diff options
| author |   Antoine Tenart <antoine.tenart@bootlin.com> | 2018-07-12 13:54:21 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-07-12 17:30:48 -0700 |
| commit | 662ae3fe65000a6b7ceeed1ecf510346d8fec447 (patch) | |
| tree | ec221951db8afc2890bfd0da30d4d2282f7924d8 /drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c | |
| parent | net: mvpp2: RSS indirection table support (diff) | |
| download | linux-dev-662ae3fe65000a6b7ceeed1ecf510346d8fec447.tar.xz linux-dev-662ae3fe65000a6b7ceeed1ecf510346d8fec447.zip | |
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: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c')
| -rw-r--r-- | drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c | 16 |
1 files changed, 15 insertions, 1 deletions
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])); } } |