[dpdk-dev] [PATCH 25/36] event/cnxk: add devargs for chunk size and rings

[pbhagavatula at marvell.com]

From: Shijith Thotton <sthotton at marvell.com>

Add devargs to control default chunk size and max numbers of
timer rings to attach to a given RVU PF.

Example:
	--dev "0002:1e:00.0,tim_chnk_slots=1024"
	--dev "0002:1e:00.0,tim_rings_lmt=4"

Signed-off-by: Pavan Nikhilesh <pbhagavatula at marvell.com>
Signed-off-by: Shijith Thotton <sthotton at marvell.com>
---
 doc/guides/eventdevs/cnxk.rst       | 23 +++++++++++++++++++++++
 drivers/event/cnxk/cn10k_eventdev.c |  4 +++-
 drivers/event/cnxk/cn9k_eventdev.c  |  4 +++-
 drivers/event/cnxk/cnxk_tim_evdev.c | 14 +++++++++++++-
 drivers/event/cnxk/cnxk_tim_evdev.h |  4 ++++
 5 files changed, 46 insertions(+), 3 deletions(-)

diff --git a/doc/guides/eventdevs/cnxk.rst b/doc/guides/eventdevs/cnxk.rst
index 9e14f99f2..05dcf06f4 100644
--- a/doc/guides/eventdevs/cnxk.rst
+++ b/doc/guides/eventdevs/cnxk.rst
@@ -103,6 +103,29 @@ Runtime Config Options
 
     -a 0002:0e:00.0,tim_disable_npa=1
 
+- ``TIM modify chunk slots``
+
+  The ``tim_chnk_slots`` devargs can be used to modify number of chunk slots.
+  Chunks are used to store event timers, a chunk can be visualised as an array
+  where the last element points to the next chunk and rest of them are used to
+  store events. TIM traverses the list of chunks and enqueues the event timers
+  to SSO. The default value is 255 and the max value is 4095.
+
+  For example::
+
+    -a 0002:0e:00.0,tim_chnk_slots=1023
+
+- ``TIM limit max rings reserved``
+
+  The ``tim_rings_lmt`` devargs can be used to limit the max number of TIM
+  rings i.e. event timer adapter reserved on probe. Since, TIM rings are HW
+  resources we can avoid starving other applications by not grabbing all the
+  rings.
+
+  For example::
+
+    -a 0002:0e:00.0,tim_rings_lmt=5
+
 Debugging Options
 -----------------
 
diff --git a/drivers/event/cnxk/cn10k_eventdev.c b/drivers/event/cnxk/cn10k_eventdev.c
index 807e666d3..a5a614196 100644
--- a/drivers/event/cnxk/cn10k_eventdev.c
+++ b/drivers/event/cnxk/cn10k_eventdev.c
@@ -503,4 +503,6 @@ RTE_PMD_REGISTER_KMOD_DEP(event_cn10k, "vfio-pci");
 RTE_PMD_REGISTER_PARAM_STRING(event_cn10k, CNXK_SSO_XAE_CNT "=<int>"
 			      CNXK_SSO_GGRP_QOS "=<string>"
 			      CN10K_SSO_GW_MODE "=<int>"
-			      CNXK_TIM_DISABLE_NPA "=1");
+			      CNXK_TIM_DISABLE_NPA "=1"
+			      CNXK_TIM_CHNK_SLOTS "=<int>"
+			      CNXK_TIM_RINGS_LMT "=<int>");
diff --git a/drivers/event/cnxk/cn9k_eventdev.c b/drivers/event/cnxk/cn9k_eventdev.c
index 3e27fce4a..cfea3723a 100644
--- a/drivers/event/cnxk/cn9k_eventdev.c
+++ b/drivers/event/cnxk/cn9k_eventdev.c
@@ -572,4 +572,6 @@ RTE_PMD_REGISTER_KMOD_DEP(event_cn9k, "vfio-pci");
 RTE_PMD_REGISTER_PARAM_STRING(event_cn9k, CNXK_SSO_XAE_CNT "=<int>"
 			      CNXK_SSO_GGRP_QOS "=<string>"
 			      CN9K_SSO_SINGLE_WS "=1"
-			      CNXK_TIM_DISABLE_NPA "=1");
+			      CNXK_TIM_DISABLE_NPA "=1"
+			      CNXK_TIM_CHNK_SLOTS "=<int>"
+			      CNXK_TIM_RINGS_LMT "=<int>");
diff --git a/drivers/event/cnxk/cnxk_tim_evdev.c b/drivers/event/cnxk/cnxk_tim_evdev.c
index 6bbfadb25..07ec57fd2 100644
--- a/drivers/event/cnxk/cnxk_tim_evdev.c
+++ b/drivers/event/cnxk/cnxk_tim_evdev.c
@@ -253,6 +253,10 @@ cnxk_tim_parse_devargs(struct rte_devargs *devargs, struct cnxk_tim_evdev *dev)
 
