[dpdk-dev] [PATCH v6 08/16] cryptodev: define value for unlimited sessions

[Pablo de Lara <pablo.de.lara.guarch@intel.com>]

Currently, the info structure contains the maximum number
of sessions that a device can manage.
This field was useful when the session mempool was created inside
each device, but now it is created at the application level.

Most PMDs do not have a limitation on the sessions managed,
but a few do, therefore this field must remain in the structure.
However, a new value, 0, can be used to indicate that
a device does not have an actual maximum of sessions.

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
Acked-by: Akhil Goyal <akhil.goyal@nxp.com>
---
 app/test-crypto-perf/main.c            | 2 +-
 doc/guides/rel_notes/release_18_08.rst | 2 ++
 examples/ipsec-secgw/ipsec-secgw.c     | 2 +-
 lib/librte_cryptodev/rte_cryptodev.h   | 5 ++++-
 test/test/test_cryptodev.c             | 6 ++++--
 5 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/app/test-crypto-perf/main.c b/app/test-crypto-perf/main.c
index 74e2165a4..2181d0193 100644
--- a/app/test-crypto-perf/main.c
+++ b/app/test-crypto-perf/main.c
@@ -172,7 +172,7 @@ cperf_initialize_cryptodev(struct cperf_options *opts, uint8_t *enabled_cdevs,
 		 * A single session is required per queue pair
 		 * in each device
 		 */
-		if (dev_max_nb_sess < opts->nb_qps) {
+		if (dev_max_nb_sess != 0 && dev_max_nb_sess < opts->nb_qps) {
 			RTE_LOG(ERR, USER1,
 				"Device does not support at least "
 				"%u sessions\n", opts->nb_qps);
diff --git a/doc/guides/rel_notes/release_18_08.rst b/doc/guides/rel_notes/release_18_08.rst
index b5de4dd93..84c2636a6 100644
--- a/doc/guides/rel_notes/release_18_08.rst
+++ b/doc/guides/rel_notes/release_18_08.rst
@@ -62,6 +62,8 @@ API Changes
 
 * cryptodev: In struct ``struct rte_cryptodev_info``, field ``rte_pci_device *pci_dev``
   has been replaced with field ``struct rte_device *device``.
+  Value 0 is accepted in ``sym.max_nb_sessions``, meaning that a device
+  supports an unlimited number of sessions.
 
 * compressdev: Feature flag ``RTE_COMP_FF_MBUF_SCATTER_GATHER`` is
   replaced with the following more explicit flags:
diff --git a/examples/ipsec-secgw/ipsec-secgw.c b/examples/ipsec-secgw/ipsec-secgw.c
index 2582dcb6e..dacf323c9 100644
--- a/examples/ipsec-secgw/ipsec-secgw.c
+++ b/examples/ipsec-secgw/ipsec-secgw.c
@@ -1441,7 +1441,7 @@ cryptodevs_init(void)
 		dev_conf.nb_queue_pairs = qp;
 
 		uint32_t dev_max_sess = cdev_info.sym.max_nb_sessions;
-		if (dev_max_sess < (CDEV_MP_NB_OBJS / 2))
+		if (dev_max_sess != 0 && dev_max_sess < (CDEV_MP_NB_OBJS / 2))
 			rte_exit(EXIT_FAILURE,
 				"Device does not support at least %u "
 				"sessions", CDEV_MP_NB_OBJS / 2);
diff --git a/lib/librte_cryptodev/rte_cryptodev.h b/lib/librte_cryptodev/rte_cryptodev.h
index 114c9fd6e..7989eb876 100644
--- a/lib/librte_cryptodev/rte_cryptodev.h
+++ b/lib/librte_cryptodev/rte_cryptodev.h
@@ -349,7 +349,10 @@ struct rte_cryptodev_info {
 
 	struct {
 		unsigned max_nb_sessions;
-		/**< Maximum number of sessions supported by device. */
+		/**< Maximum number of sessions supported by device.
+		 * If 0, the device does not have any limitation in
+		 * number of sessions that can be used.
+		 */
 	} sym;
 };
 
diff --git a/test/test/test_cryptodev.c b/test/test/test_cryptodev.c
index 0887c05af..877dc1658 100644
--- a/test/test/test_cryptodev.c
+++ b/test/test/test_cryptodev.c
@@ -436,7 +436,8 @@ testsuite_setup(void)
 	 * Create mempool with maximum number of sessions * 2,
 	 * to include the session headers
 	 */
-	if (info.sym.max_nb_sessions < MAX_NB_SESSIONS) {
+	if (info.sym.max_nb_sessions != 0 &&
+			info.sym.max_nb_sessions < MAX_NB_SESSIONS) {
 		RTE_LOG(ERR, USER1, "Device does not support "
 				"at least %u sessions\n",
 				MAX_NB_SESSIONS);
@@ -8546,7 +8547,8 @@ test_scheduler_attach_slave_op(void)
 		unsigned int session_size =
 			rte_cryptodev_sym_get_private_session_size(i);
 
-		if (info.sym.max_nb_sessions < MAX_NB_SESSIONS) {
+		if (info.sym.max_nb_sessions != 0 &&
+				info.sym.max_nb_sessions < MAX_NB_SESSIONS) {
 			RTE_LOG(ERR, USER1,
 					"Device does not support "
 					"at least %u sessions\n",
-- 
2.14.4