This is a note to let you know that I've just added the patch titled
xen-netback: use default TX queue size for vifs
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xen-netback-use-default-tx-queue-size-for-vifs.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 3c3a9debea4b25ab1eecf9a467140f2c70225115
Author: Roger Pau Monne <roger.pau@xxxxxxxxxx>
Date: Thu Oct 5 16:08:31 2023 +0200
xen-netback: use default TX queue size for vifs
[ Upstream commit 66cf7435a26917c0c4d6245ad9137e7606e84fdf ]
Do not set netback interfaces (vifs) default TX queue size to the ring size.
The TX queue size is not related to the ring size, and using the ring size (32)
as the queue size can lead to packet drops. Note the TX side of the vif
interface in the netback domain is the one receiving packets to be injected
to the guest.
Do not explicitly set the TX queue length to any value when creating the
interface, and instead use the system default. Note that the queue length can
also be adjusted at runtime.
Fixes: f942dc2552b8 ('xen network backend driver')
Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Reviewed-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
Acked-by: Wei Liu <wei.liu@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index 255432e75d48d..077b23ff50f95 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -41,8 +41,6 @@
#include <asm/xen/hypercall.h>
#include <xen/balloon.h>
-#define XENVIF_QUEUE_LENGTH 32
-
/* Number of bytes allowed on the internal guest Rx queue. */
#define XENVIF_RX_QUEUE_BYTES (XEN_NETIF_RX_RING_SIZE/2 * PAGE_SIZE)
@@ -527,8 +525,6 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
dev->features = dev->hw_features | NETIF_F_RXCSUM;
dev->ethtool_ops = &xenvif_ethtool_ops;
- dev->tx_queue_len = XENVIF_QUEUE_LENGTH;
-
dev->min_mtu = ETH_MIN_MTU;
dev->max_mtu = ETH_MAX_MTU - VLAN_ETH_HLEN;
