[dpdk-stable] patch 'app/testpmd: fix port topology in RSS forward config' has been queued to LTS release 16.11.5

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to LTS release 16.11.5

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 02/09/18. So please
shout if anyone has objections.

Thanks.

Luca Boccassi

---
>From 00f5e2b202092bfec2dad0bf6a7a98a331d40fc8 Mon Sep 17 00:00:00 2001
From: Matan Azrad <matan at mellanox.com>
Date: Mon, 5 Feb 2018 14:09:22 +0000
Subject: [PATCH] app/testpmd: fix port topology in RSS forward config

[ upstream commit 4deefb6f7107dd6a40900be4f1d6a6844a702505 ]

The testpmd user can configure port topology mode to define the port
topology between the testpmd forward ports(paired, chained and loop).

When multi-queue ports are configured by the user, the testpmd
streams are created by rss_fwd_config_setup() function, this function
doesn't take into account the chained topology mode and configures the
forward streams with paired topology mode in this case.

Configure the stream Tx port by dedicated function which calculates
a valid Tx port index as a function of the topology mode and the Rx
port index.

Fixes: af75078 ("first public release")

Signed-off-by: Matan Azrad <matan at mellanox.com>
---
 app/test-pmd/config.c | 49 +++++++++++++++++++++++++++++++------------------
 1 file changed, 31 insertions(+), 18 deletions(-)

diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 351df5715..69fa04be4 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -1155,6 +1155,36 @@ setup_fwd_config_of_each_lcore(struct fwd_config *cfg)
 	}
 }
 
+static portid_t
+fwd_topology_tx_port_get(portid_t rxp)
+{
+	static int warning_once = 1;
+
+	RTE_ASSERT(rxp < cur_fwd_config.nb_fwd_ports);
+
+	switch (port_topology) {
+	default:
+	case PORT_TOPOLOGY_PAIRED:
+		if ((rxp & 0x1) == 0) {
+			if (rxp + 1 < cur_fwd_config.nb_fwd_ports)
+				return rxp + 1;
+			if (warning_once) {
+				printf("\nWarning! port-topology=paired"
+				       " and odd forward ports number,"
+				       " the last port will pair with"
+				       " itself.\n\n");
+				warning_once = 0;
+			}
+			return rxp;
+		}
+		return rxp - 1;
+	case PORT_TOPOLOGY_CHAINED:
+		return (rxp + 1) % cur_fwd_config.nb_fwd_ports;
+	case PORT_TOPOLOGY_LOOP:
+		return rxp;
+	}
+}
+
 static void
 simple_fwd_config_setup(void)
 {
@@ -1217,11 +1247,6 @@ simple_fwd_config_setup(void)
  * For the RSS forwarding test all streams distributed over lcores. Each stream
  * being composed of a RX queue to poll on a RX port for input messages,
  * associated with a TX queue of a TX port where to send forwarded packets.
- * All packets received on the RX queue of index "RxQj" of the RX port "RxPi"
- * are sent on the TX queue "TxQl" of the TX port "TxPk" according to the two
- * following rules:
- *    - TxPk = (RxPi + 1) if RxPi is even, (RxPi - 1) if RxPi is odd
- *    - TxQl = RxQj
  */
 static void
 rss_fwd_config_setup(void)
@@ -1253,19 +1278,7 @@ rss_fwd_config_setup(void)
 		struct fwd_stream *fs;
 
 		fs = fwd_streams[sm_id];
-
-		if ((rxp & 0x1) == 0)
-			txp = (portid_t) (rxp + 1);
-		else
-			txp = (portid_t) (rxp - 1);
-		/*
-		 * if we are in loopback, simply send stuff out through the
-		 * ingress port
-		 */
-		if (port_topology == PORT_TOPOLOGY_LOOP ||
-		    txp >= cur_fwd_config.nb_fwd_ports)
-			txp = rxp;
-
+		txp = fwd_topology_tx_port_get(rxp);
 		fs->rx_port = fwd_ports_ids[rxp];
 		fs->rx_queue = rxq;
 		fs->tx_port = fwd_ports_ids[txp];
-- 
2.14.2