On 8/2/2023 11:07 AM, Haiyang Zhang wrote:
> Add page pool for RX buffers for faster buffer cycle and reduce CPU
> usage.
>
> The standard page pool API is used.
>
> Signed-off-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
> ---
> V5:
> In err path, set page_pool_put_full_page(..., false) as suggested by
> Jakub Kicinski
> V4:
> Add nid setting, remove page_pool_nid_changed(), as suggested by
> Jesper Dangaard Brouer
> V3:
> Update xdp mem model, pool param, alloc as suggested by Jakub Kicinski
> V2:
> Use the standard page pool API as suggested by Jesper Dangaard Brouer
> ---
> diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h
> index 024ad8ddb27e..b12859511839 100644
> --- a/include/net/mana/mana.h
> +++ b/include/net/mana/mana.h
> @@ -280,6 +280,7 @@ struct mana_recv_buf_oob {
> struct gdma_wqe_request wqe_req;
>
> void *buf_va;
> + bool from_pool; /* allocated from a page pool */
suggest you use flags and not bools, as bools waste 7 bits each, plus
your packing of this struct will be full of holes, made worse by this
patch. (see pahole tool)
>
> /* SGL of the buffer going to be sent has part of the work request. */
> u32 num_sge;
> @@ -330,6 +331,8 @@ struct mana_rxq {
> bool xdp_flush;
> int xdp_rc; /* XDP redirect return code */
>
> + struct page_pool *page_pool;
> +
> /* MUST BE THE LAST MEMBER:
> * Each receive buffer has an associated mana_recv_buf_oob.
> */
The rest of the patch looks ok and is remarkably compact for a
conversion to page pool. I'd prefer someone with more page pool exposure
review this for correctness, but FWIW
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@xxxxxxxxx>
