linux-kernel - Re: [PATCH V9 7/9] cxl/port: Introduce cxl_cdat

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Message-ID: <20220531172146.GB1457068@alison-desk>
Date:   Tue, 31 May 2022 10:21:46 -0700
From:   Alison Schofield <alison.schofield@...el.com>
To:     "Weiny, Ira" <ira.weiny@...el.com>
Cc:     "Williams, Dan J" <dan.j.williams@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        "Verma, Vishal L" <vishal.l.verma@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        Ben Widawsky <ben@...dawsk.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-cxl@...r.kernel.org" <linux-cxl@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH V9 7/9] cxl/port: Introduce cxl_cdat_valid()

On Tue, May 31, 2022 at 08:26:30AM -0700, Ira Weiny wrote:
> From: Ira Weiny <ira.weiny@...el.com>
> 
> The CDAT data is protected by a checksum and should be the proper
> length.
> 
> Introduce cxl_cdat_valid() to validate the data.  While at it check and
> store the sequence number.
> 
Store it for ?

>  
> +static bool cxl_cdat_valid(struct device *dev, struct cxl_cdat *cdat)
> +{

snip

> +
> +	seq = FIELD_GET(CDAT_HEADER_DW3_SEQUENCE, table[3]);
> +	/* Store the sequence for now. */
> +	if (cdat->seq != seq) {
> +		dev_info(dev, "CDAT seq change %x -> %x\n", cdat->seq, seq);
> +		cdat->seq = seq;
> +	}
> +

Wondering when does/will this sequence number come into play?

>