1 /* 2 * Copyright (C) 2017 Netronome Systems, Inc. 3 * 4 * This software is dual licensed under the GNU General License Version 2, 5 * June 1991 as shown in the file COPYING in the top-level directory of this 6 * source tree or the BSD 2-Clause License provided below. You have the 7 * option to license this software under the complete terms of either license. 8 * 9 * The BSD 2-Clause License: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * 1. Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * 2. Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34 #include <net/pkt_cls.h> 35 36 #include "../nfpcore/nfp_cpp.h" 37 #include "../nfp_app.h" 38 #include "../nfp_main.h" 39 #include "../nfp_net.h" 40 #include "../nfp_port.h" 41 #include "main.h" 42 43 static bool nfp_net_ebpf_capable(struct nfp_net *nn) 44 { 45 #ifdef __LITTLE_ENDIAN 46 if (nn->cap & NFP_NET_CFG_CTRL_BPF && 47 nn_readb(nn, NFP_NET_CFG_BPF_ABI) == NFP_NET_BPF_ABI) 48 return true; 49 #endif 50 return false; 51 } 52 53 static int 54 nfp_bpf_xdp_offload(struct nfp_app *app, struct nfp_net *nn, 55 struct bpf_prog *prog) 56 { 57 bool running, xdp_running; 58 int ret; 59 60 if (!nfp_net_ebpf_capable(nn)) 61 return -EINVAL; 62 63 running = nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF; 64 xdp_running = running && nn->dp.bpf_offload_xdp; 65 66 if (!prog && !xdp_running) 67 return 0; 68 if (prog && running && !xdp_running) 69 return -EBUSY; 70 71 ret = nfp_net_bpf_offload(nn, prog, running); 72 /* Stop offload if replace not possible */ 73 if (ret && prog) 74 nfp_bpf_xdp_offload(app, nn, NULL); 75 76 nn->dp.bpf_offload_xdp = prog && !ret; 77 return ret; 78 } 79 80 static const char *nfp_bpf_extra_cap(struct nfp_app *app, struct nfp_net *nn) 81 { 82 return nfp_net_ebpf_capable(nn) ? "BPF" : ""; 83 } 84 85 static int 86 nfp_bpf_vnic_alloc(struct nfp_app *app, struct nfp_net *nn, unsigned int id) 87 { 88 int err; 89 90 nn->app_priv = kzalloc(sizeof(struct nfp_bpf_vnic), GFP_KERNEL); 91 if (!nn->app_priv) 92 return -ENOMEM; 93 94 err = nfp_app_nic_vnic_alloc(app, nn, id); 95 if (err) 96 goto err_free_priv; 97 98 return 0; 99 err_free_priv: 100 kfree(nn->app_priv); 101 return err; 102 } 103 104 static void nfp_bpf_vnic_free(struct nfp_app *app, struct nfp_net *nn) 105 { 106 struct nfp_bpf_vnic *bv = nn->app_priv; 107 108 if (nn->dp.bpf_offload_xdp) 109 nfp_bpf_xdp_offload(app, nn, NULL); 110 WARN_ON(bv->tc_prog); 111 kfree(bv); 112 } 113 114 static int nfp_bpf_setup_tc_block_cb(enum tc_setup_type type, 115 void *type_data, void *cb_priv) 116 { 117 struct tc_cls_bpf_offload *cls_bpf = type_data; 118 struct nfp_net *nn = cb_priv; 119 struct bpf_prog *oldprog; 120 struct nfp_bpf_vnic *bv; 121 int err; 122 123 if (type != TC_SETUP_CLSBPF || 124 !tc_can_offload(nn->dp.netdev) || 125 !nfp_net_ebpf_capable(nn) || 126 cls_bpf->common.protocol != htons(ETH_P_ALL) || 127 cls_bpf->common.chain_index) 128 return -EOPNOTSUPP; 129 130 /* Only support TC direct action */ 131 if (!cls_bpf->exts_integrated || 132 tcf_exts_has_actions(cls_bpf->exts)) { 133 nn_err(nn, "only direct action with no legacy actions supported\n"); 134 return -EOPNOTSUPP; 135 } 136 137 if (cls_bpf->command != TC_CLSBPF_OFFLOAD) 138 return -EOPNOTSUPP; 139 140 bv = nn->app_priv; 141 oldprog = cls_bpf->oldprog; 142 143 /* Don't remove if oldprog doesn't match driver's state */ 144 if (bv->tc_prog != oldprog) { 145 oldprog = NULL; 146 if (!cls_bpf->prog) 147 return 0; 148 } 149 150 err = nfp_net_bpf_offload(nn, cls_bpf->prog, oldprog); 151 if (err) 152 return err; 153 154 bv->tc_prog = cls_bpf->prog; 155 return 0; 156 } 157 158 static int nfp_bpf_setup_tc_block(struct net_device *netdev, 159 struct tc_block_offload *f) 160 { 161 struct nfp_net *nn = netdev_priv(netdev); 162 163 if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS) 164 return -EOPNOTSUPP; 165 166 switch (f->command) { 167 case TC_BLOCK_BIND: 168 return tcf_block_cb_register(f->block, 169 nfp_bpf_setup_tc_block_cb, 170 nn, nn); 171 case TC_BLOCK_UNBIND: 172 tcf_block_cb_unregister(f->block, 173 nfp_bpf_setup_tc_block_cb, 174 nn); 175 return 0; 176 default: 177 return -EOPNOTSUPP; 178 } 179 } 180 181 static int nfp_bpf_setup_tc(struct nfp_app *app, struct net_device *netdev, 182 enum tc_setup_type type, void *type_data) 183 { 184 switch (type) { 185 case TC_SETUP_BLOCK: 186 return nfp_bpf_setup_tc_block(netdev, type_data); 187 default: 188 return -EOPNOTSUPP; 189 } 190 } 191 192 static bool nfp_bpf_tc_busy(struct nfp_app *app, struct nfp_net *nn) 193 { 194 return nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF; 195 } 196 197 const struct nfp_app_type app_bpf = { 198 .id = NFP_APP_BPF_NIC, 199 .name = "ebpf", 200 201 .extra_cap = nfp_bpf_extra_cap, 202 203 .vnic_alloc = nfp_bpf_vnic_alloc, 204 .vnic_free = nfp_bpf_vnic_free, 205 206 .setup_tc = nfp_bpf_setup_tc, 207 .tc_busy = nfp_bpf_tc_busy, 208 .xdp_offload = nfp_bpf_xdp_offload, 209 210 .bpf_verifier_prep = nfp_bpf_verifier_prep, 211 .bpf_translate = nfp_bpf_translate, 212 .bpf_destroy = nfp_bpf_destroy, 213 }; 214