linux-kernel - Re: [PATCH] RDMA/core: Publish node GUID with the uevent for ib

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Message-ID: <20250309192751.GA7027@unreal>
Date: Sun, 9 Mar 2025 21:27:51 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Abhinav Jain <jain.abhinav177@...il.com>
Cc: jgg@...pe.ca, linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] RDMA/core: Publish node GUID with the uevent for
 ib_device

On Sun, Mar 09, 2025 at 05:57:31PM +0000, Abhinav Jain wrote:
> As per the comment, modify ib_device_uevent to publish the node
> GUID alongside device name, upon device state change.
> 
> Have compiled the file manually to ensure that it builds. Do not have
> a readily available IB hardware to test. Confirmed with checkpatch
> that the patch has no errors/warnings.

I'm missing motivation for this patch. Why is this change needed?

Thanks

> 
> Signed-off-by: Abhinav Jain <jain.abhinav177@...il.com>
> ---
>  drivers/infiniband/core/device.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
> index 0ded91f056f3..1812038f1a91 100644
> --- a/drivers/infiniband/core/device.c
> +++ b/drivers/infiniband/core/device.c
> @@ -499,12 +499,17 @@ static void ib_device_release(struct device *device)
>  static int ib_device_uevent(const struct device *device,
>  			    struct kobj_uevent_env *env)
>  {
> -	if (add_uevent_var(env, "NAME=%s", dev_name(device)))
> +	const struct ib_device *dev =
> +		container_of(device, struct ib_device, dev);
> +
> +	if (add_uevent_var(env, "NAME=%s", dev_name(&dev->dev)))
>  		return -ENOMEM;
>  
> -	/*
> -	 * It would be nice to pass the node GUID with the event...
> -	 */
> +	__be64 node_guid_be = dev->node_guid;
> +	u64 node_guid = be64_to_cpu(node_guid_be);
> +
> +	if (add_uevent_var(env, "NODE_GUID=0x%llx", node_guid))
> +		return -ENOMEM;
>  
>  	return 0;
>  }
> -- 
> 2.34.1
>