nfp: general representor implementation

Provide infrastructure to create and destroy representors of a given type.

Parts based on work by Bert van Leeuwen, Benjamin LaHaise,
and Jakub Kicinski.

Signed-off-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 156 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
new file mode 100644
index 000000000000..8e02f843ae92
--- /dev/null
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_repr.c
@@ -0,0 +1,156 @@
+/*
+ * Copyright (C) 2017 Netronome Systems, Inc.
+ *
+ * This software is dual licensed under the GNU General License Version 2,
+ * June 1991 as shown in the file COPYING in the top-level directory of this
+ * source tree or the BSD 2-Clause License provided below.  You have the
+ * option to license this software under the complete terms of either license.
+ *
+ * The BSD 2-Clause License:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      1. Redistributions of source code must retain the above
+ *         copyright notice, this list of conditions and the following
+ *         disclaimer.
+ *
+ *      2. Redistributions in binary form must reproduce the above
+ *         copyright notice, this list of conditions and the following
+ *         disclaimer in the documentation and/or other materials
+ *         provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/lockdep.h>
+#include <net/dst_metadata.h>
+
+#include "nfpcore/nfp_cpp.h"
+#include "nfp_app.h"
+#include "nfp_main.h"
+#include "nfp_net_repr.h"
+#include "nfp_port.h"
+
+static void nfp_repr_clean(struct nfp_repr *repr)
+{
+	unregister_netdev(repr->netdev);
+	dst_release((struct dst_entry *)repr->dst);
+	nfp_port_free(repr->port);
+}
+
+static struct lock_class_key nfp_repr_netdev_xmit_lock_key;
+static struct lock_class_key nfp_repr_netdev_addr_lock_key;
+
+static void nfp_repr_set_lockdep_class_one(struct net_device *dev,
+					   struct netdev_queue *txq,
+					   void *_unused)
+{
+	lockdep_set_class(&txq->_xmit_lock, &nfp_repr_netdev_xmit_lock_key);
+}
+
+static void nfp_repr_set_lockdep_class(struct net_device *dev)
+{
+	lockdep_set_class(&dev->addr_list_lock, &nfp_repr_netdev_addr_lock_key);
+	netdev_for_each_tx_queue(dev, nfp_repr_set_lockdep_class_one, NULL);
+}
+
+int nfp_repr_init(struct nfp_app *app, struct net_device *netdev,
+		  const struct net_device_ops *netdev_ops, u32 cmsg_port_id,
+		  struct nfp_port *port, struct net_device *pf_netdev)
+{
+	struct nfp_repr *repr = netdev_priv(netdev);
+	int err;
+
+	nfp_repr_set_lockdep_class(netdev);
+
+	repr->port = port;
+	repr->dst = metadata_dst_alloc(0, METADATA_HW_PORT_MUX, GFP_KERNEL);
+	if (!repr->dst)
+		return -ENOMEM;
+	repr->dst->u.port_info.port_id = cmsg_port_id;
+	repr->dst->u.port_info.lower_dev = pf_netdev;
+
+	netdev->netdev_ops = netdev_ops;
+
+	err = register_netdev(netdev);
+	if (err)
+		goto err_clean;
+
+	return 0;
+
+err_clean:
+	dst_release((struct dst_entry *)repr->dst);
+	return err;
+}
+
+struct net_device *nfp_repr_alloc(struct nfp_app *app)
+{
+	struct net_device *netdev;
+	struct nfp_repr *repr;
+
+	netdev = alloc_etherdev(sizeof(*repr));
+	if (!netdev)
+		return NULL;
+
+	repr = netdev_priv(netdev);
+	repr->netdev = netdev;
+	repr->app = app;
+
+	return netdev;
+}
+
+static void nfp_repr_clean_and_free(struct nfp_repr *repr)
+{
+	nfp_info(repr->app->cpp, "Destroying Representor(%s)\n",
+		 repr->netdev->name);
+	nfp_repr_clean(repr);
+	free_netdev(repr->netdev);
+}
+
+void nfp_reprs_clean_and_free(struct nfp_reprs *reprs)
+{
+	unsigned int i;
+
+	for (i = 0; i < reprs->num_reprs; i++)
+		if (reprs->reprs[i])
+			nfp_repr_clean_and_free(netdev_priv(reprs->reprs[i]));
+
+	kfree(reprs);
+}
+
+void
+nfp_reprs_clean_and_free_by_type(struct nfp_app *app,
+				 enum nfp_repr_type type)
+{
+	struct nfp_reprs *reprs;
+
+	reprs = nfp_app_reprs_set(app, type, NULL);
+	if (!reprs)
+		return;
+
+	synchronize_rcu();
+	nfp_reprs_clean_and_free(reprs);
+}
+
+struct nfp_reprs *nfp_reprs_alloc(unsigned int num_reprs)
+{
+	struct nfp_reprs *reprs;
+
+	reprs = kzalloc(sizeof(*reprs) +
+			num_reprs * sizeof(struct net_device *), GFP_KERNEL);
+	if (!reprs)
+		return NULL;
+	reprs->num_reprs = num_reprs;
+
+	return reprs;
+}