target/linux/mvebu/patches-5.4/014-mvneta-driver-disallow-XDP-program-on-hardware-buffe.patch

   1 From 79572c98c554dcdb080bca547c871a51716dcdf8 Mon Sep 17 00:00:00 2001
   2 From: Sven Auhagen <sven.auhagen@voleatech.de>
   3 Date: Sat, 25 Jan 2020 08:07:03 +0000
   4 Subject: [PATCH] mvneta driver disallow XDP program on hardware buffer
   5  management
   6
   7 Recently XDP Support was added to the mvneta driver
   8 for software buffer management only.
   9 It is still possible to attach an XDP program if
  10 hardware buffer management is used.
  11 It is not doing anything at that point.
  12
  13 The patch disallows attaching XDP programs to mvneta
  14 if hardware buffer management is used.
  15
  16 I am sorry about that. It is my first submission and I am having
  17 some troubles with the format of my emails.
  18
  19 v4 -> v5:
  20 - Remove extra tabs
  21
  22 v3 -> v4:
  23 - Please ignore v3 I accidentally submitted
  24   my other patch with git-send-mail and v4 is correct
  25
  26 v2 -> v3:
  27 - My mailserver corrupted the patch
  28   resubmission with git-send-email
  29
  30 v1 -> v2:
  31 - Fixing the patches indentation
  32
  33 Signed-off-by: Sven Auhagen <sven.auhagen@voleatech.de>
  34 Signed-off-by: David S. Miller <davem@davemloft.net>
  35 ---
  36  drivers/net/ethernet/marvell/mvneta.c | 6 ++++++
  37  1 file changed, 6 insertions(+)
  38
  39 --- a/drivers/net/ethernet/marvell/mvneta.c
  40 +++ b/drivers/net/ethernet/marvell/mvneta.c
  41 @@ -4263,6 +4263,12 @@ static int mvneta_xdp_setup(struct net_d
  42                 return -EOPNOTSUPP;
  43         }
  44
  45 +       if (pp->bm_priv) {
  46 +               NL_SET_ERR_MSG_MOD(extack,
  47 +                                  "Hardware Buffer Management not supported on XDP");
  48 +               return -EOPNOTSUPP;
  49 +       }
  50 +
  51         need_update = !!pp->xdp_prog != !!prog;
  52         if (running && need_update)
  53                 mvneta_stop(dev);