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Commit 662ae3fe authored by Antoine Tenart's avatar Antoine Tenart Committed by David S. Miller
Browse files

net: mvpp2: improve the distribution of packets on CPUs when using RSS 



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: default avatarAntoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: default avatarMaxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8179642b

drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c

+15 −1
Original line number Diff line number Diff line
@@ -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]));

	}

}