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, sameehj@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
Subject: [PATCH v8 bpf-next 10/14] bpf: add new frame_length field to the XDP ctx
Date: Thu, 8 Apr 2021 14:51:02 +0200 [thread overview]
Message-ID: <ef8be9a1431875a6bce84dd07149c6e8eb874403.1617885385.git.lorenzo@kernel.org> (raw)
In-Reply-To: <cover.1617885385.git.lorenzo@kernel.org>
From: Eelco Chaudron <echaudro@redhat.com>
This patch adds a new field to the XDP context called frame_length,
which will hold the full length of the packet, including fragments
if existing.
eBPF programs can determine if fragments are present using something
like:
if (ctx->data_end - ctx->data < ctx->frame_length) {
/* Fragements exists. /*
}
Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
include/linux/filter.h | 7 +++++++
include/net/xdp.h | 15 +++++++++++++++
include/uapi/linux/bpf.h | 1 +
net/core/filter.c | 8 ++++++++
net/core/xdp.c | 1 +
tools/include/uapi/linux/bpf.h | 1 +
6 files changed, 33 insertions(+)
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 9a09547bc7ba..d378a448f673 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -768,6 +768,13 @@ static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog,
* already takes rcu_read_lock() when fetching the program, so
* it's not necessary here anymore.
*/
+ xdp->frame_length = xdp->data_end - xdp->data;
+ if (unlikely(xdp->mb)) {
+ struct xdp_shared_info *xdp_sinfo;
+
+ xdp_sinfo = xdp_get_shared_info_from_buff(xdp);
+ xdp->frame_length += xdp_sinfo->data_length;
+ }
return __BPF_PROG_RUN(prog, xdp, BPF_DISPATCHER_FUNC(xdp));
}
diff --git a/include/net/xdp.h b/include/net/xdp.h
index 55751cf2badf..e41022894770 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -77,6 +77,13 @@ struct xdp_buff {
* tailroom
*/
u32 mb:1; /* xdp non-linear buffer */
+ u32 frame_length; /* Total frame length across all buffers. Only needs
+ * to be updated by helper functions, as it will be
+ * initialized at XDP program start. This field only
+ * needs 17-bits (128kB). In case the remaining bits
+ * need to be re-purposed, please make sure the
+ * xdp_convert_ctx_access() function gets updated.
+ */
};
static __always_inline void
@@ -237,6 +244,14 @@ void xdp_convert_frame_to_buff(struct xdp_frame *frame, struct xdp_buff *xdp)
xdp->data_meta = frame->data - frame->metasize;
xdp->frame_sz = frame->frame_sz;
xdp->mb = frame->mb;
+ xdp->frame_length = frame->len;
+
+ if (unlikely(xdp->mb)) {
+ struct xdp_shared_info *xdp_sinfo;
+
+ xdp_sinfo = xdp_get_shared_info_from_buff(xdp);
+ xdp->frame_length += xdp_sinfo->data_length;
+ }
}
static inline
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 49371eba98ba..643ef5979d42 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -5224,6 +5224,7 @@ struct xdp_md {
__u32 rx_queue_index; /* rxq->queue_index */
__u32 egress_ifindex; /* txq->dev->ifindex */
+ __u32 frame_length;
};
/* DEVMAP map-value layout
diff --git a/net/core/filter.c b/net/core/filter.c
index c00f52ab2532..8f8613745f0e 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3873,6 +3873,7 @@ static int bpf_xdp_mb_adjust_tail(struct xdp_buff *xdp, int offset)
memset(xdp_get_frag_address(frag) + size, 0, offset);
xdp_set_frag_size(frag, size + offset);
xdp_sinfo->data_length += offset;
+ xdp->frame_length += offset;
} else {
int i, frags_to_free = 0;
@@ -3894,6 +3895,7 @@ static int bpf_xdp_mb_adjust_tail(struct xdp_buff *xdp, int offset)
* to adjust the data_length in line.
