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Message-ID: <20250905221539.2930285-2-kuba@kernel.org>
Date: Fri, 5 Sep 2025 15:15:38 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
edumazet@...gle.com,
pabeni@...hat.com,
andrew+netdev@...n.ch,
horms@...nel.org,
daniel@...earbox.net,
hawk@...nel.org,
john.fastabend@...il.com,
sdf@...ichev.me,
michael.chan@...adcom.com,
anthony.l.nguyen@...el.com,
marcin.s.wojtas@...il.com,
tariqt@...dia.com,
mbloch@...dia.com,
jasowang@...hat.com,
bpf@...r.kernel.org,
aleksander.lobakin@...el.com,
pavan.chebbi@...adcom.com,
przemyslaw.kitszel@...el.com,
Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next 1/2] 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@...nel.org>
---
v1:
- rename skb_flags arg to xdp_flags
- rename xdp_update_skb_shared_info() -> xdp_update_skb_frags_info()
RFC: https://lore.kernel.org/20250812161528.835855-1-kuba@kernel.org
---
include/net/xdp.h | 25 +++++++++----------
drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c | 7 +++---
drivers/net/ethernet/intel/i40e/i40e_txrx.c | 15 ++++++-----
drivers/net/ethernet/intel/ice/ice_txrx.c | 15 ++++++-----
drivers/net/ethernet/marvell/mvneta.c | 7 +++---
.../net/ethernet/mellanox/mlx5/core/en_rx.c | 23 ++++++++---------
drivers/net/virtio_net.c | 7 +++---
net/core/xdp.c | 21 ++++++++--------
8 files changed, 56 insertions(+), 64 deletions(-)
diff --git a/include/net/xdp.h b/include/net/xdp.h
index b40f1f96cb11..57189fc21168 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -104,17 +104,16 @@ 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)
{
@@ -272,10 +271,10 @@ 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
@@ -312,9 +311,9 @@ 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);
@@ -328,7 +327,7 @@ 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 */
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
index 58d579dca3f1..3e77a96e5a3e 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
+++ b/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;
}
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 048c33039130..98601c62c592 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/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 {
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index d2871757ec94..107632a71f3c 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/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;
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 476e73e502fe..7351e98d73f4 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/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;
}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index b8c609d91d11..2925ece136c4 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/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
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 975bdc5dab84..06708c9a979e 100644
--- a/drivers/net/virtio_net.c
+++ b/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;
}
diff --git a/net/core/xdp.c b/net/core/xdp.c
index 491334b9b8be..9100e160113a 100644
--- a/net/core/xdp.c
+++ b/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);
--
2.51.0
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