1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * VMware VMCI Driver 4 * 5 * Copyright (C) 2012 VMware, Inc. All rights reserved. 6 */ 7 8 #ifndef _VMCI_DATAGRAM_H_ 9 #define _VMCI_DATAGRAM_H_ 10 11 #include <linux/types.h> 12 #include <linux/list.h> 13 14 #include "vmci_context.h" 15 16 #define VMCI_MAX_DELAYED_DG_HOST_QUEUE_SIZE 256 17 18 /* 19 * The struct vmci_datagram_queue_entry is a queue header for the in-kernel VMCI 20 * datagram queues. It is allocated in non-paged memory, as the 21 * content is accessed while holding a spinlock. The pending datagram 22 * itself may be allocated from paged memory. We shadow the size of 23 * the datagram in the non-paged queue entry as this size is used 24 * while holding the same spinlock as above. 25 */ 26 struct vmci_datagram_queue_entry { 27 struct list_head list_item; /* For queuing. */ 28 size_t dg_size; /* Size of datagram. */ 29 struct vmci_datagram *dg; /* Pending datagram. */ 30 }; 31 32 /* VMCIDatagramSendRecvInfo */ 33 struct vmci_datagram_snd_rcv_info { 34 u64 addr; 35 u32 len; 36 s32 result; 37 }; 38 39 /* Datagram API for non-public use. */ 40 int vmci_datagram_dispatch(u32 context_id, struct vmci_datagram *dg, 41 bool from_guest); 42 int vmci_datagram_invoke_guest_handler(struct vmci_datagram *dg); 43 44 #endif /* _VMCI_DATAGRAM_H_ */ 45