netdev - Re: [RFC PATCH v3 4/6] dpll: get source/output name

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Date:   Mon, 10 Oct 2022 11:45:55 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Vadim Fedorenko <vfedorenko@...ek.ru>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org, Vadim Fedorenko <vadfed@...com>
Subject: Re: [RFC PATCH v3 4/6] dpll: get source/output name

Mon, Oct 10, 2022 at 03:18:02AM CEST, vfedorenko@...ek.ru wrote:
>From: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
>
>Dump names of sources and outputs in response to DPLL_CMD_DEVICE_GET dump
>request.
>
>Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
>---
> drivers/dpll/dpll_netlink.c | 24 ++++++++++++++++++++++++
> include/linux/dpll.h        |  2 ++
> include/uapi/linux/dpll.h   |  2 ++
> 3 files changed, 28 insertions(+)
>
>diff --git a/drivers/dpll/dpll_netlink.c b/drivers/dpll/dpll_netlink.c
>index a5779871537a..e3604c10b59e 100644
>--- a/drivers/dpll/dpll_netlink.c
>+++ b/drivers/dpll/dpll_netlink.c
>@@ -31,12 +31,16 @@ static const struct nla_policy dpll_genl_set_source_policy[] = {
> 	[DPLLA_DEVICE_ID]	= { .type = NLA_U32 },
> 	[DPLLA_SOURCE_ID]	= { .type = NLA_U32 },
> 	[DPLLA_SOURCE_TYPE]	= { .type = NLA_U32 },
>+	[DPLLA_SOURCE_NAME]	= { .type = NLA_STRING,
>+				    .len = DPLL_NAME_LENGTH },
> };
> 
> static const struct nla_policy dpll_genl_set_output_policy[] = {
> 	[DPLLA_DEVICE_ID]	= { .type = NLA_U32 },
> 	[DPLLA_OUTPUT_ID]	= { .type = NLA_U32 },
> 	[DPLLA_OUTPUT_TYPE]	= { .type = NLA_U32 },
>+	[DPLLA_OUTPUT_NAME]	= { .type = NLA_STRING,
>+				    .len = DPLL_NAME_LENGTH },
> };
> 
> static const struct nla_policy dpll_genl_set_src_select_mode_policy[] = {
>@@ -100,6 +104,7 @@ static int __dpll_cmd_dump_sources(struct dpll_device *dpll,
> {
> 	int i, ret = 0, type, prio;
> 	struct nlattr *src_attr;
>+	const char *name;
> 
> 	for (i = 0; i < dpll->sources_count; i++) {
> 		src_attr = nla_nest_start(msg, DPLLA_SOURCE);
>@@ -132,6 +137,15 @@ static int __dpll_cmd_dump_sources(struct dpll_device *dpll,
> 				break;
> 			}
> 		}
>+		if (dpll->ops->get_source_name) {
>+			name = dpll->ops->get_source_name(dpll, i);
>+			if (name && nla_put_string(msg, DPLLA_SOURCE_NAME,
>+						   name)) {
>+				nla_nest_cancel(msg, src_attr);
>+				ret = -EMSGSIZE;
>+				break;
>+			}
>+		}
> 		nla_nest_end(msg, src_attr);
> 	}
> 
>@@ -143,6 +157,7 @@ static int __dpll_cmd_dump_outputs(struct dpll_device *dpll,
> {
> 	struct nlattr *out_attr;
> 	int i, ret = 0, type;
>+	const char *name;
> 
> 	for (i = 0; i < dpll->outputs_count; i++) {
> 		out_attr = nla_nest_start(msg, DPLLA_OUTPUT);
>@@ -167,6 +182,15 @@ static int __dpll_cmd_dump_outputs(struct dpll_device *dpll,
> 			}
> 			ret = 0;
> 		}
>+		if (dpll->ops->get_output_name) {
>+			name = dpll->ops->get_output_name(dpll, i);
>+			if (name && nla_put_string(msg, DPLLA_OUTPUT_NAME,
>+						   name)) {
>+				nla_nest_cancel(msg, out_attr);
>+				ret = -EMSGSIZE;
>+				break;
>+			}
>+		}
> 		nla_nest_end(msg, out_attr);
> 	}
> 
>diff --git a/include/linux/dpll.h b/include/linux/dpll.h
>index 3fe957a06b90..2f4964dc28f0 100644
>--- a/include/linux/dpll.h
>+++ b/include/linux/dpll.h
>@@ -23,6 +23,8 @@ struct dpll_device_ops {
> 	int (*set_output_type)(struct dpll_device *dpll, int id, int val);
> 	int (*set_source_select_mode)(struct dpll_device *dpll, int mode);
> 	int (*set_source_prio)(struct dpll_device *dpll, int id, int prio);
>+	const char *(*get_source_name)(struct dpll_device *dpll, int id);
>+	const char *(*get_output_name)(struct dpll_device *dpll, int id);

Hmm, why you exactly need the name for?


> };
> 
> struct dpll_device *dpll_device_alloc(struct dpll_device_ops *ops, const char *name,
>diff --git a/include/uapi/linux/dpll.h b/include/uapi/linux/dpll.h
>index f6b674e5cf01..8782d3425aae 100644
>--- a/include/uapi/linux/dpll.h
>+++ b/include/uapi/linux/dpll.h
>@@ -26,11 +26,13 @@ enum dpll_genl_attr {
> 	DPLLA_SOURCE,
> 	DPLLA_SOURCE_ID,
> 	DPLLA_SOURCE_TYPE,
>+	DPLLA_SOURCE_NAME,
> 	DPLLA_SOURCE_SUPPORTED,
> 	DPLLA_SOURCE_PRIO,
> 	DPLLA_OUTPUT,
> 	DPLLA_OUTPUT_ID,
> 	DPLLA_OUTPUT_TYPE,
>+	DPLLA_OUTPUT_NAME,
> 	DPLLA_OUTPUT_SUPPORTED,
> 	DPLLA_STATUS,
> 	DPLLA_TEMP,
>-- 
>2.27.0
>