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authorFelix Fietkau <nbd@openwrt.org>2009-06-10 14:37:36 +0000
committerFelix Fietkau <nbd@openwrt.org>2009-06-10 14:37:36 +0000
commitf87baeb3e0096a43d4647f549078c53bec68543f (patch)
tree0c6d0fe3f556165e3ae85ad7867257eac0b24c8f /package/wprobe/src/user
parentcc12508ee32a954ae1296563194ede69a3063309 (diff)
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wprobe: move measurement task to the kernel, add some configurability (work in progress)
SVN-Revision: 16402
Diffstat (limited to 'package/wprobe/src/user')
-rw-r--r--package/wprobe/src/user/wprobe-info.c117
-rw-r--r--package/wprobe/src/user/wprobe.c139
-rw-r--r--package/wprobe/src/user/wprobe.h60
3 files changed, 232 insertions, 84 deletions
diff --git a/package/wprobe/src/user/wprobe-info.c b/package/wprobe/src/user/wprobe-info.c
index b891871..8361c02 100644
--- a/package/wprobe/src/user/wprobe-info.c
+++ b/package/wprobe/src/user/wprobe-info.c
@@ -64,15 +64,15 @@ wprobe_dump_value(struct wprobe_attribute *attr)
static void
-wprobe_dump_data(const char *ifname, struct list_head *gl, struct list_head *ll, struct list_head *ls)
+wprobe_dump_data(struct wprobe_iface *dev)
{
struct wprobe_attribute *attr;
struct wprobe_link *link;
bool first = true;
fprintf(stderr, "\n");
- wprobe_request_data(ifname, gl, NULL, 2);
- list_for_each_entry(attr, gl, list) {
+ wprobe_request_data(dev, NULL);
+ list_for_each_entry(attr, &dev->global_attr, list) {
fprintf(stderr, (first ?
"Global: %s=%s\n" :
" %s=%s\n"),
@@ -82,10 +82,10 @@ wprobe_dump_data(const char *ifname, struct list_head *gl, struct list_head *ll,
first = false;
}
- list_for_each_entry(link, ls, list) {
+ list_for_each_entry(link, &dev->links, list) {
first = true;
- wprobe_request_data(ifname, ll, link->addr, 2);
- list_for_each_entry(attr, ll, list) {
+ wprobe_request_data(dev, link->addr);
+ list_for_each_entry(attr, &dev->link_attr, list) {
if (first) {
fprintf(stderr,
"%02x:%02x:%02x:%02x:%02x:%02x: %s=%s\n",
@@ -119,57 +119,92 @@ static const char *attr_typestr[] = {
static int usage(const char *prog)
{
- fprintf(stderr, "Usage: %s <interface>\n", prog);
- return 1;
+ fprintf(stderr,
+ "Usage: %s <interface> [options]\n"
+ "\n"
+ "Options:\n"
+ " -c: Only apply configuration\n"
+ " -h: This help text\n"
+ " -i <interval>: Set measurement interval\n"
+ " -m: Run measurement loop\n"
+ "\n"
+ , prog);
+ exit(1);
}
-int main(int argc, char **argv)
+static void show_attributes(struct wprobe_iface *dev)
{
struct wprobe_attribute *attr;
- const char *ifname;
- LIST_HEAD(global_attr);
- LIST_HEAD(link_attr);
- LIST_HEAD(links);
- int i = 0;
+ list_for_each_entry(attr, &dev->global_attr, list) {
+ fprintf(stderr, "Global attribute: '%s' (%s)\n",
+ attr->name, attr_typestr[attr->type]);
+ }
+ list_for_each_entry(attr, &dev->link_attr, list) {
+ fprintf(stderr, "Link attribute: '%s' (%s)\n",
+ attr->name, attr_typestr[attr->type]);
+ }
+}
- if (argc < 2)
- return usage(argv[0]);
+static void loop_measurement(struct wprobe_iface *dev)
+{
+ while (1) {
+ sleep(1);
+ wprobe_update_links(dev);
+ wprobe_dump_data(dev);
+ }
+}
- ifname = argv[1];
+int main(int argc, char **argv)
+{
+ struct wprobe_iface *dev;
+ const char *ifname;
+ const char *prog = argv[0];
+ enum {
+ CMD_NONE,
+ CMD_CONFIG,
+ CMD_MEASURE,
+ } cmd = CMD_NONE;
+ int ch;
