[Qemu-devel] [PATCH 01/10] Rename RDMA structures to make destination clear

["Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>]

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

RDMA has two data types that are named confusingly;
   RDMALocalBlock (pointed to indirectly by local_ram_blocks)
   RDMARemoteBlock (pointed to by block in RDMAContext)

RDMALocalBlocks, as the name suggests is a data strucuture that
represents the RDMAable RAM Blocks on the current side of the migration
whichever that is.

RDMARemoteBlocks is always the shape of the RAMBlocks on the
destination, even on the destination.

Rename:
     RDMARemoteBlock -> RDMADestBlock
     context->'block' -> context->dest_blocks

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 migration/rdma.c | 66 ++++++++++++++++++++++++++++----------------------------
 1 file changed, 33 insertions(+), 33 deletions(-)

diff --git a/migration/rdma.c b/migration/rdma.c
index 77e3444..089adcf 100644
--- a/migration/rdma.c
+++ b/migration/rdma.c
@@ -236,13 +236,13 @@ typedef struct RDMALocalBlock {
  * corresponding RDMALocalBlock with
  * the information needed to perform the actual RDMA.
  */
-typedef struct QEMU_PACKED RDMARemoteBlock {
+typedef struct QEMU_PACKED RDMADestBlock {
     uint64_t remote_host_addr;
     uint64_t offset;
     uint64_t length;
     uint32_t remote_rkey;
     uint32_t padding;
-} RDMARemoteBlock;
+} RDMADestBlock;
 
 static uint64_t htonll(uint64_t v)
 {
@@ -258,20 +258,20 @@ static uint64_t ntohll(uint64_t v) {
     return ((uint64_t)ntohl(u.lv[0]) << 32) | (uint64_t) ntohl(u.lv[1]);
 }
 
-static void remote_block_to_network(RDMARemoteBlock *rb)
+static void dest_block_to_network(RDMADestBlock *db)
 {
-    rb->remote_host_addr = htonll(rb->remote_host_addr);
-    rb->offset = htonll(rb->offset);
-    rb->length = htonll(rb->length);
-    rb->remote_rkey = htonl(rb->remote_rkey);
+    db->remote_host_addr = htonll(db->remote_host_addr);
+    db->offset = htonll(db->offset);
+    db->length = htonll(db->length);
+    db->remote_rkey = htonl(db->remote_rkey);
 }
 
-static void network_to_remote_block(RDMARemoteBlock *rb)
+static void network_to_dest_block(RDMADestBlock *db)
 {
-    rb->remote_host_addr = ntohll(rb->remote_host_addr);
-    rb->offset = ntohll(rb->offset);
-    rb->length = ntohll(rb->length);
-    rb->remote_rkey = ntohl(rb->remote_rkey);
+    db->remote_host_addr = ntohll(db->remote_host_addr);
+    db->offset = ntohll(db->offset);
+    db->length = ntohll(db->length);
+    db->remote_rkey = ntohl(db->remote_rkey);
 }
 
 /*
@@ -350,7 +350,7 @@ typedef struct RDMAContext {
      * Description of ram blocks used throughout the code.
      */
     RDMALocalBlocks local_ram_blocks;
-    RDMARemoteBlock *block;
+    RDMADestBlock  *dest_blocks;
 
     /*
      * Migration on *destination* started.
@@ -590,7 +590,7 @@ static int qemu_rdma_init_ram_blocks(RDMAContext *rdma)
     memset(local, 0, sizeof *local);
     qemu_ram_foreach_block(qemu_rdma_init_one_block, rdma);
     trace_qemu_rdma_init_ram_blocks(local->nb_blocks);
-    rdma->block = (RDMARemoteBlock *) g_malloc0(sizeof(RDMARemoteBlock) *
+    rdma->dest_blocks = (RDMADestBlock *) g_malloc0(sizeof(RDMADestBlock) *
                         rdma->local_ram_blocks.nb_blocks);
     local->init = true;
     return 0;
@@ -2177,8 +2177,8 @@ static void qemu_rdma_cleanup(RDMAContext *rdma)
         rdma->connected = false;
     }
 
