[PATCH v3 6/6] net/tap: add flow control management

[Pascal Mazon <pascal.mazon@6wind.com>]

A tap netdevice does not support flow control; ensure nothing but
RTE_FC_NONE mode can be set.

Signed-off-by: Pascal Mazon <pascal.mazon@6wind.com>
---
 doc/guides/nics/features/tap.ini |  1 +
 drivers/net/tap/rte_eth_tap.c    | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/doc/guides/nics/features/tap.ini b/doc/guides/nics/features/tap.ini
index 7f3f4d661dd7..a51712dce066 100644
--- a/doc/guides/nics/features/tap.ini
+++ b/doc/guides/nics/features/tap.ini
@@ -14,6 +14,7 @@ Multicast MAC filter = Y
 Speed capabilities   = Y
 Unicast MAC filter   = Y
 Packet type parsing  = Y
+Flow control         = Y
 Other kdrv           = Y
 ARMv7                = Y
 ARMv8                = Y
diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index edb5d2a82f12..cbfb3b9641c8 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -783,6 +783,23 @@ tap_dev_supported_ptypes_get(struct rte_eth_dev *dev __rte_unused)
 	return ptypes;
 }
 
+static int
+tap_flow_ctrl_get(struct rte_eth_dev *dev __rte_unused,
+		  struct rte_eth_fc_conf *fc_conf)
+{
+	fc_conf->mode = RTE_FC_NONE;
+	return 0;
+}
+
+static int
+tap_flow_ctrl_set(struct rte_eth_dev *dev __rte_unused,
+		  struct rte_eth_fc_conf *fc_conf)
+{
+	if (fc_conf->mode != RTE_FC_NONE)
+		return -ENOTSUP;
+	return 0;
+}
+
 static const struct eth_dev_ops ops = {
 	.dev_start              = tap_dev_start,
 	.dev_stop               = tap_dev_stop,
@@ -793,6 +810,8 @@ static const struct eth_dev_ops ops = {
 	.tx_queue_setup         = tap_tx_queue_setup,
 	.rx_queue_release       = tap_rx_queue_release,
 	.tx_queue_release       = tap_tx_queue_release,
+	.flow_ctrl_get          = tap_flow_ctrl_get,
+	.flow_ctrl_set          = tap_flow_ctrl_set,
 	.link_update            = tap_link_update,
 	.dev_set_link_up        = tap_link_set_up,
 	.dev_set_link_down      = tap_link_set_down,
-- 
2.8.0.rc0