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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>
This commit is contained in:
John Fastabend 2011-06-21 07:34:53 +00:00 committed by David S. Miller
parent f9ae7e4b51
commit a364c8cf80
2 changed files with 27 additions and 0 deletions
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1
include/net/dcbnl.h
View File

@ -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);

26
net/dcb/dcbnl.c
View File

@ -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
*