548 lines
13 KiB
C
548 lines
13 KiB
C
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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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/* Copyright (C) 2017-2018 Netronome Systems, Inc. */
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#include <net/pkt_cls.h>
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#include "../nfpcore/nfp_cpp.h"
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#include "../nfpcore/nfp_nffw.h"
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#include "../nfpcore/nfp_nsp.h"
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#include "../nfp_app.h"
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#include "../nfp_main.h"
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#include "../nfp_net.h"
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#include "../nfp_port.h"
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#include "fw.h"
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#include "main.h"
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const struct rhashtable_params nfp_bpf_maps_neutral_params = {
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.nelem_hint = 4,
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.key_len = sizeof_field(struct bpf_map, id),
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.key_offset = offsetof(struct nfp_bpf_neutral_map, map_id),
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.head_offset = offsetof(struct nfp_bpf_neutral_map, l),
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.automatic_shrinking = true,
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};
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static bool nfp_net_ebpf_capable(struct nfp_net *nn)
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{
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#ifdef __LITTLE_ENDIAN
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struct nfp_app_bpf *bpf = nn->app->priv;
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return nn->cap & NFP_NET_CFG_CTRL_BPF &&
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bpf->abi_version &&
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nn_readb(nn, NFP_NET_CFG_BPF_ABI) == bpf->abi_version;
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#else
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return false;
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#endif
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}
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static int
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nfp_bpf_xdp_offload(struct nfp_app *app, struct nfp_net *nn,
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struct bpf_prog *prog, struct netlink_ext_ack *extack)
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{
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bool running, xdp_running;
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if (!nfp_net_ebpf_capable(nn))
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return -EINVAL;
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running = nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF;
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xdp_running = running && nn->xdp_hw.prog;
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if (!prog && !xdp_running)
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return 0;
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if (prog && running && !xdp_running)
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return -EBUSY;
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return nfp_net_bpf_offload(nn, prog, running, extack);
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}
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static const char *nfp_bpf_extra_cap(struct nfp_app *app, struct nfp_net *nn)
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{
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return nfp_net_ebpf_capable(nn) ? "BPF" : "";
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}
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static int
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nfp_bpf_vnic_alloc(struct nfp_app *app, struct nfp_net *nn, unsigned int id)
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{
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struct nfp_pf *pf = app->pf;
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struct nfp_bpf_vnic *bv;
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int err;
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if (!pf->eth_tbl) {
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nfp_err(pf->cpp, "No ETH table\n");
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return -EINVAL;
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}
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if (pf->max_data_vnics != pf->eth_tbl->count) {
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nfp_err(pf->cpp, "ETH entries don't match vNICs (%d vs %d)\n",
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pf->max_data_vnics, pf->eth_tbl->count);
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return -EINVAL;
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}
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bv = kzalloc(sizeof(*bv), GFP_KERNEL);
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if (!bv)
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return -ENOMEM;
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nn->app_priv = bv;
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err = nfp_app_nic_vnic_alloc(app, nn, id);
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if (err)
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goto err_free_priv;
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bv->start_off = nn_readw(nn, NFP_NET_CFG_BPF_START);
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bv->tgt_done = nn_readw(nn, NFP_NET_CFG_BPF_DONE);