 	rte_kvargs_process(kvlist, CNXK_TIM_DISABLE_NPA, &parse_kvargs_flag,
 			   &dev->disable_npa);
+	rte_kvargs_process(kvlist, CNXK_TIM_CHNK_SLOTS, &parse_kvargs_value,
+			   &dev->chunk_slots);
+	rte_kvargs_process(kvlist, CNXK_TIM_RINGS_LMT, &parse_kvargs_value,
+			   &dev->min_ring_cnt);
 
 	rte_kvargs_free(kvlist);
 }
@@ -278,6 +282,7 @@ cnxk_tim_init(struct roc_sso *sso)
 	cnxk_tim_parse_devargs(sso->pci_dev->device.devargs, dev);
 
 	dev->tim.roc_sso = sso;
+	dev->tim.nb_lfs = dev->min_ring_cnt;
 	rc = roc_tim_init(&dev->tim);
 	if (rc < 0) {
 		plt_err("Failed to initialize roc tim resources");
@@ -285,7 +290,14 @@ cnxk_tim_init(struct roc_sso *sso)
 		return;
 	}
 	dev->nb_rings = rc;
-	dev->chunk_sz = CNXK_TIM_RING_DEF_CHUNK_SZ;
+
+	if (dev->chunk_slots && dev->chunk_slots <= CNXK_TIM_MAX_CHUNK_SLOTS &&
+	    dev->chunk_slots >= CNXK_TIM_MIN_CHUNK_SLOTS) {
+		dev->chunk_sz =
+			(dev->chunk_slots + 1) * CNXK_TIM_CHUNK_ALIGNMENT;
+	} else {
+		dev->chunk_sz = CNXK_TIM_RING_DEF_CHUNK_SZ;
+	}
 }
 
 void
diff --git a/drivers/event/cnxk/cnxk_tim_evdev.h b/drivers/event/cnxk/cnxk_tim_evdev.h
index 8c21ab1fe..6208c150a 100644
--- a/drivers/event/cnxk/cnxk_tim_evdev.h
+++ b/drivers/event/cnxk/cnxk_tim_evdev.h
@@ -34,6 +34,8 @@
 #define CN9K_TIM_MIN_TMO_TKS (256)
 
 #define CNXK_TIM_DISABLE_NPA "tim_disable_npa"
+#define CNXK_TIM_CHNK_SLOTS  "tim_chnk_slots"
+#define CNXK_TIM_RINGS_LMT   "tim_rings_lmt"
 
 struct cnxk_tim_evdev {
 	struct roc_tim tim;
@@ -42,6 +44,8 @@ struct cnxk_tim_evdev {
 	uint32_t chunk_sz;
 	/* Dev args */
 	uint8_t disable_npa;
+	uint16_t chunk_slots;
+	uint16_t min_ring_cnt;
 };
 
 enum cnxk_tim_clk_src {
-- 
2.17.1