[Qemu-devel] [RFC PATCH RDMA support v4: 07/10] connection-establishment for RDMA

[mrhines@linux.vnet.ibm.com]

From: "Michael R. Hines" <mrhines@us.ibm.com>


Signed-off-by: Michael R. Hines <mrhines@us.ibm.com>
---
 migration-rdma.c |  205 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 205 insertions(+)
 create mode 100644 migration-rdma.c

diff --git a/migration-rdma.c b/migration-rdma.c
new file mode 100644
index 0000000..e1ea055
--- /dev/null
+++ b/migration-rdma.c
@@ -0,0 +1,205 @@
+/*
+ *  Copyright (C) 2013 Michael R. Hines <mrhines@us.ibm.com>
+ *  Copyright (C) 2013 Jiuxing Liu <jl@us.ibm.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; under version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+#include "migration/rdma.h"
+#include "qemu-common.h"
+#include "migration/migration.h"
+#include "migration/qemu-file.h"
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <arpa/inet.h>
+#include <string.h>
+
+//#define DEBUG_MIGRATION_RDMA
+
+#ifdef DEBUG_MIGRATION_RDMA
+#define DPRINTF(fmt, ...) \
+    do { printf("migration-rdma: " fmt, ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) \
+    do { } while (0)
+#endif
+
+static int rdma_accept_incoming_migration(RDMAData *rdma, Error **errp)
+{
+    int ret;
+
+    ret = qemu_rdma_migrate_listen(rdma, rdma->host, rdma->port);
+    if (ret) {
+        qemu_rdma_print("rdma migration: error listening!");
+        goto err_rdma_server_wait;
+    }
+
+    ret = qemu_rdma_alloc_qp(&rdma->rdma_ctx);
+    if (ret) {
+        qemu_rdma_print("rdma migration: error allocating qp!");
+        goto err_rdma_server_wait;
+    }
+
+    ret = qemu_rdma_migrate_accept(&rdma->rdma_ctx, NULL, NULL, NULL, 0);
+    if (ret) {
+        qemu_rdma_print("rdma migration: error accepting connection!");
+        goto err_rdma_server_wait;
+    }
+
+    ret = qemu_rdma_post_recv_qemu_file(rdma);
+    if (ret) {
+        qemu_rdma_print("rdma migration: error posting second qemu file recv!");
+        goto err_rdma_server_wait;
+    }
+
+    ret = qemu_rdma_post_send_remote_info(rdma);
+    if (ret) {
+        qemu_rdma_print("rdma migration: error sending remote info!");
+        goto err_rdma_server_wait;
+    }
+
+    ret = qemu_rdma_wait_for_wrid(rdma, RDMA_WRID_SEND_REMOTE_INFO);
+    if (ret < 0) {
+        qemu_rdma_print("rdma migration: polling remote info error!");
+        goto err_rdma_server_wait;
+    }
+
+    rdma->total_bytes = 0;
+    rdma->enabled = 1;
+    qemu_rdma_dump_gid("server_connect", rdma->rdma_ctx.cm_id);
+    return 0;
+
+err_rdma_server_wait:
+    qemu_rdma_cleanup(rdma);
+    return -1;
+
+}
+
+int rdma_start_incoming_migration(const char * host_port, Error **errp)
+{
+    RDMAData *rdma = g_malloc0(sizeof(RDMAData));
+    QEMUFile *f;
+    int ret;
+
+    if ((ret = qemu_rdma_data_init(rdma, host_port, errp)) < 0)
+        return ret; 
+
+    ret = qemu_rdma_server_init(rdma, NULL);
+
+    DPRINTF("Starting RDMA-based incoming migration\n");
+
+    if (!ret) {
+        DPRINTF("qemu_rdma_server_init success\n");
+        ret = qemu_rdma_server_prepare(rdma, NULL);
+
+        if (!ret) {
+            DPRINTF("qemu_rdma_server_prepare success\n");
+
+            ret = rdma_accept_incoming_migration(rdma, NULL);
+            if(!ret)
+                DPRINTF("qemu_rdma_accept_incoming_migration success\n");
+            f = qemu_fopen_rdma(rdma, "rb");
+            if (f == NULL) {
+                fprintf(stderr, "could not qemu_fopen RDMA\n");
+                ret = -EIO;
+            }
+
+            process_incoming_migration(f);
+        }
+    }
+
+    return ret;
+}
+
+void rdma_start_outgoing_migration(void *opaque, const char *host_port, Error **errp)
+{
+    RDMAData *rdma = g_malloc0(sizeof(RDMAData));
+    MigrationState *s = opaque;
+    int ret;
+
+    if (qemu_rdma_data_init(rdma, host_port, errp) < 0)
+        return; 
+
+    ret = qemu_rdma_client_init(rdma, NULL);
+    if(!ret) {
+        DPRINTF("qemu_rdma_client_init success\n");
+        ret = qemu_rdma_client_connect(rdma, NULL);
+
+        if(!ret) {
+            s->file = qemu_fopen_rdma(rdma, "wb");
+            DPRINTF("qemu_rdma_client_connect success\n");
+            migrate_fd_connect(s);
+            return;
+        }
+    }
+
+    migrate_fd_error(s);
+}
+
+size_t save_rdma_page(QEMUFile *f, ram_addr_t block_offset, ram_addr_t offset, int cont, size_t size)
+{
+    int ret;
+    size_t bytes_sent = 0;
+    ram_addr_t current_addr;
+    RDMAData * rdma = migrate_use_rdma(f);
+
+    current_addr = block_offset + offset;
+
+    /*
+     * Add this page to the current 'chunk'. If the chunk
+     * is full, an actual RDMA write will occur.
+     */
+    if ((ret = qemu_rdma_write(rdma, current_addr, size)) < 0) {
+        fprintf(stderr, "rdma migration: write error! %d\n", ret);
+        return ret;
+    }
+
+    /*
+     * Drain the Completion Queue if possible.
+     * If not, the end of the iteration will do this
+     * again to make sure we don't overflow the
+     * request queue. 
+     */
+    while (1) {
+        int ret = qemu_rdma_poll(rdma);
+        if (ret == RDMA_WRID_NONE) {
+            break;
+        }
+        if (ret < 0) {
+            fprintf(stderr, "rdma migration: polling error! %d\n", ret);
+            return ret;
+        }
+    }
+
+    bytes_sent += size;
+    return bytes_sent;
+}
+
+size_t qemu_rdma_fill(void * opaque, uint8_t *buf, int size)
+{
+    RDMAData * rdma = opaque;
+    size_t len = 0;
+
+    if(rdma->qemu_file_len) {
+        DPRINTF("RDMA %" PRId64 " of %d bytes already in buffer\n",
+	    rdma->qemu_file_len, size);
+
+        len = MIN(size, rdma->qemu_file_len);
+        memcpy(buf, rdma->qemu_file_curr, len);
+        rdma->qemu_file_curr += len;
+        rdma->qemu_file_len -= len;
+    }
+
+    return len;
+}
-- 
1.7.10.4