24 /* pad */ - | 0x01 << 16 /* rdma_count */ - | 0x00 << 8 /* cksum_offset */ - | ( MXGEFW_FLAGS_SMALL - | MXGEFW_FLAGS_FIRST - | MXGEFW_FLAGS_NO_TSO ) /* flags */ - ); - wmb(); - - /* Mark the slot as consumed and return. */ - - priv->transmits_posted = ++transmits_posted; - DBG2_RINGS ( priv ); - return 0; -} - -static struct pci_device_id myri10ge_nics[] = { - /* Each of these macros must be a single line to satisfy a script. */ - PCI_ROM ( 0x14c1, 0x0008, "myri10ge", "Myricom 10Gb Ethernet Adapter", 0 ) , -}; - -struct pci_driver myri10ge_driver __pci_driver = { - .ids = myri10ge_nics, - .id_count = ( sizeof ( myri10ge_nics ) / sizeof ( myri10ge_nics[0] ) ) , - .probe = myri10ge_pci_probe, - .remove = myri10ge_pci_remove -}; - -/* - * Local variables: - * c-basic-offset: 8 - * c-indent-level: 8 - * tab-width: 8 - * End: - */ |