netdev - Re: [PATCH net v2] qed: rdma - don't wait for resources under hw error recovery flow

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Message-ID: <YUr59luiezKbdOyW@unreal>
Date:   Wed, 22 Sep 2021 12:40:06 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Shai Malin <smalin@...vell.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        linux-rdma@...r.kernel.org, jgg@...pe.ca, aelior@...vell.com,
        malin1024@...il.com, Michal Kalderon <mkalderon@...vell.com>
Subject: Re: [PATCH net v2] qed: rdma - don't wait for resources under hw
 error recovery flow

On Wed, Sep 22, 2021 at 10:36:31AM +0300, Shai Malin wrote:
> If the HW device is during recovery, the HW resources will never return,
> hence we shouldn't wait for the CID (HW context ID) bitmaps to clear.
> This fix speeds up the error recovery flow.
> 
> Changes since v1:
> - Fix race condition (thanks to Leon Romanovsky).

Please put changelog under "---", there is a little value for them in the
commit message.

> 
> Fixes: 64515dc899df ("qed: Add infrastructure for error detection and recovery")
> Signed-off-by: Michal Kalderon <mkalderon@...vell.com>
> Signed-off-by: Ariel Elior <aelior@...vell.com>
> Signed-off-by: Shai Malin <smalin@...vell.com>
> ---
>  drivers/net/ethernet/qlogic/qed/qed_iwarp.c | 8 ++++++++
>  drivers/net/ethernet/qlogic/qed/qed_roce.c  | 8 ++++++++
>  2 files changed, 16 insertions(+)
> 
> diff --git a/drivers/net/ethernet/qlogic/qed/qed_iwarp.c b/drivers/net/ethernet/qlogic/qed/qed_iwarp.c
> index fc8b3e64f153..186d0048a9d1 100644
> --- a/drivers/net/ethernet/qlogic/qed/qed_iwarp.c
> +++ b/drivers/net/ethernet/qlogic/qed/qed_iwarp.c
> @@ -1297,6 +1297,14 @@ qed_iwarp_wait_cid_map_cleared(struct qed_hwfn *p_hwfn, struct qed_bmap *bmap)
>  	prev_weight = weight;
>  
>  	while (weight) {
> +		/* If the HW device is during recovery, all resources are
> +		 * immediately reset without receiving a per-cid indication
> +		 * from HW. In this case we don't expect the cid_map to be
> +		 * cleared.
> +		 */
> +		if (p_hwfn->cdev->recov_in_prog)
> +			return 0;
> +
>  		msleep(QED_IWARP_MAX_CID_CLEAN_TIME);
>  
>  		weight = bitmap_weight(bmap->bitmap, bmap->max_count);
> diff --git a/drivers/net/ethernet/qlogic/qed/qed_roce.c b/drivers/net/ethernet/qlogic/qed/qed_roce.c
> index f16a157bb95a..cf5baa5e59bc 100644
> --- a/drivers/net/ethernet/qlogic/qed/qed_roce.c
> +++ b/drivers/net/ethernet/qlogic/qed/qed_roce.c
> @@ -77,6 +77,14 @@ void qed_roce_stop(struct qed_hwfn *p_hwfn)
>  	 * Beyond the added delay we clear the bitmap anyway.
>  	 */
>  	while (bitmap_weight(rcid_map->bitmap, rcid_map->max_count)) {
> +		/* If the HW device is during recovery, all resources are
> +		 * immediately reset without receiving a per-cid indication
> +		 * from HW. In this case we don't expect the cid bitmap to be
> +		 * cleared.
> +		 */
> +		if (p_hwfn->cdev->recov_in_prog)
> +			return;
> +
>  		msleep(100);
>  		if (wait_count++ > 20) {
>  			DP_NOTICE(p_hwfn, "cid bitmap wait timed out\n");
> -- 
> 2.27.0
>