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// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
// Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
#include <linux/if_vlan.h>
#include "act.h"
#include "pedit.h"
#include "en/tc_priv.h"
#include "en/mod_hdr.h"
static int pedit_header_offsets[] = {
[FLOW_ACT_MANGLE_HDR_TYPE_ETH] = offsetof(struct pedit_headers, eth),
[FLOW_ACT_MANGLE_HDR_TYPE_IP4] = offsetof(struct pedit_headers, ip4),
[FLOW_ACT_MANGLE_HDR_TYPE_IP6] = offsetof(struct pedit_headers, ip6),
[FLOW_ACT_MANGLE_HDR_TYPE_TCP] = offsetof(struct pedit_headers, tcp),
[FLOW_ACT_MANGLE_HDR_TYPE_UDP] = offsetof(struct pedit_headers, udp),
};
#define pedit_header(_ph, _htype) ((void *)(_ph) + pedit_header_offsets[_htype])
static int
set_pedit_val(u8 hdr_type, u32 mask, u32 val, u32 offset,
struct pedit_headers_action *hdrs,
struct netlink_ext_ack *extack)
{
u32 *curr_pmask, *curr_pval;
curr_pmask = (u32 *)(pedit_header(&hdrs->masks, hdr_type) + offset);
curr_pval = (u32 *)(pedit_header(&hdrs->vals, hdr_type) + offset);
if (*curr_pmask & mask) { /* disallow acting twice on the same location */
NL_SET_ERR_MSG_MOD(extack,
"curr_pmask and new mask same. Acting twice on same location");
goto out_err;
}
*curr_pmask |= mask;
*curr_pval |= (val & mask);
return 0;
out_err:
return -EOPNOTSUPP;
}
static int
parse_pedit_to_modify_hdr(struct mlx5e_priv *priv,
const struct flow_action_entry *act, int namespace,
struct mlx5e_tc_flow_parse_attr *parse_attr,
struct pedit_headers_action *hdrs,
struct netlink_ext_ack *extack)
{
u8 cmd = (act->id == FLOW_ACTION_MANGLE) ? 0 : 1;
u8 htype = act->mangle.htype;
int err = -EOPNOTSUPP;
u32 mask, val, offset;
if (htype == FLOW_ACT_MANGLE_UNSPEC) {
NL_SET_ERR_MSG_MOD(extack, "legacy pedit isn't offloaded");
goto out_err;
}
if (!mlx5e_mod_hdr_max_actions(priv->mdev, namespace)) {
NL_SET_ERR_MSG_MOD(extack, "The pedit offload action is not supported");
goto out_err;
}
mask = act->mangle.mask;
val = act->mangle.val;
offset = act->mangle.offset;
err = set_pedit_val(htype, ~mask, val, offset, &hdrs[cmd], extack);
if (err)
goto out_err;
hdrs[cmd].pedits++;
return 0;
out_err:
return err;
}
static int
parse_pedit_to_reformat(const struct flow_action_entry *act,
struct mlx5e_tc_flow_parse_attr *parse_attr,
struct netlink_ext_ack *extack)
{
u32 mask, val, offset;
u32 *p;
if (act->id != FLOW_ACTION_MANGLE) {
NL_SET_ERR_MSG_MOD(extack, "Unsupported action id");
return -EOPNOTSUPP;
}
if (act->mangle.htype != FLOW_ACT_MANGLE_HDR_TYPE_ETH) {
NL_SET_ERR_MSG_MOD(extack, "Only Ethernet modification is supported");
return -EOPNOTSUPP;
}
mask = ~act->mangle.mask;
val = act->mangle.val;
offset = act->mangle.offset;
p = (u32 *)&parse_attr->eth;
*(p + (offset >> 2)) |= (val & mask);
return 0;
}
int
mlx5e_tc_act_pedit_parse_action(struct mlx5e_priv *priv,
const struct flow_action_entry *act, int namespace,
struct mlx5e_tc_flow_parse_attr *parse_attr,
struct pedit_headers_action *hdrs,
struct mlx5e_tc_flow *flow,
struct netlink_ext_ack *extack)
{
if (flow && flow_flag_test(flow, L3_TO_L2_DECAP))
return parse_pedit_to_reformat(act, parse_attr, extack);
return parse_pedit_to_modify_hdr(priv, act, namespace, parse_attr, hdrs, extack);
}
static bool
tc_act_can_offload_pedit(struct mlx5e_tc_act_parse_state *parse_state,
const struct flow_action_entry *act,
int act_index)
{
return true;
}
static int
tc_act_parse_pedit(struct mlx5e_tc_act_parse_state *parse_state,
const struct flow_action_entry *act,
struct mlx5e_priv *priv,
struct mlx5_flow_attr *attr)
{
struct mlx5_esw_flow_attr *esw_attr = attr->esw_attr;
struct mlx5e_tc_flow *flow = parse_state->flow;
enum mlx5_flow_namespace_type ns_type;
int err;
ns_type = mlx5e_get_flow_namespace(flow);
err = mlx5e_tc_act_pedit_parse_action(flow->priv, act, ns_type,
attr->parse_attr, parse_state->hdrs,
flow, parse_state->extack);
if (err)
return err;
if (flow_flag_test(flow, L3_TO_L2_DECAP))
goto out;
attr->action |= MLX5_FLOW_CONTEXT_ACTION_MOD_HDR;
if (ns_type == MLX5_FLOW_NAMESPACE_FDB)
esw_attr->split_count = esw_attr->out_count;
out:
return 0;
}
struct mlx5e_tc_act mlx5e_tc_act_pedit = {
.can_offload = tc_act_can_offload_pedit,
.parse_action = tc_act_parse_pedit,
};
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