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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
Subject: [PATCH v12 bpf-next 11/18] bpf: introduce bpf_xdp_get_buff_len helper
Date: Fri, 20 Aug 2021 17:40:24 +0200	[thread overview]
Message-ID: <330aa5c8bb21dc5967ef3a1eec300f71077c589c.1629473234.git.lorenzo@kernel.org> (raw)
In-Reply-To: <cover.1629473233.git.lorenzo@kernel.org>

Introduce bpf_xdp_get_buff_len helper in order to return the xdp buffer
total size (linear and paged area)

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 include/uapi/linux/bpf.h       |  7 +++++++
 net/core/filter.c              | 23 +++++++++++++++++++++++
 tools/include/uapi/linux/bpf.h |  7 +++++++
 3 files changed, 37 insertions(+)

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index c4f7892edb2b..9e2c3b12ea49 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -4871,6 +4871,12 @@ union bpf_attr {
  * 	Return
  *		Value specified by user at BPF link creation/attachment time
  *		or 0, if it was not specified.
+ *
+ * u64 bpf_xdp_get_buff_len(struct xdp_buff *xdp_md)
+ *	Description
+ *		Get the total size of a given xdp buff (linear and paged area)
+ *	Return
+ *		The total size of a given xdp buffer.
  */
 #define __BPF_FUNC_MAPPER(FN)		\
 	FN(unspec),			\
@@ -5048,6 +5054,7 @@ union bpf_attr {
 	FN(timer_cancel),		\
 	FN(get_func_ip),		\
 	FN(get_attach_cookie),		\
+	FN(xdp_get_buff_len),		\
 	/* */
 
 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
diff --git a/net/core/filter.c b/net/core/filter.c
index e6a589705813..53eaae2a5463 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3784,6 +3784,27 @@ static const struct bpf_func_proto sk_skb_change_head_proto = {
 	.arg2_type	= ARG_ANYTHING,
 	.arg3_type	= ARG_ANYTHING,
 };
+
+BPF_CALL_1(bpf_xdp_get_buff_len, struct  xdp_buff*, xdp)
+{
+	u64 len = xdp->data_end - xdp->data;
+
+	if (unlikely(xdp_buff_is_mb(xdp))) {
+		struct skb_shared_info *sinfo;
+
+		sinfo = xdp_get_shared_info_from_buff(xdp);
+		len += sinfo->xdp_frags_size;
+	}
+	return len;
+}
+
+static const struct bpf_func_proto bpf_xdp_get_buff_len_proto = {
+	.func		= bpf_xdp_get_buff_len,
+	.gpl_only	= false,
+	.ret_type	= RET_INTEGER,
+	.arg1_type	= ARG_PTR_TO_CTX,
+};
+
 static unsigned long xdp_get_metalen(const struct xdp_buff *xdp)
 {
 	return xdp_data_meta_unsupported(xdp) ? 0 :
@@ -7513,6 +7534,8 @@ xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_xdp_redirect_map_proto;
 	case BPF_FUNC_xdp_adjust_tail:
 		return &bpf_xdp_adjust_tail_proto;
+	case BPF_FUNC_xdp_get_buff_len:
+		return &bpf_xdp_get_buff_len_proto;
 	case BPF_FUNC_fib_lookup:
 		return &bpf_xdp_fib_lookup_proto;
 	case BPF_FUNC_check_mtu:
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index c4f7892edb2b..9e2c3b12ea49 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -4871,6 +4871,12 @@ union bpf_attr {
  * 	Return
  *		Value specified by user at BPF link creation/attachment time
  *		or 0, if it was not specified.
+ *
+ * u64 bpf_xdp_get_buff_len(struct xdp_buff *xdp_md)
+ *	Description
+ *		Get the total size of a given xdp buff (linear and paged area)
+ *	Return
+ *		The total size of a given xdp buffer.
  */
 #define __BPF_FUNC_MAPPER(FN)		\
 	FN(unspec),			\
@@ -5048,6 +5054,7 @@ union bpf_attr {
 	FN(timer_cancel),		\
 	FN(get_func_ip),		\
 	FN(get_attach_cookie),		\
+	FN(xdp_get_buff_len),		\
 	/* */
 
