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e1000e: default IntMode based on kernel config & available hardware support

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Based on a patch from Prabhakar Kushwaha <prabhakar@freescale.com>, set
appropriate default interrupt mode dependent on whether CONFIG_PCI_MSI
is enabled in the kernel configuration and if the hardware supports
MSI-X.  Set the module parameter log message accordingly.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Cc: Jin Qing <b24347@freescale.com>
Cc: Prabhakar Kushwaha <prabhakar@freescale.com>
Cc: Jin Qing <b24347@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Bruce Allan 2011-12-16 00:45:56 +00:00 committed by Jeff Kirsher
parent 508da4264a
commit b6fbca2af3
1 changed files with 41 additions and 7 deletions
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48
drivers/net/ethernet/intel/e1000e/param.c
View file

@ -113,11 +113,20 @@ E1000_PARAM(InterruptThrottleRate, "Interrupt Throttling Rate");
#define MAX_ITR 100000
#define MIN_ITR 100
/* IntMode (Interrupt Mode)
/*
* IntMode (Interrupt Mode)
*
* Valid Range: 0 - 2
* Valid Range: varies depending on kernel configuration & hardware support
*
* Default Value: 2 (MSI-X)
* legacy=0, MSI=1, MSI-X=2
*
* When MSI/MSI-X support is enabled in kernel-
* Default Value: 2 (MSI-X) when supported by hardware, 1 (MSI) otherwise
* When MSI/MSI-X support is not enabled in kernel-
* Default Value: 0 (legacy)
*
* When a mode is specified that is not allowed/supported, it will be
* demoted to the most advanced interrupt mode available.
*/
E1000_PARAM(IntMode, "Interrupt Mode");
#define MAX_INTMODE 2
@ -388,12 +397,33 @@ void __devinit e1000e_check_options(struct e1000_adapter *adapter)
static struct e1000_option opt = {
.type = range_option,
.name = "Interrupt Mode",
.err = "defaulting to 2 (MSI-X)",
.def = E1000E_INT_MODE_MSIX,
.arg = { .r = { .min = MIN_INTMODE,
.max = MAX_INTMODE } }
#ifndef CONFIG_PCI_MSI
.err = "defaulting to 0 (legacy)",
.def = E1000E_INT_MODE_LEGACY,
.arg = { .r = { .min = 0,
.max = 0 } }
#endif
};
#ifdef CONFIG_PCI_MSI
if (adapter->flags & FLAG_HAS_MSIX) {
opt.err = kstrdup("defaulting to 2 (MSI-X)",
GFP_KERNEL);
opt.def = E1000E_INT_MODE_MSIX;
opt.arg.r.max = E1000E_INT_MODE_MSIX;
} else {
opt.err = kstrdup("defaulting to 1 (MSI)", GFP_KERNEL);
opt.def = E1000E_INT_MODE_MSI;
opt.arg.r.max = E1000E_INT_MODE_MSI;
}
if (!opt.err) {
dev_err(&adapter->pdev->dev,
"Failed to allocate memory\n");
return;
}
#endif
if (num_IntMode > bd) {
unsigned int int_mode = IntMode[bd];
e1000_validate_option(&int_mode, &opt, adapter);
@ -401,6 +431,10 @@ void __devinit e1000e_check_options(struct e1000_adapter *adapter)
} else {
adapter->int_mode = opt.def;
}
#ifdef CONFIG_PCI_MSI
kfree(opt.err);
#endif
}
{ /* Smart Power Down */
static const struct e1000_option opt = {