[dpdk-dev] [PATCH 3/6] net/pcap: move OS-dependent code to separate files

[Dmitry Kozlyuk]

PCAP PMD queries interface information differently for Linux and
FreeBSD, OS-specific code is guarded by #ifdef. In preparation to add
Windows-specific part and libpcap wrapper, extract OS-independent
interface and move implementations to separate files. Rename
rte_eth_pcap.c to pcap_ethdev.c for consistency with the rest of DPDK.

Signed-off-by: Dmitry Kozlyuk <dmitry.kozliuk at gmail.com>
---
 drivers/net/pcap/meson.build                  |  5 +-
 .../pcap/{rte_eth_pcap.c => pcap_ethdev.c}    | 88 ++-----------------
 drivers/net/pcap/pcap_osdep.h                 | 17 ++++
 drivers/net/pcap/pcap_osdep_freebsd.c         | 59 +++++++++++++
 drivers/net/pcap/pcap_osdep_linux.c           | 42 +++++++++
 5 files changed, 130 insertions(+), 81 deletions(-)
 rename drivers/net/pcap/{rte_eth_pcap.c => pcap_ethdev.c} (95%)
 create mode 100644 drivers/net/pcap/pcap_osdep.h
 create mode 100644 drivers/net/pcap/pcap_osdep_freebsd.c
 create mode 100644 drivers/net/pcap/pcap_osdep_linux.c

diff --git a/drivers/net/pcap/meson.build b/drivers/net/pcap/meson.build
index b65d91e70..26b606699 100644
--- a/drivers/net/pcap/meson.build
+++ b/drivers/net/pcap/meson.build
@@ -11,5 +11,8 @@ if not dpdk_conf.has('RTE_PORT_PCAP')
 	build = false
 	reason = 'missing dependency, "libpcap"'
 endif
-sources = files('rte_eth_pcap.c')
+sources = files(
+	'pcap_ethdev.c',
+	'pcap_osdep_ at 0@.c'.format(exec_env),
+)
 ext_deps += pcap_dep
diff --git a/drivers/net/pcap/rte_eth_pcap.c b/drivers/net/pcap/pcap_ethdev.c
similarity index 95%
rename from drivers/net/pcap/rte_eth_pcap.c
rename to drivers/net/pcap/pcap_ethdev.c
index 176928da3..a102897e9 100644
--- a/drivers/net/pcap/rte_eth_pcap.c
+++ b/drivers/net/pcap/pcap_ethdev.c
@@ -6,16 +6,6 @@
 
 #include <time.h>
 
-#include <net/if.h>
-#include <sys/socket.h>
-#include <sys/ioctl.h>
-#include <unistd.h>
-
-#if defined(RTE_EXEC_ENV_FREEBSD)
-#include <sys/sysctl.h>
-#include <net/if_dl.h>
-#endif
-
 #include <pcap.h>
 
 #include <rte_cycles.h>
@@ -25,7 +15,8 @@
 #include <rte_malloc.h>
 #include <rte_mbuf.h>
 #include <rte_bus_vdev.h>
-#include <rte_string_fns.h>
+
+#include "pcap_osdep.h"
 
 #define RTE_ETH_PCAP_SNAPSHOT_LEN 65535
 #define RTE_ETH_PCAP_SNAPLEN RTE_ETHER_MAX_JUMBO_FRAME_LEN
@@ -1191,84 +1182,20 @@ static int
 eth_pcap_update_mac(const char *if_name, struct rte_eth_dev *eth_dev,
 		const unsigned int numa_node)
 {
-#if defined(RTE_EXEC_ENV_LINUX)
 	void *mac_addrs;
-	struct ifreq ifr;
-	int if_fd = socket(AF_INET, SOCK_DGRAM, 0);
-
-	if (if_fd == -1)
-		return -1;
+	struct rte_ether_addr mac;
 
-	rte_strscpy(ifr.ifr_name, if_name, sizeof(ifr.ifr_name));
-	if (ioctl(if_fd, SIOCGIFHWADDR, &ifr)) {
-		close(if_fd);
+	if (osdep_iface_mac_get(if_name, &mac) < 0)
 		return -1;
-	}
 
 	mac_addrs = rte_zmalloc_socket(NULL, RTE_ETHER_ADDR_LEN, 0, numa_node);
-	if (!mac_addrs) {
-		close(if_fd);
+	if (mac_addrs == NULL)
 		return -1;
-	}
 
