netdev - Re: [PATCH net v3 1/3] net: hns: support deferred probe when can not obtain irq

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Message-ID: <acf5e830-d9bd-7caf-11d3-f4a6957f8496@suse.com>
Date:   Wed, 26 Apr 2017 16:03:17 +0200
From:   Matthias Brugger <mbrugger@...e.com>
To:     Yankejian <yankejian@...wei.com>, davem@...emloft.net,
        salil.mehta@...wei.com, yisen.zhuang@...wei.com,
        lipeng321@...wei.com, zhouhuiru@...wei.com,
        huangdaode@...ilicon.com
Cc:     netdev@...r.kernel.org, linuxarm@...wei.com
Subject: Re: [PATCH net v3 1/3] net: hns: support deferred probe when can not
 obtain irq



On 26/04/17 09:00, Yankejian wrote:
> From: lipeng <lipeng321@...wei.com>
>
> In the hip06 and hip07 SoCs, the interrupt lines from the
> DSAF controllers are connected to mbigen hw module.
> The mbigen module is probed with module_init, and, as such,
> is not guaranteed to probe before the HNS driver. So we need
> to support deferred probe.
>
> We check for probe deferral in the hw layer probe, so we not
> probe into the main layer and memories, etc., to later learn
> that we need to defer the probe.

This paragraph does not hold any more and should be deleted.

Other then this:
Reviewed-by: Matthias Brugger <mbrugger@...e.com>

>
> Signed-off-by: lipeng <lipeng321@...wei.com>
> Reviewed-by: Yisen Zhuang <yisen.zhuang@...wei.com>
> ---
> V2 -> V3:
> 1. Check return value when  platform_get_irq in hns_rcb_get_cfg;
> ---
>  drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.c | 4 +++-
>  drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.c | 8 +++++++-
>  drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.h | 2 +-
>  3 files changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.c b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.c
> index 6ea8722..a41cf95 100644
> --- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.c
> +++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.c
> @@ -510,7 +510,9 @@ int hns_ppe_init(struct dsaf_device *dsaf_dev)
>
>  		hns_ppe_get_cfg(dsaf_dev->ppe_common[i]);
>
> -		hns_rcb_get_cfg(dsaf_dev->rcb_common[i]);
> +		ret = hns_rcb_get_cfg(dsaf_dev->rcb_common[i]);
> +		if (ret)
> +			goto get_rcb_cfg_fail;
>  	}
>
>  	for (i = 0; i < HNS_PPE_COM_NUM; i++)
> diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.c b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.c
> index f0ed80d6..673a5d3 100644
> --- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.c
> +++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.c
> @@ -452,7 +452,7 @@ static int hns_rcb_get_base_irq_idx(struct rcb_common_cb *rcb_common)
>   *hns_rcb_get_cfg - get rcb config
>   *@..._common: rcb common device
>   */
> -void hns_rcb_get_cfg(struct rcb_common_cb *rcb_common)
> +int hns_rcb_get_cfg(struct rcb_common_cb *rcb_common)
>  {
>  	struct ring_pair_cb *ring_pair_cb;
>  	u32 i;
> @@ -477,10 +477,16 @@ void hns_rcb_get_cfg(struct rcb_common_cb *rcb_common)
>  		ring_pair_cb->virq[HNS_RCB_IRQ_IDX_RX] =
>  		is_ver1 ? platform_get_irq(pdev, base_irq_idx + i * 2 + 1) :
>  			  platform_get_irq(pdev, base_irq_idx + i * 3);
> +		if ((ring_pair_cb->virq[HNS_RCB_IRQ_IDX_TX] == -EPROBE_DEFER) ||
> +		    (ring_pair_cb->virq[HNS_RCB_IRQ_IDX_RX] == -EPROBE_DEFER))
> +			return -EPROBE_DEFER;
> +
>  		ring_pair_cb->q.phy_base =
>  			RCB_COMM_BASE_TO_RING_BASE(rcb_common->phy_base, i);
>  		hns_rcb_ring_pair_get_cfg(ring_pair_cb);
>  	}
> +
> +	return 0;
>  }
>
>  /**
> diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.h b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.h
> index 99b4e1b..3d7b484 100644
> --- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.h
> +++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.h
> @@ -110,7 +110,7 @@ struct rcb_common_cb {
>  void hns_rcb_common_free_cfg(struct dsaf_device *dsaf_dev, u32 comm_index);
>  int hns_rcb_common_init_hw(struct rcb_common_cb *rcb_common);
>  void hns_rcb_start(struct hnae_queue *q, u32 val);
> -void hns_rcb_get_cfg(struct rcb_common_cb *rcb_common);
> +int hns_rcb_get_cfg(struct rcb_common_cb *rcb_common);
>  void hns_rcb_get_queue_mode(enum dsaf_mode dsaf_mode,
>  			    u16 *max_vfn, u16 *max_q_per_vf);
>
>