[dpdk-dev] [PATCH v1] net/tap: use local eBPF definitions
Ophir Munk
ophirmu at mellanox.com
Tue Jan 23 22:54:09 CET 2018
eBPF has a graceful approach: it must successfully compile on all Linux
distributions. If a specific kernel cannot support eBPF it will gracefully
refuse the eBPF netlink message sent to it.
The kernel header file linux/bpf.h (if present) on different Linux
distributions may not include all definitions required for TAP
compilation.
In order to guarantee a successful eBPF compilation everywhere all the
required definitions for TAP have been locally added instead of including
file <linux/bpf.h>
Signed-off-by: Ophir Munk <ophirmu at mellanox.com>
---
drivers/net/tap/Makefile | 5 -----
drivers/net/tap/tap_bpf.h | 9 +++++----
2 files changed, 5 insertions(+), 9 deletions(-)
diff --git a/drivers/net/tap/Makefile b/drivers/net/tap/Makefile
index e23c3a2..315c6bd 100644
--- a/drivers/net/tap/Makefile
+++ b/drivers/net/tap/Makefile
@@ -82,11 +82,6 @@ tap_autoconf.h.new: $(RTE_SDK)/buildtools/auto-config-h.sh
linux/tc_act/tc_bpf.h \
enum TCA_ACT_BPF_FD \
$(AUTOCONF_OUTPUT)
- $Q sh -- '$<' '$@' \
- HAVE_BPF_PROG_LOAD \
- linux/bpf.h \
- enum BPF_PROG_LOAD \
- $(AUTOCONF_OUTPUT)
# Create tap_autoconf.h or update it in case it differs from the new one.
diff --git a/drivers/net/tap/tap_bpf.h b/drivers/net/tap/tap_bpf.h
index 30eefb3..8d6f9a2 100644
--- a/drivers/net/tap/tap_bpf.h
+++ b/drivers/net/tap/tap_bpf.h
@@ -7,9 +7,11 @@
#include <tap_autoconf.h>
-#ifdef HAVE_BPF_PROG_LOAD
-#include <linux/bpf.h>
-#else
+/* Do not #include <linux/bpf.h> since eBPF must compile on different
+ * distros which may include partial definitions for eBPF (while the
+ * kernel itself may support eBPF). Instead define here all that is needed
+ */
+
/* BPF_MAP_UPDATE_ELEM command flags */
#define BPF_ANY 0 /* create a new element or update an existing */
@@ -83,7 +85,6 @@ union bpf_attr {
__u32 prog_flags;
};
} __attribute__((aligned(8)));
-#endif
#ifndef __NR_bpf
# if defined(__i386__)
--
2.7.4
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