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From ec72823546e39cd486360f44db16cf47f7e8f59e Mon Sep 17 00:00:00 2001
From: Henning Schild <henning.schild@siemens.com>
Date: Mon, 18 Sep 2017 18:02:08 +0200
Subject: [PATCH] ivshmem-net: fill in and check used descriptor chain len
We are using chains of len==1 make that explicit and expect that from
the remote.
Signed-off-by: Henning Schild <henning.schild@siemens.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
(cherry picked from commit f958c360044184f58605815d428b83fe4329cafd)
---
drivers/net/ivshmem-net.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
--- a/drivers/net/ivshmem-net.c
+++ b/drivers/net/ivshmem-net.c
@@ -335,10 +335,10 @@ static void ivshm_net_tx_clean(struct ne
{
struct ivshm_net *in = netdev_priv(ndev);
struct ivshm_net_queue *tx = &in->tx;
+ struct vring_used_elem *used;
struct vring *vr = &tx->vr;
struct vring_desc *desc;
struct vring_desc *fdesc;
- unsigned int used;
unsigned int num;
u16 used_idx;
u16 last;
@@ -358,13 +358,14 @@ static void ivshm_net_tx_clean(struct ne
u32 len;
u32 tail;
- used = vr->used->ring[last & (vr->num - 1)].id;
- if (used >= vr->num) {
- netdev_err(ndev, "invalid tx used %d\n", used);
+ used = vr->used->ring + (last % vr->num);
+ if (used->id >= vr->num || used->len != 1) {
+ netdev_err(ndev, "invalid tx used->id %d ->len %d\n",
+ used->id, used->len);
break;
}
- desc = &vr->desc[used];
+ desc = &vr->desc[used->id];
data = ivshm_net_desc_data(in, &in->tx, desc, &len);
if (!data) {
@@ -383,7 +384,7 @@ static void ivshm_net_tx_clean(struct ne
else
desc->next = fhead;
- fhead = used;
+ fhead = used->id;
last++;
num++;
}
@@ -433,6 +434,7 @@ static void ivshm_net_rx_finish(struct i
used = rx->last_used_idx++ & (vr->num - 1);
vr->used->ring[used].id = desc_id;
+ vr->used->ring[used].len = 1;
virt_store_release(&vr->used->idx, rx->last_used_idx);
}
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