DPDK-dev Archive on lore.kernel.org
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From: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
To: David Marchand <david.marchand@redhat.com>,
	"dev@dpdk.org" <dev@dpdk.org>
Cc: "jerinjacobk@gmail.com" <jerinjacobk@gmail.com>,
	"Richardson, Bruce" <bruce.richardson@intel.com>,
	"mdr@ashroe.eu" <mdr@ashroe.eu>,
	"thomas@monjalon.net" <thomas@monjalon.net>,
	"arybchenko@solarflare.com" <arybchenko@solarflare.com>,
	"ktraynor@redhat.com" <ktraynor@redhat.com>,
	"Stokes, Ian" <ian.stokes@intel.com>,
	"i.maximets@ovn.org" <i.maximets@ovn.org>,
	Neil Horman <nhorman@tuxdriver.com>
Subject: Re: [dpdk-dev] [PATCH v4 7/9] eal: add lcore init callbacks
Date: Mon, 29 Jun 2020 12:46:06 +0000
Message-ID: <BYAPR11MB33012B0800FBEF91A6B79CAC9A6E0@BYAPR11MB3301.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20200626144736.11011-8-david.marchand@redhat.com>


 
> diff --git a/lib/librte_eal/common/eal_common_lcore.c b/lib/librte_eal/common/eal_common_lcore.c
> index a61824a779..52c46a4cea 100644
> --- a/lib/librte_eal/common/eal_common_lcore.c
> +++ b/lib/librte_eal/common/eal_common_lcore.c
> @@ -224,11 +224,114 @@ rte_socket_id_by_idx(unsigned int idx)
>  }
> 
>  static rte_spinlock_t lcore_lock = RTE_SPINLOCK_INITIALIZER;
> +struct lcore_callback {
> +	TAILQ_ENTRY(lcore_callback) next;
> +	char *name;
> +	rte_lcore_init_cb init;
> +	rte_lcore_uninit_cb uninit;
> +	void *arg;
> +};
> +static TAILQ_HEAD(lcore_callbacks_head, lcore_callback) lcore_callbacks =
> +	TAILQ_HEAD_INITIALIZER(lcore_callbacks);
> +
> +static int
> +callback_init(struct lcore_callback *callback, unsigned int lcore_id)
> +{
> +	if (callback->init == NULL)
> +		return 0;
> +	RTE_LOG(DEBUG, EAL, "Call init for lcore callback %s, lcore_id %u\n",
> +		callback->name, lcore_id);
> +	return callback->init(lcore_id, callback->arg);
> +}
> +
> +static void
> +callback_uninit(struct lcore_callback *callback, unsigned int lcore_id)
> +{
> +	if (callback->uninit == NULL)
> +		return;
> +	RTE_LOG(DEBUG, EAL, "Call uninit for lcore callback %s, lcore_id %u\n",
> +		callback->name, lcore_id);
> +	callback->uninit(lcore_id, callback->arg);
> +}
> +
> +void *
> +rte_lcore_callback_register(const char *name, rte_lcore_init_cb init,
> +	rte_lcore_uninit_cb uninit, void *arg)
> +{
> +	struct rte_config *cfg = rte_eal_get_configuration();
> +	struct lcore_callback *callback;
> +	unsigned int lcore_id;
> +
> +	callback = calloc(1, sizeof(*callback));
> +	if (callback == NULL)
> +		return NULL;
> +	if (asprintf(&callback->name, "%s-%p", name, arg) == -1) {

If name is null, I presume asprintf() would segfault, right?
As this is a public (and control-plane) API, I think it is worth to
add formal checking for input parameters.
Same for other new public functions. 

> +		free(callback);
> +		return NULL;
> +	}
> +	callback->init = init;
> +	callback->uninit = uninit;
> +	callback->arg = arg;
> +	rte_spinlock_lock(&lcore_lock);
> +	if (callback->init == NULL)
> +		goto no_init;
> +	for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
> +		if (cfg->lcore_role[lcore_id] == ROLE_OFF)
> +			continue;
> +		if (callback_init(callback, lcore_id) == 0)
> +			continue;
> +		/* Callback refused init for this lcore, uninitialize all
> +		 * previous lcore.
> +		 */
> +		for (; lcore_id != 0; lcore_id--) {
> +			if (cfg->lcore_role[lcore_id - 1] == ROLE_OFF)
> +				continue;
> +			callback_uninit(callback, lcore_id - 1);
> +		}

Just as a nit, you can do here instead:
while (lcore_id-- != 0) { if (cfg->lcore_role[lcore_id] == ROLE_OFF) ...}
To avoid 'lcore_id -1' inside loop body.
Might look a bit nicer.

