On 04/27/2018 03:01 AM, Yongseok Koh wrote:
This patch introduces a new way of attaching an external buffer to a mbuf.Attaching an external buffer is quite similar to mbuf indirection in replacing buffer addresses and length of a mbuf, but a few differences: - When an indirect mbuf is attached, refcnt of the direct mbuf would be 2 as long as the direct mbuf itself isn't freed after the attachment. In such cases, the buffer area of a direct mbuf must be read-only. But external buffer has its own refcnt and it starts from 1. Unless multiple mbufs are attached to a mbuf having an external buffer, the external buffer is writable. - There's no need to allocate buffer from a mempool. Any buffer can be attached with appropriate free callback. - Smaller metadata is required to maintain shared data such as refcnt. Signed-off-by: Yongseok Koh <[email protected]> Acked-by: Konstantin Ananyev <[email protected]> Acked-by: Olivier Matz <[email protected]>
Many thanks, Acked-by: Andrew Rybchenko <[email protected]>
