On Thu, Jan 22, 2026 at 06:07:45PM -0800, Jakub Kicinski wrote:

On Thu, 22 Jan 2026 09:43:42 -0800 Erni Sri Satya Vennela wrote:

quoted

On Wed, Jan 21, 2026 at 08:14:12PM -0800, Jakub Kicinski wrote:

quoted

On Tue, 20 Jan 2026 22:56:55 -0800 Erni Sri Satya Vennela wrote:  

quoted

Enhance MANA driver logging to provide better visibility into
hardware configuration and error states during driver initialization
and runtime operations.  

quoted

+	dev_info(gc->dev, "Max Resources: msix_usable=%u max_queues=%u\n",
+		 gc->num_msix_usable, gc->max_num_queues);  

quoted

+	dev_info(dev, "Device Config: max_vports=%u adapter_mtu=%u bm_hostmode=%u\n",
+		 *max_num_vports, gc->adapter_mtu, *bm_hostmode);  

IIUC in networking we try to follow the mantra that if the system is
functioning correctly there should be no logs. You can expose the debug
info via ethtool, devlink, debugfs etc. Take your pick.  

We discussed this internally and noted that customers often cannot
reliably reproduce the VM issue. In such cases, the only evidence
available is the dmesg logs captured during the incident. Asking them to
re-enable debug options later is not practical, since the problem may
not occur again. Similarly, exposing the information via ethtool,
devlink, or debugfs is less effective because the data is transient and
lost after a reboot. As these messages are printed only once during
initialization, and not repeated during runtime or driver load/unload,
we decided to keep them at info level to aid troubleshooting without
adding noise.

You will have to build proper support tooling like every single vendor
before you. Presumably you can also log from the hypervisor side which
makes your life so much easier than supporting real HW. Yet, real
NIC don't spew random trash to the logs all the time. SMH. Respectfully,
next time y'all "discuss things internally" start with the question of
what makes your case special :|

+100

Interesting. Completely independent of your comment, I provided the same
feedback on their mana_ib driver. They added debug logs to nearly every
command, even though those commands already had existing debug logging.

https://lore.kernel.org/linux-rdma/20260122131442.GL13201@unreal/T/#m51e8a12f4bca4a6c1377c5531c8a6d94a43af1e5 (local)

"In order to simplify things for you: unless you can clearly justify why this
print is required and why you cannot proceed without it, I must ask you to stop
adding any new debug or error messages to the mana_ib driver. There is a wide
range of existing tools and well‑established practices for debugging the kernel,
and none of them require spamming dmesg."

Thanks