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