Re: [PATCHv4 0/5] nvme-fc: FPIN link integrity handling

[Muneendra Kumar M <muneendra.kumar@broadcom.com>]

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Hi Hannes,
Thanks for the patch .
We have tested this patch and this is working as designed.
This functionality is a crucial enhancement for Fibre Channel solutions.
This feature perpetuates the capabilities available in dm for NVMe in
previous releases.
With this patch we have a solution for
https://lore.kernel.org/linux-nvme/20250506153507.83094-1-hare@kernel.org/
#r for both SCSI and NVMe.”

Tested-by: Muneendra Kumar <muneendra.kumar@broadcom.com>


Regards,
Muneendra.



>>From: Hannes Reinecke <hare@kernel.org>
>>To: Christoph Hellwig <hch@lst.de>
>>Cc: Keith Busch <kbusch@kernel.org>, Sagi Grimberg <sagi@grimberg.me>,
>>	linux-nvme@lists.infradead.org, Hannes Reinecke <hare@kernel.org>
>>Subject: [PATCHv4 0/5] nvme-fc: FPIN link integrity handling
>>Date: Tue,  6 May 2025 17:35:02 +0200	[thread overview]
>>Message-ID: <20250506153507.83094-1-hare@kernel.org> (raw)
>>
>>FPIN LI (link integrity) messages are received when the attached
>>fabric detects hardware errors. In response to these messages I/O
>>should be directed away from the affected ports, and only used
>>if the 'optimized' paths are unavailable.
>>Upon port reset the paths should be put back in service as the
>>affected hardware might have been replaced.
>>This patch adds a new controller flag 'NVME_CTRL_MARGINAL'
>>which will be checked during multipath path selection, causing the
>>path to be skipped when checking for 'optimized' paths. If no
>>optimized paths are available the 'marginal' paths are considered
>>for path selection alongside the 'non-optimized' paths.
>>It also introduces a new nvme-fc callback 'nvme_fc_fpin_rcv()' to
>>evaluate the FPIN LI TLV payload and set the 'marginal' state on
>>all affected rports.
>>
>>Changes to the original submission:
>>- Changed flag name to 'marginal'
>>- Do not block marginal path; influence path selection instead
>>  to de-prioritize marginal paths
>>
>>Changes to v2:
>>- Split off driver-specific modifications
>>- Introduce 'union fc_tlv_desc' to avoid casts
>>
>>Changes to v3:
>>- Include reviews from Justin Tee
>>- Split marginal path handling patch
>>
>>Hannes Reinecke (5):
>>  fc_els: use 'union fc_tlv_desc'
>>  nvme-fc: marginal path handling
>>  nvme-fc: nvme_fc_fpin_rcv() callback
>>  lpfc: enable FPIN notification for NVMe
>>  qla2xxx: enable FPIN notification for NVMe
>>
>> drivers/nvme/host/core.c         |   1 +
>> drivers/nvme/host/fc.c           |  99 +++++++++++++++++++
>> drivers/nvme/host/multipath.c    |  17 ++--
>> drivers/nvme/host/nvme.h         |   6 ++
>> drivers/scsi/lpfc/lpfc_els.c     |  84 ++++++++--------
>> drivers/scsi/qla2xxx/qla_isr.c   |   3 +
>> drivers/scsi/scsi_transport_fc.c |  27 +++--
>> include/linux/nvme-fc-driver.h   |   3 +
>> include/uapi/scsi/fc/fc_els.h    | 165 +++++++++++++++++--------------
>> 9 files changed, 266 insertions(+), 139 deletions(-)
>>
>>--
>>2.35.3

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