RDMA MAD kernel module (ibcm) disallow more than one MAD-agent for a
given MAD class.
This does not go hand-by-hand with qemu pvrdma device's requirements
where each VM is MAD agent.
Fix it by adding implementation of RDMA MAD multiplexer service which on
one hand register as a sole MAD agent with the kernel module and on the
other hand gives service to more than one VM.
Design Overview:
----------------
A server process is registered to UMAD framework (for this to work the
rdma_cm kernel module needs to be unloaded) and creates a unix socket to
listen to incoming request from clients.
A client process (such as QEMU) connects to this unix socket and
registers with its own GID.
TX:
---
When client needs to send rdma_cm MAD message it construct it the same
way as without this multiplexer, i.e. creates a umad packet but this
time it writes its content to the socket instead of calling umad_send().
The server, upon receiving such a message fetch local_comm_id from it so
a context for this session can be maintain and relay the message to UMAD
layer by calling umad_send().
RX:
---
The server creates a worker thread to process incoming rdma_cm MAD
messages. When an incoming message arrived (umad_recv()) the server,
depending on the message type (attr_id) looks for target client by
either searching in gid->fd table or in local_comm_id->fd table. With
the extracted fd the server relays to incoming message to the client.
Signed-off-by: Yuval Shaia <yuval.sh...@oracle.com>
---
MAINTAINERS | 1 +
Makefile | 3 +
Makefile.objs | 1 +
contrib/rdmacm-mux/Makefile.objs | 4 +
contrib/rdmacm-mux/main.c | 770 +++++++++++++++++++++++++++++++
contrib/rdmacm-mux/rdmacm-mux.h | 56 +++
6 files changed, 835 insertions(+)
create mode 100644 contrib/rdmacm-mux/Makefile.objs
create mode 100644 contrib/rdmacm-mux/main.c
create mode 100644 contrib/rdmacm-mux/rdmacm-mux.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 98a1856afc..e087d58ac6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2231,6 +2231,7 @@ S: Maintained
F: hw/rdma/*
F: hw/rdma/vmw/*
F: docs/pvrdma.txt
+F: contrib/rdmacm-mux/*
Build and test automation
-------------------------
diff --git a/Makefile b/Makefile
index f2947186a4..94072776ff 100644
--- a/Makefile
+++ b/Makefile
@@ -418,6 +418,7 @@ dummy := $(call unnest-vars,, \
elf2dmp-obj-y \
ivshmem-client-obj-y \
ivshmem-server-obj-y \
+ rdmacm-mux-obj-y \
libvhost-user-obj-y \
vhost-user-scsi-obj-y \
vhost-user-blk-obj-y \
@@ -725,6 +726,8 @@ vhost-user-scsi$(EXESUF): $(vhost-user-scsi-obj-y)
libvhost-user.a
$(call LINK, $^)
vhost-user-blk$(EXESUF): $(vhost-user-blk-obj-y) libvhost-user.a
$(call LINK, $^)
+rdmacm-mux$(EXESUF): $(rdmacm-mux-obj-y) $(COMMON_LDADDS)
+ $(call LINK, $^)
module_block.h: $(SRC_PATH)/scripts/modules/module_block.py config-host.mak