*/
xdp_sinfo->data_length -= shrink;
+ xdp->frame_length -= shrink;
xdp_set_frag_size(frag, size - shrink);
break;
}
@@ -9137,6 +9139,12 @@ static u32 xdp_convert_ctx_access(enum bpf_access_type type,
*insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
offsetof(struct net_device, ifindex));
break;
+ case offsetof(struct xdp_md, frame_length):
+ *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff,
+ frame_length),
+ si->dst_reg, si->src_reg,
+ offsetof(struct xdp_buff, frame_length));
+ break;
}
return insn - insn_buf;
diff --git a/net/core/xdp.c b/net/core/xdp.c
index 7388bc6d680b..fb7d0724a5b6 100644
--- a/net/core/xdp.c
+++ b/net/core/xdp.c
@@ -510,6 +510,7 @@ void xdp_return_num_frags_from_buff(struct xdp_buff *xdp, u16 num_frags)
struct page *page = xdp_get_frag_page(frag);
xdp_sinfo->data_length -= xdp_get_frag_size(frag);
+ xdp->frame_length -= xdp_get_frag_size(frag);
__xdp_return(page_address(page), &xdp->rxq->mem, false, NULL);
}
xdp_sinfo->nr_frags -= num_frags;
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 69902603012c..5c2a497bfcf1 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -5218,6 +5218,7 @@ struct xdp_md {
__u32 rx_queue_index; /* rxq->queue_index */
__u32 egress_ifindex; /* txq->dev->ifindex */
+ __u32 frame_length;
};
/* DEVMAP map-value layout
--
2.30.2
next prev parent reply other threads:[~2021-04-08 12:52 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-08 12:50 [PATCH v8 bpf-next 00/14] mvneta: introduce XDP multi-buffer support Lorenzo Bianconi
2021-04-08 12:50 ` [PATCH v8 bpf-next 01/14] xdp: introduce mb in xdp_buff/xdp_frame Lorenzo Bianconi
2021-04-08 18:17 ` Vladimir Oltean
2021-04-09 16:03 ` Lorenzo Bianconi
2021-04-29 13:36 ` Jesper Dangaard Brouer
2021-04-29 13:54 ` Lorenzo Bianconi
2021-04-08 12:50 ` [PATCH v8 bpf-next 02/14] xdp: add xdp_shared_info data structure Lorenzo Bianconi
2021-04-08 13:39 ` Vladimir Oltean
2021-04-08 14:26 ` Lorenzo Bianconi
2021-04-08 18:06 ` kernel test robot
2021-04-08 12:50 ` [PATCH v8 bpf-next 03/14] net: mvneta: update mb bit before passing the xdp buffer to eBPF layer Lorenzo Bianconi
2021-04-08 18:19 ` Vladimir Oltean
2021-04-09 16:24 ` Lorenzo Bianconi
2021-04-08 12:50 ` [PATCH v8 bpf-next 04/14] xdp: add multi-buff support to xdp_return_{buff/frame} Lorenzo Bianconi
2021-04-08 18:30 ` Vladimir Oltean
2021-04-09 16:28 ` Lorenzo Bianconi
2021-04-08 12:50 ` [PATCH v8 bpf-next 05/14] net: mvneta: add multi buffer support to XDP_TX Lorenzo Bianconi
2021-04-08 18:40 ` Vladimir Oltean
2021-04-09 16:36 ` Lorenzo Bianconi
2021-04-08 12:50 ` [PATCH v8 bpf-next 06/14] net: mvneta: enable jumbo frames for XDP Lorenzo Bianconi
2021-04-08 12:50 ` [PATCH v8 bpf-next 07/14] net: xdp: add multi-buff support to xdp_build_skb_from_fram Lorenzo Bianconi
