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# Switchtec-nvme-cli
This project is a fork of the [nvme-cli][0] project with additional support for using NVMe drives in the Switchtec Gen4 PAX fabric.

## Background
Switchtec Gen4 PAX is a variant of Microsemi's Switchtec PCIe switch product which enables sharing SR-IOV devices among multiple hosts. Common SR-IOV devices include NICs, HBAs, IB cards, etc. With the support of a Switchtec Gen4 PAX switch and this utility, an SR-IOV capable NVMe drive can be managed and configured by a host and then shared among multiple hosts.

By default, an NVMe drive in the PAX fabric cannot be enumerated by the host. Using the bind operation provided by the Switchtec Gen4 PAX switch, such a VF can be bound to and enumerated by the host.

Unlike some other SR-IOV devices such as NICs, NVMe drives need to be properly configured before they can be used. Generally, configuration includes creating a namespace, attaching the namespace to a specific VF (NVMe secondary controller), allocating VI and VQ resources for the VF, and bringing the VF online.

The configuration is done through Fabric Manager using MRPC commands. The MRPC interface is a way for a host to send configuration commands to the Switchtec firmware. Switchtec Gen4 PAX provides a special MRPC command to forward NVMe admin commands to the NVMe drives in the PAX fabric.

Switchtec-nvme-cli is responsible for creating the NVMe admin commands and delivering them to NVMe drives in the PAX fabric, using the special MRPC command. The special MRPC commands can be sent through one of these two channels: the inband PCIe channel, or the Ethernet channel. Switchtec-nvme-cli is currently based on v1.11.1 of the [nvme-cli][0].

Refer to the Switchtec PAX device specification for further information on Switchtec PAX, including MRPC, Fabric Manager and other terminologies used in this document.

## Features
Swichtec-nvme-cli supports all features of nvme-cli for drives connected directly to the host.

Swichtec-nvme-cli supports the following operations for NVMe drives behind PAX:
- Listing all NVMe devices and namespaces
- Creating a namespace
- Deleting a namespace
- Attaching a namespace to requested controller(s)
- Deleting a namespace from the controller
- Sending the NVMe Identify Controller command
- Sending the NVMe Identify Namespace command, displaying structure
- Sending the NVMe Identify List command, displaying structure
- Sending the Virtualization Management command
- Resetting a specific Virtual Function (VF)
- Downloading a firmware image
- Committing a firmware image
- Sending a user-defined Admin command
- Listing secondary controllers

## Building and Installation
Switchtec-nvme-cli has the following dependencies:
* libssl-dev
* [switchtec-user][1] library
* [switchtec-kernel][2] driver

Please build and install the switchtec-user library and switchtec-kernel driver before building this utility.

To build and install this utility, simply run the following commands:
```
#sudo make
#sudo make install
```

## Examples
Here are some sample commands for managing NVMe drives in a PAX fabric. For the NVMe drives connected directly to the host, all commands from the original nvme-cli are supported without any change.

### Fabric Manager over PCIe channel
1. List all NVMe devices and namespaces
```
#sudo ./switchtec-nvme switchtec list
Node                       SN                   Model                                    Namespace Usage                      Format           FW Rev
-------------------------- -------------------- ---------------------------------------- --------- -------------------------- ---------------- --------
0x3300@/dev/switchtec0   SERIALNUMBER         VENDOR MODEL                             1           6.55  MB /   6.55  MB    512   B +  0 B   REVISION
0x3300@/dev/switchtec0   SERIALNUMBER         VENDOR MODEL                             2          13.11  MB /  13.11  MB    512   B +  0 B   REVISION
0x3300@/dev/switchtec0   SERIALNUMBER         VENDOR MODEL                             3         131.07  MB / 131.07  MB    512   B +  0 B   REVISION
0x3300@/dev/switchtec0   SERIALNUMBER         VENDOR MODEL                             4           2.15  GB /   2.15  GB    512   B +  0 B   REVISION
0x3300@/dev/switchtec0   SERIALNUMBER         VENDOR MODEL                             5           2.15  GB /   2.15  GB    512   B +  0 B   REVISION

