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From: <sameehj@amazon.com>
To: <davem@davemloft.net>, <netdev@vger.kernel.org>
Cc: Arthur Kiyanovski <akiyano@amazon.com>, <dwmw@amazon.com>,
	<zorik@amazon.com>, <matua@amazon.com>, <saeedb@amazon.com>,
	<msw@amazon.com>, <aliguori@amazon.com>, <nafea@amazon.com>,
	<gtzalik@amazon.com>, <netanel@amazon.com>, <alisaidi@amazon.com>,
	<benh@amazon.com>, <sameehj@amazon.com>, <ndagan@amazon.com>
Subject: [PATCH V3 net-next 01/12] net: ena: avoid unnecessary admin command when RSS function set fails
Date: Sun, 3 May 2020 09:52:10 +0000	[thread overview]
Message-ID: <20200503095221.6408-2-sameehj@amazon.com> (raw)
In-Reply-To: <20200503095221.6408-1-sameehj@amazon.com>

From: Arthur Kiyanovski <akiyano@amazon.com>

Currently when ena_set_hash_function() fails the hash function is
restored to the previous value by calling an admin command to get
the hash function from the device.

In this commit we avoid the admin command, by saving the previous
hash function before calling ena_set_hash_function() and using this
previous value to restore the hash function in case of failure of
ena_set_hash_function().

Signed-off-by: Sameeh Jubran <sameehj@amazon.com>
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
---
 drivers/net/ethernet/amazon/ena/ena_com.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c
index a250046b8e18..424ba08955e9 100644
--- a/drivers/net/ethernet/amazon/ena/ena_com.c
+++ b/drivers/net/ethernet/amazon/ena/ena_com.c
@@ -2286,6 +2286,7 @@ int ena_com_fill_hash_function(struct ena_com_dev *ena_dev,
 	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;
 	int rc;
 
 	/* Make sure size is a mult of DWs */
@@ -2325,12 +2326,13 @@ 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;
 }
-- 
2.24.1.AMZN


  reply	other threads:[~2020-05-03  9:52 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-03  9:52 [PATCH V3 net-next 00/12] Enhance current features in ena driver sameehj
2020-05-03  9:52 ` sameehj [this message]
2020-05-03  9:52 ` [PATCH V3 net-next 02/12] net: ena: fix error returning in ena_com_get_hash_function() sameehj
2020-05-03  9:52 ` [PATCH V3 net-next 03/12] net: ena: allow setting the hash function without changing the key sameehj
2020-05-03  9:52 ` [PATCH V3 net-next 04/12] net: ena: change default RSS hash function to Toeplitz sameehj
2020-05-03  9:52 ` [PATCH V3 net-next 05/12] net: ena: changes to RSS hash key allocation sameehj
2020-05-03  9:52 ` [PATCH V3 net-next 06/12] net: ena: remove code that does nothing sameehj
2020-05-03  9:52 ` [PATCH V3 net-next 07/12] net: ena: add unmask interrupts statistics to ethtool sameehj
2020-05-03  9:52 ` [PATCH V3 net-next 08/12] net: ena: add support for reporting of packet drops sameehj
2020-05-03  9:52 ` [PATCH V3 net-next 09/12] net: ena: drop superfluous prototype sameehj
2020-05-03  9:52 ` [PATCH V3 net-next 10/12] net: ena: use SHUTDOWN as reset reason when closing interface sameehj
2020-05-03  9:52 ` [PATCH V3 net-next 11/12] net: ena: cosmetic: remove unnecessary spaces and tabs in ena_com.h macros sameehj
2020-05-03  9:52 ` [PATCH V3 net-next 12/12] net: ena: cosmetic: extract code to ena_indirection_table_set() sameehj
2020-05-03 23:01 ` [PATCH V3 net-next 00/12] Enhance current features in ena driver David Miller

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