 	PMD_LOG(INFO, "Setting phy MAC for %s", if_name);
+	rte_memcpy(mac_addrs, mac.addr_bytes, RTE_ETHER_ADDR_LEN);
 	eth_dev->data->mac_addrs = mac_addrs;
-	rte_memcpy(eth_dev->data->mac_addrs[0].addr_bytes,
-			ifr.ifr_hwaddr.sa_data, RTE_ETHER_ADDR_LEN);
-
-	close(if_fd);
-
-	return 0;
-
-#elif defined(RTE_EXEC_ENV_FREEBSD)
-	void *mac_addrs;
-	struct if_msghdr *ifm;
-	struct sockaddr_dl *sdl;
-	int mib[6];
-	size_t len = 0;
-	char *buf;
-
-	mib[0] = CTL_NET;
-	mib[1] = AF_ROUTE;
-	mib[2] = 0;
-	mib[3] = AF_LINK;
-	mib[4] = NET_RT_IFLIST;
-	mib[5] = if_nametoindex(if_name);
-
-	if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
-		return -1;
-
-	if (len == 0)
-		return -1;
-
-	buf = rte_malloc(NULL, len, 0);
-	if (!buf)
-		return -1;
-
-	if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
-		rte_free(buf);
-		return -1;
-	}
-	ifm = (struct if_msghdr *)buf;
-	sdl = (struct sockaddr_dl *)(ifm + 1);
-
-	mac_addrs = rte_zmalloc_socket(NULL, RTE_ETHER_ADDR_LEN, 0, numa_node);
-	if (!mac_addrs) {
-		rte_free(buf);
-		return -1;
-	}
-
-	PMD_LOG(INFO, "Setting phy MAC for %s", if_name);
-	eth_dev->data->mac_addrs = mac_addrs;
-	rte_memcpy(eth_dev->data->mac_addrs[0].addr_bytes,
-			LLADDR(sdl), RTE_ETHER_ADDR_LEN);
-
-	rte_free(buf);
-
 	return 0;
-#else
-	return -1;
-#endif
 }
 
 static int
@@ -1330,7 +1257,8 @@ eth_from_pcaps(struct rte_vdev_device *vdev,
 	internals->single_iface = single_iface;
 
 	if (single_iface) {
-		internals->if_index = if_nametoindex(rx_queues->queue[0].name);
+		internals->if_index =
+			osdep_iface_index_get(rx_queues->queue[0].name);
 
 		/* phy_mac arg is applied only only if "iface" devarg is provided */
 		if (rx_queues->phy_mac) {
diff --git a/drivers/net/pcap/pcap_osdep.h b/drivers/net/pcap/pcap_osdep.h
new file mode 100644
index 000000000..46810d86f
--- /dev/null
+++ b/drivers/net/pcap/pcap_osdep.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright (c) 2021 Dmitry Kozlyuk
+ */
+
+#ifndef _RTE_PCAP_OSDEP_
+#define _RTE_PCAP_OSDEP_
+
+#include <rte_ether.h>
+
+/*
+ * Interface manipulation is always OS-specific.
+ */
+
+int osdep_iface_index_get(const char *name);
+int osdep_iface_mac_get(const char *name, struct rte_ether_addr *mac);
+
+#endif
diff --git a/drivers/net/pcap/pcap_osdep_freebsd.c b/drivers/net/pcap/pcap_osdep_freebsd.c
new file mode 100644
index 000000000..20556b3e9
--- /dev/null
+++ b/drivers/net/pcap/pcap_osdep_freebsd.c
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2016 Intel Corporation.
+ * Copyright(c) 2014 6WIND S.A.
+ * All rights reserved.
+ */
+
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <sys/sysctl.h>
+
+#include <rte_malloc.h>
+#include <rte_memcpy.h>
+
+#include "pcap_osdep.h"
+
+int
+osdep_iface_index_get(const char *name)
+{
+	return if_nametoindex(name);
+}
+
+int
+osdep_iface_mac_get(const char *if_name, struct rte_ether_addr *mac)
+{
+	struct if_msghdr *ifm;
+	struct sockaddr_dl *sdl;
+	int mib[6];
+	size_t len = 0;
+	char *buf;
+
+	mib[0] = CTL_NET;
+	mib[1] = AF_ROUTE;
+	mib[2] = 0;
+	mib[3] = AF_LINK;
+	mib[4] = NET_RT_IFLIST;
+	mib[5] = if_nametoindex(if_name);
+
+	if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
+		return -1;
+
+	if (len == 0)
+		return -1;
+
+	buf = rte_malloc(NULL, len, 0);
+	if (!buf)
+		return -1;
+
+	if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
+		rte_free(buf);
+		return -1;
+	}
+	ifm = (struct if_msghdr *)buf;
+	sdl = (struct sockaddr_dl *)(ifm + 1);
+
+	rte_memcpy(mac->addr_bytes, LLADDR(sdl), RTE_ETHER_ADDR_LEN);
+
+	rte_free(buf);
+	return 0;
+}
diff --git a/drivers/net/pcap/pcap_osdep_linux.c b/drivers/net/pcap/pcap_osdep_linux.c
new file mode 100644
index 000000000..97033f57c
--- /dev/null
+++ b/drivers/net/pcap/pcap_osdep_linux.c
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2016 Intel Corporation.
+ * Copyright(c) 2014 6WIND S.A.
+ * All rights reserved.
+ */
+
+#include <net/if.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include <rte_memcpy.h>
+#include <rte_string_fns.h>
+
+#include "pcap_osdep.h"
+
+int
+osdep_iface_index_get(const char *name)
+{
+	return if_nametoindex(name);
+}
+
+int
+osdep_iface_mac_get(const char *if_name, struct rte_ether_addr *mac)
+{
+	struct ifreq ifr;
+	int if_fd = socket(AF_INET, SOCK_DGRAM, 0);
+
+	if (if_fd == -1)
+		return -1;
+
+	rte_strscpy(ifr.ifr_name, if_name, sizeof(ifr.ifr_name));
+	if (ioctl(if_fd, SIOCGIFHWADDR, &ifr)) {
+		close(if_fd);
+		return -1;
+	}
+
+	rte_memcpy(mac->addr_bytes, ifr.ifr_hwaddr.sa_data, RTE_ETHER_ADDR_LEN);
+
+	close(if_fd);
+	return 0;
+}
-- 
2.29.2