Fix memory allocation for interface request

In order to pass per lcore queue input error statistics to the
application that does vif query, we allocate only VR_MAX_CPUS
worth of memory, but we try to copy vr_num_cpus worth of data.
In the case of vr_num_cpus > VR_MAX_CPUS (64), we will hit a snag.
As a fix, allocate memory for vr_num_cpus.

Change-Id: Ifb1060aac20011b8d51e1b31063a363fe268fd3d
Closes-Bug: #1621816

dp-core/vr_interface.c

@@ -1988,7 +1988,7 @@ __vr_interface_make_req(vr_interface_req *req, struct vr_interface *intf,
     req->vifr_oerrors = 0;
     /* queue counters */
     req->vifr_queue_ipackets = 0;
-    for (i = 0; i < VR_MAX_CPUS; i++)
+    for (i = 0; i < vr_num_cpus; i++)
         req->vifr_queue_ierrors_to_lcore[i] = 0;
     req->vifr_queue_ierrors = 0;
     req->vifr_queue_opackets = 0;
@@ -2072,6 +2072,18 @@ __vr_interface_make_req(vr_interface_req *req, struct vr_interface *intf,
     return;
 }
 
+unsigned int
+vr_interface_req_get_size(void *req_p)
+{
+    unsigned int size = 4 * sizeof(vr_interface_req);
+    vr_interface_req *req = (vr_interface_req *)req_p;
+
+    if (req->vifr_queue_ierrors_to_lcore)
+        size += (vr_num_cpus * sizeof(int64_t));
+
+    return size;
+}
+
 static int
 vr_interface_make_req(vr_interface_req *req, struct vr_interface *vif,
         unsigned int core)
@@ -2116,7 +2128,7 @@ vr_interface_req_get(void)
     req->vifr_name = vr_zalloc(VR_INTERFACE_NAME_LEN,
             VR_INTERFACE_REQ_NAME_OBJECT);
 
-    req->vifr_queue_ierrors_to_lcore = vr_zalloc(VR_MAX_CPUS * sizeof(uint64_t),
+    req->vifr_queue_ierrors_to_lcore = vr_zalloc(vr_num_cpus * sizeof(uint64_t),
             VR_INTERFACE_REQ_TO_LCORE_ERRORS_OBJECT);
     if (req->vifr_queue_ierrors_to_lcore)
         req->vifr_queue_ierrors_to_lcore_size = 0;

dp-core/vr_sandesh.c

@@ -16,6 +16,7 @@ struct sandesh_object_md sandesh_md[] = {
     },
     [VR_INTERFACE_OBJECT_ID]    =   {
         .obj_len                =       4 * sizeof(vr_interface_req),
+        .obj_get_size           =       vr_interface_req_get_size,
         .obj_type_string        =       "vr_interface_req",
     },
     [VR_NEXTHOP_OBJECT_ID]      =   {

include/vr_interface.h

@@ -311,4 +311,5 @@ extern void vr_set_vif_ptr(struct net_device *dev, void *vif);
 #endif
 extern fat_flow_port_mask_t vif_fat_flow_lookup(struct vr_interface *,
         uint8_t, uint16_t, uint16_t);
+extern unsigned int vr_interface_req_get_size(void *);
 #endif /* __VR_INTERFACE_H__ */

include/vrouter.h

@@ -13,6 +13,7 @@ extern "C" {
 #include "sandesh.h"
 #include "vr_types.h"
 #include "vr_flow.h"
+#include "vr_interface.h"
 #include "vr_nexthop.h"
 #include "vr_route.h"
 #include "vr_response.h"

utils/vif.c

@@ -632,6 +632,13 @@ rate_process(vr_interface_req *req, vr_interface_req *prev_req)
         temp_prev_req_ptr = prev_req->vifr_queue_ierrors_to_lcore;
         *prev_req = *req;
         prev_req->vifr_queue_ierrors_to_lcore = temp_prev_req_ptr;
+        if (!prev_req->vifr_queue_ierrors_to_lcore) {
+            prev_req->vifr_queue_ierrors_to_lcore =
+                malloc(req->vifr_queue_ierrors_to_lcore_size * sizeof(uint64_t));
+            if (!prev_req->vifr_queue_ierrors_to_lcore)
+                return;
+        }
+
         memcpy(prev_req->vifr_queue_ierrors_to_lcore,
             req->vifr_queue_ierrors_to_lcore,
             req->vifr_queue_ierrors_to_lcore_size * sizeof(uint64_t));
@@ -640,7 +647,8 @@ rate_process(vr_interface_req *req, vr_interface_req *prev_req)
     }
 
     rate_req_temp = *req;
-    rate_req_temp.vifr_queue_ierrors_to_lcore = calloc(VR_MAX_CPUS, sizeof(uint64_t));
+    rate_req_temp.vifr_queue_ierrors_to_lcore =
+        calloc(req->vifr_queue_ierrors_to_lcore_size, sizeof(uint64_t));
 
     if (!rate_req_temp.vifr_queue_ierrors_to_lcore) {
         fprintf(stderr, "Fail, memory allocation. (%s:%d).", __FILE__ , __LINE__);
@@ -1503,17 +1511,6 @@ main(int argc, char *argv[])
         vr_intf_op(cl, vr_op);
 
     } else {
-        for (i = 0; i < VR_MAX_INTERFACES; i++) {
-
-            prev_req[i].vifr_queue_ierrors_to_lcore =
-                (calloc(VR_MAX_CPUS, sizeof(uint64_t)));
-
-            if (!(prev_req[i].vifr_queue_ierrors_to_lcore)) {
-                fprintf(stderr, "Fail, memory allocation. (%s:%d).", __FILE__ , __LINE__);
-                exit(1);
-            }
-        }
-
         fcntl(STDIN_FILENO, F_SETFL, fcntl(STDIN_FILENO, F_GETFL) | O_NONBLOCK);
         /*
          * tc[get/set]attr functions are for changing terminal behavior.