net: xdp: pass full flags to xdp_update_skb_shared_info()

xdp_update_skb_shared_info() needs to update skb state which
was maintained in xdp_buff / frame. Pass full flags into it,
instead of breaking it out bit by bit. We will need to add
a bit for unreadable frags (even tho XDP doesn't support
those the driver paths may be common), at which point almost
all call sites would become:

    xdp_update_skb_shared_info(skb, num_frags,
                               sinfo->xdp_frags_size,
                               MY_PAGE_SIZE * num_frags,
                               xdp_buff_is_frag_pfmemalloc(xdp),
                               xdp_buff_is_frag_unreadable(xdp));

Keep a helper for accessing the flags, in case we need to
transform them somehow in the future (e.g. to cover up xdp_buff
vs xdp_frame differences).

While we are touching call callers - rename the helper to
xdp_update_skb_frags_info(), previous name may have implied that
it's shinfo that's updated. We are updating flags in struct sk_buff
based on frags that got attched.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Jesper Dangaard Brouer <hawk@kernel.org>
Link: https://patch.msgid.link/20250905221539.2930285-2-kuba@kernel.org
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c

@@ -468,9 +468,8 @@ bnxt_xdp_build_skb(struct bnxt *bp, struct sk_buff *skb, u8 num_frags,
 	if (!skb)
 		return NULL;
 
-	xdp_update_skb_shared_info(skb, num_frags,
-				   sinfo->xdp_frags_size,
-				   BNXT_RX_PAGE_SIZE * num_frags,
-				   xdp_buff_is_frag_pfmemalloc(xdp));
+	xdp_update_skb_frags_info(skb, num_frags, sinfo->xdp_frags_size,
+				  BNXT_RX_PAGE_SIZE * num_frags,
+				  xdp_buff_get_skb_flags(xdp));
 	return skb;
 }

drivers/net/ethernet/intel/i40e/i40e_txrx.c

@@ -2151,10 +2151,10 @@ static struct sk_buff *i40e_construct_skb(struct i40e_ring *rx_ring,
 		memcpy(&skinfo->frags[skinfo->nr_frags], &sinfo->frags[0],
 		       sizeof(skb_frag_t) * nr_frags);
 
-		xdp_update_skb_shared_info(skb, skinfo->nr_frags + nr_frags,
-					   sinfo->xdp_frags_size,
-					   nr_frags * xdp->frame_sz,
-					   xdp_buff_is_frag_pfmemalloc(xdp));
+		xdp_update_skb_frags_info(skb, skinfo->nr_frags + nr_frags,
+					  sinfo->xdp_frags_size,
+					  nr_frags * xdp->frame_sz,
+					  xdp_buff_get_skb_flags(xdp));
 
 		/* First buffer has already been processed, so bump ntc */
 		if (++rx_ring->next_to_clean == rx_ring->count)
@@ -2206,10 +2206,9 @@ static struct sk_buff *i40e_build_skb(struct i40e_ring *rx_ring,
 		skb_metadata_set(skb, metasize);
 
 	if (unlikely(xdp_buff_has_frags(xdp))) {
-		xdp_update_skb_shared_info(skb, nr_frags,
-					   sinfo->xdp_frags_size,
-					   nr_frags * xdp->frame_sz,
-					   xdp_buff_is_frag_pfmemalloc(xdp));
+		xdp_update_skb_frags_info(skb, nr_frags, sinfo->xdp_frags_size,
+					  nr_frags * xdp->frame_sz,
+					  xdp_buff_get_skb_flags(xdp));
 
 		i40e_process_rx_buffs(rx_ring, I40E_XDP_PASS, xdp);
 	} else {

drivers/net/ethernet/intel/ice/ice_txrx.c

@@ -1035,10 +1035,9 @@ ice_build_skb(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp)
 		skb_metadata_set(skb, metasize);
 
 	if (unlikely(xdp_buff_has_frags(xdp)))
-		xdp_update_skb_shared_info(skb, nr_frags,
-					   sinfo->xdp_frags_size,
-					   nr_frags * xdp->frame_sz,
-					   xdp_buff_is_frag_pfmemalloc(xdp));
+		xdp_update_skb_frags_info(skb, nr_frags, sinfo->xdp_frags_size,
+					  nr_frags * xdp->frame_sz,
+					  xdp_buff_get_skb_flags(xdp));
 
 	return skb;
 }
@@ -1115,10 +1114,10 @@ ice_construct_skb(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp)
 		memcpy(&skinfo->frags[skinfo->nr_frags], &sinfo->frags[0],
 		       sizeof(skb_frag_t) * nr_frags);
 
