migration: convert rdma backend to accept MigrateAddress

RDMA based transport backend for 'migrate'/'migrate-incoming' QAPIs
accept new wire protocol of MigrateAddress struct.

It is achived by parsing 'uri' string and storing migration parameters
required for RDMA connection into well defined InetSocketAddress struct.

Suggested-by: Aravind Retnakaran <aravind.retnakaran@nutanix.com>
Signed-off-by: Het Gala <het.gala@nutanix.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231023182053.8711-7-farosas@suse.de>

migration/migration.c

@@ -534,7 +534,7 @@ static void qemu_start_incoming_migration(const char *uri, Error **errp)
             fd_start_incoming_migration(saddr->u.fd.str, errp);
         }
 #ifdef CONFIG_RDMA
-    } else if (strstart(uri, "rdma:", &p)) {
+    } else if (channel->transport == MIGRATION_ADDRESS_TYPE_RDMA) {
         if (migrate_compress()) {
             error_setg(errp, "RDMA and compression can't be used together");
             return;
@@ -547,7 +547,7 @@ static void qemu_start_incoming_migration(const char *uri, Error **errp)
             error_setg(errp, "RDMA and multifd can't be used together");
             return;
         }
-        rdma_start_incoming_migration(p, errp);
+        rdma_start_incoming_migration(&channel->u.rdma, errp);
 #endif
     } else if (strstart(uri, "exec:", &p)) {
         exec_start_incoming_migration(p, errp);
@@ -1935,8 +1935,8 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
             fd_start_outgoing_migration(s, saddr->u.fd.str, &local_err);
         }
 #ifdef CONFIG_RDMA
-    } else if (strstart(uri, "rdma:", &p)) {
+    } else if (channel->transport == MIGRATION_ADDRESS_TYPE_RDMA) {
-        rdma_start_outgoing_migration(s, p, &local_err);
+        rdma_start_outgoing_migration(s, &channel->u.rdma, &local_err);
 #endif
     } else if (strstart(uri, "exec:", &p)) {
         exec_start_outgoing_migration(s, p, &local_err);

migration/rdma.c

@@ -289,7 +289,6 @@ typedef struct RDMALocalBlocks {
 typedef struct RDMAContext {
     char *host;
     int port;
-    char *host_port;
 
     RDMAWorkRequestData wr_data[RDMA_WRID_MAX];
 
@@ -2431,9 +2430,7 @@ static void qemu_rdma_cleanup(RDMAContext *rdma)
         rdma->channel = NULL;
     }
     g_free(rdma->host);
-    g_free(rdma->host_port);
     rdma->host = NULL;
-    rdma->host_port = NULL;
 }
 
 
@@ -2723,28 +2720,16 @@ static void qemu_rdma_return_path_dest_init(RDMAContext *rdma_return_path,
     rdma_return_path->is_return_path = true;
 }
 
-static RDMAContext *qemu_rdma_data_init(const char *host_port, Error **errp)
+static RDMAContext *qemu_rdma_data_init(InetSocketAddress *saddr, Error **errp)
 {
     RDMAContext *rdma = NULL;
-    InetSocketAddress *addr;
 
     rdma = g_new0(RDMAContext, 1);
     rdma->current_index = -1;
     rdma->current_chunk = -1;
 
-    addr = g_new(InetSocketAddress, 1);
+    rdma->host = g_strdup(saddr->host);
-    if (!inet_parse(addr, host_port, NULL)) {
+    rdma->port = atoi(saddr->port);
-        rdma->port = atoi(addr->port);
-        rdma->host = g_strdup(addr->host);
-        rdma->host_port = g_strdup(host_port);
-    } else {
-        error_setg(errp, "RDMA ERROR: bad RDMA migration address '%s'",
-                   host_port);
-        g_free(rdma);
-        rdma = NULL;
-    }
-
-    qapi_free_InetSocketAddress(addr);
     return rdma;
 }
 
@@ -3353,6 +3338,7 @@ static int qemu_rdma_accept(RDMAContext *rdma)
                                             .private_data_len = sizeof(cap),
                                          };
     RDMAContext *rdma_return_path = NULL;
+    g_autoptr(InetSocketAddress) isock = g_new0(InetSocketAddress, 1);
     struct rdma_cm_event *cm_event;
     struct ibv_context *verbs;
     int ret;
@@ -3367,13 +3353,16 @@ static int qemu_rdma_accept(RDMAContext *rdma)
         goto err_rdma_dest_wait;
     }
 
+    isock->host = rdma->host;
+    isock->port = g_strdup_printf("%d", rdma->port);
+
     /*
      * initialize the RDMAContext for return path for postcopy after first
      * connection request reached.
      */
     if ((migrate_postcopy() || migrate_return_path())
         && !rdma->is_return_path) {
-        rdma_return_path = qemu_rdma_data_init(rdma->host_port, NULL);
+        rdma_return_path = qemu_rdma_data_init(isock, NULL);
         if (rdma_return_path == NULL) {
             rdma_ack_cm_event(cm_event);
             goto err_rdma_dest_wait;
@@ -4074,7 +4063,8 @@ static void rdma_accept_incoming_migration(void *opaque)
     }
 }
 
-void rdma_start_incoming_migration(const char *host_port, Error **errp)
+void rdma_start_incoming_migration(InetSocketAddress *host_port,
+                                   Error **errp)
 {
     MigrationState *s = migrate_get_current();
     int ret;
@@ -4118,13 +4108,12 @@ cleanup_rdma:
 err:
     if (rdma) {
         g_free(rdma->host);
-        g_free(rdma->host_port);
     }
     g_free(rdma);
 }
 
 void rdma_start_outgoing_migration(void *opaque,
-                            const char *host_port, Error **errp)
+                            InetSocketAddress *host_port, Error **errp)
 {
     MigrationState *s = opaque;
     RDMAContext *rdma_return_path = NULL;

migration/rdma.h

@@ -14,15 +14,17 @@
  *
  */
 
+#include "qemu/sockets.h"
+
 #ifndef QEMU_MIGRATION_RDMA_H
 #define QEMU_MIGRATION_RDMA_H
 
 #include "exec/memory.h"
 
-void rdma_start_outgoing_migration(void *opaque, const char *host_port,
+void rdma_start_outgoing_migration(void *opaque, InetSocketAddress *host_port,
                                    Error **errp);
 
-void rdma_start_incoming_migration(const char *host_port, Error **errp);
+void rdma_start_incoming_migration(InetSocketAddress *host_port, Error **errp);
 
 /*
  * Constants used by rdma return codes