[PATCH v2 2/2] nvmet: return Invalid Field for invalid NSIDs in Get Features 82h

[Guixin Liu <kanie@linux.alibaba.com>]

The Reservation Notification Mask feature (FID 82h) rejects the same
NSIDs for Get Features as for Set Features, plus the broadcast NSID:

  "A Get Features command that uses a namespace ID of FFFFFFFFh
  shall be aborted with status code of Invalid Field in Command.
  If a Set Features command or a Get Features command attempts to
  access the Reservation Notification Mask on a namespace that does
  not support reservations or is invalid, then that command is
  aborted with status code of Invalid Field in Command."

  -- NVMe Base Specification, section 5.2.26.1.33

The Get Features handler routes the namespace lookup through
nvmet_req_find_ns(), which returns Invalid Namespace or Format for an
unknown NSID.  Both rejected cases land there: a nonexistent NSID
fails the lookup, and so does the broadcast NSID, which never names a
namespace.  Both are aborted with Invalid Namespace or Format instead
of Invalid Field in Command.

Translate the lookup failure to Invalid Field in Command, as was done
for Set Features.

Fixes: 5a47c2080a73 ("nvmet: support reservation feature")
Signed-off-by: Guixin Liu <kanie@linux.alibaba.com>
---
 drivers/nvme/target/pr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nvme/target/pr.c b/drivers/nvme/target/pr.c
index a36c732883d4..62ef8e85f7e9 100644
--- a/drivers/nvme/target/pr.c
+++ b/drivers/nvme/target/pr.c
@@ -77,6 +77,8 @@ u16 nvmet_get_feat_resv_notif_mask(struct nvmet_req *req)
 	u16 status;
 
 	status = nvmet_req_find_ns(req);
+	if (status == (NVME_SC_INVALID_NS | NVME_STATUS_DNR))
+		return NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
 	if (status)
 		return status;
 
-- 
2.43.7