> +		free(callback);

I think you forgot:
free(callback->name);
here.
Might be worth to have a separate helper function around these 2 frees.

> +		callback = NULL;
> +		goto out;
> +	}
> +no_init:
> +	TAILQ_INSERT_TAIL(&lcore_callbacks, callback, next);
> +	RTE_LOG(DEBUG, EAL, "Registered new lcore callback %s (%sinit, %suninit).\n",
> +		callback->name, callback->init == NULL ? "NO " : "",
> +		callback->uninit == NULL ? "NO " : "");
> +out:
> +	rte_spinlock_unlock(&lcore_lock);
> +	return callback;
> +}
> +
> +void
> +rte_lcore_callback_unregister(void *handle)
> +{
> +	struct rte_config *cfg = rte_eal_get_configuration();
> +	struct lcore_callback *callback = handle;
> +	unsigned int lcore_id;
> +
> +	rte_spinlock_lock(&lcore_lock);
> +	if (callback->uninit == NULL)
> +		goto no_uninit;
> +	for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
> +		if (cfg->lcore_role[lcore_id] == ROLE_OFF)
> +			continue;
> +		callback_uninit(callback, lcore_id);
> +	}
> +no_uninit:
> +	TAILQ_REMOVE(&lcore_callbacks, callback, next);
> +	rte_spinlock_unlock(&lcore_lock);
> +	RTE_LOG(DEBUG, EAL, "Unregistered lcore callback %s-%p.\n",
> +		callback->name, callback->arg);
> +	free(callback->name);
> +	free(callback);
> +}
> 
>  unsigned int
>  eal_lcore_non_eal_allocate(void)
>  {
>  	struct rte_config *cfg = rte_eal_get_configuration();
> +	struct lcore_callback *callback;
> +	struct lcore_callback *prev;
>  	unsigned int lcore_id;
> 
>  	if (cfg->process_type == RTE_PROC_SECONDARY ||
> @@ -244,8 +347,29 @@ eal_lcore_non_eal_allocate(void)
>  		cfg->lcore_count++;
>  		break;
>  	}
> -	if (lcore_id == RTE_MAX_LCORE)
> +	if (lcore_id == RTE_MAX_LCORE) {
>  		RTE_LOG(DEBUG, EAL, "No lcore available.\n");
> +		goto out;
> +	}
> +	TAILQ_FOREACH(callback, &lcore_callbacks, next) {
> +		if (callback_init(callback, lcore_id) == 0)
> +			continue;
> +		/* Callback refused init for this lcore, call uninit for all
> +		 * previous callbacks.
> +		 */
> +		prev = TAILQ_PREV(callback, lcore_callbacks_head, next);
> +		while (prev != NULL) {
> +			callback_uninit(prev, lcore_id);
> +			prev = TAILQ_PREV(prev, lcore_callbacks_head, next);
> +		}
> +		RTE_LOG(DEBUG, EAL, "Initialization refused for lcore %u.\n",
> +			lcore_id);
> +		cfg->lcore_role[lcore_id] = ROLE_OFF;
> +		cfg->lcore_count--;
> +		lcore_id = RTE_MAX_LCORE;
> +		goto out;
> +	}
> +out:
>  	rte_spinlock_unlock(&lcore_lock);
>  	return lcore_id;
>  }
> @@ -254,11 +378,15 @@ void
>  eal_lcore_non_eal_release(unsigned int lcore_id)
>  {
>  	struct rte_config *cfg = rte_eal_get_configuration();
> +	struct lcore_callback *callback;
> 
>  	rte_spinlock_lock(&lcore_lock);
> -	if (cfg->lcore_role[lcore_id] == ROLE_NON_EAL) {
> -		cfg->lcore_role[lcore_id] = ROLE_OFF;
> -		cfg->lcore_count--;
> -	}
> +	if (cfg->lcore_role[lcore_id] != ROLE_NON_EAL)
> +		goto out;
> +	TAILQ_FOREACH(callback, &lcore_callbacks, next)
> +		callback_uninit(callback, lcore_id);
> +	cfg->lcore_role[lcore_id] = ROLE_OFF;
> +	cfg->lcore_count--;
> +out:
>  	rte_spinlock_unlock(&lcore_lock);
>  }

