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Subject[PATCH net-next 12/18] net: mvpp2: improve the distribution of packets on CPUs when using RSS
Date
From: Antoine Tenart <antoine.tenart@bootlin.com>

This patch adds an extra indirection when setting the indirection table
into the RSS hardware table to improve the packets distribution across
CPUs. For example, if 2 queues are used on a multi-core system this new
indirection will choose two queues on two different CPUs instead of the
two first queues which are on the same first CPU.

Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
index c80a1a549224..7dafc8c425b8 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
@@ -107,6 +107,19 @@ void mvpp2_cls_oversize_rxq_set(struct mvpp2_port *port)
mvpp2_write(port->priv, MVPP2_CLS_SWFWD_PCTRL_REG, val);
}

+static inline u32 mvpp22_rxfh_indir(struct mvpp2_port *port, u32 rxq)
+{
+ int nrxqs, cpus = num_possible_cpus();
+
+ /* Number of RXQs per CPU */
+ nrxqs = port->nrxqs / cpus;
+
+ /* Indirection to better distribute the paquets on the CPUs when
+ * configuring the RSS queues.
+ */
+ return port->first_rxq + ((rxq * nrxqs + rxq / cpus) % port->nrxqs);
+}
+
void mvpp22_rss_fill_table(struct mvpp2_port *port, u32 table)
{
struct mvpp2 *priv = port->priv;
@@ -117,7 +130,8 @@ void mvpp22_rss_fill_table(struct mvpp2_port *port, u32 table)
MVPP22_RSS_INDEX_TABLE_ENTRY(i);
mvpp2_write(priv, MVPP22_RSS_INDEX, sel);

- mvpp2_write(priv, MVPP22_RSS_TABLE_ENTRY, port->indir[i]);
+ mvpp2_write(priv, MVPP22_RSS_TABLE_ENTRY,
+ mvpp22_rxfh_indir(port, port->indir[i]));
}
}

--
2.11.0
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