Re: [Qemu-devel] [PATCH 2/2] rdma: simplify qemu_rdma_register_and_get_keys()

[Juan Quintela]

Isaku Yamahata <address@hidden> wrote:
> Signed-off-by: Isaku Yamahata <address@hidden>

I don't understand this bit:

> +        uint8_t *chunk_start = ram_chunk_start(block, chunk);
> +        uint8_t *chunk_end = ram_chunk_end(block, chunk);

Here we are getting just the length of a chunk


>      sge.length = length;
>  
>      chunk = ram_chunk_index(block->local_host_addr, (uint8_t *) sge.addr);
> -    chunk_start = ram_chunk_start(block, chunk);
>  
>      if (block->is_ram_block) {
>          chunks = length / (1UL << RDMA_REG_CHUNK_SHIFT);
> @@ -1884,8 +1883,6 @@ retry:
>      DDPRINTF("Writing %" PRIu64 " chunks, (%" PRIu64 " MB)\n",
>          chunks + 1, (chunks + 1) * (1UL << RDMA_REG_CHUNK_SHIFT) / 1024 / 
> 1024);
>  
> -    chunk_end = ram_chunk_end(block, chunk + chunks);
> -

But here chuck_end was the length of a list of chucks.


> @@ -3076,11 +3069,9 @@ static int qemu_rdma_registration_handle(QEMUFile *f, 
> void *opaque,
>                      host_addr = block->local_host_addr +
>                          (reg->key.chunk * (1UL << RDMA_REG_CHUNK_SHIFT));
>                  }
> -                chunk_start = ram_chunk_start(block, chunk);
> -                chunk_end = ram_chunk_end(block, chunk + reg->chunks);
>                  if (qemu_rdma_register_and_get_keys(rdma, block,
>                              (uint8_t *)host_addr, NULL, &reg_result->rkey,
> -                            chunk, chunk_start, chunk_end)) {
> +                            chunk)) {

Same here.


I am missing something obvious?

PD.  No, I don't claim to understand RDMA.