[PATCH net-next 6/8] nfp: bpf: add support for XDP_FLAGS_HW_MODE

[Jakub Kicinski]

Respect the XDP_FLAGS_HW_MODE.  When it's set install the program
on the NIC and skip enabling XDP in the driver.

Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c 
b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 35b4530a7e02..c9fc1df1823e 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -3302,19 +3302,25 @@ static int
 nfp_net_xdp_setup(struct nfp_net *nn, struct bpf_prog *prog, u32 flags,
                  struct netlink_ext_ack *extack)
 {
-       struct bpf_prog *offload_prog;
+       struct bpf_prog *drv_prog, *offload_prog;
        int err;
 
        if (nn->xdp_prog && (flags ^ nn->xdp_flags) & XDP_FLAGS_MODES)
                return -EBUSY;
 
+       /* Load both when no flags set to allow easy activation of driver path
+        * when program is replaced by one which can't be offloaded.
+        */
+       drv_prog     = flags & XDP_FLAGS_HW_MODE  ? NULL : prog;
        offload_prog = flags & XDP_FLAGS_DRV_MODE ? NULL : prog;
 
-       err = nfp_net_xdp_setup_drv(nn, prog, extack);
+       err = nfp_net_xdp_setup_drv(nn, drv_prog, extack);
        if (err)
                return err;
 
-       nfp_app_xdp_offload(nn->app, nn, offload_prog);
+       err = nfp_app_xdp_offload(nn->app, nn, offload_prog);
+       if (err && flags & XDP_FLAGS_HW_MODE)
+               return err;
 
        if (nn->xdp_prog)
                bpf_prog_put(nn->xdp_prog);
@@ -3330,6 +3336,7 @@ static int nfp_net_xdp(struct net_device *netdev, struct 
netdev_xdp *xdp)
 
        switch (xdp->command) {
        case XDP_SETUP_PROG:
+       case XDP_SETUP_PROG_HW:
                return nfp_net_xdp_setup(nn, xdp->prog, xdp->flags,
                                         xdp->extack);
        case XDP_QUERY_PROG:
-- 
2.11.0