[Intel-wired-lan] [PATCH net, v2] ice: avoid IRQ collision to fix init failure on ACPI S3 resume

[Ricky Wu <en-wei.wu@canonical.com>]

A bug in https://bugzilla.kernel.org/show_bug.cgi?id=218906 describes
that irdma would break and report hardware initialization failed after
suspend/resume with Intel E810 NIC (tested on 6.9.0-rc5).

The problem is caused due to the collision between the irq numbers
requested in irdma and the irq numbers requested in other drivers
after suspend/resume.

The irq numbers used by irdma are derived from ice's ice_pf->msix_entries
which stores mappings between MSI-X index and Linux interrupt number.
It's supposed to be cleaned up when suspend and rebuilt in resume but
it's not, causing irdma using the old irq numbers stored in the old
ice_pf->msix_entries to request_irq() when resume. And eventually
collide with other drivers.

This patch fixes this problem. On suspend, we call ice_deinit_rdma() to
clean up the ice_pf->msix_entries (and free the MSI-X vectors used by
irdma if we've dynamically allocated them). On resume, we call
ice_init_rdma() to rebuild the ice_pf->msix_entries (and allocate the
MSI-X vectors if we would like to dynamically allocate them).

Fixes: f9f5301e7e2d ("ice: Register auxiliary device to provide RDMA")
Tested-by: Cyrus Lien <cyrus.lien@canonical.com>
Signed-off-by: Ricky Wu <en-wei.wu@canonical.com>
---
Changes in v2:
- Change title
- Add Fixes and Tested-by tags
- Fix typo
---
 drivers/net/ethernet/intel/ice/ice_main.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index f60c022f7960..ec3cbadaa162 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -5544,7 +5544,7 @@ static int ice_suspend(struct device *dev)
 	 */
 	disabled = ice_service_task_stop(pf);
 
-	ice_unplug_aux_dev(pf);
+	ice_deinit_rdma(pf);
 
 	/* Already suspended?, then there is nothing to do */
 	if (test_and_set_bit(ICE_SUSPENDED, pf->state)) {
@@ -5624,6 +5624,10 @@ static int ice_resume(struct device *dev)
 	if (ret)
 		dev_err(dev, "Cannot restore interrupt scheme: %d\n", ret);
 
+	ret = ice_init_rdma(pf);
+	if (ret)
+		dev_err(dev, "Reinitialize RDMA during resume failed: %d\n", ret);
+
 	clear_bit(ICE_DOWN, pf->state);
 	/* Now perform PF reset and rebuild */
 	reset_type = ICE_RESET_PFR;
-- 
2.43.0