linux-kernel - Re: [net PATCH] octeontx2-af: Fix start and end bit for scan config

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Message-ID: <20230302092133.GB561905@unreal>
Date:   Thu, 2 Mar 2023 11:21:33 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Ratheesh Kannoth <rkannoth@...vell.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, sgoutham@...vell.com
Subject: Re: [net PATCH] octeontx2-af: Fix start and end bit for scan config

On Thu, Mar 02, 2023 at 08:58:55AM +0530, Ratheesh Kannoth wrote:
> for_each_set_bit_from() needs start bit as one bit prior
> and end bit as one bit post position in the bit map
> 
> Fixes: 88fffc65f940 (octeontx2-af: Exact match scan from kex profile)

This is wrong Fixes line. It should be:
Fixes: 812103edf670 ("octeontx2-af: Exact match scan from kex profile")

Thanks

> Signed-off-by: Ratheesh Kannoth <rkannoth@...vell.com>
> Reviewed-by: Sunil Kovvuri Goutham <sgoutham@...vell.com>
> ---
>  drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c
> index 327d3c6b1175..9c7bbef27e31 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c
> @@ -603,9 +603,8 @@ static int npc_scan_kex(struct rvu *rvu, int blkaddr, u8 intf)
>  	 * exact match code.
>  	 */
>  	masked_cfg = cfg & NPC_EXACT_NIBBLE;
> -	bitnr = NPC_EXACT_NIBBLE_START;
> -	for_each_set_bit_from(bitnr, (unsigned long *)&masked_cfg,
> -			      NPC_EXACT_NIBBLE_START) {
> +	bitnr = NPC_EXACT_NIBBLE_START - 1;
> +	for_each_set_bit_from(bitnr, (unsigned long *)&masked_cfg, NPC_EXACT_NIBBLE_END + 1) {
>  		npc_scan_exact_result(mcam, bitnr, key_nibble, intf);
>  		key_nibble++;
>  	}
> -- 
> 2.25.1
>