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Message-ID: <20200129140422.20166-7-sameehj@amazon.com>
Date: Wed, 29 Jan 2020 14:04:17 +0000
From: Sameeh Jubran <sameehj@...zon.com>
To: <davem@...emloft.net>, <netdev@...r.kernel.org>
CC: Arthur Kiyanovski <akiyano@...zon.com>, <dwmw@...zon.com>,
<zorik@...zon.com>, <matua@...zon.com>, <saeedb@...zon.com>,
<msw@...zon.com>, <aliguori@...zon.com>, <nafea@...zon.com>,
<gtzalik@...zon.com>, <netanel@...zon.com>, <alisaidi@...zon.com>,
<benh@...zon.com>, <sameehj@...zon.com>, <ndagan@...zon.com>
Subject: [PATCH V1 net 06/11] net: ena: rss: fix failure to get indirection table
From: Arthur Kiyanovski <akiyano@...zon.com>
Bug:
The get indirection table will fail on older hardware versions. This
happens because getting/setting the hash function is not supported on
this hardware. In short ena_indirection_table_get() succeeds while
the call to ena_com_get_hash_function() fails when ena_get_rxfh() is
executed.
Fix:
Simply set the hash function to the default value - Toeplitz - in case the
error is EOPNOTSUPP.
Also:
* Separate hash and key retrieval
* Fix restoring the hash function in ena_com_fill_hash_function()
* Reverse christmas tree in ena_com_fill_hash_function()
Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Sameeh Jubran <sameehj@...zon.com>
Signed-off-by: Arthur Kiyanovski <akiyano@...zon.com>
---
drivers/net/ethernet/amazon/ena/ena_com.c | 24 ++++++++++++-------
drivers/net/ethernet/amazon/ena/ena_com.h | 22 ++++++++++++-----
drivers/net/ethernet/amazon/ena/ena_ethtool.c | 10 +++++---
3 files changed, 39 insertions(+), 17 deletions(-)
diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c
index 9e6c50b97..8bcf76f92 100644
--- a/drivers/net/ethernet/amazon/ena/ena_com.c
+++ b/drivers/net/ethernet/amazon/ena/ena_com.c
@@ -2295,12 +2295,14 @@ int ena_com_fill_hash_function(struct ena_com_dev *ena_dev,
enum ena_admin_hash_functions func,
const u8 *key, u16 key_len, u32 init_val)
{
- struct ena_rss *rss = &ena_dev->rss;
+ struct ena_admin_feature_rss_flow_hash_control *hash_key;
struct ena_admin_get_feat_resp get_resp;
- struct ena_admin_feature_rss_flow_hash_control *hash_key =
- rss->hash_key;
+ enum ena_admin_hash_functions old_func;
+ struct ena_rss *rss = &ena_dev->rss;
int rc;
+ hash_key = rss->hash_key;
+
/* Make sure size is a mult of DWs */
if (unlikely(key_len & 0x3))
return -EINVAL;
@@ -2338,24 +2340,22 @@ int ena_com_fill_hash_function(struct ena_com_dev *ena_dev,
return -EINVAL;
}
+ old_func = rss->hash_func;
rss->hash_func = func;
rc = ena_com_set_hash_function(ena_dev);
/* Restore the old function */
if (unlikely(rc))
- ena_com_get_hash_function(ena_dev, NULL, NULL);
+ rss->hash_func = old_func;
return rc;
}
int ena_com_get_hash_function(struct ena_com_dev *ena_dev,
- enum ena_admin_hash_functions *func,
- u8 *key)
+ enum ena_admin_hash_functions *func)
{
struct ena_rss *rss = &ena_dev->rss;
struct ena_admin_get_feat_resp get_resp;
- struct ena_admin_feature_rss_flow_hash_control *hash_key =
- rss->hash_key;
int rc;
rc = ena_com_get_feature_ex(ena_dev, &get_resp,
@@ -2373,6 +2373,14 @@ int ena_com_get_hash_function(struct ena_com_dev *ena_dev,
if (func)
*func = rss->hash_func;
+ return 0;
+}
+
+int ena_com_get_hash_key(struct ena_com_dev *ena_dev, u8 *key)
+{
+ struct ena_admin_feature_rss_flow_hash_control *hash_key =
+ ena_dev->rss.hash_key;
+
if (key)
memcpy(key, hash_key->key, (size_t)(hash_key->keys_num) << 2);
diff --git a/drivers/net/ethernet/amazon/ena/ena_com.h b/drivers/net/ethernet/amazon/ena/ena_com.h
index 91c048872..ea925bb01 100644
--- a/drivers/net/ethernet/amazon/ena/ena_com.h
+++ b/drivers/net/ethernet/amazon/ena/ena_com.h
@@ -687,13 +687,11 @@ int ena_com_fill_hash_function(struct ena_com_dev *ena_dev,
*/
int ena_com_set_hash_function(struct ena_com_dev *ena_dev);
-/* ena_com_get_hash_function - Retrieve the hash function and the hash key
- * from the device.
