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Subject[PATCH 02/14] Add vmciDatagram.*
Date
---
drivers/misc/vmw_vmci/vmciDatagram.c | 842 ++++++++++++++++++++++++++++++++++
drivers/misc/vmw_vmci/vmciDatagram.h | 42 ++
2 files changed, 884 insertions(+), 0 deletions(-)
create mode 100644 drivers/misc/vmw_vmci/vmciDatagram.c
create mode 100644 drivers/misc/vmw_vmci/vmciDatagram.h

diff --git a/drivers/misc/vmw_vmci/vmciDatagram.c b/drivers/misc/vmw_vmci/vmciDatagram.c
new file mode 100644
index 0000000..e8a95de
--- /dev/null
+++ b/drivers/misc/vmw_vmci/vmciDatagram.c
@@ -0,0 +1,842 @@
+/*
+ * VMware VMCI Driver
+ *
+ * Copyright (C) 2012 VMware, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation version 2 and no later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+
+#include "vmci_defs.h"
+#include "vmci_infrastructure.h"
+#include "vmci_kernel_if.h"
+#include "vmciCommonInt.h"
+#include "vmciContext.h"
+#include "vmciDatagram.h"
+#include "vmciDriver.h"
+#include "vmciEvent.h"
+#include "vmciHashtable.h"
+#include "vmciKernelAPI.h"
+#include "vmciResource.h"
+#include "vmciRoute.h"
+
+#define LGPFX "VMCIDatagram: "
+
+/*
+ * struct datagram_entry describes the datagram entity. It is used for datagram
+ * entities created only on the host.
+ */
+struct datagram_entry {
+ struct vmci_resource resource;
+ uint32_t flags;
+ bool runDelayed;
+ VMCIDatagramRecvCB recvCB;
+ void *clientData;
+ wait_queue_head_t destroyEvent;
+ uint32_t privFlags;
+};
+
+struct delayed_datagram_info {
+ bool inDGHostQueue;
+ struct datagram_entry *entry;
+ struct vmci_datagram msg;
+};
+
+static atomic_t delayedDGHostQueueSize;
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * DatagramFreeCB --
+ * Callback to free datagram structure when resource is no longer used,
+ * ie. the reference count reached 0.
+ *
+ * Result:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+static void DatagramFreeCB(void *clientData)
+{
+ struct datagram_entry *entry = (struct datagram_entry *)clientData;
+ ASSERT(entry);
+ /* Entry is freed in VMCIDatagram_DestroyHnd, who waits for the signal */
+ wake_up(&entry->destroyEvent);
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * DatagramReleaseCB --
+ *
+ * Callback to release the resource reference. It is called by the
+ * VMCI_WaitOnEvent function before it blocks.
+ *
+ * Result:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+static int DatagramReleaseCB(void *clientData)
+{
+ struct datagram_entry *entry = (struct datagram_entry *)clientData;
+ ASSERT(entry);
+ VMCIResource_Release(&entry->resource);
+ return 0;
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * DatagramCreateHnd --
+ *
+ * Internal function to create a datagram entry given a handle.
+ *
+ * Results:
+ * VMCI_SUCCESS if created, negative errno value otherwise.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+static int DatagramCreateHnd(uint32_t resourceID, // IN:
+ uint32_t flags, // IN:
+ uint32_t privFlags, // IN:
+ VMCIDatagramRecvCB recvCB, // IN:
+ void *clientData, // IN:
+ struct vmci_handle *outHandle) // OUT:
+{
+ int result;
+ uint32_t contextID;
+ struct vmci_handle handle;
+ struct datagram_entry *entry;
+
+ ASSERT(recvCB != NULL);
+ ASSERT(outHandle != NULL);
+ ASSERT(!(privFlags & ~VMCI_PRIVILEGE_ALL_FLAGS));
+
+ if ((flags & VMCI_FLAG_WELLKNOWN_DG_HND) != 0) {
+ return VMCI_ERROR_INVALID_ARGS;
+ } else {
+ if ((flags & VMCI_FLAG_ANYCID_DG_HND) != 0) {
+ contextID = VMCI_INVALID_ID;
+ } else {
+ contextID = VMCI_GetContextID();
+ if (contextID == VMCI_INVALID_ID) {
+ return VMCI_ERROR_NO_RESOURCES;
+ }
+ }
+
+ if (resourceID == VMCI_INVALID_ID) {
+ resourceID = VMCIResource_GetID(contextID);
+ if (resourceID == VMCI_INVALID_ID) {
+ return VMCI_ERROR_NO_HANDLE;
+ }
+ }
+
+ handle = VMCI_MAKE_HANDLE(contextID, resourceID);