$(call quiet-command,$(PYTHON) $< $@ \
diff --git a/Makefile.objs b/Makefile.objs
index 1e1ff387d7..cc7df3ad80 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -194,6 +194,7 @@ vhost-user-scsi.o-cflags := $(LIBISCSI_CFLAGS)
vhost-user-scsi.o-libs := $(LIBISCSI_LIBS)
vhost-user-scsi-obj-y = contrib/vhost-user-scsi/
vhost-user-blk-obj-y = contrib/vhost-user-blk/
+rdmacm-mux-obj-y = contrib/rdmacm-mux/
######################################################################
trace-events-subdirs =
diff --git a/contrib/rdmacm-mux/Makefile.objs b/contrib/rdmacm-mux/Makefile.objs
new file mode 100644
index 0000000000..be3eacb6f7
--- /dev/null
+++ b/contrib/rdmacm-mux/Makefile.objs
@@ -0,0 +1,4 @@
+ifdef CONFIG_PVRDMA
+CFLAGS += -libumad -Wno-format-truncation
+rdmacm-mux-obj-y = main.o
+endif
diff --git a/contrib/rdmacm-mux/main.c b/contrib/rdmacm-mux/main.c
new file mode 100644
index 0000000000..0308074b15
--- /dev/null
+++ b/contrib/rdmacm-mux/main.c
@@ -0,0 +1,770 @@
+/*
+ * QEMU paravirtual RDMA - rdmacm-mux implementation
+ *
+ * Copyright (C) 2018 Oracle
+ * Copyright (C) 2018 Red Hat Inc
+ *
+ * Authors:
+ * Yuval Shaia <yuval.sh...@oracle.com>
+ * Marcel Apfelbaum <mar...@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "sys/poll.h"
+#include "sys/ioctl.h"
+#include "pthread.h"
+#include "syslog.h"
+
+#include "infiniband/verbs.h"
+#include "infiniband/umad.h"
+#include "infiniband/umad_types.h"
+#include "infiniband/umad_sa.h"
+#include "infiniband/umad_cm.h"
+
+#include "rdmacm-mux.h"
+
+#define SCALE_US 1000
+#define COMMID_TTL 2 /* How many SCALE_US a context of MAD session is saved */
+#define SLEEP_SECS 5 /* This is used both in poll() and thread */
+#define SERVER_LISTEN_BACKLOG 10
+#define MAX_CLIENTS 4096
+#define MAD_RMPP_VERSION 0
+#define MAD_METHOD_MASK0 0x8
+
+#define IB_USER_MAD_LONGS_PER_METHOD_MASK (128 / (8 * sizeof(long)))
+
+#define CM_REQ_DGID_POS 80
+#define CM_SIDR_REQ_DGID_POS 44
+
+/* The below can be override by command line parameter */
+#define UNIX_SOCKET_PATH "/var/run/rdmacm-mux"
+#define RDMA_DEVICE "rxe0"
+#define RDMA_PORT_NUM 1
+
+typedef struct RdmaCmServerArgs {
+ char unix_socket_path[PATH_MAX];
+ char rdma_dev_name[NAME_MAX];
+ int rdma_port_num;
+} RdmaCMServerArgs;
+
+typedef struct CommId2FdEntry {
+ int fd;
+ int ttl; /* Initialized to 2, decrement each timeout, entry delete when 0
*/
+ __be64 gid_ifid;
+} CommId2FdEntry;
+
+typedef struct RdmaCmUMadAgent {
+ int port_id;
+ int agent_id;
+ GHashTable *gid2fd; /* Used to find fd of a given gid */
+ GHashTable *commid2fd; /* Used to find fd on of a given comm_id */
+} RdmaCmUMadAgent;
+
+typedef struct RdmaCmServer {
+ bool run;
+ RdmaCMServerArgs args;
+ struct pollfd fds[MAX_CLIENTS];
