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Message-Id: <8cc30c50934fbfd9129aa1052b475a780295c1b7.1636044387.git.lorenzo@kernel.org>
Date: Thu, 4 Nov 2021 18:35:29 +0100
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: bpf@...r.kernel.org, netdev@...r.kernel.org
Cc: lorenzo.bianconi@...hat.com, davem@...emloft.net, kuba@...nel.org,
ast@...nel.org, daniel@...earbox.net, shayagr@...zon.com,
john.fastabend@...il.com, dsahern@...nel.org, brouer@...hat.com,
echaudro@...hat.com, jasowang@...hat.com,
alexander.duyck@...il.com, saeed@...nel.org,
maciej.fijalkowski@...el.com, magnus.karlsson@...el.com,
tirthendu.sarkar@...el.com, toke@...hat.com
Subject: [PATCH v17 bpf-next 09/23] bpf: introduce BPF_F_XDP_MB flag in prog_flags loading the ebpf program
Introduce BPF_F_XDP_MB and the related field in bpf_prog_aux in order to
notify the driver the loaded program support xdp multi-buffer.
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
include/linux/bpf.h | 1 +
include/uapi/linux/bpf.h | 5 +++++
kernel/bpf/syscall.c | 4 +++-
tools/include/uapi/linux/bpf.h | 5 +++++
4 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 2be6dfd68df9..ba31c22ad839 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -869,6 +869,7 @@ struct bpf_prog_aux {
bool func_proto_unreliable;
bool sleepable;
bool tail_call_reachable;
+ bool xdp_mb;
struct hlist_node tramp_hlist;
/* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
const struct btf_type *attach_func_proto;
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index ba5af15e25f5..d2abb7cff9b5 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -1111,6 +1111,11 @@ enum bpf_link_type {
*/
#define BPF_F_SLEEPABLE (1U << 4)
+/* If BPF_F_XDP_MB is used in BPF_PROG_LOAD command, the loaded program
+ * fully support xdp multi-buffer
+ */
+#define BPF_F_XDP_MB (1U << 5)
+
/* When BPF ldimm64's insn[0].src_reg != 0 then this can have
* the following extensions:
*
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 50f96ea4452a..fbae37d5b329 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -2202,7 +2202,8 @@ static int bpf_prog_load(union bpf_attr *attr, bpfptr_t uattr)
BPF_F_ANY_ALIGNMENT |
BPF_F_TEST_STATE_FREQ |
BPF_F_SLEEPABLE |
- BPF_F_TEST_RND_HI32))
+ BPF_F_TEST_RND_HI32 |
+ BPF_F_XDP_MB))
return -EINVAL;
if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
@@ -2288,6 +2289,7 @@ static int bpf_prog_load(union bpf_attr *attr, bpfptr_t uattr)
prog->aux->dst_prog = dst_prog;
prog->aux->offload_requested = !!attr->prog_ifindex;
prog->aux->sleepable = attr->prog_flags & BPF_F_SLEEPABLE;
+ prog->aux->xdp_mb = attr->prog_flags & BPF_F_XDP_MB;
err = security_bpf_prog_alloc(prog->aux);
if (err)
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index ba5af15e25f5..d2abb7cff9b5 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -1111,6 +1111,11 @@ enum bpf_link_type {
*/
#define BPF_F_SLEEPABLE (1U << 4)
+/* If BPF_F_XDP_MB is used in BPF_PROG_LOAD command, the loaded program
+ * fully support xdp multi-buffer
+ */
+#define BPF_F_XDP_MB (1U << 5)
+
/* When BPF ldimm64's insn[0].src_reg != 0 then this can have
* the following extensions:
*
--
2.31.1
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