drivers/infiniband/hw/ipath/ipath_stats.c - linux/kernel/git/davem/net-next - Git at Google

 /*
  * 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 "ipath_kernel.h"

 struct infinipath_stats ipath_stats;

 /**
  * ipath_snap_cntr - snapshot a chip counter
  * @dd: the infinipath device
  * @creg: the counter to snapshot
  *
  * called from add_timer and user counter read calls, to deal with
  * counters that wrap in "human time".  The words sent and received, and
  * the packets sent and received are all that we worry about.  For now,
  * at least, we don't worry about error counters, because if they wrap
  * that quickly, we probably don't care.  We may eventually just make this
  * handle all the counters.  word counters can wrap in about 20 seconds
  * of full bandwidth traffic, packet counters in a few hours.
  */

 u64 ipath_snap_cntr(struct ipath_devdata *dd, ipath_creg creg)
 {
 	u32 val, reg64 = 0;
 	u64 val64;
 	unsigned long t0, t1;
 	u64 ret;

 	t0 = jiffies;
 	/* If fast increment counters are only 32 bits, snapshot them,
 	 * and maintain them as 64bit values in the driver */
 	if (!(dd->ipath_flags & IPATH_32BITCOUNTERS) &&
 	    (creg == dd->ipath_cregs->cr_wordsendcnt ||
 	     creg == dd->ipath_cregs->cr_wordrcvcnt ||
 	     creg == dd->ipath_cregs->cr_pktsendcnt ||
 	     creg == dd->ipath_cregs->cr_pktrcvcnt)) {
 		val64 = ipath_read_creg(dd, creg);
 		val = val64 == ~0ULL ? ~0U : 0;
 		reg64 = 1;
 	} else			/* val64 just to keep gcc quiet... */
 		val64 = val = ipath_read_creg32(dd, creg);
 	/*
 	 * See if a second has passed.  This is just a way to detect things
 	 * that are quite broken.  Normally this should take just a few
 	 * cycles (the check is for long enough that we don't care if we get
 	 * pre-empted.)  An Opteron HT O read timeout is 4 seconds with
 	 * normal NB values
 	 */
 	t1 = jiffies;
 	if (time_before(t0 + HZ, t1) && val == -1) {
 		ipath_dev_err(dd, "Error!  Read counter 0x%x timed out\n",
 			      creg);
 		ret = 0ULL;
 		goto bail;
 	}
 	if (reg64) {
 		ret = val64;
 		goto bail;
 	}

 	if (creg == dd->ipath_cregs->cr_wordsendcnt) {
 		if (val != dd->ipath_lastsword) {
 			dd->ipath_sword += val - dd->ipath_lastsword;
 			dd->ipath_lastsword = val;
 		}
 		val64 = dd->ipath_sword;
 	} else if (creg == dd->ipath_cregs->cr_wordrcvcnt) {
 		if (val != dd->ipath_lastrword) {
 			dd->ipath_rword += val - dd->ipath_lastrword;
 			dd->ipath_lastrword = val;
 		}
 		val64 = dd->ipath_rword;
 	} else if (creg == dd->ipath_cregs->cr_pktsendcnt) {
 		if (val != dd->ipath_lastspkts) {
 			dd->ipath_spkts += val - dd->ipath_lastspkts;
 			dd->ipath_lastspkts = val;
 		}
 		val64 = dd->ipath_spkts;
 	} else if (creg == dd->ipath_cregs->cr_pktrcvcnt) {
 		if (val != dd->ipath_lastrpkts) {
 			dd->ipath_rpkts += val - dd->ipath_lastrpkts;
 			dd->ipath_lastrpkts = val;
 		}
 		val64 = dd->ipath_rpkts;
 	} else
 		val64 = (u64) val;

 	ret = val64;

 bail:
 	return ret;
 }

 /**
  * ipath_qcheck - print delta of egrfull/hdrqfull errors for kernel ports
  * @dd: the infinipath device
  *
  * print the delta of egrfull/hdrqfull errors for kernel ports no more than
  * every 5 seconds.  User processes are printed at close, but kernel doesn't
  * close, so...  Separate routine so may call from other places someday, and
  * so function name when printed by _IPATH_INFO is meaningfull
  */
 static void ipath_qcheck(struct ipath_devdata *dd)
 {
 	static u64 last_tot_hdrqfull;
 	size_t blen = 0;
 	char buf[128];

