drivers/net/ethernet/netronome/nfp/bpf/main.c

   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         struct tc_cls_bpf_offload cmd = {
  58                 .prog = prog,
  59         };
  60         int ret;
  61
  62         if (!nfp_net_ebpf_capable(nn))
  63                 return -EINVAL;
  64
  65         if (nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF) {
  66                 if (!nn->dp.bpf_offload_xdp)
  67                         return prog ? -EBUSY : 0;
  68                 cmd.command = prog ? TC_CLSBPF_REPLACE : TC_CLSBPF_DESTROY;
  69         } else {
  70                 if (!prog)
  71                         return 0;
  72                 cmd.command = TC_CLSBPF_ADD;
  73         }
  74
  75         ret = nfp_net_bpf_offload(nn, &cmd);
  76         /* Stop offload if replace not possible */
  77         if (ret && cmd.command == TC_CLSBPF_REPLACE)
  78                 nfp_bpf_xdp_offload(app, nn, NULL);
  79         nn->dp.bpf_offload_xdp = prog && !ret;
  80         return ret;
  81 }
  82
  83 static const char *nfp_bpf_extra_cap(struct nfp_app *app, struct nfp_net *nn)
  84 {
  85         return nfp_net_ebpf_capable(nn) ? "BPF" : "";
  86 }
  87
  88 static void nfp_bpf_vnic_free(struct nfp_app *app, struct nfp_net *nn)
  89 {
  90         if (nn->dp.bpf_offload_xdp)
  91                 nfp_bpf_xdp_offload(app, nn, NULL);
  92 }
  93
  94 static int nfp_bpf_setup_tc_block_cb(enum tc_setup_type type,
  95                                      void *type_data, void *cb_priv)
  96 {
  97         struct tc_cls_bpf_offload *cls_bpf = type_data;
  98         struct nfp_net *nn = cb_priv;
  99
 100         if (!tc_can_offload(nn->dp.netdev))
 101                 return -EOPNOTSUPP;
 102
 103         switch (type) {
 104         case TC_SETUP_CLSBPF:
 105                 if (!nfp_net_ebpf_capable(nn) ||
 106                     cls_bpf->common.protocol != htons(ETH_P_ALL) ||
 107                     cls_bpf->common.chain_index)
 108                         return -EOPNOTSUPP;
 109                 if (nn->dp.bpf_offload_xdp)
 110                         return -EBUSY;
 111
 112                 /* Only support TC direct action */
 113                 if (!cls_bpf->exts_integrated ||
 114                     tcf_exts_has_actions(cls_bpf->exts)) {
 115                         nn_err(nn, "only direct action with no legacy actions supported\n");
 116                         return -EOPNOTSUPP;
 117                 }
 118
 119                 return nfp_net_bpf_offload(nn, cls_bpf);
 120         default:
 121                 return -EOPNOTSUPP;
 122         }
 123 }
 124
 125 static int nfp_bpf_setup_tc_block(struct net_device *netdev,
 126                                   struct tc_block_offload *f)
 127 {
 128         struct nfp_net *nn = netdev_priv(netdev);
 129
 130         if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 131                 return -EOPNOTSUPP;
 132
 133         switch (f->command) {
 134         case TC_BLOCK_BIND:
 135                 return tcf_block_cb_register(f->block,
 136                                              nfp_bpf_setup_tc_block_cb,
 137                                              nn, nn);
 138         case TC_BLOCK_UNBIND:
 139                 tcf_block_cb_unregister(f->block,
 140                                         nfp_bpf_setup_tc_block_cb,
 141                                         nn);
 142                 return 0;
 143         default:
 144                 return -EOPNOTSUPP;
 145         }
 146 }
 147
 148 static int nfp_bpf_setup_tc(struct nfp_app *app, struct net_device *netdev,
 149                             enum tc_setup_type type, void *type_data)
 150 {
 151         switch (type) {
 152         case TC_SETUP_BLOCK:
 153                 return nfp_bpf_setup_tc_block(netdev, type_data);
 154         default:
 155                 return -EOPNOTSUPP;
 156         }
 157 }
 158
 159 static bool nfp_bpf_tc_busy(struct nfp_app *app, struct nfp_net *nn)
 160 {
 161         return nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF;
 162 }
 163
 164 const struct nfp_app_type app_bpf = {
 165         .id             = NFP_APP_BPF_NIC,
 166         .name           = "ebpf",
 167
 168         .extra_cap      = nfp_bpf_extra_cap,
 169
 170         .vnic_alloc     = nfp_app_nic_vnic_alloc,
 171         .vnic_free      = nfp_bpf_vnic_free,
 172
 173         .setup_tc       = nfp_bpf_setup_tc,
 174         .tc_busy        = nfp_bpf_tc_busy,
 175         .xdp_offload    = nfp_bpf_xdp_offload,
 176 };