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From: "Xie, WeiX" <weix.xie@intel.com>
To: "Yu, DapengX" <dapengx.yu@intel.com>,
	"Zhang, Qi Z" <qi.z.zhang@intel.com>,
	"Wu, Jingjing" <jingjing.wu@intel.com>,
	"Xing, Beilei" <beilei.xing@intel.com>,
	"Xu, Ting" <ting.xu@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
	"Yu, DapengX" <dapengx.yu@intel.com>,
	"stable@dpdk.org" <stable@dpdk.org>
Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH] net/iavf: fix vector id assignment
Date: Mon, 11 Jan 2021 09:06:22 +0000	[thread overview]
Message-ID: <61168144445b48d3b4f0df77ce88650a@intel.com> (raw)
In-Reply-To: <20210108102111.7519-1-dapengx.yu@intel.com>

Tested-by:  Xie,WeiX < weix.xie@intel.com>

Regards,
Xie Wei


> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of
> dapengx.yu@intel.com
> Sent: Friday, January 8, 2021 6:21 PM
> To: Zhang, Qi Z <qi.z.zhang@intel.com>; Wu, Jingjing
> <jingjing.wu@intel.com>; Xing, Beilei <beilei.xing@intel.com>; Xu, Ting
> <ting.xu@intel.com>
> Cc: dev@dpdk.org; Yu, DapengX <dapengx.yu@intel.com>; stable@dpdk.org
> Subject: [dpdk-dev] [PATCH] net/iavf: fix vector id assignment
> 
> From: YU DAPENG <dapengx.yu@intel.com>
> 
> The number of MSI-X interrupts on Rx shall be the minimal value of the
> number of available MSI-X interrupts per VF - 1 (the 1 is for miscellaneous
> interrupt) and the number of configured Rx queues.
> The current code break the rule because the number of available MSI-X
> interrupts is used as the first value, but code does not subtract 1 from it.
> 
> In normal situation, the first value is larger than the second value. So each
> queue can be assigned a unique vector_id.
> 
> For example: 17 available MSI-X interrupts, and 16 available Rx queues per VF;
> but only 4 Rx queues are configured when device is started.
> vector_id:0 is for misc interrupt, vector_id:1 for Rx queue0,
> vector_id:2 for Rx queue1, vector_id:3 for Rx queue2, vector_id:4 for Rx
> queue3.
> 
> Current code breaks the rule in this normal situation, because when assign
> vector_ids to interrupt handle, for example, it does not assign
> vector_id:4 to the queue3, but assign vector_id:1 to it, because the condition
> used causes vector_id wrap around too early.
> 
> In iavf_config_irq_map(), the current code does not write data into the last
> element of vecmap[], because of the previous code break. Which cause
> wrong data is sent to PF with opcode VIRTCHNL_OP_CONFIG_IRQ_MAP and
> cause error: VIRTCHNL_STATUS_ERR_PARAM(-5).
> 
> If kernel driver supports large VFs (up to 256 queues), different queues can
> be assigned same vector_id.
> 
> In order to adapt to large VFs and avoid wrapping early, the condition is
> replaced from vec >= vf->nb_msix to vec >= vf->vf_res->max_vectors.
> 
> Fixes: d6bde6b5eae9 ("net/avf: enable Rx interrupt")
> Cc: stable@dpdk.org
> 
> Signed-off-by: YU DAPENG <dapengx.yu@intel.com>
> ---
>  drivers/net/iavf/iavf_ethdev.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/iavf/iavf_ethdev.c b/drivers/net/iavf/iavf_ethdev.c
> index 7e3c26a94..d730bb156 100644
> --- a/drivers/net/iavf/iavf_ethdev.c
> +++ b/drivers/net/iavf/iavf_ethdev.c
> @@ -483,6 +483,7 @@ static int iavf_config_rx_queues_irqs(struct
> rte_eth_dev *dev,
>  	struct iavf_qv_map *qv_map;
>  	uint16_t interval, i;
>  	int vec;
> +	uint16_t max_vectors;
> 
>  	if (rte_intr_cap_multiple(intr_handle) &&
>  	    dev->data->dev_conf.intr_conf.rxq) { @@ -570,15 +571,16 @@
> static int iavf_config_rx_queues_irqs(struct rte_eth_dev *dev,
>  			/* If Rx interrupt is reuquired, and we can use
>  			 * multi interrupts, then the vec is from 1
>  			 */
> -			vf->nb_msix = RTE_MIN(vf->vf_res->max_vectors,
> -					      intr_handle->nb_efd);
> +			max_vectors =
> +				vf->vf_res->max_vectors -
> IAVF_RX_VEC_START;
> +			vf->nb_msix = RTE_MIN(max_vectors, intr_handle-
> >nb_efd);
>  			vf->msix_base = IAVF_RX_VEC_START;
>  			vec = IAVF_RX_VEC_START;
>  			for (i = 0; i < dev->data->nb_rx_queues; i++) {
>  				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->vf_res->max_vectors)
>  					vec = IAVF_RX_VEC_START;
>  			}
>  			vf->qv_map = qv_map;
> --
> 2.27.0


  reply	other threads:[~2021-01-11  9:06 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-30  6:53 [dpdk-stable] " dapengx.yu
2020-12-30  7:31 ` [dpdk-stable] [dpdk-dev] " Xie, WeiX
2021-01-04  0:25 ` Zhang, Qi Z
2021-01-04  2:01   ` Yu, DapengX
2021-01-08 10:21 ` [dpdk-stable] " dapengx.yu
2021-01-11  9:06   ` Xie, WeiX [this message]
2021-01-12  6:26   ` Xu, Ting
2021-01-12  6:44     ` Wu, Jingjing
2021-01-12  7:08       ` Yu, DapengX
2021-01-12  6:46     ` Yu, DapengX

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