nfp: offload flower vxlan endpoint MAC addresses

Generate a list of MAC addresses of netdevs that could be used as VXLAN
tunnel end points. Give offloaded MACs an index for storage on the NFP in
the ranges:
0x100-0x1ff physical port representors
0x200-0x2ff VF port representors
0x300-0x3ff other offloads (e.g. vxlan netdevs, ovs bridges)

Assign phys and vf indexes based on unique 8 bit values in the port num.
Maintain list of other netdevs to ensure same netdev is not offloaded
twice and each gets a unique ID without exhausting the entries. Because
the IDs are unique but constant for a netdev, any changes are implemented
by overwriting the index on NFP.
Signed-off-by: John Hurley <john.hurley@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/Makefile

@@ -37,7 +37,8 @@ nfp-objs += \
 	    flower/main.o \
 	    flower/match.o \
 	    flower/metadata.o \
-	    flower/offload.o
+	    flower/offload.o \
+	    flower/tunnel_conf.o
 endif
 
 ifeq ($(CONFIG_BPF_SYSCALL),y)

drivers/net/ethernet/netronome/nfp/flower/cmsg.c

@@ -38,17 +38,10 @@
 #include <net/dst_metadata.h>
 
 #include "main.h"
-#include "../nfpcore/nfp_cpp.h"
 #include "../nfp_net.h"
 #include "../nfp_net_repr.h"
 #include "./cmsg.h"
 
-#define nfp_flower_cmsg_warn(app, fmt, args...)				\
-	do {								\
-		if (net_ratelimit())					\
-			nfp_warn((app)->cpp, fmt, ## args);		\
-	} while (0)
-
 static struct nfp_flower_cmsg_hdr *
 nfp_flower_cmsg_get_hdr(struct sk_buff *skb)
 {

drivers/net/ethernet/netronome/nfp/flower/cmsg.h

@@ -39,6 +39,7 @@
 #include <linux/types.h>
 
 #include "../nfp_app.h"
+#include "../nfpcore/nfp_cpp.h"
 
 #define NFP_FLOWER_LAYER_META		BIT(0)
 #define NFP_FLOWER_LAYER_PORT		BIT(1)
@@ -90,6 +91,12 @@
 #define NFP_FL_IPV4_TUNNEL_TYPE		GENMASK(7, 4)
 #define NFP_FL_IPV4_PRE_TUN_INDEX	GENMASK(2, 0)
 
+#define nfp_flower_cmsg_warn(app, fmt, args...)                         \
+	do {                                                            \
+		if (net_ratelimit())                                    \
+			nfp_warn((app)->cpp, fmt, ## args);             \
+	} while (0)
+
 enum nfp_flower_tun_type {
 	NFP_FL_TUNNEL_NONE =	0,
 	NFP_FL_TUNNEL_VXLAN =	2,
@@ -310,6 +317,7 @@ enum nfp_flower_cmsg_type_port {
 	NFP_FLOWER_CMSG_TYPE_FLOW_DEL =		2,
 	NFP_FLOWER_CMSG_TYPE_MAC_REPR =		7,
 	NFP_FLOWER_CMSG_TYPE_PORT_MOD =		8,
+	NFP_FLOWER_CMSG_TYPE_TUN_MAC =		11,
 	NFP_FLOWER_CMSG_TYPE_FLOW_STATS =	15,
 	NFP_FLOWER_CMSG_TYPE_PORT_ECHO =	16,
 	NFP_FLOWER_CMSG_TYPE_MAX =		32,
@@ -343,6 +351,7 @@ enum nfp_flower_cmsg_port_type {
 	NFP_FLOWER_CMSG_PORT_TYPE_UNSPEC =	0x0,
 	NFP_FLOWER_CMSG_PORT_TYPE_PHYS_PORT =	0x1,
 	NFP_FLOWER_CMSG_PORT_TYPE_PCIE_PORT =	0x2,
+	NFP_FLOWER_CMSG_PORT_TYPE_OTHER_PORT =  0x3,
 };
 
 enum nfp_flower_cmsg_port_vnic_type {

drivers/net/ethernet/netronome/nfp/flower/main.c

@@ -436,6 +436,16 @@ static void nfp_flower_clean(struct nfp_app *app)
 	app->priv = NULL;
 }
 