+ }
+
+ entry = kmalloc(sizeof *entry, GFP_KERNEL);
+ if (entry == NULL) {
+ VMCI_WARNING((LGPFX
+ "Failed allocating memory for datagram entry.\n"));
+ return VMCI_ERROR_NO_MEM;
+ }
+
+ entry->runDelayed = (flags & VMCI_FLAG_DG_DELAYED_CB) ? true : false;
+ entry->flags = flags;
+ entry->recvCB = recvCB;
+ entry->clientData = clientData;
+ init_waitqueue_head(&entry->destroyEvent);
+ entry->privFlags = privFlags;
+
+ /* Make datagram resource live. */
+ result =
+ VMCIResource_Add(&entry->resource, VMCI_RESOURCE_TYPE_DATAGRAM,
+ handle, DatagramFreeCB, entry);
+ if (result != VMCI_SUCCESS) {
+ VMCI_WARNING((LGPFX
+ "Failed to add new resource (handle=0x%x:0x%x).\n",
+ handle.context, handle.resource));
+ kfree(entry);
+ return result;
+ }
+ *outHandle = handle;
+
+ return VMCI_SUCCESS;
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIDatagram_Init --
+ *
+ * Initialize Datagram API, ie. register the API functions with their
+ * corresponding vectors.
+ *
+ * Result:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+int VMCIDatagram_Init(void)
+{
+ atomic_set(&delayedDGHostQueueSize, 0);
+ return VMCI_SUCCESS;
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIDatagram_CreateHnd --
+ *
+ * Creates a host context datagram endpoint and returns a handle to it.
+ *
+ * Results:
+ * VMCI_SUCCESS if created, negative errno value otherwise.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+int VMCIDatagram_CreateHnd(uint32_t resourceID, // IN: Optional, generated
+ // if VMCI_INVALID_ID
+ uint32_t flags, // IN:
+ VMCIDatagramRecvCB recvCB, // IN:
+ void *clientData, // IN:
+ struct vmci_handle *outHandle) // OUT: newly created handle
+{
+ if (outHandle == NULL)
+ return VMCI_ERROR_INVALID_ARGS;
+
+ if (recvCB == NULL) {
+ VMCI_DEBUG_LOG(4,
+ (LGPFX
+ "Client callback needed when creating datagram.\n"));
+ return VMCI_ERROR_INVALID_ARGS;
+ }
+
+ return DatagramCreateHnd(resourceID, flags,
+ VMCI_DEFAULT_PROC_PRIVILEGE_FLAGS, recvCB,
+ clientData, outHandle);
+}
+
+EXPORT_SYMBOL(VMCIDatagram_CreateHnd);
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIDatagram_CreateHndPriv --
+ *
+ * Creates a host context datagram endpoint and returns a handle to it.
+ *
+ * Results:
+ * VMCI_SUCCESS if created, negative errno value otherwise.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+int VMCIDatagram_CreateHndPriv(uint32_t resourceID, // IN: Optional, generated
+ // if VMCI_INVALID_ID
+ uint32_t flags, // IN:
+ uint32_t privFlags, // IN:
+ VMCIDatagramRecvCB recvCB, // IN:
+ void *clientData, // IN:
+ struct vmci_handle *outHandle) // OUT: newly created handle
+{
+ if (outHandle == NULL) {
+ return VMCI_ERROR_INVALID_ARGS;
+ }
+
+ if (recvCB == NULL) {
+ VMCI_DEBUG_LOG(4,
+ (LGPFX
+ "Client callback needed when creating datagram.\n"));
+ return VMCI_ERROR_INVALID_ARGS;
+ }
+
+ if (privFlags & ~VMCI_PRIVILEGE_ALL_FLAGS) {
+ return VMCI_ERROR_INVALID_ARGS;
+ }
+
+ return DatagramCreateHnd(resourceID, flags, privFlags, recvCB,
+ clientData, outHandle);
+}
+
+EXPORT_SYMBOL(VMCIDatagram_CreateHndPriv);
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIDatagram_DestroyHnd --
+ *
+ * Destroys a handle.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+int VMCIDatagram_DestroyHnd(struct vmci_handle handle) // IN
+{
+ struct datagram_entry *entry;
+ struct vmci_resource *resource = VMCIResource_Get(handle,
+ VMCI_RESOURCE_TYPE_DATAGRAM);
+ if (resource == NULL) {
+ VMCI_DEBUG_LOG(4,
+ (LGPFX
+ "Failed to destroy datagram (handle=0x%x:0x%x).\n",
+ handle.context, handle.resource));
+ return VMCI_ERROR_NOT_FOUND;
+ }
+ entry = RESOURCE_CONTAINER(resource, struct datagram_entry, resource);
+
+ VMCIResource_Remove(handle, VMCI_RESOURCE_TYPE_DATAGRAM);
+
+ /*
+ * We now wait on the destroyEvent and release the reference we got
+ * above.
