nfp: add basic action capabilities to flower offloads

Adds push vlan, pop vlan, output and drop action capabilities
to flower offloads.
Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@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

@@ -31,6 +31,7 @@ nfp-objs := \
 
 ifeq ($(CONFIG_NFP_APP_FLOWER),y)
 nfp-objs += \
+	    flower/action.o \
 	    flower/cmsg.o \
 	    flower/main.o \
 	    flower/match.o \

drivers/net/ethernet/netronome/nfp/flower/action.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/bitfield.h>
+#include <net/pkt_cls.h>
+#include <net/switchdev.h>
+#include <net/tc_act/tc_gact.h>
+#include <net/tc_act/tc_mirred.h>
+#include <net/tc_act/tc_vlan.h>
+
+#include "cmsg.h"
+#include "main.h"
+#include "../nfp_net_repr.h"
+
+static void nfp_fl_pop_vlan(struct nfp_fl_pop_vlan *pop_vlan)
+{
+	size_t act_size = sizeof(struct nfp_fl_pop_vlan);
+	u16 tmp_pop_vlan_op;
+
+	tmp_pop_vlan_op =
+		FIELD_PREP(NFP_FL_ACT_LEN_LW, act_size >> NFP_FL_LW_SIZ) |
+		FIELD_PREP(NFP_FL_ACT_JMP_ID, NFP_FL_ACTION_OPCODE_POP_VLAN);
+
+	pop_vlan->a_op = cpu_to_be16(tmp_pop_vlan_op);
+	pop_vlan->reserved = 0;
+}
+
+static void
+nfp_fl_push_vlan(struct nfp_fl_push_vlan *push_vlan,
+		 const struct tc_action *action)
+{
+	size_t act_size = sizeof(struct nfp_fl_push_vlan);
+	struct tcf_vlan *vlan = to_vlan(action);
+	u16 tmp_push_vlan_tci;
+	u16 tmp_push_vlan_op;
+
+	tmp_push_vlan_op =
+		FIELD_PREP(NFP_FL_ACT_LEN_LW, act_size >> NFP_FL_LW_SIZ) |
+		FIELD_PREP(NFP_FL_ACT_JMP_ID, NFP_FL_ACTION_OPCODE_PUSH_VLAN);
+
+	push_vlan->a_op = cpu_to_be16(tmp_push_vlan_op);
+	/* Set action push vlan parameters. */
+	push_vlan->reserved = 0;
+	push_vlan->vlan_tpid = tcf_vlan_push_proto(action);
+
+	tmp_push_vlan_tci =
+		FIELD_PREP(NFP_FL_PUSH_VLAN_PRIO, vlan->tcfv_push_prio) |
+		FIELD_PREP(NFP_FL_PUSH_VLAN_VID, vlan->tcfv_push_vid) |
+		NFP_FL_PUSH_VLAN_CFI;
+	push_vlan->vlan_tci = cpu_to_be16(tmp_push_vlan_tci);
+}
+
+static int
+nfp_fl_output(struct nfp_fl_output *output, const struct tc_action *action,
+	      struct nfp_fl_payload *nfp_flow, bool last,
+	      struct net_device *in_dev)
+{
+	size_t act_size = sizeof(struct nfp_fl_output);
+	struct net_device *out_dev;
+	u16 tmp_output_op;
+	int ifindex;
+
+	/* Set action opcode to output action. */
+	tmp_output_op =
+		FIELD_PREP(NFP_FL_ACT_LEN_LW, act_size >> NFP_FL_LW_SIZ) |
+		FIELD_PREP(NFP_FL_ACT_JMP_ID, NFP_FL_ACTION_OPCODE_OUTPUT);
+
+	output->a_op = cpu_to_be16(tmp_output_op);
+
+	/* Set action output parameters. */
+	output->flags = cpu_to_be16(last ? NFP_FL_OUT_FLAGS_LAST : 0);
+
+	ifindex = tcf_mirred_ifindex(action);
+	out_dev = __dev_get_by_index(dev_net(in_dev), ifindex);
+	if (!out_dev)
+		return -EOPNOTSUPP;
+
+	/* Only offload egress ports are on the same device as the ingress
+	 * port.
+	 */
+	if (!switchdev_port_same_parent_id(in_dev, out_dev))
+		return -EOPNOTSUPP;
+
