intelxvf.c

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/*
 * Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 * You can also choose to distribute this program under the terms of
 * the Unmodified Binary Distribution Licence (as given in the file
 * COPYING.UBDL), provided that you have satisfied its requirements.
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <ipxe/io.h>
#include <ipxe/pci.h>
#include <ipxe/netdevice.h>
#include <ipxe/ethernet.h>
#include "intelx.h"
#include "intelxvf.h"

/** @file
 *
 * Intel 10 Gigabit Ethernet virtual function network card driver
 *
 */

/******************************************************************************
 *
 * Diagnostics
 *
 ******************************************************************************
 */

/**
 * Dump statistics
 *
 * @v intel             Intel device
 */
static __attribute__ (( unused )) void
intelxvf_stats ( struct intel_nic *intel ) {

        DBGC ( intel, "INTEL %p TX %d (%#x%08x) RX %d (%#x%08x) multi %d\n",
               intel, readl ( intel->regs + INTELXVF_GPTC ),
               readl ( intel->regs + INTELXVF_GOTCH ),
               readl ( intel->regs + INTELXVF_GOTCL ),
               readl ( intel->regs + INTELXVF_GPRC ),
               readl ( intel->regs + INTELXVF_GORCH ),
               readl ( intel->regs + INTELXVF_GORCL ),
               readl ( intel->regs + INTELXVF_MPRC ) );
}

/******************************************************************************
 *
 * Device reset
 *
 ******************************************************************************
 */

/**
 * Reset hardware
 *
 * @v intel             Intel device
 */
static void intelxvf_reset ( struct intel_nic *intel ) {

        /* Perform a function-level reset */
        writel ( INTELXVF_CTRL_RST, intel->regs + INTELXVF_CTRL );
}

/******************************************************************************
 *
 * Link state
 *
 ******************************************************************************
 */

/**
 * Check link state
 *
 * @v netdev            Network device
 */
static void intelxvf_check_link ( struct net_device *netdev ) {
        struct intel_nic *intel = netdev->priv;
        uint32_t links;

        /* Read link status */
        links = readl ( intel->regs + INTELXVF_LINKS );
        DBGC ( intel, "INTEL %p link status is %08x\n", intel, links );

        /* Update network device */
        if ( links & INTELXVF_LINKS_UP ) {
                netdev_link_up ( netdev );
        } else {
                netdev_link_down ( netdev );
        }
}

/******************************************************************************
 *
 * Mailbox messages
 *
 ******************************************************************************
 */

/**
 * Send negotiate API version message
 *
 * @v intel             Intel device
 * @v version           Requested version
 * @ret rc              Return status code
 */
static int intelxvf_mbox_version ( struct intel_nic *intel,
                                   unsigned int version ) {
        union intelvf_msg msg;
        int rc;

        /* Send set MTU message */
        memset ( &msg, 0, sizeof ( msg ) );
        msg.hdr = INTELXVF_MSG_TYPE_VERSION;
        msg.version.version = version;
        if ( ( rc = intelvf_mbox_msg ( intel, &msg ) ) != 0 ) {
                DBGC ( intel, "INTEL %p negotiate API version failed: %s\n",
                       intel, strerror ( rc ) );
                return rc;
        }

        /* Check response */
        if ( ( msg.hdr & INTELVF_MSG_TYPE_MASK ) != INTELXVF_MSG_TYPE_VERSION ){
                DBGC ( intel, "INTEL %p negotiate API version unexpected "
                       "response:\n", intel );
                DBGC_HDA ( intel, 0, &msg, sizeof ( msg ) );
                return -EPROTO;
        }

        /* Check that this version is supported */
        if ( ! ( msg.hdr & INTELVF_MSG_ACK ) ) {
                DBGC ( intel, "INTEL %p negotiate API version failed\n",
                       intel );
                return -EPERM;
        }

        return 0;
}

/**
 * Get queue configuration
 *
 * @v intel             Intel device
 * @v vlan_thing        VLAN hand-waving thing to fill in
 * @ret rc              Return status code
 */
static int intelxvf_mbox_queues ( struct intel_nic *intel, int *vlan_thing ) {
        union intelvf_msg msg;
        int rc;

        /* Send queue configuration message */
        memset ( &msg, 0, sizeof ( msg ) );
        msg.hdr = INTELVF_MSG_TYPE_GET_QUEUES;
        if ( ( rc = intelvf_mbox_msg ( intel, &msg ) ) != 0 ) {
                DBGC ( intel, "INTEL %p get queue configuration failed: %s\n",
                       intel, strerror ( rc ) );
                return rc;
        }

