linux-kernel - Re: [Patch v2 3/5] RDMA/mana_ib : Add error eq and notification from SoC

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Message-ID: <ZMEQxzqhdbNRxAfE@corigine.com>
Date:   Wed, 26 Jul 2023 14:25:43 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     sharmaajay@...uxonhyperv.com
Cc:     Jason Gunthorpe <jgg@...pe.ca>, Leon Romanovsky <leon@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>, Wei Liu <wei.liu@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-rdma@...r.kernel.org,
        linux-hyperv@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Ajay Sharma <sharmaajay@...rosoft.com>
Subject: Re: [Patch v2 3/5] RDMA/mana_ib : Add error eq and notification from
 SoC

On Tue, Jul 25, 2023 at 08:56:58PM -0700, sharmaajay@...uxonhyperv.com wrote:

...

> diff --git a/drivers/infiniband/hw/mana/main.c b/drivers/infiniband/hw/mana/main.c
> index 2c4e3c496644..2ea24ba3065f 100644
> --- a/drivers/infiniband/hw/mana/main.c
> +++ b/drivers/infiniband/hw/mana/main.c
> @@ -504,3 +504,47 @@ int mana_ib_query_gid(struct ib_device *ibdev, u32 port, int index,
>  void mana_ib_disassociate_ucontext(struct ib_ucontext *ibcontext)
>  {
>  }
> +
> +void mana_ib_soc_event_handler(void *ctx, struct gdma_queue *queue,
> +				struct gdma_event *event)

Hi Ajay,

I wonder if this function should be static.
It seems to only be used in this file.

> diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c

...

> @@ -435,44 +434,47 @@ static int mana_gd_register_irq(struct gdma_queue *queue,
>  	gc = gd->gdma_context;
>  	r = &gc->msix_resource;
>  	dev = gc->dev;
> +	msi_index = spec->eq.msix_index;
>  
>  	spin_lock_irqsave(&r->lock, flags);
>  
> -	msi_index = find_first_zero_bit(r->map, r->size);
> -	if (msi_index >= r->size || msi_index >= gc->num_msix_usable) {
> -		err = -ENOSPC;
> -	} else {
> -		bitmap_set(r->map, msi_index, 1);
> -		queue->eq.msix_index = msi_index;
> -	}
> -
> -	spin_unlock_irqrestore(&r->lock, flags);
> +	if (!spec->eq.msix_allocated) {
> +		msi_index = find_first_zero_bit(r->map, r->size);
>  
> -	if (err) {
> -		dev_err(dev, "Register IRQ err:%d, msi:%u rsize:%u, nMSI:%u",
> -			err, msi_index, r->size, gc->num_msix_usable);
> +			if (msi_index >= r->size ||
> +			    msi_index >= gc->num_msix_usable)
> +				err = -ENOSPC;
> +			else
> +				bitmap_set(r->map, msi_index, 1);

It looks like the indention of the lines above is off.
There seems to be one tab too many.

>  
> -		return err;
> +		if (err) {
> +			dev_err(dev, "Register IRQ err:%d, msi:%u rsize:%u, nMSI:%u",
> +				err, msi_index, r->size, gc->num_msix_usable);
> +				goto out;
> +		}
>  	}

...