device: add support for configuring RPS/XPS (enabled by default if available)

[project/netifd.git] / system-linux.c

diff --git a/system-linux.c b/system-linux.c
index 21385fc..9ff1532 100644 (file)
--- a/system-linux.c
+++ b/system-linux.c
@@ -51,6 +51,7 @@
 #include <fcntl.h>
 #include <glob.h>
 #include <time.h>
+#include <unistd.h>
 
 #include <netlink/msg.h>
 #include <netlink/attr.h>
@@ -1055,6 +1056,38 @@ system_if_get_settings(struct device *dev, struct device_settings *s)
        }
 }
 
+static void
+system_if_set_rps_xps_val(const char *path, int val)
+{
+       char val_buf[8];
+       glob_t gl;
+       int i;
+
+       if (glob(path, 0, NULL, &gl))
+               return;
+
+       snprintf(val_buf, sizeof(val_buf), "%x", val);
+       for (i = 0; i < gl.gl_pathc; i++)
+               system_set_sysctl(gl.gl_pathv[i], val_buf);
+}
+
+static void
+system_if_apply_rps_xps(struct device *dev, struct device_settings *s)
+{
+       long n_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+       int val;
+
+       if (n_cpus < 2)
+               return;
+
+       val = (1 << n_cpus) - 1;
+       snprintf(dev_buf, sizeof(dev_buf), "/sys/class/net/%s/queues/*/rps_cpus", dev->ifname);
+       system_if_set_rps_xps_val(dev_buf, s->rps ? val : 0);
+
+       snprintf(dev_buf, sizeof(dev_buf), "/sys/class/net/%s/queues/*/xps_cpus", dev->ifname);
+       system_if_set_rps_xps_val(dev_buf, s->xps ? val : 0);
+}
+
 void
 system_if_apply_settings(struct device *dev, struct device_settings *s, unsigned int apply_mask)
 {
@@ -1116,6 +1149,8 @@ system_if_apply_settings(struct device *dev, struct device_settings *s, unsigned
                snprintf(buf, sizeof(buf), "%d", s->neigh6reachabletime);
                system_set_neigh6reachabletime(dev, buf);
        }
+
+       system_if_apply_rps_xps(dev, s);
 }
 
 int system_if_up(struct device *dev)