Commit a364c8cf authored by John Fastabend's avatar John Fastabend Committed by David S. Miller
Browse files

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: default avatarJohn Fastabend <john.r.fastabend@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f9ae7e4b

include/net/dcbnl.h

+1 −0
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ u8 dcb_setapp(struct net_device *, struct dcb_app *); 
u8 dcb_getapp(struct net_device *, struct dcb_app *);

int dcb_ieee_setapp(struct net_device *, struct dcb_app *);

int dcb_ieee_delapp(struct net_device *, struct dcb_app *);

u8 dcb_ieee_getapp_mask(struct net_device *, struct dcb_app *);



int dcbnl_notify(struct net_device *dev, int event, int cmd, u32 seq, u32 pid);

net/dcb/dcbnl.c

+26 −0
Original line number Diff line number Diff line
@@ -1928,6 +1928,32 @@ 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

 *

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