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/*
* Copyright (C) 2016-2017 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.
*/
/*
* nfp_net_offload.c
* Netronome network device driver: TC offload functions for PF and VF
*/
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/pci.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <net/pkt_cls.h>
#include <net/tc_act/tc_gact.h>
#include <net/tc_act/tc_mirred.h>
#include "main.h"
#include "../nfp_net_ctrl.h"
#include "../nfp_net.h"
static int
nfp_prog_prepare(struct nfp_prog *nfp_prog, const struct bpf_insn *prog,
unsigned int cnt)
{
struct nfp_insn_meta *meta;
unsigned int i;
for (i = 0; i < cnt; i++) {
meta = kzalloc(sizeof(*meta), GFP_KERNEL);
if (!meta)
return -ENOMEM;
meta->insn = prog[i];
meta->n = i;
list_add_tail(&meta->l, &nfp_prog->insns);
}
/* Another pass to record jump information. */
list_for_each_entry(meta, &nfp_prog->insns, l) {
u64 code = meta->insn.code;
if (BPF_CLASS(code) == BPF_JMP && BPF_OP(code) != BPF_EXIT &&
BPF_OP(code) != BPF_CALL) {
struct nfp_insn_meta *dst_meta;
unsigned short dst_indx;
dst_indx = meta->n + 1 + meta->insn.off;
dst_meta = nfp_bpf_goto_meta(nfp_prog, meta, dst_indx,
cnt);
meta->jmp_dst = dst_meta;
dst_meta->flags |= FLAG_INSN_IS_JUMP_DST;
}
}
return 0;
}
static void nfp_prog_free(struct nfp_prog *nfp_prog)
{
struct nfp_insn_meta *meta, *tmp;
list_for_each_entry_safe(meta, tmp, &nfp_prog->insns, l) {
list_del(&meta->l);
kfree(meta);
}
kfree(nfp_prog);
}
int nfp_bpf_verifier_prep(struct nfp_app *app, struct nfp_net *nn,
struct netdev_bpf *bpf)
{
struct bpf_prog *prog = bpf->verifier.prog;
struct nfp_prog *nfp_prog;
int ret;
nfp_prog = kzalloc(sizeof(*nfp_prog), GFP_KERNEL);
if (!nfp_prog)
return -ENOMEM;
prog->aux->offload->dev_priv = nfp_prog;
INIT_LIST_HEAD(&nfp_prog->insns);
nfp_prog->type = prog->type;
ret = nfp_prog_prepare(nfp_prog, prog->insnsi, prog->len);
if (ret)
goto err_free;
nfp_prog->verifier_meta = nfp_prog_first_meta(nfp_prog);
bpf->verifier.ops = &nfp_bpf_analyzer_ops;
return 0;
err_free:
nfp_prog_free(nfp_prog);
return ret;
}
int nfp_bpf_translate(struct nfp_app *app, struct nfp_net *nn,
struct bpf_prog *prog)
{
struct nfp_prog *nfp_prog = prog->aux->offload->dev_priv;
unsigned int stack_size;
unsigned int max_instr;
stack_size = nn_readb(nn, NFP_NET_CFG_BPF_STACK_SZ) * 64;
if (prog->aux->stack_depth > stack_size) {
nn_info(nn, "stack too large: program %dB > FW stack %dB\n",
prog->aux->stack_depth, stack_size);
return -EOPNOTSUPP;
}
nfp_prog->stack_depth = prog->aux->stack_depth;
nfp_prog->start_off = nn_readw(nn, NFP_NET_CFG_BPF_START);
nfp_prog->tgt_done = nn_readw(nn, NFP_NET_CFG_BPF_DONE);
max_instr = nn_readw(nn, NFP_NET_CFG_BPF_MAX_LEN);
nfp_prog->__prog_alloc_len = max_instr * sizeof(u64);
nfp_prog->prog = kmalloc(nfp_prog->__prog_alloc_len, GFP_KERNEL);
if (!nfp_prog->prog)
return -ENOMEM;
return nfp_bpf_jit(nfp_prog);
}
int nfp_bpf_destroy(struct nfp_app *app, struct nfp_net *nn,
struct bpf_prog *prog)
{
struct nfp_prog *nfp_prog = prog->aux->offload->dev_priv;
kfree(nfp_prog->prog);
nfp_prog_free(nfp_prog);
return 0;
}
static int nfp_net_bpf_load(struct nfp_net *nn, struct bpf_prog *prog)
{
struct nfp_prog *nfp_prog = prog->aux->offload->dev_priv;
unsigned int max_mtu;
dma_addr_t dma_addr;
int err;
max_mtu = nn_readb(nn, NFP_NET_CFG_BPF_INL_MTU) * 64 - 32;
if (max_mtu < nn->dp.netdev->mtu) {
nn_info(nn, "BPF offload not supported with MTU larger than HW packet split boundary\n");
return -EOPNOTSUPP;
}
dma_addr = dma_map_single(nn->dp.dev, nfp_prog->prog,
nfp_prog->prog_len * sizeof(u64),
DMA_TO_DEVICE);
if (dma_mapping_error(nn->dp.dev, dma_addr))
return -ENOMEM;
nn_writew(nn, NFP_NET_CFG_BPF_SIZE, nfp_prog->prog_len);
nn_writeq(nn, NFP_NET_CFG_BPF_ADDR, dma_addr);
/* Load up the JITed code */
err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_BPF);
if (err)
nn_err(nn, "FW command error while loading BPF: %d\n", err);
dma_unmap_single(nn->dp.dev, dma_addr, nfp_prog->prog_len * sizeof(u64),
DMA_TO_DEVICE);
return err;
}
static void nfp_net_bpf_start(struct nfp_net *nn)
{
int err;
/* Enable passing packets through BPF function */
nn->dp.ctrl |= NFP_NET_CFG_CTRL_BPF;
nn_writel(nn, NFP_NET_CFG_CTRL, nn->dp.ctrl);
err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_GEN);
if (err)
nn_err(nn, "FW command error while enabling BPF: %d\n", err);
}
static int nfp_net_bpf_stop(struct nfp_net *nn)
{
if (!(nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF))
return 0;
nn->dp.ctrl &= ~NFP_NET_CFG_CTRL_BPF;
nn_writel(nn, NFP_NET_CFG_CTRL, nn->dp.ctrl);
return nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_GEN);
}
int nfp_net_bpf_offload(struct nfp_net *nn, struct bpf_prog *prog,
bool old_prog)
{
int err;
if (prog) {
struct bpf_dev_offload *offload = prog->aux->offload;
if (!offload)
return -EINVAL;
if (offload->netdev != nn->dp.netdev)
return -EINVAL;
}
if (prog && old_prog) {
u8 cap;
cap = nn_readb(nn, NFP_NET_CFG_BPF_CAP);
if (!(cap & NFP_NET_BPF_CAP_RELO)) {
nn_err(nn, "FW does not support live reload\n");
return -EBUSY;
}
}
/* Something else is loaded, different program type? */
if (!old_prog && nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF)
return -EBUSY;
if (old_prog && !prog)
return nfp_net_bpf_stop(nn);
err = nfp_net_bpf_load(nn, prog);
if (err)
return err;
if (!old_prog)
nfp_net_bpf_start(nn);
return 0;
}
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