  reply index

Thread overview: 126+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-10 14:44 [dpdk-dev] [PATCH 0/7] Register external threads as lcore David Marchand
2020-06-10 14:45 ` [dpdk-dev] [PATCH 1/7] eal: relocate per thread symbols to common David Marchand
2020-06-10 14:45 ` [dpdk-dev] [PATCH 2/7] eal: fix multiple definition of per lcore thread id David Marchand
2020-06-15  6:46   ` Kinsella, Ray
2020-06-10 14:45 ` [dpdk-dev] [PATCH 3/7] eal: introduce thread init helper David Marchand
2020-06-10 14:45 ` [dpdk-dev] [PATCH 4/7] eal: introduce thread uninit helper David Marchand
2020-06-10 14:45 ` [dpdk-dev] [PATCH 5/7] eal: register non-EAL threads as lcore David Marchand
2020-06-15  6:43   ` Kinsella, Ray
2020-06-10 14:45 ` [dpdk-dev] [PATCH 6/7] eal: dump lcores David Marchand
2020-06-15  6:40   ` Kinsella, Ray
2020-06-10 14:45 ` [dpdk-dev] [PATCH 7/7] eal: add lcore hotplug notifications David Marchand
2020-06-15  6:34   ` Kinsella, Ray
2020-06-15  7:13     ` David Marchand
2020-06-10 15:09 ` [dpdk-dev] [PATCH 0/7] Register external threads as lcore Jerin Jacob
2020-06-10 15:13   ` Bruce Richardson
2020-06-10 15:18   ` David Marchand
2020-06-10 15:33     ` Jerin Jacob
2020-06-15  7:11       ` David Marchand
2020-06-19 16:22 ` [dpdk-dev] [PATCH v2 0/9] Register non-EAL " David Marchand
2020-06-19 16:22   ` [dpdk-dev] [PATCH v2 1/9] eal: relocate per thread symbols to common David Marchand
2020-06-19 16:22   ` [dpdk-dev] [PATCH v2 2/9] eal: fix multiple definition of per lcore thread id David Marchand
2020-06-19 16:22   ` [dpdk-dev] [PATCH v2 3/9] eal: introduce thread init helper David Marchand
2020-06-19 16:22   ` [dpdk-dev] [PATCH v2 4/9] eal: introduce thread uninit helper David Marchand
2020-06-19 16:22   ` [dpdk-dev] [PATCH v2 5/9] eal: move lcore role code David Marchand
2020-06-19 16:22   ` [dpdk-dev] [PATCH v2 6/9] eal: register non-EAL threads as lcores David Marchand
2020-06-19 16:22   ` [dpdk-dev] [PATCH v2 7/9] eal: add lcore init callbacks David Marchand
2020-06-19 16:22   ` [dpdk-dev] [PATCH v2 8/9] eal: add lcore iterators David Marchand
2020-06-20  2:21     ` Stephen Hemminger
2020-06-19 16:22   ` [dpdk-dev] [PATCH v2 9/9] mempool/bucket: handle non-EAL lcores David Marchand
2020-06-22 13:25 ` [dpdk-dev] [PATCH v3 0/9] Register non-EAL threads as lcore David Marchand
2020-06-22 13:25   ` [dpdk-dev] [PATCH v3 1/9] eal: relocate per thread symbols to common David Marchand
2020-06-22 13:25   ` [dpdk-dev] [PATCH v3 2/9] eal: fix multiple definition of per lcore thread id David Marchand
2020-06-22 13:25   ` [dpdk-dev] [PATCH v3 3/9] eal: introduce thread init helper David Marchand
2020-06-22 13:25   ` [dpdk-dev] [PATCH v3 4/9] eal: introduce thread uninit helper David Marchand
2020-06-22 13:25   ` [dpdk-dev] [PATCH v3 5/9] eal: move lcore role code David Marchand
2020-06-22 13:25   ` [dpdk-dev] [PATCH v3 6/9] eal: register non-EAL threads as lcores David Marchand
2020-06-22 15:49     ` Ananyev, Konstantin
2020-06-22 16:37       ` Ananyev, Konstantin
2020-06-23  7:49       ` David Marchand