2021-04-08 12:51 ` [PATCH v8 bpf-next 08/14] bpf: add multi-buff support to the bpf_xdp_adjust_tail() API Lorenzo Bianconi
2021-04-08 19:15 ` Vladimir Oltean
2021-04-08 20:54 ` Vladimir Oltean
2021-04-09 18:13 ` Lorenzo Bianconi
2021-04-08 12:51 ` [PATCH v8 bpf-next 09/14] bpd: add multi-buffer support to xdp copy helpers Lorenzo Bianconi
2021-04-08 20:57 ` Vladimir Oltean
2021-04-09 18:19 ` Lorenzo Bianconi
2021-04-08 21:04 ` Vladimir Oltean
2021-04-14 8:08 ` Eelco Chaudron
2021-04-08 12:51 ` Lorenzo Bianconi [this message]
2021-04-08 12:51 ` [PATCH v8 bpf-next 11/14] bpf: move user_size out of bpf_test_init Lorenzo Bianconi
2021-04-08 12:51 ` [PATCH v8 bpf-next 12/14] bpf: introduce multibuff support to bpf_prog_test_run_xdp() Lorenzo Bianconi
2021-04-08 12:51 ` [PATCH v8 bpf-next 13/14] bpf: test_run: add xdp_shared_info pointer in bpf_test_finish signature Lorenzo Bianconi
2021-04-08 12:51 ` [PATCH v8 bpf-next 14/14] bpf: update xdp_adjust_tail selftest to include multi-buffer Lorenzo Bianconi
2021-04-09 0:56 ` [PATCH v8 bpf-next 00/14] mvneta: introduce XDP multi-buffer support John Fastabend
2021-04-09 20:16 ` Lorenzo Bianconi
2021-04-13 15:16 ` Eelco Chaudron
2021-04-16 14:27 ` Magnus Karlsson
2021-04-16 21:29 ` Lorenzo Bianconi
2021-04-16 23:00 ` Daniel Borkmann
2021-04-18 16:18 ` Jesper Dangaard Brouer
2021-04-19 6:20 ` Magnus Karlsson
2021-04-19 6:55 ` Lorenzo Bianconi
2021-04-20 13:49 ` Magnus Karlsson
2021-04-21 12:47 ` Jesper Dangaard Brouer
2021-04-21 14:12 ` Magnus Karlsson
2021-04-21 15:39 ` Jesper Dangaard Brouer
2021-04-22 10:24 ` Magnus Karlsson
2021-04-22 14:42 ` Jesper Dangaard Brouer
2021-04-22 15:05 ` Crash for i40e on net-next (was: [PATCH v8 bpf-next 00/14] mvneta: introduce XDP multi-buffer support) Jesper Dangaard Brouer
2021-04-23 5:28 ` Magnus Karlsson
2021-04-23 16:43 ` Alexander Duyck
2021-04-25 9:45 ` Magnus Karlsson
2021-04-27 18:28 ` [PATCH v8 bpf-next 00/14] mvneta: introduce XDP multi-buffer support Lorenzo Bianconi
2021-04-28 7:41 ` Magnus Karlsson
2021-04-29 12:49 ` Jesper Dangaard Brouer
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=ef8be9a1431875a6bce84dd07149c6e8eb874403.1617885385.git.lorenzo@kernel.org \
--to=lorenzo@kernel.org \
--cc=alexander.duyck@gmail.com \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=brouer@redhat.com \
--cc=daniel@iogearbox.net \
--cc=davem@davemloft.net \
--cc=dsahern@kernel.org \
--cc=echaudro@redhat.com \
--cc=jasowang@redhat.com \
--cc=john.fastabend@gmail.com \
--cc=kuba@kernel.org \
--cc=lorenzo.bianconi@redhat.com \
--cc=maciej.fijalkowski@intel.com \
--cc=netdev@vger.kernel.org \
--cc=saeed@kernel.org \
--cc=sameehj@amazon.com \
--cc=shayagr@amazon.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).