[RFC PATCH v2 2/2] iproute2: add support for cpu set

[Ansuel Smith]

Add support for cpu set useful to set CPU port for dsa devices.

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
+@@ -279,6 +279,7 @@ enum {
+ 	IFLA_BROADCAST,
+ 	IFLA_IFNAME,
+ 	IFLA_MTU,
++	IFLA_CPU,
+ 	IFLA_LINK,
+ 	IFLA_QDISC,
+ 	IFLA_STATS,
+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
+
-- 
2.33.1