[PATCH v3 2/2] iproute2: add support for cpu set

[Daniel Golle]

On Thu, Feb 03, 2022 at 01:44:12AM +0100, Ansuel Smith wrote:
> Add support for cpu set useful to set CPU port for dsa devices.

Please also document the newly added 'cpu' parameter in the command-
line output -- the manpage isn't even installed/available for OpenWrt
users.

> 
> Signed-off-by: Ansuel Smith <ansuelsmth at gmail.com>
> ---
>  ...101-iplink_allow_to_change_cpu_value.patch | 81 +++++++++++++++++++
>  1 file changed, 81 insertions(+)
>  create mode 100644 package/network/utils/iproute2/patches/101-iplink_allow_to_change_cpu_value.patch
> 
> diff --git a/package/network/utils/iproute2/patches/101-iplink_allow_to_change_cpu_value.patch b/package/network/utils/iproute2/patches/101-iplink_allow_to_change_cpu_value.patch
> new file mode 100644
> index 00000000..1bb2bb1f
> --- /dev/null
> +++ b/package/network/utils/iproute2/patches/101-iplink_allow_to_change_cpu_value.patch
> @@ -0,0 +1,81 @@
> +From 8642516618b60a2827215f2bed54d4d0aa1da48a Mon Sep 17 00:00:00 2001
> +From: Ansuel Smith <ansuelsmth at gmail.com>
> +Date: Sun, 23 Jan 2022 00:31:49 +0100
> +Subject: [PATCH] iplink: allow to change cpu of dsa device
> +
> +Allow to change the cpu port linked to a given dsa interface.
> +This is useful in the case of multi-CPU port DSA to assign the correct
> +port to the different user ports.
> +
> +Signed-off-by: Ansuel Smith <ansuelsmth at gmail.com>
> +---
> + include/uapi/linux/if_link.h | 1 +
> + ip/iplink.c                  | 7 +++++++
> + man/man8/ip-link.8.in        | 7 +++++++
> + 3 files changed, 15 insertions(+)
> +
> +diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
> +index 41708e26..901b5544 100644
> +--- a/include/uapi/linux/if_link.h
> ++++ b/include/uapi/linux/if_link.h
> +@@ -341,6 +341,7 @@ enum {
> + 	IFLA_ALT_IFNAME, /* Alternative ifname */
> + 	IFLA_PERM_ADDRESS,
> + 	IFLA_PROTO_DOWN_REASON,
> ++	IFLA_CPU,
> + 
> + 	/* device (sysfs) name as parent, used instead
> + 	 * of IFLA_LINK where there's no parent netdev
> +diff --git a/ip/iplink.c b/ip/iplink.c
> +index a3ea775d..254c35c5 100644
> +--- a/ip/iplink.c
> ++++ b/ip/iplink.c
> +@@ -595,6 +595,7 @@ int iplink_parse(int argc, char **argv, struct iplink_req *req, char **type)
> + 	int index = 0;
> + 	int group = -1;
> + 	int addr_len = 0;
> ++	int cpu = -1;
> + 	int err;
> + 
> + 	ret = argc;
> +@@ -625,6 +626,12 @@ int iplink_parse(int argc, char **argv, struct iplink_req *req, char **type)
> + 		} else if (matches(*argv, "link") == 0) {
> + 			NEXT_ARG();
> + 			link = *argv;
> ++		} else if (matches(*argv, "cpu") == 0) {
> ++			NEXT_ARG();
> ++			cpu = ll_name_to_index(*argv);
> ++			if (!cpu)
> ++				return nodev(*argv);
> ++			addattr32(&req->n, sizeof(*req), IFLA_CPU, cpu);
> + 		} else if (matches(*argv, "address") == 0) {
> + 			NEXT_ARG();
> + 			addr_len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
> +diff --git a/man/man8/ip-link.8.in b/man/man8/ip-link.8.in
> +index 19a0c9ca..406db8ad 100644
> +--- a/man/man8/ip-link.8.in
> ++++ b/man/man8/ip-link.8.in
> +@@ -152,6 +152,9 @@ ip-link \- network device configuration
> + .br
> + .RB "[ " nomaster " ]"
> + .br
> ++.RB "[ " cpu
> ++.IR DEVICE " ]"
> ++.br
> + .RB "[ " vrf
> + .IR NAME " ]"
> + .br
> +@@ -2299,6 +2302,10 @@ set master device of the device (enslave device).
> + .BI nomaster
> + unset master device of the device (release device).
> + 
> ++.TP
> ++.BI cpu " DEVICE"
> ++set cpu device of the dsa device.
> ++
> + .TP
> + .BI addrgenmode " eui64|none|stable_secret|random"
> + set the IPv6 address generation mode
> +-- 
> +2.33.1
> +
> -- 
> 2.34.1
> 
> 
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