From: David Arinzon <darinzon@amazon.com>
Date: Thu, 29 Dec 2022 07:30:09 +0000
Subject: net: ena: Fix rx_copybreak value update
Patch-mainline: v6.2-rc3
Git-commit: c7062aaee099f2f43d6f07a71744b44b94b94b34
References: git-fixes

Make the upper bound on rx_copybreak tighter, by
making sure it is smaller than the minimum of mtu and
ENA_PAGE_SIZE. With the current upper bound of mtu,
rx_copybreak can be larger than a page. Such large
rx_copybreak will not bring any performance benefit to
the user and therefore makes no sense.

In addition, the value update was only reflected in
the adapter structure, but not applied for each ring,
causing it to not take effect.

Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Osama Abboud <osamaabb@amazon.com>
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: David Arinzon <darinzon@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/amazon/ena/ena_ethtool.c |    6 +-----
 drivers/net/ethernet/amazon/ena/ena_netdev.c  |   18 ++++++++++++++++++
 drivers/net/ethernet/amazon/ena/ena_netdev.h  |    2 ++
 3 files changed, 21 insertions(+), 5 deletions(-)

--- a/drivers/net/ethernet/amazon/ena/ena_ethtool.c
+++ b/drivers/net/ethernet/amazon/ena/ena_ethtool.c
@@ -880,11 +880,7 @@ static int ena_set_tunable(struct net_de
 	switch (tuna->id) {
 	case ETHTOOL_RX_COPYBREAK:
 		len = *(u32 *)data;
-		if (len > adapter->netdev->mtu) {
-			ret = -EINVAL;
-			break;
-		}
-		adapter->rx_copybreak = len;
+		ret = ena_set_rx_copybreak(adapter, len);
 		break;
 	default:
 		ret = -EINVAL;
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -2829,6 +2829,24 @@ int ena_update_queue_sizes(struct ena_ad
 	return dev_was_up ? ena_up(adapter) : 0;
 }
 
+int ena_set_rx_copybreak(struct ena_adapter *adapter, u32 rx_copybreak)
+{
+	struct ena_ring *rx_ring;
+	int i;
+
+	if (rx_copybreak > min_t(u16, adapter->netdev->mtu, ENA_PAGE_SIZE))
+		return -EINVAL;
+
+	adapter->rx_copybreak = rx_copybreak;
+
+	for (i = 0; i < adapter->num_io_queues; i++) {
+		rx_ring = &adapter->rx_ring[i];
+		rx_ring->rx_copybreak = rx_copybreak;
+	}
+
+	return 0;
+}
+
 int ena_update_queue_count(struct ena_adapter *adapter, u32 new_channel_count)
 {
 	struct ena_com_dev *ena_dev = adapter->ena_dev;
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.h
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.h
@@ -404,6 +404,8 @@ int ena_update_queue_sizes(struct ena_ad
 
 int ena_update_queue_count(struct ena_adapter *adapter, u32 new_channel_count);
 
+int ena_set_rx_copybreak(struct ena_adapter *adapter, u32 rx_copybreak);
+
 int ena_get_sset_count(struct net_device *netdev, int sset);
 
 enum ena_xdp_errors_t {