- if (wprobe_init() != 0)
- return -1;
+ if ((argc < 2) || (argv[1][0] == '-'))
+ return usage(prog);
- wprobe_dump_attributes(ifname, false, &global_attr, NULL);
- wprobe_dump_attributes(ifname, true, &link_attr, NULL);
+ ifname = argv[1];
+ dev = wprobe_get_dev(ifname);
+ argv++;
+ argc--;
- if (list_empty(&global_attr) &&
- list_empty(&link_attr)) {
+ if (!dev || (list_empty(&dev->global_attr) &&
+ list_empty(&dev->link_attr))) {
fprintf(stderr, "Interface '%s' not found\n", ifname);
return -1;
}
- list_for_each_entry(attr, &global_attr, list) {
- fprintf(stderr, "Global attribute: '%s' (%s)\n",
- attr->name, attr_typestr[attr->type]);
- }
- list_for_each_entry(attr, &link_attr, list) {
- fprintf(stderr, "Link attribute: '%s' (%s)\n",
- attr->name, attr_typestr[attr->type]);
+ while ((ch = getopt(argc, argv, "chi:m")) != -1) {
+ switch(ch) {
+ case 'c':
+ cmd = CMD_CONFIG;
+ break;
+ case 'm':
+ cmd = CMD_MEASURE;
+ break;
+ case 'i':
+ dev->interval = strtoul(optarg, NULL, 10);
+ break;
+ case 'h':
+ default:
+ usage(prog);
+ break;
+ }
}
- while (1) {
- usleep(100 * 1000);
- wprobe_measure(ifname);
-
- if (i-- > 0)
- continue;
+ wprobe_apply_config(dev);
+ if (cmd != CMD_CONFIG)
+ show_attributes(dev);
+ if (cmd == CMD_MEASURE)
+ loop_measurement(dev);
- i = 10;
- wprobe_update_links(ifname, &links);
- wprobe_dump_data(ifname, &global_attr, &link_attr, &links);
- }
- wprobe_free();
+ wprobe_free_dev(dev);
return 0;
}
diff --git a/package/wprobe/src/user/wprobe.c b/package/wprobe/src/user/wprobe.c
index 1f8df6c..e48f768 100644
--- a/package/wprobe/src/user/wprobe.c
+++ b/package/wprobe/src/user/wprobe.c
@@ -35,6 +35,7 @@
#define DPRINTF(fmt, ...) do {} while (0)
#endif
+static int n_devs = 0;
static struct nl_sock *handle = NULL;
static struct nl_cache *cache = NULL;
static struct genl_family *family = NULL;
@@ -83,9 +84,16 @@ ack_handler(struct nl_msg *msg, void *arg)
}
-void
+static void
wprobe_free(void)
{
+ /* should not happen */
+ if (n_devs == 0)
+ return;
+
+ if (--n_devs != 0)
+ return;
+
if (cache)
nl_cache_free(cache);
if (handle)
@@ -94,11 +102,14 @@ wprobe_free(void)
cache = NULL;
}
-int
+static int
wprobe_init(void)
{
int ret;
+ if (n_devs++ > 0)
+ return 0;
+
handle = nl_socket_alloc();
if (!handle) {
DPRINTF("Failed to create handle\n");
@@ -233,8 +244,8 @@ save_attribute_handler(struct nl_msg *msg, void *arg)
}
-int
-wprobe_dump_attributes(const char *ifname, bool link, struct list_head *list, char *addr)
+static int
+dump_attributes(const char *ifname, bool link, struct list_head *list, char *addr)
{
struct nl_msg *msg;
struct wprobe_attr_cb cb;
@@ -255,6 +266,64 @@ nla_put_failure:
return -EINVAL;
}
+struct wprobe_iface *
+wprobe_get_dev(const char *ifname)
+{
+ struct wprobe_iface *dev;
+
+ if (wprobe_init() != 0)
+ return NULL;
+
+ dev = malloc(sizeof(struct wprobe_iface));
+ if (!dev)
+ return NULL;
+
+ memset(dev, 0, sizeof(struct wprobe_iface));
+ dev->ifname = strdup(ifname);
+ if (!dev->ifname)
+ goto error;
+
+ dev->interval = -1;
+ dev->scale_min = -1;
+ dev->scale_max = -1;
+ dev->scale_m = -1;
+ dev->scale_d = -1;
+
+ INIT_LIST_HEAD(&dev->global_attr);
+ INIT_LIST_HEAD(&dev->link_attr);
+ INIT_LIST_HEAD(&dev->links);
+
+ dump_attributes(ifname, false, &dev->global_attr, NULL);
+ dump_attributes(ifname, true, &dev->link_attr, NULL);
+
+ return dev;
+
+error:
+ free(dev);
