Re: [dpdk-dev] [PATCH V3 2/7] app/testpmd: fix DCB forwarding configuration

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

> -----Original Message-----
> From: Huisong Li <lihuisong@huawei.com>
> Sent: Tuesday, April 20, 2021 17:01
> To: dev@dpdk.org
> Cc: Yigit, Ferruh <ferruh.yigit@intel.com>; Li, Xiaoyun <xiaoyun.li@intel.com>;
> linuxarm@openeuler.org; lihuisong@huawei.com
> Subject: [PATCH V3 2/7] app/testpmd: fix DCB forwarding configuration
> 
> After DCB mode is configured, the operations of port stop and port start change
> the value of the global variable "dcb_test", As a result, the forwarding
> configuration from DCB to RSS mode, namely, “dcb_fwd_config_setup()” to
> "rss_fwd_config_setup()".
> 
> Currently, the 'dcb_flag' field in struct 'rte_port' indicates whether  the port is
> configured with DCB. And it is sufficient to have 'dcb_config'
> as a global variable to control the DCB test status. So this patch deletes the
> "dcb_test".
> 
> In addition, the 'dcb_config' is first set to 1 first in init_port_dcb_config(), but
> the function may fail.
>  So it should be moved to the end.

Change this to the following will be better:
In addition, setting 'dcb_config' at the end of init_port_dcb_config() in case that ports fail to enter DCB mode.

> 
> Fixes: 900550de04a7 ("app/testpmd: add dcb support")
> Fixes: ce8d561418d4 ("app/testpmd: add port configuration settings")
> Fixes: 7741e4cf16c0 ("app/testpmd: VMDq and DCB updates")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Huisong Li <lihuisong@huawei.com>
> Signed-off-by: Lijun Ou <oulijun@huawei.com>
> ---
>  app/test-pmd/testpmd.c | 18 ++++--------------  app/test-pmd/testpmd.h |  1 -
>  2 files changed, 4 insertions(+), 15 deletions(-)
> 
> diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c index
> d4be23f..a076b1d 100644
> --- a/app/test-pmd/testpmd.c
> +++ b/app/test-pmd/testpmd.c
> @@ -246,9 +246,6 @@ uint16_t mb_mempool_cache = DEF_MBUF_CACHE;
> /**< Size of mbuf mempool cache. */
>  /* current configuration is in DCB or not,0 means it is not in DCB mode */
> uint8_t dcb_config = 0;
> 
> -/* Whether the dcb is in testing status */ -uint8_t dcb_test = 0;
> -
>  /*
>   * Configurable number of RX/TX queues.
>   */
> @@ -2167,8 +2164,7 @@ start_packet_forwarding(int with_tx_first)
>  		return;
>  	}
> 
> -
> -	if(dcb_test) {
> +	if (dcb_config) {
>  		for (i = 0; i < nb_fwd_ports; i++) {
>  			pt_id = fwd_ports_ids[i];
>  			port = &ports[pt_id];
> @@ -2476,8 +2472,6 @@ start_port(portid_t pid)
>  	if (port_id_is_invalid(pid, ENABLED_WARN))
>  		return 0;
> 
> -	if(dcb_config)
> -		dcb_test = 1;
>  	RTE_ETH_FOREACH_DEV(pi) {
>  		if (pid != pi && pid != (portid_t)RTE_PORT_ALL)
>  			continue;
> @@ -2717,11 +2711,6 @@ stop_port(portid_t pid)
>  	portid_t peer_pl[RTE_MAX_ETHPORTS];
>  	int peer_pi;
> 
> -	if (dcb_test) {
> -		dcb_test = 0;
> -		dcb_config = 0;
> -	}
> -
>  	if (port_id_is_invalid(pid, ENABLED_WARN))
>  		return;
> 
> @@ -3625,8 +3614,6 @@ init_port_dcb_config(portid_t pid,
>  	rte_port = &ports[pid];
> 
>  	memset(&port_conf, 0, sizeof(struct rte_eth_conf));
> -	/* Enter DCB configuration status */
> -	dcb_config = 1;
> 
>  	port_conf.rxmode = rte_port->dev_conf.rxmode;
>  	port_conf.txmode = rte_port->dev_conf.txmode; @@ -3694,6 +3681,9
> @@ init_port_dcb_config(portid_t pid,
> 
>  	rte_port->dcb_flag = 1;
> 
> +	/* Enter DCB configuration status */
> +	dcb_config = 1;
> +
>  	return 0;
>  }
> 
> diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h index
> 9530ec5..432c66d 100644
> --- a/app/test-pmd/testpmd.h
> +++ b/app/test-pmd/testpmd.h
> @@ -425,7 +425,6 @@ extern uint64_t noisy_lkup_num_reads;  extern uint64_t
> noisy_lkup_num_reads_writes;
> 
>  extern uint8_t dcb_config;
> -extern uint8_t dcb_test;
> 
>  extern uint32_t mbuf_data_size_n;
>  extern uint16_t mbuf_data_size[MAX_SEGS_BUFFER_SPLIT];
> --
> 2.7.4