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

["Wu, Jingjing" <jingjing.wu@intel.com>]

> -----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.