-		xdp_update_skb_shared_info(skb, skinfo->nr_frags + nr_frags,
-					   sinfo->xdp_frags_size,
-					   nr_frags * xdp->frame_sz,
-					   xdp_buff_is_frag_pfmemalloc(xdp));
+		xdp_update_skb_frags_info(skb, skinfo->nr_frags + nr_frags,
+					  sinfo->xdp_frags_size,
+					  nr_frags * xdp->frame_sz,
+					  xdp_buff_get_skb_flags(xdp));
 	}
 
 	return skb;

drivers/net/ethernet/marvell/mvneta.c

@@ -2416,10 +2416,9 @@ mvneta_swbm_build_skb(struct mvneta_port *pp, struct page_pool *pool,
 	skb->ip_summed = mvneta_rx_csum(pp, desc_status);
 
 	if (unlikely(xdp_buff_has_frags(xdp)))
-		xdp_update_skb_shared_info(skb, num_frags,
-					   sinfo->xdp_frags_size,
-					   num_frags * xdp->frame_sz,
-					   xdp_buff_is_frag_pfmemalloc(xdp));
+		xdp_update_skb_frags_info(skb, num_frags, sinfo->xdp_frags_size,
+					  num_frags * xdp->frame_sz,
+					  xdp_buff_get_skb_flags(xdp));
 
 	return skb;
 }

drivers/net/ethernet/mellanox/mlx5/core/en_rx.c

@@ -1796,10 +1796,9 @@ mlx5e_skb_from_cqe_nonlinear(struct mlx5e_rq *rq, struct mlx5e_wqe_frag_info *wi
 
 	if (xdp_buff_has_frags(&mxbuf->xdp)) {
 		/* sinfo->nr_frags is reset by build_skb, calculate again. */
-		xdp_update_skb_shared_info(skb, wi - head_wi - 1,
-					   sinfo->xdp_frags_size, truesize,
-					   xdp_buff_is_frag_pfmemalloc(
-						&mxbuf->xdp));
+		xdp_update_skb_frags_info(skb, wi - head_wi - 1,
+					  sinfo->xdp_frags_size, truesize,
+					  xdp_buff_get_skb_flags(&mxbuf->xdp));
 
 		for (struct mlx5e_wqe_frag_info *pwi = head_wi + 1; pwi < wi; pwi++)
 			pwi->frag_page->frags++;
@@ -2105,10 +2104,10 @@ mlx5e_skb_from_cqe_mpwrq_nonlinear(struct mlx5e_rq *rq, struct mlx5e_mpw_info *w
 			struct mlx5e_frag_page *pagep;
 
 			/* sinfo->nr_frags is reset by build_skb, calculate again. */
-			xdp_update_skb_shared_info(skb, frag_page - head_page,
-						   sinfo->xdp_frags_size, truesize,
-						   xdp_buff_is_frag_pfmemalloc(
-							&mxbuf->xdp));
+			xdp_update_skb_frags_info(skb, frag_page - head_page,
+						  sinfo->xdp_frags_size,
+						  truesize,
+						  xdp_buff_get_skb_flags(&mxbuf->xdp));
 
 			pagep = head_page;
 			do
@@ -2122,10 +2121,10 @@ mlx5e_skb_from_cqe_mpwrq_nonlinear(struct mlx5e_rq *rq, struct mlx5e_mpw_info *w
 		if (xdp_buff_has_frags(&mxbuf->xdp)) {
 			struct mlx5e_frag_page *pagep;
 
-			xdp_update_skb_shared_info(skb, sinfo->nr_frags,
-						   sinfo->xdp_frags_size, truesize,
-						   xdp_buff_is_frag_pfmemalloc(
-							&mxbuf->xdp));
+			xdp_update_skb_frags_info(skb, sinfo->nr_frags,
+						  sinfo->xdp_frags_size,
+						  truesize,
+						  xdp_buff_get_skb_flags(&mxbuf->xdp));
 
 			pagep = frag_page - sinfo->nr_frags;
 			do

drivers/net/virtio_net.c

@@ -2185,10 +2185,9 @@ static struct sk_buff *build_skb_from_xdp_buff(struct net_device *dev,
 		skb_metadata_set(skb, metasize);
 
 	if (unlikely(xdp_buff_has_frags(xdp)))
-		xdp_update_skb_shared_info(skb, nr_frags,
-					   sinfo->xdp_frags_size,
-					   xdp_frags_truesz,
-					   xdp_buff_is_frag_pfmemalloc(xdp));
+		xdp_update_skb_frags_info(skb, nr_frags, sinfo->xdp_frags_size,
+					  xdp_frags_truesz,
+					  xdp_buff_get_skb_flags(xdp));
 
 	return skb;
 }

include/net/xdp.h

@@ -116,17 +116,16 @@ static __always_inline void xdp_buff_clear_frags_flag(struct xdp_buff *xdp)
 	xdp->flags &= ~XDP_FLAGS_HAS_FRAGS;
 }
 
-static __always_inline bool
-xdp_buff_is_frag_pfmemalloc(const struct xdp_buff *xdp)
-{
-	return !!(xdp->flags & XDP_FLAGS_FRAGS_PF_MEMALLOC);
-}
-
 static __always_inline void xdp_buff_set_frag_pfmemalloc(struct xdp_buff *xdp)
 {
 	xdp->flags |= XDP_FLAGS_FRAGS_PF_MEMALLOC;
 }
 