+ int nfds;
+ RdmaCmUMadAgent umad_agent;
+ pthread_t umad_recv_thread;
+ pthread_rwlock_t lock;
+} RdmaCMServer;
+
+RdmaCMServer server = {0};
+
+static void usage(const char *progname)
+{
+ printf("Usage: %s [OPTION]...\n"
+ "Start a RDMA-CM multiplexer\n"
+ "\n"
+ "\t-h Show this help\n"
+ "\t-s unix-socket-path Path to unix socket to listen on (default
%s)\n"
+ "\t-d rdma-device-name Name of RDMA device to register with
(default %s)\n"
+ "\t-p rdma-device-port Port number of RDMA device to register
with (default %d)\n",
+ progname, UNIX_SOCKET_PATH, RDMA_DEVICE, RDMA_PORT_NUM);
+}
+
+static void help(const char *progname)
+{
+ fprintf(stderr, "Try '%s -h' for more information.\n", progname);
+}
+
+static void parse_args(int argc, char *argv[])
+{
+ int c;
+ char unix_socket_path[PATH_MAX];
+
+ strcpy(unix_socket_path, UNIX_SOCKET_PATH);
+ strncpy(server.args.rdma_dev_name, RDMA_DEVICE, NAME_MAX - 1);
+ server.args.rdma_port_num = RDMA_PORT_NUM;
+
+ while ((c = getopt(argc, argv, "hs:d:p:")) != -1) {
+ switch (c) {
+ case 'h':
+ usage(argv[0]);
+ exit(0);
+
+ case 's':
+ /* This is temporary, final name will build below */
+ strncpy(unix_socket_path, optarg, PATH_MAX);
+ break;
+
+ case 'd':
+ strncpy(server.args.rdma_dev_name, optarg, NAME_MAX - 1);
+ break;
+
+ case 'p':
+ server.args.rdma_port_num = atoi(optarg);
+ break;
+
+ default:
+ help(argv[0]);
+ exit(1);
+ }
+ }
+
+ /* Build unique unix-socket file name */
+ snprintf(server.args.unix_socket_path, PATH_MAX, "%s-%s-%d",
+ unix_socket_path, server.args.rdma_dev_name,
+ server.args.rdma_port_num);
+
+ syslog(LOG_INFO, "unix_socket_path=%s", server.args.unix_socket_path);
+ syslog(LOG_INFO, "rdma-device-name=%s", server.args.rdma_dev_name);
+ syslog(LOG_INFO, "rdma-device-port=%d", server.args.rdma_port_num);
+}
+
+static void hash_tbl_alloc(void)
+{
+
+ server.umad_agent.gid2fd = g_hash_table_new_full(g_int64_hash,
+ g_int64_equal,
+ g_free, g_free);
+ server.umad_agent.commid2fd = g_hash_table_new_full(g_int_hash,
+ g_int_equal,
+ g_free, g_free);
+}
+
+static void hash_tbl_free(void)
+{
+ if (server.umad_agent.commid2fd) {
+ g_hash_table_destroy(server.umad_agent.commid2fd);
+ }
+ if (server.umad_agent.gid2fd) {
+ g_hash_table_destroy(server.umad_agent.gid2fd);
+ }
+}
+
+
+static int _hash_tbl_search_fd_by_ifid(__be64 *gid_ifid)
+{
+ int *fd;
+
+ fd = g_hash_table_lookup(server.umad_agent.gid2fd, gid_ifid);
+ if (!fd) {
+ /* Let's try IPv4 */
+ *gid_ifid |= 0x00000000ffff0000;
+ fd = g_hash_table_lookup(server.umad_agent.gid2fd, gid_ifid);
+ }
+
+ return fd ? *fd : 0;
+}
+
+static int hash_tbl_search_fd_by_ifid(int *fd, __be64 *gid_ifid)
+{
+ pthread_rwlock_rdlock(&server.lock);
+ *fd = _hash_tbl_search_fd_by_ifid(gid_ifid);
+ pthread_rwlock_unlock(&server.lock);
