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Since /sys is unavailable in build environments, the list of available
TCP network interfaces cannot be obtained via /sys/class/net. This patch
provides alternative code that uses the SIOCGIFCONF ioctl to get the
names of the available TCP network interfaces.
diff --git a/src/uct/tcp/tcp_iface.c b/src/uct/tcp/tcp_iface.c
index cad4a2709..7c1d2c9de 100644
--- a/src/uct/tcp/tcp_iface.c
+++ b/src/uct/tcp/tcp_iface.c
@@ -17,6 +17,8 @@
#include <sys/poll.h>
#include <netinet/tcp.h>
#include <dirent.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
extern ucs_class_t UCS_CLASS_DECL_NAME(uct_tcp_iface_t);
@@ -586,6 +588,68 @@ static UCS_CLASS_DEFINE_NEW_FUNC(uct_tcp_iface_t, uct_iface_t, uct_md_h,
uct_worker_h, const uct_iface_params_t*,
const uct_iface_config_t*);
+/* Fetch information about available network devices through an ioctl. */
+static ucs_status_t query_devices_ioctl(uct_md_h md,
+ uct_tl_device_resource_t **tl_devices_p,
+ unsigned *num_tl_devices_p)
+{
+ int sock, err, i;
+ uct_tl_device_resource_t *resources, *tmp;
+ unsigned num_resources;
+ ucs_status_t status;
+ struct ifconf conf;
+ struct ifreq reqs[10];
+
+ conf.ifc_len = sizeof reqs;
+ conf.ifc_req = reqs;
+
+ sock = socket(SOCK_STREAM, AF_INET, 0);
+ if (sock < 0) {
+ ucs_error("socket(2) failed: %m");
+ status = UCS_ERR_IO_ERROR;
+ goto out;
+ }
+
+ err = ioctl(sock, SIOCGIFCONF, &conf);
+ if (err < 0) {
+ ucs_error("SIOCGIFCONF ioctl failed: %m");
+ status = UCS_ERR_IO_ERROR;
+ goto out;
+ }
+
+ resources = NULL;
+ num_resources = 0;
+ for (i = 0; i < conf.ifc_len / sizeof(struct ifreq); i++) {
+ const char *name = reqs[i].ifr_name;
+
+ if (!ucs_netif_is_active(name)) {
+ continue;
+ }
+
+ tmp = ucs_realloc(resources, sizeof(*resources) * (num_resources + 1),
+ "tcp resources");
+ if (tmp == NULL) {
+ ucs_free(resources);
+ status = UCS_ERR_NO_MEMORY;
+ goto out;
+ }
+ resources = tmp;
+
+ ucs_snprintf_zero(resources[i].name, sizeof(resources[i].name),
+ "%s", name);
+ resources[i].type = UCT_DEVICE_TYPE_NET;
+ ++num_resources;
+ }
+
+ *num_tl_devices_p = num_resources;
+ *tl_devices_p = resources;
+ status = UCS_OK;
+
+out:
+ if (sock >= 0) close(sock);
+ return status;
+}
+
ucs_status_t uct_tcp_query_devices(uct_md_h md,
uct_tl_device_resource_t **devices_p,
unsigned *num_devices_p)
@@ -599,9 +663,9 @@ ucs_status_t uct_tcp_query_devices(uct_md_h md,
dir = opendir(netdev_dir);
if (dir == NULL) {
- ucs_error("opendir(%s) failed: %m", netdev_dir);
- status = UCS_ERR_IO_ERROR;
- goto out;
+ /* When /sys is unavailable, as can be the case in a container,
+ * resort to a good old 'ioctl'. */
+ return query_devices_ioctl(md, devices_p, num_devices_p);
}
devices = NULL;
@@ -655,7 +719,6 @@ ucs_status_t uct_tcp_query_devices(uct_md_h md,
out_closedir:
closedir(dir);
-out:
return status;
}
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