multifd: Split multifd code into its own file

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

migration/Makefile.objs

@@ -7,6 +7,7 @@ common-obj-y += qemu-file-channel.o
 common-obj-y += xbzrle.o postcopy-ram.o
 common-obj-y += qjson.o
 common-obj-y += block-dirty-bitmap.o
+common-obj-y += multifd.o
 
 common-obj-$(CONFIG_RDMA) += rdma.o
 

migration/migration.c

@@ -53,6 +53,7 @@
 #include "monitor/monitor.h"
 #include "net/announce.h"
 #include "qemu/queue.h"
+#include "multifd.h"
 
 #define MAX_THROTTLE  (32 << 20)      /* Migration transfer speed throttling */
 

migration/multifd.h

@@ -0,0 +1,139 @@
+/*
+ * Multifd common functions
+ *
+ * Copyright (c) 2019-2020 Red Hat Inc
+ *
+ * Authors:
+ *  Juan Quintela <quintela@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef QEMU_MIGRATION_MULTIFD_H
+#define QEMU_MIGRATION_MULTIFD_H
+
+int multifd_save_setup(Error **errp);
+void multifd_save_cleanup(void);
+int multifd_load_setup(Error **errp);
+int multifd_load_cleanup(Error **errp);
+bool multifd_recv_all_channels_created(void);
+bool multifd_recv_new_channel(QIOChannel *ioc, Error **errp);
+void multifd_recv_sync_main(void);
+void multifd_send_sync_main(QEMUFile *f);
+int multifd_queue_page(QEMUFile *f, RAMBlock *block, ram_addr_t offset);
+
+#define MULTIFD_FLAG_SYNC (1 << 0)
+
+/* This value needs to be a multiple of qemu_target_page_size() */
+#define MULTIFD_PACKET_SIZE (512 * 1024)
+
+typedef struct {
+    uint32_t magic;
+    uint32_t version;
+    uint32_t flags;
+    /* maximum number of allocated pages */
+    uint32_t pages_alloc;
+    uint32_t pages_used;
+    /* size of the next packet that contains pages */
+    uint32_t next_packet_size;
+    uint64_t packet_num;
+    uint64_t unused[4];    /* Reserved for future use */
+    char ramblock[256];
+    uint64_t offset[];
+} __attribute__((packed)) MultiFDPacket_t;
+
+typedef struct {
+    /* number of used pages */
+    uint32_t used;
+    /* number of allocated pages */
+    uint32_t allocated;
+    /* global number of generated multifd packets */
+    uint64_t packet_num;
+    /* offset of each page */
+    ram_addr_t *offset;
+    /* pointer to each page */
+    struct iovec *iov;
+    RAMBlock *block;
+} MultiFDPages_t;
+
+typedef struct {
+    /* this fields are not changed once the thread is created */
+    /* channel number */
+    uint8_t id;
+    /* channel thread name */
+    char *name;
+    /* channel thread id */
+    QemuThread thread;
+    /* communication channel */
+    QIOChannel *c;
+    /* sem where to wait for more work */
+    QemuSemaphore sem;
+    /* this mutex protects the following parameters */
+    QemuMutex mutex;
+    /* is this channel thread running */
+    bool running;
+    /* should this thread finish */
+    bool quit;
+    /* thread has work to do */
+    int pending_job;
+    /* array of pages to sent */
+    MultiFDPages_t *pages;
+    /* packet allocated len */
+    uint32_t packet_len;
+    /* pointer to the packet */
+    MultiFDPacket_t *packet;
+    /* multifd flags for each packet */
+    uint32_t flags;
+    /* size of the next packet that contains pages */
+    uint32_t next_packet_size;
+    /* global number of generated multifd packets */
+    uint64_t packet_num;
+    /* thread local variables */
+    /* packets sent through this channel */
+    uint64_t num_packets;
+    /* pages sent through this channel */
+    uint64_t num_pages;
+    /* syncs main thread and channels */
+    QemuSemaphore sem_sync;
+}  MultiFDSendParams;
+
+typedef struct {
+    /* this fields are not changed once the thread is created */
+    /* channel number */
+    uint8_t id;
+    /* channel thread name */
+    char *name;
+    /* channel thread id */
+    QemuThread thread;
+    /* communication channel */
+    QIOChannel *c;
+    /* this mutex protects the following parameters */
+    QemuMutex mutex;
+    /* is this channel thread running */
+    bool running;
+    /* should this thread finish */
+    bool quit;
+    /* array of pages to receive */
+    MultiFDPages_t *pages;
+    /* packet allocated len */
+    uint32_t packet_len;
+    /* pointer to the packet */
+    MultiFDPacket_t *packet;
+    /* multifd flags for each packet */
+    uint32_t flags;
+    /* global number of generated multifd packets */
+    uint64_t packet_num;
+    /* thread local variables */
+    /* size of the next packet that contains pages */
+    uint32_t next_packet_size;
+    /* packets sent through this channel */
+    uint64_t num_packets;
+    /* pages sent through this channel */
+    uint64_t num_pages;
+    /* syncs main thread and channels */
+    QemuSemaphore sem_sync;
+} MultiFDRecvParams;
+
+#endif
+

migration/ram.h

@@ -41,13 +41,6 @@ int xbzrle_cache_resize(int64_t new_size, Error **errp);
 uint64_t ram_bytes_remaining(void);
 uint64_t ram_bytes_total(void);
 
-int multifd_save_setup(Error **errp);
-void multifd_save_cleanup(void);
-int multifd_load_setup(Error **errp);
-int multifd_load_cleanup(Error **errp);
-bool multifd_recv_all_channels_created(void);
-bool multifd_recv_new_channel(QIOChannel *ioc, Error **errp);
-
 uint64_t ram_pagesize_summary(void);
 int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len);
 void acct_update_position(QEMUFile *f, size_t size, bool zero);