+
+ if (!fd) {
+ syslog(LOG_WARNING, "Can't find matching for ifid 0x%llx\n",
*gid_ifid);
+ return -ENOENT;
+ }
+
+ return 0;
+}
+
+static int hash_tbl_search_fd_by_comm_id(uint32_t comm_id, int *fd,
+ __be64 *gid_idid)
+{
+ CommId2FdEntry *fde;
+
+ pthread_rwlock_rdlock(&server.lock);
+ fde = g_hash_table_lookup(server.umad_agent.commid2fd, &comm_id);
+ pthread_rwlock_unlock(&server.lock);
+
+ if (!fde) {
+ syslog(LOG_WARNING, "Can't find matching for comm_id 0x%x\n", comm_id);
+ return -ENOENT;
+ }
+
+ *fd = fde->fd;
+ *gid_idid = fde->gid_ifid;
+
+ return 0;
+}
+
+static RdmaCmMuxErrCode add_fd_ifid_pair(int fd, __be64 gid_ifid)
+{
+ int fd1;
+
+ pthread_rwlock_wrlock(&server.lock);
+
+ fd1 = _hash_tbl_search_fd_by_ifid(&gid_ifid);
+ if (fd1) { /* record already exist - an error */
+ pthread_rwlock_unlock(&server.lock);
+ return fd == fd1 ? RDMACM_MUX_ERR_CODE_EEXIST :
+ RDMACM_MUX_ERR_CODE_EACCES;
+ }
+
+ g_hash_table_insert(server.umad_agent.gid2fd, g_memdup(&gid_ifid,
+ sizeof(gid_ifid)), g_memdup(&fd, sizeof(fd)));
+
+ pthread_rwlock_unlock(&server.lock);
+
+ syslog(LOG_INFO, "0x%lx registered on socket %d", (uint64_t)gid_ifid, fd);
+
+ return RDMACM_MUX_ERR_CODE_OK;
+}
+
+static RdmaCmMuxErrCode delete_fd_ifid_pair(int fd, __be64 gid_ifid)
+{
+ int fd1;
+
+ pthread_rwlock_wrlock(&server.lock);
+
+ fd1 = _hash_tbl_search_fd_by_ifid(&gid_ifid);
+ if (!fd1) { /* record not exist - an error */
+ pthread_rwlock_unlock(&server.lock);
+ return RDMACM_MUX_ERR_CODE_ENOTFOUND;
+ }
+
+ g_hash_table_remove(server.umad_agent.gid2fd, g_memdup(&gid_ifid,
+ sizeof(gid_ifid)));
+ pthread_rwlock_unlock(&server.lock);
+
+ syslog(LOG_INFO, "0x%lx unregistered on socket %d", (uint64_t)gid_ifid,
fd);
+
+ return RDMACM_MUX_ERR_CODE_OK;
+}
+
+static void hash_tbl_save_fd_comm_id_pair(int fd, uint32_t comm_id,
+ uint64_t gid_ifid)
+{
+ CommId2FdEntry fde = {fd, COMMID_TTL, gid_ifid};
+
+ pthread_rwlock_wrlock(&server.lock);
+ g_hash_table_insert(server.umad_agent.commid2fd,
+ g_memdup(&comm_id, sizeof(comm_id)),
+ g_memdup(&fde, sizeof(fde)));
+ pthread_rwlock_unlock(&server.lock);
+}
+
+static gboolean remove_old_comm_ids(gpointer key, gpointer value,
+ gpointer user_data)
+{
+ CommId2FdEntry *fde = (CommId2FdEntry *)value;
+
+ return !fde->ttl--;
+}
+
+static gboolean remove_entry_from_gid2fd(gpointer key, gpointer value,
+ gpointer user_data)
+{
+ if (*(int *)value == *(int *)user_data) {
+ syslog(LOG_INFO, "0x%lx unregistered on socket %d", *(uint64_t *)key,
+ *(int *)value);
+ return true;
+ }
+
+ return false;
+}
+
+static void hash_tbl_remove_fd_ifid_pair(int fd)
+{
+ pthread_rwlock_wrlock(&server.lock);
+ g_hash_table_foreach_remove(server.umad_agent.gid2fd,
+ remove_entry_from_gid2fd, (gpointer)&fd);
