net/enic: re-enable link status change interrupt

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>

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

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)

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',