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[ovs-dev,RFC,1/2] RFC: Add basic xdp/eBPF support in OVN.

Message ID 20220531004613.3873477-1-numans@ovn.org
State RFC
Headers show
Series Basic eBPF/XDP support in OVN. | expand

Commit Message

Numan Siddique May 31, 2022, 12:46 a.m. UTC 
From: Numan Siddique <numans@ovn.org>

This patch just adds an xdp program and the support in the Makefile
to compile it.  A separate target is added in the Makefile.
To compile, user has to run: 'make bpf'.

Signed-off-by: Numan Siddique <numans@ovn.org>
---
 Makefile.am     |  6 +++++-
 bpf/.gitignore  |  5 +++++
 bpf/automake.mk | 23 +++++++++++++++++++++++
 bpf/ovn_xdp.c   | 11 +++++++++++
 4 files changed, 44 insertions(+), 1 deletion(-)
 create mode 100644 bpf/.gitignore
 create mode 100644 bpf/automake.mk
 create mode 100644 bpf/ovn_xdp.c
diff mbox series

Patch

diff --git a/Makefile.am b/Makefile.am
index 3b0df83938..518be9c101 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -120,6 +120,7 @@  dist_pkgdata_SCRIPTS =
 dist_sbin_SCRIPTS =
 dist_scripts_SCRIPTS =
 dist_scripts_DATA =
+dist_bpf_DATA =
 EXTRA_PROGRAMS =
 INSTALL_DATA_LOCAL =
 UNINSTALL_LOCAL =
@@ -139,6 +140,7 @@  sbin_SCRIPTS =
 scripts_SCRIPTS =
 completion_SCRIPTS =
 scripts_DATA =
+bpf_DATA =
 SUFFIXES =
 check_DATA =
 check_SCRIPTS =
@@ -152,6 +154,7 @@  endif
 scriptsdir = $(pkgdatadir)/scripts
 completiondir = $(sysconfdir)/bash_completion.d
 pkgconfigdir = $(libdir)/pkgconfig
+bpfdir = $(pkgdatadir)/bpf
 
 # This ensures that files added to EXTRA_DIST are always distributed,
 # even if they are inside an Automake if...endif conditional block that is
@@ -255,7 +258,7 @@  config-h-check:
 	@cd $(srcdir); \
 	if test -e .git && (git --version) >/dev/null 2>&1 && \
 	  git --no-pager grep -L '#include <config\.h>' `git ls-files | grep -v $(submodules) | grep '\.c$$' | \
-	    grep -vE '^python'`; \
+	    grep -vE '^bpf|^python'`; \
 	then \
 	  echo "See above for list of violations of the rule that"; \
 	  echo "every C source file must #include <config.h>."; \
@@ -493,6 +496,7 @@  include debian/automake.mk
 include lib/ovsdb_automake.mk
 include rhel/automake.mk
 include tutorial/automake.mk
+include bpf/automake.mk
 include controller/automake.mk
 include controller-vtep/automake.mk
 include northd/automake.mk
diff --git a/bpf/.gitignore b/bpf/.gitignore
new file mode 100644
index 0000000000..b0f4f8eaff
--- /dev/null
+++ b/bpf/.gitignore
@@ -0,0 +1,5 @@ 
+/Makefile
+/Makefile.in
+*.o
+/distfiles
+
diff --git a/bpf/automake.mk b/bpf/automake.mk
new file mode 100644
index 0000000000..7c44682335
--- /dev/null
+++ b/bpf/automake.mk
@@ -0,0 +1,23 @@ 
+bpf_sources = bpf/ovn_xdp.c
+bpf_headers =
+bpf_extra =
+
+dist_sources = $(bpf_sources)
+dist_headers = $(bpf_headers)
+build_sources = $(dist_sources)
+build_headers = $(dist_headers)
+build_objects = $(patsubst %.c,%.o,$(build_sources))
+
+LLC ?=  llc
+CLANG ?= clang
+
+bpf: $(build_objects)
+bpf/ovn_xdp.o: $(bpf_sources) $(bpf_headers)
+	$(MKDIR_P) $(dir $@)
+	@which $(CLANG) >/dev/null 2>&1 || \
+		(echo "Unable to find clang, Install clang (>=3.7) package"; exit 1)
+	$(AM_V_CC) $(CLANG) -O3 -c $< -o - -emit-llvm | \
+	$(LLC) -march=bpf - -filetype=obj -o $@
+
+
+EXTRA_DIST += $(dist_sources) $(dist_headers) $(bpf_extra)
diff --git a/bpf/ovn_xdp.c b/bpf/ovn_xdp.c
new file mode 100644
index 0000000000..9515a1d1bf
--- /dev/null
+++ b/bpf/ovn_xdp.c
@@ -0,0 +1,11 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+
+SEC("xdp")
+int  xdp_ovn_vif(struct xdp_md *xdp)
+{
+    return XDP_PASS;
+}
+
+char _license[] SEC("license") = "GPL";