linux-kernel - [PATCH net-next] net: mana: Allow setting the number of queues while the NIC is down

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Date:   Mon, 25 Oct 2021 11:37:34 -0700
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     linux-hyperv@...r.kernel.org, netdev@...r.kernel.org
Cc:     haiyangz@...rosoft.com, kys@...rosoft.com, sthemmin@...rosoft.com,
        paulros@...rosoft.com, shacharr@...rosoft.com, olaf@...fle.de,
        vkuznets@...hat.com, davem@...emloft.net,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next] net: mana: Allow setting the number of queues while the NIC is down

The existing code doesn't allow setting the number of queues while the
NIC is down.

Update the ethtool handler functions to support setting the number of
queues while the NIC is at down state.

Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
 drivers/net/ethernet/microsoft/mana/mana_en.c | 19 +++++++++----------
 .../ethernet/microsoft/mana/mana_ethtool.c    |  3 ---
 2 files changed, 9 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index d65697c239c8..ef95f4017c6d 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -1667,24 +1667,23 @@ int mana_attach(struct net_device *ndev)
 	if (err)
 		return err;
 
-	err = mana_alloc_queues(ndev);
-	if (err) {
-		kfree(apc->rxqs);
-		apc->rxqs = NULL;
-		return err;
+	if (apc->port_st_save) {
+		err = mana_alloc_queues(ndev);
+		if (err) {
+			mana_cleanup_port_context(apc);
+			return err;
+		}
 	}
 
-	netif_device_attach(ndev);
-
 	apc->port_is_up = apc->port_st_save;
 
 	/* Ensure port state updated before txq state */
 	smp_wmb();
 
-	if (apc->port_is_up) {
+	if (apc->port_is_up)
 		netif_carrier_on(ndev);
-		netif_tx_wake_all_queues(ndev);
-	}
+
+	netif_device_attach(ndev);
 
 	return 0;
 }
diff --git a/drivers/net/ethernet/microsoft/mana/mana_ethtool.c b/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
index 7e74339f39ae..c3c81ae3fafd 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
@@ -211,9 +211,6 @@ static int mana_set_channels(struct net_device *ndev,
 	unsigned int old_count = apc->num_queues;
 	int err, err2;
 
-	if (!apc->port_is_up)
-		return -EOPNOTSUPP;
-
 	err = mana_detach(ndev, false);
 	if (err) {
 		netdev_err(ndev, "mana_detach failed: %d\n", err);
-- 
2.25.1