nfp: abm: add initial active buffer management NIC skeleton

Add a very rudimentary active buffer management NIC support.
For now it's like a core NIC without SR-IOV support.  Next
commits will extend its functionality.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/Kconfig

@@ -36,6 +36,19 @@ config NFP_APP_FLOWER
 	  either directly, with Open vSwitch, or any other way.  Note that
 	  TC Flower offload requires specific FW to work.
 
+config NFP_APP_ABM_NIC
+	bool "NFP4000/NFP6000 Advanced buffer management NIC support"
+	depends on NFP
+	depends on NET_SWITCHDEV
+	default y
+	help
+	  Enable driver support for Advanced buffer management NIC on NFP.
+	  ABM NIC allows advanced configuration of queuing and scheduling
+	  of packets, including ECN marking. Say Y, if you are planning to
+	  use one of the NFP4000 and NFP6000 platforms which support this
+	  functionality.
+	  Code will be built into the nfp.ko driver.
+
 config NFP_DEBUG
 	bool "Debug support for Netronome(R) NFP4000/NFP6000 NIC drivers"
 	depends on NFP

drivers/net/ethernet/netronome/nfp/Makefile

@@ -53,4 +53,9 @@ nfp-objs += \
 	    bpf/jit.o
 endif
 
+ifeq ($(CONFIG_NFP_APP_ABM_NIC),y)
+nfp-objs += \
+	    abm/main.o
+endif
+
 nfp-$(CONFIG_NFP_DEBUG) += nfp_net_debugfs.o

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

+// SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+/*
+ * Copyright (C) 2018 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 "../nfpcore/nfp_cpp.h"
+#include "../nfpcore/nfp_nsp.h"
+#include "../nfp_app.h"
+#include "../nfp_main.h"
+#include "main.h"
+
+static int nfp_abm_init(struct nfp_app *app)
+{
+	struct nfp_pf *pf = app->pf;
+	struct nfp_abm *abm;
+
+	if (!pf->eth_tbl) {
+		nfp_err(pf->cpp, "ABM NIC requires ETH table\n");
+		return -EINVAL;
+	}
+	if (pf->max_data_vnics != pf->eth_tbl->count) {
+		nfp_err(pf->cpp, "ETH entries don't match vNICs (%d vs %d)\n",
+			pf->max_data_vnics, pf->eth_tbl->count);
+		return -EINVAL;
+	}
+	if (!pf->mac_stats_bar) {
+		nfp_warn(app->cpp, "ABM NIC requires mac_stats symbol\n");
+		return -EINVAL;
+	}
+
+	abm = kzalloc(sizeof(*abm), GFP_KERNEL);
+	if (!abm)
+		return -ENOMEM;
+	app->priv = abm;
+	abm->app = app;
+
+	return 0;
+}
+
+static void nfp_abm_clean(struct nfp_app *app)
+{
+	struct nfp_abm *abm = app->priv;
+
+	kfree(abm);
+	app->priv = NULL;
+}
+
+const struct nfp_app_type app_abm = {
+	.id		= NFP_APP_ACTIVE_BUFFER_MGMT_NIC,
+	.name		= "abm",
+
+	.init		= nfp_abm_init,
+	.clean		= nfp_abm_clean,
+
+	.vnic_alloc	= nfp_app_nic_vnic_alloc,
+};

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

+/* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
+/*
+ * Copyright (C) 2018 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.
+ */
+
+#ifndef __NFP_ABM_H__
+#define __NFP_ABM_H__ 1
+
+struct nfp_app;
+
+/**
+ * struct nfp_abm - ABM NIC app structure
+ * @app:	back pointer to nfp_app
+ */
+struct nfp_abm {
+	struct nfp_app *app;
+};
+#endif

drivers/net/ethernet/netronome/nfp/nfp_app.c

@@ -54,6 +54,9 @@ static const struct nfp_app_type *apps[] = {
 #ifdef CONFIG_NFP_APP_FLOWER
 	[NFP_APP_FLOWER_NIC]	= &app_flower,
 #endif
+#ifdef CONFIG_NFP_APP_ABM_NIC
+	[NFP_APP_ACTIVE_BUFFER_MGMT_NIC] = &app_abm,
+#endif
 };
 
 struct nfp_app *nfp_app_from_netdev(struct net_device *netdev)

drivers/net/ethernet/netronome/nfp/nfp_app.h

@@ -57,11 +57,13 @@ enum nfp_app_id {
 	NFP_APP_CORE_NIC	= 0x1,
 	NFP_APP_BPF_NIC		= 0x2,
 	NFP_APP_FLOWER_NIC	= 0x3,
+	NFP_APP_ACTIVE_BUFFER_MGMT_NIC = 0x4,
 };
 
 extern const struct nfp_app_type app_nic;
 extern const struct nfp_app_type app_bpf;
 extern const struct nfp_app_type app_flower;
+extern const struct nfp_app_type app_abm;
 
 /**
  * struct nfp_app_type - application definition