Questions tagged [nvme]
93 questions
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Disconnecting and reconnecting nvme
Is there capacity within amazon/centos/linux to switch the ordering round of nitro disks?
I have an ami which consistently has devices in the incorrect order, by this I mean nvme1n1 and nvme2n1 should be switched round. If I run nvme id-ctrl -v…
keeer
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1 answer
Windows api for identifying NVMe drive
Is there any windows api which returns if the drive is of nvme type? In powershell, when I do
Get-PhysicalDisk | select Friendlyname, BusType, MediaType
it gives the MediaType as SSD and the BusType as RAID. Ealier, I was using the…
user3615045
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How to include linux driver source files in a kernel module written in C?
I am currently writing a linux kernel module that needs to include a file from the linux driver source code. The particular file I am trying to include is: https://elixir.bootlin.com/linux/latest/source/drivers/nvme/host/nvme.h
But the…
Basim Sahaf
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What is the most graceful way to make a kernel module talk to an NVMe driver?
I am currently writing a Kernel module that needs to talk to an NVMe device. What is the best way to do this? I looked into the SPDK library but seems like that it operates in the userspace, which is something that I am not looking for. I found that…
Basim Sahaf
- 33
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- 7
0
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1 answer
How do you read package temperature on NVME device inside of SPDK?
We are evaluating using SPDK as an internal framework to build a data recorder with NVMe devices.
Disk and SSD devices have had smartctl interfaces which give you package temperatures for a while. It looks like smartctl is now smart enough to do…
Nufosmatic
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linux kernel module not able to find "nvme_ns" struct
I am writing a module in which I am accessing the nvme device using major and minor number.
The code for the function is
src_disk = get_gendisk(MKDEV(si->src_major, si->src_minor), &part);
my_nvme_ns = (struct nvme_ns *)src_disk->private_data;
for…
Haris
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PCIe Problem -- Why pciehp gives contradictory log info
I am running fio jobs on my NVMe SSD and hotplug it then. The platform is hot-pluggable and the system is Centos 7.0.Several seconds after my plug-out, the system encounters a crash and gives these print info:
================
[ 1026.468414]…
Leo Erzhuo Chen
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- 1
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1 answer
How to check the malloc address is QWord aligned?
I want to test create NVMe I/O Submission Queue Invalid Queue Address Offset
I use C posix_memalign to alloc a memory range
But how to check that the address i get is QWord aligned?
I know if i want the address is word aligned then address end is…
JasonChiuCC
- 111
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- 6
0
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1 answer
setting 4k block size for NVMe in QEMU
I want to use 4k block size for emulated nvme device in qemu. So I end up with a script like this:
#!/bin/bash
QEMU_EXE="path/to/bin/qemu-system-x86_64"
SYSTEM_IMG="path/to/ubuntu1604.qcow2"
NVME_IMG="./nvme_8G.img"
$QEMU_EXE -m 2G \
…
Fengggli
- 123
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0
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1 answer
Is there any way for ioctl() in linux to specify submission queue ID for a nvme IO request
I am working on a testing tool for nvme-cli(written in c and can run on linux).
For SSD validation purpose, we are actually looking for sending I/O commands to a particular Submission queue(IO Queue pair). We needed this because we wanted threading,…
Arjun G S
- 23
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1 answer
How does a ioctl() call the driver code
I am working on a testing tool for nvme-cli(written in c and can run on linux).
For SSD validation purpose, i was actually looking for a custom command(For e.g. I/O command, write and then read the same and finally compare if both the data are…
Arjun G S
- 23
- 13
0
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0 answers
Is there a way to have a ioctl() with new(customized) command
I am working on a testing tool for nvme-cli(written in c and can run on linux).
For SSD validation purpose, i was actually looking for a custom command(For e.g. I/O command, write and then read the same and finally compare if both the data are…
Arjun G S
- 23
- 13
0
votes
0 answers
How can I have multiple threads working on the same for loop in C which in turn calls a function
This code is part of nvme-cli(its built on linux api)
I am trying to build an option to repeat a nvme-command say n times with p number of threads.
For example, if I say repeat 50-times with 5-threads, then each of the 5 threads should repeat…
Arjun G S
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- 13
0
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1 answer
OPAL-SED library ioctl usage?
I am trying to use the sed-opal libraries added in the linux-kernel 4.11
To do that, i have written a basic program like this:
#include
#include
#include
#include
#include
#include…
user3453931
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0
votes
1 answer
NVMoF: how to tell a command capsule from a response capsule
Let's say I have RoCEv2 traffic between 2 nodes A & B.
A uses RDMA_SEND to send a command capsule to B.
Then A receives a capsule from B (B also uses RDMA_SEND). At this moment, how does A know if this is the response to its command sent in step…
Yao Lin
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