netdev - Re: [PATCH net-next] ibmvnic: Add device identification to requested IRQs

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Date:   Thu, 25 Apr 2019 12:18:34 -0500
From:   Thomas Falcon <tlfalcon@...ux.ibm.com>
To:     Murilo Fossa Vicentini <muvic@...ux.ibm.com>,
        netdev@...r.kernel.org
Cc:     maurosr@...ux.vnet.ibm.com
Subject: Re: [PATCH net-next] ibmvnic: Add device identification to requested
 IRQs


On 4/25/19 9:02 AM, Murilo Fossa Vicentini wrote:
> The ibmvnic driver currently uses the same fixed name when using
> request_irq, this makes it hard to parse when multiple VNIC devices are
> available at the same time. This patch adds the unit_address as the device
> identification along with an id for each queue.
>
> The original idea was to use the interface name as an identifier, but it
> is not feasible given these requests happen at adapter probe, and at this
> point netdev is not yet registered so it doesn't have the proper name
> assigned to it.
>
> Signed-off-by: Murilo Fossa Vicentini <muvic@...ux.ibm.com>
> ---

Reviewed-by: Thomas Falcon <tlfalcon@...ux.ibm.com>

Thanks, Murilo!

>   drivers/net/ethernet/ibm/ibmvnic.c | 13 +++++++++----
>   drivers/net/ethernet/ibm/ibmvnic.h |  2 ++
>   2 files changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
> index 5e3cdb0b46d5..b398d6c94dbd 100644
> --- a/drivers/net/ethernet/ibm/ibmvnic.c
> +++ b/drivers/net/ethernet/ibm/ibmvnic.c
> @@ -2919,8 +2919,10 @@ static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter)
>   			goto req_tx_irq_failed;
>   		}
>   
> +		snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-tx%d",
> +			 adapter->vdev->unit_address, i);
>   		rc = request_irq(scrq->irq, ibmvnic_interrupt_tx,
> -				 0, "ibmvnic_tx", scrq);
> +				 0, scrq->name, scrq);
>   
>   		if (rc) {
>   			dev_err(dev, "Couldn't register tx irq 0x%x. rc=%d\n",
> @@ -2940,8 +2942,10 @@ static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter)
>   			dev_err(dev, "Error mapping irq\n");
>   			goto req_rx_irq_failed;
>   		}
> +		snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-rx%d",
> +			 adapter->vdev->unit_address, i);
>   		rc = request_irq(scrq->irq, ibmvnic_interrupt_rx,
> -				 0, "ibmvnic_rx", scrq);
> +				 0, scrq->name, scrq);
>   		if (rc) {
>   			dev_err(dev, "Couldn't register rx irq 0x%x. rc=%d\n",
>   				scrq->irq, rc);
> @@ -4667,8 +4671,9 @@ static int init_crq_queue(struct ibmvnic_adapter *adapter)
>   		     (unsigned long)adapter);
>   
>   	netdev_dbg(adapter->netdev, "registering irq 0x%x\n", vdev->irq);
> -	rc = request_irq(vdev->irq, ibmvnic_interrupt, 0, IBMVNIC_NAME,
> -			 adapter);
> +	snprintf(crq->name, sizeof(crq->name), "ibmvnic-%x",
> +		 adapter->vdev->unit_address);
> +	rc = request_irq(vdev->irq, ibmvnic_interrupt, 0, crq->name, adapter);
>   	if (rc) {
>   		dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n",
>   			vdev->irq, rc);
> diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h
> index d5260a206708..cffdac372a33 100644
> --- a/drivers/net/ethernet/ibm/ibmvnic.h
> +++ b/drivers/net/ethernet/ibm/ibmvnic.h
> @@ -855,6 +855,7 @@ struct ibmvnic_crq_queue {
>   	dma_addr_t msg_token;
>   	spinlock_t lock;
>   	bool active;
> +	char name[32];
>   };
>   
>   union sub_crq {
> @@ -881,6 +882,7 @@ struct ibmvnic_sub_crq_queue {
>   	struct sk_buff *rx_skb_top;
>   	struct ibmvnic_adapter *adapter;
>   	atomic_t used;
> +	char name[32];
>   };
>   
>   struct ibmvnic_long_term_buff {