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SubjectRe: [PATCH net-next 1/2] net/ncsi: Add NCSI Broadcom OEM command
Date


On 10/7/18, 5:58 PM, "Samuel Mendoza-Jonas" <sam@mendozajonas.com> wrote:

On Fri, 2018-10-05 at 12:01 -0700, Vijay Khemka wrote:
> This patch adds OEM Broadcom commands and response handling. It also
> defines OEM Get MAC Address handler to get and configure the device.
>
> ncsi_oem_gma_handler_bcm: This handler send NCSI broadcom command for
> getting mac address.
> ncsi_rsp_handler_oem_bcm: This handles response received for all
> broadcom OEM commands.
> ncsi_rsp_handler_oem_bcm_gma: This handles get mac address response and
> set it to device.
>
> Signed-off-by: Vijay Khemka <vijaykhemka@fb.com>

Hi Vijay,

Looks good, and I've tested this on a BMC with a Broadcom network
controller and it properly sets a MAC address. A question below about the
response handler:

Hi Sam,
Thanks for feedback, I will update code for response handler. Please see my response below.


> +/* Response handler for Broadcom command Get Mac Address */
> +static int ncsi_rsp_handler_oem_bcm_gma(struct ncsi_request *nr)
> +{
> + struct ncsi_rsp_oem_pkt *rsp;
> + struct ncsi_dev_priv *ndp = nr->ndp;
> + struct net_device *ndev = ndp->ndev.dev;
> + int ret = 0;
> + const struct net_device_ops *ops = ndev->netdev_ops;
> + struct sockaddr saddr;
> +
> + /* Get the response header */
> + rsp = (struct ncsi_rsp_oem_pkt *)skb_network_header(nr->rsp);
> +
> + saddr.sa_family = ndev->type;
> + ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
> + memcpy(saddr.sa_data, &rsp->data[BCM_MAC_ADDR_OFFSET], ETH_ALEN);
> + /* Increase mac address by 1 for BMC's address */
> + saddr.sa_data[ETH_ALEN - 1]++;

Is this convention documented somewhere, and could you provide a link to
it if so?

Also what happens here if the final byte of the address is 0xff, this
will overflow and not carry right?

This is a Facebook requirement to increment MAC address by 1 as base address is defined for
server followed by BMC address. I will handle this Facebook specific code differently in new
patch. For generic Broadcom card, I will just get base mac address and not add any convention.

> + ret = ops->ndo_set_mac_address(ndev, &saddr);
> + if (ret < 0)
> + netdev_warn(ndev, "NCSI: 'Writing mac address to device failed\n");

Also a minor nitpick, there's a bonus "'" in this message.

Will be taken care in next version.


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