[PATCH v15 01/20] net: Introduce direct data placement tcp offload

[David Ahern]

On 9/12/23 3:59 AM, Aurelien Aptel wrote:
> As a result, data from page frags should not be copied out to
> the linear part. To avoid needless copies, such as when using
> skb_condense, we mark the skb->ulp_ddp bit.

Not consolidating frags into linear is a requirement for any Rx ZC
solution (e.g., the gpu devmem RFC set and accompanying io_uring set for
userspace memory). Meaning, the bit can be more generic and less tied to
ulp_ddp.