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Message-Id:
<172806903625.2708740.7897093517925120680.git-patchwork-notify@kernel.org>
Date: Fri, 04 Oct 2024 19:10:36 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Nick Child <nnac123@...ux.ibm.com>
Cc: netdev@...r.kernel.org, horms@...nel.org, haren@...ux.ibm.com,
ricklind@...ibm.com
Subject: Re: [PATCH net v2 0/1] ibmvnic: Fix for send scrq direct
Hello:
This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@...nel.org>:
On Tue, 1 Oct 2024 11:31:59 -0500 you wrote:
> This is a v2 of a patchset (now just patch) which addresses a
> bug in a new feature which is causing major link UP issues with
> certain physical cards.
>
> For a full summary of the issue:
> 1. During vnic initialization we get the following values from vnic
> server regarding "Transmit / Receive Descriptor Requirement" (see
> PAPR Table 584. CAPABILITIES Commands):
> - LSO Tx frame = 0x0F , header offsets + L2, L3, L4 headers required
> - CSO Tx frame = 0x0C , header offsets + L2 header required
> - standard frame = 0x0C , header offsets + L2 header required
> 2. Assume we are dealing with only "standard frames" from now on (no
> CSO, no LSO)
> 3. When using 100G backing device, we don't hand vnic server any header
> information and TX is successful
> 4. When using 25G backing device, we don't hand vnic server any header
> information and TX fails and we get "Adapter Error" transport events.
> The obvious issue here is that vnic client should be respecting the 0X0C
> header requirement for standard frames. But 100G cards will also give
> 0x0C despite the fact that we know TX works if we ignore it. That being
> said, we still must respect values given from the managing server. Will
> need to work with them going forward to hopefully get 100G cards to
> return 0x00 for this bitstring so the performance gains of using
> send_subcrq_direct can be continued.
>
> [...]
Here is the summary with links:
- [net,v2,1/1] ibmvnic: Inspect header requirements before using scrq direct
https://git.kernel.org/netdev/net/c/de390657b5d6
You are awesome, thank you!
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