[dpdk-dev] [PATCH v3 21/42] event/octeontx2: add devargs to force legacy mode

[pbhagavatula]

From: Pavan Nikhilesh <pbhagavat...@marvell.com>

Octeontx2 SSO by default is set to use dual workslot mode.
Add devargs option to force legacy mode i.e. single workslot mode.
Example:
        --dev "0002:0e:00.0,single_ws=1"

Signed-off-by: Pavan Nikhilesh <pbhagavat...@marvell.com>
---
 doc/guides/eventdevs/octeontx2.rst   |  8 ++++++++
 drivers/event/octeontx2/otx2_evdev.c |  8 +++++++-
 drivers/event/octeontx2/otx2_evdev.h | 11 ++++++++++-
 3 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/doc/guides/eventdevs/octeontx2.rst 
b/doc/guides/eventdevs/octeontx2.rst
index f83cf1e9d..c864f39f9 100644
--- a/doc/guides/eventdevs/octeontx2.rst
+++ b/doc/guides/eventdevs/octeontx2.rst
@@ -58,6 +58,14 @@ Runtime Config Options
 
     --dev "0002:0e:00.0,xae_cnt=16384"
 
+- ``Force legacy mode``
+
+  The ``single_ws`` devargs parameter is introduced to force legacy mode i.e
+  single workslot mode in SSO and disable the default dual workslot mode.
+  For example::
+
+    --dev "0002:0e:00.0,single_ws=1"
+
 Debugging Options
 ~~~~~~~~~~~~~~~~~
 
diff --git a/drivers/event/octeontx2/otx2_evdev.c 
b/drivers/event/octeontx2/otx2_evdev.c
index 16d5e7dfa..5dc39f029 100644
--- a/drivers/event/octeontx2/otx2_evdev.c
+++ b/drivers/event/octeontx2/otx2_evdev.c
@@ -911,11 +911,13 @@ static struct rte_eventdev_ops otx2_sso_ops = {
 };
 
 #define OTX2_SSO_XAE_CNT       "xae_cnt"
+#define OTX2_SSO_SINGLE_WS     "single_ws"
 
 static void
 sso_parse_devargs(struct otx2_sso_evdev *dev, struct rte_devargs *devargs)
 {
        struct rte_kvargs *kvlist;
+       uint8_t single_ws = 0;
 
        if (devargs == NULL)
                return;
@@ -925,7 +927,10 @@ sso_parse_devargs(struct otx2_sso_evdev *dev, struct 
rte_devargs *devargs)
 
        rte_kvargs_process(kvlist, OTX2_SSO_XAE_CNT, &parse_kvargs_value,
                           &dev->xae_cnt);
+       rte_kvargs_process(kvlist, OTX2_SSO_SINGLE_WS, &parse_kvargs_flag,
+                          &single_ws);
 
+       dev->dual_ws = !single_ws;
        rte_kvargs_free(kvlist);
 }
 
@@ -1075,4 +1080,5 @@ otx2_sso_fini(struct rte_eventdev *event_dev)
 RTE_PMD_REGISTER_PCI(event_octeontx2, pci_sso);
 RTE_PMD_REGISTER_PCI_TABLE(event_octeontx2, pci_sso_map);
 RTE_PMD_REGISTER_KMOD_DEP(event_octeontx2, "vfio-pci");
-RTE_PMD_REGISTER_PARAM_STRING(event_octeontx2, OTX2_SSO_XAE_CNT "=<int>");
+RTE_PMD_REGISTER_PARAM_STRING(event_octeontx2, OTX2_SSO_XAE_CNT "=<int>"
+                             OTX2_SSO_SINGLE_WS "=1");
diff --git a/drivers/event/octeontx2/otx2_evdev.h 
b/drivers/event/octeontx2/otx2_evdev.h
index 30b5d2c32..8e614b109 100644
--- a/drivers/event/octeontx2/otx2_evdev.h
+++ b/drivers/event/octeontx2/otx2_evdev.h
@@ -121,8 +121,8 @@ struct otx2_sso_evdev {
        uint64_t nb_xaq_cfg;
        rte_iova_t fc_iova;
        struct rte_mempool *xaq_pool;
-       uint8_t dual_ws;
        /* Dev args */
+       uint8_t dual_ws;
        uint32_t xae_cnt;
        /* HW const */
        uint32_t xae_waes;
@@ -178,6 +178,15 @@ sso_pmd_priv(const struct rte_eventdev *event_dev)
        return event_dev->data->dev_private;
 }
 
+static inline int
+parse_kvargs_flag(const char *key, const char *value, void *opaque)
+{
+       RTE_SET_USED(key);
+
+       *(uint8_t *)opaque = !!atoi(value);
+       return 0;
+}
+
 static inline int
 parse_kvargs_value(const char *key, const char *value, void *opaque)
 {
-- 
2.22.0