[RFC net-next 1/8] xdp: pass XDP flags into install handlers

[Jakub Kicinski]

Pass XDP flags to the xdp ndo.  This will allow drivers to look
at the mode flags and make decisions about offload.

Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com>
---
 include/linux/netdevice.h | 1 +
 net/core/dev.c            | 5 +++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 7c7118b3bd69..b194817631de 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -820,6 +820,7 @@ struct netdev_xdp {
        union {
                /* XDP_SETUP_PROG */
                struct {
+                       u32 flags;
                        struct bpf_prog *prog;
                        struct netlink_ext_ack *extack;
                };
diff --git a/net/core/dev.c b/net/core/dev.c
index b8d6dd9e8b5c..a04db264aa1c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6953,7 +6953,7 @@ bool __dev_xdp_attached(struct net_device *dev, xdp_op_t 
xdp_op,
 }
 
 static int dev_xdp_install(struct net_device *dev, xdp_op_t xdp_op,
-                          struct netlink_ext_ack *extack,
+                          struct netlink_ext_ack *extack, u32 flags,
                           struct bpf_prog *prog)
 {
        struct netdev_xdp xdp;
@@ -6961,6 +6961,7 @@ static int dev_xdp_install(struct net_device *dev, 
xdp_op_t xdp_op,
        memset(&xdp, 0, sizeof(xdp));
        xdp.command = XDP_SETUP_PROG;
        xdp.extack = extack;
+       xdp.flags = flags;
        xdp.prog = prog;
 
        return xdp_op(dev, &xdp);
@@ -7005,7 +7006,7 @@ int dev_change_xdp_fd(struct net_device *dev, struct 
netlink_ext_ack *extack,
                        return PTR_ERR(prog);
        }
 
-       err = dev_xdp_install(dev, xdp_op, extack, prog);
+       err = dev_xdp_install(dev, xdp_op, extack, flags, prog);
        if (err < 0 && prog)
                bpf_prog_put(prog);
 
-- 
2.11.0