[PATCH bpf-next v5 04/17] bpf: Reshuffle some parts of bpf/offload.c

Stanislav Fomichev
2022-12-20T22:21:08Z

To avoid adding forward declarations in the main patch, shuffle
some code around. No functional changes.

Cc: John Fastabend <john.fastabend@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Anatoly Burakov <anatoly.burakov@intel.com>
Cc: Alexander Lobakin <alexandr.lobakin@intel.com>
Cc: Magnus Karlsson <magnus.karlsson@gmail.com>
Cc: Maryam Tahhan <mtahhan@redhat.com>
Cc: xdp-hints@xdp-project.net
Cc: netdev@vger.kernel.org
Signed-off-by: Stanislav Fomichev <sdf@google.com>
---
kernel/bpf/offload.c | 222 +++++++++++++++++++++++--------------------
1 file changed, 117 insertions(+), 105 deletions(-)

diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
index 621e8738f304..deb06498da0b 100644
--- a/kernel/bpf/offload.c
+++ b/kernel/bpf/offload.c
@@ -74,6 +74,121 @@ bpf_offload_find_netdev(struct net_device *netdev)
return rhashtable_lookup_fast(&offdevs, &netdev, offdevs_params);
}

+static int __bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
+ struct net_device *netdev)
+{
+ struct bpf_offload_netdev *ondev;
+ int err;
+
+ ondev = kzalloc(sizeof(*ondev), GFP_KERNEL);
+ if (!ondev)
+ return -ENOMEM;
+
+ ondev->netdev = netdev;
+ ondev->offdev = offdev;
+ INIT_LIST_HEAD(&ondev->progs);
+ INIT_LIST_HEAD(&ondev->maps);
+
+ down_write(&bpf_devs_lock);
+ err = rhashtable_insert_fast(&offdevs, &ondev->l, offdevs_params);
+ if (err) {
+ netdev_warn(netdev, "failed to register for BPF offload\n");
+ goto err_unlock_free;
+ }
+
+ list_add(&ondev->offdev_netdevs, &offdev->netdevs);
+ up_write(&bpf_devs_lock);
+ return 0;
+
+err_unlock_free:
+ up_write(&bpf_devs_lock);
+ kfree(ondev);
+ return err;
+}
+
+static void __bpf_prog_offload_destroy(struct bpf_prog *prog)
+{
+ struct bpf_prog_offload *offload = prog->aux->offload;
+
+ if (offload->dev_state)
+ offload->offdev->ops->destroy(prog);
+
+ /* Make sure BPF_PROG_GET_NEXT_ID can't find this dead program */
+ bpf_prog_free_id(prog, true);
+
+ list_del_init(&offload->offloads);
+ kfree(offload);
+ prog->aux->offload = NULL;
+}
+
+static int bpf_map_offload_ndo(struct bpf_offloaded_map *offmap,
+ enum bpf_netdev_command cmd)
+{
+ struct netdev_bpf data = {};
+ struct net_device *netdev;
+
+ ASSERT_RTNL();
+
+ data.command = cmd;
+ data.offmap = offmap;
+ /* Caller must make sure netdev is valid */
+ netdev = offmap->netdev;
+
+ return netdev->netdev_ops->ndo_bpf(netdev, &data);
+}
+
+static void __bpf_map_offload_destroy(struct bpf_offloaded_map *offmap)
+{
+ WARN_ON(bpf_map_offload_ndo(offmap, BPF_OFFLOAD_MAP_FREE));
+ /* Make sure BPF_MAP_GET_NEXT_ID can't find this dead map */
+ bpf_map_free_id(&offmap->map, true);
+ list_del_init(&offmap->offloads);
+ offmap->netdev = NULL;
+}
+
+static void __bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
+ struct net_device *netdev)
+{
+ struct bpf_offload_netdev *ondev, *altdev;
+ struct bpf_offloaded_map *offmap, *mtmp;
+ struct bpf_prog_offload *offload, *ptmp;
+
+ ASSERT_RTNL();
+
+ down_write(&bpf_devs_lock);
+ ondev = rhashtable_lookup_fast(&offdevs, &netdev, offdevs_params);
+ if (WARN_ON(!ondev))
+ goto unlock;
+
+ WARN_ON(rhashtable_remove_fast(&offdevs, &ondev->l, offdevs_params));
+ list_del(&ondev->offdev_netdevs);
+
+ /* Try to move the objects to another netdev of the device */
+ altdev = list_first_entry_or_null(&offdev->netdevs,
+ struct bpf_offload_netdev,
+ offdev_netdevs);
+ if (altdev) {
+ list_for_each_entry(offload, &ondev->progs, offloads)
+ offload->netdev = altdev->netdev;
+ list_splice_init(&ondev->progs, &altdev->progs);
+
+ list_for_each_entry(offmap, &ondev->maps, offloads)
+ offmap->netdev = altdev->netdev;
+ list_splice_init(&ondev->maps, &altdev->maps);
+ } else {
+ list_for_each_entry_safe(offload, ptmp, &ondev->progs, offloads)
+ __bpf_prog_offload_destroy(offload->prog);
+ list_for_each_entry_safe(offmap, mtmp, &ondev->maps, offloads)
+ __bpf_map_offload_destroy(offmap);
+ }
+
+ WARN_ON(!list_empty(&ondev->progs));
+ WARN_ON(!list_empty(&ondev->maps));
+ kfree(ondev);
+unlock:
+ up_write(&bpf_devs_lock);
+}
+
int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr)
{
struct bpf_offload_netdev *ondev;
@@ -206,21 +321,6 @@ bpf_prog_offload_remove_insns(struct bpf_verifier_env *env, u32 off, u32 cnt)
up_read(&bpf_devs_lock);
}