+	output->port = cpu_to_be32(nfp_repr_get_port_id(out_dev));
+	if (!output->port)
+		return -EOPNOTSUPP;
+
+	nfp_flow->meta.shortcut = output->port;
+
+	return 0;
+}
+
+static int
+nfp_flower_loop_action(const struct tc_action *a,
+		       struct nfp_fl_payload *nfp_fl, int *a_len,
+		       struct net_device *netdev)
+{
+	struct nfp_fl_push_vlan *psh_v;
+	struct nfp_fl_pop_vlan *pop_v;
+	struct nfp_fl_output *output;
+	int err;
+
+	if (is_tcf_gact_shot(a)) {
+		nfp_fl->meta.shortcut = cpu_to_be32(NFP_FL_SC_ACT_DROP);
+	} else if (is_tcf_mirred_egress_redirect(a)) {
+		if (*a_len + sizeof(struct nfp_fl_output) > NFP_FL_MAX_A_SIZ)
+			return -EOPNOTSUPP;
+
+		output = (struct nfp_fl_output *)&nfp_fl->action_data[*a_len];
+		err = nfp_fl_output(output, a, nfp_fl, true, netdev);
+		if (err)
+			return err;
+
+		*a_len += sizeof(struct nfp_fl_output);
+	} else if (is_tcf_mirred_egress_mirror(a)) {
+		if (*a_len + sizeof(struct nfp_fl_output) > NFP_FL_MAX_A_SIZ)
+			return -EOPNOTSUPP;
+
+		output = (struct nfp_fl_output *)&nfp_fl->action_data[*a_len];
+		err = nfp_fl_output(output, a, nfp_fl, false, netdev);
+		if (err)
+			return err;
+
+		*a_len += sizeof(struct nfp_fl_output);
+	} else if (is_tcf_vlan(a) && tcf_vlan_action(a) == TCA_VLAN_ACT_POP) {
+		if (*a_len + sizeof(struct nfp_fl_pop_vlan) > NFP_FL_MAX_A_SIZ)
+			return -EOPNOTSUPP;
+
+		pop_v = (struct nfp_fl_pop_vlan *)&nfp_fl->action_data[*a_len];
+		nfp_fl->meta.shortcut = cpu_to_be32(NFP_FL_SC_ACT_POPV);
+
+		nfp_fl_pop_vlan(pop_v);
+		*a_len += sizeof(struct nfp_fl_pop_vlan);
+	} else if (is_tcf_vlan(a) && tcf_vlan_action(a) == TCA_VLAN_ACT_PUSH) {
+		if (*a_len + sizeof(struct nfp_fl_push_vlan) > NFP_FL_MAX_A_SIZ)
+			return -EOPNOTSUPP;
+
+		psh_v = (struct nfp_fl_push_vlan *)&nfp_fl->action_data[*a_len];
+		nfp_fl->meta.shortcut = cpu_to_be32(NFP_FL_SC_ACT_NULL);
+
+		nfp_fl_push_vlan(psh_v, a);
+		*a_len += sizeof(struct nfp_fl_push_vlan);
+	} else {
+		/* Currently we do not handle any other actions. */
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+int nfp_flower_compile_action(struct tc_cls_flower_offload *flow,
+			      struct net_device *netdev,
+			      struct nfp_fl_payload *nfp_flow)
+{
+	int act_len, act_cnt, err;
+	const struct tc_action *a;
+	LIST_HEAD(actions);
+
+	memset(nfp_flow->action_data, 0, NFP_FL_MAX_A_SIZ);
+	nfp_flow->meta.act_len = 0;
+	act_len = 0;
+	act_cnt = 0;
+
+	tcf_exts_to_list(flow->exts, &actions);
+	list_for_each_entry(a, &actions, list) {
+		err = nfp_flower_loop_action(a, nfp_flow, &act_len, netdev);
+		if (err)
+			return err;
+		act_cnt++;
+	}
+
+	/* We optimise when the action list is small, this can unfortunately
+	 * not happen once we have more than one action in the action list.
+	 */
+	if (act_cnt > 1)
+		nfp_flow->meta.shortcut = cpu_to_be32(NFP_FL_SC_ACT_NULL);
+
+	nfp_flow->meta.act_len = act_len;
+
+	return 0;
+}