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return 0;
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err_free_priv:
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kfree(nn->app_priv);
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return err;
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}
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static void nfp_bpf_vnic_free(struct nfp_app *app, struct nfp_net *nn)
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{
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struct nfp_bpf_vnic *bv = nn->app_priv;
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WARN_ON(bv->tc_prog);
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kfree(bv);
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}
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static int nfp_bpf_setup_tc_block_cb(enum tc_setup_type type,
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void *type_data, void *cb_priv)
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{
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struct tc_cls_bpf_offload *cls_bpf = type_data;
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struct nfp_net *nn = cb_priv;
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struct bpf_prog *oldprog;
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struct nfp_bpf_vnic *bv;
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int err;
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if (type != TC_SETUP_CLSBPF) {
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NL_SET_ERR_MSG_MOD(cls_bpf->common.extack,
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"only offload of BPF classifiers supported");
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return -EOPNOTSUPP;
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}
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if (!tc_cls_can_offload_and_chain0(nn->dp.netdev, &cls_bpf->common))
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return -EOPNOTSUPP;
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if (!nfp_net_ebpf_capable(nn)) {
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NL_SET_ERR_MSG_MOD(cls_bpf->common.extack,
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"NFP firmware does not support eBPF offload");
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return -EOPNOTSUPP;
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}
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if (cls_bpf->common.protocol != htons(ETH_P_ALL)) {
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NL_SET_ERR_MSG_MOD(cls_bpf->common.extack,
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"only ETH_P_ALL supported as filter protocol");
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return -EOPNOTSUPP;
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}
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/* Only support TC direct action */
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if (!cls_bpf->exts_integrated ||
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tcf_exts_has_actions(cls_bpf->exts)) {
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NL_SET_ERR_MSG_MOD(cls_bpf->common.extack,
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"only direct action with no legacy actions supported");
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return -EOPNOTSUPP;
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}
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if (cls_bpf->command != TC_CLSBPF_OFFLOAD)
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return -EOPNOTSUPP;
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bv = nn->app_priv;
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oldprog = cls_bpf->oldprog;
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/* Don't remove if oldprog doesn't match driver's state */
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if (bv->tc_prog != oldprog) {
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oldprog = NULL;
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if (!cls_bpf->prog)
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return 0;
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}
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err = nfp_net_bpf_offload(nn, cls_bpf->prog, oldprog,
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cls_bpf->common.extack);
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if (err)
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return err;
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bv->tc_prog = cls_bpf->prog;
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nn->port->tc_offload_cnt = !!bv->tc_prog;
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return 0;
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}
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static LIST_HEAD(nfp_bpf_block_cb_list);
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static int nfp_bpf_setup_tc(struct nfp_app *app, struct net_device *netdev,
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enum tc_setup_type type, void *type_data)
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{
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struct nfp_net *nn = netdev_priv(netdev);
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switch (type) {
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case TC_SETUP_BLOCK:
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return flow_block_cb_setup_simple(type_data,
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&nfp_bpf_block_cb_list,
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nfp_bpf_setup_tc_block_cb,
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nn, nn, true);
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default:
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return -EOPNOTSUPP;
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}
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}