+ return NULL;
+}
+
+static void
+free_attr_list(struct list_head *list)
+{
+ struct wprobe_attribute *attr, *tmp;
+
+ list_for_each_entry_safe(attr, tmp, list, list) {
+ list_del(&attr->list);
+ free(attr);
+ }
+}
+
+void
+wprobe_free_dev(struct wprobe_iface *dev)
+{
+ wprobe_free();
+ free_attr_list(&dev->global_attr);
+ free_attr_list(&dev->link_attr);
+ free((void *)dev->ifname);
+ free(dev);
+}
+
static struct wprobe_link *
get_link(struct list_head *list, const char *addr)
{
@@ -313,7 +382,7 @@ save_link_handler(struct nl_msg *msg, void *arg)
int
-wprobe_update_links(const char *ifname, struct list_head *list)
+wprobe_update_links(struct wprobe_iface *dev)
{
struct wprobe_link *l, *tmp;
struct nl_msg *msg;
@@ -321,10 +390,10 @@ wprobe_update_links(const char *ifname, struct list_head *list)
int err;
INIT_LIST_HEAD(&cb.old_list);
- list_splice_init(list, &cb.old_list);
- cb.list = list;
+ list_splice_init(&dev->links, &cb.old_list);
+ cb.list = &dev->links;
- msg = wprobe_new_msg(ifname, WPROBE_CMD_GET_LINKS, true);
+ msg = wprobe_new_msg(dev->ifname, WPROBE_CMD_GET_LINKS, true);
if (!msg)
return -ENOMEM;
@@ -340,16 +409,37 @@ wprobe_update_links(const char *ifname, struct list_head *list)
return 0;
}
-void
-wprobe_measure(const char *ifname)
+int
+wprobe_apply_config(struct wprobe_iface *dev)
{
struct nl_msg *msg;
- msg = wprobe_new_msg(ifname, WPROBE_CMD_MEASURE, false);
+ msg = wprobe_new_msg(dev->ifname, WPROBE_CMD_CONFIG, false);
if (!msg)
- return;
+ return -ENOMEM;
+
+ if (dev->interval >= 0)
+ NLA_PUT_MSECS(msg, WPROBE_ATTR_INTERVAL, dev->interval);
+
+ wprobe_send_msg(msg, NULL, NULL);
+ return 0;
+
+nla_put_failure:
+ nlmsg_free(msg);
+ return -ENOMEM;
+}
+
+int
+wprobe_measure(struct wprobe_iface *dev)
+{
+ struct nl_msg *msg;
+
+ msg = wprobe_new_msg(dev->ifname, WPROBE_CMD_MEASURE, false);
+ if (!msg)
+ return -ENOMEM;
wprobe_send_msg(msg, NULL, NULL);
+ return 0;
}
struct wprobe_request_cb {
@@ -431,6 +521,10 @@ found:
if (attr->val.n > 0) {
float avg = ((float) attr->val.s) / attr->val.n;
float stdev = sqrt((((float) attr->val.ss) / attr->val.n) - (avg * avg));
+ if (isnan(stdev))
+ stdev = 0.0f;
+ if (isnan(avg))
+ avg = 0.0f;
attr->val.avg = avg;
attr->val.stdev = stdev;
}
@@ -443,25 +537,24 @@ out:
int
-wprobe_request_data(const char *ifname, struct list_head *attrs, const unsigned char *addr, int scale)
+wprobe_request_data(struct wprobe_iface *dev, const unsigned char *addr)
{
struct wprobe_request_cb cb;
+ struct list_head *attrs;
struct nl_msg *msg;
int err;
- msg = wprobe_new_msg(ifname, WPROBE_CMD_GET_INFO, true);
+ msg = wprobe_new_msg(dev->ifname, WPROBE_CMD_GET_INFO, true);
if (!msg)
return -ENOMEM;
- if (scale < 0)
- NLA_PUT_U32(msg, WPROBE_ATTR_FLAGS, WPROBE_F_RESET);
- else if (scale > 0)
- NLA_PUT_U32(msg, WPROBE_ATTR_SCALE, scale);
-
- if (addr)
+ if (addr) {
+ attrs = &dev->link_attr;
NLA_PUT(msg, WPROBE_ATTR_MAC, 6, addr);
+ } else {
+ attrs = &dev->global_attr;
+ }
-nla_put_failure:
INIT_LIST_HEAD(&cb.old_list);
list_splice_init(attrs, &cb.old_list);
cb.list = attrs;
@@ -469,6 +562,10 @@ nla_put_failure:
err = wprobe_send_msg(msg, save_attrdata_handler, &cb);
list_splice(&cb.old_list, attrs->prev);
return err;
+
+nla_put_failure:
+ nlmsg_free(msg);
+ return -ENOMEM;
}
diff --git a/package/wprobe/src/user/wprobe.h b/package/wprobe/src/user/wprobe.h
