linux-kernel - Re: [PATCH 4/8] scsi: megaraid_sas - check max_sgl reported by FW for setting max_sectors_per

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Message-Id: <20070928134434.4675c409.randy.dunlap@oracle.com>
Date:	Fri, 28 Sep 2007 13:44:34 -0700
From:	Randy Dunlap <randy.dunlap@...CLE.COM>
To:	bo yang <bo.yang@....com>
Cc:	linux-scsi@...r.kernel.org, James.Bottomley@...elEye.com,
	akpm@...l.org, linux-kernel@...r.kernel.org, Bo.yang@....com,
	Sumant.patro@....com
Subject: Re: [PATCH 4/8] scsi: megaraid_sas - check max_sgl reported by FW
 for setting max_sectors_per_req

On Wed, 26 Sep 2007 11:35:36 -0400 bo yang wrote:

> 1. Setting the max_sectors_per_req based on max SGL supported by the FW. Prior versions calculated  
>         this value from controller info's max_sectors_1, max_sectors_2. For certain controllers/FW, 
>         this was resulting in a value greater than max SGL supported by the FW. Now we take the min  
>         of max sgl from FW and max_sectors calculation.
> 
> 2. Increased MFI_POLL_TIMEOUT_SECS to 60 seconds from 10. FW may take a max of 60 seconds to  
>         respond to the INIT cmd.
> 
> Signed-off-by: Bo Yang <bo.yang@....com>
> 
> ---
>  drivers/scsi/megaraid/megaraid_sas.c |   13 +++++++++----
>  drivers/scsi/megaraid/megaraid_sas.h |    2 +-
>  2 files changed, 10 insertions(+), 5 deletions(-)
> 
> diff -uprN linux-2.6.22_orig/drivers/scsi/megaraid/megaraid_sas.c linux-2.6.22_new/drivers/scsi/megaraid/megaraid_sas.c
> --- linux-2.6.22_orig/drivers/scsi/megaraid/megaraid_sas.c	2007-09-27 20:40:14.000000000 -0700
> +++ linux-2.6.22_new/drivers/scsi/megaraid/megaraid_sas.c	2007-09-27 04:39:44.000000000 -0700
> @@ -1960,6 +1960,7 @@ static int megasas_init_mfi(struct megas
>  	u32 reply_q_sz;
>  	u32 max_sectors_1;
>  	u32 max_sectors_2;
> +	u32 tmp_sectors;
>  	struct megasas_register_set __iomem *reg_set;
>  	struct megasas_ctrl_info *ctrl_info;
>  	/*
> @@ -2052,17 +2053,21 @@ static int megasas_init_mfi(struct megas
>  	 * Note that older firmwares ( < FW ver 30) didn't report information
>  	 * to calculate max_sectors_1. So the number ended up as zero always.
>  	 */
> +	tmp_sectors = 0;
>  	if (ctrl_info && !megasas_get_ctrl_info(instance, ctrl_info)) {
>  
>  		max_sectors_1 = (1 << ctrl_info->stripe_sz_ops.min) *
>  		    ctrl_info->max_strips_per_io;
>  		max_sectors_2 = ctrl_info->max_request_size;
>  
> -		instance->max_sectors_per_req = (max_sectors_1 < max_sectors_2)
> +		tmp_sectors = (max_sectors_1 < max_sectors_2)
>  		    ? max_sectors_1 : max_sectors_2;

		tmp_sectors = min_t(u32, max_sectors_1, max_sectors_2);

> -	} else
> -		instance->max_sectors_per_req = instance->max_num_sge *
> -		    PAGE_SIZE / 512;
> +	}
> +
> +	instance->max_sectors_per_req = instance->max_num_sge *
> +						PAGE_SIZE / 512;
> +	if (tmp_sectors && (instance->max_sectors_per_req > tmp_sectors))
> +		instance->max_sectors_per_req = tmp_sectors;
>  
>  	kfree(ctrl_info);


---
~Randy
Phaedrus says that Quality is about caring.
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