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// SPDX-License-Identifier: GPL-2.0-only
/****************************************************************************
* Driver for Solarflare network controllers and boards
* Copyright 2023, Advanced Micro Devices, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, incorporated herein by reference.
*/
#include "tc_conntrack.h"
#include "tc.h"
#include "mae.h"
static int efx_tc_flow_block(enum tc_setup_type type, void *type_data,
void *cb_priv);
static const struct rhashtable_params efx_tc_ct_zone_ht_params = {
.key_len = offsetof(struct efx_tc_ct_zone, linkage),
.key_offset = 0,
.head_offset = offsetof(struct efx_tc_ct_zone, linkage),
};
static void efx_tc_ct_zone_free(void *ptr, void *arg)
{
struct efx_tc_ct_zone *zone = ptr;
struct efx_nic *efx = zone->efx;
netif_err(efx, drv, efx->net_dev,
"tc ct_zone %u still present at teardown, removing\n",
zone->zone);
nf_flow_table_offload_del_cb(zone->nf_ft, efx_tc_flow_block, zone);
kfree(zone);
}
int efx_tc_init_conntrack(struct efx_nic *efx)
{
int rc;
rc = rhashtable_init(&efx->tc->ct_zone_ht, &efx_tc_ct_zone_ht_params);
if (rc < 0)
return rc;
return 0;
}
void efx_tc_fini_conntrack(struct efx_nic *efx)
{
rhashtable_free_and_destroy(&efx->tc->ct_zone_ht, efx_tc_ct_zone_free, NULL);
}
static int efx_tc_flow_block(enum tc_setup_type type, void *type_data,
void *cb_priv)
{
return -EOPNOTSUPP;
}
struct efx_tc_ct_zone *efx_tc_ct_register_zone(struct efx_nic *efx, u16 zone,
struct nf_flowtable *ct_ft)
{
struct efx_tc_ct_zone *ct_zone, *old;
int rc;
ct_zone = kzalloc(sizeof(*ct_zone), GFP_USER);
if (!ct_zone)
return ERR_PTR(-ENOMEM);
ct_zone->zone = zone;
old = rhashtable_lookup_get_insert_fast(&efx->tc->ct_zone_ht,
&ct_zone->linkage,
efx_tc_ct_zone_ht_params);
if (old) {
/* don't need our new entry */
kfree(ct_zone);
if (!refcount_inc_not_zero(&old->ref))
return ERR_PTR(-EAGAIN);
/* existing entry found */
WARN_ON_ONCE(old->nf_ft != ct_ft);
netif_dbg(efx, drv, efx->net_dev,
"Found existing ct_zone for %u\n", zone);
return old;
}
ct_zone->nf_ft = ct_ft;
ct_zone->efx = efx;
rc = nf_flow_table_offload_add_cb(ct_ft, efx_tc_flow_block, ct_zone);
netif_dbg(efx, drv, efx->net_dev, "Adding new ct_zone for %u, rc %d\n",
zone, rc);
if (rc < 0)
goto fail;
refcount_set(&ct_zone->ref, 1);
return ct_zone;
fail:
rhashtable_remove_fast(&efx->tc->ct_zone_ht, &ct_zone->linkage,
efx_tc_ct_zone_ht_params);
kfree(ct_zone);
return ERR_PTR(rc);
}
void efx_tc_ct_unregister_zone(struct efx_nic *efx,
struct efx_tc_ct_zone *ct_zone)
{
if (!refcount_dec_and_test(&ct_zone->ref))
return; /* still in use */
nf_flow_table_offload_del_cb(ct_zone->nf_ft, efx_tc_flow_block, ct_zone);
rhashtable_remove_fast(&efx->tc->ct_zone_ht, &ct_zone->linkage,
efx_tc_ct_zone_ht_params);
netif_dbg(efx, drv, efx->net_dev, "Removed ct_zone for %u\n",
ct_zone->zone);
kfree(ct_zone);
}
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