netdevsim: add bpf offload support
Add support for loading programs for netdevsim devices and
expose the related information via DebugFS. Both offload
of XDP and cls_bpf programs is supported.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
diff --git a/drivers/net/netdevsim/bpf.c b/drivers/net/netdevsim/bpf.c
new file mode 100644
index 0000000..8e4398a
--- /dev/null
+++ b/drivers/net/netdevsim/bpf.c
@@ -0,0 +1,373 @@
+/*
+ * Copyright (C) 2017 Netronome Systems, Inc.
+ *
+ * This software is 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.
+ *
+ * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
+ * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
+ * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
+ * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+ */
+
+#include <linux/bpf.h>
+#include <linux/bpf_verifier.h>
+#include <linux/debugfs.h>
+#include <linux/kernel.h>
+#include <linux/rtnetlink.h>
+#include <net/pkt_cls.h>
+
+#include "netdevsim.h"
+
+struct nsim_bpf_bound_prog {
+ struct netdevsim *ns;
+ struct bpf_prog *prog;
+ struct dentry *ddir;
+ const char *state;
+ bool is_loaded;
+ struct list_head l;
+};
+
+static int nsim_debugfs_bpf_string_read(struct seq_file *file, void *data)
+{
+ const char **str = file->private;
+
+ if (*str)
+ seq_printf(file, "%s\n", *str);
+
+ return 0;
+}
+
+static int nsim_debugfs_bpf_string_open(struct inode *inode, struct file *f)
+{
+ return single_open(f, nsim_debugfs_bpf_string_read, inode->i_private);
+}
+
+static const struct file_operations nsim_bpf_string_fops = {
+ .owner = THIS_MODULE,
+ .open = nsim_debugfs_bpf_string_open,
+ .release = single_release,
+ .read = seq_read,
+ .llseek = seq_lseek
+};
+
+static int
+nsim_bpf_verify_insn(struct bpf_verifier_env *env, int insn_idx, int prev_insn)
+{
+ struct nsim_bpf_bound_prog *state;
+
+ state = env->prog->aux->offload->dev_priv;
+ if (state->ns->bpf_bind_verifier_delay && !insn_idx)
+ msleep(state->ns->bpf_bind_verifier_delay);
+
+ return 0;
+}
+
+static const struct bpf_ext_analyzer_ops nsim_bpf_analyzer_ops = {
+ .insn_hook = nsim_bpf_verify_insn,
+};
+
+static bool nsim_xdp_offload_active(struct netdevsim *ns)
+{
+ return ns->xdp_prog_mode == XDP_ATTACHED_HW;
+}
+
+static void nsim_prog_set_loaded(struct bpf_prog *prog, bool loaded)
+{
+ struct nsim_bpf_bound_prog *state;
+
+ if (!prog || !prog->aux->offload)
+ return;
+
+ state = prog->aux->offload->dev_priv;
+ state->is_loaded = loaded;
+}
+
+static int
+nsim_bpf_offload(struct netdevsim *ns, struct bpf_prog *prog, bool oldprog)
+{
+ nsim_prog_set_loaded(ns->bpf_offloaded, false);
+
+ WARN(!!ns->bpf_offloaded != oldprog,
+ "bad offload state, expected offload %sto be active",
+ oldprog ? "" : "not ");
+ ns->bpf_offloaded = prog;
+ ns->bpf_offloaded_id = prog ? prog->aux->id : 0;
+ nsim_prog_set_loaded(prog, true);
+
+ return 0;
+}
+
+int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
+ void *type_data, void *cb_priv)
+{
+ struct tc_cls_bpf_offload *cls_bpf = type_data;
+ struct bpf_prog *prog = cls_bpf->prog;
+ struct netdevsim *ns = cb_priv;
+ bool skip_sw;
+
+ if (type != TC_SETUP_CLSBPF ||
+ !tc_can_offload(ns->netdev) ||
+ cls_bpf->common.protocol != htons(ETH_P_ALL) ||
+ cls_bpf->common.chain_index)
+ return -EOPNOTSUPP;
+