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static int
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nfp_bpf_check_mtu(struct nfp_app *app, struct net_device *netdev, int new_mtu)
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{
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struct nfp_net *nn = netdev_priv(netdev);
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struct nfp_bpf_vnic *bv;
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struct bpf_prog *prog;
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if (~nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF)
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return 0;
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if (nn->xdp_hw.prog) {
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prog = nn->xdp_hw.prog;
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} else {
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bv = nn->app_priv;
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prog = bv->tc_prog;
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}
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if (nfp_bpf_offload_check_mtu(nn, prog, new_mtu)) {
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nn_info(nn, "BPF offload active, potential packet access beyond hardware packet boundary");
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return -EBUSY;
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}
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return 0;
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}
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static int
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nfp_bpf_parse_cap_adjust_head(struct nfp_app_bpf *bpf, void __iomem *value,
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u32 length)
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{
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struct nfp_bpf_cap_tlv_adjust_head __iomem *cap = value;
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struct nfp_cpp *cpp = bpf->app->pf->cpp;
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if (length < sizeof(*cap)) {
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nfp_err(cpp, "truncated adjust_head TLV: %d\n", length);
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return -EINVAL;
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}
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bpf->adjust_head.flags = readl(&cap->flags);
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bpf->adjust_head.off_min = readl(&cap->off_min);
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bpf->adjust_head.off_max = readl(&cap->off_max);
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bpf->adjust_head.guaranteed_sub = readl(&cap->guaranteed_sub);
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bpf->adjust_head.guaranteed_add = readl(&cap->guaranteed_add);
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if (bpf->adjust_head.off_min > bpf->adjust_head.off_max) {
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nfp_err(cpp, "invalid adjust_head TLV: min > max\n");
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return -EINVAL;
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}
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if (!FIELD_FIT(UR_REG_IMM_MAX, bpf->adjust_head.off_min) ||
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!FIELD_FIT(UR_REG_IMM_MAX, bpf->adjust_head.off_max)) {
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nfp_warn(cpp, "disabling adjust_head - driver expects min/max to fit in as immediates\n");
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memset(&bpf->adjust_head, 0, sizeof(bpf->adjust_head));
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return 0;
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}
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return 0;
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}
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static int
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nfp_bpf_parse_cap_func(struct nfp_app_bpf *bpf, void __iomem *value, u32 length)
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{
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struct nfp_bpf_cap_tlv_func __iomem *cap = value;
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if (length < sizeof(*cap)) {
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nfp_err(bpf->app->cpp, "truncated function TLV: %d\n", length);
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return -EINVAL;
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}
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switch (readl(&cap->func_id)) {
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case BPF_FUNC_map_lookup_elem:
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bpf->helpers.map_lookup = readl(&cap->func_addr);
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break;
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case BPF_FUNC_map_update_elem:
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bpf->helpers.map_update = readl(&cap->func_addr);
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break;
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case BPF_FUNC_map_delete_elem:
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bpf->helpers.map_delete = readl(&cap->func_addr);
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break;
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case BPF_FUNC_perf_event_output:
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bpf->helpers.perf_event_output = readl(&cap->func_addr);
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break;
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}
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return 0;
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}
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static int