```
2. List controllers of an NVMe drive
```
#sudo ./switchtec-nvme list-ctrl 0x3300@/dev/switchtec0
[   0]:0x1
[   1]:0x2
[   2]:0x3
[   3]:0x4
[   4]:0x5
[   5]:0x6
[   6]:0x7
[   7]:0x8
[   8]:0x9
[   9]:0xa
[  10]:0xb
[  11]:0xc
[  12]:0xd
[  13]:0xe
[  14]:0xf
[  15]:0x21
```
3. List namespaces of an NVMe drive
```
#sudo ./switchtec-nvme list-ns 0x3300@/dev/switchtec0
[   0]:0x1
[   1]:0x2
[   2]:0x3
[   3]:0x4
[   4]:0x5
```
4. Create a 4GB namespace
```
#sudo ./switchtec-nvme  create-ns 0x3300@/dev/switchtec0 -c 1048576 -s 1048576 -f 2
create-ns: Success, created nsid:6
```
5. Attach a namespace to a controller
```
#sudo ./switchtec-nvme attach-ns 0x3300@/dev/switchtec0 -n 6 -c 1
attach-ns: Success, nsid:6
```
6. List all NVMe devices and namespaces
```
#sudo ./switchtec-nvme switchtec list
Node                       SN                   Model                                    Namespace Usage                      Format           FW Rev
-------------------------- -------------------- ---------------------------------------- --------- -------------------------- ---------------- --------
0x3300@/dev/switchtec0   SERIALNUMBER         VENDOR MODEL                             1           6.55  MB /   6.55  MB    512   B +  0 B   REVISION
0x3300@/dev/switchtec0   SERIALNUMBER         VENDOR MODEL                             2          13.11  MB /  13.11  MB    512   B +  0 B   REVISION
0x3300@/dev/switchtec0   SERIALNUMBER         VENDOR MODEL                             3         131.07  MB / 131.07  MB    512   B +  0 B   REVISION
0x3300@/dev/switchtec0   SERIALNUMBER         VENDOR MODEL                             4           2.15  GB /   2.15  GB    512   B +  0 B   REVISION
0x3300@/dev/switchtec0   SERIALNUMBER         VENDOR MODEL                             5           2.15  GB /   2.15  GB    512   B +  0 B   REVISION
0x3300@/dev/switchtec0   SERIALNUMBER         VENDOR MODEL                             6           4.29  GB /   4.29  GB      4 KiB +  0 B   REVISION
```
7. Allocate VQ and VI resources for the controller
```
#sudo ./switchtec-nvme virt-mgmt 0x3300@/dev/switchtec0 -c1 -r0 -a8 -n2
success, Number of Resources allocated:0x2
#sudo ./switchtec-nvme virt-mgmt 0x3300@/dev/switchtec0 -c1 -r1 -a8 -n2
success, Number of Resources allocated:0x2
```
8. Reset the controller and then bring it online (note that `0x3300` is the ID for the primary controller, and `0x3301` is for the secondary controller 1)
```
#sudo ./switchtec-nvme switchtec vf-reset 0x3301@/dev/switchtec0 -f
#sudo ./switchtec-nvme virt-mgmt 0x3300@/dev/switchtec0 -c1 -r1 -a9
success, Number of Resources allocated:0
```
9. Now you can bind the controller to a PAX device and start using the namespace resource