        /* Check response */
        if ( ( msg.hdr & INTELVF_MSG_TYPE_MASK ) !=INTELVF_MSG_TYPE_GET_QUEUES){
                DBGC ( intel, "INTEL %p get queue configuration unexpected "
                       "response:\n", intel );
                DBGC_HDA ( intel, 0, &msg, sizeof ( msg ) );
                return -EPROTO;
        }

        /* Check that we were allowed to get the queue configuration */
        if ( ! ( msg.hdr & INTELVF_MSG_ACK ) ) {
                DBGC ( intel, "INTEL %p get queue configuration refused\n",
                       intel );
                return -EPERM;
        }

        /* Extract VLAN hand-waving thing */
        *vlan_thing = msg.queues.vlan_thing;

        return 0;
}

/******************************************************************************
 *
 * Network device interface
 *
 ******************************************************************************
 */

/**
 * Open network device
 *
 * @v netdev            Network device
 * @ret rc              Return status code
 */
static int intelxvf_open ( struct net_device *netdev ) {
        struct intel_nic *intel = netdev->priv;
        uint32_t rxdctl;
        uint32_t srrctl;
        uint32_t dca_rxctrl;
        unsigned int i;
        int vlan_thing;
        int rc;

        /* Reset the function */
        intelxvf_reset ( intel );

        /* Notify PF that reset is complete */
        if ( ( rc = intelvf_mbox_reset ( intel, NULL ) ) != 0 ) {
                DBGC ( intel, "INTEL %p could not reset: %s\n",
                       intel, strerror ( rc ) );
                goto err_mbox_reset;
        }

        /* Negotiate API version 1.1.  If we do not negotiate at least
         * this version, then the RX datapath will remain disabled if
         * the PF has jumbo frames enabled.
         *
         * Ignore failures, since the host may not actually support
         * v1.1.
         */
        intelxvf_mbox_version ( intel, INTELXVF_MSG_VERSION_1_1 );

        /* Set MAC address */
        if ( ( rc = intelvf_mbox_set_mac ( intel, netdev->ll_addr ) ) != 0 ) {
                DBGC ( intel, "INTEL %p could not set MAC address: %s\n",
                       intel, strerror ( rc ) );
                goto err_mbox_set_mac;
        }

        /* Set MTU */
        if ( ( rc = intelvf_mbox_set_mtu ( intel, netdev->max_pkt_len ) ) != 0){
                DBGC ( intel, "INTEL %p could not set MTU %zd: %s\n",
                       intel, netdev->max_pkt_len, strerror ( rc ) );
                goto err_mbox_set_mtu;
        }

        /* Reset all descriptor rings */
        for ( i = 0 ; i < INTELXVF_NUM_RINGS ; i++ ) {
                intel_reset_ring ( intel, INTELXVF_TD ( i ) );
                intel_reset_ring ( intel, INTELXVF_RD ( i ) );
        }

        /* Reset packet split receive type register */
        writel ( 0, intel->regs + INTELXVF_PSRTYPE );

        /* Get queue configuration.  Ignore failures, since the host
         * may not support this message.
         */
        vlan_thing = 0;
        intelxvf_mbox_queues ( intel, &vlan_thing );
        if ( vlan_thing ) {
                DBGC ( intel, "INTEL %p stripping VLAN tags (thing=%d)\n",
                       intel, vlan_thing );
                rxdctl = readl ( intel->regs + INTELXVF_RD(0) + INTEL_xDCTL );
                rxdctl |= INTELX_RXDCTL_VME;
                writel ( rxdctl, intel->regs + INTELXVF_RD(0) + INTEL_xDCTL );
        }

        /* Create transmit descriptor ring */
        if ( ( rc = intel_create_ring ( intel, &intel->tx ) ) != 0 )
                goto err_create_tx;

        /* Create receive descriptor ring */
        if ( ( rc = intel_create_ring ( intel, &intel->rx ) ) != 0 )
                goto err_create_rx;

        /* Allocate interrupt vectors */
        writel ( ( INTELXVF_IVAR_RX0_DEFAULT | INTELXVF_IVAR_RX0_VALID |
                   INTELXVF_IVAR_TX0_DEFAULT | INTELXVF_IVAR_TX0_VALID ),
                 intel->regs + INTELXVF_IVAR );
        writel ( ( INTELXVF_IVARM_MBOX_DEFAULT | INTELXVF_IVARM_MBOX_VALID ),
                 intel->regs + INTELXVF_IVARM );

