Re: [Intel-wired-lan] [PATCH iwl-net] idpf: cap maximum Rx buffer size

[David Decotigny via Intel-wired-lan <intel-wired-lan@osuosl.org>]

On 11/3/2025 1:20 PM, Joshua Hay wrote:
> The HW only supports a maximum Rx buffer size of 16K-128. On systems
> using large pages, the libeth logic can configure the buffer size to be
> larger than this. The upper bound is PAGE_SIZE while the lower bound is
> MTU rounded up to the nearest power of 2. For example, ARM systems with
> a 64K page size and an mtu of 9000 will set the Rx buffer size to 16K,
> which will cause the config Rx queues message to fail.
> 
> Initialize the bufq/fill queue buf_len field to the maximum supported
> size. This will trigger the libeth logic to cap the maximum Rx buffer
> size by reducing the upper bound.
> 
> Fixes: 74d1412ac8f37 ("idpf: use libeth Rx buffer management for payload buffer")
> Signed-off-by: Joshua Hay <joshua.a.hay@intel.com>
> Acked-by: Alexander Lobakin <aleksander.lobakin@intel.com>
> Reviewed-by: Madhu Chittim <madhu.chittim@intel.com>
> ---

Reviewed-by: David Decotigny <ddecotig@google.com>