netdev - Re: [PATCH iproute2 V3 1/4] rdma: Add basic infrastructure for RDMA tool

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Date:   Tue, 11 Jul 2017 10:23:14 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        Doug Ledford <dledford@...hat.com>,
        Ariel Almog <ariela@...lanox.com>,
        Linux RDMA <linux-rdma@...r.kernel.org>,
        Linux Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH iproute2 V3 1/4] rdma: Add basic infrastructure for RDMA
 tool

On Mon, Jul 10, 2017 at 09:47:17AM +0200, Jiri Pirko wrote:
> Tue, Jul 04, 2017 at 09:55:38AM CEST, leon@...nel.org wrote:
> >From: Leon Romanovsky <leonro@...lanox.com>
> >
> >RDMA devices are cross-functional devices from one side,
> >but very tailored for the specific markets from another.
> >
> >Such diversity caused to spread of RDMA related configuration
> >across various tools, e.g. devlink, ip, ethtool, ib specific and
> >vendor specific solutions.
> >
> >This patch adds ability to fill device and port information
> >by reading RDMA netlink.
> >
> >Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
>
> [...]
>
>
> >+
> >+int rd_dev_init_cb(const struct nlmsghdr *nlh, void *data)
> >+{
> >+	struct nlattr *tb[RDMA_NLDEV_ATTR_MAX] = {};
> >+	struct dev_map *dev_map;
> >+	struct rdma *rd = data;
> >+	const char *dev_name;
> >+
> >+	mnl_attr_parse(nlh, 0, rd_attr_cb, tb);
> >+	if (!tb[RDMA_NLDEV_ATTR_DEV_NAME] || !tb[RDMA_NLDEV_ATTR_DEV_INDEX])
> >+		return MNL_CB_ERROR;
> >+	if (!tb[RDMA_NLDEV_ATTR_PORT_INDEX]) {
> >+		pr_err("This tool doesn't support switches yet\n");
> >+		return MNL_CB_ERROR;
> >+	}
> >+
> >+	dev_name = mnl_attr_get_str(tb[RDMA_NLDEV_ATTR_DEV_NAME]);
> >+
> >+	dev_map = dev_map_alloc(dev_name);
> >+	if (!dev_map)
> >+		/* The main function will cleanup the allocations */
> >+		return MNL_CB_ERROR;
> >+	list_add_tail(&dev_map->list, &rd->dev_map_list);
> >+
> >+	dev_map->num_ports = mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_PORT_INDEX]);
> >+	dev_map->idx = mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_DEV_INDEX]);
> >+
> >+	return MNL_CB_OK;
> >+}
> >+
> >+void rdma_free_devmap(struct rdma *rd)
> >+{
> >+	if(!rd)
> >+		return;
> >+	dev_map_cleanup(rd);
> >+}
> >+
> >+int rdma_exec_cmd(struct rdma *rd, const struct rdma_cmd *cmds, const char *str)
>
> Sometimes the functions are prefixed "rd_", sometimes "rdma_".
> I think it would be nice to unify this with "rd_".

Right, I'll fix.

>
>
> >+{
> >+	const struct rdma_cmd *c;
> >+
> >+	/* First argument in objs table is default variant */
> >+	if (rd_no_arg(rd))
> >+		return cmds->func(rd);
> >+
> >+	for (c = cmds + 1; c->cmd; ++c) {
> >+		if (rd_argv_match(rd, c->cmd)) {
> >+			/* Move to next argument */
> >+			rd_arg_inc(rd);
> >+			return c->func(rd);
> >+		}
> >+	}
> >+
> >+	pr_err("Unknown %s '%s'.\n", str, rd_argv(rd));
> >+	return 0;
> >+}
> >+

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