+static int nfp_flower_start(struct nfp_app *app)
+{
+	return nfp_tunnel_config_start(app);
+}
+
+static void nfp_flower_stop(struct nfp_app *app)
+{
+	nfp_tunnel_config_stop(app);
+}
+
 const struct nfp_app_type app_flower = {
 	.id		= NFP_APP_FLOWER_NIC,
 	.name		= "flower",
@@ -453,6 +463,9 @@ const struct nfp_app_type app_flower = {
 	.repr_open	= nfp_flower_repr_netdev_open,
 	.repr_stop	= nfp_flower_repr_netdev_stop,
 
+	.start		= nfp_flower_start,
+	.stop		= nfp_flower_stop,
+
 	.ctrl_msg_rx	= nfp_flower_cmsg_rx,
 
 	.sriov_enable	= nfp_flower_sriov_enable,

drivers/net/ethernet/netronome/nfp/flower/main.h

@@ -84,6 +84,13 @@ struct nfp_fl_stats_id {
  * @flow_table:		Hash table used to store flower rules
  * @cmsg_work:		Workqueue for control messages processing
  * @cmsg_skbs:		List of skbs for control message processing
+ * @nfp_mac_off_list:	List of MAC addresses to offload
+ * @nfp_mac_index_list:	List of unique 8-bit indexes for non NFP netdevs
+ * @nfp_mac_off_lock:	Lock for the MAC address list
+ * @nfp_mac_index_lock:	Lock for the MAC index list
+ * @nfp_mac_off_ids:	IDA to manage id assignment for offloaded macs
+ * @nfp_mac_off_count:	Number of MACs in address list
+ * @nfp_tun_mac_nb:	Notifier to monitor link state
  */
 struct nfp_flower_priv {
 	struct nfp_app *app;
@@ -96,6 +103,13 @@ struct nfp_flower_priv {
 	DECLARE_HASHTABLE(flow_table, NFP_FLOWER_HASH_BITS);
 	struct work_struct cmsg_work;
 	struct sk_buff_head cmsg_skbs;
+	struct list_head nfp_mac_off_list;
+	struct list_head nfp_mac_index_list;
+	struct mutex nfp_mac_off_lock;
+	struct mutex nfp_mac_index_lock;
+	struct ida nfp_mac_off_ids;
+	int nfp_mac_off_count;
+	struct notifier_block nfp_tun_mac_nb;
 };
 
 struct nfp_fl_key_ls {
@@ -165,4 +179,8 @@ nfp_flower_remove_fl_table(struct nfp_app *app, unsigned long tc_flower_cookie);
 
 void nfp_flower_rx_flow_stats(struct nfp_app *app, struct sk_buff *skb);
 
+int nfp_tunnel_config_start(struct nfp_app *app);
+void nfp_tunnel_config_stop(struct nfp_app *app);
+void nfp_tunnel_write_macs(struct nfp_app *app);
+
 #endif

drivers/net/ethernet/netronome/nfp/flower/match.c

@@ -232,6 +232,7 @@ int nfp_flower_compile_flow_match(struct tc_cls_flower_offload *flow,
 				  struct nfp_fl_payload *nfp_flow)
 {
 	enum nfp_flower_tun_type tun_type = NFP_FL_TUNNEL_NONE;
+	struct nfp_repr *netdev_repr;
 	int err;
 	u8 *ext;
 	u8 *msk;
@@ -341,6 +342,12 @@ int nfp_flower_compile_flow_match(struct tc_cls_flower_offload *flow,
 					 flow, true);
 		ext += sizeof(struct nfp_flower_vxlan);
 		msk += sizeof(struct nfp_flower_vxlan);
+
+		/* Configure tunnel end point MAC. */
+		if (nfp_netdev_is_nfp_repr(netdev)) {
+			netdev_repr = netdev_priv(netdev);
+			nfp_tunnel_write_macs(netdev_repr->app);
+		}
 	}
 
 	return 0;

drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c

+/*
+ * 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/idr.h>
+#include <net/dst_metadata.h>
+
+#include "cmsg.h"
+#include "main.h"
+#include "../nfp_net_repr.h"
+#include "../nfp_net.h"
+
+/**
+ * struct nfp_tun_mac_addr - configure MAC address of tunnel EP on NFP
+ * @reserved:	reserved for future use
+ * @count:	number of MAC addresses in the message
+ * @index:	index of MAC address in the lookup table
+ * @addr:	interface MAC address
+ * @addresses:	series of MACs to offload
+ */
+struct nfp_tun_mac_addr {
+	__be16 reserved;
+	__be16 count;
+	struct index_mac_addr {
+		__be16 index;
+		u8 addr[ETH_ALEN];
+	} addresses[];
+};
+
+/**
+ * struct nfp_tun_mac_offload_entry - list of MACs to offload
+ * @index:	index of MAC address for offloading
+ * @addr:	interface MAC address
+ * @list:	list pointer
+ */
+struct nfp_tun_mac_offload_entry {
+	__be16 index;
+	u8 addr[ETH_ALEN];
+	struct list_head list;
+};
+
+#define NFP_MAX_MAC_INDEX       0xff
+
+/**
+ * struct nfp_tun_mac_non_nfp_idx - converts non NFP netdev ifindex to 8-bit id
+ * @ifindex:	netdev ifindex of the device
+ * @index:	index of netdevs mac on NFP
+ * @list:	list pointer
+ */
+struct nfp_tun_mac_non_nfp_idx {
+	int ifindex;
+	u8 index;
+	struct list_head list;
+};
+
+static bool nfp_tun_is_netdev_to_offload(struct net_device *netdev)
+{
+	if (!netdev->rtnl_link_ops)
+		return false;
+	if (!strcmp(netdev->rtnl_link_ops->kind, "openvswitch"))
+		return true;
+	if (!strcmp(netdev->rtnl_link_ops->kind, "vxlan"))
+		return true;
+
+	return false;
+}
+
+static int
+nfp_flower_xmit_tun_conf(struct nfp_app *app, u8 mtype, u16 plen, void *pdata)
+{
+	struct sk_buff *skb;
+	unsigned char *msg;
+
+	skb = nfp_flower_cmsg_alloc(app, plen, mtype);
+	if (!skb)
+		return -ENOMEM;
+
+	msg = nfp_flower_cmsg_get_data(skb);
+	memcpy(msg, pdata, nfp_flower_cmsg_get_data_len(skb));
+
+	nfp_ctrl_tx(app->ctrl, skb);
+	return 0;
+}
+
+void nfp_tunnel_write_macs(struct nfp_app *app)
+{
+	struct nfp_flower_priv *priv = app->priv;
+	struct nfp_tun_mac_offload_entry *entry;
+	struct nfp_tun_mac_addr *payload;
+	struct list_head *ptr, *storage;
+	int mac_count, err, pay_size;
+
+	mutex_lock(&priv->nfp_mac_off_lock);
+	if (!priv->nfp_mac_off_count) {
+		mutex_unlock(&priv->nfp_mac_off_lock);
+		return;
+	}
+
+	pay_size = sizeof(struct nfp_tun_mac_addr) +
+		   sizeof(struct index_mac_addr) * priv->nfp_mac_off_count;
+
+	payload = kzalloc(pay_size, GFP_KERNEL);
+	if (!payload) {
+		mutex_unlock(&priv->nfp_mac_off_lock);
+		return;
+	}
+
+	payload->count = cpu_to_be16(priv->nfp_mac_off_count);
+
+	mac_count = 0;
+	list_for_each_safe(ptr, storage, &priv->nfp_mac_off_list) {
+		entry = list_entry(ptr, struct nfp_tun_mac_offload_entry,
+				   list);
+		payload->addresses[mac_count].index = entry->index;
+		ether_addr_copy(payload->addresses[mac_count].addr,
+				entry->addr);
+		mac_count++;
+	}
+
+	err = nfp_flower_xmit_tun_conf(app, NFP_FLOWER_CMSG_TYPE_TUN_MAC,
+				       pay_size, payload);
+
+	kfree(payload);
+
+	if (err) {
+		mutex_unlock(&priv->nfp_mac_off_lock);
+		/* Write failed so retain list for future retry. */
