net: ena: rss: fix failure to get indirection table

[ Upstream commit 0c8923c0a64fb5d14bebb9a9065d2dc25ac5e600 ]

On old hardware, getting / setting the hash function is not supported while
gettting / setting the indirection table is.

This commit enables us to still show the indirection table on older
hardwares by setting the hash function and key to NULL.

Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Sameeh Jubran <sameehj@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/amazon/ena/ena_ethtool.c b/drivers/net/ethernet/amazon/ena/ena_ethtool.c
index 237fbca..dc63aa9 100644 (file)
--- a/drivers/net/ethernet/amazon/ena/ena_ethtool.c
+++ b/drivers/net/ethernet/amazon/ena/ena_ethtool.c
@@ -661,7 +661,21 @@ static int ena_get_rxfh(struct net_device *netdev, u32 *indir, u8 *key,
        if (rc)
                return rc;
 
+       /* We call this function in order to check if the device
+        * supports getting/setting the hash function.
+        */
        rc = ena_com_get_hash_function(adapter->ena_dev, &ena_func, key);
+
+       if (rc) {
+               if (rc == -EOPNOTSUPP) {
+                       key = NULL;
+                       hfunc = NULL;
+                       rc = 0;
+               }
+
+               return rc;
+       }
+
        if (rc)
                return rc;