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

@@ -56,6 +56,51 @@
 #define NFP_FLOWER_MASK_VLAN_CFI	BIT(12)
 #define NFP_FLOWER_MASK_VLAN_VID	GENMASK(11, 0)
 
+#define NFP_FL_SC_ACT_DROP		0x80000000
+#define NFP_FL_SC_ACT_USER		0x7D000000
+#define NFP_FL_SC_ACT_POPV		0x6A000000
+#define NFP_FL_SC_ACT_NULL		0x00000000
+
+/* The maximum action list size (in bytes) supported by the NFP.
+ */
+#define NFP_FL_MAX_A_SIZ		1216
+#define NFP_FL_LW_SIZ			2
+
+/* Action opcodes */
+#define NFP_FL_ACTION_OPCODE_OUTPUT	0
+#define NFP_FL_ACTION_OPCODE_PUSH_VLAN	1
+#define NFP_FL_ACTION_OPCODE_POP_VLAN	2
+#define NFP_FL_ACTION_OPCODE_NUM	32
+
+#define NFP_FL_ACT_JMP_ID		GENMASK(15, 8)
+#define NFP_FL_ACT_LEN_LW		GENMASK(7, 0)
+
+#define NFP_FL_OUT_FLAGS_LAST		BIT(15)
+#define NFP_FL_OUT_FLAGS_USE_TUN	BIT(4)
+#define NFP_FL_OUT_FLAGS_TYPE_IDX	GENMASK(2, 0)
+
+#define NFP_FL_PUSH_VLAN_PRIO		GENMASK(15, 13)
+#define NFP_FL_PUSH_VLAN_CFI		BIT(12)
+#define NFP_FL_PUSH_VLAN_VID		GENMASK(11, 0)
+
+struct nfp_fl_output {
+	__be16 a_op;
+	__be16 flags;
+	__be32 port;
+};
+
+struct nfp_fl_push_vlan {
+	__be16 a_op;
+	__be16 reserved;
+	__be16 vlan_tpid;
+	__be16 vlan_tci;
+};
+
+struct nfp_fl_pop_vlan {
+	__be16 a_op;
+	__be16 reserved;
+};
+
 /* Metadata without L2 (1W/4B)
  * ----------------------------------------------------------------
  *    3                   2                   1

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

@@ -70,5 +70,8 @@ int nfp_flower_compile_flow_match(struct tc_cls_flower_offload *flow,
 				  struct nfp_fl_key_ls *key_ls,
 				  struct net_device *netdev,
 				  struct nfp_fl_payload *nfp_flow);
+int nfp_flower_compile_action(struct tc_cls_flower_offload *flow,
+			      struct net_device *netdev,
+			      struct nfp_fl_payload *nfp_flow);
 
 #endif

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

@@ -165,10 +165,16 @@ nfp_flower_allocate_new(struct nfp_fl_key_ls *key_layer)
 	if (!flow_pay->mask_data)
 		goto err_free_unmasked;
 
+	flow_pay->action_data = kmalloc(NFP_FL_MAX_A_SIZ, GFP_KERNEL);
+	if (!flow_pay->action_data)
+		goto err_free_mask;
+
 	flow_pay->meta.flags = 0;
 
 	return flow_pay;
 
+err_free_mask:
+	kfree(flow_pay->mask_data);
 err_free_unmasked:
 	kfree(flow_pay->unmasked_data);
 err_free_flow:
@@ -212,10 +218,15 @@ nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
 	if (err)
 		goto err_destroy_flow;
 
+	err = nfp_flower_compile_action(flow, netdev, flow_pay);
+	if (err)
+		goto err_destroy_flow;
+
 	/* TODO: Complete flower_add_offload. */
 	err = -EOPNOTSUPP;
 
 err_destroy_flow:
+	kfree(flow_pay->action_data);
 	kfree(flow_pay->mask_data);
 	kfree(flow_pay->unmasked_data);
 	kfree(flow_pay);