 	*buf = 0;
 	if (dd->ipath_pd[0]->port_hdrqfull != dd->ipath_p0_hdrqfull) {
 		blen = snprintf(buf, sizeof buf, "port 0 hdrqfull %u",
 				dd->ipath_pd[0]->port_hdrqfull -
 				dd->ipath_p0_hdrqfull);
 		dd->ipath_p0_hdrqfull = dd->ipath_pd[0]->port_hdrqfull;
 	}
 	if (ipath_stats.sps_etidfull != dd->ipath_last_tidfull) {
 		blen += snprintf(buf + blen, sizeof buf - blen,
 				 "%srcvegrfull %llu",
 				 blen ? ", " : "",
 				 (unsigned long long)
 				 (ipath_stats.sps_etidfull -
 				  dd->ipath_last_tidfull));
 		dd->ipath_last_tidfull = ipath_stats.sps_etidfull;
 	}

 	/*
 	 * this is actually the number of hdrq full interrupts, not actual
 	 * events, but at the moment that's mostly what I'm interested in.
 	 * Actual count, etc. is in the counters, if needed.  For production
 	 * users this won't ordinarily be printed.
 	 */

 	if ((ipath_debug & (__IPATH_PKTDBG | __IPATH_DBG)) &&
 	    ipath_stats.sps_hdrqfull != last_tot_hdrqfull) {
 		blen += snprintf(buf + blen, sizeof buf - blen,
 				 "%shdrqfull %llu (all ports)",
 				 blen ? ", " : "",
 				 (unsigned long long)
 				 (ipath_stats.sps_hdrqfull -
 				  last_tot_hdrqfull));
 		last_tot_hdrqfull = ipath_stats.sps_hdrqfull;
 	}
 	if (blen)
 		ipath_dbg("%s\n", buf);

 	if (dd->ipath_port0head != (u32)
 	    le64_to_cpu(*dd->ipath_hdrqtailptr)) {
 		if (dd->ipath_lastport0rcv_cnt ==
 		    ipath_stats.sps_port0pkts) {
 			ipath_cdbg(PKT, "missing rcv interrupts? "
 				   "port0 hd=%llx tl=%x; port0pkts %llx\n",
 				   (unsigned long long)
 				   le64_to_cpu(*dd->ipath_hdrqtailptr),
 				   dd->ipath_port0head,
 				   (unsigned long long)
 				   ipath_stats.sps_port0pkts);
 			ipath_kreceive(dd);
 		}
 		dd->ipath_lastport0rcv_cnt = ipath_stats.sps_port0pkts;
 	}
 }

 /**
  * ipath_get_faststats - get word counters from chip before they overflow
  * @opaque - contains a pointer to the infinipath device ipath_devdata
  *
  * called from add_timer
  */
 void ipath_get_faststats(unsigned long opaque)
 {
 	struct ipath_devdata *dd = (struct ipath_devdata *) opaque;
 	u32 val;
 	static unsigned cnt;

 	/*
 	 * don't access the chip while running diags, or memory diags can
 	 * fail
 	 */
 	if (!dd->ipath_kregbase || !(dd->ipath_flags & IPATH_PRESENT) ||
 	    ipath_diag_inuse)
 		/* but re-arm the timer, for diags case; won't hurt other */
 		goto done;

 	if (dd->ipath_flags & IPATH_32BITCOUNTERS) {
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordsendcnt);
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordrcvcnt);
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktsendcnt);
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktrcvcnt);
 	}

 	ipath_qcheck(dd);

 	/*
 	 * deal with repeat error suppression.  Doesn't really matter if
 	 * last error was almost a full interval ago, or just a few usecs
 	 * ago; still won't get more than 2 per interval.  We may want
 	 * longer intervals for this eventually, could do with mod, counter
 	 * or separate timer.  Also see code in ipath_handle_errors() and
 	 * ipath_handle_hwerrors().
 	 */