+static __always_inline u32 xdp_buff_get_skb_flags(const struct xdp_buff *xdp)
+{
+	return xdp->flags;
+}
+
 static __always_inline void
 xdp_init_buff(struct xdp_buff *xdp, u32 frame_sz, struct xdp_rxq_info *rxq)
 {
@@ -294,10 +293,10 @@ static __always_inline bool xdp_frame_has_frags(const struct xdp_frame *frame)
 	return !!(frame->flags & XDP_FLAGS_HAS_FRAGS);
 }
 
-static __always_inline bool
-xdp_frame_is_frag_pfmemalloc(const struct xdp_frame *frame)
+static __always_inline u32
+xdp_frame_get_skb_flags(const struct xdp_frame *frame)
 {
-	return !!(frame->flags & XDP_FLAGS_FRAGS_PF_MEMALLOC);
+	return frame->flags;
 }
 
 #define XDP_BULK_QUEUE_SIZE	16
@@ -334,9 +333,9 @@ static inline void xdp_scrub_frame(struct xdp_frame *frame)
 }
 
 static inline void
-xdp_update_skb_shared_info(struct sk_buff *skb, u8 nr_frags,
-			   unsigned int size, unsigned int truesize,
-			   bool pfmemalloc)
+xdp_update_skb_frags_info(struct sk_buff *skb, u8 nr_frags,
+			  unsigned int size, unsigned int truesize,
+			  u32 xdp_flags)
 {
 	struct skb_shared_info *sinfo = skb_shinfo(skb);
 
@@ -350,7 +349,7 @@ xdp_update_skb_shared_info(struct sk_buff *skb, u8 nr_frags,
 	skb->len += size;
 	skb->data_len += size;
 	skb->truesize += truesize;
-	skb->pfmemalloc |= pfmemalloc;
+	skb->pfmemalloc |= !!(xdp_flags & XDP_FLAGS_FRAGS_PF_MEMALLOC);
 }
 
 /* Avoids inlining WARN macro in fast-path */

net/core/xdp.c

@@ -663,9 +663,8 @@ struct sk_buff *xdp_build_skb_from_buff(const struct xdp_buff *xdp)
 		u32 tsize;
 
 		tsize = sinfo->xdp_frags_truesize ? : nr_frags * xdp->frame_sz;
-		xdp_update_skb_shared_info(skb, nr_frags,
-					   sinfo->xdp_frags_size, tsize,
-					   xdp_buff_is_frag_pfmemalloc(xdp));
+		xdp_update_skb_frags_info(skb, nr_frags, sinfo->xdp_frags_size,
+					  tsize, xdp_buff_get_skb_flags(xdp));
 	}
 
 	skb->protocol = eth_type_trans(skb, rxq->dev);
@@ -692,7 +691,7 @@ static noinline bool xdp_copy_frags_from_zc(struct sk_buff *skb,
 	struct skb_shared_info *sinfo = skb_shinfo(skb);
 	const struct skb_shared_info *xinfo;
 	u32 nr_frags, tsize = 0;
-	bool pfmemalloc = false;
+	u32 flags = 0;
 
 	xinfo = xdp_get_shared_info_from_buff(xdp);
 	nr_frags = xinfo->nr_frags;
@@ -714,11 +713,12 @@ static noinline bool xdp_copy_frags_from_zc(struct sk_buff *skb,
 		__skb_fill_page_desc_noacc(sinfo, i, page, offset, len);
 
 		tsize += truesize;
-		pfmemalloc |= page_is_pfmemalloc(page);
+		if (page_is_pfmemalloc(page))
+			flags |= XDP_FLAGS_FRAGS_PF_MEMALLOC;
 	}
 
-	xdp_update_skb_shared_info(skb, nr_frags, xinfo->xdp_frags_size,
-				   tsize, pfmemalloc);
+	xdp_update_skb_frags_info(skb, nr_frags, xinfo->xdp_frags_size, tsize,
+				  flags);
 
 	return true;
 }
@@ -823,10 +823,9 @@ struct sk_buff *__xdp_build_skb_from_frame(struct xdp_frame *xdpf,
 		skb_metadata_set(skb, xdpf->metasize);
 
 	if (unlikely(xdp_frame_has_frags(xdpf)))
-		xdp_update_skb_shared_info(skb, nr_frags,
-					   sinfo->xdp_frags_size,
-					   nr_frags * xdpf->frame_sz,
-					   xdp_frame_is_frag_pfmemalloc(xdpf));
+		xdp_update_skb_frags_info(skb, nr_frags, sinfo->xdp_frags_size,
+					  nr_frags * xdpf->frame_sz,
+					  xdp_frame_get_skb_flags(xdpf));
 
 	/* Essential SKB info: protocol and skb->dev */
 	skb->protocol = eth_type_trans(skb, dev);