^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * Copyright (C) 2017 Netronome Systems, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * This software is licensed under the GNU General License Version 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * June 1991 as shown in the file COPYING in the top-level directory of this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * source tree.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/bpf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/bpf_verifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/rtnetlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <net/pkt_cls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include "netdevsim.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define pr_vlog(env, fmt, ...) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) bpf_verifier_log_write(env, "[netdevsim] " fmt, ##__VA_ARGS__)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct nsim_bpf_bound_prog {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct nsim_dev *nsim_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct bpf_prog *prog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct dentry *ddir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) const char *state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) bool is_loaded;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct list_head l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define NSIM_BPF_MAX_KEYS 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct nsim_bpf_bound_map {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct netdevsim *ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct bpf_offloaded_map *map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct mutex mutex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct nsim_map_entry {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) void *key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) void *value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) } entry[NSIM_BPF_MAX_KEYS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct list_head l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static int nsim_bpf_string_show(struct seq_file *file, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) const char **str = file->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (*str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) seq_printf(file, "%s\n", *str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) DEFINE_SHOW_ATTRIBUTE(nsim_bpf_string);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) nsim_bpf_verify_insn(struct bpf_verifier_env *env, int insn_idx, int prev_insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct nsim_bpf_bound_prog *state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) state = env->prog->aux->offload->dev_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (state->nsim_dev->bpf_bind_verifier_delay && !insn_idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) msleep(state->nsim_dev->bpf_bind_verifier_delay);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (insn_idx == env->prog->len - 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) pr_vlog(env, "Hello from netdevsim!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (!state->nsim_dev->bpf_bind_verifier_accept)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) ret = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static int nsim_bpf_finalize(struct bpf_verifier_env *env)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) static bool nsim_xdp_offload_active(struct netdevsim *ns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return ns->xdp_hw.prog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) static void nsim_prog_set_loaded(struct bpf_prog *prog, bool loaded)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) struct nsim_bpf_bound_prog *state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (!prog || !prog->aux->offload)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) state = prog->aux->offload->dev_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) state->is_loaded = loaded;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) nsim_bpf_offload(struct netdevsim *ns, struct bpf_prog *prog, bool oldprog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) nsim_prog_set_loaded(ns->bpf_offloaded, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) WARN(!!ns->bpf_offloaded != oldprog,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) "bad offload state, expected offload %sto be active",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) oldprog ? "" : "not ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) ns->bpf_offloaded = prog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) ns->bpf_offloaded_id = prog ? prog->aux->id : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) nsim_prog_set_loaded(prog, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) void *type_data, void *cb_priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) struct tc_cls_bpf_offload *cls_bpf = type_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) struct bpf_prog *prog = cls_bpf->prog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct netdevsim *ns = cb_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct bpf_prog *oldprog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (type != TC_SETUP_CLSBPF) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) NSIM_EA(cls_bpf->common.extack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) "only offload of BPF classifiers supported");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (!tc_cls_can_offload_and_chain0(ns->netdev, &cls_bpf->common))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (cls_bpf->common.protocol != htons(ETH_P_ALL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) NSIM_EA(cls_bpf->common.extack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) "only ETH_P_ALL supported as filter protocol");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (!ns->bpf_tc_accept) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) NSIM_EA(cls_bpf->common.extack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) "netdevsim configured to reject BPF TC offload");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) /* Note: progs without skip_sw will probably not be dev bound */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (prog && !prog->aux->offload && !ns->bpf_tc_non_bound_accept) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) NSIM_EA(cls_bpf->common.extack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) "netdevsim configured to reject unbound programs");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (cls_bpf->command != TC_CLSBPF_OFFLOAD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) oldprog = cls_bpf->oldprog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) /* Don't remove if oldprog doesn't match driver's state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) if (ns->bpf_offloaded != oldprog) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) oldprog = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) if (!cls_bpf->prog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) if (ns->bpf_offloaded) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) NSIM_EA(cls_bpf->common.extack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) "driver and netdev offload states mismatch");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) return nsim_bpf_offload(ns, cls_bpf->prog, oldprog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) int nsim_bpf_disable_tc(struct netdevsim *ns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) if (ns->bpf_offloaded && !nsim_xdp_offload_active(ns))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) static int nsim_xdp_offload_prog(struct netdevsim *ns, struct netdev_bpf *bpf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (!nsim_xdp_offload_active(ns) && !bpf->prog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if (!nsim_xdp_offload_active(ns) && bpf->prog && ns->bpf_offloaded) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) NSIM_EA(bpf->extack, "TC program is already loaded");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return nsim_bpf_offload(ns, bpf->prog, nsim_xdp_offload_active(ns));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) nsim_xdp_set_prog(struct netdevsim *ns, struct netdev_bpf *bpf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) struct xdp_attachment_info *xdp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (bpf->command == XDP_SETUP_PROG && !ns->bpf_xdpdrv_accept) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) NSIM_EA(bpf->extack, "driver XDP disabled in DebugFS");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (bpf->command == XDP_SETUP_PROG_HW && !ns->bpf_xdpoffload_accept) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) NSIM_EA(bpf->extack, "XDP offload disabled in DebugFS");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (bpf->command == XDP_SETUP_PROG_HW) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) err = nsim_xdp_offload_prog(ns, bpf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) xdp_attachment_setup(xdp, bpf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) static int nsim_bpf_create_prog(struct nsim_dev *nsim_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) struct bpf_prog *prog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) struct nsim_bpf_bound_prog *state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) char name[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) state = kzalloc(sizeof(*state), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) if (!state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) state->nsim_dev = nsim_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) state->prog = prog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) state->state = "verify";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) /* Program id is not populated yet when we create the state. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) sprintf(name, "%u", nsim_dev->prog_id_gen++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) state->ddir = debugfs_create_dir(name, nsim_dev->ddir_bpf_bound_progs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (IS_ERR(state->ddir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) ret = PTR_ERR(state->ddir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) kfree(state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) debugfs_create_u32("id", 0400, state->ddir, &prog->aux->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) debugfs_create_file("state", 0400, state->ddir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) &state->state, &nsim_bpf_string_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) debugfs_create_bool("loaded", 0400, state->ddir, &state->is_loaded);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) list_add_tail(&state->l, &nsim_dev->bpf_bound_progs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) prog->aux->offload->dev_priv = state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) static int nsim_bpf_verifier_prep(struct bpf_prog *prog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) struct nsim_dev *nsim_dev =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) bpf_offload_dev_priv(prog->aux->offload->offdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) if (!nsim_dev->bpf_bind_accept)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return nsim_bpf_create_prog(nsim_dev, prog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) static int nsim_bpf_translate(struct bpf_prog *prog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) struct nsim_bpf_bound_prog *state = prog->aux->offload->dev_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) state->state = "xlated";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) static void nsim_bpf_destroy_prog(struct bpf_prog *prog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) struct nsim_bpf_bound_prog *state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) state = prog->aux->offload->dev_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) WARN(state->is_loaded,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) "offload state destroyed while program still bound");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) debugfs_remove_recursive(state->ddir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) list_del(&state->l);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) kfree(state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) static const struct bpf_prog_offload_ops nsim_bpf_dev_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) .insn_hook = nsim_bpf_verify_insn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) .finalize = nsim_bpf_finalize,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) .prepare = nsim_bpf_verifier_prep,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) .translate = nsim_bpf_translate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) .destroy = nsim_bpf_destroy_prog,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) static int nsim_setup_prog_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) if (bpf->prog && bpf->prog->aux->offload) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) NSIM_EA(bpf->extack, "attempt to load offloaded prog to drv");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) if (ns->netdev->mtu > NSIM_XDP_MAX_MTU) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) NSIM_EA(bpf->extack, "MTU too large w/ XDP enabled");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) nsim_setup_prog_hw_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) struct nsim_bpf_bound_prog *state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) if (!bpf->prog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if (!bpf->prog->aux->offload) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) NSIM_EA(bpf->extack, "xdpoffload of non-bound program");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) if (!bpf_offload_dev_match(bpf->prog, ns->netdev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) NSIM_EA(bpf->extack, "program bound to different dev");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) state = bpf->prog->aux->offload->dev_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) if (WARN_ON(strcmp(state->state, "xlated"))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) NSIM_EA(bpf->extack, "offloading program in bad state");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) static bool