+ */
+ VMCI_WaitOnEvent(&entry->destroyEvent, DatagramReleaseCB, entry);
+
+ /*
+ * We know that we are now the only reference to the above entry so
+ * can safely free it.
+ */
+ kfree(entry);
+
+ return VMCI_SUCCESS;
+}
+
+EXPORT_SYMBOL(VMCIDatagram_DestroyHnd);
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIDatagramGetPrivFlagsInt --
+ *
+ * Internal utilility function with the same purpose as
+ * VMCIDatagram_GetPrivFlags that also takes a contextID.
+ *
+ * Result:
+ * VMCI_SUCCESS on success, VMCI_ERROR_INVALID_ARGS if handle is invalid.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+static int VMCIDatagramGetPrivFlagsInt(uint32_t contextID, // IN
+ struct vmci_handle handle, // IN
+ uint32_t * privFlags) // OUT
+{
+ ASSERT(privFlags);
+ ASSERT(contextID != VMCI_INVALID_ID);
+
+ if (contextID == VMCI_HOST_CONTEXT_ID) {
+ struct datagram_entry *srcEntry;
+ struct vmci_resource *resource;
+
+ resource =
+ VMCIResource_Get(handle, VMCI_RESOURCE_TYPE_DATAGRAM);
+ if (resource == NULL) {
+ return VMCI_ERROR_INVALID_ARGS;
+ }
+ srcEntry =
+ RESOURCE_CONTAINER(resource, struct datagram_entry,
+ resource);
+ *privFlags = srcEntry->privFlags;
+ VMCIResource_Release(resource);
+ } else if (contextID == VMCI_HYPERVISOR_CONTEXT_ID) {
+ *privFlags = VMCI_MAX_PRIVILEGE_FLAGS;
+ } else {
+ *privFlags = VMCIContext_GetPrivFlags(contextID);
+ }
+
+ return VMCI_SUCCESS;
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIDatagram_GetPrivFlags --
+ *
+ * Utilility function that retrieves the privilege flags
+ * associated with a given datagram handle. For hypervisor and
+ * guest endpoints, the privileges are determined by the context
+ * ID, but for host endpoints privileges are associated with the
+ * complete handle.
+ *
+ * Result:
+ * VMCI_SUCCESS on success, VMCI_ERROR_INVALID_ARGS if handle is invalid.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+int VMCIDatagram_GetPrivFlags(struct vmci_handle handle, // IN
+ uint32_t * privFlags) // OUT
+{
+ if (privFlags == NULL || handle.context == VMCI_INVALID_ID)
+ return VMCI_ERROR_INVALID_ARGS;
+
+ return VMCIDatagramGetPrivFlagsInt(handle.context, handle, privFlags);
+}
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIDatagramDelayedDispatchCB --
+ *
+ * Calls the specified callback in a delayed context.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+static void VMCIDatagramDelayedDispatchCB(void *data) // IN
+{
+ bool inDGHostQueue;
+ struct delayed_datagram_info *dgInfo =
+ (struct delayed_datagram_info *)data;
+
+ ASSERT(data);
+
+ dgInfo->entry->recvCB(dgInfo->entry->clientData, &dgInfo->msg);
+
+ VMCIResource_Release(&dgInfo->entry->resource);
+
+ inDGHostQueue = dgInfo->inDGHostQueue;
+ kfree(dgInfo);
+
+ if (inDGHostQueue)
+ atomic_dec(&delayedDGHostQueueSize);
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIDatagramDispatchAsHost --
+ *
+ * Dispatch datagram as a host, to the host or other vm context. This
+ * function cannot dispatch to hypervisor context handlers. This should
+ * have been handled before we get here by VMCIDatagramDispatch.
