netdev - Re: [PATCH net-next RESEND v4] ibmvnic: Increase max subcrq indirect entries with fallback

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Message-Id: 
 <175619460575.3698989.15196706539067195769.git-patchwork-notify@kernel.org>
Date: Tue, 26 Aug 2025 07:50:05 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Mingming Cao <mmc@...ux.ibm.com>
Cc: netdev@...r.kernel.org, horms@...nel.org, bjking1@...ux.ibm.com,
 haren@...ux.ibm.com, ricklind@...ux.ibm.com, kuba@...nel.org,
 edumazet@...gle.com, pabeni@...hat.com, linuxppc-dev@...ts.ozlabs.org,
 maddy@...ux.ibm.com, mpe@...erman.id.au
Subject: Re: [PATCH net-next RESEND v4] ibmvnic: Increase max subcrq indirect
 entries with fallback

Hello:

This patch was applied to netdev/net-next.git (main)
by Paolo Abeni <pabeni@...hat.com>:

On Thu, 21 Aug 2025 06:02:15 -0700 you wrote:
> POWER8 support a maximum of 16 subcrq indirect descriptor entries per
>  H_SEND_SUB_CRQ_INDIRECT call, while POWER9 and newer hypervisors
>  support up to 128 entries. Increasing the max number of indirect
> descriptor entries improves batching efficiency and reduces
> hcall overhead, which enhances throughput under large workload on POWER9+.
> 
> Currently, ibmvnic driver always uses a fixed number of max indirect
> descriptor entries (16). send_subcrq_indirect() treats all hypervisor
> errors the same:
>  - Cleanup and Drop the entire batch of descriptors.
>  - Return an error to the caller.
>  - Rely on TCP/IP retransmissions to recover.
>  - If the hypervisor returns H_PARAMETER (e.g., because 128
>    entries are not supported on POWER8), the driver will continue
>    to drop batches, resulting in unnecessary packet loss.
> 
> [...]

Here is the summary with links:
  - [net-next,RESEND,v4] ibmvnic: Increase max subcrq indirect entries with fallback
    https://git.kernel.org/netdev/net-next/c/3c14917953a5

You are awesome, thank you!
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