 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
-- 
2.31.1


  parent reply	other threads:[~2021-08-20 15:43 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-20 15:40 [PATCH v12 bpf-next 00/18] mvneta: introduce XDP multi-buffer support Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 01/18] net: skbuff: add size metadata to skb_shared_info for xdp Lorenzo Bianconi
2021-08-31 23:13   ` John Fastabend
2021-09-03 17:13     ` Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 02/18] xdp: introduce flags field in xdp_buff/xdp_frame Lorenzo Bianconi
2021-08-31 23:15   ` John Fastabend
2021-08-20 15:40 ` [PATCH v12 bpf-next 03/18] net: mvneta: update mb bit before passing the xdp buffer to eBPF layer Lorenzo Bianconi
2021-08-31 23:23   ` John Fastabend
2021-09-03 17:23     ` Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 04/18] net: mvneta: simplify mvneta_swbm_add_rx_fragment management Lorenzo Bianconi
2021-08-31 23:34   ` John Fastabend
2021-08-20 15:40 ` [PATCH v12 bpf-next 05/18] net: xdp: add xdp_update_skb_shared_info utility routine Lorenzo Bianconi
2021-08-31 23:38   ` John Fastabend
2021-08-20 15:40 ` [PATCH v12 bpf-next 06/18] net: marvell: rely on " Lorenzo Bianconi
2021-08-31 23:41   ` John Fastabend
2021-09-03 17:27     ` Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 07/18] xdp: add multi-buff support to xdp_return_{buff/frame} Lorenzo Bianconi
2021-08-31 23:43   ` John Fastabend
2021-08-20 15:40 ` [PATCH v12 bpf-next 08/18] net: mvneta: add multi buffer support to XDP_TX Lorenzo Bianconi
2021-08-31 23:44   ` John Fastabend
2021-08-20 15:40 ` [PATCH v12 bpf-next 09/18] net: mvneta: enable jumbo frames for XDP Lorenzo Bianconi
2021-08-31 23:45   ` John Fastabend
2021-08-20 15:40 ` [PATCH v12 bpf-next 10/18] bpf: add multi-buff support to the bpf_xdp_adjust_tail() API Lorenzo Bianconi
2021-09-01  0:10   ` John Fastabend
2021-08-20 15:40 ` Lorenzo Bianconi [this message]
2021-09-01  0:12   ` [PATCH v12 bpf-next 11/18] bpf: introduce bpf_xdp_get_buff_len helper John Fastabend
2021-08-20 15:40 ` [PATCH v12 bpf-next 12/18] bpf: add multi-buffer support to xdp copy helpers Lorenzo Bianconi
2021-09-01  0:19   ` John Fastabend
2021-08-20 15:40 ` [PATCH v12 bpf-next 13/18] bpf: move user_size out of bpf_test_init Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 14/18] bpf: introduce multibuff support to bpf_prog_test_run_xdp() Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 15/18] bpf: test_run: add xdp_shared_info pointer in bpf_test_finish signature Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 16/18] bpf: update xdp_adjust_tail selftest to include multi-buffer Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 17/18] net: xdp: introduce bpf_xdp_adjust_data helper Lorenzo Bianconi
2021-09-01  0:36   ` John Fastabend
2021-09-03 17:57     ` Lorenzo Bianconi
2021-08-20 15:40 ` [PATCH v12 bpf-next 18/18] bpf: add bpf_xdp_adjust_data selftest Lorenzo Bianconi
2021-09-01  0:45 ` [PATCH v12 bpf-next 00/18] mvneta: introduce XDP multi-buffer support John Fastabend
2021-09-07  8:35   ` Lorenzo Bianconi

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