From: Lorenzo Bianconi <lorenzo@kernel.org>
To: bpf@vger.kernel.org, netdev@vger.kernel.org
Cc: lorenzo.bianconi@redhat.com, davem@davemloft.net,
kuba@kernel.org, ast@kernel.org, daniel@iogearbox.net,
shayagr@amazon.com, john.fastabend@gmail.com, dsahern@kernel.org,
brouer@redhat.com, echaudro@redhat.com, jasowang@redhat.com,
alexander.duyck@gmail.com, saeed@kernel.org,
maciej.fijalkowski@intel.com, magnus.karlsson@intel.com,
tirthendu.sarkar@intel.com, toke@redhat.com,
andrii.nakryiko@gmail.com
Subject: [PATCH v23 bpf-next 05/23] net: xdp: add xdp_update_skb_shared_info utility routine
Date: Fri, 21 Jan 2022 11:09:48 +0100 [thread overview]
Message-ID: <bfd23fb8a8d7438724f7819c567cdf99ffd6226f.1642758637.git.lorenzo@kernel.org> (raw)
In-Reply-To: <cover.1642758637.git.lorenzo@kernel.org>
Introduce xdp_update_skb_shared_info routine to update frags array
metadata in skb_shared_info data structure converting to a skb from
a xdp_buff or xdp_frame.
According to the current skb_shared_info architecture in
xdp_frame/xdp_buff and to the xdp frags support, there is
no need to run skb_add_rx_frag() and reset frags array converting the buffer
to a skb since the frag array will be in the same position for xdp_buff/xdp_frame
and for the skb, we just need to update memory metadata.
Introduce XDP_FLAGS_PF_MEMALLOC flag in xdp_buff_flags in order to mark
the xdp_buff or xdp_frame as under memory-pressure if pages of the frags array
are under memory pressure. Doing so we can avoid looping over all fragments in
xdp_update_skb_shared_info routine. The driver is expected to set the
flag constructing the xdp_buffer using xdp_buff_set_frag_pfmemalloc
utility routine.
Rely on xdp_update_skb_shared_info in __xdp_build_skb_from_frame routine
converting the non-linear xdp_frame to a skb after performing a XDP_REDIRECT.
Acked-by: Toke Hoiland-Jorgensen <toke@redhat.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
include/net/xdp.h | 33 ++++++++++++++++++++++++++++++++-
net/core/xdp.c | 12 ++++++++++++
2 files changed, 44 insertions(+), 1 deletion(-)
diff --git a/include/net/xdp.h b/include/net/xdp.h
index 485e9495a690..1f8641ec658e 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -67,7 +67,10 @@ struct xdp_txq_info {
};
enum xdp_buff_flags {
- XDP_FLAGS_HAS_FRAGS = BIT(0), /* non-linear xdp buff */
+ XDP_FLAGS_HAS_FRAGS = BIT(0), /* non-linear xdp buff */
+ XDP_FLAGS_FRAGS_PF_MEMALLOC = BIT(1), /* xdp paged memory is under
+ * pressure
+ */
};
struct xdp_buff {
@@ -96,6 +99,16 @@ 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(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 void
xdp_init_buff(struct xdp_buff *xdp, u32 frame_sz, struct xdp_rxq_info *rxq)
{
@@ -151,6 +164,11 @@ static __always_inline bool xdp_frame_has_frags(struct xdp_frame *frame)
return !!(frame->flags & XDP_FLAGS_HAS_FRAGS);
}
+static __always_inline bool xdp_frame_is_frag_pfmemalloc(struct xdp_frame *frame)
+{
+ return !!(frame->flags & XDP_FLAGS_FRAGS_PF_MEMALLOC);
+}
+
#define XDP_BULK_QUEUE_SIZE 16
struct xdp_frame_bulk {
int count;
@@ -186,6 +204,19 @@ static inline void xdp_scrub_frame(struct xdp_frame *frame)
frame->dev_rx = NULL;
}
+static inline void
+xdp_update_skb_shared_info(struct sk_buff *skb, u8 nr_frags,
+ unsigned int size, unsigned int truesize,
+ bool pfmemalloc)
+{
+ skb_shinfo(skb)->nr_frags = nr_frags;
+
+ skb->len += size;
+ skb->data_len += size;
+ skb->truesize += truesize;
+ skb->pfmemalloc |= pfmemalloc;
+}
+
/* Avoids inlining WARN macro in fast-path */
void xdp_warn(const char *msg, const char *func, const int line);
#define XDP_WARN(msg) xdp_warn(msg, __func__, __LINE__)
diff --git a/net/core/xdp.c b/net/core/xdp.c
index 7aba35504986..9e469f5f434c 100644
--- a/net/core/xdp.c
+++ b/net/core/xdp.c
