[dpdk-dev] [PATCH v4] net/ice: add flow mark hint support

[Qi Zhang <qi.z.zhang@intel.com>]

Since not all data paths support flow mark, the driver needs
a hint from application to select the correct data path if
flow mark is required. The patch introduces a devarg
"flow-mark-support" as a workaround solution, since a standard
way is still ongoing.

Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Qiming Yang <qiming.yang@intel.com>
---

v4:
- remove debug code, fix typos

v3:
- add "experimental notification" in ice.rst

v2:
- fix typos

 doc/guides/nics/ice.rst               | 12 ++++++++++++
 drivers/net/ice/ice_ethdev.c          | 12 +++++++++++-
 drivers/net/ice/ice_ethdev.h          |  1 +
 drivers/net/ice/ice_rxtx_vec_common.h |  6 ++++++
 4 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/doc/guides/nics/ice.rst b/doc/guides/nics/ice.rst
index 7ff33d7f0..652620d16 100644
--- a/doc/guides/nics/ice.rst
+++ b/doc/guides/nics/ice.rst
@@ -98,6 +98,18 @@ Runtime Config Options
 
     -w 80:00.0,pipeline-mode-support=1
 
+- ``Flow Mark Support`` (default ``0``)
+
+  This is a hint to the driver to select the data path that supports flow mark extraction
+  by default.
+  NOTE: This is an experimental devarg, it will be removed when any of below conditions
+  is ready.
+  1) all data paths support flow mark (currently vPMD does not)
+  2) a new offload like RTE_DEV_RX_OFFLOAD_FLOW_MARK be introduced as a standard way to hint.
+  Example::
+
+    -w 80:00.0,flow-mark-support=1
+
 - ``Protocol extraction for per queue``
 
   Configure the RX queues to do protocol extraction into mbuf for protocol
diff --git a/drivers/net/ice/ice_ethdev.c b/drivers/net/ice/ice_ethdev.c
index ecfc6c9e8..de189daba 100644
--- a/drivers/net/ice/ice_ethdev.c
+++ b/drivers/net/ice/ice_ethdev.c
@@ -23,11 +23,13 @@
 /* devargs */
 #define ICE_SAFE_MODE_SUPPORT_ARG "safe-mode-support"
 #define ICE_PIPELINE_MODE_SUPPORT_ARG  "pipeline-mode-support"
+#define ICE_FLOW_MARK_SUPPORT_ARG	"flow-mark-support"
 #define ICE_PROTO_XTR_ARG         "proto_xtr"
 
 static const char * const ice_valid_args[] = {
 	ICE_SAFE_MODE_SUPPORT_ARG,
 	ICE_PIPELINE_MODE_SUPPORT_ARG,
+	ICE_FLOW_MARK_SUPPORT_ARG,
 	ICE_PROTO_XTR_ARG,
 	NULL
 };
@@ -1987,6 +1989,13 @@ static int ice_parse_devargs(struct rte_eth_dev *dev)
 
 	ret = rte_kvargs_process(kvlist, ICE_PIPELINE_MODE_SUPPORT_ARG,
 				 &parse_bool, &ad->devargs.pipe_mode_support);
+	if (ret)
+		goto bail;
+
+	ret = rte_kvargs_process(kvlist, ICE_FLOW_MARK_SUPPORT_ARG,
+				 &parse_bool, &ad->devargs.flow_mark_support);
+	if (ret)
+		goto bail;
 
 bail:
 	rte_kvargs_free(kvlist);
@@ -4562,7 +4571,8 @@ RTE_PMD_REGISTER_KMOD_DEP(net_ice, "* igb_uio | uio_pci_generic | vfio-pci");
 RTE_PMD_REGISTER_PARAM_STRING(net_ice,
 			      ICE_PROTO_XTR_ARG "=[queue:]<vlan|ipv4|ipv6|ipv6_flow|tcp>"
 			      ICE_SAFE_MODE_SUPPORT_ARG "=<0|1>"
-			      ICE_PIPELINE_MODE_SUPPORT_ARG "=<0|1>");
+			      ICE_PIPELINE_MODE_SUPPORT_ARG "=<0|1>"
+			      ICE_FLOW_MARK_SUPPORT_ARG "=<0|1>");
 
 RTE_INIT(ice_init_log)
 {
diff --git a/drivers/net/ice/ice_ethdev.h b/drivers/net/ice/ice_ethdev.h
index 510f6869d..f2186e1ff 100644
--- a/drivers/net/ice/ice_ethdev.h
+++ b/drivers/net/ice/ice_ethdev.h
@@ -391,6 +391,7 @@ struct ice_devargs {
 	int safe_mode_support;
 	uint8_t proto_xtr_dflt;
 	int pipe_mode_support;
+	int flow_mark_support;
 	uint8_t proto_xtr[ICE_MAX_QUEUE_NUM];
 };
 
diff --git a/drivers/net/ice/ice_rxtx_vec_common.h b/drivers/net/ice/ice_rxtx_vec_common.h
index 080ca4175..5e6f89642 100644
--- a/drivers/net/ice/ice_rxtx_vec_common.h
+++ b/drivers/net/ice/ice_rxtx_vec_common.h
@@ -268,6 +268,12 @@ ice_rx_vec_dev_check_default(struct rte_eth_dev *dev)
 {
 	int i;
 	struct ice_rx_queue *rxq;
+	struct ice_adapter *ad =
+		ICE_DEV_PRIVATE_TO_ADAPTER(dev->data->dev_private);
+
+	/* vPMD does not support flow mark. */
+	if (ad->devargs.flow_mark_support)
+		return -1;
 
 	for (i = 0; i < dev->data->nb_rx_queues; i++) {
 		rxq = dev->data->rx_queues[i];
-- 
2.13.6