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

[Pucha, HimasekharX Reddy]

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces at osuosl.org> On Behalf Of Ricky Wu
> Sent: Thursday, May 30, 2024 7:52 PM
> To: Brandeburg, Jesse <jesse.brandeburg at intel.com>
> Cc: pmenzel at molgen.mpg.de; michal.swiatkowski at linux.intel.com; Drewek, Wojciech <wojciech.drewek at intel.com>; intel-wired-lan at lists.osuosl.org; rickywu0421 at gmail.com; linux-kernel at vger.kernel.org; en-wei.wu at canonical.com; edumazet at google.com; Lien, Cyrus > <cyrus.lien at canonical.com>; Nguyen, Anthony L <anthony.l.nguyen at intel.com>; netdev at vger.kernel.org; kuba at kernel.org; pabeni at redhat.com; davem at davemloft.net
> Subject: [Intel-wired-lan] [PATCH net, v2] ice: avoid IRQ collision to fix init failure on ACPI S3 resume
>
> 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 at canonical.com>
> Signed-off-by: Ricky Wu <en-wei.wu at 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(-)
>

Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha at intel.com> (A Contingent worker at Intel)