Re: [PATCH v3] net/af_packet: add multi-segment mbuf support for jumbo frames

Stephen Hemminger
2026-03-12T16:35:02Z

On Thu, 12 Mar 2026 08:34:03 +0100
Sriram Yagnaraman <sriram.yagnaraman@ericsson.com> wrote:

> Enable jumbo frame reception with default mbuf data room size by
> chaining multiple mbufs when packet exceeds single mbuf tailroom.
>
> Scatter Rx is only enabled when RTE_ETH_RX_OFFLOAD_SCATTER is
> requested. Packets are dropped if they exceed single mbuf size
> and scatter is not enabled, or if mbuf allocation fails during
> chaining. Error counter rx_dropped_pkts tracks all drops.
>
> This allows receiving 9KB jumbo frames using standard 2KB mbufs,
> chaining ~5 segments per jumbo packet.
> ---

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