linux-kernel - [PATCH net-next v2 2/2] net: remove __skb_frag_set

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Date:   Thu, 11 May 2023 09:12:13 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Yunsheng Lin <linyunsheng@...wei.com>,
        Leon Romanovsky <leonro@...dia.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Simon Horman <simon.horman@...igine.com>,
        Rasesh Mody <rmody@...vell.com>,
        <GR-Linux-NIC-Dev@...vell.com>, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next v2 2/2] net: remove __skb_frag_set_page()

The remaining users calling __skb_frag_set_page() with
page being NULL seems to be doing defensive programming,
as shinfo->nr_frags is already decremented, so remove
them.

Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>
Reviewed-by: Leon Romanovsky <leonro@...dia.com>
Reviewed-by: Michael Chan <michael.chan@...adcom.com>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
Reviewed-by: Simon Horman <simon.horman@...igine.com>
---
RFC: remove a local variable as pointed out by Simon.
---
 drivers/net/ethernet/broadcom/bnx2.c      |  1 -
 drivers/net/ethernet/broadcom/bnxt/bnxt.c |  5 +----
 include/linux/skbuff.h                    | 12 ------------
 3 files changed, 1 insertion(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnx2.c b/drivers/net/ethernet/broadcom/bnx2.c
index 466e1d62bcf6..0d917a9699c5 100644
--- a/drivers/net/ethernet/broadcom/bnx2.c
+++ b/drivers/net/ethernet/broadcom/bnx2.c
@@ -2955,7 +2955,6 @@ bnx2_reuse_rx_skb_pages(struct bnx2 *bp, struct bnx2_rx_ring_info *rxr,
 		shinfo = skb_shinfo(skb);
 		shinfo->nr_frags--;
 		page = skb_frag_page(&shinfo->frags[shinfo->nr_frags]);
-		__skb_frag_set_page(&shinfo->frags[shinfo->nr_frags], NULL);
 
 		cons_rx_pg->page = page;
 		dev_kfree_skb(skb);
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index efaff5018af8..f42e51bd3e42 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -1102,10 +1102,7 @@ static u32 __bnxt_rx_agg_pages(struct bnxt *bp,
 			xdp_buff_set_frag_pfmemalloc(xdp);
 
 		if (bnxt_alloc_rx_page(bp, rxr, prod, GFP_ATOMIC) != 0) {
-			unsigned int nr_frags;
-
-			nr_frags = --shinfo->nr_frags;
-			__skb_frag_set_page(&shinfo->frags[nr_frags], NULL);
+			--shinfo->nr_frags;
 			cons_rx_buf->page = page;
 
 			/* Update prod since possibly some pages have been
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 30be21c7d05f..00e8c435fa1a 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3491,18 +3491,6 @@ static inline void skb_frag_page_copy(skb_frag_t *fragto,
 	fragto->bv_page = fragfrom->bv_page;
 }
 
-/**
- * __skb_frag_set_page - sets the page contained in a paged fragment
- * @frag: the paged fragment
- * @page: the page to set
- *
- * Sets the fragment @frag to contain @page.
- */
-static inline void __skb_frag_set_page(skb_frag_t *frag, struct page *page)
-{
-	frag->bv_page = page;
-}
-
 bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t prio);
 
 /**
-- 
2.33.0