path: root/drivers/infiniband/hw/ipath/ipath_init_chip.c

/*
 * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved.
 * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>

#include "ipath_kernel.h"
#include "ipath_common.h"

/*
 * min buffers we want to have per port, after driver
 */
#define IPATH_MIN_USER_PORT_BUFCNT 7

/*
 * Number of ports we are configured to use (to allow for more pio
 * buffers per port, etc.)  Zero means use chip value.
 */
static ushort ipath_cfgports;

module_param_named(cfgports, ipath_cfgports, ushort, S_IRUGO);
MODULE_PARM_DESC(cfgports, "Set max number of ports to use");

/*
 * Number of buffers reserved for driver (verbs and layered drivers.)
 * Initialized based on number of PIO buffers if not set via module interface.
 * The problem with this is that it's global, but we'll use different
 * numbers for different chip types.
 */
static ushort ipath_kpiobufs;

static int ipath_set_kpiobufs(const char *val, struct kernel_param *kp);

module_param_call(kpiobufs, ipath_set_kpiobufs, param_get_ushort,
		  &ipath_kpiobufs, S_IWUSR | S_IRUGO);
MODULE_PARM_DESC(kpiobufs, "Set number of PIO buffers for driver");

/**
 * create_port0_egr - allocate the eager TID buffers
 * @dd: the infinipath device
 *
 * This code is now quite different for user and kernel, because
 * the kernel uses skb's, for the accelerated network performance.
 * This is the kernel (port0) version.
 *
 * Allocate the eager TID buffers and program them into infinipath.
 * We use the network layer alloc_skb() allocator to allocate the
 * memory, and either use the buffers as is for things like verbs
 * packets, or pass the buffers up to the ipath layered driver and
 * thence the network layer, replacing them as we do so (see
 * ipath_rcv_layer()).
 */
static int create_port0_egr(struct ipath_devdata *dd)
{
	unsigned e, egrcnt;
	struct ipath_skbinfo *skbinfo;
	int ret;

	egrcnt = dd->ipath_p0_rcvegrcnt;

	skbinfo = vmalloc(sizeof(*dd->ipath_port0_skbinfo) * egrcnt);
	if (skbinfo == NULL) {
		ipath_dev_err(dd, "allocation error for eager TID "
			      "skb array\n");
		ret = -ENOMEM;
		goto bail;
	}
	for (e = 0; e < egrcnt; e++) {
		/*
		 * This is a bit tricky in that we allocate extra
		 * space for 2 bytes of the 14 byte ethernet header.
		 * These two bytes are passed in the ipath header so
		 * the rest of the data is word aligned.  We allocate
		 * 4 bytes so that the data buffer stays word aligned.
		 * See ipath_kreceive() for more details.
		 */
		skbinfo[e].skb = ipath_alloc_skb(dd, GFP_KERNEL);
		if (!skbinfo[e].skb) {
			ipath_dev_err(dd, "SKB allocation error for "
				      "eager TID %u\n", e);
			while (e != 0)
				dev_kfree_skb(skbinfo[--e].skb);
			vfree(skbinfo);
			ret = -ENOMEM;
			goto bail;
		}
	}
	/*
	 * After loop above, so we can test non-NULL to see if ready
	 * to use at receive, etc.
	 */
	dd->ipath_port0_skbinfo = skbinfo;

	for (e = 0; e < egrcnt; e++) {
		dd->ipath_port0_skbinfo[e].phys =
		  ipath_map_single(dd->pcidev,
				   dd->ipath_port0_skbinfo[e].skb->data,
				   dd->ipath_ibmaxlen, PCI_DMA_FROMDEVICE);
		dd->ipath_f_put_tid(dd, e + (u64 __iomem *)
				    ((char __iomem *) dd->ipath_kregbase +
				     dd->ipath_rcvegrbase),
				    RCVHQ_RCV_TYPE_EAGER,
				    dd->ipath_port0_skbinfo[e].phys);
	}

	ret = 0;

bail:
	return ret;
}

static int bringup_link(struct ipath_devdata *dd)
{
	u64 val, ibc;
	int ret = 0;

	/* hold IBC in reset */
	dd->ipath_control &= ~INFINIPATH_C_LINKENABLE;
	ipath_write_kreg(dd, dd->ipath_kregs->kr_control,
			 dd->ipath_control);

	/*
	 * set initial max size pkt IBC will send, including ICRC; it's the
	 * PIO buffer size in dwords, less 1; also see ipath_set_mtu()
	 */
	val = (dd->ipath_ibmaxlen >> 2) + 1;
	ibc = val << dd->ibcc_mpl_shift;

	/* flowcontrolwatermark is in units of KBytes */
	ibc |=<