10. Bring the controller offline
```
#sudo ./switchtec-nvme virt-mgmt 0x3300@/dev/switchtec0 -c1 -r1 -a7
success, Number of Resources allocated:0
```
11. Detach a namespace from a controller
```
#sudo ./switchtec-nvme detach-ns 0x3300@/dev/switchtec0 -n 6 -c 0x21
detach-ns: Success, nsid:6
```
12. Delete a namespace
```
#sudo ./switchtec-nvme delete-ns 0x3300@/dev/switchtec0 -n 6
delete-ns: Success, deleted nsid:6
```
13. List all NVMe devices and namespaces
```
#sudo ./switchtec-nvme switchtec list
Node                       SN                   Model                                    Namespace Usage                      Format           FW Rev
-------------------------- -------------------- ---------------------------------------- --------- -------------------------- ---------------- --------
0x3300@/dev/switchtec0   SERIALNUMBER         VENDOR MODEL                             1           6.55  MB /   6.55  MB    512   B +  0 B   REVISION
0x3300@/dev/switchtec0   SERIALNUMBER         VENDOR MODEL                             2          13.11  MB /  13.11  MB    512   B +  0 B   REVISION
0x3300@/dev/switchtec0   SERIALNUMBER         VENDOR MODEL                             3         131.07  MB / 131.07  MB    512   B +  0 B   REVISION
0x3300@/dev/switchtec0   SERIALNUMBER         VENDOR MODEL                             4           2.15  GB /   2.15  GB    512   B +  0 B   REVISION
0x3300@/dev/switchtec0   SERIALNUMBER         VENDOR MODEL                             5           2.15  GB /   2.15  GB    512   B +  0 B   REVISION
```

### Fabric Manager over Ethernet channel
1. List all NVMe devices and namespaces
```
#sudo ./switchtec-nvme switchtec list -r 10.188.117.80:0
Node                       SN                   Model                                    Namespace Usage                      Format           FW Rev
-------------------------- -------------------- ---------------------------------------- --------- -------------------------- ---------------- --------
0x3300@10.188.117.80:0   SERIALNUMBER         VENDOR MODEL                             1           6.55  MB /   6.55  MB    512   B +  0 B   REVISION
0x3300@10.188.117.80:0   SERIALNUMBER         VENDOR MODEL                             2          13.11  MB /  13.11  MB    512   B +  0 B   REVISION
0x3300@10.188.117.80:0   SERIALNUMBER         VENDOR MODEL                             3         131.07  MB / 131.07  MB    512   B +  0 B   REVISION
0x3300@10.188.117.80:0   SERIALNUMBER         VENDOR MODEL                             4           2.15  GB /   2.15  GB    512   B +  0 B   REVISION
0x3300@10.188.117.80:0   SERIALNUMBER         VENDOR MODEL                             5           2.15  GB /   2.15  GB    512   B +  0 B   REVISION
```
2. List controllers of an NVMe drive
```
#sudo ./switchtec-nvme list-ctrl 0x3300@10.188.117.80:0
[   0]:0x1
[   1]:0x2
[   2]:0x3
[   3]:0x4
[   4]:0x5
[   5]:0x6
[   6]:0x7
[   7]:0x8
[   8]:0x9
[   9]:0xa
[  10]:0xb
[  11]:0xc
[  12]:0xd
[  13]:0xe
[  14]:0xf
[  15]:0x21
```
3. List namespaces of an NVMe drive
```
#sudo ./switchtec-nvme list-ns 0x3300@10.188.117.80:0
[   0]:0x1
[   1]:0x2
[   2]:0x3
[   3]:0x4
[   4]:0x5
```
4. Create a 4GB namespace
```
#sudo ./switchtec-nvme  create-ns 0x3300@10.188.117.80:0 -c 1048576 -s 1048576 -f 2
create-ns: Success, created nsid:6
```
5. Attach a namespace to a controller
```
#sudo ./switchtec-nvme attach-ns 0x3300@10.188.117.80:0 -n 6 -c 0x21
attach-ns: Success, nsid:6
```
6. List all NVMe devices and namespaces
```
#sudo ./switchtec-nvme switchtec list -r 10.188.117.80:0
Node                       SN                   Model                                    Namespace Usage                      Format           FW Rev
-------------------------- -------------------- ---------------------------------------- --------- -------------------------- ---------------- --------
0x3300@10.188.117.80:0   SERIALNUMBER         VENDOR MODEL                             1           6.55  MB /   6.55  MB    512   B +  0 B   REVISION
0x3300@10.188.117.80:0   SERIALNUMBER         VENDOR MODEL                             2          13.11  MB /  13.11  MB    512   B +  0 B   REVISION
0x3300@10.188.117.80:0   SERIALNUMBER         VENDOR MODEL                             3         131.07  MB / 131.07  MB    512   B +  0 B   REVISION
0x3300@10.188.117.80:0   SERIALNUMBER         VENDOR MODEL                             4           2.15  GB /   2.15  GB    512   B +  0 B   REVISION
0x3300@10.188.117.80:0   SERIALNUMBER         VENDOR MODEL                             5           2.15  GB /   2.15  GB    512   B +  0 B   REVISION
0x3300@10.188.117.80:0   SERIALNUMBER         VENDOR MODEL                             6           4.29  GB /   4.29  GB      4 KiB +  0 B   REVISION
```
7. Allocate VQ and VI resources for the controller
```
#sudo ./switchtec-nvme virt-mgmt 0x3300@10.188.117.80 -c1 -r0 -a8 -n2
success, Number of Resources allocated:0x2
#sudo ./switchtec-nvme virt-mgmt 0x3300@10.188.117.80 -c1 -r1 -a8 -n2
success, Number of Resources allocated:0x2
```
8. Reset the controller and then bring it online (note that `0x3300` is the ID for the primary controller, and `0x3301` is for the secondary controller 1)
```
#sudo ./switchtec-nvme switchtec vf-reset 0x3301@10.188.117.80 -f
#sudo ./switchtec-nvme virt-mgmt 0x3300@10.188.117.80 -c1 -r1 -a9
success, Number of Resources allocated:0
```
9. Now you can bind the controller to a PAX device and start using the namespace resource

