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Date:   Sat, 23 Feb 2019 11:43:11 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Steve Wise <swise@...ngridcomputing.com>
Cc:     dsahern@...il.com, stephen@...workplumber.org,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH v1 iproute2-next 3/4] rdma: add 'link add/delete' commands

On Thu, Feb 21, 2019 at 08:19:12AM -0800, Steve Wise wrote:
> Add new 'link' subcommand 'add' and 'delete' to allow binding a soft-rdma
> device to a netdev interface.
>
> EG:
>
> rdma link add rxe_eth0 type rxe netdev eth0
> rdma link delete rxe_eth0
>
> Signed-off-by: Steve Wise <swise@...ngridcomputing.com>
> ---
>  rdma/link.c  | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  rdma/rdma.h  |  1 +
>  rdma/utils.c |  2 +-
>  3 files changed, 69 insertions(+), 1 deletion(-)
>
> diff --git a/rdma/link.c b/rdma/link.c
> index c064be627be2..afaf19663728 100644
> --- a/rdma/link.c
> +++ b/rdma/link.c
> @@ -14,6 +14,9 @@
>  static int link_help(struct rd *rd)
>  {
>  	pr_out("Usage: %s link show [DEV/PORT_INDEX]\n", rd->filename);
> +	pr_out("Usage: %s link add NAME type TYPE netdev NETDEV\n",
> +	       rd->filename);
> +	pr_out("Usage: %s link delete NAME\n", rd->filename);
>  	return 0;
>  }
>
> @@ -341,10 +344,74 @@ static int link_show(struct rd *rd)
>  	return rd_exec_link(rd, link_one_show, true);
>  }
>
> +static int link_add(struct rd *rd)
> +{
> +	char *name;
> +	char *type = NULL;
> +	char *dev = NULL;
> +	uint32_t seq;
> +
> +	if (rd_no_arg(rd)) {
> +		pr_err("No link name was supplied\n");

I think that it is better to have instruction message and not error
message: "Please provide ...".

> +		return -EINVAL;
> +	}
> +	name = rd_argv(rd);
> +	rd_arg_inc(rd);
> +	while (!rd_no_arg(rd)) {
> +		if (rd_argv_match(rd, "type")) {
> +			rd_arg_inc(rd);
> +			type = rd_argv(rd);
> +		} else if (rd_argv_match(rd, "netdev")) {
> +			rd_arg_inc(rd);
> +			dev = rd_argv(rd);
> +		} else {
> +			pr_err("Invalid parameter %s\n", rd_argv(rd));
> +			return -EINVAL;
> +		}
> +		rd_arg_inc(rd);

Please use chains of struct rd_cmd and rd_exec_cmd() instead of
open-coding parser.

> +	}
> +	if (!type) {
> +		pr_err("No type was supplied\n");
> +		return -EINVAL;

General parser handle it.

> +	}
> +	if (!dev) {
> +		pr_err("No net device was supplied\n");
> +		return -EINVAL;
> +	}

rd_exec_require_dev() ???

> +
> +	rd_prepare_msg(rd, RDMA_NLDEV_CMD_NEWLINK, &seq,
> +		       (NLM_F_REQUEST | NLM_F_ACK));
> +	mnl_attr_put_strz(rd->nlh, RDMA_NLDEV_ATTR_DEV_NAME, name);
> +	mnl_attr_put_strz(rd->nlh, RDMA_NLDEV_ATTR_LINK_TYPE, type);
> +	mnl_attr_put_strz(rd->nlh, RDMA_NLDEV_ATTR_NDEV_NAME, dev);
> +	return rd_sendrecv_msg(rd, seq);
> +}
> +
> +static int _link_del(struct rd *rd)
> +{
> +	uint32_t seq;
> +
> +	if (!rd_no_arg(rd)) {
> +		pr_err("Unknown parameter %s\n", rd_argv(rd));
> +		return -EINVAL;
> +	}
> +	rd_prepare_msg(rd, RDMA_NLDEV_CMD_DELLINK, &seq,
> +		       (NLM_F_REQUEST | NLM_F_ACK));
> +	mnl_attr_put_u32(rd->nlh, RDMA_NLDEV_ATTR_DEV_INDEX, rd->dev_idx);
> +	return rd_sendrecv_msg(rd, seq);
> +}
> +
> +static int link_del(struct rd *rd)
> +{
> +	return rd_exec_require_dev(rd, _link_del);
> +}
> +
>  int cmd_link(struct rd *rd)
>  {
>  	const struct rd_cmd cmds[] = {
>  		{ NULL,		link_show },
> +		{ "add",	link_add },
> +		{ "delete",	link_del },
>  		{ "show",	link_show },
>  		{ "list",	link_show },
>  		{ "help",	link_help },
> diff --git a/rdma/rdma.h b/rdma/rdma.h
> index 20be2f12c4f8..af4597f45640 100644
> --- a/rdma/rdma.h
> +++ b/rdma/rdma.h
> @@ -79,6 +79,7 @@ struct rd_cmd {
>   */
>  bool rd_no_arg(struct rd *rd);
>  void rd_arg_inc(struct rd *rd);
> +bool rd_argv_match(struct rd *rd, const char *pattern);
>
>  char *rd_argv(struct rd *rd);
>
> diff --git a/rdma/utils.c b/rdma/utils.c
> index a6f2826c9605..85a954167511 100644
> --- a/rdma/utils.c
> +++ b/rdma/utils.c
> @@ -32,7 +32,7 @@ int strcmpx(const char *str1, const char *str2)
>  	return strncmp(str1, str2, strlen(str1));
>  }
>
> -static bool rd_argv_match(struct rd *rd, const char *pattern)
> +bool rd_argv_match(struct rd *rd, const char *pattern)
>  {
>  	if (!rd_argc(rd))
>  		return false;
> --
> 1.8.3.1
>

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