target/linux/layerscape/patches-5.4/809-jailhouse-0014-ivshmem-net-set-and-check-descriptor-flags.patch

   1 From 3661172f5786a3d2ebe1d2244f1f08a95e1cfd09 Mon Sep 17 00:00:00 2001
   2 From: Henning Schild <henning.schild@siemens.com>
   3 Date: Mon, 18 Sep 2017 18:02:11 +0200
   4 Subject: [PATCH] ivshmem-net: set and check descriptor flags
   5
   6 We do not support the use of any flags. Make sure the remote does not
   7 confuse us using flags.
   8
   9 Signed-off-by: Henning Schild <henning.schild@siemens.com>
  10 [Jan: Remove wrong removal of next field initialization]
  11 Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
  12 (cherry picked from commit 986d58d84245e023a1a66ab6495b354b6b8cd2f0)
  13 ---
  14  drivers/net/ivshmem-net.c | 5 +++++
  15  1 file changed, 5 insertions(+)
  16
  17 --- a/drivers/net/ivshmem-net.c
  18 +++ b/drivers/net/ivshmem-net.c
  19 @@ -123,8 +123,12 @@ static void *ivshm_net_desc_data(struct
  20  {
  21         u64 offs = READ_ONCE(desc->addr);
  22         u32 dlen = READ_ONCE(desc->len);
  23 +       u16 flags = READ_ONCE(desc->flags);
  24         void *data;
  25
  26 +       if (flags)
  27 +               return NULL;
  28 +
  29         if (offs >= in->shmlen)
  30                 return NULL;
  31
  32 @@ -317,6 +321,7 @@ static int ivshm_net_tx_frame(struct net
  33
  34         desc->addr = buf - in->shm;
  35         desc->len = skb->len;
  36 +       desc->flags = 0;
  37
  38         avail = tx->last_avail_idx++ & (vr->num - 1);
  39         vr->avail->ring[avail] = desc_idx;