index e0c33fa..c0b4902 100644
--- a/package/wprobe/src/user/wprobe.h
+++ b/package/wprobe/src/user/wprobe.h
@@ -87,15 +87,21 @@ struct wprobe_link {
unsigned char addr[6];
};
-/**
- * wprobe_init: initialize internal data structures and connect to the wprobe netlink api
- */
-extern int wprobe_init(void);
+struct wprobe_iface {
+ const char *ifname;
+ char addr[6];
-/**
- * wprobe_free: free all internally allocated data structures
- */
-extern void wprobe_free(void);
+ struct list_head global_attr;
+ struct list_head link_attr;
+ struct list_head links;
+
+ /* config */
+ int interval;
+ int scale_min;
+ int scale_max;
+ int scale_m;
+ int scale_d;
+};
/**
* wprobe_update_links: get a list of all link partners
@@ -105,7 +111,7 @@ extern void wprobe_free(void);
* when wprobe_update_links is called multiple times, the linked list
* is updated with new link partners, old entries are automatically expired
*/
-extern int wprobe_update_links(const char *ifname, struct list_head *list);
+extern int wprobe_update_links(struct wprobe_iface *dev);
/**
* wprobe_measure: start a measurement request for all global attributes
@@ -115,29 +121,39 @@ extern int wprobe_update_links(const char *ifname, struct list_head *list);
* it may be desirable to control the sampling interval from user space
* you can use this function to do that.
*/
-extern void wprobe_measure(const char *ifname);
+extern int wprobe_measure(struct wprobe_iface *dev);
/**
- * wprobe_dump_attributes: create a linked list of available attributes
+ * wprobe_get_dev: get device information
* @ifname: name of the wprobe interface
- * @link: false: get the list of global attributes; true: get the list of per-link attributes
- * @list: linked list to store the attributes in
- * @addr: buffer to store the interface's mac address in (optional)
*
- * attributes must be freed by the caller
+ * queries the wprobe interface for all attributes
+ * must be freed with wprobe_free_dev
+ */
+extern struct wprobe_iface *wprobe_get_dev(const char *ifname);
+
+/**
+ * wprobe_get_dev: free all device information
+ * @dev: wprobe device structure
+ */
+extern void wprobe_free_dev(struct wprobe_iface *dev);
+
+/**
+ * wprobe_apply_config: apply configuration data
+ * @dev: wprobe device structure
+ *
+ * uploads all configuration values from @dev that are not set to -1
*/
-extern int wprobe_dump_attributes(const char *ifname, bool link, struct list_head *list, char *addr);
+extern int wprobe_apply_config(struct wprobe_iface *dev);
/**
* wprobe_request_data: request new sampling values for the given list of attributes
- * @ifname: name of the wprobe interface
- * @attrs: attribute list
+ * @dev: wprobe device structure
* @addr: (optional) mac address of the link partner
- * @scale: scale down values by a factor (scale < 0: reset statistics entirely)
*
- * if addr is unset, attrs must point to the list of global attributes,
- * if addr is set, attrs must point to the list of per-link attributes
+ * if addr is unset, global values are stored in the global attributes list
+ * if addr is set, per-link values for the given address are stored in the link attributes list
*/
-extern int wprobe_request_data(const char *ifname, struct list_head *attrs, const unsigned char *addr, int scale);
+extern int wprobe_request_data(struct wprobe_iface *dev, const unsigned char *addr);
#endif