bpf: offload: add priv field for drivers

Currently bpf_offload_dev does not have any priv pointer, forcing
the drivers to work backwards from the netdev in program metadata.
This is not great given programs are conceptually associated with
the offload device, and it means one or two unnecessary deferences.
Add a priv pointer to bpf_offload_dev.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

1 files changed, 9 insertions, 1 deletions

diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
index 39dba8c90331..ba635209ae9a 100644
--- a/kernel/bpf/offload.c
+++ b/kernel/bpf/offload.c
@@ -35,6 +35,7 @@ static DECLARE_RWSEM(bpf_devs_lock);
 struct bpf_offload_dev {
         const struct bpf_prog_offload_ops *ops;
         struct list_head netdevs;
+        void *priv;
 };
 
 struct bpf_offload_netdev {
@@ -669,7 +670,7 @@ unlock:
 EXPORT_SYMBOL_GPL(bpf_offload_dev_netdev_unregister);
 
 struct bpf_offload_dev *
-bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops)
+bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv)
 {
         struct bpf_offload_dev *offdev;
         int err;
@@ -688,6 +689,7 @@ bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops)
                 return ERR_PTR(-ENOMEM);
 
         offdev->ops = ops;
+        offdev->priv = priv;
         INIT_LIST_HEAD(&offdev->netdevs);
 
         return offdev;
@@ -700,3 +702,9 @@ void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev)
         kfree(offdev);
 }
 EXPORT_SYMBOL_GPL(bpf_offload_dev_destroy);
+
+void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev)
+{
+        return offdev->priv;
+}
+EXPORT_SYMBOL_GPL(bpf_offload_dev_priv);