+ *
+ * Result:
+ * Number of bytes sent on success, appropriate error code otherwise.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+static int VMCIDatagramDispatchAsHost(uint32_t contextID, // IN:
+ struct vmci_datagram *dg) // IN:
+{
+ int retval;
+ size_t dgSize;
+ uint32_t srcPrivFlags;
+
+ ASSERT(dg);
+ ASSERT(VMCI_HostPersonalityActive());
+
+ dgSize = VMCI_DG_SIZE(dg);
+
+ if (contextID == VMCI_HOST_CONTEXT_ID &&
+ dg->dst.context == VMCI_HYPERVISOR_CONTEXT_ID) {
+ return VMCI_ERROR_DST_UNREACHABLE;
+ }
+
+ ASSERT(dg->dst.context != VMCI_HYPERVISOR_CONTEXT_ID);
+
+ /* Check that source handle matches sending context. */
+ if (dg->src.context != contextID) {
+ VMCI_DEBUG_LOG(4,
+ (LGPFX
+ "Sender context (ID=0x%x) is not owner of src "
+ "datagram entry (handle=0x%x:0x%x).\n",
+ contextID, dg->src.context, dg->src.resource));
+ return VMCI_ERROR_NO_ACCESS;
+ }
+
+ /* Get hold of privileges of sending endpoint. */
+ retval = VMCIDatagramGetPrivFlagsInt(contextID, dg->src, &srcPrivFlags);
+ if (retval != VMCI_SUCCESS) {
+ VMCI_WARNING((LGPFX
+ "Couldn't get privileges (handle=0x%x:0x%x).\n",
+ dg->src.context, dg->src.resource));
+ return retval;
+ }
+
+ /* Determine if we should route to host or guest destination. */
+ if (dg->dst.context == VMCI_HOST_CONTEXT_ID) {
+ /* Route to host datagram entry. */
+ struct datagram_entry *dstEntry;
+ struct vmci_resource *resource;
+
+ if (dg->src.context == VMCI_HYPERVISOR_CONTEXT_ID &&
+ dg->dst.resource == VMCI_EVENT_HANDLER) {
+ return VMCIEvent_Dispatch(dg);
+ }
+
+ resource =
+ VMCIResource_Get(dg->dst, VMCI_RESOURCE_TYPE_DATAGRAM);
+ if (resource == NULL) {
+ VMCI_DEBUG_LOG(4,
+ (LGPFX
+ "Sending to invalid destination "
+ "(handle=0x%x:0x%x).\n",
+ dg->dst.context, dg->dst.resource));
+ return VMCI_ERROR_INVALID_RESOURCE;
+ }
+ dstEntry =
+ RESOURCE_CONTAINER(resource, struct datagram_entry,
+ resource);
+ if (VMCIDenyInteraction(srcPrivFlags, dstEntry->privFlags)) {
+ VMCIResource_Release(resource);
+ return VMCI_ERROR_NO_ACCESS;
+ }
+ ASSERT(dstEntry->recvCB);
+
+ /*
+ * If a VMCI datagram destined for the host is also sent by the
+ * host, we always run it delayed. This ensures that no locks
+ * are held when the datagram callback runs.
+ */
+
+ if (dstEntry->runDelayed
+ || dg->src.context == VMCI_HOST_CONTEXT_ID) {
+ struct delayed_datagram_info *dgInfo;
+
+ if (atomic_add_return(1, &delayedDGHostQueueSize)
+ == VMCI_MAX_DELAYED_DG_HOST_QUEUE_SIZE) {
+ atomic_dec(&delayedDGHostQueueSize);
+ VMCIResource_Release(resource);
+ return VMCI_ERROR_NO_MEM;
+ }
+
+ dgInfo =
+ kmalloc(sizeof *dgInfo +
+ (size_t) dg->payloadSize, GFP_ATOMIC);
+ if (NULL == dgInfo) {
+ atomic_dec(&delayedDGHostQueueSize);
+ VMCIResource_Release(resource);
+ return VMCI_ERROR_NO_MEM;
+ }
+
+ dgInfo->inDGHostQueue = true;
+ dgInfo->entry = dstEntry;
+ memcpy(&dgInfo->msg, dg, dgSize);
+
+ retval =
+ VMCI_ScheduleDelayedWork
+ (VMCIDatagramDelayedDispatchCB, dgInfo);
+ if (retval < VMCI_SUCCESS) {
+ VMCI_WARNING((LGPFX
+ "Failed to schedule delayed work for datagram "
+ "(result=%d).\n", retval));
+ kfree(dgInfo);
+ VMCIResource_Release(resource);
+ atomic_dec(&delayedDGHostQueueSize);
+ return retval;
+ }
+ } else {
+ retval = dstEntry->recvCB(dstEntry->clientData, dg);
+ VMCIResource_Release(resource);
