net: add ndo to setup/query xdp prog in adapter rx

[cascardo/linux.git] / net / core / dev.c

diff --git a/net/core/dev.c b/net/core/dev.c
index 7894e40..2a9c39f 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -94,6 +94,7 @@
 #include <linux/ethtool.h>
 #include <linux/notifier.h>
 #include <linux/skbuff.h>
+#include <linux/bpf.h>
 #include <net/net_namespace.h>
 #include <net/sock.h>
 #include <net/busy_poll.h>
@@ -6614,6 +6615,38 @@ int dev_change_proto_down(struct net_device *dev, bool proto_down)
 }
 EXPORT_SYMBOL(dev_change_proto_down);
 
+/**
+ *     dev_change_xdp_fd - set or clear a bpf program for a device rx path
+ *     @dev: device
+ *     @fd: new program fd or negative value to clear
+ *
+ *     Set or clear a bpf program for a device
+ */
+int dev_change_xdp_fd(struct net_device *dev, int fd)
+{
+       const struct net_device_ops *ops = dev->netdev_ops;
+       struct bpf_prog *prog = NULL;
+       struct netdev_xdp xdp = {};
+       int err;
+
+       if (!ops->ndo_xdp)
+               return -EOPNOTSUPP;
+       if (fd >= 0) {
+               prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_XDP);
+               if (IS_ERR(prog))
+                       return PTR_ERR(prog);
+       }
+
+       xdp.command = XDP_SETUP_PROG;
+       xdp.prog = prog;
+       err = ops->ndo_xdp(dev, &xdp);
+       if (err < 0 && prog)
+               bpf_prog_put(prog);
+
+       return err;
+}
+EXPORT_SYMBOL(dev_change_xdp_fd);
+
 /**
  *     dev_new_index   -       allocate an ifindex
  *     @net: the applicable net namespace