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nfp_bpf_parse_cap_maps(struct nfp_app_bpf *bpf, void __iomem *value, u32 length)
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{
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struct nfp_bpf_cap_tlv_maps __iomem *cap = value;
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if (length < sizeof(*cap)) {
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nfp_err(bpf->app->cpp, "truncated maps TLV: %d\n", length);
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return -EINVAL;
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}
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bpf->maps.types = readl(&cap->types);
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bpf->maps.max_maps = readl(&cap->max_maps);
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bpf->maps.max_elems = readl(&cap->max_elems);
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bpf->maps.max_key_sz = readl(&cap->max_key_sz);
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bpf->maps.max_val_sz = readl(&cap->max_val_sz);
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bpf->maps.max_elem_sz = readl(&cap->max_elem_sz);
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return 0;
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}
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static int
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nfp_bpf_parse_cap_random(struct nfp_app_bpf *bpf, void __iomem *value,
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u32 length)
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{
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bpf->pseudo_random = true;
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return 0;
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}
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static int
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nfp_bpf_parse_cap_qsel(struct nfp_app_bpf *bpf, void __iomem *value, u32 length)
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{
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bpf->queue_select = true;
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return 0;
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}
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static int
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nfp_bpf_parse_cap_adjust_tail(struct nfp_app_bpf *bpf, void __iomem *value,
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u32 length)
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{
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bpf->adjust_tail = true;
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return 0;
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}
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static int
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nfp_bpf_parse_cap_cmsg_multi_ent(struct nfp_app_bpf *bpf, void __iomem *value,
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u32 length)
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{
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bpf->cmsg_multi_ent = true;
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return 0;
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}
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static int
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nfp_bpf_parse_cap_abi_version(struct nfp_app_bpf *bpf, void __iomem *value,
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u32 length)
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{
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if (length < 4) {
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nfp_err(bpf->app->cpp, "truncated ABI version TLV: %d\n",
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length);
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return -EINVAL;
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}
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bpf->abi_version = readl(value);
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if (bpf->abi_version < 2 || bpf->abi_version > 3) {
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nfp_warn(bpf->app->cpp, "unsupported BPF ABI version: %d\n",
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bpf->abi_version);
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bpf->abi_version = 0;
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}
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return 0;
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}
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static int nfp_bpf_parse_capabilities(struct nfp_app *app)
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{
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struct nfp_cpp *cpp = app->pf->cpp;
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struct nfp_cpp_area *area;
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u8 __iomem *mem, *start;
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mem = nfp_rtsym_map(app->pf->rtbl, "_abi_bpf_capabilities", "bpf.cap",
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8, &area);
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if (IS_ERR(mem))
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return PTR_ERR(mem) == -ENOENT ? 0 : PTR_ERR(mem);
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start = mem;
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while (mem - start + 8 <= nfp_cpp_area_size(area)) {
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u8 __iomem *value;
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u32 type, length;
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type = readl(mem);
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length = readl(mem + 4);
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value = mem + 8;
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mem += 8 + length;
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if (mem - start > nfp_cpp_area_size(area))
