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net: dcb: add helper functions to retrieve PCP and DSCP rewrite maps 

Add two new helper functions to retrieve a mapping of priority to PCP
and DSCP bitmasks, where each bitmap contains ones in positions that
match a rewrite entry.

dcb_ieee_getrewr_prio_dscp_mask_map() reuses the dcb_ieee_app_prio_map,
as this struct is already used for a similar mapping in the app table.

Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Machon 2023-01-18 22:08:28 +01:00 committed by David S. Miller
parent 622f1b2fae
commit 1df99338e6
2 changed files with 62 additions and 0 deletions
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10
include/net/dcbnl.h
View File

@ -29,12 +29,22 @@ 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 *);
struct dcb_rewr_prio_pcp_map {
u16 map[IEEE_8021QAZ_MAX_TCS];
};
void dcb_getrewr_prio_pcp_mask_map(const struct net_device *dev,
struct dcb_rewr_prio_pcp_map *p_map);
struct dcb_ieee_app_prio_map {
u64 map[IEEE_8021QAZ_MAX_TCS];
};
void dcb_ieee_getapp_prio_dscp_mask_map(const struct net_device *dev,
struct dcb_ieee_app_prio_map *p_map);
void dcb_getrewr_prio_dscp_mask_map(const struct net_device *dev,
struct dcb_ieee_app_prio_map *p_map);
struct dcb_ieee_app_dscp_map {
u8 map[64];
};

52
net/dcb/dcbnl.c
View File

@ -2232,6 +2232,58 @@ int dcb_ieee_delapp(struct net_device *dev, struct dcb_app *del)
}
EXPORT_SYMBOL(dcb_ieee_delapp);
/* dcb_getrewr_prio_pcp_mask_map - For a given device, find mapping from
* priorities to the PCP and DEI values assigned to that priority.
*/
void dcb_getrewr_prio_pcp_mask_map(const struct net_device *dev,
struct dcb_rewr_prio_pcp_map *p_map)
{
int ifindex = dev->ifindex;
struct dcb_app_type *itr;
u8 prio;
memset(p_map->map, 0, sizeof(p_map->map));
spin_lock_bh(&dcb_lock);
list_for_each_entry(itr, &dcb_rewr_list, list) {
if (itr->ifindex == ifindex &&
itr->app.selector == DCB_APP_SEL_PCP &&
itr->app.protocol < 16 &&
itr->app.priority < IEEE_8021QAZ_MAX_TCS) {
prio = itr->app.priority;
p_map->map[prio] |= 1 << itr->app.protocol;
}
}
spin_unlock_bh(&dcb_lock);
}
EXPORT_SYMBOL(dcb_getrewr_prio_pcp_mask_map);
/* dcb_getrewr_prio_dscp_mask_map - For a given device, find mapping from
* priorities to the DSCP values assigned to that priority.
*/
void dcb_getrewr_prio_dscp_mask_map(const struct net_device *dev,
struct dcb_ieee_app_prio_map *p_map)
{
int ifindex = dev->ifindex;
struct dcb_app_type *itr;
u8 prio;
memset(p_map->map, 0, sizeof(p_map->map));
spin_lock_bh(&dcb_lock);
list_for_each_entry(itr, &dcb_rewr_list, list) {
if (itr->ifindex == ifindex &&
itr->app.selector == IEEE_8021QAZ_APP_SEL_DSCP &&
itr->app.protocol < 64 &&
itr->app.priority < IEEE_8021QAZ_MAX_TCS) {
prio = itr->app.priority;
p_map->map[prio] |= 1ULL << itr->app.protocol;
}
}
spin_unlock_bh(&dcb_lock);
}
EXPORT_SYMBOL(dcb_getrewr_prio_dscp_mask_map);
/*
* dcb_ieee_getapp_prio_dscp_mask_map - For a given device, find mapping from
* priorities to the DSCP values assigned to that priority. Initialize p_map