        /* Configure receive buffer sizes and set receive descriptor type */
        srrctl = readl ( intel->regs + INTELXVF_SRRCTL );
        srrctl &= ~( INTELXVF_SRRCTL_BSIZE_MASK |
                     INTELXVF_SRRCTL_BHDRSIZE_MASK |
                     INTELXVF_SRRCTL_DESCTYPE_MASK );
        srrctl |= ( INTELXVF_SRRCTL_BSIZE_DEFAULT |
                    INTELXVF_SRRCTL_BHDRSIZE_DEFAULT |
                    INTELXVF_SRRCTL_DESCTYPE_DEFAULT |
                    INTELXVF_SRRCTL_DROP_EN );
        writel ( srrctl, intel->regs + INTELXVF_SRRCTL );

        /* Clear "must-be-zero" bit for direct cache access (DCA).  We
         * leave DCA disabled anyway, but if we do not clear this bit
         * then the received packets contain garbage data.
         */
        dca_rxctrl = readl ( intel->regs + INTELXVF_DCA_RXCTRL );
        dca_rxctrl &= ~INTELXVF_DCA_RXCTRL_MUST_BE_ZERO;
        writel ( dca_rxctrl, intel->regs + INTELXVF_DCA_RXCTRL );

        /* Fill receive ring */
        intel_refill_rx ( intel );

        /* Update link state */
        intelxvf_check_link ( netdev );

        return 0;

        intel_destroy_ring ( intel, &intel->rx );
 err_create_rx:
        intel_destroy_ring ( intel, &intel->tx );
 err_create_tx:
 err_mbox_set_mtu:
 err_mbox_set_mac:
 err_mbox_reset:
        intelxvf_reset ( intel );
        return rc;
}

/**
 * Close network device
 *
 * @v netdev            Network device
 */
static void intelxvf_close ( struct net_device *netdev ) {
        struct intel_nic *intel = netdev->priv;

        /* Destroy receive descriptor ring */
        intel_destroy_ring ( intel, &intel->rx );

        /* Discard any unused receive buffers */
        intel_empty_rx ( intel );

        /* Destroy transmit descriptor ring */
        intel_destroy_ring ( intel, &intel->tx );

        /* Reset the function */
        intelxvf_reset ( intel );
}

/**
 * Poll for completed and received packets
 *
 * @v netdev            Network device
 */
static void intelxvf_poll ( struct net_device *netdev ) {
        struct intel_nic *intel = netdev->priv;
        uint32_t eicr;
        int rc;

        /* Check for and acknowledge interrupts */
        eicr = readl ( intel->regs + INTELXVF_EICR );
        if ( ! eicr )
                return;

        /* Poll for TX completions, if applicable */
        if ( eicr & INTELXVF_EIRQ_TX0 )
                intel_poll_tx ( netdev );

        /* Poll for RX completions, if applicable */
        if ( eicr & INTELXVF_EIRQ_RX0 )
                intel_poll_rx ( netdev );

        /* Poll for mailbox messages, if applicable */
        if ( eicr & INTELXVF_EIRQ_MBOX ) {

                /* Poll mailbox */
                if ( ( rc = intelvf_mbox_poll ( intel ) ) != 0 ) {
                        DBGC ( intel, "INTEL %p mailbox poll failed!\n",
                               intel );
                        netdev_rx_err ( netdev, NULL, rc );
                }

                /* Update link state */
                intelxvf_check_link ( netdev );
        }

        /* Refill RX ring */
        intel_refill_rx ( intel );
}

/**
 * Enable or disable interrupts
 *
 * @v netdev            Network device
 * @v enable            Interrupts should be enabled
 */
static void intelxvf_irq ( struct net_device *netdev, int enable ) {
        struct intel_nic *intel = netdev->priv;
        uint32_t mask;

        mask = ( INTELXVF_EIRQ_MBOX | INTELXVF_EIRQ_TX0 | INTELXVF_EIRQ_RX0 );
        if ( enable ) {
                writel ( mask, intel->regs + INTELXVF_EIMS );
        } else {
                writel ( mask, intel->regs + INTELXVF_EIMC );
        }
}