+ pthread_rwlock_unlock(&server.lock);
+}
+
+static int get_fd(const char *mad, int *fd, __be64 *gid_ifid)
+{
+ struct umad_hdr *hdr = (struct umad_hdr *)mad;
+ char *data = (char *)hdr + sizeof(*hdr);
+ int32_t comm_id;
+ uint16_t attr_id = be16toh(hdr->attr_id);
+ int rc = 0;
+
+ switch (attr_id) {
+ case UMAD_CM_ATTR_REQ:
+ memcpy(gid_ifid, data + CM_REQ_DGID_POS, sizeof(*gid_ifid));
+ rc = hash_tbl_search_fd_by_ifid(fd, gid_ifid);
+ break;
+
+ case UMAD_CM_ATTR_SIDR_REQ:
+ memcpy(gid_ifid, data + CM_SIDR_REQ_DGID_POS, sizeof(*gid_ifid));
+ rc = hash_tbl_search_fd_by_ifid(fd, gid_ifid);
+ break;
+
+ case UMAD_CM_ATTR_REP:
+ /* Fall through */
+ case UMAD_CM_ATTR_REJ:
+ /* Fall through */
+ case UMAD_CM_ATTR_DREQ:
+ /* Fall through */
+ case UMAD_CM_ATTR_DREP:
+ /* Fall through */
+ case UMAD_CM_ATTR_RTU:
+ data += sizeof(comm_id);
+ /* Fall through */
+ case UMAD_CM_ATTR_SIDR_REP:
+ memcpy(&comm_id, data, sizeof(comm_id));
+ if (comm_id) {
+ rc = hash_tbl_search_fd_by_comm_id(comm_id, fd, gid_ifid);
+ }
+ break;
+
+ default:
+ rc = -EINVAL;
+ syslog(LOG_WARNING, "Unsupported attr_id 0x%x\n", attr_id);
+ }
+
+ return rc;
+}
+
+static void *umad_recv_thread_func(void *args)
+{
+ int rc;
+ RdmaCmMuxMsg msg = {0};
+ int fd = -2;
+
+ while (server.run) {
+ do {
+ msg.umad_len = sizeof(msg.umad.mad);
+ rc = umad_recv(server.umad_agent.port_id, &msg.umad, &msg.umad_len,
+ SLEEP_SECS * SCALE_US);
+ if ((rc == -EIO) || (rc == -EINVAL)) {
+ syslog(LOG_CRIT, "Fatal error while trying to read MAD");
+ }
+
+ if (rc == -ETIMEDOUT) {
+ g_hash_table_foreach_remove(server.umad_agent.commid2fd,
+ remove_old_comm_ids, NULL);
+ }
+ } while (rc && server.run);
+
+ if (server.run) {
+ rc = get_fd(msg.umad.mad, &fd, &msg.hdr.sgid.global.interface_id);
+ if (rc) {
+ continue;
+ }
+
+ send(fd, &msg, sizeof(msg), 0);
+ }
+ }
+
+ return NULL;
+}
+
+static int read_and_process(int fd)
+{
+ int rc;
+ RdmaCmMuxMsg msg = {0};
+ struct umad_hdr *hdr;
+ uint32_t *comm_id;
+ uint16_t attr_id;
+
+ rc = recv(fd, &msg, sizeof(msg), 0);
+
+ if (rc < 0 && errno != EWOULDBLOCK) {
+ return -EIO;
+ }
+
+ if (!rc) {
+ return -EPIPE;
+ }
+
+ switch (msg.hdr.msg_type) {
+ case RDMACM_MUX_MSG_TYPE_REG:
+ rc = add_fd_ifid_pair(fd, msg.hdr.sgid.global.interface_id);
+ break;
+
+ case RDMACM_MUX_MSG_TYPE_UNREG:
+ rc = delete_fd_ifid_pair(fd, msg.hdr.sgid.global.interface_id);
+ break;
+
+ case RDMACM_MUX_MSG_TYPE_MAD:
+ /* If this is REQ or REP then store the pair comm_id,fd to be later
+ * used for other messages where gid is unknown */
+ hdr = (struct umad_hdr *)msg.umad.mad;
+ attr_id = be16toh(hdr->attr_id);
+ if ((attr_id == UMAD_CM_ATTR_REQ) || (attr_id == UMAD_CM_ATTR_DREQ) ||
+ (attr_id == UMAD_CM_ATTR_SIDR_REQ) ||
+ (attr_id == UMAD_CM_ATTR_REP) || (attr_id == UMAD_CM_ATTR_DREP)) {