+		return;
+	}
+
+	/* If list was successfully offloaded, flush it. */
+	list_for_each_safe(ptr, storage, &priv->nfp_mac_off_list) {
+		entry = list_entry(ptr, struct nfp_tun_mac_offload_entry,
+				   list);
+		list_del(&entry->list);
+		kfree(entry);
+	}
+
+	priv->nfp_mac_off_count = 0;
+	mutex_unlock(&priv->nfp_mac_off_lock);
+}
+
+static int nfp_tun_get_mac_idx(struct nfp_app *app, int ifindex)
+{
+	struct nfp_flower_priv *priv = app->priv;
+	struct nfp_tun_mac_non_nfp_idx *entry;
+	struct list_head *ptr, *storage;
+	int idx;
+
+	mutex_lock(&priv->nfp_mac_index_lock);
+	list_for_each_safe(ptr, storage, &priv->nfp_mac_index_list) {
+		entry = list_entry(ptr, struct nfp_tun_mac_non_nfp_idx, list);
+		if (entry->ifindex == ifindex) {
+			idx = entry->index;
+			mutex_unlock(&priv->nfp_mac_index_lock);
+			return idx;
+		}
+	}
+
+	idx = ida_simple_get(&priv->nfp_mac_off_ids, 0,
+			     NFP_MAX_MAC_INDEX, GFP_KERNEL);
+	if (idx < 0) {
+		mutex_unlock(&priv->nfp_mac_index_lock);
+		return idx;
+	}
+
+	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+	if (!entry) {
+		mutex_unlock(&priv->nfp_mac_index_lock);
+		return -ENOMEM;
+	}
+	entry->ifindex = ifindex;
+	entry->index = idx;
+	list_add_tail(&entry->list, &priv->nfp_mac_index_list);
+	mutex_unlock(&priv->nfp_mac_index_lock);
+
+	return idx;
+}
+
+static void nfp_tun_del_mac_idx(struct nfp_app *app, int ifindex)
+{
+	struct nfp_flower_priv *priv = app->priv;
+	struct nfp_tun_mac_non_nfp_idx *entry;
+	struct list_head *ptr, *storage;
+
+	mutex_lock(&priv->nfp_mac_index_lock);
+	list_for_each_safe(ptr, storage, &priv->nfp_mac_index_list) {
+		entry = list_entry(ptr, struct nfp_tun_mac_non_nfp_idx, list);
+		if (entry->ifindex == ifindex) {
+			ida_simple_remove(&priv->nfp_mac_off_ids,
+					  entry->index);
+			list_del(&entry->list);
+			kfree(entry);
+			break;
+		}
+	}
+	mutex_unlock(&priv->nfp_mac_index_lock);
+}
+
+static void nfp_tun_add_to_mac_offload_list(struct net_device *netdev,
+					    struct nfp_app *app)
+{
+	struct nfp_flower_priv *priv = app->priv;
+	struct nfp_tun_mac_offload_entry *entry;
+	u16 nfp_mac_idx;
+	int port = 0;
+
+	/* Check if MAC should be offloaded. */
+	if (!is_valid_ether_addr(netdev->dev_addr))
+		return;
+
+	if (nfp_netdev_is_nfp_repr(netdev))
+		port = nfp_repr_get_port_id(netdev);
+	else if (!nfp_tun_is_netdev_to_offload(netdev))
+		return;
+
+	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+	if (!entry) {
+		nfp_flower_cmsg_warn(app, "Mem fail when offloading MAC.\n");
+		return;
+	}
+
+	if (FIELD_GET(NFP_FLOWER_CMSG_PORT_TYPE, port) ==
+	    NFP_FLOWER_CMSG_PORT_TYPE_PHYS_PORT) {
+		nfp_mac_idx = port << 8 | NFP_FLOWER_CMSG_PORT_TYPE_PHYS_PORT;
+	} else if (FIELD_GET(NFP_FLOWER_CMSG_PORT_TYPE, port) ==
+		   NFP_FLOWER_CMSG_PORT_TYPE_PCIE_PORT) {
+		port = FIELD_GET(NFP_FLOWER_CMSG_PORT_VNIC, port);
+		nfp_mac_idx = port << 8 | NFP_FLOWER_CMSG_PORT_TYPE_PCIE_PORT;
+	} else {
+		/* Must assign our own unique 8-bit index. */
+		int idx = nfp_tun_get_mac_idx(app, netdev->ifindex);
+
+		if (idx < 0) {
+			nfp_flower_cmsg_warn(app, "Can't assign non-repr MAC index.\n");
+			kfree(entry);
+			return;
+		}
