[dpdk-dev] [PATCH v11 1/3] i40e: support floating VEB config

[Zhe Tao]

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_floatingVEB=1", and the application will make
sure the PMD will use the floating VEB feature for all the VFs created by
this PF device.

All the VEB/VEPA concepts are not specific for FVL, they are defined in
the 802.1Qbg spec.

But for floating VEB, it has two major difference.
1. doesn't has a up link connection which means
the traffic cannot go to ouside world.
2. doesn't need to connect to the phsical port which means
when the physical link is down the floating VEB can still works
fine.

Signed-off-by: Zhe Tao <zhe.tao at 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 24777d5..8c4ae1c 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -750,6 +750,44 @@ 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_floatingVEB";
+
+	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: enable_floatingVEB=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)
 {
@@ -843,6 +881,12 @@ 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 cfd2399..8297c5f 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;
 
 /**
@@ -450,6 +455,7 @@ 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