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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)
{
if (nn->cap & NFP_NET_CFG_CTRL_BPF &&
nn_readb(nn, NFP_NET_CFG_BPF_ABI) == NFP_NET_BPF_ABI)
return true;
return false;
}
static int
nfp_bpf_xdp_offload(struct nfp_app *app, struct nfp_net *nn,
struct bpf_prog *prog)
{
struct tc_cls_bpf_offload cmd = {
.prog = prog,
};
int ret;
if (!nfp_net_ebpf_capable(nn))
return -EINVAL;
if (nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF) {
if (!nn->dp.bpf_offload_xdp)
return prog ? -EBUSY : 0;
cmd.command = prog ? TC_CLSBPF_REPLACE : TC_CLSBPF_DESTROY;
} else {
if (!prog)
return 0;
cmd.command = TC_CLSBPF_ADD;
}
ret = nfp_net_bpf_offload(nn, &cmd);
/* Stop offload if replace not possible */
if (ret && cmd.command == TC_CLSBPF_REPLACE)
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_init(struct nfp_app *app, struct nfp_net *nn, unsigned int id)
{
struct nfp_net_bpf_priv *priv;
int ret;
/* Limit to single port, otherwise it's just a NIC */
if (id > 0) {
nfp_warn(app->cpp,
"BPF NIC doesn't support more than one port right now\n");
nn->port = nfp_port_alloc(app, NFP_PORT_INVALID, nn->dp.netdev);
return PTR_ERR_OR_ZERO(nn->port);
}
priv = kmalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
nn->app_priv = priv;
spin_lock_init(&priv->rx_filter_lock);
setup_timer(&priv->rx_filter_stats_timer,
nfp_net_filter_stats_timer, (unsigned long)nn);
ret = nfp_app_nic_vnic_init(app, nn, id);
if (ret)
kfree(priv);
return ret;
}
static void nfp_bpf_vnic_clean(struct nfp_app *app, struct nfp_net *nn)
{
if (nn->dp.bpf_offload_xdp)
nfp_bpf_xdp_offload(app, nn, NULL);
kfree(nn->app_priv);
}
static int nfp_bpf_setup_tc(struct nfp_app *app, struct net_device *netdev,
u32 handle, __be16 proto, struct tc_to_netdev *tc)
{
struct nfp_net *nn = netdev_priv(netdev);
if (TC_H_MAJ(handle) != TC_H_MAJ(TC_H_INGRESS))
return -EOPNOTSUPP;
if (proto != htons(ETH_P_ALL))
return -EOPNOTSUPP;
if (tc->type == TC_SETUP_CLSBPF && nfp_net_ebpf_capable(nn)) {
if (!nn->dp.bpf_offload_xdp)
return nfp_net_bpf_offload(nn, tc->cls_bpf);
else
return -EBUSY;
}
return -EINVAL;
}
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_init = nfp_bpf_vnic_init,
.vnic_clean = nfp_bpf_vnic_clean,
.setup_tc = nfp_bpf_setup_tc,
.tc_busy = nfp_bpf_tc_busy,
.xdp_offload = nfp_bpf_xdp_offload,
};
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