[dpdk-dev] [PATCH v3 6/9] net/ifc: add devarg for LM mode

[Xiao Wang <xiao.w.wang@intel.com>]

This patch series enables a new method for live migration, i.e. software
assisted live migration. This patch provides a device argument for user
to choose the methold.

When "swlm=1", driver/device will do live migration with a relay thread
dealing with dirty page logging. Without this parameter, device will do
dirty page logging and there's no relay thread consuming CPU resource.

Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
---
 drivers/net/ifc/ifcvf_vdpa.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/ifc/ifcvf_vdpa.c b/drivers/net/ifc/ifcvf_vdpa.c
index c0e50354a..395c5112f 100644
--- a/drivers/net/ifc/ifcvf_vdpa.c
+++ b/drivers/net/ifc/ifcvf_vdpa.c
@@ -8,6 +8,7 @@
 #include <sys/ioctl.h>
 #include <sys/epoll.h>
 #include <linux/virtio_net.h>
+#include <stdbool.h>
 
 #include <rte_malloc.h>
 #include <rte_memory.h>
@@ -31,9 +32,11 @@
 #endif
 
 #define IFCVF_VDPA_MODE		"vdpa"
+#define IFCVF_SW_FALLBACK_LM	"swlm"
 
 static const char * const ifcvf_valid_arguments[] = {
 	IFCVF_VDPA_MODE,
+	IFCVF_SW_FALLBACK_LM,
 	NULL
 };
 
@@ -56,6 +59,7 @@ struct ifcvf_internal {
 	rte_atomic32_t dev_attached;
 	rte_atomic32_t running;
 	rte_spinlock_t lock;
+	bool sw_lm;
 };
 
 struct internal_list {
@@ -767,6 +771,7 @@ ifcvf_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
 	struct ifcvf_internal *internal = NULL;
 	struct internal_list *list = NULL;
 	int vdpa_mode = 0;
+	int sw_fallback_lm = 0;
 	struct rte_kvargs *kvlist = NULL;
 	int ret = 0;
 
@@ -826,6 +831,14 @@ ifcvf_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
 	internal->dev_addr.type = PCI_ADDR;
 	list->internal = internal;
 
+	if (rte_kvargs_count(kvlist, IFCVF_SW_FALLBACK_LM)) {
+		ret = rte_kvargs_process(kvlist, IFCVF_SW_FALLBACK_LM,
+				&open_int, &sw_fallback_lm);
+		if (ret < 0)
+			goto error;
+	}
+	internal->sw_lm = sw_fallback_lm;
+
 	internal->did = rte_vdpa_register_device(&internal->dev_addr,
 				&ifcvf_ops);
 	if (internal->did < 0) {
-- 
2.15.1