Subject: [PATCH net-next 4/6] net: dcb: add helper functions to retrieve PCP and DSCP rewrite maps

From: Daniel Machon <[email-masked]>
Date: Thu, 12 Jan 2023 21:15:52 +0100

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 <[email-masked]>
---
 include/net/dcbnl.h | 10 +++++++++
 net/dcb/dcbnl.c     | 52 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+)

diff --git a/include/net/dcbnl.h b/include/net/dcbnl.h
index fe7dfb8bcb5b..42207fc44660 100644
--- a/include/net/dcbnl.h
+++ b/include/net/dcbnl.h
@@ -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];
 };
diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
index b52acf30a0bc..8a0f33df27ea 100644
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -2235,6 +2235,58 @@ 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
-- 
2.34.1