2020-06-23  9:14         ` Bruce Richardson
2020-06-23 12:49           ` David Marchand
2020-06-23 13:15         ` Ananyev, Konstantin
2020-06-24  9:23           ` David Marchand
2020-06-24  9:56             ` Bruce Richardson
2020-06-24 10:08               ` Thomas Monjalon
2020-06-24 10:45                 ` Ananyev, Konstantin
2020-06-24 10:39             ` Ananyev, Konstantin
2020-06-24 10:48               ` David Marchand
2020-06-24 11:59                 ` Ananyev, Konstantin
2020-06-26 14:43                   ` David Marchand
2020-06-30 10:35                     ` Thomas Monjalon
2020-06-30 12:07                       ` Ananyev, Konstantin
2020-06-30 12:44                         ` Olivier Matz
2020-06-30 14:37                           ` Thomas Monjalon
2020-06-30 19:02                           ` Ananyev, Konstantin
2020-06-30 14:35                         ` Thomas Monjalon
2020-06-30 18:57                           ` Ananyev, Konstantin
2020-07-01  7:48                             ` David Marchand
2020-07-01 11:58                               ` Ananyev, Konstantin
2020-07-02 13:06                                 ` David Marchand
2020-07-03 15:15                                   ` Thomas Monjalon
2020-07-03 16:40                                   ` Ananyev, Konstantin
2020-07-04 15:00                                     ` David Marchand
2020-07-04 21:24                                       ` Ananyev, Konstantin
2020-06-23 17:02     ` Andrew Rybchenko
2020-06-22 13:25   ` [dpdk-dev] [PATCH v3 7/9] eal: add lcore init callbacks David Marchand
2020-06-22 13:25   ` [dpdk-dev] [PATCH v3 8/9] eal: add lcore iterators David Marchand
2020-06-22 13:25   ` [dpdk-dev] [PATCH v3 9/9] mempool/bucket: handle non-EAL lcores David Marchand
2020-06-23 17:28     ` Andrew Rybchenko
2020-06-26 14:13       ` David Marchand
2020-06-26 14:34         ` Andrew Rybchenko
2020-06-26 14:47 ` [dpdk-dev] [PATCH v4 0/9] Register non-EAL threads as lcore David Marchand
2020-06-26 14:47   ` [dpdk-dev] [PATCH v4 1/9] eal: relocate per thread symbols to common David Marchand
2020-06-30  9:33     ` Olivier Matz
2020-06-26 14:47   ` [dpdk-dev] [PATCH v4 2/9] eal: fix multiple definition of per lcore thread id David Marchand
2020-06-30  9:34     ` Olivier Matz
2020-06-26 14:47   ` [dpdk-dev] [PATCH v4 3/9] eal: introduce thread init helper David Marchand
2020-06-30  9:37     ` Olivier Matz
2020-06-30 12:04       ` David Marchand
2020-06-26 14:47   ` [dpdk-dev] [PATCH v4 4/9] eal: introduce thread uninit helper David Marchand
2020-06-26 15:00     ` Jerin Jacob
2020-06-29  9:07       ` David Marchand
2020-06-29  8:59     ` [dpdk-dev] [EXT] " Sunil Kumar Kori
2020-06-29  9:25       ` David Marchand
2020-06-30  9:42     ` [dpdk-dev] " Olivier Matz
2020-07-01  8:00       ` David Marchand
2020-06-26 14:47   ` [dpdk-dev] [PATCH v4 5/9] eal: move lcore role code David Marchand
2020-06-30  9:45     ` Olivier Matz
2020-06-26 14:47   ` [dpdk-dev] [PATCH v4 6/9] eal: register non-EAL threads as lcores David Marchand
