linux-kernel - [PATCH net-next 10/18] net: mvpp2: use one RSS table per port

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Date:   Thu, 12 Jul 2018 13:54:19 +0200
From:   Maxime Chevallier <maxime.chevallier@...tlin.com>
To:     davem@...emloft.net
Cc:     Maxime Chevallier <maxime.chevallier@...tlin.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        thomas.petazzoni@...tlin.com, gregory.clement@...tlin.com,
        miquel.raynal@...tlin.com, nadavh@...vell.com, stefanc@...vell.com,
        ymarkman@...vell.com, mw@...ihalf.com
Subject: [PATCH net-next 10/18] net: mvpp2: use one RSS table per port

PPv2 Controller has 8 RSS Tables, of 32 entries each. A lookup in the
RXQ2RSS_TABLE is performed for each incoming packet, and the RSS Table
to be used is chosen according to the default rx queue that would be
used for the packet.

This default rx queue is set in the Lookup_id Table (also called
Decoding Table), and is equal to the port->first_rxq.

Since the Classifier itself isn't active at any time for the moment,
this doesn't have a direct effect, the default rx queue at the moment is
the one where all packets end-up into.

Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
index fe4bcaf983b2..c8cf3db85ffe 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
@@ -115,23 +115,22 @@ void mvpp22_init_rss(struct mvpp2_port *port)
 	/* Set the table width: replace the whole classifier Rx queue number
 	 * with the ones configured in RSS table entries.
 	 */
-	mvpp2_write(priv, MVPP22_RSS_INDEX, MVPP22_RSS_INDEX_TABLE(0));
+	mvpp2_write(priv, MVPP22_RSS_INDEX, MVPP22_RSS_INDEX_TABLE(port->id));
 	mvpp2_write(priv, MVPP22_RSS_WIDTH, 8);
 
-	/* Loop through the classifier Rx Queues and map them to a RSS table.
-	 * Map them all to the first table (0) by default.
+	/* The default RxQ is used as a key to select the RSS table to use.
+	 * We use one RSS table per port.
 	 */
-	for (i = 0; i < MVPP2_CLS_RX_QUEUES; i++) {
-		mvpp2_write(priv, MVPP22_RSS_INDEX, MVPP22_RSS_INDEX_QUEUE(i));
-		mvpp2_write(priv, MVPP22_RXQ2RSS_TABLE,
-			    MVPP22_RSS_TABLE_POINTER(0));
-	}
+	mvpp2_write(priv, MVPP22_RSS_INDEX,
+		    MVPP22_RSS_INDEX_QUEUE(port->first_rxq));
+	mvpp2_write(priv, MVPP22_RXQ2RSS_TABLE,
+		    MVPP22_RSS_TABLE_POINTER(port->id));
 
 	/* Configure the first table to evenly distribute the packets across
 	 * real Rx Queues. The table entries map a hash to a port Rx Queue.
 	 */
 	for (i = 0; i < MVPP22_RSS_TABLE_ENTRIES; i++) {
-		u32 sel = MVPP22_RSS_INDEX_TABLE(0) |
+		u32 sel = MVPP22_RSS_INDEX_TABLE(port->id) |
 			  MVPP22_RSS_INDEX_TABLE_ENTRY(i);
 		mvpp2_write(priv, MVPP22_RSS_INDEX, sel);
 
-- 
2.11.0