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