linux-kernel - Re: [PATCH net-next] net/ncsi: Add NCSI Mellanox OEM command

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Message-ID: <D0F6A4CE-9BBB-45E2-8915-D02438FBFAB8@fb.com>
Date:   Mon, 26 Nov 2018 21:23:10 +0000
From:   Vijay Khemka <vijaykhemka@...com>
To:     David Miller <davem@...emloft.net>
CC:     "sam@...dozajonas.com" <sam@...dozajonas.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
        "Justin.Lee1@...l.com" <Justin.Lee1@...l.com>,
        "joel@....id.au" <joel@....id.au>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>
Subject: Re: [PATCH net-next] net/ncsi: Add NCSI Mellanox OEM command

Thanks David,
I will fix this and upload next version.

Regards
-Vijay

On 11/21/18, 4:55 PM, "David Miller" <davem@...emloft.net> wrote:

    From: Vijay Khemka <vijaykhemka@...com>
    Date: Tue, 20 Nov 2018 12:35:16 -0800
    
    > +static int ncsi_oem_gma_handler_mlx(struct ncsi_cmd_arg *nca)
    > +{
    > +	unsigned char data[NCSI_OEM_MLX_CMD_GMA_LEN];
    > +	int ret = 0;
    > +
    > +	nca->payload = NCSI_OEM_MLX_CMD_GMA_LEN;
    > +
    > +	memset(data, 0, NCSI_OEM_MLX_CMD_GMA_LEN);
    > +	*(unsigned int *)data = ntohl(NCSI_OEM_MFR_MLX_ID);
    
    'data' is not necessarily aligned on an unsigned int boundary.
    
    But second of all you want to use a fixed size type like "u32" or
    similar here, not "unsigned int".
    
    Altogether, something like:
    
    	union {
    		u8 data_u8[NCSI_OEM_MLX_CMD_GMA_LEN];
    		u32 data_u32[[NCSI_OEM_MLX_CMD_GMA_LEN / sizeof(u32)];
    	} u;
    
    	memset(&u, 0, sizeof(u));
    	u.data_u32[0] = ntohl(NCSI_OEM_MFR_MLX_ID);
    	u.data_u8[5] = NCSI_OEM_MLX_CMD_GMA;
    	u.data_u8[6] = NCSI_OEM_MLX_CMD_GMA_PARAM;
    
    If the rest of the ncsi driver has crud like this, it all needs
    to be fixed up similarly.