 	if (dd->ipath_lasterror)
 		dd->ipath_lasterror = 0;
 	if (dd->ipath_lasthwerror)
 		dd->ipath_lasthwerror = 0;
 	if ((dd->ipath_maskederrs & ~dd->ipath_ignorederrs)
 	    && time_after(jiffies, dd->ipath_unmasktime)) {
 		char ebuf[256];
 		ipath_decode_err(ebuf, sizeof ebuf,
 				 (dd->ipath_maskederrs & ~dd->
 				  ipath_ignorederrs));
 		if ((dd->ipath_maskederrs & ~dd->ipath_ignorederrs) &
 		    ~(INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL))
 			ipath_dev_err(dd, "Re-enabling masked errors "
 				      "(%s)\n", ebuf);
 		else {
 			/*
 			 * rcvegrfull and rcvhdrqfull are "normal", for some
 			 * types of processes (mostly benchmarks) that send
 			 * huge numbers of messages, while not processing
 			 * them.  So only complain about these at debug
 			 * level.
 			 */
 			ipath_dbg("Disabling frequent queue full errors "
 				  "(%s)\n", ebuf);
 		}
 		dd->ipath_maskederrs = dd->ipath_ignorederrs;
 		ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
 				 ~dd->ipath_maskederrs);
 	}

 	/* limit qfull messages to ~one per minute per port */
 	if ((++cnt & 0x10)) {
 		for (val = dd->ipath_cfgports - 1; ((int)val) >= 0;
 		     val--) {
 			if (dd->ipath_lastegrheads[val] != -1)
 				dd->ipath_lastegrheads[val] = -1;
 			if (dd->ipath_lastrcvhdrqtails[val] != -1)
 				dd->ipath_lastrcvhdrqtails[val] = -1;
 		}
 	}

 	if (dd->ipath_nosma_bufs) {
 		dd->ipath_nosma_secs += 5;
 		if (dd->ipath_nosma_secs >= 30) {
 			ipath_cdbg(SMA, "No SMA bufs avail %u seconds; "
 				   "cancelling pending sends\n",
 				   dd->ipath_nosma_secs);
 			/*
 			 * issue an abort as well, in case we have a packet
 			 * stuck in launch fifo.  This could corrupt an
 			 * outgoing user packet in the worst case,
 			 * but this is a pretty catastrophic, anyway.
 			 */
 			ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
 					 INFINIPATH_S_ABORT);
 			ipath_disarm_piobufs(dd, dd->ipath_lastport_piobuf,
 					     dd->ipath_piobcnt2k +
 					     dd->ipath_piobcnt4k -
 					     dd->ipath_lastport_piobuf);
 			/* start again, if necessary */
 			dd->ipath_nosma_secs = 0;
 		} else
 			ipath_cdbg(SMA, "No SMA bufs avail %u tries, "
 				   "after %u seconds\n",
 				   dd->ipath_nosma_bufs,
 				   dd->ipath_nosma_secs);
 	}

 done:
 	mod_timer(&dd->ipath_stats_timer, jiffies + HZ * 5);
 }
	/*
	* 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 "ipath_kernel.h"

	struct infinipath_stats ipath_stats;

	/**
	* ipath_snap_cntr - snapshot a chip counter
	* @dd: the infinipath device
	* @creg: the counter to snapshot
	*
	* called from add_timer and user counter read calls, to deal with
	* counters that wrap in "human time". The words sent and received, and
	* the packets sent and received are all that we worry about. For now,
	* at least, we don't worry about error counters, because if they wrap
	* that quickly, we probably don't care. We may eventually just make this
	* handle all the counters. word counters can wrap in about 20 seconds
	* of full bandwidth traffic, packet counters in a few hours.
	*/

	u64 ipath_snap_cntr(struct ipath_devdata *dd, ipath_creg creg)
	{
	u32 val, reg64 = 0;
	u64 val64;
	unsigned long t0, t1;
	u64 ret;

	t0 = jiffies;
	/* If fast increment counters are only 32 bits, snapshot them,
	* and maintain them as 64bit values in the driver */
	if (!(dd->ipath_flags & IPATH_32BITCOUNTERS) &&
	(creg == dd->ipath_cregs->cr_wordsendcnt \|\|
	creg == dd->ipath_cregs->cr_wordrcvcnt \|\|
	creg == dd->ipath_cregs->cr_pktsendcnt \|\|
	creg == dd->ipath_cregs->cr_pktrcvcnt)) {
	val64 = ipath_read_creg(dd, creg);
	val = val64 == ~0ULL ? ~0U : 0;
	reg64 = 1;
	} else /* val64 just to keep gcc quiet... */
	val64 = val = ipath_read_creg32(dd, creg);
	/*
	* See if a second has passed. This is just a way to detect things
	* that are quite broken. Normally this should take just a few
	* cycles (the check is for long enough that we don't care if we get
	* pre-empted.) An Opteron HT O read timeout is 4 seconds with
	* normal NB values
	*/
	t1 = jiffies;
	if (time_before(t0 + HZ, t1) && val == -1) {
	ipath_dev_err(dd, "Error! Read counter 0x%x timed out\n",
	creg);
	ret = 0ULL;
	goto bail;
	}
	if (reg64) {
	ret = val64;
	goto bail;
	}

