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