[dpdk-dev] [PATCH 1/2 v6] i40e: support floating VEB config

[Zhe Tao <zhe.tao@intel.com>]

Add the new floating related argument option in the devarg.
Using this parameter, all the samples can decide whether to use legacy VEB/VEPA
or floating VEB.
To enable this feature, the user should pass a devargs parameter to the EAL
like "-w 84:00.0,enable_floating=1", and the application will make sure the PMD
will use the floating VEB feature for all the VFs created by this PF device.

Signed-off-by: Zhe Tao <zhe.tao@intel.com>
---
 drivers/net/i40e/i40e_ethdev.c | 44 ++++++++++++++++++++++++++++++++++++++++++
 drivers/net/i40e/i40e_ethdev.h |  6 ++++++
 2 files changed, 50 insertions(+)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 6fdae57..01f1d3d 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -739,6 +739,44 @@ i40e_add_tx_flow_control_drop_filter(struct i40e_pf *pf)
 				  " frames from VSIs.");
 }
 
+static int i40e_check_floating_handler(__rte_unused const char *key,
+				       const char *value,
+				       __rte_unused void *opaque)
+{
+	if (strcmp(value, "1"))
+		return -1;
+
+	return 0;
+}
+
+static int
+i40e_check_floating(struct rte_devargs *devargs)
+{
+	struct rte_kvargs *kvlist;
+	const char *floating_key = "enable_floating";
+
+	if (devargs == NULL)
+		return 0;
+
+	kvlist = rte_kvargs_parse(devargs->args, NULL);
+	if (kvlist == NULL)
+		return 0;
+
+	if (!rte_kvargs_count(kvlist, floating_key)) {
+		rte_kvargs_free(kvlist);
+		return 0;
+	}
+	/* Floating is enabled when there's key-value pair: enable_floating=1 */
+	if (rte_kvargs_process(kvlist, floating_key,
+			       i40e_check_floating_handler, NULL) < 0) {
+		rte_kvargs_free(kvlist);
+		return 0;
+	}
+	rte_kvargs_free(kvlist);
+
+	return 1;
+}
+
 static int
 eth_i40e_dev_init(struct rte_eth_dev *dev)
 {
@@ -829,6 +867,12 @@ eth_i40e_dev_init(struct rte_eth_dev *dev)
 		     ((hw->nvm.version >> 4) & 0xff),
 		     (hw->nvm.version & 0xf), hw->nvm.eetrack);
 
+	/* Need the special FW version support floating VEB */
+	if (hw->aq.fw_maj_ver >= FLOATING_FW_MAJ) {
+		pf->floating = i40e_check_floating(pci_dev->devargs);
+	} else {
+		pf->floating = false;
+	}
 	/* Clear PXE mode */
 	i40e_clear_pxe_mode(hw);
 
diff --git a/drivers/net/i40e/i40e_ethdev.h b/drivers/net/i40e/i40e_ethdev.h
index 1c75672..7dc6936 100644
--- a/drivers/net/i40e/i40e_ethdev.h
+++ b/drivers/net/i40e/i40e_ethdev.h
@@ -36,6 +36,7 @@
 
 #include <rte_eth_ctrl.h>
 #include <rte_time.h>
+#include <rte_kvargs.h>
 
 #define I40E_VLAN_TAG_SIZE        4
 
@@ -171,6 +172,10 @@ enum i40e_flxpld_layer_idx {
 #define I40E_QUEUE_ITR_INTERVAL_DEFAULT 32 /* 32 us */
 #define I40E_QUEUE_ITR_INTERVAL_MAX     8160 /* 8160 us */
 
+/* Special FW support this floating VEB feature */
+#define FLOATING_FW_MAJ 5
+#define FLOATING_FW_MIN 0
+
 struct i40e_adapter;
 
 /**
@@ -446,6 +451,7 @@ struct i40e_pf {
 	struct i40e_fc_conf fc_conf; /* Flow control conf */
 	struct i40e_mirror_rule_list mirror_list;
 	uint16_t nb_mirror_rule;   /* The number of mirror rules */
+	uint16_t floating; /* The flag to use the floating VEB */
 };
 
 enum pending_msg {
-- 
2.1.4