+ if (retval < VMCI_SUCCESS) {
+ return retval;
+ }
+ }
+ } else {
+ /* Route to destination VM context. */
+ struct vmci_datagram *newDG;
+
+ if (contextID != dg->dst.context) {
+ if (VMCIDenyInteraction(srcPrivFlags,
+ VMCIContext_GetPrivFlags
+ (dg->dst.context))) {
+ return VMCI_ERROR_NO_ACCESS;
+ } else if (VMCI_CONTEXT_IS_VM(contextID)) {
+ /* If the sending context is a VM, it cannot reach another VM. */
+
+ VMCI_DEBUG_LOG(4,
+ (LGPFX
+ "Datagram communication between VMs not"
+ "supported (src=0x%x, dst=0x%x).\n",
+ contextID, dg->dst.context));
+ return VMCI_ERROR_DST_UNREACHABLE;
+ }
+ }
+
+ /* We make a copy to enqueue. */
+ newDG = kmalloc(dgSize, GFP_KERNEL);
+ if (newDG == NULL) {
+ return VMCI_ERROR_NO_MEM;
+ }
+ memcpy(newDG, dg, dgSize);
+ retval = VMCIContext_EnqueueDatagram(dg->dst.context, newDG);
+ if (retval < VMCI_SUCCESS) {
+ kfree(newDG);
+ return retval;
+ }
+ }
+
+ /*
+ * We currently truncate the size to signed 32 bits. This doesn't
+ * matter for this handler as it only support 4Kb messages.
+ */
+ return (int)dgSize;
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIDatagramDispatchAsGuest --
+ *
+ * Dispatch datagram as a guest, down through the VMX and potentially to
+ * the host.
+ *
+ * Result:
+ * Number of bytes sent on success, appropriate error code otherwise.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+static int VMCIDatagramDispatchAsGuest(struct vmci_datagram *dg)
+{
+ int retval;
+ struct vmci_resource *resource;
+
+ resource = VMCIResource_Get(dg->src, VMCI_RESOURCE_TYPE_DATAGRAM);
+ if (NULL == resource) {
+ return VMCI_ERROR_NO_HANDLE;
+ }
+
+ retval = VMCI_SendDatagram(dg);
+ VMCIResource_Release(resource);
+ return retval;
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIDatagram_Dispatch --
+ *
+ * Dispatch datagram. This will determine the routing for the datagram
+ * and dispatch it accordingly.
+ *
+ * Result:
+ * Number of bytes sent on success, appropriate error code otherwise.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+int
+VMCIDatagram_Dispatch(uint32_t contextID,
+ struct vmci_datagram *dg, bool fromGuest)
+{
+ int retval;
+ enum vmci_route route;
+
+ ASSERT(dg);
+ ASSERT_ON_COMPILE(sizeof(struct vmci_datagram) == 24);
+
+ if (VMCI_DG_SIZE(dg) > VMCI_MAX_DG_SIZE) {
+ VMCI_DEBUG_LOG(4,
+ (LGPFX "Payload (size=%" FMT64
+ "u bytes) too big to " "send.\n",
+ dg->payloadSize));
+ return VMCI_ERROR_INVALID_ARGS;
+ }
+
+ retval = VMCI_Route(&dg->src, &dg->dst, fromGuest, &route);
+ if (retval < VMCI_SUCCESS) {
+ VMCI_DEBUG_LOG(4,
+ (LGPFX
+ "Failed to route datagram (src=0x%x, dst=0x%x, "
+ "err=%d)\n.", dg->src.context,
+ dg->dst.context, retval));
+ return retval;
+ }
+
+ if (VMCI_ROUTE_AS_HOST == route) {
+ if (VMCI_INVALID_ID == contextID)
+ contextID = VMCI_HOST_CONTEXT_ID;
+ return VMCIDatagramDispatchAsHost(contextID, dg);
+ }
+
+ if (VMCI_ROUTE_AS_GUEST == route)
+ return VMCIDatagramDispatchAsGuest(dg);
+
+ VMCI_WARNING((LGPFX "Unknown route (%d) for datagram.\n", route));
+ return VMCI_ERROR_DST_UNREACHABLE;
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIDatagram_InvokeGuestHandler --
+ *
+ * Invoke the handler for the given datagram. This is intended to be
+ * called only when acting as a guest and receiving a datagram from the
+ * virtual device.
