Re: [dpdk-dev] [PATCH v7 2/3] test/lpm: add LPM RCU integration functional tests

["Medvedkin, Vladimir" <vladimir.medvedkin@intel.com>]

Hi Ruifeng,

Just a few nits

On 07/07/2020 16:15, Ruifeng Wang wrote:
> Add positive and negative tests for API rte_lpm_rcu_qsbr_add.
> Also test LPM library behavior when RCU QSBR is enabled.
>
> Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
> Reviewed-by: Gavin Hu <gavin.hu@arm.com>
> Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> ---
>   app/test/test_lpm.c | 291 +++++++++++++++++++++++++++++++++++++++++++-
>   1 file changed, 290 insertions(+), 1 deletion(-)
>
> diff --git a/app/test/test_lpm.c b/app/test/test_lpm.c
> index 3a3fd097f..93742e3c7 100644
> --- a/app/test/test_lpm.c
> +++ b/app/test/test_lpm.c
> @@ -8,6 +8,7 @@
>   
>   #include <rte_ip.h>
>   #include <rte_lpm.h>
> +#include <rte_malloc.h>
>   
>   #include "test.h"
>   #include "test_xmmt_ops.h"
> @@ -40,6 +41,9 @@ static int32_t test15(void);
>   static int32_t test16(void);
>   static int32_t test17(void);
>   static int32_t test18(void);
> +static int32_t test19(void);
> +static int32_t test20(void);
> +static int32_t test21(void);
>   
>   rte_lpm_test tests[] = {
>   /* Test Cases */
> @@ -61,7 +65,10 @@ rte_lpm_test tests[] = {
>   	test15,
>   	test16,
>   	test17,
> -	test18
> +	test18,
> +	test19,
> +	test20,
> +	test21
>   };
>   
>   #define MAX_DEPTH 32
> @@ -1265,6 +1272,288 @@ test18(void)
>   	return PASS;
>   }
>   
> +/*
> + * rte_lpm_rcu_qsbr_add positive and negative tests.
> + *  - Add RCU QSBR variable to LPM
> + *  - Add another RCU QSBR variable to LPM
> + *  - Check returns
> + */
> +int32_t
> +test19(void)
> +{
> +	struct rte_lpm *lpm = NULL;
> +	struct rte_lpm_config config;
> +	size_t sz;
> +	struct rte_rcu_qsbr *qsv;
> +	struct rte_rcu_qsbr *qsv2;
> +	int32_t status;
> +	struct rte_lpm_rcu_config rcu_cfg = {0};
> +
> +	config.max_rules = MAX_RULES;
> +	config.number_tbl8s = NUMBER_TBL8S;
> +	config.flags = 0;
> +
> +	lpm = rte_lpm_create(__func__, SOCKET_ID_ANY, &config);
> +	TEST_LPM_ASSERT(lpm != NULL);
> +
> +	/* Create RCU QSBR variable */
> +	sz = rte_rcu_qsbr_get_memsize(RTE_MAX_LCORE);
> +	qsv = (struct rte_rcu_qsbr *)rte_zmalloc_socket(NULL, sz,
> +					RTE_CACHE_LINE_SIZE, SOCKET_ID_ANY);
> +	TEST_LPM_ASSERT(qsv != NULL);
> +
> +	status = rte_rcu_qsbr_init(qsv, RTE_MAX_LCORE);
> +	TEST_LPM_ASSERT(status == 0);
> +
> +	rcu_cfg.v = qsv;
> +	/* Invalid QSBR mode */
> +	rcu_cfg.mode = 2;
> +	status = rte_lpm_rcu_qsbr_add(lpm, &rcu_cfg, NULL);
> +	TEST_LPM_ASSERT(status != 0);
> +
> +	rcu_cfg.mode = RTE_LPM_QSBR_MODE_DQ;
> +	/* Attach RCU QSBR to LPM table */
> +	status = rte_lpm_rcu_qsbr_add(lpm, &rcu_cfg, NULL);
> +	TEST_LPM_ASSERT(status == 0);
> +
> +	/* Create and attach another RCU QSBR to LPM table */
> +	qsv2 = (struct rte_rcu_qsbr *)rte_zmalloc_socket(NULL, sz,
> +					RTE_CACHE_LINE_SIZE, SOCKET_ID_ANY);
> +	TEST_LPM_ASSERT(qsv2 != NULL);
> +
> +	rcu_cfg.v = qsv2;
> +	rcu_cfg.mode = RTE_LPM_QSBR_MODE_SYNC;
> +	status = rte_lpm_rcu_qsbr_add(lpm, &rcu_cfg, NULL);
> +	TEST_LPM_ASSERT(status != 0);
> +
> +	rte_lpm_free(lpm);
> +	rte_free(qsv);
> +	rte_free(qsv2);
> +
> +	return PASS;
> +}
> +
> +/*
> + * rte_lpm_rcu_qsbr_add DQ mode functional test.
> + * Reader and writer are in the same thread in this test.
> + *  - Create LPM which supports 1 tbl8 group at max
> + *  - Add RCU QSBR variable to LPM
> + *  - Add a rule with depth=28 (> 24)
> + *  - Register a reader thread (not a real thread)
> + *  - Reader lookup existing rule
> + *  - Writer delete the rule
> + *  - Reader lookup the rule
> + *  - Writer re-add the rule (no available tbl8 group)
> + *  - Reader report quiescent state and unregister
> + *  - Writer re-add the rule
> + *  - Reader lookup the rule
> + */
> +int32_t
> +test20(void)
> +{
> +	struct rte_lpm *lpm = NULL;
> +	struct rte_lpm_config config;
> +	size_t sz;
> +	struct rte_rcu_qsbr *qsv;
> +	int32_t status;
> +	uint32_t ip, next_hop, next_hop_return;
> +	uint8_t depth;
> +	struct rte_lpm_rcu_config rcu_cfg = {0};
> +
> +	config.max_rules = MAX_RULES;
> +	config.number_tbl8s = 1;
> +	config.flags = 0;
> +
> +	lpm = rte_lpm_create(__func__, SOCKET_ID_ANY, &config);
> +	TEST_LPM_ASSERT(lpm != NULL);
> +
> +	/* Create RCU QSBR variable */
> +	sz = rte_rcu_qsbr_get_memsize(1);
> +	qsv = (struct rte_rcu_qsbr *)rte_zmalloc_socket(NULL, sz,
> +				RTE_CACHE_LINE_SIZE, SOCKET_ID_ANY);
> +	TEST_LPM_ASSERT(qsv != NULL);
> +
> +	status = rte_rcu_qsbr_init(qsv, 1);
> +	TEST_LPM_ASSERT(status == 0);
> +
> +	rcu_cfg.v = qsv;
> +	rcu_cfg.mode = RTE_LPM_QSBR_MODE_DQ;
> +	/* Attach RCU QSBR to LPM table */
> +	status = rte_lpm_rcu_qsbr_add(lpm, &rcu_cfg, NULL);
> +	TEST_LPM_ASSERT(status == 0);
> +
> +	ip = RTE_IPV4(192, 18, 100, 100);


