linux-kernel - Re: [PATCH net-next v2 0/4] add frag page support in page pool

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Date:   Tue, 10 Aug 2021 16:23:52 +0200
From:   Jesper Dangaard Brouer <jbrouer@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        Yunsheng Lin <linyunsheng@...wei.com>
Cc:     brouer@...hat.com, davem@...emloft.net, alexander.duyck@...il.com,
        linux@...linux.org.uk, mw@...ihalf.com, linuxarm@...neuler.org,
        yisen.zhuang@...wei.com, salil.mehta@...wei.com,
        thomas.petazzoni@...tlin.com, hawk@...nel.org,
        ilias.apalodimas@...aro.org, ast@...nel.org, daniel@...earbox.net,
        john.fastabend@...il.com, akpm@...ux-foundation.org,
        peterz@...radead.org, will@...nel.org, willy@...radead.org,
        vbabka@...e.cz, fenghua.yu@...el.com, guro@...com,
        peterx@...hat.com, feng.tang@...el.com, jgg@...pe.ca,
        mcroce@...rosoft.com, hughd@...gle.com, jonathan.lemon@...il.com,
        alobakin@...me, willemb@...gle.com, wenxu@...oud.cn,
        cong.wang@...edance.com, haokexin@...il.com, nogikh@...gle.com,
        elver@...gle.com, yhs@...com, kpsingh@...nel.org,
        andrii@...nel.org, kafai@...com, songliubraving@...com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, chenhao288@...ilicon.com,
        Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH net-next v2 0/4] add frag page support in page pool



On 10/08/2021 16.01, Jakub Kicinski wrote:
> On Fri, 6 Aug 2021 10:46:18 +0800 Yunsheng Lin wrote:
>> enable skb's page frag recycling based on page pool in
>> hns3 drvier.
> 
> Applied, thanks!

I had hoped to see more acks / reviewed-by before this got applied.
E.g. from MM-people as this patchset changes struct page and page_pool 
(that I'm marked as maintainer of).  And I would have appreciated an 
reviewed-by credit to/from Alexander as he did a lot of work in the RFC 
patchset for the split-page tricks.

p.s. I just returned from vacation today, and have not had time to 
review, sorry.

--Jesper

(relevant struct page changes for MM-people to review)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 52bbd2b..7f8ee09 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -103,11 +103,19 @@ struct page {
  			unsigned long pp_magic;
  			struct page_pool *pp;
  			unsigned long _pp_mapping_pad;
-			/**
-			 * @dma_addr: might require a 64-bit value on
-			 * 32-bit architectures.
-			 */
-			unsigned long dma_addr[2];
+			unsigned long dma_addr;
+			union {
+				/**
+				 * dma_addr_upper: might require a 64-bit
+				 * value on 32-bit architectures.
+				 */
+				unsigned long dma_addr_upper;
+				/**
+				 * For frag page support, not supported in
+				 * 32-bit architectures with 64-bit DMA.
+				 */
+				atomic_long_t pp_frag_count;
+			};
  		};
  		struct {	/* slab, slob and slub */