1 files changed, 371 insertions, 0 deletions
diff --git a/drivers/net/ethernet/microchip/vcap/vcap_api.c b/drivers/net/ethernet/microchip/vcap/vcap_api.c
new file mode 100644
index 000000000000..3eb8aa237c8e
--- /dev/null
+++ b/drivers/net/ethernet/microchip/vcap/vcap_api.c
@@ -0,0 +1,371 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* Microchip VCAP API
+ *
+ * Copyright (c) 2022 Microchip Technology Inc. and its subsidiaries.
+ */
+
+#include <linux/types.h>
+
+#include "vcap_api.h"
+#include "vcap_api_client.h"
+
+#define to_intrule(rule) container_of((rule), struct vcap_rule_internal, data)
+
+/* Private VCAP API rule data */
+struct vcap_rule_internal {
+	struct vcap_rule data; /* provided by the client */
+	struct list_head list; /* for insertion in the vcap admin list of rules */
+	struct vcap_admin *admin; /* vcap hw instance */
+	struct net_device *ndev;  /* the interface that the rule applies to */
+	struct vcap_control *vctrl; /* the client control */
+	u32 addr; /* address in the VCAP at insertion */
+};
+
+/* Update the keyset for the rule */
+int vcap_set_rule_set_keyset(struct vcap_rule *rule,
+			     enum vcap_keyfield_set keyset)
+{
+	/* This will be expanded with more information later */
+	rule->keyset = keyset;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(vcap_set_rule_set_keyset);
+
+/* Update the actionset for the rule */
+int vcap_set_rule_set_actionset(struct vcap_rule *rule,
+				enum vcap_actionfield_set actionset)
+{
+	/* This will be expanded with more information later */
+	rule->actionset = actionset;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(vcap_set_rule_set_actionset);
+
+/* Find a rule with a provided rule id */
+static struct vcap_rule_internal *vcap_lookup_rule(struct vcap_control *vctrl,
+						   u32 id)
+{
+	struct vcap_rule_internal *ri;
+	struct vcap_admin *admin;
+
+	/* Look for the rule id in all vcaps */
+	list_for_each_entry(admin, &vctrl->list, list)
+		list_for_each_entry(ri, &admin->rules, list)
+			if (ri->data.id == id)
+				return ri;
+	return NULL;
+}
+
+/* Find a rule id with a provided cookie */
+int vcap_lookup_rule_by_cookie(struct vcap_control *vctrl, u64 cookie)
+{
+	struct vcap_rule_internal *ri;
+	struct vcap_admin *admin;
+
+	/* Look for the rule id in all vcaps */
+	list_for_each_entry(admin, &vctrl->list, list)
+		list_for_each_entry(ri, &admin->rules, list)
+			if (ri->data.cookie == cookie)
+				return ri->data.id;
+	return -ENOENT;
+}
+EXPORT_SYMBOL_GPL(vcap_lookup_rule_by_cookie);
+
+/* Lookup a vcap instance using chain id */
+struct vcap_admin *vcap_find_admin(struct vcap_control *vctrl, int cid)
+{
+	struct vcap_admin *admin;
+
+	list_for_each_entry(admin, &vctrl->list, list) {
+		if (cid >= admin->first_cid && cid <= admin->last_cid)
+			return admin;
+	}
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(vcap_find_admin);
+
+/* Validate a rule with respect to available port keys */
+int vcap_val_rule(struct vcap_rule *rule, u16 l3_proto)
+{
+	struct vcap_rule_internal *ri = to_intrule(rule);
+
+	/* This validation will be much expanded later */
+	if (!ri->admin) {
+		ri->data.exterr = VCAP_ERR_NO_ADMIN;
+		return -EINVAL;
+	}
+	if (!ri->ndev) {
+		ri->data.exterr = VCAP_ERR_NO_NETDEV;
+		return -EINVAL;
+	}
+	if (ri->data.keyset == VCAP_KFS_NO_VALUE) {
+		ri->data.exterr = VCAP_ERR_NO_KEYSET_MATCH;
+		return -EINVAL;
+	}
+	if (ri->data.actionset == VCAP_AFS_NO_VALUE) {
+		ri->data.exterr = VCAP_ERR_NO_ACTIONSET_MATCH;
+		return -EINVAL;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(vcap_val_rule);
+
+/* Assign a unique rule id and autogenerate one if id == 0 */
+static u32 vcap_set_rule_id(struct vcap_rule_internal *ri)