+		nfp_mac_idx = idx << 8 | NFP_FLOWER_CMSG_PORT_TYPE_OTHER_PORT;
+	}
+
+	entry->index = cpu_to_be16(nfp_mac_idx);
+	ether_addr_copy(entry->addr, netdev->dev_addr);
+
+	mutex_lock(&priv->nfp_mac_off_lock);
+	priv->nfp_mac_off_count++;
+	list_add_tail(&entry->list, &priv->nfp_mac_off_list);
+	mutex_unlock(&priv->nfp_mac_off_lock);
+}
+
+static int nfp_tun_mac_event_handler(struct notifier_block *nb,
+				     unsigned long event, void *ptr)
+{
+	struct nfp_flower_priv *app_priv;
+	struct net_device *netdev;
+	struct nfp_app *app;
+
+	if (event == NETDEV_DOWN || event == NETDEV_UNREGISTER) {
+		app_priv = container_of(nb, struct nfp_flower_priv,
+					nfp_tun_mac_nb);
+		app = app_priv->app;
+		netdev = netdev_notifier_info_to_dev(ptr);
+
+		/* If non-nfp netdev then free its offload index. */
+		if (nfp_tun_is_netdev_to_offload(netdev))
+			nfp_tun_del_mac_idx(app, netdev->ifindex);
+	} else if (event == NETDEV_UP || event == NETDEV_CHANGEADDR ||
+		   event == NETDEV_REGISTER) {
+		app_priv = container_of(nb, struct nfp_flower_priv,
+					nfp_tun_mac_nb);
+		app = app_priv->app;
+		netdev = netdev_notifier_info_to_dev(ptr);
+
+		nfp_tun_add_to_mac_offload_list(netdev, app);
+
+		/* Force a list write to keep NFP up to date. */
+		nfp_tunnel_write_macs(app);
+	}
+	return NOTIFY_OK;
+}
+
+int nfp_tunnel_config_start(struct nfp_app *app)
+{
+	struct nfp_flower_priv *priv = app->priv;
+	struct net_device *netdev;
+	int err;
+
+	/* Initialise priv data for MAC offloading. */
+	priv->nfp_mac_off_count = 0;
+	mutex_init(&priv->nfp_mac_off_lock);
+	INIT_LIST_HEAD(&priv->nfp_mac_off_list);
+	priv->nfp_tun_mac_nb.notifier_call = nfp_tun_mac_event_handler;
+	mutex_init(&priv->nfp_mac_index_lock);
+	INIT_LIST_HEAD(&priv->nfp_mac_index_list);
+	ida_init(&priv->nfp_mac_off_ids);
+
+	err = register_netdevice_notifier(&priv->nfp_tun_mac_nb);
+	if (err)
+		goto err_free_mac_ida;
+
+	/* Parse netdevs already registered for MACs that need offloaded. */
+	rtnl_lock();
+	for_each_netdev(&init_net, netdev)
+		nfp_tun_add_to_mac_offload_list(netdev, app);
+	rtnl_unlock();
+
+	return 0;
+
+err_free_mac_ida:
+	ida_destroy(&priv->nfp_mac_off_ids);
+	return err;
+}
+
+void nfp_tunnel_config_stop(struct nfp_app *app)
+{
+	struct nfp_tun_mac_offload_entry *mac_entry;
+	struct nfp_flower_priv *priv = app->priv;
+	struct nfp_tun_mac_non_nfp_idx *mac_idx;
+	struct list_head *ptr, *storage;
+
+	unregister_netdevice_notifier(&priv->nfp_tun_mac_nb);
+
+	/* Free any memory that may be occupied by MAC list. */
+	mutex_lock(&priv->nfp_mac_off_lock);
+	list_for_each_safe(ptr, storage, &priv->nfp_mac_off_list) {
+		mac_entry = list_entry(ptr, struct nfp_tun_mac_offload_entry,
+				       list);
+		list_del(&mac_entry->list);
+		kfree(mac_entry);
+	}
+	mutex_unlock(&priv->nfp_mac_off_lock);
+
+	/* Free any memory that may be occupied by MAC index list. */
+	mutex_lock(&priv->nfp_mac_index_lock);
+	list_for_each_safe(ptr, storage, &priv->nfp_mac_index_list) {
+		mac_idx = list_entry(ptr, struct nfp_tun_mac_non_nfp_idx,
+				     list);
+		list_del(&mac_idx->list);
+		kfree(mac_idx);
+	}
+	mutex_unlock(&priv->nfp_mac_index_lock);
+
+	ida_destroy(&priv->nfp_mac_off_ids);
+}