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-rw-r--r--gpxe/src/drivers/net/myri10ge.c1041
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diff --git a/gpxe/src/drivers/net/myri10ge.c b/gpxe/src/drivers/net/myri10ge.c
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+/************************************************* -*- 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:
+ */