Re: [dpdk-stable] [dpdk-dev] [PATCH v2 2/2] examples/vmdq: fix RSS configuration

["Li, Xiaoyun" <xiaoyun.li@intel.com>]

> -----Original Message-----
> From: stable <stable-bounces@dpdk.org> On Behalf Of Wu, Jingjing
> Sent: Friday, April 3, 2020 08:08
> To: Jiang, JunyuX <junyux.jiang@intel.com>; dev@dpdk.org
> Cc: Yang, Qiming <qiming.yang@intel.com>; Yigit, Ferruh
> <ferruh.yigit@intel.com>; Jiang, JunyuX <junyux.jiang@intel.com>;
> stable@dpdk.org
> Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH v2 2/2] examples/vmdq: fix RSS
> configuration
> 
> 
> 
> > -----Original Message-----
> > From: dev <dev-bounces@dpdk.org> On Behalf Of Junyu Jiang
> > Sent: Wednesday, March 25, 2020 2:33 PM
> > To: dev@dpdk.org
> > Cc: Yang, Qiming <qiming.yang@intel.com>; Yigit, Ferruh
> > <ferruh.yigit@intel.com>; Jiang, JunyuX <junyux.jiang@intel.com>;
> > stable@dpdk.org
> > Subject: [dpdk-dev] [PATCH v2 2/2] examples/vmdq: fix RSS
> > configuration
> >
> > In order that all queues of pools can receive packets, add enable-rss
> > argument to change rss configuration.
> >
> > Fixes: 6bb97df521aa ("examples/vmdq: new app")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Junyu Jiang <junyux.jiang@intel.com>
> > Acked-by: Xiaoyun Li <xiaoyun.li@intel.com>
> > ---
> >  doc/guides/sample_app_ug/vmdq_forwarding.rst |  6 +--
> >  examples/vmdq/main.c                         | 39 +++++++++++++++++---
> >  2 files changed, 37 insertions(+), 8 deletions(-)
> >
> > diff --git a/doc/guides/sample_app_ug/vmdq_forwarding.rst
> > b/doc/guides/sample_app_ug/vmdq_forwarding.rst
> > index df23043d6..658d6742d 100644
> > --- a/doc/guides/sample_app_ug/vmdq_forwarding.rst
> > +++ b/doc/guides/sample_app_ug/vmdq_forwarding.rst
> > @@ -26,13 +26,13 @@ The Intel® 82599 10 Gigabit Ethernet Controller
> > NIC also supports the splitting  While the Intel® X710 or XL710
> > Ethernet Controller NICs support many configurations of VMDQ pools of
> > 4 or 8 queues each.
> >  And queues numbers for each VMDQ pool can be changed by setting
> > CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_VM
> >  in config/common_* file.
> > -The nb-pools parameter can be passed on the command line, after the EAL
> parameters:
> > +The nb-pools and enable-rss parameters can be passed on the command
> > +line, after the
> > EAL parameters:
> >
> >  .. code-block:: console
> >
> > -    ./build/vmdq_app [EAL options] -- -p PORTMASK --nb-pools NP
> > +    ./build/vmdq_app [EAL options] -- -p PORTMASK --nb-pools NP
> > + --enable-rss
> >
> > -where, NP can be 8, 16 or 32.
> > +where, NP can be 8, 16 or 32, rss is disabled by default.
> >
> >  In Linux* user space, the application can display statistics with the
> > number of packets received on each queue.
> >  To have the application display the statistics, send a SIGHUP signal
> > to the running application process.
> > diff --git a/examples/vmdq/main.c b/examples/vmdq/main.c index
> > 011110920..98032e6a3 100644
> > --- a/examples/vmdq/main.c
> > +++ b/examples/vmdq/main.c
> > @@ -59,6 +59,7 @@ static uint32_t enabled_port_mask;
> >  /* number of pools (if user does not specify any, 8 by default */
> > static uint32_t num_queues = 8;  static uint32_t num_pools = 8;
> > +static uint8_t rss_enable;
> >
> >  /* empty vmdq configuration structure. Filled in programatically */
> > static const struct rte_eth_conf vmdq_conf_default = { @@ -143,6
> > +144,13 @@ get_eth_conf(struct rte_eth_conf *eth_conf, uint32_t
> > num_pools)
> >  	(void)(rte_memcpy(eth_conf, &vmdq_conf_default, sizeof(*eth_conf)));
> >  	(void)(rte_memcpy(&eth_conf->rx_adv_conf.vmdq_rx_conf, &conf,
> >  		   sizeof(eth_conf->rx_adv_conf.vmdq_rx_conf)));
> > +	if (rss_enable) {
> > +		eth_conf->rxmode.mq_mode = ETH_MQ_RX_VMDQ_RSS;
> > +		eth_conf->rx_adv_conf.rss_conf.rss_hf = ETH_RSS_IP |
> > +							ETH_RSS_UDP |
> > +							ETH_RSS_TCP |
> > +							ETH_RSS_SCTP;
> > +	}
> >  	return 0;
> >  }
> >
> > @@ -164,6 +172,7 @@ port_init(uint16_t port, struct rte_mempool
> *mbuf_pool)
> >  	uint16_t q;
> >  	uint16_t queues_per_pool;
> >  	uint32_t max_nb_pools;
> > +	uint64_t rss_hf_tmp;
> >
> >  	/*
> >  	 * The max pool number from dev_info will be used to validate the
> > pool @@ -209,6 +218,17 @@ port_init(uint16_t port, struct rte_mempool
> *mbuf_pool)
> >  	if (!rte_eth_dev_is_valid_port(port))
> >  		return -1;
> >
> > +	rss_hf_tmp = port_conf.rx_adv_conf.rss_conf.rss_hf;
> > +	port_conf.rx_adv_conf.rss_conf.rss_hf &=
> > +		dev_info.flow_type_rss_offloads;
> > +	if (port_conf.rx_adv_conf.rss_conf.rss_hf != rss_hf_tmp) {
> > +		printf("Port %u modified RSS hash function based on hardware
> support,"
> 
> This is RSS offload type but not hash function.

* The *rss_hf* field of the *rss_conf* structure indicates the different
 * types of IPv4/IPv6 packets to which the RSS hashing must be applied.
 * Supplying an *rss_hf* equal to zero disables the RSS feature.

And in testpmd, it's the same.
port->dev_conf.rx_adv_conf.rss_conf.rss_hf =
				rss_hf & port->dev_info.flow_type_rss_offloads;