netdev - RE: [PATCH net-next] cxgb4: fix incorrect cim

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6DCFFFABCB@AcuExch.aculab.com>
Date:   Fri, 19 May 2017 14:17:11 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Ganesh Goudar' <ganeshgr@...lsio.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>
CC:     "nirranjan@...lsio.com" <nirranjan@...lsio.com>,
        "indranil@...lsio.com" <indranil@...lsio.com>
Subject: RE: [PATCH net-next] cxgb4: fix incorrect cim_la output for T6

From: Ganesh Goudar
> Sent: 19 May 2017 11:12
T6
> 
> take care of UpDbgLaRdPtr[0-3] restriction for T6
> 
> Signed-off-by: Ganesh Goudar <ganeshgr@...lsio.com>
> ---
>  drivers/net/ethernet/chelsio/cxgb4/t4_hw.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
> index aded42b96..917b46b 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
> +++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
> @@ -8268,6 +8268,13 @@ int t4_cim_read_la(struct adapter *adap, u32 *la_buf, unsigned int *wrptr)
>  		if (ret)
>  			break;
>  		idx = (idx + 1) & UPDBGLARDPTR_M;
> +
> +		/* Bits 0-3 of UpDbgLaRdPtr can be between 0000 to 1001 to
> +		 * identify the 32-bit portion of the full 312-bit data
> +		 */
> +		if (is_t6(adap->params.chip))
> +			while ((idx & 0xf) > 9)
> +				idx = (idx + 1) % UPDBGLARDPTR_M;

Why the loop, maybe:
		if (is_t6(adap->params.chip) && (idx & 0xf) >= 9)
			idx = (idx & 0xf0) + 0x10;
		else
			idx++;
		idx &= UPDBGLARDPTR_M;

	David