From: Shannon Nelson <snelson@pensando.io>
Date: Tue, 7 Jul 2020 14:13:26 -0700
Subject: ionic: centralize queue reset code
Patch-mainline: v5.8-rc5
Git-commit: 086c18f2452d0028f81e319f098bcb8e53133dbf
References: bsc#1167773

The queue reset pattern is used in a couple different places,
only slightly different from each other, and could cause
issues if one gets changed and the other didn't.  This puts
them together so that only one version is needed, yet each
can have slighty different effects by passing in a pointer
to a work function to do whatever configuration twiddling is
needed in the middle of the reset.

This specifically addresses issues seen where under loops
of changing ring size or queue count parameters we could
occasionally bump into the netdev watchdog.

v2: added more commit message commentary

Fixes: 4d03e00a2140 ("ionic: Add initial ethtool support")
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/pensando/ionic/ionic_ethtool.c |   52 ++++++--------------
 drivers/net/ethernet/pensando/ionic/ionic_lif.c     |   17 ++++--
 drivers/net/ethernet/pensando/ionic/ionic_lif.h     |    4 +
 3 files changed, 32 insertions(+), 41 deletions(-)

--- a/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
@@ -469,12 +469,18 @@ static void ionic_get_ringparam(struct n
 	ring->rx_pending = lif->nrxq_descs;
 }
 
+static void ionic_set_ringsize(struct ionic_lif *lif, void *arg)
+{
+	struct ethtool_ringparam *ring = arg;
+
+	lif->ntxq_descs = ring->tx_pending;
+	lif->nrxq_descs = ring->rx_pending;
+}
+
 static int ionic_set_ringparam(struct net_device *netdev,
 			       struct ethtool_ringparam *ring)
 {
 	struct ionic_lif *lif = netdev_priv(netdev);
-	bool running;
-	int err;
 
 	if (ring->rx_mini_pending || ring->rx_jumbo_pending) {
 		netdev_info(netdev, "Changing jumbo or mini descriptors not supported\n");
@@ -492,22 +498,7 @@ static int ionic_set_ringparam(struct ne
 	    ring->rx_pending == lif->nrxq_descs)
 		return 0;
 
-	err = ionic_wait_for_bit(lif, IONIC_LIF_F_QUEUE_RESET);
-	if (err)
-		return err;
-
-	running = test_bit(IONIC_LIF_F_UP, lif->state);
-	if (running)
-		ionic_stop(netdev);
-
-	lif->ntxq_descs = ring->tx_pending;
-	lif->nrxq_descs = ring->rx_pending;
-
-	if (running)
-		ionic_open(netdev);
-	clear_bit(IONIC_LIF_F_QUEUE_RESET, lif->state);
-
-	return 0;
+	return ionic_reset_queues(lif, ionic_set_ringsize, ring);
 }
 
 static void ionic_get_channels(struct net_device *netdev,
@@ -522,12 +513,17 @@ static void ionic_get_channels(struct ne
 	ch->combined_count = lif->nxqs;
 }
 
+static void ionic_set_queuecount(struct ionic_lif *lif, void *arg)
+{
+	struct ethtool_channels *ch = arg;
+
+	lif->nxqs = ch->combined_count;
+}
+
 static int ionic_set_channels(struct net_device *netdev,
 			      struct ethtool_channels *ch)
 {
 	struct ionic_lif *lif = netdev_priv(netdev);
-	bool running;
-	int err;
 
 	if (!ch->combined_count || ch->other_count ||
 	    ch->rx_count || ch->tx_count)
@@ -536,21 +532,7 @@ static int ionic_set_channels(struct net
 	if (ch->combined_count == lif->nxqs)
 		return 0;
 
-	err = ionic_wait_for_bit(lif, IONIC_LIF_F_QUEUE_RESET);
-	if (err)
-		return err;
-
-	running = test_bit(IONIC_LIF_F_UP, lif->state);
-	if (running)
-		ionic_stop(netdev);
-
-	lif->nxqs = ch->combined_count;
-
-	if (running)
-		ionic_open(netdev);
-	clear_bit(IONIC_LIF_F_QUEUE_RESET, lif->state);
-
-	return 0;
+	return ionic_reset_queues(lif, ionic_set_queuecount, ch);
 }
 
 static u32 ionic_get_priv_flags(struct net_device *netdev)
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -1313,7 +1313,7 @@ static int ionic_change_mtu(struct net_d
 		return err;
 
 	netdev->mtu = new_mtu;
-	err = ionic_reset_queues(lif);
+	err = ionic_reset_queues(lif, NULL, NULL);
 
 	return err;
 }
@@ -1325,7 +1325,7 @@ static void ionic_tx_timeout_work(struct
 	netdev_info(lif->netdev, "Tx Timeout recovery\n");
 
 	rtnl_lock();
-	ionic_reset_queues(lif);
+	ionic_reset_queues(lif, NULL, NULL);
 	rtnl_unlock();
 }
 
@@ -1988,7 +1988,7 @@ static const struct net_device_ops ionic
 	.ndo_get_vf_stats       = ionic_get_vf_stats,
 };
 
-int ionic_reset_queues(struct ionic_lif *lif)
+int ionic_reset_queues(struct ionic_lif *lif, ionic_reset_cb cb, void *arg)
 {
 	bool running;
 	int err = 0;
@@ -2001,12 +2001,19 @@ int ionic_reset_queues(struct ionic_lif
 	if (running) {
 		netif_device_detach(lif->netdev);
 		err = ionic_stop(lif->netdev);
+		if (err)
+			goto reset_out;
 	}
-	if (!err && running) {
-		ionic_open(lif->netdev);
+
+	if (cb)
+		cb(lif, arg);
+
+	if (running) {
+		err = ionic_open(lif->netdev);
 		netif_device_attach(lif->netdev);
 	}
 
+reset_out:
 	clear_bit(IONIC_LIF_F_QUEUE_RESET, lif->state);
 
 	return err;
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
@@ -248,6 +248,8 @@ static inline u32 ionic_coal_hw_to_usec(
 	return (units * div) / mult;
 }
 
+typedef void (*ionic_reset_cb)(struct ionic_lif *lif, void *arg);
+
 void ionic_link_status_check_request(struct ionic_lif *lif);
 void ionic_get_stats64(struct net_device *netdev,
 		       struct rtnl_link_stats64 *ns);
@@ -267,7 +269,7 @@ int ionic_lif_rss_config(struct ionic_li
 
 int ionic_open(struct net_device *netdev);
 int ionic_stop(struct net_device *netdev);
-int ionic_reset_queues(struct ionic_lif *lif);
+int ionic_reset_queues(struct ionic_lif *lif, ionic_reset_cb cb, void *arg);
 
 static inline void debug_stats_txq_post(struct ionic_qcq *qcq,
 					struct ionic_txq_desc *desc, bool dbell)