netdev - [PATCH iproute2-next] Update tc-bpf.8 man page examples

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Date:   Sat, 20 Apr 2019 12:06:18 -0700
From:   Lucas Siba <lucas.siba@...il.com>
To:     netdev@...r.kernel.org
Subject: [PATCH iproute2-next] Update tc-bpf.8 man page examples

From: Lucas Siba @ 2019-04-20 11:40 UTC
To: netdev

This patch updates the tc-bpf.8 example application for changes to the
struct bpf_elf_map definition. In it's current form, things compile, but
the resulting object file is rejected by the verifier when attempting to
load it through tc.

Signed-off-by: Lucas Siba <lucas.siba@...il.com>
---
 man/man8/tc-bpf.8 | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/man/man8/tc-bpf.8 b/man/man8/tc-bpf.8
index b2f9344f..b6cfeab9 100644
--- a/man/man8/tc-bpf.8
+++ b/man/man8/tc-bpf.8
@@ -597,6 +597,8 @@ struct bpf_elf_map __section("maps") map_stats = {
         .size_key       =       sizeof(uint32_t),
         .size_value     =       sizeof(struct tuple),
         .max_elem       =       BPF_MAX_MARK,
+        .pinning        =       PIN_GLOBAL_NS,
+        .flags          =       0,
 };

 static inline void cls_update_stats(const struct __sk_buff *skb,
@@ -709,13 +711,22 @@ in both examples was:
 #define likely(x) __builtin_expect(!!(x), 1)
 #define unlikely(x) __builtin_expect(!!(x), 0)

-/* Used map structure */
+/* Object pinning settings */
+#define PIN_NONE       0
+#define PIN_OBJECT_NS  1
+#define PIN_GLOBAL_NS  2
+
+/* ELF map definition */
 struct bpf_elf_map {
     __u32 type;
     __u32 size_key;
     __u32 size_value;
     __u32 max_elem;
+    __u32 flags;
     __u32 id;
+    __u32 pinning;
+    __u32 inner_id;
+    __u32 inner_idx;
 };

 /* Some used BPF function calls. */
--
In a future patch, it might be worth changing the man page to refer to
"bpf_elf.h" and "uapi/linux/bpf.h" for the definition of structures and
constants, as they may be changed again without the man page being updated.