ipxe/src/drivers/net/mlx_ipoib/mt25218.c

/**************************************************************************
Etherboot -  BOOTP/TFTP Bootstrap Program
Skeleton NIC driver for Etherboot
***************************************************************************/

/*
 * 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, or (at
 * your option) any later version.
 */

#include <errno.h>
#include <gpxe/pci.h>
#include <gpxe/iobuf.h>
#include <gpxe/netdevice.h>
#include <gpxe/infiniband.h>

/* to get some global routines like printf */
#include "etherboot.h"
/* to get the interface to the body of the program */
#include "nic.h"

#include "mt25218_imp.c"

struct mlx_nic {
	/** Queue pair handle */
	udqp_t ipoib_qph;
	/** Broadcast Address Vector */
	ud_av_t bcast_av;
	/** Send completion queue */
	cq_t snd_cqh;
	/** Receive completion queue */
	cq_t rcv_cqh;
};

/**
 * Open network device
 *
 * @v netdev		Network device
 * @ret rc		Return status code
 */
static int mlx_open ( struct net_device *netdev ) {

	( void ) netdev;

	return 0;
}

/**
 * Close network device
 *
 * @v netdev		Network device
 */
static void mlx_close ( struct net_device *netdev ) {

	( void ) netdev;

}

#warning "Broadcast address?"
static uint8_t ib_broadcast[IB_ALEN] = { 0xff, };


/**
 * Transmit packet
 *
 * @v netdev		Network device
 * @v iobuf		I/O buffer
 * @ret rc		Return status code
 */
static int mlx_transmit ( struct net_device *netdev,
			  struct io_buffer *iobuf ) {
	struct mlx_nic *mlx = netdev->priv;
	ud_send_wqe_t snd_wqe;
	int rc;

	snd_wqe = alloc_send_wqe ( mlx->ipoib_qph );
	if ( ! snd_wqe ) {
		DBGC ( mlx, "MLX %p out of TX WQEs\n", mlx );
		return -ENOBUFS;
	}

	prep_send_wqe_buf ( mlx->ipoib_qph, mlx->bcast_av, snd_wqe,
			    iobuf->data, 0, iob_len ( iobuf ), 0 );
	if ( ( rc = post_send_req ( mlx->ipoib_qph, snd_wqe, 1 ) ) != 0 ) {
		DBGC ( mlx, "MLX %p could not post TX WQE %p: %s\n",
		       mlx, snd_wqe, strerror ( rc ) );
		free_wqe ( snd_wqe );
		return rc;
	}

	return 0;
}

/**
 * Handle TX completion
 *
 * @v netdev		Network device
 * @v ib_cqe		Completion queue entry
 */
static void mlx_tx_complete ( struct net_device *netdev,
			      struct ib_cqe_st *ib_cqe ) {
	netdev_tx_complete_next_err ( netdev,
				      ( ib_cqe->is_error ? -EIO : 0 ) );
}

/**
 * Handle RX completion
 *
 * @v netdev		Network device
 * @v ib_cqe		Completion queue entry
 */
static void mlx_rx_complete ( struct net_device *netdev,
			      struct ib_cqe_st *ib_cqe ) {
	unsigned int len;
	struct io_buffer *iobuf;
	void *buf;

	/* Check for errors */
	if ( ib_cqe->is_error ) {
		netdev_rx_err ( netdev, NULL, -EIO );
		return;
	}

	/* Allocate I/O buffer */
	len = ( ib_cqe->count - GRH_SIZE );
	iobuf = alloc_iob ( len );
	if ( ! iobuf ) {
		netdev_rx_err ( netdev, NULL, -ENOMEM );
		return;
	}

	/* Fill I/O buffer */
	buf = get_rcv_wqe_buf ( ib_cqe->wqe, 1 );
	memcpy ( iob_put ( iobuf, len ), buf, len );

	/* Hand off to network stack */
	netdev_rx ( netdev, iobuf );
}

/**
 * Poll completion queue
 *
 * @v netdev		Network device
 * @v cq		Completion queue
 * @v handler		Completion handler
 */
static void mlx_poll_cq ( struct net_device *netdev, cq_t cq,
			  void ( * handler ) ( struct net_device *netdev,
					       struct ib_cqe_st *ib_cqe ) ) {
	struct mlx_nic *mlx = netdev->priv;
	struct ib_cqe_st ib_cqe;
	uint8_t num_cqes;

	while ( 1 ) {

		/* Poll for single completion queue entry */
		ib_poll_cq ( cq, &ib_cqe, &num_cqes );