@@ -561,8 +561,14 @@ struct sk_buff *__xdp_build_skb_from_frame(struct xdp_frame *xdpf,
struct sk_buff *skb,
struct net_device *dev)
{
+ struct skb_shared_info *sinfo = xdp_get_shared_info_from_frame(xdpf);
unsigned int headroom, frame_size;
void *hard_start;
+ u8 nr_frags;
+
+ /* xdp frags frame */
+ if (unlikely(xdp_frame_has_frags(xdpf)))
+ nr_frags = sinfo->nr_frags;
/* Part of headroom was reserved to xdpf */
headroom = sizeof(*xdpf) + xdpf->headroom;
@@ -582,6 +588,12 @@ struct sk_buff *__xdp_build_skb_from_frame(struct xdp_frame *xdpf,
if (xdpf->metasize)
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));
+
/* Essential SKB info: protocol and skb->dev */
skb->protocol = eth_type_trans(skb, dev);
--
2.34.1
next prev parent reply other threads:[~2022-01-21 10:11 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-21 10:09 [PATCH v23 bpf-next 00/23] mvneta: introduce XDP multi-buffer support Lorenzo Bianconi
2022-01-21 10:09 ` [PATCH v23 bpf-next 01/23] net: skbuff: add size metadata to skb_shared_info for xdp Lorenzo Bianconi
2022-01-21 10:09 ` [PATCH v23 bpf-next 02/23] xdp: introduce flags field in xdp_buff/xdp_frame Lorenzo Bianconi
2022-01-21 10:09 ` [PATCH v23 bpf-next 03/23] net: mvneta: update frags bit before passing the xdp buffer to eBPF layer Lorenzo Bianconi
2022-01-21 10:09 ` [PATCH v23 bpf-next 04/23] net: mvneta: simplify mvneta_swbm_add_rx_fragment management Lorenzo Bianconi
2022-01-21 10:09 ` Lorenzo Bianconi [this message]
2022-01-21 10:09 ` [PATCH v23 bpf-next 06/23] net: marvell: rely on xdp_update_skb_shared_info utility routine Lorenzo Bianconi
2022-01-21 10:09 ` [PATCH v23 bpf-next 07/23] xdp: add frags support to xdp_return_{buff/frame} Lorenzo Bianconi
2022-01-21 10:09 ` [PATCH v23 bpf-next 08/23] net: mvneta: add frags support to XDP_TX Lorenzo Bianconi
2022-01-21 10:09 ` [PATCH v23 bpf-next 09/23] bpf: introduce BPF_F_XDP_HAS_FRAGS flag in prog_flags loading the ebpf program Lorenzo Bianconi
2022-01-21 10:09 ` [PATCH v23 bpf-next 10/23] net: mvneta: enable jumbo frames if the loaded XDP program support frags Lorenzo Bianconi
2022-01-21 10:09 ` [PATCH v23 bpf-next 11/23] bpf: introduce bpf_xdp_get_buff_len helper Lorenzo Bianconi
2022-01-21 10:09 ` [PATCH v23 bpf-next 12/23] bpf: add frags support to the bpf_xdp_adjust_tail() API Lorenzo Bianconi
2022-01-21 10:09 ` [PATCH v23 bpf-next 13/23] bpf: add frags support to xdp copy helpers Lorenzo Bianconi
2022-01-21 10:09 ` [PATCH v23 bpf-next 14/23] bpf: move user_size out of bpf_test_init Lorenzo Bianconi
2022-01-21 10:09 ` [PATCH v23 bpf-next 15/23] bpf: introduce frags support to bpf_prog_test_run_xdp() Lorenzo Bianconi
2022-01-21 10:09 ` [PATCH v23 bpf-next 16/23] bpf: test_run: add xdp_shared_info pointer in bpf_test_finish signature Lorenzo Bianconi
2022-01-21 10:10 ` [PATCH v23 bpf-next 17/23] bpf: selftests: update xdp_adjust_tail selftest to include xdp frags Lorenzo Bianconi
2022-01-21 10:10 ` [PATCH v23 bpf-next 18/23] libbpf: Add SEC name for xdp frags programs Lorenzo Bianconi
2022-01-21 10:10 ` [PATCH v23 bpf-next 19/23] bpf: generalise tail call map compatibility check Lorenzo Bianconi
2022-01-21 10:10 ` [PATCH v23 bpf-next 20/23] net: xdp: introduce bpf_xdp_pointer utility routine Lorenzo Bianconi
2022-01-21 10:10 ` [PATCH v23 bpf-next 21/23] bpf: selftests: introduce bpf_xdp_{load,store}_bytes selftest Lorenzo Bianconi
2022-01-21 10:10 ` [PATCH v23 bpf-next 22/23] bpf: selftests: add CPUMAP/DEVMAP selftests for xdp frags Lorenzo Bianconi
2022-01-21 10:10 ` [PATCH v23 bpf-next 23/23] xdp: disable XDP_REDIRECT " Lorenzo Bianconi
2022-01-21 22:21 ` [PATCH v23 bpf-next 00/23] mvneta: introduce XDP multi-buffer support Alexei Starovoitov
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