+/* ena_com_get_hash_function - Retrieve the hash function from the device.
* @ena_dev: ENA communication layer struct
* @func: hash function
- * @key: hash key
*
- * Retrieve the hash function and the hash key from the device.
+ * Retrieve the hash function from the device.
*
* @note: If the caller called ena_com_fill_hash_function but didn't flash
* it to the device, the new configuration will be lost.
@@ -701,8 +699,20 @@ int ena_com_set_hash_function(struct ena_com_dev *ena_dev);
* @return: 0 on Success and negative value otherwise.
*/
int ena_com_get_hash_function(struct ena_com_dev *ena_dev,
- enum ena_admin_hash_functions *func,
- u8 *key);
+ enum ena_admin_hash_functions *func);
+
+/* ena_com_get_hash_key - Retrieve the hash key
+ * @ena_dev: ENA communication layer struct
+ * @key: hash key
+ *
+ * Retrieve the hash key.
+ *
+ * @note: If the caller called ena_com_fill_hash_key but didn't flash
+ * it to the device, the new configuration will be lost.
+ *
+ * @return: 0 on Success and negative value otherwise.
+ */
+int ena_com_get_hash_key(struct ena_com_dev *ena_dev, u8 *key);
/* ena_com_fill_hash_ctrl - Fill RSS hash control
* @ena_dev: ENA communication layer struct.
diff --git a/drivers/net/ethernet/amazon/ena/ena_ethtool.c b/drivers/net/ethernet/amazon/ena/ena_ethtool.c
index 8b56383b6..d0d91dbe0 100644
--- a/drivers/net/ethernet/amazon/ena/ena_ethtool.c
+++ b/drivers/net/ethernet/amazon/ena/ena_ethtool.c
@@ -640,7 +640,7 @@ static int ena_get_rxfh(struct net_device *netdev, u32 *indir, u8 *key,
u8 *hfunc)
{
struct ena_adapter *adapter = netdev_priv(netdev);
- enum ena_admin_hash_functions ena_func;
+ enum ena_admin_hash_functions ena_func = ENA_ADMIN_TOEPLITZ;
u8 func;
int rc;
@@ -648,10 +648,14 @@ static int ena_get_rxfh(struct net_device *netdev, u32 *indir, u8 *key,
if (rc)
return rc;
- rc = ena_com_get_hash_function(adapter->ena_dev, &ena_func, key);
+ rc = ena_com_get_hash_key(adapter->ena_dev, key);
if (rc)
return rc;
+ rc = ena_com_get_hash_function(adapter->ena_dev, &ena_func);
+ if (rc && rc != -EOPNOTSUPP)
+ return rc;
+
switch (ena_func) {
case ENA_ADMIN_TOEPLITZ:
func = ETH_RSS_HASH_TOP;
@@ -668,7 +672,7 @@ static int ena_get_rxfh(struct net_device *netdev, u32 *indir, u8 *key,
if (hfunc)
*hfunc = func;
- return rc;
+ return 0;
}
static int ena_set_rxfh(struct net_device *netdev, const u32 *indir,
--
2.24.1.AMZN
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