netdev - Re: [patch iproute2 3/3] devlink: implement flash status monitoring

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Date:   Fri, 24 May 2019 10:14:26 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, mlxsw@...lanox.com,
        sthemmin@...rosoft.com, dsahern@...il.com, saeedm@...lanox.com,
        leon@...nel.org
Subject: Re: [patch iproute2 3/3] devlink: implement flash status monitoring

Thu, May 23, 2019 at 07:57:03PM CEST, jakub.kicinski@...ronome.com wrote:
>On Thu, 23 May 2019 11:47:10 +0200, Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@...lanox.com>
>> 
>> Listen to status notifications coming from kernel during flashing and
>> put them on stdout to inform user about the status.
>> 
>> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
>
>> +static int cmd_dev_flash_status_cb(const struct nlmsghdr *nlh, void *data)
>> +{
>> +	struct cmd_dev_flash_status_ctx *ctx = data;
>> +	struct dl_opts *opts = &ctx->dl->opts;
>> +	struct genlmsghdr *genl = mnl_nlmsg_get_payload(nlh);
>> +	struct nlattr *tb[DEVLINK_ATTR_MAX + 1] = {};
>> +	const char *component = NULL;
>> +	uint64_t done = 0, total = 0;
>> +	const char *msg = NULL;
>> +	const char *bus_name;
>> +	const char *dev_name;
>> +
>> +	if (genl->cmd != DEVLINK_CMD_FLASH_UPDATE_STATUS &&
>> +	    genl->cmd != DEVLINK_CMD_FLASH_UPDATE_END)
>> +		return MNL_CB_STOP;
>> +
>> +	mnl_attr_parse(nlh, sizeof(*genl), attr_cb, tb);
>> +	if (!tb[DEVLINK_ATTR_BUS_NAME] || !tb[DEVLINK_ATTR_DEV_NAME])
>> +		return MNL_CB_ERROR;
>> +	bus_name = mnl_attr_get_str(tb[DEVLINK_ATTR_BUS_NAME]);
>> +	dev_name = mnl_attr_get_str(tb[DEVLINK_ATTR_DEV_NAME]);
>> +	if (strcmp(bus_name, opts->bus_name) ||
>> +	    strcmp(dev_name, opts->dev_name))
>> +		return MNL_CB_ERROR;
>> +
>> +	if (genl->cmd == DEVLINK_CMD_FLASH_UPDATE_END && ctx->not_first) {
>> +		pr_out("\n");
>> +		free(ctx->last_msg);
>> +		free(ctx->last_component);
>> +		ctx->received_end = 1;
>> +		return MNL_CB_STOP;
>> +	}
>
>> +	pid = fork();
>> +	if (pid == -1) {
>> +		close(pipe_r);
>> +		close(pipe_w);
>> +		return -errno;
>> +	} else if (!pid) {
>> +		/* In child, just execute the flash and pass returned
>> +		 * value through pipe once it is done.
>> +		 */
>> +		close(pipe_r);
>> +		err = _mnlg_socket_send(dl->nlg, nlh);
>> +		write(pipe_w, &err, sizeof(err));
>> +		close(pipe_w);
>> +		exit(0);
>> +	}
>> +	close(pipe_w);
>> +
>> +	do {
>> +		err = cmd_dev_flash_fds_process(&ctx, nlg_ntf, pipe_r);
>> +		if (err)
>> +			goto out;
>> +	} while (!ctx.flash_done || !ctx.received_end);
>
>Won't this loop forever if driver never sends
>DEVLINK_CMD_FLASH_UPDATE_END IOW doesn't implement status updates?

Hmm, right. Will look into this and fix.