netdev - [PATCH v7 net-next] net: hyperv: dump TX indirection table to ethtool regs

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Message-ID: <alpine.LRH.2.23.451.2007222356070.2641@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.inter>
Date:   Wed, 22 Jul 2020 23:59:09 -0700 (PDT)
From:   Chi Song <chisong@...rosoft.com>
To:     "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
cc:     linux-hyperv@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v7 net-next] net: hyperv: dump TX indirection table to ethtool
 regs

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@...rosoft.com>
---
v7: move to ethtool register dump
v6: update names to be more precise, remove useless assignment
v5: update variable orders
v4: use a separated group to organize tx_indirection better, change
 location of attributes init/exit to netvsc_drv_init/exit

 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
index 6267f706e8ee..3288221726ea 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -1934,6 +1934,23 @@ static int netvsc_set_features(struct net_device
*ndev,
 	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);
@@ -1950,6 +1967,8 @@ 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,
-- 
2.25.1