This is a globally routed ip, it looks like you missed "6" in the second 
octet. Here it is better to use the rfc5737 address, rather than rfc1918.


> +	depth = 28;
> +	next_hop = 1;
> +	status = rte_lpm_add(lpm, ip, depth, next_hop);
> +	TEST_LPM_ASSERT(status == 0);
> +	TEST_LPM_ASSERT(lpm->tbl24[ip>>8].valid_group);
> +
> +	/* Register pseudo reader */
> +	status = rte_rcu_qsbr_thread_register(qsv, 0);
> +	TEST_LPM_ASSERT(status == 0);
> +	rte_rcu_qsbr_thread_online(qsv, 0);
> +
> +	status = rte_lpm_lookup(lpm, ip, &next_hop_return);
> +	TEST_LPM_ASSERT(status == 0);
> +	TEST_LPM_ASSERT(next_hop_return == next_hop);
> +
> +	/* Writer update */
> +	status = rte_lpm_delete(lpm, ip, depth);
> +	TEST_LPM_ASSERT(status == 0);
> +	TEST_LPM_ASSERT(!lpm->tbl24[ip>>8].valid);
> +
> +	status = rte_lpm_lookup(lpm, ip, &next_hop_return);
> +	TEST_LPM_ASSERT(status != 0);
> +
> +	status = rte_lpm_add(lpm, ip, depth, next_hop);
> +	TEST_LPM_ASSERT(status != 0);
> +
> +	/* Reader quiescent */
> +	rte_rcu_qsbr_quiescent(qsv, 0);
> +
> +	status = rte_lpm_add(lpm, ip, depth, next_hop);
> +	TEST_LPM_ASSERT(status == 0);
> +
> +	rte_rcu_qsbr_thread_offline(qsv, 0);
> +	status = rte_rcu_qsbr_thread_unregister(qsv, 0);
> +	TEST_LPM_ASSERT(status == 0);
> +
> +	status = rte_lpm_lookup(lpm, ip, &next_hop_return);
> +	TEST_LPM_ASSERT(status == 0);
> +	TEST_LPM_ASSERT(next_hop_return == next_hop);
> +
> +	rte_lpm_free(lpm);
> +	rte_free(qsv);
> +
> +	return PASS;
> +}
> +
> +static struct rte_lpm *g_lpm;
> +static struct rte_rcu_qsbr *g_v;
> +static uint32_t g_ip = RTE_IPV4(192, 18, 100, 100);