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) nsim_map_key_match(struct bpf_map *map, struct nsim_map_entry *e, void *key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) return e->key && !memcmp(key, e->key, map->key_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) static int nsim_map_key_find(struct bpf_offloaded_map *offmap, void *key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) for (i = 0; i < ARRAY_SIZE(nmap->entry); i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (nsim_map_key_match(&offmap->map, &nmap->entry[i], key))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) nsim_map_alloc_elem(struct bpf_offloaded_map *offmap, unsigned int idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) nmap->entry[idx].key = kmalloc(offmap->map.key_size, GFP_USER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) if (!nmap->entry[idx].key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) nmap->entry[idx].value = kmalloc(offmap->map.value_size, GFP_USER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) if (!nmap->entry[idx].value) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) kfree(nmap->entry[idx].key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) nmap->entry[idx].key = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) nsim_map_get_next_key(struct bpf_offloaded_map *offmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) void *key, void *next_key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) int idx = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) mutex_lock(&nmap->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) if (key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) idx = nsim_map_key_find(offmap, key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) if (idx == -ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) idx++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) for (; idx < ARRAY_SIZE(nmap->entry); idx++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) if (nmap->entry[idx].key) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) memcpy(next_key, nmap->entry[idx].key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) offmap->map.key_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) mutex_unlock(&nmap->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) if (idx == ARRAY_SIZE(nmap->entry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) nsim_map_lookup_elem(struct bpf_offloaded_map *offmap, void *key, void *value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) mutex_lock(&nmap->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) idx = nsim_map_key_find(offmap, key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) if (idx >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) memcpy(value, nmap->entry[idx].value, offmap->map.value_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) mutex_unlock(&nmap->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) return idx < 0 ? idx : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) nsim_map_update_elem(struct bpf_offloaded_map *offmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) void *key, void *value, u64 flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) int idx, err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) mutex_lock(&nmap->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) idx = nsim_map_key_find(offmap, key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) if (idx < 0 && flags == BPF_EXIST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) err = idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) goto exit_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) if (idx >= 0 && flags == BPF_NOEXIST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) err = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) goto exit_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) if (idx < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) for (idx = 0; idx < ARRAY_SIZE(nmap->entry); idx++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) if (!nmap->entry[idx].key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) if (idx == ARRAY_SIZE(nmap->entry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) err = -E2BIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) goto exit_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) err = nsim_map_alloc_elem(offmap, idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) goto exit_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) memcpy(nmap->entry[idx].key, key, offmap->map.key_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) memcpy(nmap->entry[idx].value, value, offmap->map.value_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) exit_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) mutex_unlock(&nmap->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) static int nsim_map_delete_elem(struct bpf_offloaded_map *offmap, void *key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) mutex_lock(&nmap->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) idx = nsim_map_key_find(offmap, key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) if (idx >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) kfree(nmap->entry[idx].key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) kfree(nmap->entry[idx].value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) memset(&nmap->entry[idx], 0, sizeof(nmap->entry[idx]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) mutex_unlock(&nmap->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) return idx < 0 ? idx : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) static const struct bpf_map_dev_ops nsim_bpf_map_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) .map_get_next_key = nsim_map_get_next_key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) .map_lookup_elem = nsim_map_lookup_elem,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) .map_update_elem = nsim_map_update_elem,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) .map_delete_elem = nsim_map_delete_elem,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) nsim_bpf_map_alloc(struct netdevsim *ns, struct bpf_offloaded_map *offmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) struct nsim_bpf_bound_map *nmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) int i, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) if (WARN_ON(offmap->map.map_type != BPF_MAP_TYPE_ARRAY &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) offmap->map.map_type != BPF_MAP_TYPE_HASH))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) if (offmap->map.max_entries > NSIM_BPF_MAX_KEYS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) if (offmap->map.map_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) nmap = kzalloc(sizeof(*nmap), GFP_USER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) if (!nmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) offmap->dev_priv = nmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) nmap->ns = ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) nmap->map = offmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) mutex_init(&nmap->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) u32 *key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) err = nsim_map_alloc_elem(offmap, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) goto err_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) key = nmap->entry[i].key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) *key = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) memset(nmap->entry[i].value, 0, offmap->map.value_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) offmap->dev_ops = &nsim_bpf_map_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) list_add_tail(&nmap->l, &ns->nsim_dev->bpf_bound_maps);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) err_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) while (--i >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) kfree(nmap->entry[i].key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) kfree(nmap->entry[i].value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) kfree(nmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) static void nsim_bpf_map_free(struct bpf_offloaded_map *offmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) kfree(nmap->entry[i].key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) kfree(nmap->entry[i].value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) list_del_init(&nmap->l);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) mutex_destroy(&nmap->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) kfree(nmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) struct netdevsim *ns = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) ASSERT_RTNL();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) switch (bpf->command) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) case XDP_SETUP_PROG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) err = nsim_setup_prog_checks(ns, bpf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) return nsim_xdp_set_prog(ns, bpf, &ns->xdp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) case XDP_SETUP_PROG_HW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) err = nsim_setup_prog_hw_checks(ns, bpf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) return nsim_xdp_set_prog(ns, bpf, &ns->xdp_hw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) case BPF_OFFLOAD_MAP_ALLOC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) if (!ns->bpf_map_accept)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) return nsim_bpf_map_alloc(ns, bpf->offmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) case BPF_OFFLOAD_MAP_FREE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) nsim_bpf_map_free(bpf->offmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) int nsim_bpf_dev_init(struct nsim_dev *nsim_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) INIT_LIST_HEAD(&nsim_dev->bpf_bound_progs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) INIT_LIST_HEAD(&nsim_dev->bpf_bound_maps);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) nsim_dev->ddir_bpf_bound_progs = debugfs_create_dir("bpf_bound_progs",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) nsim_dev->ddir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) if (IS_ERR(nsim_dev->ddir_bpf_bound_progs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) return PTR_ERR(nsim_dev->ddir_bpf_bound_progs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) nsim_dev->bpf_dev = bpf_offload_dev_create(&nsim_bpf_dev_ops, nsim_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) err = PTR_ERR_OR_ZERO(nsim_dev->bpf_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) nsim_dev->bpf_bind_accept = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) debugfs_create_bool("bpf_bind_accept", 0600, nsim_dev->ddir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) &nsim_dev->bpf_bind_accept);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) debugfs_create_u32("bpf_bind_verifier_delay", 0600, nsim_dev->ddir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) &nsim_dev->bpf_bind_verifier_delay);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) nsim_dev->bpf_bind_verifier_accept = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) debugfs_create_bool("bpf_bind_verifier_accept", 0600, nsim_dev->ddir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) &nsim_dev->bpf_bind_verifier_accept);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) void nsim_bpf_dev_exit(struct nsim_dev *nsim_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) WARN_ON(!list_empty(&nsim_dev->bpf_bound_progs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) WARN_ON(!list_empty(&nsim_dev->bpf_bound_maps));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) bpf_offload_dev_destroy(nsim_dev->bpf_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) int nsim_bpf_init(struct netdevsim *ns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) struct dentry *ddir = ns->nsim_dev_port->ddir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) err = bpf_offload_dev_netdev_register(ns->nsim_dev->bpf_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) ns->netdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) debugfs_create_u32("bpf_offloaded_id", 0400, ddir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) &ns->bpf_offloaded_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) ns->bpf_tc_accept = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) debugfs_create_bool("bpf_tc_accept", 0600, ddir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) &ns->bpf_tc_accept);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) debugfs_create_bool("bpf_tc_non_bound_accept", 0600, ddir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) &ns->bpf_tc_non_bound_accept);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) ns->bpf_xdpdrv_accept = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) debugfs_create_bool("bpf_xdpdrv_accept", 0600, ddir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) &ns->bpf_xdpdrv_accept);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) ns->bpf_xdpoffload_accept = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) debugfs_create_bool("bpf_xdpoffload_accept", 0600, ddir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) &ns->bpf_xdpoffload_accept);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) ns->bpf_map_accept = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) debugfs_create_bool("bpf_map_accept", 0600, ddir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) &ns->bpf_map_accept);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) void nsim_bpf_uninit(struct netdevsim *ns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) WARN_ON(ns->xdp.prog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) WARN_ON(ns->xdp_hw.prog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) WARN_ON(ns->bpf_offloaded);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) bpf_offload_dev_netdev_unregister(ns->nsim_dev->bpf_dev, ns->netdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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