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net: ena: make ena rxfh support ETH_RSS_HASH_NO_CHANGE 

commit 470793a78c upstream.

As the name suggests ETH_RSS_HASH_NO_CHANGE is received upon changing
the key or indirection table using ethtool while keeping the same hash
function.

Also add a function for retrieving the current hash function from
the ena-com layer.

Fixes: 1738cd3ed3 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Sameeh Jubran <sameehj@amazon.com>
Signed-off-by: Saeed Bshara <saeedb@amazon.com>
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Arthur Kiyanovski 2020-02-11 15:17:49 +00:00 committed by Greg Kroah-Hartman
parent 2170960863
commit 483724e27e
3 changed files with 16 additions and 0 deletions
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5
drivers/net/ethernet/amazon/ena/ena_com.c
View File

@ -1059,6 +1059,11 @@ static void ena_com_hash_key_fill_default_key(struct ena_com_dev *ena_dev)
hash_key->keys_num = sizeof(hash_key->key) / sizeof(u32);
}
int ena_com_get_current_hash_function(struct ena_com_dev *ena_dev)
{
return ena_dev->rss.hash_func;
}
static int ena_com_hash_key_allocate(struct ena_com_dev *ena_dev)
{
struct ena_rss *rss = &ena_dev->rss;

8
drivers/net/ethernet/amazon/ena/ena_com.h
View File

@ -656,6 +656,14 @@ int ena_com_rss_init(struct ena_com_dev *ena_dev, u16 log_size);
*/
void ena_com_rss_destroy(struct ena_com_dev *ena_dev);
/* ena_com_get_current_hash_function - Get RSS hash function
* @ena_dev: ENA communication layer struct
*
* Return the current hash function.
* @return: 0 or one of the ena_admin_hash_functions values.
*/
int ena_com_get_current_hash_function(struct ena_com_dev *ena_dev);
/* ena_com_fill_hash_function - Fill RSS hash function
* @ena_dev: ENA communication layer struct
* @func: The hash function (Toeplitz or crc)

3
drivers/net/ethernet/amazon/ena/ena_ethtool.c
View File

@ -736,6 +736,9 @@ static int ena_set_rxfh(struct net_device *netdev, const u32 *indir,
}
switch (hfunc) {
case ETH_RSS_HASH_NO_CHANGE:
func = ena_com_get_current_hash_function(ena_dev);
break;
case ETH_RSS_HASH_TOP:
func = ENA_ADMIN_TOEPLITZ;
break;