+ comm_id = (uint32_t *)(msg.umad.mad + sizeof(*hdr));
+ hash_tbl_save_fd_comm_id_pair(fd, *comm_id,
+ msg.hdr.sgid.global.interface_id);
+ }
+
+ rc = umad_send(server.umad_agent.port_id, server.umad_agent.agent_id,
+ &msg.umad, msg.umad_len, 1, 0);
+ if (rc) {
+ syslog(LOG_WARNING, "Fail to send MAD message, err=%d", rc);
+ }
+ break;
+
+ default:
+ syslog(LOG_WARNING, "Got invalid message (%d) from %d",
+ msg.hdr.msg_type, fd);
+ rc = RDMACM_MUX_ERR_CODE_EINVAL;
+ }
+
+ msg.hdr.msg_type = RDMACM_MUX_MSG_TYPE_RESP;
+ msg.hdr.err_code = rc;
+ rc = send(fd, &msg, sizeof(msg), 0);
+
+ return rc == sizeof(msg) ? 0 : -EPIPE;
+}
+
+static int accept_all(void)
+{
+ int fd, rc = 0;;
+
+ pthread_rwlock_wrlock(&server.lock);
+
+ do {
+ if ((server.nfds + 1) > MAX_CLIENTS) {
+ syslog(LOG_WARNING, "Too many clients (%d)", server.nfds);
+ rc = -EIO;
+ goto out;
+ }
+
+ fd = accept(server.fds[0].fd, NULL, NULL);
+ if (fd < 0) {
+ if (errno != EWOULDBLOCK) {
+ syslog(LOG_WARNING, "accept() failed");
+ rc = -EIO;
+ goto out;
+ }
+ break;
+ }
+
+ syslog(LOG_INFO, "Client connected on socket %d\n", fd);
+ server.fds[server.nfds].fd = fd;
+ server.fds[server.nfds].events = POLLIN;
+ server.nfds++;
+ } while (fd != -1);
+
+out:
+ pthread_rwlock_unlock(&server.lock);
+ return rc;
+}
+
+static void compress_fds(void)
+{
+ int i, j;
+ int closed = 0;
+
+ pthread_rwlock_wrlock(&server.lock);
+
+ for (i = 1; i < server.nfds; i++) {
+ if (!server.fds[i].fd) {
+ closed++;
+ for (j = i; j < server.nfds; j++) {
+ server.fds[j].fd = server.fds[j + 1].fd;
+ }
+ }
+ }
+
+ server.nfds -= closed;
+
+ pthread_rwlock_unlock(&server.lock);
+}
+
+static void close_fd(int idx)
+{
+ close(server.fds[idx].fd);
+ syslog(LOG_INFO, "Socket %d closed\n", server.fds[idx].fd);
+ hash_tbl_remove_fd_ifid_pair(server.fds[idx].fd);
+ server.fds[idx].fd = 0;
+}
+
+static void run(void)
+{
+ int rc, nfds, i;
+ bool compress = false;
+
+ syslog(LOG_INFO, "Service started");
+
+ while (server.run) {
+ rc = poll(server.fds, server.nfds, SLEEP_SECS * SCALE_US);
+ if (rc < 0) {
+ if (errno != EINTR) {
+ syslog(LOG_WARNING, "poll() failed");
+ }
+ continue;
+ }
+
+ if (rc == 0) {
+ continue;
+ }
+
+ nfds = server.nfds;
+ for (i = 0; i < nfds; i++) {
+ if (server.fds[i].revents == 0) {
+ continue;
+ }
+
+ if (server.fds[i].revents != POLLIN) {
+ if (i == 0) {
+ syslog(LOG_NOTICE, "Unexpected poll() event (0x%x)\n",
+ server.fds[i].revents);
+ } else {
+ close_fd(i);
+ compress = true;
+ }
+ continue;
+ }
+
+ if (i == 0) {
+ rc = accept_all();
+ if (rc) {
+ continue;
+ }
+ } else {
+ rc = read_and_process(server.fds[i].fd);
+ if (rc) {
+ close_fd(i);
+ compress = true;
+ }
+ }
+ }
+
+ if (compress) {
+ compress = false;
+ compress_fds();
