Skip to content

README.md: add GCC 16 PF/VF communication open issue #154

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
fionatrahe merged 1 commit into from
May 7, 2026
Merged

README.md: add GCC 16 PF/VF communication open issue #154

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
11 changes: 11 additions & 0 deletions README.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -205,11 +205,22 @@ where: \<Component\> is one of the following:

| Issue ID | Description |
|-------------|------------|
| QAT20-42511 | [GEN - QATlib acceleration services may fail due to broken PF/VF communication when compiling with GCC 16.1](#qat20-42511) |
| QATE-102747 | [GEN - Intel QAT Concurrent Initialization Failure in Standalone Mode](#qate-102747) |
| QATE-102390 | [GEN - [error] validateConcurrRequest() - : Invalid numConcurrRequests](#qate-102390) |
| QATE-3241 | [CY - cpaCySymPerformOp when used with parameter checking may reveal the amount of padding](#qate-3241) |
| QATE-76073 | [GEN - If PF device configuration is modified without restarting qatmgr, undefined behavior may occur](#qate-76073) |

## QAT20-42511
| Title | GEN - QATlib acceleration services may fail due to broken PF/VF communication when compiling with GCC 16.1 |
|----------|:-------------|
| Reference # | QAT20-42511 |
| Description | GCC 16.1 at -O2 may optimize a volatile 32-bit CSR read to a byte access when only one bit is tested. QAT mailbox CSRs require full DWORD transactions; the optimized read causes VF2PF ACK polling to time out, preventing QATlib to retrieve device configuration via PF/VF communication. In this scenario the QATlib process defaults to assuming it's working with an early kernel driver which only supports cryptographic services and fails to start compression or DCC instances. It will start cryptographic instances, but some of the operations may fail unless all QAT PFs are configured with `ServicesEnabled=asym;sym`. |
| Implication | Acceleration services may fail or applications may report no compression instances when built with GCC 16.1. |
| Resolution | Use an earlier version of GCC or if using GCC 16.1 compile with -fno-fuse-ops-with-volatile-access. Use `CFLAGS="-fno-fuse-ops-with-volatile-access" ./configure` |
| Affected OS | Linux |
| Driver/Module | CPM-IA - General |

## QATE-102747
| Title | GEN - Intel QAT Concurrent Initialization Failure in Standalone Mode |
|----------|:-------------|
Expand Down
Loading