+{
+	u32 next_id;
+
+	if (ri->data.id != 0)
+		return ri->data.id;
+
+	next_id = ri->vctrl->rule_id + 1;
+
+	for (next_id = ri->vctrl->rule_id + 1; next_id < ~0; ++next_id) {
+		if (!vcap_lookup_rule(ri->vctrl, next_id)) {
+			ri->data.id = next_id;
+			ri->vctrl->rule_id = next_id;
+			break;
+		}
+	}
+	return ri->data.id;
+}
+
+/* Encode and write a validated rule to the VCAP */
+int vcap_add_rule(struct vcap_rule *rule)
+{
+	/* This will later handling the encode and writing of the rule */
+	return 0;
+}
+EXPORT_SYMBOL_GPL(vcap_add_rule);
+
+/* Allocate a new rule with the provided arguments */
+struct vcap_rule *vcap_alloc_rule(struct vcap_control *vctrl,
+				  struct net_device *ndev, int vcap_chain_id,
+				  enum vcap_user user, u16 priority,
+				  u32 id)
+{
+	struct vcap_rule_internal *ri;
+	struct vcap_admin *admin;
+
+	if (!ndev)
+		return ERR_PTR(-ENODEV);
+	/* Get the VCAP instance */
+	admin = vcap_find_admin(vctrl, vcap_chain_id);
+	if (!admin)
+		return ERR_PTR(-ENOENT);
+	/* Create a container for the rule and return it */
+	ri = kzalloc(sizeof(*ri), GFP_KERNEL);
+	if (!ri)
+		return ERR_PTR(-ENOMEM);
+	ri->data.vcap_chain_id = vcap_chain_id;
+	ri->data.user = user;
+	ri->data.priority = priority;
+	ri->data.id = id;
+	ri->data.keyset = VCAP_KFS_NO_VALUE;
+	ri->data.actionset = VCAP_AFS_NO_VALUE;
+	INIT_LIST_HEAD(&ri->list);
+	INIT_LIST_HEAD(&ri->data.keyfields);
+	INIT_LIST_HEAD(&ri->data.actionfields);
+	ri->ndev = ndev;
+	ri->admin = admin; /* refer to the vcap instance */
+	ri->vctrl = vctrl; /* refer to the client */
+	if (vcap_set_rule_id(ri) == 0)
+		goto out_free;
+	return (struct vcap_rule *)ri;
+
+out_free:
+	kfree(ri);
+	return ERR_PTR(-EINVAL);
+}
+EXPORT_SYMBOL_GPL(vcap_alloc_rule);
+
+/* Free mem of a rule owned by client after the rule as been added to the VCAP */
+void vcap_free_rule(struct vcap_rule *rule)
+{
+	struct vcap_rule_internal *ri = to_intrule(rule);
+	struct vcap_client_actionfield *caf, *next_caf;
+	struct vcap_client_keyfield *ckf, *next_ckf;
+
+	/* Deallocate the list of keys and actions */
+	list_for_each_entry_safe(ckf, next_ckf, &ri->data.keyfields, ctrl.list) {
+		list_del(&ckf->ctrl.list);
+		kfree(ckf);
+	}
+	list_for_each_entry_safe(caf, next_caf, &ri->data.actionfields, ctrl.list) {
+		list_del(&caf->ctrl.list);
+		kfree(caf);
+	}
+	/* Deallocate the rule */
+	kfree(rule);
+}
+EXPORT_SYMBOL_GPL(vcap_free_rule);
+
+/* Delete rule in a VCAP instance */
+int vcap_del_rule(struct vcap_control *vctrl, struct net_device *ndev, u32 id)
+{
+	struct vcap_rule_internal *ri, *elem;
+	struct vcap_admin *admin;
+
+	/* This will later also handle rule moving */
+	if (!ndev)
+		return -ENODEV;
+	/* Look for the rule id in all vcaps */
+	ri = vcap_lookup_rule(vctrl, id);
+	if (!ri)
+		return -EINVAL;
+	admin = ri->admin;
+	list_del(&ri->list);
+	if (list_empty(&admin->rules)) {
+		admin->last_used_addr = admin->last_valid_addr;
+	} else {
+		/* update the address range end marker from the last rule in the list */
+		elem = list_last_entry(&admin->rules, struct vcap_rule_internal, list);
+		admin->last_used_addr = elem->addr;
+	}
+	kfree(ri);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(vcap_del_rule);
+
+static void vcap_copy_from_client_keyfield(struct vcap_rule *rule,
+					   struct vcap_client_keyfield *field,
+					   struct vcap_client_keyfield_data *data)
+{
+	/* This will be expanded later to handle different vcap memory layouts */
+	memcpy(&field->data, data, sizeof(field->data));
+}
+
+static int vcap_rule_add_key(struct vcap_rule *rule,
+			     enum vcap_key_field key,
+			     enum vcap_field_type ftype,
+			     struct vcap_client_keyfield_data *data)
+{