-    g_free(rdma->block);
-    rdma->block = NULL;
+    g_free(rdma->dest_blocks);
+    rdma->dest_blocks = NULL;
 
     for (idx = 0; idx < RDMA_WRID_MAX; idx++) {
         if (rdma->wr_data[idx].control_mr) {
@@ -2967,25 +2967,25 @@ static int qemu_rdma_registration_handle(QEMUFile *f, void *opaque,
              * their "local" descriptions with what was sent.
              */
             for (i = 0; i < local->nb_blocks; i++) {
-                rdma->block[i].remote_host_addr =
+                rdma->dest_blocks[i].remote_host_addr =
                     (uintptr_t)(local->block[i].local_host_addr);
 
                 if (rdma->pin_all) {
-                    rdma->block[i].remote_rkey = local->block[i].mr->rkey;
+                    rdma->dest_blocks[i].remote_rkey = local->block[i].mr->rkey;
                 }
 
-                rdma->block[i].offset = local->block[i].offset;
-                rdma->block[i].length = local->block[i].length;
+                rdma->dest_blocks[i].offset = local->block[i].offset;
+                rdma->dest_blocks[i].length = local->block[i].length;
 
-                remote_block_to_network(&rdma->block[i]);
+                dest_block_to_network(&rdma->dest_blocks[i]);
             }
 
             blocks.len = rdma->local_ram_blocks.nb_blocks
-                                                * sizeof(RDMARemoteBlock);
+                                                * sizeof(RDMADestBlock);
 
 
             ret = qemu_rdma_post_send_control(rdma,
-                                        (uint8_t *) rdma->block, &blocks);
+                                        (uint8_t *) rdma->dest_blocks, &blocks);
 
             if (ret < 0) {
                 error_report("rdma migration: error sending remote info");
@@ -3141,7 +3141,7 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque,
     if (flags == RAM_CONTROL_SETUP) {
         RDMAControlHeader resp = {.type = RDMA_CONTROL_RAM_BLOCKS_RESULT };
         RDMALocalBlocks *local = &rdma->local_ram_blocks;
-        int reg_result_idx, i, j, nb_remote_blocks;
+        int reg_result_idx, i, j, nb_dest_blocks;
 
         head.type = RDMA_CONTROL_RAM_BLOCKS_REQUEST;
         trace_qemu_rdma_registration_stop_ram();
@@ -3162,7 +3162,7 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque,
             return ret;
         }
 
-        nb_remote_blocks = resp.len / sizeof(RDMARemoteBlock);
+        nb_dest_blocks = resp.len / sizeof(RDMADestBlock);
 
         /*
          * The protocol uses two different sets of rkeys (mutually exclusive):
@@ -3176,7 +3176,7 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque,
          * and then propagates the remote ram block descriptions to his local copy.
          */
 
-        if (local->nb_blocks != nb_remote_blocks) {
+        if (local->nb_blocks != nb_dest_blocks) {
             ERROR(errp, "ram blocks mismatch #1! "
                         "Your QEMU command line parameters are probably "
                         "not identical on both the source and destination.");
@@ -3184,26 +3184,26 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque,
         }
 
         qemu_rdma_move_header(rdma, reg_result_idx, &resp);
-        memcpy(rdma->block,
+        memcpy(rdma->dest_blocks,
             rdma->wr_data[reg_result_idx].control_curr, resp.len);
-        for (i = 0; i < nb_remote_blocks; i++) {
-            network_to_remote_block(&rdma->block[i]);
+        for (i = 0; i < nb_dest_blocks; i++) {
+            network_to_dest_block(&rdma->dest_blocks[i]);
 
             /* search local ram blocks */
             for (j = 0; j < local->nb_blocks; j++) {
-                if (rdma->block[i].offset != local->block[j].offset) {
+                if (rdma->dest_blocks[i].offset != local->block[j].offset) {
                     continue;
                 }
 
-                if (rdma->block[i].length != local->block[j].length) {
+                if (rdma->dest_blocks[i].length != local->block[j].length) {
                     ERROR(errp, "ram blocks mismatch #2! "
                         "Your QEMU command line parameters are probably "
                         "not identical on both the source and destination.");
                     return -EINVAL;
                 }
                 local->block[j].remote_host_addr =
-                        rdma->block[i].remote_host_addr;
-                local->block[j].remote_rkey = rdma->block[i].remote_rkey;
+                        rdma->dest_blocks[i].remote_host_addr;
+                local->block[j].remote_rkey = rdma->dest_blocks[i].remote_rkey;
                 break;
             }
 
-- 
2.3.5