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goto err_release_free;
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||
|
|
|
||
|
|
switch (type) {
|
||
|
|
case NFP_BPF_CAP_TYPE_FUNC:
|
||
|
|
if (nfp_bpf_parse_cap_func(app->priv, value, length))
|
||
|
|
goto err_release_free;
|
||
|
|
break;
|
||
|
|
case NFP_BPF_CAP_TYPE_ADJUST_HEAD:
|
||
|
|
if (nfp_bpf_parse_cap_adjust_head(app->priv, value,
|
||
|
|
length))
|
||
|
|
goto err_release_free;
|
||
|
|
break;
|
||
|
|
case NFP_BPF_CAP_TYPE_MAPS:
|
||
|
|
if (nfp_bpf_parse_cap_maps(app->priv, value, length))
|
||
|
|
goto err_release_free;
|
||
|
|
break;
|
||
|
|
case NFP_BPF_CAP_TYPE_RANDOM:
|
||
|
|
if (nfp_bpf_parse_cap_random(app->priv, value, length))
|
||
|
|
goto err_release_free;
|
||
|
|
break;
|
||
|
|
case NFP_BPF_CAP_TYPE_QUEUE_SELECT:
|
||
|
|
if (nfp_bpf_parse_cap_qsel(app->priv, value, length))
|
||
|
|
goto err_release_free;
|
||
|
|
break;
|
||
|
|
case NFP_BPF_CAP_TYPE_ADJUST_TAIL:
|
||
|
|
if (nfp_bpf_parse_cap_adjust_tail(app->priv, value,
|
||
|
|
length))
|
||
|
|
goto err_release_free;
|
||
|
|
break;
|
||
|
|
case NFP_BPF_CAP_TYPE_ABI_VERSION:
|
||
|
|
if (nfp_bpf_parse_cap_abi_version(app->priv, value,
|
||
|
|
length))
|
||
|
|
goto err_release_free;
|
||
|
|
break;
|
||
|
|
case NFP_BPF_CAP_TYPE_CMSG_MULTI_ENT:
|
||
|
|
if (nfp_bpf_parse_cap_cmsg_multi_ent(app->priv, value,
|
||
|
|
length))
|
||
|
|
goto err_release_free;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
nfp_dbg(cpp, "unknown BPF capability: %d\n", type);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (mem - start != nfp_cpp_area_size(area)) {
|
||
|
|
nfp_err(cpp, "BPF capabilities left after parsing, parsed:%zd total length:%zu\n",
|
||
|
|
mem - start, nfp_cpp_area_size(area));
|
||
|
|
goto err_release_free;
|
||
|
|
}
|
||
|
|
|
||
|
|
nfp_cpp_area_release_free(area);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
err_release_free:
|
||
|
|
nfp_err(cpp, "invalid BPF capabilities at offset:%zd\n", mem - start);
|
||
|
|
nfp_cpp_area_release_free(area);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void nfp_bpf_init_capabilities(struct nfp_app_bpf *bpf)
|
||
|
|
{
|
||
|
|
bpf->abi_version = 2; /* Original BPF ABI version */
|
||
|
|
}
|
||
|
|
|
||
|
|
static int nfp_bpf_ndo_init(struct nfp_app *app, struct net_device *netdev)
|
||
|
|
{
|
||
|
|
struct nfp_app_bpf *bpf = app->priv;
|
||
|
|
|
||
|
|
return bpf_offload_dev_netdev_register(bpf->bpf_dev, netdev);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void nfp_bpf_ndo_uninit(struct nfp_app *app, struct net_device *netdev)
|
||
|
|
{
|
||
|
|
struct nfp_app_bpf *bpf = app->priv;
|
||
|
|
|
||
|
|
bpf_offload_dev_netdev_unregister(bpf->bpf_dev, netdev);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int nfp_bpf_start(struct nfp_app *app)
|
||
|
|
{
|
||
|
|
struct nfp_app_bpf *bpf = app->priv;
|
||
|
|
|
||
|
|
if (app->ctrl->dp.mtu < nfp_bpf_ctrl_cmsg_min_mtu(bpf)) {
|
||
|
|
nfp_err(bpf->app->cpp,
|
||
|
|
"ctrl channel MTU below min required %u < %u\n",
|
||
|
|
app->ctrl->dp.mtu, nfp_bpf_ctrl_cmsg_min_mtu(bpf));
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (bpf->cmsg_multi_ent)
|
||
|
|
bpf->cmsg_cache_cnt = nfp_bpf_ctrl_cmsg_cache_cnt(bpf);
|
||
|
|
else
|
||
|
|
bpf->cmsg_cache_cnt = 1;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int nfp_bpf_init(struct nfp_app *app)
|
||
|
|
{
|
||
|
|
struct nfp_app_bpf *bpf;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
bpf = kzalloc(sizeof(*bpf), GFP_KERNEL);
|
||
|
|
if (!bpf)
|
||
|
|
return -ENOMEM;
|
||
|
|
bpf->app = app;
|
||
|
|
app->priv = bpf;
|
||
|
|
|
||
|
|
INIT_LIST_HEAD(&bpf->map_list);
|
||
|
|
|
||
|
|
err = nfp_ccm_init(&bpf->ccm, app);
|
||
|
|
if (err)
|
||
|
|
goto err_free_bpf;
|
||
|
|
|
||
|
|
err = rhashtable_init(&bpf->maps_neutral, &nfp_bpf_maps_neutral_params);
|
||
|
|
if (err)
|
||
|
|
goto err_clean_ccm;
|
||
|
|
|
||
|
|
nfp_bpf_init_capabilities(bpf);
|
||
|
|
|
||
|
|
err = nfp_bpf_parse_capabilities(app);
|
||
|
|
if (err)
|
||
|
|
goto err_free_neutral_maps;
|
||
|
|
|
||
|
|
if (bpf->abi_version < 3) {
|
||
|
|
bpf->cmsg_key_sz = CMSG_MAP_KEY_LW * 4;
|
||
|
|
bpf->cmsg_val_sz = CMSG_MAP_VALUE_LW * 4;
|
||
|
|
} else {
|
||
|
|
bpf->cmsg_key_sz = bpf->maps.max_key_sz;
|
||
|
|
bpf->cmsg_val_sz = bpf->maps.max_val_sz;
|
||
|
|
app->ctrl_mtu = nfp_bpf_ctrl_cmsg_mtu(bpf);
|
||
|
|
}
|
||
|
|
|
||
|
|
bpf->bpf_dev = bpf_offload_dev_create(&nfp_bpf_dev_ops, bpf);
|
||
|
|
err = PTR_ERR_OR_ZERO(bpf->bpf_dev);
|
||
|
|
if (err)
|
||
|
|
goto err_free_neutral_maps;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
err_free_neutral_maps:
|
||
|
|
rhashtable_destroy(&bpf->maps_neutral);
|
||
|
|
err_clean_ccm:
|
||
|
|
nfp_ccm_clean(&bpf->ccm);
|
||
|
|
err_free_bpf:
|
||
|
|
kfree(bpf);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void nfp_bpf_clean(struct nfp_app *app)
|
||
|
|
{
|
||
|
|
struct nfp_app_bpf *bpf = app->priv;
|
||
|
|
|
||
|
|
bpf_offload_dev_destroy(bpf->bpf_dev);
|
||
|
|
nfp_ccm_clean(&bpf->ccm);
|
||
|
|
WARN_ON(!list_empty(&bpf->map_list));
|
||
|
|
WARN_ON(bpf->maps_in_use || bpf->map_elems_in_use);
|
||
|
|
rhashtable_free_and_destroy(&bpf->maps_neutral,
|
||
|
|
nfp_check_rhashtable_empty, NULL);
|
||
|
|
kfree(bpf);
|
||
|
|
}
|
||
|
|
|
||
|
|
const struct nfp_app_type app_bpf = {
|
||
|
|
.id = NFP_APP_BPF_NIC,
|
||
|
|
.name = "ebpf",
|
||
|
|
|
||
|
|
.ctrl_cap_mask = 0,
|
||
|
|
|
||
|
|
.init = nfp_bpf_init,
|
||
|
|
.clean = nfp_bpf_clean,
|
||
|
|
.start = nfp_bpf_start,
|
||
|
|
|
||
|
|
.check_mtu = nfp_bpf_check_mtu,
|
||
|
|
|
||
|
|
.extra_cap = nfp_bpf_extra_cap,
|
||
|
|
|
||
|
|
.ndo_init = nfp_bpf_ndo_init,
|
||
|
|
.ndo_uninit = nfp_bpf_ndo_uninit,
|
||
|
|
|
||
|
|
.vnic_alloc = nfp_bpf_vnic_alloc,
|
||
|
|
.vnic_free = nfp_bpf_vnic_free,
|
||
|
|
|
||
|
|
.ctrl_msg_rx = nfp_bpf_ctrl_msg_rx,
|
||
|
|
.ctrl_msg_rx_raw = nfp_bpf_ctrl_msg_rx_raw,
|
||
|
|
|
||
|
|
.setup_tc = nfp_bpf_setup_tc,
|
||
|
|
.bpf = nfp_ndo_bpf,
|
||
|
|
.xdp_offload = nfp_bpf_xdp_offload,
|
||
|
|
};
|