ipc: handle unsupported IPC in sync request

Currently, IPC API will silently ignore unsupported IPC.
Fix the API call and its callers to explicitly handle
unsupported IPC cases.

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>

diff --git a/drivers/net/mlx4/mlx4_mp.c b/drivers/net/mlx4/mlx4_mp.c
index ebc57a9..cdb6485 100644 (file)
--- a/drivers/net/mlx4/mlx4_mp.c
+++ b/drivers/net/mlx4/mlx4_mp.c
@@ -178,8 +178,9 @@ mp_req_on_rxtx(struct rte_eth_dev *dev, enum mlx4_mp_req_type type)
        mp_init_msg(dev, &mp_req, type);
        ret = rte_mp_request_sync(&mp_req, &mp_rep, &ts);
        if (ret) {
-               ERROR("port %u failed to request stop/start Rx/Tx (%d)",
-                     dev->data->port_id, type);
+               if (rte_errno != ENOTSUP)
+                       ERROR("port %u failed to request stop/start Rx/Tx (%d)",
+                                       dev->data->port_id, type);
                goto exit;
        }
        if (mp_rep.nb_sent != mp_rep.nb_received) {

diff --git a/drivers/net/mlx5/mlx5_mp.c b/drivers/net/mlx5/mlx5_mp.c
index dc99231..37f26cc 100644 (file)
--- a/drivers/net/mlx5/mlx5_mp.c
+++ b/drivers/net/mlx5/mlx5_mp.c
@@ -180,8 +180,9 @@ mp_req_on_rxtx(struct rte_eth_dev *dev, enum mlx5_mp_req_type type)
        mp_init_msg(dev, &mp_req, type);
        ret = rte_mp_request_sync(&mp_req, &mp_rep, &ts);
        if (ret) {
-               DRV_LOG(ERR, "port %u failed to request stop/start Rx/Tx (%d)",
-                       dev->data->port_id, type);
+               if (rte_errno != ENOTSUP)
+                       DRV_LOG(ERR, "port %u failed to request stop/start Rx/Tx (%d)",
+                               dev->data->port_id, type);
                goto exit;
        }
        if (mp_rep.nb_sent != mp_rep.nb_received) {

diff --git a/lib/librte_eal/common/eal_common_proc.c b/lib/librte_eal/common/eal_common_proc.c
index 5bb117c..7195d57 100644 (file)
--- a/lib/librte_eal/common/eal_common_proc.c
+++ b/lib/librte_eal/common/eal_common_proc.c
@@ -969,7 +969,8 @@ rte_mp_request_sync(struct rte_mp_msg *req, struct rte_mp_reply *reply,
 
        if (internal_config.no_shconf) {
                RTE_LOG(DEBUG, EAL, "No shared files mode enabled, IPC is disabled\n");
-               return 0;
+               rte_errno = ENOTSUP;
+               return -1;
        }
 
        if (gettimeofday(&now, NULL) < 0) {

diff --git a/lib/librte_eal/common/hotplug_mp.c b/lib/librte_eal/common/hotplug_mp.c
index 2275cac..4f316ba 100644 (file)
--- a/lib/librte_eal/common/hotplug_mp.c
+++ b/lib/librte_eal/common/hotplug_mp.c
@@ -405,7 +405,11 @@ int eal_dev_hotplug_request_to_secondary(struct eal_dev_mp_req *req)
 
        ret = rte_mp_request_sync(&mp_req, &mp_reply, &ts);
        if (ret != 0) {
-               RTE_LOG(ERR, EAL, "rte_mp_request_sync failed\n");
+               /* if IPC is not supported, behave as if the call succeeded */
+               if (rte_errno != ENOTSUP)
+                       RTE_LOG(ERR, EAL, "rte_mp_request_sync failed\n");
+               else
+                       ret = 0;
                return ret;
        }
 

diff --git a/lib/librte_eal/common/include/rte_eal.h b/lib/librte_eal/common/include/rte_eal.h
index a409d32..9cd66fe 100644 (file)
--- a/lib/librte_eal/common/include/rte_eal.h
+++ b/lib/librte_eal/common/include/rte_eal.h
@@ -331,6 +331,9 @@ rte_mp_sendmsg(struct rte_mp_msg *msg);
  * @note This API must not be used inside memory-related or IPC callbacks, and
  *   no memory allocations should take place inside such callback.
  *
+ * @note IPC may be unsupported in certain circumstances, so caller should check
+ *    for ENOTSUP error.
+ *
  * @param req
  *   The req argument contains the customized request message.
  *

diff --git a/lib/librte_eal/common/malloc_mp.c b/lib/librte_eal/common/malloc_mp.c
index 1374eab..7c6112c 100644 (file)
--- a/lib/librte_eal/common/malloc_mp.c
+++ b/lib/librte_eal/common/malloc_mp.c
@@ -573,7 +573,7 @@ request_sync(void)
        struct rte_mp_reply reply;
        struct malloc_mp_req *req = (struct malloc_mp_req *)msg.param;
        struct timespec ts;
-       int i, ret;
+       int i, ret = -1;
 
        memset(&msg, 0, sizeof(msg));
        memset(&reply, 0, sizeof(reply));
@@ -596,14 +596,16 @@ request_sync(void)
                ret = rte_mp_request_sync(&msg, &reply, &ts);
        } while (ret != 0 && rte_errno == EEXIST);
        if (ret != 0) {
-               RTE_LOG(ERR, EAL, "Could not send sync request to secondary process\n");
-               ret = -1;
+               /* if IPC is unsupported, behave as if the call succeeded */
+               if (rte_errno != ENOTSUP)
+                       RTE_LOG(ERR, EAL, "Could not send sync request to secondary process\n");
+               else
+                       ret = 0;
                goto out;
        }
 
        if (reply.nb_received != reply.nb_sent) {
                RTE_LOG(ERR, EAL, "Not all secondaries have responded\n");
-               ret = -1;
                goto out;
        }
 
@@ -612,17 +614,14 @@ request_sync(void)
                                (struct malloc_mp_req *)reply.msgs[i].param;
                if (resp->t != REQ_TYPE_SYNC) {
                        RTE_LOG(ERR, EAL, "Unexpected response from secondary\n");
-                       ret = -1;
                        goto out;
                }
                if (resp->id != req->id) {
                        RTE_LOG(ERR, EAL, "Wrong request ID\n");
-                       ret = -1;
                        goto out;
                }
                if (resp->result != REQ_RESULT_SUCCESS) {
                        RTE_LOG(ERR, EAL, "Secondary process failed to synchronize\n");
-                       ret = -1;
                        goto out;
                }
        }