Ryan Haining | b189915 | 2018-01-29 15:50:37 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2018 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | #pragma once |
Ryan Haining | b189915 | 2018-01-29 15:50:37 -0800 | [diff] [blame] | 17 | |
| 18 | #include "common/vsoc/shm/base.h" |
| 19 | #include "common/vsoc/shm/circqueue.h" |
| 20 | #include "common/vsoc/shm/lock.h" |
| 21 | #include "common/vsoc/shm/version.h" |
| 22 | |
| 23 | // Memory layout for wifi packet exchange region. |
| 24 | namespace vsoc { |
| 25 | namespace layout { |
| 26 | namespace socket_forward { |
| 27 | |
| 28 | struct QueuePair { |
| 29 | // Traffic originating from host that proceeds towards guest. |
| 30 | CircularPacketQueue<16, 8192> host_to_guest; |
| 31 | // Traffic originating from guest that proceeds towards host. |
| 32 | CircularPacketQueue<16, 8192> guest_to_host; |
| 33 | |
| 34 | enum QueueState : std::uint32_t { |
| 35 | INACTIVE = 0, |
| 36 | HOST_CONNECTED = 1, |
| 37 | BOTH_CONNECTED = 2, |
| 38 | HOST_CLOSED = 3, |
| 39 | GUEST_CLOSED = 4, |
| 40 | // If both are closed then the queue goes back to INACTIVE |
| 41 | // BOTH_CLOSED = 0, |
| 42 | }; |
| 43 | QueueState queue_state_; |
| 44 | std::uint32_t port_; |
| 45 | |
| 46 | SpinLock queue_state_lock_; |
Greg Hartman | f16d58f | 2018-02-12 17:27:16 -0800 | [diff] [blame^] | 47 | |
| 48 | bool Recover() { |
| 49 | bool recovered = false; |
| 50 | bool rval = host_to_guest.Recover(); |
| 51 | recovered = recovered || rval; |
| 52 | rval = guest_to_host.Recover(); |
| 53 | recovered = recovered || rval; |
| 54 | rval = queue_state_lock_.Recover(); |
| 55 | recovered = recovered || rval; |
| 56 | // TODO: Put queue_state_ and port_ recovery here, probably after grabbing |
| 57 | // the queue_state_lock_. |
| 58 | return recovered; |
| 59 | } |
Ryan Haining | b189915 | 2018-01-29 15:50:37 -0800 | [diff] [blame] | 60 | }; |
| 61 | |
| 62 | struct SocketForwardLayout : public RegionLayout { |
Greg Hartman | f16d58f | 2018-02-12 17:27:16 -0800 | [diff] [blame^] | 63 | bool Recover() { |
| 64 | bool recovered = false; |
| 65 | for (auto& i : queues_) { |
| 66 | bool rval = i.Recover(); |
| 67 | recovered = recovered || rval; |
| 68 | } |
| 69 | //TODO: consider handling the sequence number here |
| 70 | return recovered; |
| 71 | } |
| 72 | |
Ryan Haining | b189915 | 2018-01-29 15:50:37 -0800 | [diff] [blame] | 73 | QueuePair queues_[version_info::socket_forward::kNumQueues]; |
| 74 | std::atomic_uint32_t seq_num; |
| 75 | static const char* region_name; |
| 76 | }; |
| 77 | |
| 78 | ASSERT_SHM_COMPATIBLE(SocketForwardLayout, socket_forward); |
| 79 | |
| 80 | } // namespace socket_forward |
| 81 | } // namespace layout |
| 82 | } // namespace vsoc |