nfp: resync repr state when port table sync

If the NSP port table has been refreshed, resync the representor state
with the new port information. At the moment, this only entails looking
for invalid ports and killing off representors associated with them.

The repr instance becomes NULL which is safe since the app accessor
function for reprs returns NULL when it cannot access a repr.

Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 47 insertions, 0 deletions

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_repr.c b/drivers/net/ethernet/netronome/nfp/nfp_net_repr.c
index d540a9dc77b3..1bce8c131bb9 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_repr.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_repr.c
@@ -390,3 +390,50 @@ struct nfp_reprs *nfp_reprs_alloc(unsigned int num_reprs)
 
 	return reprs;
 }
+
+int nfp_reprs_resync_phys_ports(struct nfp_app *app)
+{
+	struct nfp_reprs *reprs, *old_reprs;
+	struct nfp_repr *repr;
+	int i;
+
+	old_reprs =
+		rcu_dereference_protected(app->reprs[NFP_REPR_TYPE_PHYS_PORT],
+					  lockdep_is_held(&app->pf->lock));
+	if (!old_reprs)
+		return 0;
+
+	reprs = nfp_reprs_alloc(old_reprs->num_reprs);
+	if (!reprs)
+		return -ENOMEM;
+
+	for (i = 0; i < old_reprs->num_reprs; i++) {
+		if (!old_reprs->reprs[i])
+			continue;
+
+		repr = netdev_priv(old_reprs->reprs[i]);
+		if (repr->port->type == NFP_PORT_INVALID)
+			continue;
+
+		reprs->reprs[i] = old_reprs->reprs[i];
+	}
+
+	old_reprs = nfp_app_reprs_set(app, NFP_REPR_TYPE_PHYS_PORT, reprs);
+	synchronize_rcu();
+
+	/* Now we free up removed representors */
+	for (i = 0; i < old_reprs->num_reprs; i++) {
+		if (!old_reprs->reprs[i])
+			continue;
+
+		repr = netdev_priv(old_reprs->reprs[i]);
+		if (repr->port->type != NFP_PORT_INVALID)
+			continue;
+
+		nfp_app_repr_stop(app, repr);
+		nfp_repr_clean(repr);
+	}
+
+	kfree(old_reprs);
+	return 0;
+}