[dpdk-stable] [dpdk-dev] [PATCH] net/iavf: fix vector id assignment

[Zhang, Qi Z]

> -----Original Message-----
> From: dev <dev-bounces at dpdk.org> On Behalf Of dapengx.yu at intel.com
> Sent: Wednesday, December 30, 2020 2:54 PM
> To: Wu, Jingjing <jingjing.wu at intel.com>; Xing, Beilei <beilei.xing at intel.com>
> Cc: dev at dpdk.org; Yu, DapengX <dapengx.yu at intel.com>; stable at dpdk.org
> Subject: [dpdk-dev] [PATCH] net/iavf: fix vector id assignment
> 
> From: YU DAPENG <dapengx.yu at intel.com>
> 
> When the interrupt handle instance allows none packet I/O interrupts, the max
> value of vector_id is set to be less than the number of msix interrupts, but not
> equal to it. Which may cause same vector_id is sent to PF with opcode
> VIRTCHNL_OP_CONFIG_IRQ_MAP to setup the cause of interrupt mapping in
> iavf_config_irq_map(), these are invalid parameters, cause error:
> VIRTCHNL_STATUS_ERR_PARAM(-5). So add code to set the max value of
> vector_id to be equal to the number of msix interrupts.
> 
> Fixes: d6bde6b5eae9 ("net/avf: enable Rx interrupt")
> Cc: stable at dpdk.org
> 
> Signed-off-by: YU DAPENG <dapengx.yu at intel.com>
> ---
>  drivers/net/iavf/iavf_ethdev.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/iavf/iavf_ethdev.c b/drivers/net/iavf/iavf_ethdev.c index
> 7e3c26a94..54ea3a36c 100644
> --- a/drivers/net/iavf/iavf_ethdev.c
> +++ b/drivers/net/iavf/iavf_ethdev.c
> @@ -578,7 +578,7 @@ static int iavf_config_rx_queues_irqs(struct rte_eth_dev
> *dev,
>  				qv_map[i].queue_id = i;
>  				qv_map[i].vector_id = vec;
>  				intr_handle->intr_vec[i] = vec++;
> -				if (vec >= vf->nb_msix)
> +				if (vec > vf->nb_msix)

This is not correct, the nb_msix should already include the vector 0, we should not set a vector_id to a value that >= nb_msix, 

>  					vec = IAVF_RX_VEC_START;
>  			}
>  			vf->qv_map = qv_map;
> --
> 2.27.0