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IB/ipath: Fix calculation for number of kernel PIO buffers

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If the module parameter "kpiobufs" is set too high, the calculation to
reset it to a sane value was incorrect.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Bryan O'Sullivan 2007-03-15 14:45:02 -07:00 committed by Roland Dreier
parent c8c6f5d496
commit 0ed3c594e3
1 changed files with 16 additions and 21 deletions
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37
drivers/infiniband/hw/ipath/ipath_init_chip.c
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@ -668,6 +668,7 @@ int ipath_init_chip(struct ipath_devdata *dd, int reinit)
{
int ret = 0, i;
u32 val32, kpiobufs;
u32 piobufs, uports;
u64 val;
struct ipath_portdata *pd = NULL; /* keep gcc4 happy */
gfp_t gfp_flags = GFP_USER | __GFP_COMP;
@ -702,16 +703,17 @@ int ipath_init_chip(struct ipath_devdata *dd, int reinit)
* the in memory DMA'ed copies of the registers. This has to
* be done early, before we calculate lastport, etc.
*/
val = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k;
piobufs = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k;
/*
* calc number of pioavail registers, and save it; we have 2
* bits per buffer.
*/
dd->ipath_pioavregs = ALIGN(val, sizeof(u64) * BITS_PER_BYTE / 2)
dd->ipath_pioavregs = ALIGN(piobufs, sizeof(u64) * BITS_PER_BYTE / 2)
/ (sizeof(u64) * BITS_PER_BYTE / 2);
uports = dd->ipath_cfgports ? dd->ipath_cfgports - 1 : 0;
if (ipath_kpiobufs == 0) {
/* not set by user (this is default) */
if ((dd->ipath_piobcnt2k + dd->ipath_piobcnt4k) > 128)
if (piobufs >= (uports * IPATH_MIN_USER_PORT_BUFCNT) + 32)
kpiobufs = 32;
else
kpiobufs = 16;
@ -719,31 +721,25 @@ int ipath_init_chip(struct ipath_devdata *dd, int reinit)
else
kpiobufs = ipath_kpiobufs;
if (kpiobufs >
(dd->ipath_piobcnt2k + dd->ipath_piobcnt4k -
(dd->ipath_cfgports * IPATH_MIN_USER_PORT_BUFCNT))) {
i = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k -
(dd->ipath_cfgports * IPATH_MIN_USER_PORT_BUFCNT);
if (kpiobufs + (uports * IPATH_MIN_USER_PORT_BUFCNT) > piobufs) {
i = (int) piobufs -
(int) (uports * IPATH_MIN_USER_PORT_BUFCNT);
if (i < 0)
i = 0;
dev_info(&dd->pcidev->dev, "Allocating %d PIO bufs for "
"kernel leaves too few for %d user ports "
dev_info(&dd->pcidev->dev, "Allocating %d PIO bufs of "
"%d for kernel leaves too few for %d user ports "
"(%d each); using %u\n", kpiobufs,
dd->ipath_cfgports - 1,
IPATH_MIN_USER_PORT_BUFCNT, i);
piobufs, uports, IPATH_MIN_USER_PORT_BUFCNT, i);
/*
* shouldn't change ipath_kpiobufs, because could be
* different for different devices...
*/
kpiobufs = i;
}
dd->ipath_lastport_piobuf =
dd->ipath_piobcnt2k + dd->ipath_piobcnt4k - kpiobufs;
dd->ipath_pbufsport = dd->ipath_cfgports > 1
? dd->ipath_lastport_piobuf / (dd->ipath_cfgports - 1)
: 0;
val32 = dd->ipath_lastport_piobuf -
(dd->ipath_pbufsport * (dd->ipath_cfgports - 1));
dd->ipath_lastport_piobuf = piobufs - kpiobufs;
dd->ipath_pbufsport =
uports ? dd->ipath_lastport_piobuf / uports : 0;
val32 = dd->ipath_lastport_piobuf - (dd->ipath_pbufsport * uports);
if (val32 > 0) {
ipath_dbg("allocating %u pbufs/port leaves %u unused, "
"add to kernel\n", dd->ipath_pbufsport, val32);
@ -754,8 +750,7 @@ int ipath_init_chip(struct ipath_devdata *dd, int reinit)
dd->ipath_lastpioindex = dd->ipath_lastport_piobuf;
ipath_cdbg(VERBOSE, "%d PIO bufs for kernel out of %d total %u "
"each for %u user ports\n", kpiobufs,
dd->ipath_piobcnt2k + dd->ipath_piobcnt4k,
dd->ipath_pbufsport, dd->ipath_cfgports - 1);
piobufs, dd->ipath_pbufsport, uports);
dd->ipath_f_early_init(dd);