[PATCH] nvme-fabrics: check max outstanding commands

[Guixin Liu]

> And please run blktests with it. Last time, we had some fallouts when a
> new check was added. Thanks.

I am sorry for the last time's mistake, I've already run the blktests 
this time,

the maxcmd is mandatory for all controllers.

Best Regards,

Guixin Liu


Blktests log:

nvme/002 (create many subsystems and test discovery)         [passed]
     runtime  16.481s  ...  16.716s
nvme/003 (test if we're sending keep-alives to a discovery controller) 
[passed]
     runtime  11.130s  ...  11.160s
nvme/004 (test nvme and nvmet UUID NS descriptors) [passed]
     runtime  0.535s  ...  0.615s
nvme/005 (reset local loopback target) [passed]
     runtime  0.969s  ...  0.973s
nvme/006 (create an NVMeOF target with a block device-backed ns) [passed]
     runtime  0.046s  ...  0.046s
nvme/007 (create an NVMeOF target with a file-backed ns) [passed]
     runtime  0.029s  ...  0.028s
nvme/008 (create an NVMeOF host with a block device-backed ns) [passed]
     runtime  0.540s  ...  0.519s
nvme/009 (create an NVMeOF host with a file-backed ns) [passed]
     runtime  0.539s  ...  0.536s
nvme/010 (run data verification fio job on NVMeOF block device-backed 
ns) [passed]
     runtime  3.388s  ...  3.356s
nvme/011 (run data verification fio job on NVMeOF file-backed ns) [passed]
     runtime  259.255s  ...  265.053s
nvme/012 (run mkfs and data verification fio job on NVMeOF block 
device-backed ns) [passed]
     runtime  11.734s  ...  11.623s
nvme/013 (run mkfs and data verification fio job on NVMeOF file-backed 
ns) [passed]
     runtime  228.180s  ...  231.981s
nvme/014 (flush a NVMeOF block device-backed ns) [passed]
     runtime  12.468s  ...  14.417s
nvme/015 (unit test for NVMe flush for file backed ns) [passed]
     runtime  11.854s  ...  11.849s
nvme/016 (create/delete many NVMeOF block device-backed ns and test 
discovery) [passed]
     runtime  8.017s  ...  8.201s
nvme/017 (create/delete many file-ns and test discovery) [passed]
     runtime  8.419s  ...  8.596s
nvme/018 (unit test NVMe-oF out of range access on a file backend) [passed]
     runtime  0.511s  ...  0.529s
nvme/019 (test NVMe DSM Discard command on NVMeOF block-device ns) [passed]
     runtime  0.535s  ...  0.547s
nvme/020 (test NVMe DSM Discard command on NVMeOF file-backed ns) [passed]
     runtime  0.529s  ...  0.526s
nvme/021 (test NVMe list command on NVMeOF file-backed ns) [passed]
     runtime  0.529s  ...  0.525s
nvme/022 (test NVMe reset command on NVMeOF file-backed ns) [passed]
     runtime  0.949s  ...  0.951s
nvme/023 (test NVMe smart-log command on NVMeOF block-device ns) [passed]
     runtime  0.527s  ...  0.557s
nvme/024 (test NVMe smart-log command on NVMeOF file-backed ns) [passed]
     runtime  0.526s  ...  0.523s
nvme/025 (test NVMe effects-log command on NVMeOF file-backed ns) [passed]
     runtime  0.539s  ...  0.526s
nvme/026 (test NVMe ns-descs command on NVMeOF file-backed ns) [passed]
     runtime  0.531s  ...  0.544s
nvme/027 (test NVMe ns-rescan command on NVMeOF file-backed ns) [passed]
     runtime  0.529s  ...  0.512s
nvme/028 (test NVMe list-subsys command on NVMeOF file-backed ns) [passed]
     runtime  0.520s  ...  0.523s
nvme/029 (test userspace IO via nvme-cli read/write interface) [passed]
     runtime  0.600s  ...  0.595s
nvme/030 (ensure the discovery generation counter is updated 
appropriately) [passed]
     runtime  0.183s  ...  0.160s
nvme/031 (test deletion of NVMeOF controllers immediately after setup) 
[passed]
     runtime  5.149s  ...  4.988s
nvme/038 (test deletion of NVMeOF subsystem without enabling) [passed]
     runtime  0.006s  ...  0.006s
nvme/040 (test nvme fabrics controller reset/disconnect operation during 
I/O) [passed]
     runtime  7.054s  ...  7.077s
nvme/041 (Create authenticated connections)                  [not run]
     kernel 6.8.0-rc5+ config not found
     kernel 6.8.0-rc5+ config not found
nvme/042 (Test dhchap key types for authenticated connections) [not run]
     kernel 6.8.0-rc5+ config not found
     kernel 6.8.0-rc5+ config not found
nvme/043 (Test hash and DH group variations for authenticated 
connections) [not run]
     kernel 6.8.0-rc5+ config not found
     kernel 6.8.0-rc5+ config not found
nvme/044 (Test bi-directional authentication)                [not run]
     kernel 6.8.0-rc5+ config not found
     kernel 6.8.0-rc5+ config not found
nvme/045 (Test re-authentication)                            [not run]
     kernel 6.8.0-rc5+ config not found
     kernel 6.8.0-rc5+ config not found
nvme/047 (test different queue types for fabric transports)  [not run]
     runtime  2.730s  ...
     nvme_trtype=loop is not supported in this test
nvme/048 (Test queue count changes on reconnect)             [not run]
     runtime  7.073s  ...
     nvme_trtype=loop is not supported in this test