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Subject[PATCH 4.19 020/142] net: restore call to netdev_queue_numa_node_write when resetting XPS
Date
4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sabrina Dubroca <sd@queasysnail.net>

[ Upstream commit f28c020fb488e1a8b87469812017044bef88aa2b ]

Before commit 80d19669ecd3 ("net: Refactor XPS for CPUs and Rx queues"),
netif_reset_xps_queues() did netdev_queue_numa_node_write() for all the
queues being reset. Now, this is only done when the "active" variable in
clean_xps_maps() is false, ie when on all the CPUs, there's no active
XPS mapping left.

Fixes: 80d19669ecd3 ("net: Refactor XPS for CPUs and Rx queues")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/core/dev.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)

--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2173,17 +2173,19 @@ static void clean_xps_maps(struct net_de
active |= remove_xps_queue_cpu(dev, dev_maps, j, offset,
count);
if (!active) {
- if (is_rxqs_map) {
+ if (is_rxqs_map)
RCU_INIT_POINTER(dev->xps_rxqs_map, NULL);
- } else {
+ else
RCU_INIT_POINTER(dev->xps_cpus_map, NULL);
+ kfree_rcu(dev_maps, rcu);
+ }

- for (i = offset + (count - 1); count--; i--)
- netdev_queue_numa_node_write(
- netdev_get_tx_queue(dev, i),
- NUMA_NO_NODE);
+ if (!is_rxqs_map) {
+ for (i = offset + (count - 1); count--; i--) {
+ netdev_queue_numa_node_write(
+ netdev_get_tx_queue(dev, i),
+ NUMA_NO_NODE);
}
- kfree_rcu(dev_maps, rcu);
}
}


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