/** Network device operations */
static struct net_device_operations intelxvf_operations = {
        .open           = intelxvf_open,
        .close          = intelxvf_close,
        .transmit       = intel_transmit,
        .poll           = intelxvf_poll,
        .irq            = intelxvf_irq,
};

/******************************************************************************
 *
 * PCI interface
 *
 ******************************************************************************
 */

/**
 * Probe PCI device
 *
 * @v pci               PCI device
 * @ret rc              Return status code
 */
static int intelxvf_probe ( struct pci_device *pci ) {
        struct net_device *netdev;
        struct intel_nic *intel;
        int rc;

        /* Allocate and initialise net device */
        netdev = alloc_etherdev ( sizeof ( *intel ) );
        if ( ! netdev ) {
                rc = -ENOMEM;
                goto err_alloc;
        }
        netdev_init ( netdev, &intelxvf_operations );
        intel = netdev->priv;
        pci_set_drvdata ( pci, netdev );
        netdev->dev = &pci->dev;
        memset ( intel, 0, sizeof ( *intel ) );
        intel_init_mbox ( &intel->mbox, INTELXVF_MBCTRL, INTELXVF_MBMEM );
        intel_init_ring ( &intel->tx, INTEL_NUM_TX_DESC, INTELXVF_TD(0),
                          intel_describe_tx_adv );
        intel_init_ring ( &intel->rx, INTEL_NUM_RX_DESC, INTELXVF_RD(0),
                          intel_describe_rx );

        /* Fix up PCI device */
        adjust_pci_device ( pci );

        /* Map registers */
        intel->regs = pci_ioremap ( pci, pci->membase, INTELVF_BAR_SIZE );
        if ( ! intel->regs ) {
                rc = -ENODEV;
                goto err_ioremap;
        }

        /* Configure DMA */
        intel->dma = &pci->dma;
        dma_set_mask_64bit ( intel->dma );
        netdev->dma = intel->dma;

        /* Reset the function */
        intelxvf_reset ( intel );

        /* Send reset message and fetch MAC address */
        if ( ( rc = intelvf_mbox_reset ( intel, netdev->hw_addr ) ) != 0 ) {
                DBGC ( intel, "INTEL %p could not reset and fetch MAC: %s\n",
                       intel, strerror ( rc ) );
                goto err_mbox_reset;
        }

        /* Reset the function (since we will not respond to Control
         * ("ping") mailbox messages until the network device is opened.
         */
        intelxvf_reset ( intel );

        /* Register network device */
        if ( ( rc = register_netdev ( netdev ) ) != 0 )
                goto err_register_netdev;

        /* Set initial link state */
        intelxvf_check_link ( netdev );

        return 0;

        unregister_netdev ( netdev );
 err_register_netdev:
 err_mbox_reset:
        intelxvf_reset ( intel );
        iounmap ( intel->regs );
 err_ioremap:
        netdev_nullify ( netdev );
        netdev_put ( netdev );
 err_alloc:
        return rc;
}

/**
 * Remove PCI device
 *
 * @v pci               PCI device
 */
static void intelxvf_remove ( struct pci_device *pci ) {
        struct net_device *netdev = pci_get_drvdata ( pci );
        struct intel_nic *intel = netdev->priv;

        /* Unregister network device */
        unregister_netdev ( netdev );

        /* Reset the NIC */
        intelxvf_reset ( intel );

        /* Free network device */
        iounmap ( intel->regs );
        netdev_nullify ( netdev );
        netdev_put ( netdev );
}

/** PCI device IDs */
static struct pci_device_id intelxvf_nics[] = {
        PCI_ROM ( 0x8086, 0x10ed, "82599-vf", "82599 VF", 0 ),
        PCI_ROM ( 0x8086, 0x1515, "x540-vf", "X540 VF", 0 ),
        PCI_ROM ( 0x8086, 0x1565, "x550-vf", "X550 VF", 0 ),
        PCI_ROM ( 0x8086, 0x15a8, "x552-vf", "X552 VF", 0 ),
        PCI_ROM ( 0x8086, 0x15c5, "x557-vf", "X557-AT2 VF", 0 ),
};

/** PCI driver */
struct pci_driver intelxvf_driver __pci_driver = {
        .ids = intelxvf_nics,
        .id_count = ( sizeof ( intelxvf_nics ) / sizeof ( intelxvf_nics[0] ) ),
        .probe = intelxvf_probe,
        .remove = intelxvf_remove,
};