Re: [dpdk-dev] [PATCH v3 2/7] service cores: EAL init changes

[Jerin Jacob <jerin.jacob@caviumnetworks.com>]

-----Original Message-----
> Date: Sun, 2 Jul 2017 22:35:09 +0100
> From: Harry van Haaren <harry.van.haaren@intel.com>
> To: dev@dpdk.org
> CC: jerin.jacob@caviumnetworks.com, thomas@monjalon.net,
>  keith.wiles@intel.com, bruce.richardson@intel.com, Harry van Haaren
>  <harry.van.haaren@intel.com>
> Subject: [PATCH v3 2/7] service cores: EAL init changes
> X-Mailer: git-send-email 2.7.4
> 
> This commit shows the changes required in rte_eal_init()
> to transparently launch the service threads. The threads
> are launched into the service worker functions here because
> after rte_eal_init() the application is not gauranteed to
> call any other DPDK API.
> 
> As the registration of services happens at initialization
> time, the services that require CPU time are already available
> when we reach the end of rte_eal_init().
> 
> Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>
> 
> ---
> 
> v2 comments:
> - Include BSD implementation (Jerin)
> - Move details of core-tracking into rte_service_lcore_add(Jerin)
> - Given there are changes other to suggested, not using Ack
> ---
>  lib/librte_eal/bsdapp/eal/eal.c   | 22 ++++++++++++++++++++++
>  lib/librte_eal/linuxapp/eal/eal.c | 23 +++++++++++++++++++++++
>  2 files changed, 45 insertions(+)
> 
> diff --git a/lib/librte_eal/bsdapp/eal/eal.c b/lib/librte_eal/bsdapp/eal/eal.c
> index 05f0c1f..4f7dcb3 100644
> --- a/lib/librte_eal/bsdapp/eal/eal.c
> +++ b/lib/librte_eal/bsdapp/eal/eal.c
> @@ -653,6 +653,17 @@ rte_eal_init(int argc, char **argv)
>  	rte_eal_mp_remote_launch(sync_func, NULL, SKIP_MASTER);
>  	rte_eal_mp_wait_lcore();
>  
> +	/* initialize services first so vdevs can register during bus_probe.
> +	 * Ignore return value of already initialized, this means EAL parameter
> +	 * -s was used to set a service-core mask.
> +	 */
> +	ret = rte_service_init();
> +	if (ret) {
> +		rte_eal_init_alert("rte_service_init() failed\n");
> +		rte_errno = ENOEXEC;
> +		return -1;
> +	}
> +
>  	/* Probe all the buses and devices/drivers on them */
>  	if (rte_bus_probe()) {
>  		rte_eal_init_alert("Cannot probe devices\n");
> @@ -660,6 +671,17 @@ rte_eal_init(int argc, char **argv)
>  		return -1;
>  	}
>  
> +	/* initialize default services configuration */
> +	uint32_t service_cores[RTE_MAX_LCORE];
> +	int count = rte_service_lcore_list(service_cores, RTE_MAX_LCORE);
> +	for (i = 0; i < count; i++)
> +		rte_service_lcore_start(service_cores[i]);
> +	ret = rte_service_set_default_mapping();
> +	if (ret) {
> +		rte_errno = ENOEXEC;
> +		return -1;
> +	}
> +
>  	rte_eal_mcfg_complete();
>  
>  	return fctret;
> diff --git a/lib/librte_eal/linuxapp/eal/eal.c b/lib/librte_eal/linuxapp/eal/eal.c
> index 7c78f2d..d63dd87 100644
> --- a/lib/librte_eal/linuxapp/eal/eal.c
> +++ b/lib/librte_eal/linuxapp/eal/eal.c
> @@ -78,6 +78,7 @@
>  #include <rte_version.h>
>  #include <rte_atomic.h>
>  #include <malloc_heap.h>
> +#include <rte_service_private.h>

Not included this header file for bsdapp compilation. It should fail to
compile. Right?