	if (creg == dd->ipath_cregs->cr_wordsendcnt) {
	if (val != dd->ipath_lastsword) {
	dd->ipath_sword += val - dd->ipath_lastsword;
	dd->ipath_lastsword = val;
	}
	val64 = dd->ipath_sword;
	} else if (creg == dd->ipath_cregs->cr_wordrcvcnt) {
	if (val != dd->ipath_lastrword) {
	dd->ipath_rword += val - dd->ipath_lastrword;
	dd->ipath_lastrword = val;
	}
	val64 = dd->ipath_rword;
	} else if (creg == dd->ipath_cregs->cr_pktsendcnt) {
	if (val != dd->ipath_lastspkts) {
	dd->ipath_spkts += val - dd->ipath_lastspkts;
	dd->ipath_lastspkts = val;
	}
	val64 = dd->ipath_spkts;
	} else if (creg == dd->ipath_cregs->cr_pktrcvcnt) {
	if (val != dd->ipath_lastrpkts) {
	dd->ipath_rpkts += val - dd->ipath_lastrpkts;
	dd->ipath_lastrpkts = val;
	}
	val64 = dd->ipath_rpkts;
	} else
	val64 = (u64) val;

	ret = val64;

	bail:
	return ret;
	}

	/**
	* ipath_qcheck - print delta of egrfull/hdrqfull errors for kernel ports
	* @dd: the infinipath device
	*
	* print the delta of egrfull/hdrqfull errors for kernel ports no more than
	* every 5 seconds. User processes are printed at close, but kernel doesn't
	* close, so... Separate routine so may call from other places someday, and
	* so function name when printed by _IPATH_INFO is meaningfull
	*/
	static void ipath_qcheck(struct ipath_devdata *dd)
	{
	static u64 last_tot_hdrqfull;
	size_t blen = 0;
	char buf[128];

	*buf = 0;
	if (dd->ipath_pd[0]->port_hdrqfull != dd->ipath_p0_hdrqfull) {
	blen = snprintf(buf, sizeof buf, "port 0 hdrqfull %u",
	dd->ipath_pd[0]->port_hdrqfull -
	dd->ipath_p0_hdrqfull);
	dd->ipath_p0_hdrqfull = dd->ipath_pd[0]->port_hdrqfull;
	}
	if (ipath_stats.sps_etidfull != dd->ipath_last_tidfull) {
	blen += snprintf(buf + blen, sizeof buf - blen,
	"%srcvegrfull %llu",
	blen ? ", " : "",
	(unsigned long long)
	(ipath_stats.sps_etidfull -
	dd->ipath_last_tidfull));
	dd->ipath_last_tidfull = ipath_stats.sps_etidfull;
	}

	/*
	* this is actually the number of hdrq full interrupts, not actual
	* events, but at the moment that's mostly what I'm interested in.
	* Actual count, etc. is in the counters, if needed. For production
	* users this won't ordinarily be printed.
	*/

	if ((ipath_debug & (__IPATH_PKTDBG \| __IPATH_DBG)) &&
	ipath_stats.sps_hdrqfull != last_tot_hdrqfull) {
	blen += snprintf(buf + blen, sizeof buf - blen,
	"%shdrqfull %llu (all ports)",
	blen ? ", " : "",
	(unsigned long long)
	(ipath_stats.sps_hdrqfull -
	last_tot_hdrqfull));
	last_tot_hdrqfull = ipath_stats.sps_hdrqfull;
	}
	if (blen)
	ipath_dbg("%s\n", buf);

	if (dd->ipath_port0head != (u32)
	le64_to_cpu(*dd->ipath_hdrqtailptr)) {
	if (dd->ipath_lastport0rcv_cnt ==
	ipath_stats.sps_port0pkts) {
	ipath_cdbg(PKT, "missing rcv interrupts? "
	"port0 hd=%llx tl=%x; port0pkts %llx\n",
	(unsigned long long)
	le64_to_cpu(*dd->ipath_hdrqtailptr),
	dd->ipath_port0head,
	(unsigned long long)
	ipath_stats.sps_port0pkts);
	ipath_kreceive(dd);
	}
	dd->ipath_lastport0rcv_cnt = ipath_stats.sps_port0pkts;
	}
	}

