* [PATCH net] ibmvnic: add memory barrier to protect long term buffer
@ 2021-02-13 2:48 Lijun Pan
2021-02-15 23:20 ` patchwork-bot+netdevbpf
0 siblings, 1 reply; 2+ messages in thread
From: Lijun Pan @ 2021-02-13 2:48 UTC (permalink / raw)
To: netdev; +Cc: sukadev, drt, Lijun Pan, Thomas Falcon
dma_rmb() barrier is added to load the long term buffer before copying
it to socket buffer; and dma_wmb() barrier is added to update the
long term buffer before it being accessed by VIOS (virtual i/o server).
Fixes: 032c5e82847a ("Driver for IBM System i/p VNIC protocol")
Signed-off-by: Lijun Pan <ljp@linux.ibm.com>
Acked-by: Thomas Falcon <tlfalcon@linux.ibm.com>
---
drivers/net/ethernet/ibm/ibmvnic.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index c8b0d99608d5..cd201f89ce6c 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -1705,6 +1705,9 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
skb_copy_from_linear_data(skb, dst, skb->len);
}
+ /* post changes to long_term_buff *dst before VIOS accessing it */
+ dma_wmb();
+
tx_pool->consumer_index =
(tx_pool->consumer_index + 1) % tx_pool->num_buffers;
@@ -2544,6 +2547,8 @@ static int ibmvnic_poll(struct napi_struct *napi, int budget)
offset = be16_to_cpu(next->rx_comp.off_frame_data);
flags = next->rx_comp.flags;
skb = rx_buff->skb;
+ /* load long_term_buff before copying to skb */
+ dma_rmb();
skb_copy_to_linear_data(skb, rx_buff->data + offset,
length);
--
2.23.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH net] ibmvnic: add memory barrier to protect long term buffer
2021-02-13 2:48 [PATCH net] ibmvnic: add memory barrier to protect long term buffer Lijun Pan
@ 2021-02-15 23:20 ` patchwork-bot+netdevbpf
0 siblings, 0 replies; 2+ messages in thread
From: patchwork-bot+netdevbpf @ 2021-02-15 23:20 UTC (permalink / raw)
To: Lijun Pan; +Cc: netdev, sukadev, drt, tlfalcon
Hello:
This patch was applied to netdev/net.git (refs/heads/master):
On Fri, 12 Feb 2021 20:48:40 -0600 you wrote:
> dma_rmb() barrier is added to load the long term buffer before copying
> it to socket buffer; and dma_wmb() barrier is added to update the
> long term buffer before it being accessed by VIOS (virtual i/o server).
>
> Fixes: 032c5e82847a ("Driver for IBM System i/p VNIC protocol")
> Signed-off-by: Lijun Pan <ljp@linux.ibm.com>
> Acked-by: Thomas Falcon <tlfalcon@linux.ibm.com>
>
> [...]
Here is the summary with links:
- [net] ibmvnic: add memory barrier to protect long term buffer
https://git.kernel.org/netdev/net/c/42557dab78ed
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2021-02-15 23:21 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-02-13 2:48 [PATCH net] ibmvnic: add memory barrier to protect long term buffer Lijun Pan
2021-02-15 23:20 ` patchwork-bot+netdevbpf
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).