netdev - [PATCH net-next] net: hv_netvsc: reject RSS hash key programming without RX indirection table

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Message-Id: <1768212093-1594-1-git-send-email-gargaditya@linux.microsoft.com>
Date: Mon, 12 Jan 2026 02:01:33 -0800
From: Aditya Garg <gargaditya@...ux.microsoft.com>
To: kys@...rosoft.com,
	haiyangz@...rosoft.com,
	wei.liu@...nel.org,
	decui@...rosoft.com,
	longli@...rosoft.com,
	andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	stephen@...workplumber.org,
	linux-hyperv@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	dipayanroy@...ux.microsoft.com,
	ssengar@...ux.microsoft.com,
	shradhagupta@...ux.microsoft.com,
	ernis@...ux.microsoft.com,
	gargaditya@...rosoft.com,
	gargaditya@...ux.microsoft.com
Subject: [PATCH net-next] net: hv_netvsc: reject RSS hash key programming without RX indirection table

RSS configuration requires a valid RX indirection table. When the device
reports a single receive queue, rndis_filter_device_add() does not
allocate an indirection table, accepting RSS hash key updates in this
state leads to a hang.

Fix this by gating netvsc_set_rxfh() on ndc->rx_table_sz and return
-EOPNOTSUPP when the table is absent. This aligns set_rxfh with the device
capabilities and prevents incorrect behavior.

Fixes: 962f3fee83a4 ("netvsc: add ethtool ops to get/set RSS key")
Signed-off-by: Aditya Garg <gargaditya@...ux.microsoft.com>
Reviewed-by: Dipayaan Roy <dipayanroy@...ux.microsoft.com>
---
 drivers/net/hyperv/netvsc_drv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 3d47d749ef9f..cbd52cb79268 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -1750,6 +1750,9 @@ static int netvsc_set_rxfh(struct net_device *dev,
 	    rxfh->hfunc != ETH_RSS_HASH_TOP)
 		return -EOPNOTSUPP;
 
+	if (!ndc->rx_table_sz)
+		return -EOPNOTSUPP;
+
 	rndis_dev = ndev->extension;
 	if (rxfh->indir) {
 		for (i = 0; i < ndc->rx_table_sz; i++)
-- 
2.43.0