build: cleanup libpcap dependent components

The RTE_PORT_PCAP variable is used to signal libpcap availability,
though its name seems to refer to pcap support in the port library.
Prefer a generic name and add explicit link dependencies where needed.

Fixes: 7a944656b33f ("test/pcapng: test pcapng library")
Fixes: 2eccf6afbea9 ("bpf: add function to convert classic BPF to DPDK BPF")
Fixes: cbb44143be74 ("app/dumpcap: add new packet capture application")

Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>

app/dumpcap/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2019 Microsoft Corporation
 
-if not dpdk_conf.has('RTE_PORT_PCAP')
+if not dpdk_conf.has('RTE_HAS_LIBPCAP')
     build = false
     reason = 'missing dependency, "libpcap"'
 endif
@@ -12,5 +12,6 @@ if is_windows
     subdir_done()
 endif
 
+ext_deps += pcap_dep
 sources = files('main.c')
 deps += ['ethdev', 'pdump', 'pcapng', 'bpf']

app/test/meson.build

@@ -411,7 +411,8 @@ if dpdk_conf.has('RTE_NET_RING')
     fast_tests += [['pdump_autotest', true]]
 endif
 
-if dpdk_conf.has('RTE_PORT_PCAP')
+if dpdk_conf.has('RTE_HAS_LIBPCAP')
+    ext_deps += pcap_dep
     test_sources += 'test_pcapng.c'
 endif
 
@@ -464,7 +465,7 @@ endif
 dpdk_test = executable('dpdk-test',
         test_sources,
         link_whole: link_libs,
-        dependencies: test_dep_objs,
+        dependencies: test_dep_objs + ext_deps,
         c_args: cflags,
         install_rpath: join_paths(get_option('prefix'),
              driver_install_path),

app/test/test_bpf.c

@@ -3250,7 +3250,7 @@ test_bpf(void)
 
 REGISTER_TEST_COMMAND(bpf_autotest, test_bpf);
 
-#ifdef RTE_PORT_PCAP
+#ifdef RTE_HAS_LIBPCAP
 #include <pcap/pcap.h>
 
 static void
@@ -3447,4 +3447,4 @@ test_bpf_convert(void)
 }
 
 REGISTER_TEST_COMMAND(bpf_convert_autotest, test_bpf_convert);
-#endif /* RTE_PORT_PCAP */
+#endif /* RTE_HAS_LIBPCAP */

config/meson.build

@@ -226,7 +226,7 @@ if not pcap_dep.found()
     pcap_dep = cc.find_library(pcap_lib, required: false)
 endif
 if pcap_dep.found() and cc.has_header('pcap.h', dependencies: pcap_dep)
-    dpdk_conf.set('RTE_PORT_PCAP', 1)
+    dpdk_conf.set('RTE_HAS_LIBPCAP', 1)
     dpdk_extra_ldflags += '-l@0@'.format(pcap_lib)
 endif
 

drivers/net/pcap/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2017 Intel Corporation
 
-if not dpdk_conf.has('RTE_PORT_PCAP')
+if not dpdk_conf.has('RTE_HAS_LIBPCAP')
     build = false
     reason = 'missing dependency, "libpcap"'
 endif

lib/bpf/bpf_stub.c

@@ -27,7 +27,7 @@ rte_bpf_elf_load(const struct rte_bpf_prm *prm, const char *fname,
 }
 #endif
 
-#ifndef RTE_PORT_PCAP
+#ifndef RTE_HAS_LIBPCAP
 struct rte_bpf_prm *
 rte_bpf_convert(const struct bpf_program *prog)
 {

lib/bpf/meson.build

@@ -33,12 +33,12 @@ if dep.found()
     sources += files('bpf_load_elf.c')
     ext_deps += dep
 else
-     warning('libelf is missing, rte_bpf_elf_load API will be disabled')
+    warning('libelf is missing, rte_bpf_elf_load API will be disabled')
 endif
 
-if dpdk_conf.has('RTE_PORT_PCAP')
+if dpdk_conf.has('RTE_HAS_LIBPCAP')
     sources += files('bpf_convert.c')
     ext_deps += pcap_dep
 else
-     warning('RTE_PORT_PCAP is missing, rte_bpf_convert API will be disabled')
+    warning('libpcap is missing, rte_bpf_convert API will be disabled')
 endif

lib/port/meson.build

@@ -41,7 +41,8 @@ headers = files(
 )
 deps += ['ethdev', 'sched', 'ip_frag', 'cryptodev', 'eventdev']
 
-if dpdk_conf.has('RTE_PORT_PCAP')
+if dpdk_conf.has('RTE_HAS_LIBPCAP')
+    dpdk_conf.set('RTE_PORT_PCAP', 1)
     ext_deps += pcap_dep # dependency provided in config/meson.build
 endif