+ skip_sw = cls_bpf->gen_flags & TCA_CLS_FLAGS_SKIP_SW;
+
+ if (nsim_xdp_offload_active(ns))
+ return -EBUSY;
+
+ if (!ns->bpf_tc_accept)
+ return -EOPNOTSUPP;
+ /* Note: progs without skip_sw will probably not be dev bound */
+ if (prog && !prog->aux->offload && !ns->bpf_tc_non_bound_accept)
+ return -EOPNOTSUPP;
+
+ switch (cls_bpf->command) {
+ case TC_CLSBPF_REPLACE:
+ return nsim_bpf_offload(ns, prog, true);
+ case TC_CLSBPF_ADD:
+ return nsim_bpf_offload(ns, prog, false);
+ case TC_CLSBPF_DESTROY:
+ return nsim_bpf_offload(ns, NULL, true);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+int nsim_bpf_disable_tc(struct netdevsim *ns)
+{
+ if (ns->bpf_offloaded && !nsim_xdp_offload_active(ns))
+ return -EBUSY;
+ return 0;
+}
+
+static int nsim_xdp_offload_prog(struct netdevsim *ns, struct netdev_bpf *bpf)
+{
+ if (!nsim_xdp_offload_active(ns) && !bpf->prog)
+ return 0;
+ if (!nsim_xdp_offload_active(ns) && bpf->prog && ns->bpf_offloaded) {
+ NSIM_EA(bpf->extack, "TC program is already loaded");
+ return -EBUSY;
+ }
+
+ return nsim_bpf_offload(ns, bpf->prog, nsim_xdp_offload_active(ns));
+}
+
+static int nsim_xdp_set_prog(struct netdevsim *ns, struct netdev_bpf *bpf)
+{
+ int err;
+
+ if (ns->xdp_prog && (bpf->flags ^ ns->xdp_flags) & XDP_FLAGS_MODES) {
+ NSIM_EA(bpf->extack, "program loaded with different flags");
+ return -EBUSY;
+ }
+
+ if (bpf->command == XDP_SETUP_PROG && !ns->bpf_xdpdrv_accept) {
+ NSIM_EA(bpf->extack, "driver XDP disabled in DebugFS");
+ return -EOPNOTSUPP;
+ }
+ if (bpf->command == XDP_SETUP_PROG_HW && !ns->bpf_xdpoffload_accept) {
+ NSIM_EA(bpf->extack, "XDP offload disabled in DebugFS");
+ return -EOPNOTSUPP;
+ }
+
+ if (bpf->command == XDP_SETUP_PROG_HW) {
+ err = nsim_xdp_offload_prog(ns, bpf);
+ if (err)
+ return err;
+ }
+
+ if (ns->xdp_prog)
+ bpf_prog_put(ns->xdp_prog);
+
+ ns->xdp_prog = bpf->prog;
+ ns->xdp_flags = bpf->flags;
+
+ if (!bpf->prog)
+ ns->xdp_prog_mode = XDP_ATTACHED_NONE;
+ else if (bpf->command == XDP_SETUP_PROG)
+ ns->xdp_prog_mode = XDP_ATTACHED_DRV;
+ else
+ ns->xdp_prog_mode = XDP_ATTACHED_HW;
+
+ return 0;
+}
+
+int nsim_bpf_create_prog(struct netdevsim *ns, struct bpf_prog *prog)
+{
+ struct nsim_bpf_bound_prog *state;
+ char name[16];
+ int err;
+
+ state = kzalloc(sizeof(*state), GFP_KERNEL);
+ if (!state)
+ return -ENOMEM;
+
+ state->ns = ns;
+ state->prog = prog;
+ state->state = "verify";
+
+ /* Program id is not populated yet when we create the state. */
+ sprintf(name, "%u", ns->prog_id_gen++);
+ state->ddir = debugfs_create_dir(name, ns->ddir_bpf_bound_progs);
+ if (IS_ERR(state->ddir)) {
+ err = PTR_ERR(state->ddir);
+ kfree(state);
+ return err;
+ }
+
+ debugfs_create_u32("id", 0400, state->ddir, &prog->aux->id);
+ debugfs_create_file("state", 0400, state->ddir,
+ &state->state, &nsim_bpf_string_fops);
+ debugfs_create_bool("loaded", 0400, state->ddir, &state->is_loaded);
+
+ list_add_tail(&state->l, &ns->bpf_bound_progs);
+
+ prog->aux->offload->dev_priv = state;
+
+ return 0;
+}
+
+void nsim_bpf_destroy_prog(struct bpf_prog *prog)
+{
+ struct nsim_bpf_bound_prog *state;
+
+ state = prog->aux->offload->dev_priv;
+ WARN(state->is_loaded,
+ "offload state destroyed while program still bound");
+ debugfs_remove_recursive(state->ddir);
+ list_del(&state->l);
