net/ifc: add LM mode parameter

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 "sw-live-migration=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>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

diff --git a/drivers/net/ifc/ifcvf_vdpa.c b/drivers/net/ifc/ifcvf_vdpa.c
index c0e5035..2f73d3c 100644 (file)
--- 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   "sw-live-migration"
 
 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) {