[PATCH v13 1/2] 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 applications 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_veb=1", and the application will
tell PMD whether to use the floating VEB feature or not.
Once the floating VEB feature is enabled, all the VFs created by
this PF device are connected to the floating VEB.

All the VEB/VEPA concepts are not specific for FVL, they are defined in
the 802.1Qbg spec. But the floating VEB concept is from i40e data sheet.

The standard VEB definition in 1Qbg is a bridge which has a uplink port
to the outside world (maybe another bridge), but floating means this
special VEB has no uplink port to the outside.

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

Signed-off-by: Zhe Tao <zhe.tao@intel.com>
---
 drivers/net/i40e/i40e_ethdev.c | 160 +++++++++++++++++++++++++++++++++++++++++
 drivers/net/i40e/i40e_ethdev.h |  10 +++
 2 files changed, 170 insertions(+)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 24777d5..553ef56 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -63,6 +63,9 @@
 #include "i40e_pf.h"
 #include "i40e_regs.h"
 
+#define ETH_I40E_FLOATING_VEB_ARG	"enable_floating_veb"
+#define ETH_I40E_FLOATING_VEB_LIST_ARG	"floating_veb_list"
+
 #define I40E_CLEAR_PXE_WAIT_MS     200
 
 /* Maximun number of capability elements */
@@ -751,6 +754,161 @@ i40e_add_tx_flow_control_drop_filter(struct i40e_pf *pf)
 }
 
 static int
+floating_veb_list_handler(__rte_unused const char *key,
+			  const char *floating_veb_value,
+			  void *opaque)
+{
+	int idx = 0;
+	unsigned count = 0;
+	char *end = NULL;
+	int min, max;
+	bool *vf_floating_veb = opaque;
+
+	while (isblank(*floating_veb_value))
+		floating_veb_value++;
+
+	/* Reset floating VEB configuration for VFs */
+	for (idx = 0; idx < I40E_MAX_VF; idx++)
+		vf_floating_veb[idx] = false;
+
+	min = I40E_MAX_VF;
+	do {
+		while (isblank(*floating_veb_value))
+			floating_veb_value++;
+		if (*floating_veb_value == '\0')
+			return -1;
+		errno = 0;
+		idx = strtoul(floating_veb_value, &end, 10);
+		if (errno || end == NULL)
+			return -1;
+		while (isblank(*end))
+			end++;
+		if (*end == '-') {
+			min = idx;
+		} else if ((*end == '/') || (*end == '\0')) {
+			max = idx;
+			if (min == I40E_MAX_VF)
+				min = idx;
+			if (max >= I40E_MAX_VF)
+				max = I40E_MAX_VF - 1;
+			for (idx = min; idx <= max; idx++) {
+				vf_floating_veb[idx] = true;
+				count++;
+			}
+			min = I40E_MAX_VF;
+		} else {
+			return -1;
+		}
+		floating_veb_value = end + 1;
+	} while (*end != '\0');
+
+	if (count == 0)
+		return -1;
+
+	return 0;
+}
+
+static void
+config_vf_floating_veb(struct rte_devargs *devargs,
+		       uint16_t floating_veb,
+		       bool *vf_floating_veb)
+{
+	struct rte_kvargs *kvlist;
+	int i;
+	const char *floating_veb_list = ETH_I40E_FLOATING_VEB_LIST_ARG;
+
+	if (floating_veb == false)
+		return;
+	/* All the VFs attach to the floating VEB by default
+	 * when the floating VEB is enabled.
+	 */
+	for (i = 0; i < I40E_MAX_VF; i++)
+		vf_floating_veb[i] = true;
+
+	if (devargs == NULL)
+		return;
+
+	kvlist = rte_kvargs_parse(devargs->args, NULL);
+	if (kvlist == NULL)
+		return;
+
+	if (!rte_kvargs_count(kvlist, floating_veb_list)) {
+		rte_kvargs_free(kvlist);
+		return;
+	}
+	/* When the floating_veb_list parameter exists, all the VFs
+	 * will attach to the legacy VEB firstly, then configure VFs
+	 * to the floating VEB according to the floating_veb_list.
+	 */
+	if (rte_kvargs_process(kvlist, floating_veb_list,
+			       floating_veb_list_handler,
+			       vf_floating_veb) < 0) {
+		rte_kvargs_free(kvlist);
+		return;
+	}
+	rte_kvargs_free(kvlist);
+}
+
+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
+is_floating_veb_supported(struct rte_devargs *devargs)
+{
+	struct rte_kvargs *kvlist;
+	const char *floating_veb_key = ETH_I40E_FLOATING_VEB_ARG;
+
+	if (devargs == NULL)
+		return 0;
+
+	kvlist = rte_kvargs_parse(devargs->args, NULL);
+	if (kvlist == NULL)
+		return 0;
+
+	if (!rte_kvargs_count(kvlist, floating_veb_key)) {
+		rte_kvargs_free(kvlist);
+		return 0;
+	}
+	/* Floating VEB is enabled when there's key-value:
+	 * enable_floating_veb=1
+	 */
+	if (rte_kvargs_process(kvlist, floating_veb_key,
+			       i40e_check_floating_handler, NULL) < 0) {
+		rte_kvargs_free(kvlist);
+		return 0;
+	}
+	rte_kvargs_free(kvlist);
+
+	return 1;
+}
+
+static void
+config_floating_veb(struct rte_eth_dev *dev)
+{
+	struct rte_pci_device *pci_dev = dev->pci_dev;
+	struct i40e_pf *pf = I40E_DEV_PRIVATE_TO_PF(dev->data->dev_private);
+	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+	memset(pf->floating_veb_list, 0, sizeof(pf->floating_veb_list));
+
+	if (hw->aq.fw_maj_ver >= FLOATING_VEB_SUPPORTED_FW_MAJ) {
+		pf->floating_veb = is_floating_veb_supported(pci_dev->devargs);
+		config_vf_floating_veb(pci_dev->devargs, pf->floating_veb,
+				       pf->floating_veb_list);
+	} else {
+		pf->floating_veb = false;
+	}
+}
+
+static int
 eth_i40e_dev_init(struct rte_eth_dev *dev)
 {
 	struct rte_pci_device *pci_dev;
@@ -843,6 +1001,8 @@ 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 to support floating VEB */
+	config_floating_veb(dev);
 	/* 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..e246eb9 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_VEB_SUPPORTED_FW_MAJ 5
+#define FLOATING_VEB_SUPPORTED_FW_MIN 0
+
 struct i40e_adapter;
 
 /**
@@ -398,6 +403,8 @@ struct i40e_mirror_rule {
 
 TAILQ_HEAD(i40e_mirror_rule_list, i40e_mirror_rule);
 
+#define I40E_MAX_VF		128
+
 /*
  * Structure to store private data specific for PF instance.
  */
@@ -450,6 +457,9 @@ 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 */
+	bool floating_veb; /* The flag to use the floating VEB */
+	/* The floating enable flag for the specific VF */
+	bool floating_veb_list[I40E_MAX_VF];
 };
 
 enum pending_msg {
-- 
2.1.4