### What this PR does / why we need it?
https://github.com/vllm-project/vllm/pull/35122 This PR in the vllm
community refactors the update mode of block_size. As a result, when the
user does not specify `--block-size`, dsv3.2 obtains an incorrect
block_size.
**The root cause of the problem is analyzed from the block_size update
process as follows:**
1. In NPUPlatform, `check_and_update_config` calls `refresh_block_size`
to set block_size to 128.
2. During Modelrunner initialization, the `self.block_size` parameter is
generated. At this time, block_size is still 128. This parameter will be
used for operations such as kvcache initialization.
3. `update_block_size_for_backend` updates block_size to the size set in
attn_backend. The reason why the DSV3.2 is faulty is that it has an
additional attn_backend `DeepseekV32IndexerBackend`, and this backend is
not rewritten. The block_size obtained from attn_backend is 64. In this
case, only `vllm_config.cache_config.block_size` is updated, and other
parts are not modified. As a result, the block_size on the entire
network is inconsistent.
**Modification solution:**
Skip `update_block_size_for_backend` and modify block_size only in the
`check_and_update_config` method.
In the future, the block_size update logic can be migrated to the
`update_block_size_for_backend` method. Ensure that all block_size
values on the entire network are updated.
### Does this PR introduce _any_ user-facing change?
no
### How was this patch tested?
- vLLM version: v0.18.0
- vLLM main:
ed359c497a
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### What this PR does / why we need it?
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Signed-off-by: Wang Kunpeng <1289706727@qq.com>
0bab629f90