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// SPDX-License-Identifier: GPL-2.0+
/* Microchip VCAP API
*
* Copyright (c) 2022 Microchip Technology Inc. and its subsidiaries.
*/
#include <net/tcp.h>
#include "sparx5_tc.h"
#include "vcap_api.h"
#include "vcap_api_client.h"
#include "sparx5_main.h"
#include "sparx5_vcap_impl.h"
struct sparx5_tc_flower_parse_usage {
struct flow_cls_offload *fco;
struct flow_rule *frule;
struct vcap_rule *vrule;
unsigned int used_keys;
};
static int sparx5_tc_flower_handler_ethaddr_usage(struct sparx5_tc_flower_parse_usage *st)
{
enum vcap_key_field smac_key = VCAP_KF_L2_SMAC;
enum vcap_key_field dmac_key = VCAP_KF_L2_DMAC;
struct flow_match_eth_addrs match;
struct vcap_u48_key smac, dmac;
int err = 0;
flow_rule_match_eth_addrs(st->frule, &match);
if (!is_zero_ether_addr(match.mask->src)) {
vcap_netbytes_copy(smac.value, match.key->src, ETH_ALEN);
vcap_netbytes_copy(smac.mask, match.mask->src, ETH_ALEN);
err = vcap_rule_add_key_u48(st->vrule, smac_key, &smac);
if (err)
goto out;
}
if (!is_zero_ether_addr(match.mask->dst)) {
vcap_netbytes_copy(dmac.value, match.key->dst, ETH_ALEN);
vcap_netbytes_copy(dmac.mask, match.mask->dst, ETH_ALEN);
err = vcap_rule_add_key_u48(st->vrule, dmac_key, &dmac);
if (err)
goto out;
}
st->used_keys |= BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS);
return err;
out:
NL_SET_ERR_MSG_MOD(st->fco->common.extack, "eth_addr parse error");
return err;
}
static int (*sparx5_tc_flower_usage_handlers[])(struct sparx5_tc_flower_parse_usage *st) = {
/* More dissector handlers will be added here later */
[FLOW_DISSECTOR_KEY_ETH_ADDRS] = sparx5_tc_flower_handler_ethaddr_usage,
};
static int sparx5_tc_use_dissectors(struct flow_cls_offload *fco,
struct vcap_admin *admin,
struct vcap_rule *vrule)
{
struct sparx5_tc_flower_parse_usage state = {
.fco = fco,
.vrule = vrule,
};
int idx, err = 0;
state.frule = flow_cls_offload_flow_rule(fco);
for (idx = 0; idx < ARRAY_SIZE(sparx5_tc_flower_usage_handlers); ++idx) {
if (!flow_rule_match_key(state.frule, idx))
continue;
if (!sparx5_tc_flower_usage_handlers[idx])
continue;
err = sparx5_tc_flower_usage_handlers[idx](&state);
if (err)
return err;
}
return err;
}
static int sparx5_tc_flower_replace(struct net_device *ndev,
struct flow_cls_offload *fco,
struct vcap_admin *admin)
{
struct sparx5_port *port = netdev_priv(ndev);
struct flow_action_entry *act;
struct vcap_control *vctrl;
struct flow_rule *frule;
struct vcap_rule *vrule;
int err, idx;
frule = flow_cls_offload_flow_rule(fco);
if (!flow_action_has_entries(&frule->action)) {
NL_SET_ERR_MSG_MOD(fco->common.extack, "No actions");
return -EINVAL;
}
if (!flow_action_basic_hw_stats_check(&frule->action, fco->common.extack))
return -EOPNOTSUPP;
vctrl = port->sparx5->vcap_ctrl;
vrule = vcap_alloc_rule(vctrl, ndev, fco->common.chain_index, VCAP_USER_TC,
fco->common.prio, 0);
if (IS_ERR(vrule))
return PTR_ERR(vrule);
vrule->cookie = fco->cookie;
sparx5_tc_use_dissectors(fco, admin, vrule);
flow_action_for_each(idx, act, &frule->action) {
switch (act->id) {
case FLOW_ACTION_TRAP:
err = vcap_rule_add_action_bit(vrule,
VCAP_AF_CPU_COPY_ENA,
VCAP_BIT_1);
if (err)
goto out;
err = vcap_rule_add_action_u32(vrule,
VCAP_AF_CPU_QUEUE_NUM, 0);
if (err)
goto out;
err = vcap_rule_add_action_u32(vrule, VCAP_AF_MASK_MODE,
SPX5_PMM_REPLACE_ALL);
if (err)
goto out;
/* For now the actionset is hardcoded */
err = vcap_set_rule_set_actionset(vrule,
VCAP_AFS_BASE_TYPE);
if (err)
goto out;
break;
case FLOW_ACTION_ACCEPT:
/* For now the actionset is hardcoded */
err = vcap_set_rule_set_actionset(vrule,
VCAP_AFS_BASE_TYPE);
if (err)
goto out;
break;
default:
NL_SET_ERR_MSG_MOD(fco->common.extack,
"Unsupported TC action");
err = -EOPNOTSUPP;
goto out;
}
}
/* For now the keyset is hardcoded */
err = vcap_set_rule_set_keyset(vrule, VCAP_KFS_MAC_ETYPE);
if (err) {
NL_SET_ERR_MSG_MOD(fco->common.extack,
"No matching port keyset for filter protocol and keys");
goto out;
}
err = vcap_val_rule(vrule, ETH_P_ALL);
if (err) {
vcap_set_tc_exterr(fco, vrule);
goto out;
}
err = vcap_add_rule(vrule);
if (err)
NL_SET_ERR_MSG_MOD(fco->common.extack,
"Could not add the filter");
out:
vcap_free_rule(vrule);
return err;
}
static int sparx5_tc_flower_destroy(struct net_device *ndev,
struct flow_cls_offload *fco,
struct vcap_admin *admin)
{
struct sparx5_port *port = netdev_priv(ndev);
struct vcap_control *vctrl;
int err = -ENOENT, rule_id;
vctrl = port->sparx5->vcap_ctrl;
while (true) {
rule_id = vcap_lookup_rule_by_cookie(vctrl, fco->cookie);
if (rule_id <= 0)
break;
err = vcap_del_rule(vctrl, ndev, rule_id);
if (err) {
pr_err("%s:%d: could not delete rule %d\n",
__func__, __LINE__, rule_id);
break;
}
}
return err;
}
int sparx5_tc_flower(struct net_device *ndev, struct flow_cls_offload *fco,
bool ingress)
{
struct sparx5_port *port = netdev_priv(ndev);
struct vcap_control *vctrl;
struct vcap_admin *admin;
int err = -EINVAL;
/* Get vcap instance from the chain id */
vctrl = port->sparx5->vcap_ctrl;
admin = vcap_find_admin(vctrl, fco->common.chain_index);
if (!admin) {
NL_SET_ERR_MSG_MOD(fco->common.extack, "Invalid chain");
return err;
}
switch (fco->command) {
case FLOW_CLS_REPLACE:
return sparx5_tc_flower_replace(ndev, fco, admin);
case FLOW_CLS_DESTROY:
return sparx5_tc_flower_destroy(ndev, fco, admin);
default:
return -EOPNOTSUPP;
}
}
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