-static void __bpf_prog_offload_destroy(struct bpf_prog *prog)
-{
- struct bpf_prog_offload *offload = prog->aux->offload;
-
- if (offload->dev_state)
- offload->offdev->ops->destroy(prog);
-
- /* Make sure BPF_PROG_GET_NEXT_ID can't find this dead program */
- bpf_prog_free_id(prog, true);
-
- list_del_init(&offload->offloads);
- kfree(offload);
- prog->aux->offload = NULL;
-}
-
void bpf_prog_offload_destroy(struct bpf_prog *prog)
{
down_write(&bpf_devs_lock);
@@ -340,22 +440,6 @@ int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
const struct bpf_prog_ops bpf_offload_prog_ops = {
};

-static int bpf_map_offload_ndo(struct bpf_offloaded_map *offmap,
- enum bpf_netdev_command cmd)
-{
- struct netdev_bpf data = {};
- struct net_device *netdev;
-
- ASSERT_RTNL();
-
- data.command = cmd;
- data.offmap = offmap;
- /* Caller must make sure netdev is valid */
- netdev = offmap->netdev;
-
- return netdev->netdev_ops->ndo_bpf(netdev, &data);
-}
-
struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
{
struct net *net = current->nsproxy->net_ns;
@@ -405,15 +489,6 @@ struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
return ERR_PTR(err);
}

-static void __bpf_map_offload_destroy(struct bpf_offloaded_map *offmap)
-{
- WARN_ON(bpf_map_offload_ndo(offmap, BPF_OFFLOAD_MAP_FREE));
- /* Make sure BPF_MAP_GET_NEXT_ID can't find this dead map */
- bpf_map_free_id(&offmap->map, true);
- list_del_init(&offmap->offloads);
- offmap->netdev = NULL;
-}
-
void bpf_map_offload_map_free(struct bpf_map *map)
{
struct bpf_offloaded_map *offmap = map_to_offmap(map);
@@ -592,77 +667,14 @@ bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map)
int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
struct net_device *netdev)
{
- struct bpf_offload_netdev *ondev;
- int err;
-
- ondev = kzalloc(sizeof(*ondev), GFP_KERNEL);
- if (!ondev)
- return -ENOMEM;
-
- ondev->netdev = netdev;
- ondev->offdev = offdev;
- INIT_LIST_HEAD(&ondev->progs);
- INIT_LIST_HEAD(&ondev->maps);
-
- down_write(&bpf_devs_lock);
- err = rhashtable_insert_fast(&offdevs, &ondev->l, offdevs_params);
- if (err) {
- netdev_warn(netdev, "failed to register for BPF offload\n");
- goto err_unlock_free;
- }
-
- list_add(&ondev->offdev_netdevs, &offdev->netdevs);
- up_write(&bpf_devs_lock);
- return 0;
-
-err_unlock_free:
- up_write(&bpf_devs_lock);
- kfree(ondev);
- return err;
+ return __bpf_offload_dev_netdev_register(offdev, netdev);
}
EXPORT_SYMBOL_GPL(bpf_offload_dev_netdev_register);

void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
struct net_device *netdev)
{
- struct bpf_offload_netdev *ondev, *altdev;
- struct bpf_offloaded_map *offmap, *mtmp;
- struct bpf_prog_offload *offload, *ptmp;
-
- ASSERT_RTNL();
-
- down_write(&bpf_devs_lock);
- ondev = rhashtable_lookup_fast(&offdevs, &netdev, offdevs_params);
- if (WARN_ON(!ondev))
- goto unlock;
-
- WARN_ON(rhashtable_remove_fast(&offdevs, &ondev->l, offdevs_params));
- list_del(&ondev->offdev_netdevs);
-
- /* Try to move the objects to another netdev of the device */
- altdev = list_first_entry_or_null(&offdev->netdevs,
- struct bpf_offload_netdev,
- offdev_netdevs);
- if (altdev) {
- list_for_each_entry(offload, &ondev->progs, offloads)
- offload->netdev = altdev->netdev;
- list_splice_init(&ondev->progs, &altdev->progs);
-
- list_for_each_entry(offmap, &ondev->maps, offloads)
- offmap->netdev = altdev->netdev;
- list_splice_init(&ondev->maps, &altdev->maps);
- } else {
- list_for_each_entry_safe(offload, ptmp, &ondev->progs, offloads)
- __bpf_prog_offload_destroy(offload->prog);
- list_for_each_entry_safe(offmap, mtmp, &ondev->maps, offloads)
- __bpf_map_offload_destroy(offmap);
- }
-
- WARN_ON(!list_empty(&ondev->progs));
- WARN_ON(!list_empty(&ondev->maps));
- kfree(ondev);
-unlock:
- up_write(&bpf_devs_lock);
+ __bpf_offload_dev_netdev_unregister(offdev, netdev);
}
EXPORT_SYMBOL_GPL(bpf_offload_dev_netdev_unregister);

--
2.39.0.314.g84b9a713c41-goog