		/* Return if no entries in the queue */
		if ( ! num_cqes )
			return;

		DBGC ( mlx, "MLX %p cpl in %p: err %x send %x "
		       "wqe %p count %lx\n", mlx, cq, ib_cqe.is_error,
		       ib_cqe.is_send, ib_cqe.wqe, ib_cqe.count );

		/* Handle TX/RX completion */
		handler ( netdev, &ib_cqe );

		/* Free associated work queue entry */
		free_wqe ( ib_cqe.wqe );
	}
}

/**
 * Poll for completed and received packets
 *
 * @v netdev		Network device
 */
static void mlx_poll ( struct net_device *netdev ) {
	struct mlx_nic *mlx = netdev->priv;
	int rc;

	if ( ( rc = poll_error_buf() ) != 0 ) {
		DBG ( "poll_error_buf() failed: %s\n", strerror ( rc ) );
		return;
	}

	/* Drain event queue.  We can ignore events, since we're going
	 * to just poll all completion queues anyway.
	 */
	if ( ( rc = drain_eq() ) != 0 ) {
		DBG ( "drain_eq() failed: %s\n", strerror ( rc ) );
		return;
	}

	/* Poll completion queues */
	mlx_poll_cq ( netdev, mlx->snd_cqh, mlx_tx_complete );
	mlx_poll_cq ( netdev, mlx->rcv_cqh, mlx_rx_complete );
}

/**
 * Enable or disable interrupts
 *
 * @v netdev		Network device
 * @v enable		Interrupts should be enabled
 */
static void mlx_irq ( struct net_device *netdev, int enable ) {

	( void ) netdev;
	( void ) enable;

}

static struct net_device_operations mlx_operations = {
	.open		= mlx_open,
	.close		= mlx_close,
	.transmit	= mlx_transmit,
	.poll		= mlx_poll,
	.irq		= mlx_irq,
};

/**
 * Remove PCI device
 *
 * @v pci		PCI device
 */
static void mlx_remove ( struct pci_device *pci ) {
	struct net_device *netdev = pci_get_drvdata ( pci );

	unregister_netdev ( netdev );
	ib_driver_close ( 0 );
	netdev_nullify ( netdev );
	netdev_put ( netdev );
}

/**
 * Probe PCI device
 *
 * @v pci		PCI device
 * @v id		PCI ID
 * @ret rc		Return status code
 */
static int mlx_probe ( struct pci_device *pci,
		       const struct pci_device_id *id __unused ) {
	struct net_device *netdev;
	struct mlx_nic *mlx;
	struct ib_mac *mac;
	udqp_t qph;
	int rc;

	/* Allocate net device */
	netdev = alloc_ibdev ( sizeof ( *mlx ) );
	if ( ! netdev )
		return -ENOMEM;
	netdev_init ( netdev, &mlx_operations );
	mlx = netdev->priv;
	pci_set_drvdata ( pci, netdev );
	netdev->dev = &pci->dev;
	memset ( mlx, 0, sizeof ( *mlx ) );

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

	/* Initialise hardware */
	if ( ( rc = ib_driver_init ( pci, &qph ) ) != 0 )
		goto err_ipoib_init;
	mlx->ipoib_qph = qph;
	mlx->bcast_av = ib_data.bcast_av;
	mlx->snd_cqh = ib_data.ipoib_snd_cq;
	mlx->rcv_cqh = ib_data.ipoib_rcv_cq;
	mac = ( ( struct ib_mac * ) netdev->ll_addr );
	mac->qpn = htonl ( ib_get_qpn ( mlx->ipoib_qph ) );
	memcpy ( &mac->gid, ib_data.port_gid.raw, sizeof ( mac->gid ) );

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

	return 0;

 err_register_netdev:
 err_ipoib_init:
	ib_driver_close ( 0 );
	netdev_nullify ( netdev );
	netdev_put ( netdev );
	return rc;
}

static struct pci_device_id mlx_nics[] = {
	PCI_ROM ( 0x15b3, 0x6282, "MT25218", "MT25218 HCA driver" ),
	PCI_ROM ( 0x15b3, 0x6274, "MT25204", "MT25204 HCA driver" ),
};

struct pci_driver mlx_driver __pci_driver = {
	.ids = mlx_nics,
	.id_count = ( sizeof ( mlx_nics ) / sizeof ( mlx_nics[0] ) ),
	.probe = mlx_probe,
	.remove = mlx_remove,
};