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RDMA/irdma: Suppress PF reset on HMC error

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The irdma driver currently issues an unconditional PF reset whenever the
HMC Error interrupt (PFINT_OICR bit 26) fires:

	if (event->reg & IRDMAPFINT_OICR_HMC_ERR_M) {
		ibdev_err(&iwdev->ibdev, "HMC Error\n");
		iwdev->rf->reset = true;
	}

request_reset() issues an IIDC_PFR to ice. In practice a single HMC_ERR
can trigger cascading PF resets, IOMMU faults during teardown, and
teardown of every RDMA connection on the device.

i40e handles the identically-named interrupt by reading
PFHMC_ERRORINFO and PFHMC_ERRORDATA and logging them without touching
device state; see commit 9c010ee0ea ("i40e: Suppress HMC error to
Interrupt message level") which removed the reset as "not necessary".
This patch mirrors that handling on irdma.

With this change, repeated HMC_ERR no longer produces a reset storm and
RDMA traffic on the device continues uninterrupted.

Signed-off-by: Seyeong Kim <seyeong.kim@canonical.com>
Link: https://patch.msgid.link/20260619050044.1807044-1-seyeong.kim@canonical.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Seyeong Kim 2026-06-19 05:00:44 +00:00 • committed by Leon Romanovsky
commit 4dc9c884c0
5 changed files with 15 additions and 3 deletions
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