+ kfree(state);
+}
+
+static int nsim_setup_prog_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
+{
+ if (bpf->prog && bpf->prog->aux->offload) {
+ NSIM_EA(bpf->extack, "attempt to load offloaded prog to drv");
+ return -EINVAL;
+ }
+ if (ns->netdev->mtu > NSIM_XDP_MAX_MTU) {
+ NSIM_EA(bpf->extack, "MTU too large w/ XDP enabled");
+ return -EINVAL;
+ }
+ if (nsim_xdp_offload_active(ns)) {
+ NSIM_EA(bpf->extack, "xdp offload active, can't load drv prog");
+ return -EBUSY;
+ }
+ return 0;
+}
+
+static int
+nsim_setup_prog_hw_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
+{
+ struct nsim_bpf_bound_prog *state;
+
+ if (!bpf->prog)
+ return 0;
+
+ if (!bpf->prog->aux->offload) {
+ NSIM_EA(bpf->extack, "xdpoffload of non-bound program");
+ return -EINVAL;
+ }
+ if (bpf->prog->aux->offload->netdev != ns->netdev) {
+ NSIM_EA(bpf->extack, "program bound to different dev");
+ return -EINVAL;
+ }
+
+ state = bpf->prog->aux->offload->dev_priv;
+ if (WARN_ON(strcmp(state->state, "xlated"))) {
+ NSIM_EA(bpf->extack, "offloading program in bad state");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf)
+{
+ struct netdevsim *ns = netdev_priv(dev);
+ struct nsim_bpf_bound_prog *state;
+ int err;
+
+ ASSERT_RTNL();
+
+ switch (bpf->command) {
+ case BPF_OFFLOAD_VERIFIER_PREP:
+ if (!ns->bpf_bind_accept)
+ return -EOPNOTSUPP;
+
+ err = nsim_bpf_create_prog(ns, bpf->verifier.prog);
+ if (err)
+ return err;
+
+ bpf->verifier.ops = &nsim_bpf_analyzer_ops;
+ return 0;
+ case BPF_OFFLOAD_TRANSLATE:
+ state = bpf->offload.prog->aux->offload->dev_priv;
+
+ state->state = "xlated";
+ return 0;
+ case BPF_OFFLOAD_DESTROY:
+ nsim_bpf_destroy_prog(bpf->offload.prog);
+ return 0;
+ case XDP_QUERY_PROG:
+ bpf->prog_attached = ns->xdp_prog_mode;
+ bpf->prog_id = ns->xdp_prog ? ns->xdp_prog->aux->id : 0;
+ bpf->prog_flags = ns->xdp_prog ? ns->xdp_flags : 0;
+ return 0;
+ case XDP_SETUP_PROG:
+ err = nsim_setup_prog_checks(ns, bpf);
+ if (err)
+ return err;
+
+ return nsim_xdp_set_prog(ns, bpf);
+ case XDP_SETUP_PROG_HW:
+ err = nsim_setup_prog_hw_checks(ns, bpf);
+ if (err)
+ return err;
+
+ return nsim_xdp_set_prog(ns, bpf);
+ default:
+ return -EINVAL;
+ }
+}
+
+int nsim_bpf_init(struct netdevsim *ns)
+{
+ INIT_LIST_HEAD(&ns->bpf_bound_progs);
+
+ debugfs_create_u32("bpf_offloaded_id", 0400, ns->ddir,
+ &ns->bpf_offloaded_id);
+
+ ns->bpf_bind_accept = true;
+ debugfs_create_bool("bpf_bind_accept", 0600, ns->ddir,
+ &ns->bpf_bind_accept);
+ debugfs_create_u32("bpf_bind_verifier_delay", 0600, ns->ddir,
+ &ns->bpf_bind_verifier_delay);
+ ns->ddir_bpf_bound_progs =
+ debugfs_create_dir("bpf_bound_progs", ns->ddir);
+
+ ns->bpf_tc_accept = true;
+ debugfs_create_bool("bpf_tc_accept", 0600, ns->ddir,
+ &ns->bpf_tc_accept);
+ debugfs_create_bool("bpf_tc_non_bound_accept", 0600, ns->ddir,
+ &ns->bpf_tc_non_bound_accept);
+ ns->bpf_xdpdrv_accept = true;
+ debugfs_create_bool("bpf_xdpdrv_accept", 0600, ns->ddir,
+ &ns->bpf_xdpdrv_accept);
+ ns->bpf_xdpoffload_accept = true;
+ debugfs_create_bool("bpf_xdpoffload_accept", 0600, ns->ddir,
+ &ns->bpf_xdpoffload_accept);
+
+ return 0;
+}
+
+void nsim_bpf_uninit(struct netdevsim *ns)
+{
+ WARN_ON(!list_empty(&ns->bpf_bound_progs));
+ WARN_ON(ns->xdp_prog);
+ WARN_ON(ns->bpf_offloaded);
+}