linux: mvebu: backport mvneta XDP support fixes

This patch backports additional fixes for XDP support in the mvneta driver. These
changes are found upstream as commits:

b37fa92e20ef2 net: mvneta: fix build skb for bm capable devices
f383b2950070c net: mvneta: rely on page_pool_recycle_direct in mvneta_run_xdp
79572c98c554d mvneta driver disallow XDP program on hardware buffer management
44efc78d0e464 net: mvneta: fix XDP support if sw bm is used as fallback

Signed-off-by: Jakov Petrina <jakov.petrina@sartura.hr>

1 files changed, 53 insertions, 0 deletions

diff --git a/target/linux/mvebu/patches-5.4/022-mvneta-driver-disallow-XDP-program-on-hardware-buffe.patch b/target/linux/mvebu/patches-5.4/022-mvneta-driver-disallow-XDP-program-on-hardware-buffe.patch
new file mode 100644
index 0000000000..57ad8b6958
--- /dev/null
+++ b/target/linux/mvebu/patches-5.4/022-mvneta-driver-disallow-XDP-program-on-hardware-buffe.patch
@@ -0,0 +1,53 @@
+From 79572c98c554dcdb080bca547c871a51716dcdf8 Mon Sep 17 00:00:00 2001
+From: Sven Auhagen <sven.auhagen@voleatech.de>
+Date: Sat, 25 Jan 2020 08:07:03 +0000
+Subject: [PATCH] mvneta driver disallow XDP program on hardware buffer
+ management
+
+Recently XDP Support was added to the mvneta driver
+for software buffer management only.
+It is still possible to attach an XDP program if
+hardware buffer management is used.
+It is not doing anything at that point.
+
+The patch disallows attaching XDP programs to mvneta
+if hardware buffer management is used.
+
+I am sorry about that. It is my first submission and I am having
+some troubles with the format of my emails.
+
+v4 -> v5:
+- Remove extra tabs
+
+v3 -> v4:
+- Please ignore v3 I accidentally submitted
+  my other patch with git-send-mail and v4 is correct
+
+v2 -> v3:
+- My mailserver corrupted the patch
+  resubmission with git-send-email
+
+v1 -> v2:
+- Fixing the patches indentation
+
+Signed-off-by: Sven Auhagen <sven.auhagen@voleatech.de>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/ethernet/marvell/mvneta.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+--- a/drivers/net/ethernet/marvell/mvneta.c
++++ b/drivers/net/ethernet/marvell/mvneta.c
+@@ -4231,6 +4231,12 @@ static int mvneta_xdp_setup(struct net_d
+ 		return -EOPNOTSUPP;
+ 	}
+ 
++	if (pp->bm_priv) {
++		NL_SET_ERR_MSG_MOD(extack,
++				   "Hardware Buffer Management not supported on XDP");
++		return -EOPNOTSUPP;
++	}
++
+ 	need_update = !!pp->xdp_prog != !!prog;
+ 	if (running && need_update)
+ 		mvneta_stop(dev);