+ *
+ * Result:
+ * VMCI_SUCCESS on success, other error values on failure.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+int VMCIDatagram_InvokeGuestHandler(struct vmci_datagram *dg) // IN
+{
+ int retval;
+ struct vmci_resource *resource;
+ struct datagram_entry *dstEntry;
+
+ ASSERT(dg);
+
+ resource = VMCIResource_Get(dg->dst, VMCI_RESOURCE_TYPE_DATAGRAM);
+ if (NULL == resource) {
+ VMCI_DEBUG_LOG(4,
+ (LGPFX
+ "destination (handle=0x%x:0x%x) doesn't exist.\n",
+ dg->dst.context, dg->dst.resource));
+ return VMCI_ERROR_NO_HANDLE;
+ }
+
+ dstEntry =
+ RESOURCE_CONTAINER(resource, struct datagram_entry, resource);
+ if (dstEntry->runDelayed) {
+ struct delayed_datagram_info *dgInfo;
+
+ dgInfo =
+ kmalloc(sizeof *dgInfo + (size_t) dg->payloadSize,
+ GFP_ATOMIC);
+ if (NULL == dgInfo) {
+ VMCIResource_Release(resource);
+ retval = VMCI_ERROR_NO_MEM;
+ goto exit;
+ }
+
+ dgInfo->inDGHostQueue = false;
+ dgInfo->entry = dstEntry;
+ memcpy(&dgInfo->msg, dg, VMCI_DG_SIZE(dg));
+
+ retval =
+ VMCI_ScheduleDelayedWork(VMCIDatagramDelayedDispatchCB,
+ dgInfo);
+ if (retval < VMCI_SUCCESS) {
+ VMCI_WARNING((LGPFX
+ "Failed to schedule delayed work for datagram "
+ "(result=%d).\n", retval));
+ kfree(dgInfo);
+ VMCIResource_Release(resource);
+ dgInfo = NULL;
+ goto exit;
+ }
+ } else {
+ dstEntry->recvCB(dstEntry->clientData, dg);
+ VMCIResource_Release(resource);
+ retval = VMCI_SUCCESS;
+ }
+
+ exit:
+ return retval;
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIDatagram_Send --
+ *
+ * Sends the payload to the destination datagram handle.
+ *
+ * Results:
+ * Returns number of bytes sent if success, or error code if failure.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+int VMCIDatagram_Send(struct vmci_datagram *msg) // IN
+{
+ if (msg == NULL)
+ return VMCI_ERROR_INVALID_ARGS;
+
+ return VMCIDatagram_Dispatch(VMCI_INVALID_ID, msg, false);
+}
+
+EXPORT_SYMBOL(VMCIDatagram_Send);
+
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * VMCIDatagram_Sync --
+ *
+ * Use this as a synchronization point when setting globals, for example,
+ * during device shutdown.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+void VMCIDatagram_Sync(void)
+{
+ VMCIResource_Sync();
+}
diff --git a/drivers/misc/vmw_vmci/vmciDatagram.h b/drivers/misc/vmw_vmci/vmciDatagram.h
new file mode 100644
index 0000000..9ae003e
--- /dev/null
+++ b/drivers/misc/vmw_vmci/vmciDatagram.h
@@ -0,0 +1,42 @@
+/*
+ *
+ * VMware VMCI Driver
+ *
+ * Copyright (C) 2012 VMware, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation version 2 and no later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef _VMCI_DATAGRAM_H_
+#define _VMCI_DATAGRAM_H_
+
+#include "vmci_call_defs.h"
+#include "vmci_iocontrols.h"
+#include "vmciContext.h"
+
+#define VMCI_MAX_DELAYED_DG_HOST_QUEUE_SIZE 256
+
+/* Init functions. */
+int VMCIDatagram_Init(void);
+
+/* Datagram API for non-public use. */
+int VMCIDatagram_Dispatch(uint32_t contextID, struct vmci_datagram *dg,
+ bool fromGuest);
+int VMCIDatagram_InvokeGuestHandler(struct vmci_datagram *dg);
+int VMCIDatagram_GetPrivFlags(struct vmci_handle handle, uint32_t * privFlags);
+
+/* Misc. */
+void VMCIDatagram_Sync(void);
+
+#endif // _VMCI_DATAGRAM_H_
--
1.7.0.4


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