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tg3: Fix single-vector MSI-X code

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Kdump kernels leave MSI-X interrupts (as setup by the crashed kernel)
enabled.  However, kdump only enables one CPU in the new environment,
thus causing tg3 to abort MSI-X setup.  When the driver attempts to
enable INTA or MSI interrupt modes on a kdump kernel, interrupt
delivery fails.

This patch attempts to workaround the problem by forcing the driver
to enable a single MSI-X interrupt.  In such a configuration, the
device's multivector interrupt mode must be disabled.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matt Carlson 2012-01-17 15:27:23 +00:00 committed by David S. Miller
parent 77676fdbd5
commit c3b5003b62
1 changed files with 14 additions and 13 deletions
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25
drivers/net/ethernet/broadcom/tg3.c
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@ -8846,9 +8846,11 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
tw32_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl);
udelay(100);
if (tg3_flag(tp, USING_MSIX) && tp->irq_cnt > 1) {
if (tg3_flag(tp, USING_MSIX)) {
val = tr32(MSGINT_MODE);
val |= MSGINT_MODE_MULTIVEC_EN | MSGINT_MODE_ENABLE;
val |= MSGINT_MODE_ENABLE;
if (tp->irq_cnt > 1)
val |= MSGINT_MODE_MULTIVEC_EN;
if (!tg3_flag(tp, 1SHOT_MSI))
val |= MSGINT_MODE_ONE_SHOT_DISABLE;
tw32(MSGINT_MODE, val);
@ -9548,19 +9550,18 @@ static int tg3_request_firmware(struct tg3 *tp)
static bool tg3_enable_msix(struct tg3 *tp)
{
int i, rc, cpus = num_online_cpus();
int i, rc;
struct msix_entry msix_ent[tp->irq_max];
if (cpus == 1)
/* Just fallback to the simpler MSI mode. */
return false;
/*
* We want as many rx rings enabled as there are cpus.
* The first MSIX vector only deals with link interrupts, etc,
* so we add one to the number of vectors we are requesting.
tp->irq_cnt = num_online_cpus();
if (tp->irq_cnt > 1) {
/* We want as many rx rings enabled as there are cpus.
* In multiqueue MSI-X mode, the first MSI-X vector
* only deals with link interrupts, etc, so we add
* one to the number of vectors we are requesting.
*/
tp->irq_cnt = min_t(unsigned, cpus + 1, tp->irq_max);
tp->irq_cnt = min_t(unsigned, tp->irq_cnt + 1, tp->irq_max);
}
for (i = 0; i < tp->irq_max; i++) {
msix_ent[i].entry = i;