	/**
	* ipath_get_faststats - get word counters from chip before they overflow
	* @opaque - contains a pointer to the infinipath device ipath_devdata
	*
	* called from add_timer
	*/
	void ipath_get_faststats(unsigned long opaque)
	{
	struct ipath_devdata dd = (struct ipath_devdata ) opaque;
	u32 val;
	static unsigned cnt;

	/*
	* don't access the chip while running diags, or memory diags can
	* fail
	*/
	if (!dd->ipath_kregbase \|\| !(dd->ipath_flags & IPATH_PRESENT) \|\|
	ipath_diag_inuse)
	/* but re-arm the timer, for diags case; won't hurt other */
	goto done;

	if (dd->ipath_flags & IPATH_32BITCOUNTERS) {
	ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordsendcnt);
	ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordrcvcnt);
	ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktsendcnt);
	ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktrcvcnt);
	}

	ipath_qcheck(dd);

	/*
	* deal with repeat error suppression. Doesn't really matter if
	* last error was almost a full interval ago, or just a few usecs
	* ago; still won't get more than 2 per interval. We may want
	* longer intervals for this eventually, could do with mod, counter
	* or separate timer. Also see code in ipath_handle_errors() and
	* ipath_handle_hwerrors().
	*/

	if (dd->ipath_lasterror)
	dd->ipath_lasterror = 0;
	if (dd->ipath_lasthwerror)
	dd->ipath_lasthwerror = 0;
	if ((dd->ipath_maskederrs & ~dd->ipath_ignorederrs)
	&& time_after(jiffies, dd->ipath_unmasktime)) {
	char ebuf[256];
	ipath_decode_err(ebuf, sizeof ebuf,
	(dd->ipath_maskederrs & ~dd->
	ipath_ignorederrs));
	if ((dd->ipath_maskederrs & ~dd->ipath_ignorederrs) &
	~(INFINIPATH_E_RRCVEGRFULL \| INFINIPATH_E_RRCVHDRFULL))
	ipath_dev_err(dd, "Re-enabling masked errors "
	"(%s)\n", ebuf);
	else {
	/*
	* rcvegrfull and rcvhdrqfull are "normal", for some
	* types of processes (mostly benchmarks) that send
	* huge numbers of messages, while not processing
	* them. So only complain about these at debug
	* level.
	*/
	ipath_dbg("Disabling frequent queue full errors "
	"(%s)\n", ebuf);
	}
	dd->ipath_maskederrs = dd->ipath_ignorederrs;
	ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
	~dd->ipath_maskederrs);
	}

	/* limit qfull messages to ~one per minute per port */
	if ((++cnt & 0x10)) {
	for (val = dd->ipath_cfgports - 1; ((int)val) >= 0;
	val--) {
	if (dd->ipath_lastegrheads[val] != -1)
	dd->ipath_lastegrheads[val] = -1;
	if (dd->ipath_lastrcvhdrqtails[val] != -1)
	dd->ipath_lastrcvhdrqtails[val] = -1;
	}
	}

	if (dd->ipath_nosma_bufs) {
	dd->ipath_nosma_secs += 5;
	if (dd->ipath_nosma_secs >= 30) {
	ipath_cdbg(SMA, "No SMA bufs avail %u seconds; "
	"cancelling pending sends\n",
	dd->ipath_nosma_secs);
	/*
	* issue an abort as well, in case we have a packet
	* stuck in launch fifo. This could corrupt an
	* outgoing user packet in the worst case,
	* but this is a pretty catastrophic, anyway.
	*/
	ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
	INFINIPATH_S_ABORT);
	ipath_disarm_piobufs(dd, dd->ipath_lastport_piobuf,
	dd->ipath_piobcnt2k +
	dd->ipath_piobcnt4k -
	dd->ipath_lastport_piobuf);
	/* start again, if necessary */
	dd->ipath_nosma_secs = 0;
	} else
	ipath_cdbg(SMA, "No SMA bufs avail %u tries, "
	"after %u seconds\n",
	dd->ipath_nosma_bufs,
	dd->ipath_nosma_secs);
	}

	done:
	mod_timer(&dd->ipath_stats_timer, jiffies + HZ * 5);
	}