+ }
+ }
+}
+
+static void fini_listener(void)
+{
+ int i;
+
+ if (server.fds[0].fd <= 0) {
+ return;
+ }
+
+ for (i = server.nfds - 1; i >= 0; i--) {
+ if (server.fds[i].fd) {
+ close(server.fds[i].fd);
+ }
+ }
+
+ unlink(server.args.unix_socket_path);
+}
+
+static void fini_umad(void)
+{
+ if (server.umad_agent.agent_id) {
+ umad_unregister(server.umad_agent.port_id, server.umad_agent.agent_id);
+ }
+
+ if (server.umad_agent.port_id) {
+ umad_close_port(server.umad_agent.port_id);
+ }
+
+ hash_tbl_free();
+}
+
+static void fini(void)
+{
+ if (server.umad_recv_thread) {
+ pthread_join(server.umad_recv_thread, NULL);
+ server.umad_recv_thread = 0;
+ }
+ fini_umad();
+ fini_listener();
+ pthread_rwlock_destroy(&server.lock);
+
+ syslog(LOG_INFO, "Service going down");
+}
+
+static int init_listener(void)
+{
+ struct sockaddr_un sun;
+ int rc, on = 1;
+
+ server.fds[0].fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (server.fds[0].fd < 0) {
+ syslog(LOG_ALERT, "socket() failed");
+ return -EIO;
+ }
+
+ rc = setsockopt(server.fds[0].fd, SOL_SOCKET, SO_REUSEADDR, (char *)&on,
+ sizeof(on));
+ if (rc < 0) {
+ syslog(LOG_ALERT, "setsockopt() failed");
+ rc = -EIO;
+ goto err;
+ }
+
+ rc = ioctl(server.fds[0].fd, FIONBIO, (char *)&on);
+ if (rc < 0) {
+ syslog(LOG_ALERT, "ioctl() failed");
+ rc = -EIO;
+ goto err;
+ }
+
+ if (strlen(server.args.unix_socket_path) >= sizeof(sun.sun_path)) {
+ syslog(LOG_ALERT,
+ "Invalid unix_socket_path, size must be less than %ld\n",
+ sizeof(sun.sun_path));
+ rc = -EINVAL;
+ goto err;
+ }
+
+ sun.sun_family = AF_UNIX;
+ rc = snprintf(sun.sun_path, sizeof(sun.sun_path), "%s",
+ server.args.unix_socket_path);
+ if (rc < 0 || rc >= sizeof(sun.sun_path)) {
+ syslog(LOG_ALERT, "Could not copy unix socket path\n");
+ rc = -EINVAL;
+ goto err;
+ }
+
+ rc = bind(server.fds[0].fd, (struct sockaddr *)&sun, sizeof(sun));
+ if (rc < 0) {
+ syslog(LOG_ALERT, "bind() failed");
+ rc = -EIO;
+ goto err;
+ }
+
+ rc = listen(server.fds[0].fd, SERVER_LISTEN_BACKLOG);
+ if (rc < 0) {
+ syslog(LOG_ALERT, "listen() failed");
+ rc = -EIO;
+ goto err;
+ }
+
+ server.fds[0].events = POLLIN;
+ server.nfds = 1;
+ server.run = true;
+
+ return 0;
+
+err:
+ close(server.fds[0].fd);
+ return rc;
+}
+
+static int init_umad(void)
+{
+ long method_mask[IB_USER_MAD_LONGS_PER_METHOD_MASK];
+
+ server.umad_agent.port_id = umad_open_port(server.args.rdma_dev_name,
+ server.args.rdma_port_num);
+
+ if (server.umad_agent.port_id < 0) {
+ syslog(LOG_WARNING, "umad_open_port() failed");
+ return -EIO;
+ }
+
+ memset(&method_mask, 0, sizeof(method_mask));
+ method_mask[0] = MAD_METHOD_MASK0;
+ server.umad_agent.agent_id = umad_register(server.umad_agent.port_id,
+ UMAD_CLASS_CM,
+ UMAD_SA_CLASS_VERSION,
+ MAD_RMPP_VERSION, method_mask);
