[dpdk-stable] [PATCH v2] net/enic: re-enable link status change interrupt

[Hyong Youb Kim <hyonkim@cisco.com>]

When INTx is used, the interrupt handler needs to explicitly re-enable
interrupt in order to receive another one in future. The LSC interrupt
handler currently does not, and the link state never gets updated when
INTx is used (e.g. uio_pci_generic). Call rte_intr_ack() at the end of
the handler, to re-enable INTx.

Fixes: fefed3d1e62c ("enic: new driver")
Cc: stable@dpdk.org

Signed-off-by: Hyong Youb Kim <hyonkim@cisco.com>
Reviewed-by: John Daley <johndale@cisco.com>
---
v2: spell out experimental APIs used

 drivers/net/enic/Makefile    | 2 ++
 drivers/net/enic/enic_main.c | 2 ++
 drivers/net/enic/meson.build | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/drivers/net/enic/Makefile b/drivers/net/enic/Makefile
index 10736a567..4e0c83da5 100644
--- a/drivers/net/enic/Makefile
+++ b/drivers/net/enic/Makefile
@@ -13,6 +13,8 @@ EXPORT_MAP := rte_pmd_enic_version.map
 
 LIBABIVER := 1
 
+# Experimental APIs used: rte_intr_ack
+CFLAGS += -DALLOW_EXPERIMENTAL_API
 CFLAGS += -I$(SRCDIR)/base/
 CFLAGS += -I$(SRCDIR)
 CFLAGS += -O3
diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index f5b9b0dcb..57574a5f7 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -448,6 +448,8 @@ enic_intr_handler(void *arg)
 	enic_link_update(dev);
 	_rte_eth_dev_callback_process(dev, RTE_ETH_EVENT_INTR_LSC, NULL);
 	enic_log_q_error(enic);
+	/* Re-enable irq in case of INTx */
+	rte_intr_ack(&enic->pdev->intr_handle);
 }
 
 static int enic_rxq_intr_init(struct enic *enic)
diff --git a/drivers/net/enic/meson.build b/drivers/net/enic/meson.build
index 1bd7cc7e1..e5eeb5667 100644
--- a/drivers/net/enic/meson.build
+++ b/drivers/net/enic/meson.build
@@ -1,6 +1,8 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2018 Cisco Systems, Inc.
 
+# Experimental APIs used: rte_intr_ack
+cflags += ['-DALLOW_EXPERIMENTAL_API']
 sources = files(
 	'base/vnic_cq.c',
 	'base/vnic_dev.c',
-- 
2.22.0