Same here as above


> +static volatile uint8_t writer_done;
> +/* Report quiescent state interval every 1024 lookups. Larger critical
> + * sections in reader will result in writer polling multiple times.
> + */
> +#define QSBR_REPORTING_INTERVAL 1024
> +#define WRITER_ITERATIONS	512
> +
> +/*
> + * Reader thread using rte_lpm data structure with RCU.
> + */
> +static int
> +test_lpm_rcu_qsbr_reader(void *arg)
> +{
> +	int i;
> +	uint32_t next_hop_return = 0;
> +
> +	RTE_SET_USED(arg);
> +	/* Register this thread to report quiescent state */
> +	rte_rcu_qsbr_thread_register(g_v, 0);
> +	rte_rcu_qsbr_thread_online(g_v, 0);
> +
> +	do {
> +		for (i = 0; i < QSBR_REPORTING_INTERVAL; i++)
> +			rte_lpm_lookup(g_lpm, g_ip, &next_hop_return);
> +
> +		/* Update quiescent state */
> +		rte_rcu_qsbr_quiescent(g_v, 0);
> +	} while (!writer_done);
> +
> +	rte_rcu_qsbr_thread_offline(g_v, 0);
> +	rte_rcu_qsbr_thread_unregister(g_v, 0);
> +
> +	return 0;
> +}
> +
> +/*
> + * rte_lpm_rcu_qsbr_add sync mode functional test.
> + * 1 Reader and 1 writer. They cannot be in the same thread in this test.
> + *  - Create LPM which supports 1 tbl8 group at max
> + *  - Add RCU QSBR variable with sync mode to LPM
> + *  - Register a reader thread. Reader keeps looking up a specific rule.
> + *  - Writer keeps adding and deleting a specific rule with depth=28 (> 24)
> + */
> +int32_t
> +test21(void)
> +{
> +	struct rte_lpm_config config;
> +	size_t sz;
> +	int32_t status;
> +	uint32_t i, next_hop;
> +	uint8_t depth;
> +	struct rte_lpm_rcu_config rcu_cfg = {0};
> +
> +	if (rte_lcore_count() < 2) {
> +		printf("Not enough cores for %s, expecting at least 2\n",
> +			__func__);
> +		return TEST_SKIPPED;
> +	}
> +
> +	config.max_rules = MAX_RULES;
> +	config.number_tbl8s = 1;
> +	config.flags = 0;
> +
> +	g_lpm = rte_lpm_create(__func__, SOCKET_ID_ANY, &config);
> +	TEST_LPM_ASSERT(g_lpm != NULL);
> +
> +	/* Create RCU QSBR variable */
> +	sz = rte_rcu_qsbr_get_memsize(1);
> +	g_v = (struct rte_rcu_qsbr *)rte_zmalloc_socket(NULL, sz,
> +				RTE_CACHE_LINE_SIZE, SOCKET_ID_ANY);
> +	TEST_LPM_ASSERT(g_v != NULL);
> +
> +	status = rte_rcu_qsbr_init(g_v, 1);
> +	TEST_LPM_ASSERT(status == 0);
> +
> +	rcu_cfg.v = g_v;
> +	rcu_cfg.mode = RTE_LPM_QSBR_MODE_SYNC;
> +	/* Attach RCU QSBR to LPM table */
> +	status = rte_lpm_rcu_qsbr_add(g_lpm, &rcu_cfg, NULL);
> +	TEST_LPM_ASSERT(status == 0);
> +
> +	writer_done = 0;
> +	/* Launch reader thread */
> +	rte_eal_remote_launch(test_lpm_rcu_qsbr_reader, NULL,
> +				rte_get_next_lcore(-1, 1, 0));
> +
> +	depth = 28;
> +	next_hop = 1;
> +	status = rte_lpm_add(g_lpm, g_ip, depth, next_hop);
> +	if (status != 0) {
> +		printf("%s: Failed to add rule\n", __func__);
> +		goto error;
> +	}
> +
> +	/* Writer update */
> +	for (i = 0; i < WRITER_ITERATIONS; i++) {
> +		status = rte_lpm_delete(g_lpm, g_ip, depth);
> +		if (status != 0) {
> +			printf("%s: Failed to delete rule at iteration %d\n",
> +				__func__, i);
> +			goto error;
> +		}
> +
> +		status = rte_lpm_add(g_lpm, g_ip, depth, next_hop);
> +		if (status != 0) {
> +			printf("%s: Failed to add rule at iteration %d\n",
> +				__func__, i);
> +			goto error;
> +		}
> +	}
> +
> +error:
> +	writer_done = 1;
> +	/* Wait until reader exited. */
> +	rte_eal_mp_wait_lcore();
> +
> +	rte_lpm_free(g_lpm);
> +	rte_free(g_v);
> +
> +	return (status == 0) ? PASS : -1;
> +}
> +
>   /*
>    * Do all unit tests.
>    */

Acked-by: Vladimir Medvedkin <vladimir.medvedkin@intel.com>



-- 
Regards,
Vladimir