+ if (server.umad_agent.agent_id < 0) {
+ syslog(LOG_WARNING, "umad_register() failed");
+ return -EIO;
+ }
+
+ hash_tbl_alloc();
+
+ return 0;
+}
+
+static void signal_handler(int sig, siginfo_t *siginfo, void *context)
+{
+ static bool warned;
+
+ /* Prevent stop if clients are connected */
+ if (server.nfds != 1) {
+ if (!warned) {
+ syslog(LOG_WARNING,
+ "Can't stop while active client exist, resend SIGINT to
overid");
+ warned = true;
+ return;
+ }
+ }
+
+ if (sig == SIGINT) {
+ server.run = false;
+ fini();
+ }
+
+ exit(0);
+}
+
+static int init(void)
+{
+ int rc;
+
+ rc = init_listener();
+ if (rc) {
+ return rc;
+ }
+
+ rc = init_umad();
+ if (rc) {
+ return rc;
+ }
+
+ pthread_rwlock_init(&server.lock, 0);
+
+ rc = pthread_create(&server.umad_recv_thread, NULL, umad_recv_thread_func,
+ NULL);
+ if (!rc) {
+ return rc;
+ }
+
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ int rc;
+ struct sigaction sig = {0};
+
+ sig.sa_sigaction = &signal_handler;
+ sig.sa_flags = SA_SIGINFO;
+
+ if (sigaction(SIGINT, &sig, NULL) < 0) {
+ syslog(LOG_ERR, "Fail to install SIGINT handler\n");
+ return -EAGAIN;
+ }
+
+ memset(&server, 0, sizeof(server));
+
+ parse_args(argc, argv);
+
+ rc = init();
+ if (rc) {
+ syslog(LOG_ERR, "Fail to initialize server (%d)\n", rc);
+ rc = -EAGAIN;
+ goto out;
+ }
+
+ run();
+
+out:
+ fini();
+
+ return rc;
+}
diff --git a/contrib/rdmacm-mux/rdmacm-mux.h b/contrib/rdmacm-mux/rdmacm-mux.h
new file mode 100644
index 0000000000..03508d52b2
--- /dev/null
+++ b/contrib/rdmacm-mux/rdmacm-mux.h
@@ -0,0 +1,56 @@
+/*
+ * QEMU paravirtual RDMA - rdmacm-mux declarations
+ *
+ * Copyright (C) 2018 Oracle
+ * Copyright (C) 2018 Red Hat Inc
+ *
+ * Authors:
+ * Yuval Shaia <yuval.sh...@oracle.com>
+ * Marcel Apfelbaum <mar...@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef RDMACM_MUX_H
+#define RDMACM_MUX_H
+
+#include "linux/if.h"
+#include "infiniband/verbs.h"
+#include "infiniband/umad.h"
+#include "rdma/rdma_user_cm.h"
+
+typedef enum RdmaCmMuxMsgType {
+ RDMACM_MUX_MSG_TYPE_REG = 0,
+ RDMACM_MUX_MSG_TYPE_UNREG = 1,
+ RDMACM_MUX_MSG_TYPE_MAD = 2,
+ RDMACM_MUX_MSG_TYPE_RESP = 3,
+} RdmaCmMuxMsgType;
+
+typedef enum RdmaCmMuxErrCode {
+ RDMACM_MUX_ERR_CODE_OK = 0,
+ RDMACM_MUX_ERR_CODE_EINVAL = 1,
+ RDMACM_MUX_ERR_CODE_EEXIST = 2,
+ RDMACM_MUX_ERR_CODE_EACCES = 3,
+ RDMACM_MUX_ERR_CODE_ENOTFOUND = 4,
+} RdmaCmMuxErrCode;
+
+typedef struct RdmaCmMuxHdr {
+ RdmaCmMuxMsgType msg_type;
+ union ibv_gid sgid;
+ RdmaCmMuxErrCode err_code;
+} RdmaCmUHdr;
+
+typedef struct RdmaCmUMad {
+ struct ib_user_mad hdr;
+ char mad[RDMA_MAX_PRIVATE_DATA];
+} RdmaCmUMad;
+
+typedef struct RdmaCmMuxMsg {
+ RdmaCmUHdr hdr;
+ int umad_len;
+ RdmaCmUMad umad;
+} RdmaCmMuxMsg;
+
+#endif
--
2.17.2
