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/*
* 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 <net/pkt_cls.h>
#include "../nfpcore/nfp_cpp.h"
#include "../nfp_app.h"
#include "../nfp_main.h"
#include "../nfp_net.h"
#include "../nfp_port.h"
#include "main.h"
static bool nfp_net_ebpf_capable(struct nfp_net *nn)
{
#ifdef __LITTLE_ENDIAN
if (nn->cap & NFP_NET_CFG_CTRL_BPF &&
nn_readb(nn, NFP_NET_CFG_BPF_ABI) == NFP_NET_BPF_ABI)
return true;
#endif
return false;
}
static int
nfp_bpf_xdp_offload(struct nfp_app *app, struct nfp_net *nn,
struct bpf_prog *prog)
{
bool running, xdp_running;
int ret;
if (!nfp_net_ebpf_capable(nn))
return -EINVAL;
running = nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF;
xdp_running = running && nn->dp.bpf_offload_xdp;
if (!prog && !xdp_running)
return 0;
if (prog && running && !xdp_running)
return -EBUSY;
ret = nfp_net_bpf_offload(nn, prog, running);
/* Stop offload if replace not possible */
if (ret && prog)
nfp_bpf_xdp_offload(app, nn, NULL);
nn->dp.bpf_offload_xdp = prog && !ret;
return ret;
}
static const char *nfp_bpf_extra_cap(struct nfp_app *app, struct nfp_net *nn)
{
return nfp_net_ebpf_capable(nn) ? "BPF" : "";
}
static int
nfp_bpf_vnic_alloc(struct nfp_app *app, struct nfp_net *nn, unsigned int id)
{
int err;
nn->app_priv = kzalloc(sizeof(struct nfp_bpf_vnic), GFP_KERNEL);
if (!nn->app_priv)
return -ENOMEM;
err = nfp_app_nic_vnic_alloc(app, nn, id);
if (err)
goto err_free_priv;
return 0;
err_free_priv:
kfree(nn->app_priv);
return err;
}
static void nfp_bpf_vnic_free(struct nfp_app *app, struct nfp_net *nn)
{
struct nfp_bpf_vnic *bv = nn->app_priv;
if (nn->dp.bpf_offload_xdp)
nfp_bpf_xdp_offload(app, nn, NULL);
WARN_ON(bv->tc_prog);
kfree(bv);
}
static int nfp_bpf_setup_tc_block_cb(enum tc_setup_type type,
void *type_data, void *cb_priv)
{
struct tc_cls_bpf_offload *cls_bpf = type_data;
struct nfp_net *nn = cb_priv;
struct bpf_prog *oldprog;
struct nfp_bpf_vnic *bv;
int err;
if (type != TC_SETUP_CLSBPF ||
!tc_can_offload(nn->dp.netdev) ||
!nfp_net_ebpf_capable(nn) ||
cls_bpf->common.protocol != htons(ETH_P_ALL) ||
cls_bpf->common.chain_index)
return -EOPNOTSUPP;
/* Only support TC direct action */
if (!cls_bpf->exts_integrated ||
tcf_exts_has_actions(cls_bpf->exts)) {
nn_err(nn, "only direct action with no legacy actions supported\n");
return -EOPNOTSUPP;
}
if (cls_bpf->command != TC_CLSBPF_OFFLOAD)
return -EOPNOTSUPP;
bv = nn->app_priv;
oldprog = cls_bpf->oldprog;
/* Don't remove if oldprog doesn't match driver's state */
if (bv->tc_prog != oldprog) {
oldprog = NULL;
if (!cls_bpf->prog)
return 0;
}
err = nfp_net_bpf_offload(nn, cls_bpf->prog, oldprog);
if (err)
return err;
bv->tc_prog = cls_bpf->prog;
return 0;
}
static int nfp_bpf_setup_tc_block(struct net_device *netdev,
struct tc_block_offload *f)
{
struct nfp_net *nn = netdev_priv(netdev);
if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
return -EOPNOTSUPP;
switch (f->command) {
case TC_BLOCK_BIND:
return tcf_block_cb_register(f->block,
nfp_bpf_setup_tc_block_cb,
nn, nn);
case TC_BLOCK_UNBIND:
tcf_block_cb_unregister(f->block,
nfp_bpf_setup_tc_block_cb,
nn);
return 0;
default:
return -EOPNOTSUPP;
}
}
static int nfp_bpf_setup_tc(struct nfp_app *app, struct net_device *netdev,
enum tc_setup_type type, void *type_data)
{
switch (type) {
case TC_SETUP_BLOCK:
return nfp_bpf_setup_tc_block(netdev, type_data);
default:
return -EOPNOTSUPP;
}
}
static bool nfp_bpf_tc_busy(struct nfp_app *app, struct nfp_net *nn)
{
return nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF;
}
const struct nfp_app_type app_bpf = {
.id = NFP_APP_BPF_NIC,
.name = "ebpf",
.extra_cap = nfp_bpf_extra_cap,
.vnic_alloc = nfp_bpf_vnic_alloc,
.vnic_free = nfp_bpf_vnic_free,
.setup_tc = nfp_bpf_setup_tc,
.tc_busy = nfp_bpf_tc_busy,
.xdp_offload = nfp_bpf_xdp_offload,
.bpf_verifier_prep = nfp_bpf_verifier_prep,
.bpf_translate = nfp_bpf_translate,
.bpf_destroy = nfp_bpf_destroy,
};
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