+	struct vcap_client_keyfield *field;
+
+	/* More validation will be added here later */
+	field = kzalloc(sizeof(*field), GFP_KERNEL);
+	if (!field)
+		return -ENOMEM;
+	field->ctrl.key = key;
+	field->ctrl.type = ftype;
+	vcap_copy_from_client_keyfield(rule, field, data);
+	list_add_tail(&field->ctrl.list, &rule->keyfields);
+	return 0;
+}
+
+/* Add a 48 bit key with value and mask to the rule */
+int vcap_rule_add_key_u48(struct vcap_rule *rule, enum vcap_key_field key,
+			  struct vcap_u48_key *fieldval)
+{
+	struct vcap_client_keyfield_data data;
+
+	memcpy(&data.u48, fieldval, sizeof(data.u48));
+	return vcap_rule_add_key(rule, key, VCAP_FIELD_U48, &data);
+}
+EXPORT_SYMBOL_GPL(vcap_rule_add_key_u48);
+
+static void vcap_copy_from_client_actionfield(struct vcap_rule *rule,
+					      struct vcap_client_actionfield *field,
+					      struct vcap_client_actionfield_data *data)
+{
+	/* This will be expanded later to handle different vcap memory layouts */
+	memcpy(&field->data, data, sizeof(field->data));
+}
+
+static int vcap_rule_add_action(struct vcap_rule *rule,
+				enum vcap_action_field action,
+				enum vcap_field_type ftype,
+				struct vcap_client_actionfield_data *data)
+{
+	struct vcap_client_actionfield *field;
+
+	/* More validation will be added here later */
+	field = kzalloc(sizeof(*field), GFP_KERNEL);
+	if (!field)
+		return -ENOMEM;
+	field->ctrl.action = action;
+	field->ctrl.type = ftype;
+	vcap_copy_from_client_actionfield(rule, field, data);
+	list_add_tail(&field->ctrl.list, &rule->actionfields);
+	return 0;
+}
+
+static void vcap_rule_set_action_bitsize(struct vcap_u1_action *u1,
+					 enum vcap_bit val)
+{
+	switch (val) {
+	case VCAP_BIT_0:
+		u1->value = 0;
+		break;
+	case VCAP_BIT_1:
+		u1->value = 1;
+		break;
+	case VCAP_BIT_ANY:
+		u1->value = 0;
+		break;
+	}
+}
+
+/* Add a bit action with value to the rule */
+int vcap_rule_add_action_bit(struct vcap_rule *rule,
+			     enum vcap_action_field action,
+			     enum vcap_bit val)
+{
+	struct vcap_client_actionfield_data data;
+
+	vcap_rule_set_action_bitsize(&data.u1, val);
+	return vcap_rule_add_action(rule, action, VCAP_FIELD_BIT, &data);
+}
+EXPORT_SYMBOL_GPL(vcap_rule_add_action_bit);
+
+/* Add a 32 bit action field with value to the rule */
+int vcap_rule_add_action_u32(struct vcap_rule *rule,
+			     enum vcap_action_field action,
+			     u32 value)
+{
+	struct vcap_client_actionfield_data data;
+
+	data.u32.value = value;
+	return vcap_rule_add_action(rule, action, VCAP_FIELD_U32, &data);
+}
+EXPORT_SYMBOL_GPL(vcap_rule_add_action_u32);
+
+/* Copy to host byte order */
+void vcap_netbytes_copy(u8 *dst, u8 *src, int count)
+{
+	int idx;
+
+	for (idx = 0; idx < count; ++idx, ++dst)
+		*dst = src[count - idx - 1];
+}
+EXPORT_SYMBOL_GPL(vcap_netbytes_copy);
+
+/* Convert validation error code into tc extact error message */
+void vcap_set_tc_exterr(struct flow_cls_offload *fco, struct vcap_rule *vrule)
+{
+	switch (vrule->exterr) {
+	case VCAP_ERR_NONE:
+		break;
+	case VCAP_ERR_NO_ADMIN:
+		NL_SET_ERR_MSG_MOD(fco->common.extack,
+				   "Missing VCAP instance");
+		break;
+	case VCAP_ERR_NO_NETDEV:
+		NL_SET_ERR_MSG_MOD(fco->common.extack,
+				   "Missing network interface");
+		break;
+	case VCAP_ERR_NO_KEYSET_MATCH:
+		NL_SET_ERR_MSG_MOD(fco->common.extack,
+				   "No keyset matched the filter keys");
+		break;
+	case VCAP_ERR_NO_ACTIONSET_MATCH:
+		NL_SET_ERR_MSG_MOD(fco->common.extack,
+				   "No actionset matched the filter actions");
+		break;
+	case VCAP_ERR_NO_PORT_KEYSET_MATCH:
+		NL_SET_ERR_MSG_MOD(fco->common.extack,
+				   "No port keyset matched the filter keys");
+		break;
+	}
+}
+EXPORT_SYMBOL_GPL(vcap_set_tc_exterr);