linux-kernel - Re: [PATCH v3 fwctl 4/5] fwctl/bnxt

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Message-ID: <20260206012917.GC943673@ziepe.ca>
Date: Thu, 5 Feb 2026 21:29:17 -0400
From: Jason Gunthorpe <jgg@...pe.ca>
To: Pavan Chebbi <pavan.chebbi@...adcom.com>
Cc: Andy Gospodarek <andrew.gospodarek@...adcom.com>,
	Saeed Mahameed <saeedm@...dia.com>, michael.chan@...adcom.com,
	linux-kernel@...r.kernel.org, dave.jiang@...el.com,
	Jonathan.Cameron@...wei.com, gospo@...adcom.com,
	selvin.xavier@...adcom.com, leon@...nel.org,
	kalesh-anakkur.purayil@...adcom.com
Subject: Re: [PATCH v3 fwctl 4/5] fwctl/bnxt_fwctl: Add bnxt fwctl device

On Fri, Feb 06, 2026 at 06:54:37AM +0530, Pavan Chebbi wrote:

> Does that make the mechanism clear...

Nothing you have explained is different than how I understand it.

You clearly haven't understood what I'm explaining, please read both
my messages over several times until you get it.

I will help you one last time.

User uses this command:

struct hwrm_port_qstats_input {
        __le16 req_type;
        __le16 cmpl_ring;
        __le16 seq_id;
        __le16 target_id;
        __le64 resp_addr;
        __le16 port_id;
        u8 flags;
        u8 unused_0[5];
        __le64 tx_stat_host_addr;
       __le64 rx_stat_host_addr;
};

It sends the command buffer with tx_stat_host_addr set to 0xBAD

It sets num_dma = 0.

Explain what happens.

Jason