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authorJohn Fastabend <john.r.fastabend@intel.com>2011-06-21 07:34:53 +0000
committerDavid S. Miller <davem@davemloft.net>2011-06-21 16:06:12 -0700
commita364c8cf80251849bab207be8c9e66253c8ca8f8 (patch)
tree7dfeba7c78081e271b8417fdcb98fe8a475030a8 /net/dcb
parentf9ae7e4b515c4d56baf6e0e84ebee2e03ae57a25 (diff)
downloadlinux-a364c8cf80251849bab207be8c9e66253c8ca8f8.tar.gz
dcb: Add dcb_ieee_getapp_mask() for drivers to query APP settings
With multiple APP entries per selector and protocol drivers or stacks may want to pick a specific value or stripe traffic across many priorities. Also if an APP entry in use is deleted the stack/driver may want to choose from the existing APP entries. To facilitate this and avoid having duplicate code to walk the APP ring provide a routine dcb_ieee_getapp_mask() to return a u8 bitmask of all priorities set for the specified selector and protocol. This routine and bitmask is a helper for DCB kernel users. Signed-off-by: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dcb')
-rw-r--r--net/dcb/dcbnl.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
index 196084f310d..b7d0be01dcc 100644
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -1929,6 +1929,32 @@ out:
EXPORT_SYMBOL(dcb_setapp);
/**
+ * dcb_ieee_getapp_mask - retrieve the IEEE DCB application priority
+ *
+ * Helper routine which on success returns a non-zero 802.1Qaz user
+ * priority bitmap otherwise returns 0 to indicate the dcb_app was
+ * not found in APP list.
+ */
+u8 dcb_ieee_getapp_mask(struct net_device *dev, struct dcb_app *app)
+{
+ struct dcb_app_type *itr;
+ u8 prio = 0;
+
+ spin_lock(&dcb_lock);
+ list_for_each_entry(itr, &dcb_app_list, list) {
+ if (itr->app.selector == app->selector &&
+ itr->app.protocol == app->protocol &&
+ (strncmp(itr->name, dev->name, IFNAMSIZ) == 0)) {
+ prio |= 1 << itr->app.priority;
+ }
+ }
+ spin_unlock(&dcb_lock);
+
+ return prio;
+}
+EXPORT_SYMBOL(dcb_ieee_getapp_mask);
+
+/**
* dcb_ieee_setapp - add IEEE dcb application data to app list
*
* This adds Application data to the list. Multiple application