10. Bring the controller offline
```
#sudo ./switchtec-nvme virt-mgmt 0x3300@10.188.117.80 -c1 -r1 -a7
success, Number of Resources allocated:0
```
11. Detach a namespace from a controller
```
#sudo ./switchtec-nvme detach-ns 0x3300@10.188.117.80:0 -n 6 -c 0x21
detach-ns: Success, nsid:6
```
12. Delete a namespace
```
#sudo ./switchtec-nvme delete-ns 0x3300@10.188.117.80:0 -n 6
delete-ns: Success, deleted nsid:6
```
13. List all NVMe devices and namespaces
```
#sudo ./switchtec-nvme switchtec list -r 10.188.117.80:0
Node                       SN                   Model                                    Namespace Usage                      Format           FW Rev
-------------------------- -------------------- ---------------------------------------- --------- -------------------------- ---------------- --------
0x3300@10.188.117.80:0   SERIALNUMBER         VENDOR MODEL                             1           6.55  MB /   6.55  MB    512   B +  0 B   REVISION
0x3300@10.188.117.80:0   SERIALNUMBER         VENDOR MODEL                             2          13.11  MB /  13.11  MB    512   B +  0 B   REVISION
0x3300@10.188.117.80:0   SERIALNUMBER         VENDOR MODEL                             3         131.07  MB / 131.07  MB    512   B +  0 B   REVISION
0x3300@10.188.117.80:0   SERIALNUMBER         VENDOR MODEL                             4           2.15  GB /   2.15  GB    512   B +  0 B   REVISION
0x3300@10.188.117.80:0   SERIALNUMBER         VENDOR MODEL                             5           2.15  GB /   2.15  GB    512   B +  0 B   REVISION
```

[0]: https://github.com/linux-nvme/nvme-cli
[1]: https://github.com/Microsemi/switchtec-user
[2]: https://github.com/Microsemi/switchtec-kernel

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