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IB/ipath: change handling of PIO buffers

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Different ipath hardware types have different numbers of buffers
available, so we decide on the counts ourselves unless we are specifically
overridden with a module parameter.

Signed-off-by: Bryan O'Sullivan <bos@pathscale.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Bryan O'Sullivan 2006-04-24 14:23:00 -07:00 committed by Roland Dreier
parent 23e86a4584
commit 52e7fad825
1 changed files with 22 additions and 14 deletions
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36
drivers/infiniband/hw/ipath/ipath_init_chip.c
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@ -53,13 +53,19 @@ 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.
* 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 = 32;
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_uint,
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");
@ -531,8 +537,11 @@ static int init_housekeeping(struct ipath_devdata *dd,
* Don't clear ipath_flags as 8bit mode was set before
* entering this func. However, we do set the linkstate to
* unknown, so we can watch for a transition.
* PRESENT is set because we want register reads to work,
* and the kernel infrastructure saw it in config space;
* We clear it if we have failures.
*/
dd->ipath_flags |= IPATH_LINKUNK;
dd->ipath_flags |= IPATH_LINKUNK | IPATH_PRESENT;
dd->ipath_flags &= ~(IPATH_LINKACTIVE | IPATH_LINKARMED |
IPATH_LINKDOWN | IPATH_LINKINIT);
@ -560,6 +569,7 @@ static int init_housekeeping(struct ipath_devdata *dd,
|| (dd->ipath_uregbase & 0xffffffff) == 0xffffffff) {
ipath_dev_err(dd, "Register read failures from chip, "
"giving up initialization\n");
dd->ipath_flags &= ~IPATH_PRESENT;
ret = -ENODEV;
goto done;
}
@ -682,16 +692,14 @@ int ipath_init_chip(struct ipath_devdata *dd, int reinit)
*/
dd->ipath_pioavregs = ALIGN(val, sizeof(u64) * BITS_PER_BYTE / 2)
/ (sizeof(u64) * BITS_PER_BYTE / 2);
if (!ipath_kpiobufs) /* have to have at least 1, for SMA */
kpiobufs = ipath_kpiobufs = 1;
else if ((dd->ipath_piobcnt2k + dd->ipath_piobcnt4k) <
(dd->ipath_cfgports * IPATH_MIN_USER_PORT_BUFCNT)) {
dev_info(&dd->pcidev->dev, "Too few PIO buffers (%u) "
"for %u ports to have %u each!\n",
dd->ipath_piobcnt2k + dd->ipath_piobcnt4k,
dd->ipath_cfgports, IPATH_MIN_USER_PORT_BUFCNT);
kpiobufs = 1; /* reserve just the minimum for SMA/ether */
} else
if (ipath_kpiobufs == 0) {
/* not set by user, or set explictly to default */
if ((dd->ipath_piobcnt2k + dd->ipath_piobcnt4k) > 128)
kpiobufs = 32;
else
kpiobufs = 16;
}
else
kpiobufs = ipath_kpiobufs;
if (kpiobufs >