Re: [PATCH v2 1/2] net/mana: fix MR length truncation for chunks over 4GB

On Thu,  6 Aug 2026 20:26:39 +0300
Rita Ruvinsky <[email protected]> wrote:

> mana_range.len is a uint32_t, so a mempool chunk of 4GB or more
> truncates modulo 2^32 -- exactly 4GB becomes 0, 15GB becomes 3GB.
> 
> The guard against priv->max_mr_size cannot catch this because it
> compares the already-truncated value, and the device advertises
> max_mr_size as UINT64_MAX. ibv_reg_mr() then fails with EINVAL on a
> zero length, or silently registers a region far shorter than the pool,
> so lookups for buffers past that boundary never find an MR and no Rx
> WQE can be posted.
> 
> Widen the length to uint64_t through the MR path, including the
> multi-process request that forwards it to the primary process.
> 
> Fixes: 0f5db3c68ba7 ("net/mana: implement memory registration")
> Cc: [email protected]
> Signed-off-by: Rita Ruvinsky <[email protected]>
> Reviewed-by: Long Li <[email protected]>
> ---

Both patches are queued into net-next.
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