From: Jakub Kicinski <jakub.kicinski@netronome.com>
Date: Wed, 21 Jun 2017 18:25:05 -0700
Subject: nfp: xdp: move driver XDP setup into a separate function
Patch-mainline: v4.13-rc1
Git-commit: c443b5accedaef8e1d6faf7a1bb921670a90a3d0
References: bsc#1055968

In preparation of XDP offload flags move the driver setup into
a function.  Otherwise the number of conditions in one function
would make it slightly hard to follow.  The offload handler may
now be called with NULL prog, even if no offload is currently
active, but that's fine, offload code can handle that.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/netronome/nfp/nfp_net_common.c |   23 +++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -3273,10 +3273,11 @@ static void nfp_net_del_vxlan_port(struc
 		nfp_net_set_vxlan_port(nn, idx, 0);
 }
 
-static int nfp_net_xdp_setup(struct nfp_net *nn, struct netdev_xdp *xdp)
+static int
+nfp_net_xdp_setup_drv(struct nfp_net *nn, struct bpf_prog *prog,
+		      struct netlink_ext_ack *extack)
 {
 	struct bpf_prog *old_prog = nn->dp.xdp_prog;
-	struct bpf_prog *prog = xdp->prog;
 	struct nfp_net_dp *dp;
 	int err;
 
@@ -3285,7 +3286,6 @@ static int nfp_net_xdp_setup(struct nfp_
 	if (prog && nn->dp.xdp_prog) {
 		prog = xchg(&nn->dp.xdp_prog, prog);
 		bpf_prog_put(prog);
-		nfp_app_xdp_offload(nn->app, nn, nn->dp.xdp_prog);
 		return 0;
 	}
 
@@ -3299,13 +3299,26 @@ static int nfp_net_xdp_setup(struct nfp_
 	dp->rx_dma_off = prog ? XDP_PACKET_HEADROOM - nn->dp.rx_offset : 0;
 
 	/* We need RX reconfig to remap the buffers (BIDIR vs FROM_DEV) */
-	err = nfp_net_ring_reconfig(nn, dp, xdp->extack);
+	err = nfp_net_ring_reconfig(nn, dp, extack);
 	if (err)
 		return err;
 
 	if (old_prog)
 		bpf_prog_put(old_prog);
 
+	return 0;
+}
+
+static int
+nfp_net_xdp_setup(struct nfp_net *nn, struct bpf_prog *prog,
+		  struct netlink_ext_ack *extack)
+{
+	int err;
+
+	err = nfp_net_xdp_setup_drv(nn, prog, extack);
+	if (err)
+		return err;
+
 	nfp_app_xdp_offload(nn->app, nn, nn->dp.xdp_prog);
 
 	return 0;
@@ -3317,7 +3330,7 @@ static int nfp_net_xdp(struct net_device
 
 	switch (xdp->command) {
 	case XDP_SETUP_PROG:
-		return nfp_net_xdp_setup(nn, xdp);
+		return nfp_net_xdp_setup(nn, xdp->prog, xdp->extack);
 	case XDP_QUERY_PROG:
 		xdp->prog_attached = !!nn->dp.xdp_prog;
 		xdp->prog_id = nn->dp.xdp_prog ? nn->dp.xdp_prog->aux->id : 0;