Re: [PATCH v2] mbuf: add fast free bulk function

[Stephen Hemminger <stephen@networkplumber.org>]

On Tue, 14 Jan 2025 16:39:51 +0000
Morten Brørup <mb@smartsharesystems.com> wrote:

> mbuf: add fast free bulk function
> 
> When putting an mbuf back into its mempool, there are certain requirements
> to the mbuf. Specifically, some of its fields must be initialized.
> 
> These requirements are in fact invariants about free mbufs, held in
> mempools, and thus also apply when allocating an mbuf from a mempool.
> With this in mind, the additional assertions in rte_mbuf_raw_free() were
> moved to __rte_mbuf_raw_sanity_check().
> Furthermore, the assertion regarding pinned external buffer was enhanced;
> it now also asserts that the referenced pinned external buffer has
> refcnt == 1.
> 
> The description of RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE was updated to
> include the remaining requirements, which were missing here.
> 
> And finally:
> A new rte_mbuf_fast_free_bulk() inline function was added for the benefit
> of ethdev drivers supporting fast release of mbufs.
> It asserts these requirements and that the mbufs belong to the specified
> mempool, and then calls rte_mempool_put_bulk().
> 
> Signed-off-by: Morten Brørup <mb@smartsharesystems.com>

Since it is a new function it should be marked experimental for now.