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

/*
 * Copyright (c) 2006 QLogic, Inc. 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/vmalloc.h>

#include "ipath_kernel.h"
#include "ips_common.h"

/*
 * min buffers we want to have per port, after driver
 */
#define IPATH_MIN_USER_PORT_BUFCNT 8

/*
 * 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 (layered drivers and SMA
 * send).  Reserved at end of buffer list.   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.  So the default value is not
 * very useful.  I've redefined it for the 1.3 release so that it's
 * zero unless set by the user to something else, in which case we
 * try to respect it.
 */
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 SMA
 * 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 sk_buff **skbs;
	int ret;

	egrcnt = dd->ipath_rcvegrcnt;

	skbs = vmalloc(sizeof(*dd->ipath_port0_skbs) * egrcnt);
	if (skbs == 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.
		 */
		skbs[e] = ipath_alloc_skb(dd, GFP_KERNEL);
		if (!skbs[e]) {
			ipath_dev_err(dd, "SKB allocation error for "
				      "eager TID %u\n", e);
			while (e != 0)
				dev_kfree_skb(skbs[--e]);
			vfree(skbs);
			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_skbs = skbs;

	for (e = 0; e < egrcnt; e++) {
		unsigned long phys =
			virt_to_phys(dd->ipath_port0_skbs[e]->data);
		dd->ipath_f_put_tid(dd, e + (u64 __iomem *)
				    ((char __iomem *) dd->ipath_kregbase +
				     dd->ipath_rcvegrbase), 0, 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);

	/*
	 * Note that prior to try 14 or 15 of IB, the credit scaling
	 * wasn't working, because it was swapped for writes with the
	 * 1 bit default linkstate field
	 */

	/* ignore pbc and align word */
	val = dd->ipath_piosize2k - 2 * sizeof(u32);
	/*
	 * for ICRC, which we only send in diag test pkt mode, and we
	 * don't need to worry about that for mtu
	 */
	val += 1;
	/*
	 * Set the IBC maxpktlength to the size of our pio buffers the
	 * maxpktlength is in words.  This is *not* the IB data MTU.
	 */
	ibc = (val / sizeof(u32)) << INFINIPATH_IBCC_MAXPKTLEN_SHIFT;
	/* in KB */
	ibc |= 0x5ULL << INFINIPATH_IBCC_FLOWCTRLWATERMARK_SHIFT;
	/*
	 * How often flowctrl sent.  More or less in usecs; balance against
	 * watermark value, so that in theory senders always get a flow
	 * control update in time to not let the IB link go idle.
	 */
	ibc |= 0x3ULL << INFINIPATH_IBCC_FLOWCTRLPERIOD_SHIFT;
	/* max error tolerance */
	ibc |= 0xfULL << INFINIPATH_IBCC_PHYERRTHRESHOLD_SHIFT;
	/* use "real" buffer space for */
	ibc |= 4ULL << INFINIPATH_IBCC_CREDITSCALE_SHIFT;
	/* IB credit flow control. */
	ibc |= 0xfULL << INFINIPATH_IBCC_OVERRUNTHRESHOLD_SHIFT;
	/* initially come up waiting for TS1, without sending anything. */
	dd->ipath_ibcctrl = ibc;
	/*
	 * Want to start out with both LINKCMD and LINKINITCMD in NOP
	 * (0 and 0).  Don't put linkinitcmd in ipath_ibcctrl, want that
	 * to stay a NOP
	 */
	ibc |= INFINIPATH_IBCC_LINKINITCMD_DISABLE <<
		INFINIPATH_IBCC_LINKINITCMD_SHIFT;
	ipath_cdbg(VERBOSE, "Writing 0x%llx to ibcctrl\n",
		   (unsigned long long) ibc);
	ipath_write_kreg(dd, dd->ipath_kregs