From: Chi Song <chisong@linux.microsoft.com>
Date: Thu, 23 Jul 2020 21:14:26 -0700
Patch-mainline: v5.9-rc1
Subject: net: hyperv: dump TX indirection table to ethtool regs
Git-commit: 4a062d66b5a532a9da9bdae643e498b035173794
References: jsc#sle-12891
An imbalanced TX indirection table causes netvsc to have low
performance. This table is created and managed during runtime. To help
better diagnose performance issues caused by imbalanced tables, it needs
make TX indirection tables visible.
Because TX indirection table is driver specified information, so
display it via ethtool register dump.
Signed-off-by: Chi Song <chisong@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Olaf Hering <ohering@suse.de>
---
drivers/net/hyperv/netvsc_drv.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -1958,6 +1958,23 @@ syncvf:
return ret;
}
+static int netvsc_get_regs_len(struct net_device *netdev)
+{
+ return VRSS_SEND_TAB_SIZE * sizeof(u32);
+}
+
+static void netvsc_get_regs(struct net_device *netdev,
+ struct ethtool_regs *regs, void *p)
+{
+ struct net_device_context *ndc = netdev_priv(netdev);
+ u32 *regs_buff = p;
+
+ /* increase the version, if buffer format is changed. */
+ regs->version = 1;
+
+ memcpy(regs_buff, ndc->tx_table, VRSS_SEND_TAB_SIZE * sizeof(u32));
+}
+
static u32 netvsc_get_msglevel(struct net_device *ndev)
{
struct net_device_context *ndev_ctx = netdev_priv(ndev);
@@ -1974,6 +1991,8 @@ static void netvsc_set_msglevel(struct net_device *ndev, u32 val)
static const struct ethtool_ops ethtool_ops = {
.get_drvinfo = netvsc_get_drvinfo,
+ .get_regs_len = netvsc_get_regs_len,
+ .get_regs = netvsc_get_regs,
.get_msglevel = netvsc_get_msglevel,
.set_msglevel = netvsc_set_msglevel,
.get_link = ethtool_op_get_link,