2020-06-29 14:27     ` Ananyev, Konstantin
2020-06-30 10:07     ` Olivier Matz
2020-07-01  7:13       ` David Marchand
2020-07-01  9:11         ` Olivier Matz
2020-06-26 14:47   ` [dpdk-dev] [PATCH v4 7/9] eal: add lcore init callbacks David Marchand
2020-06-29 12:46     ` Ananyev, Konstantin [this message]
2020-06-30 10:09     ` Olivier Matz
2020-06-30 10:15     ` Olivier Matz
2020-06-26 14:47   ` [dpdk-dev] [PATCH v4 8/9] eal: add lcore iterators David Marchand
2020-06-30 10:11     ` Olivier Matz
2020-06-26 14:47   ` [dpdk-dev] [PATCH v4 9/9] mempool/bucket: handle non-EAL lcores David Marchand
2020-06-26 14:52     ` Andrew Rybchenko
2020-07-06 14:15 ` [dpdk-dev] [PATCH v5 00/10] Register non-EAL threads as lcore David Marchand
2020-07-06 14:15   ` [dpdk-dev] [PATCH v5 01/10] eal: relocate per thread symbols to common David Marchand
2020-07-06 14:15   ` [dpdk-dev] [PATCH v5 02/10] eal: fix multiple definition of per lcore thread id David Marchand
2020-07-06 14:15   ` [dpdk-dev] [PATCH v5 03/10] eal: introduce thread init helper David Marchand
2020-07-06 14:16   ` [dpdk-dev] [PATCH v5 04/10] eal: introduce thread uninit helper David Marchand
2020-07-06 14:16   ` [dpdk-dev] [PATCH v5 05/10] eal: move lcore role code David Marchand
2020-07-06 14:16   ` [dpdk-dev] [PATCH v5 06/10] eal: register non-EAL threads as lcores David Marchand
2020-07-06 14:16   ` [dpdk-dev] [PATCH v5 07/10] eal: add lcore init callbacks David Marchand
2020-07-06 14:16   ` [dpdk-dev] [PATCH v5 08/10] eal: add lcore iterators David Marchand
2020-07-06 14:16   ` [dpdk-dev] [PATCH v5 09/10] mempool/bucket: handle non-EAL lcores David Marchand
2020-07-06 14:16   ` [dpdk-dev] [PATCH v5 10/10] eal: add multiprocess disable API David Marchand
2020-07-06 20:52 ` [dpdk-dev] [PATCH v6 00/10] Register non-EAL threads as lcore David Marchand
2020-07-06 20:52   ` [dpdk-dev] [PATCH v6 01/10] eal: relocate per thread symbols to common David Marchand
2020-07-06 20:52   ` [dpdk-dev] [PATCH v6 02/10] eal: fix multiple definition of per lcore thread id David Marchand
2020-07-06 20:52   ` [dpdk-dev] [PATCH v6 03/10] eal: introduce thread init helper David Marchand
2020-07-06 20:52   ` [dpdk-dev] [PATCH v6 04/10] eal: introduce thread uninit helper David Marchand
2020-07-06 20:52   ` [dpdk-dev] [PATCH v6 05/10] eal: move lcore role code David Marchand
2020-07-06 20:52   ` [dpdk-dev] [PATCH v6 06/10] eal: register non-EAL threads as lcores David Marchand
2020-07-06 20:52   ` [dpdk-dev] [PATCH v6 07/10] eal: add lcore init callbacks David Marchand
2020-07-06 20:52   ` [dpdk-dev] [PATCH v6 08/10] eal: add lcore iterators David Marchand
2020-07-06 20:52   ` [dpdk-dev] [PATCH v6 09/10] mempool/bucket: handle non-EAL lcores David Marchand
2020-07-06 20:52   ` [dpdk-dev] [PATCH v6 10/10] eal: add multiprocess disable API David Marchand
2020-07-06 23:22   ` [dpdk-dev] [PATCH v6 00/10] Register non-EAL threads as lcore Ananyev, Konstantin
2020-07-08 13:05     ` David Marchand
2020-07-08 13:06   ` David Marchand

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