netdev - [PATCH V3 net-next 05/12] net: ena: changes to RSS hash key allocation

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Date:   Sun, 3 May 2020 09:52:14 +0000
From:   <sameehj@...zon.com>
To:     <davem@...emloft.net>, <netdev@...r.kernel.org>
CC:     Sameeh Jubran <sameehj@...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>, <akiyano@...zon.com>, <ndagan@...zon.com>
Subject: [PATCH V3 net-next 05/12] net: ena: changes to RSS hash key allocation

From: Sameeh Jubran <sameehj@...zon.com>

This commit contains 2 cosmetic changes:

1. Use ena_com_check_supported_feature_id() in
   ena_com_hash_key_fill_default_key() instead of rewriting
   its implementation. This also saves us a superfluous admin
   command by using the cached value.

2. Change if conditions in ena_com_rss_init() to be clearer.

Signed-off-by: Arthur Kiyanovski <akiyano@...zon.com>
Signed-off-by: Sameeh Jubran <sameehj@...zon.com>
---
 drivers/net/ethernet/amazon/ena/ena_com.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c
index d428d0606166..b51bf62af11b 100644
--- a/drivers/net/ethernet/amazon/ena/ena_com.c
+++ b/drivers/net/ethernet/amazon/ena/ena_com.c
@@ -1067,16 +1067,10 @@ static void ena_com_hash_key_fill_default_key(struct ena_com_dev *ena_dev)
 static int ena_com_hash_key_allocate(struct ena_com_dev *ena_dev)
 {
 	struct ena_rss *rss = &ena_dev->rss;
-	struct ena_admin_get_feat_resp get_resp;
-	int rc;
 
-	rc = ena_com_get_feature_ex(ena_dev, &get_resp,
-				    ENA_ADMIN_RSS_HASH_FUNCTION,
-				    ena_dev->rss.hash_key_dma_addr,
-				    sizeof(ena_dev->rss.hash_key), 0);
-	if (unlikely(rc)) {
+	if (!ena_com_check_supported_feature_id(ena_dev,
+						ENA_ADMIN_RSS_HASH_FUNCTION))
 		return -EOPNOTSUPP;
-	}
 
 	rss->hash_key =
 		dma_alloc_coherent(ena_dev->dmadev, sizeof(*rss->hash_key),
@@ -2650,10 +2644,10 @@ int ena_com_rss_init(struct ena_com_dev *ena_dev, u16 indr_tbl_log_size)
 	 * ignore this error and have indirection table support only.
 	 */
 	rc = ena_com_hash_key_allocate(ena_dev);
-	if (unlikely(rc) && rc != -EOPNOTSUPP)
-		goto err_hash_key;
-	else if (rc != -EOPNOTSUPP)
+	if (likely(!rc))
 		ena_com_hash_key_fill_default_key(ena_dev);
+	else if (rc != -EOPNOTSUPP)
+		goto err_hash_key;
 
 	rc = ena_com_hash_ctrl_init(ena_dev);
 	if (unlikely(rc))
-- 
2.24.1.AMZN