[LU-17189] GDS is not working on master

• Type: Bug
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.16.0
• Severity: 3
• Assignee: Jinshan Xiong
• Reporter: Jinshan Xiong

Description

GDS on Lustre is not working any more; it's broken by this commit f792297212387c2ff1b1dd6ead1e2d451a375ade around the same time last year.

In particular, this line and similar ones:
```
tx->tx_gpu = msg_md ? (msg_md->md_flags & LNET_MD_FLAG_GPU) : 0;
```
is problematic since `tx_gpu` is a single bit. It will take the last bit of `(msg_md->md_flags & LNET_MD_FLAG_GPU)` in this assignment that will definitely be zero.

I think it's fair to have a dedicated function to do this check. Patch is coming soon