[PATCH 0/1] Add software timestamp capabilities to xen-netback device

[PATCH 0/1] Add software timestamp capabilities to xen-netback device

[Luca Fancellu]

Hi all,

during some experiment using PTP (ptp4l) between a Dom0 domain and a DomU guest,
I noticed that the virtual interface brought up by the toolstack was not able
to be used as ptp4l interface on the Dom0 side, a brief investigation on the
drivers revealed that the backend driver doesn't have the SW timestamp
capabilities, so in order to provide them, I'm sending this patch.

Luca Fancellu (1):
  xen-netback: add software timestamp capabilities

 drivers/net/xen-netback/interface.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)


base-commit: cb0856346a60fe3eb837ba5e73588a41f81ac05f
-- 
2.34.1

[PATCH 1/1] xen-netback: add software timestamp capabilities

[Luca Fancellu]

Add software timestamp capabilities to the xen-netback driver
by advertising it on the struct ethtool_ops and calling
skb_tx_timestamp before passing the buffer to the queue.

Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
---
 drivers/net/xen-netback/interface.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index f3f2c07423a6..b71158967123 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -254,6 +254,9 @@ xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE)
 		skb_clear_hash(skb);
 
+	/* timestamp packet in software */
+	skb_tx_timestamp(skb);
+
 	if (!xenvif_rx_queue_tail(queue, skb))
 		goto drop;
 
@@ -460,7 +463,7 @@ static void xenvif_get_strings(struct net_device *dev, u32 stringset, u8 * data)
 
 static const struct ethtool_ops xenvif_ethtool_ops = {
 	.get_link	= ethtool_op_get_link,
-
+	.get_ts_info 	= ethtool_op_get_ts_info,
 	.get_sset_count = xenvif_get_sset_count,
 	.get_ethtool_stats = xenvif_get_ethtool_stats,
 	.get_strings = xenvif_get_strings,
-- 
2.34.1

Re: [PATCH 0/1] Add software timestamp capabilities to xen-netback device

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (main)
by David S. Miller <davem@davemloft.net>:

On Tue, 10 Oct 2023 15:26:29 +0100 you wrote:
> Hi all,
> 
> during some experiment using PTP (ptp4l) between a Dom0 domain and a DomU guest,
> I noticed that the virtual interface brought up by the toolstack was not able
> to be used as ptp4l interface on the Dom0 side, a brief investigation on the
> drivers revealed that the backend driver doesn't have the SW timestamp
> capabilities, so in order to provide them, I'm sending this patch.
> 
> [...]

Here is the summary with links:
  - [1/1] xen-netback: add software timestamp capabilities
    https://git.kernel.org/netdev/net-next/c/0b38d2ec2282

You are awesome, thank you!
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