[net-next PATCH v2 4/7] dcb: Add ieee_dcb_delapp() and dcb op to delete app entry

[John Fastabend <john.r.fastabend@intel.com>]

Now that we allow multiple IEEE App entries we need a way
to remove specific entries. To do this add the ieee_dcb_delapp()
routine.

Additionaly drivers may need to remove the APP entry from
their firmware tables. Add dcb ops routine to handle this.

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
---

 include/linux/dcbnl.h |    2 +
 include/net/dcbnl.h   |    2 +
 net/dcb/dcbnl.c       |   90 ++++++++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 92 insertions(+), 2 deletions(-)

diff --git a/include/linux/dcbnl.h b/include/linux/dcbnl.h
index c522800..66a6723 100644
--- a/include/linux/dcbnl.h
+++ b/include/linux/dcbnl.h
@@ -203,6 +203,7 @@ struct dcbmsg {
  * @DCB_CMD_GFEATCFG: get DCBX features flags
  * @DCB_CMD_SFEATCFG: set DCBX features negotiation flags
  * @DCB_CMD_CEE_GET: get CEE aggregated configuration
+ * @DCB_CMD_IEEE_DEL: delete IEEE 802.1Qaz configuration
  */
 enum dcbnl_commands {
 	DCB_CMD_UNDEFINED,
@@ -246,6 +247,7 @@ enum dcbnl_commands {
 	DCB_CMD_SFEATCFG,
 
 	DCB_CMD_CEE_GET,
+	DCB_CMD_IEEE_DEL,
 
 	__DCB_CMD_ENUM_MAX,
 	DCB_CMD_MAX = __DCB_CMD_ENUM_MAX - 1,
diff --git a/include/net/dcbnl.h b/include/net/dcbnl.h
index c53a4e0..62a2685 100644
--- a/include/net/dcbnl.h
+++ b/include/net/dcbnl.h
@@ -31,6 +31,7 @@ struct dcb_app_type {
 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 *);
 
 int dcbnl_notify(struct net_device *dev, int event, int cmd, u32 seq, u32 pid);
 
@@ -46,6 +47,7 @@ struct dcbnl_rtnl_ops {
 	int (*ieee_setpfc) (struct net_device *, struct ieee_pfc *);
 	int (*ieee_getapp) (struct net_device *, struct dcb_app *);
 	int (*ieee_setapp) (struct net_device *, struct dcb_app *);
+	int (*ieee_delapp) (struct net_device *, struct dcb_app *);
 	int (*ieee_peer_getets) (struct net_device *, struct ieee_ets *);
 	int (*ieee_peer_getpfc) (struct net_device *, struct ieee_pfc *);
 
diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
index 3e3b51c..196084f 100644
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -1451,6 +1451,52 @@ static int dcbnl_ieee_get(struct net_device *netdev, struct nlattr **tb,
 
 	return err;
 }
+
+static int dcbnl_ieee_del(struct net_device *netdev, struct nlattr **tb,
+			  u32 pid, u32 seq, u16 flags)
+{
+	const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
+	struct nlattr *ieee[DCB_ATTR_IEEE_MAX + 1];
+	int err = -EOPNOTSUPP;
+
+	if (!ops)
+		return -EOPNOTSUPP;
+
+	if (!tb[DCB_ATTR_IEEE])
+		return -EINVAL;
+
+	err = nla_parse_nested(ieee, DCB_ATTR_IEEE_MAX,
+			       tb[DCB_ATTR_IEEE], dcbnl_ieee_policy);
+	if (err)
+		return err;
+
+	if (ieee[DCB_ATTR_IEEE_APP_TABLE]) {
+		struct nlattr *attr;
+		int rem;
+
+		nla_for_each_nested(attr, ieee[DCB_ATTR_IEEE_APP_TABLE], rem) {
+			struct dcb_app *app_data;
+
+			if (nla_type(attr) != DCB_ATTR_IEEE_APP)
+				continue;
+			app_data = nla_data(attr);
+			if (ops->ieee_delapp)
+				err = ops->ieee_delapp(netdev, app_data);
+			else
+				err = dcb_ieee_delapp(netdev, app_data);
+			if (err)
+				goto err;
+		}
+	}
+
+err:
+	dcbnl_reply(err, RTM_SETDCB, DCB_CMD_IEEE_DEL, DCB_ATTR_IEEE,
+		    pid, seq, flags);
+	dcbnl_notify(netdev, RTM_SETDCB, DCB_CMD_IEEE_DEL, seq, 0);
+	return err;
+}
+
+
 /* DCBX configuration */
 static int dcbnl_getdcbx(struct net_device *netdev, struct nlattr **tb,
 			 u32 pid, u32 seq, u16 flags)
@@ -1765,11 +1811,15 @@ static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 		goto out;
 	case DCB_CMD_IEEE_SET:
 		ret = dcbnl_ieee_set(netdev, tb, pid, nlh->nlmsg_seq,
-				 nlh->nlmsg_flags);
+				     nlh->nlmsg_flags);
 		goto out;
 	case DCB_CMD_IEEE_GET:
 		ret = dcbnl_ieee_get(netdev, tb, pid, nlh->nlmsg_seq,
-				 nlh->nlmsg_flags);
+				     nlh->nlmsg_flags);
+		goto out;
+	case DCB_CMD_IEEE_DEL:
+		ret = dcbnl_ieee_del(netdev, tb, pid, nlh->nlmsg_seq,
+				     nlh->nlmsg_flags);
 		goto out;
 	case DCB_CMD_GDCBX:
 		ret = dcbnl_getdcbx(netdev, tb, pid, nlh->nlmsg_seq,
@@ -1924,6 +1974,42 @@ out:
 }
 EXPORT_SYMBOL(dcb_ieee_setapp);
 
+/**
+ * dcb_ieee_delapp - delete IEEE dcb application data from list
+ *
+ * This removes a matching APP data from the APP list
+ */
+int dcb_ieee_delapp(struct net_device *dev, struct dcb_app *del)
+{
+	struct dcb_app_type *itr;
+	struct dcb_app_type event;
+	int err = -ENOENT;
+
+	memcpy(&event.name, dev->name, sizeof(event.name));
+	memcpy(&event.app, del, sizeof(event.app));
+
+	spin_lock(&dcb_lock);
+	/* Search for existing match and remove it. */
+	list_for_each_entry(itr, &dcb_app_list, list) {
+		if (itr->app.selector == del->selector &&
+		    itr->app.protocol == del->protocol &&
+		    itr->app.priority == del->priority &&
+		    (strncmp(itr->name, dev->name, IFNAMSIZ) == 0)) {
+			list_del(&itr->list);
+			kfree(itr);
+			err = 0;
+			goto out;
+		}
+	}
+
+out:
+	spin_unlock(&dcb_lock);
+	if (!err)
+		call_dcbevent_notifiers(DCB_APP_EVENT, &event);
+	return err;
+}
+EXPORT_SYMBOL(dcb_ieee_delapp);
+
 static void dcb_flushapp(void)
 {
 	struct dcb_app_type *app;