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b6dfc654 LE |
1 | /** @file\r |
2 | \r | |
3 | Implementation of the SNP.GetStatus() function and its private helpers if\r | |
4 | any.\r | |
5 | \r | |
6 | Copyright (C) 2013, Red Hat, Inc.\r | |
c4046161 | 7 | Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>\r |
b6dfc654 | 8 | \r |
b26f0cf9 | 9 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
b6dfc654 LE |
10 | \r |
11 | **/\r | |
12 | \r | |
13 | #include <Library/BaseLib.h>\r | |
14 | #include <Library/UefiBootServicesTableLib.h>\r | |
15 | \r | |
16 | #include "VirtioNet.h"\r | |
17 | \r | |
18 | /**\r | |
19 | Reads the current interrupt status and recycled transmit buffer status from\r | |
20 | a network interface.\r | |
21 | \r | |
22 | @param This The protocol instance pointer.\r | |
23 | @param InterruptStatus A pointer to the bit mask of the currently active\r | |
24 | interrupts If this is NULL, the interrupt status will\r | |
25 | not be read from the device. If this is not NULL, the\r | |
26 | interrupt status will be read from the device. When\r | |
27 | the interrupt status is read, it will also be\r | |
28 | cleared. Clearing the transmit interrupt does not\r | |
29 | empty the recycled transmit buffer array.\r | |
30 | @param TxBuf Recycled transmit buffer address. The network\r | |
31 | interface will not transmit if its internal recycled\r | |
32 | transmit buffer array is full. Reading the transmit\r | |
33 | buffer does not clear the transmit interrupt. If this\r | |
34 | is NULL, then the transmit buffer status will not be\r | |
35 | read. If there are no transmit buffers to recycle and\r | |
36 | TxBuf is not NULL, * TxBuf will be set to NULL.\r | |
37 | \r | |
38 | @retval EFI_SUCCESS The status of the network interface was\r | |
39 | retrieved.\r | |
40 | @retval EFI_NOT_STARTED The network interface has not been started.\r | |
41 | @retval EFI_INVALID_PARAMETER One or more of the parameters has an\r | |
42 | unsupported value.\r | |
43 | @retval EFI_DEVICE_ERROR The command could not be sent to the network\r | |
44 | interface.\r | |
45 | @retval EFI_UNSUPPORTED This function is not supported by the network\r | |
46 | interface.\r | |
47 | \r | |
48 | **/\r | |
b6dfc654 LE |
49 | EFI_STATUS\r |
50 | EFIAPI\r | |
51 | VirtioNetGetStatus (\r | |
ac0a286f MK |
52 | IN EFI_SIMPLE_NETWORK_PROTOCOL *This,\r |
53 | OUT UINT32 *InterruptStatus OPTIONAL,\r | |
54 | OUT VOID **TxBuf OPTIONAL\r | |
b6dfc654 LE |
55 | )\r |
56 | {\r | |
ac0a286f MK |
57 | VNET_DEV *Dev;\r |
58 | EFI_TPL OldTpl;\r | |
59 | EFI_STATUS Status;\r | |
60 | UINT16 RxCurUsed;\r | |
61 | UINT16 TxCurUsed;\r | |
62 | EFI_PHYSICAL_ADDRESS DeviceAddress;\r | |
b6dfc654 LE |
63 | \r |
64 | if (This == NULL) {\r | |
65 | return EFI_INVALID_PARAMETER;\r | |
66 | }\r | |
67 | \r | |
ac0a286f | 68 | Dev = VIRTIO_NET_FROM_SNP (This);\r |
b6dfc654 LE |
69 | OldTpl = gBS->RaiseTPL (TPL_CALLBACK);\r |
70 | switch (Dev->Snm.State) {\r | |
ac0a286f MK |
71 | case EfiSimpleNetworkStopped:\r |
72 | Status = EFI_NOT_STARTED;\r | |
73 | goto Exit;\r | |
74 | case EfiSimpleNetworkStarted:\r | |
75 | Status = EFI_DEVICE_ERROR;\r | |
76 | goto Exit;\r | |
77 | default:\r | |
78 | break;\r | |
b6dfc654 LE |
79 | }\r |
80 | \r | |
81 | //\r | |
82 | // update link status\r | |
83 | //\r | |
84 | if (Dev->Snm.MediaPresentSupported) {\r | |
ac0a286f | 85 | UINT16 LinkStatus;\r |
b6dfc654 | 86 | \r |
56f65ed8 | 87 | Status = VIRTIO_CFG_READ (Dev, LinkStatus, &LinkStatus);\r |
b6dfc654 LE |
88 | if (EFI_ERROR (Status)) {\r |
89 | goto Exit;\r | |
90 | }\r | |
ac0a286f | 91 | \r |
c4046161 | 92 | Dev->Snm.MediaPresent =\r |
ac0a286f | 93 | (BOOLEAN)((LinkStatus & VIRTIO_NET_S_LINK_UP) != 0);\r |
b6dfc654 LE |
94 | }\r |
95 | \r | |
96 | //\r | |
97 | // virtio-0.9.5, 2.4.2 Receiving Used Buffers From the Device\r | |
98 | //\r | |
99 | MemoryFence ();\r | |
100 | RxCurUsed = *Dev->RxRing.Used.Idx;\r | |
101 | TxCurUsed = *Dev->TxRing.Used.Idx;\r | |
dc9447bd | 102 | MemoryFence ();\r |
b6dfc654 LE |
103 | \r |
104 | if (InterruptStatus != NULL) {\r | |
105 | //\r | |
106 | // report the receive interrupt if there is data available for reception,\r | |
107 | // report the transmit interrupt if we have transmitted at least one buffer\r | |
108 | //\r | |
109 | *InterruptStatus = 0;\r | |
110 | if (Dev->RxLastUsed != RxCurUsed) {\r | |
111 | *InterruptStatus |= EFI_SIMPLE_NETWORK_RECEIVE_INTERRUPT;\r | |
112 | }\r | |
ac0a286f | 113 | \r |
b6dfc654 LE |
114 | if (Dev->TxLastUsed != TxCurUsed) {\r |
115 | ASSERT (Dev->TxCurPending > 0);\r | |
116 | *InterruptStatus |= EFI_SIMPLE_NETWORK_TRANSMIT_INTERRUPT;\r | |
117 | }\r | |
118 | }\r | |
119 | \r | |
120 | if (TxBuf != NULL) {\r | |
121 | if (Dev->TxLastUsed == TxCurUsed) {\r | |
122 | *TxBuf = NULL;\r | |
ac0a286f MK |
123 | } else {\r |
124 | UINT16 UsedElemIdx;\r | |
125 | UINT32 DescIdx;\r | |
b6dfc654 LE |
126 | \r |
127 | //\r | |
128 | // fetch the first descriptor among those that the hypervisor reports\r | |
129 | // completed\r | |
130 | //\r | |
131 | ASSERT (Dev->TxCurPending > 0);\r | |
132 | ASSERT (Dev->TxCurPending <= Dev->TxMaxPending);\r | |
133 | \r | |
134 | UsedElemIdx = Dev->TxLastUsed++ % Dev->TxRing.QueueSize;\r | |
ac0a286f MK |
135 | DescIdx = Dev->TxRing.Used.UsedElem[UsedElemIdx].Id;\r |
136 | ASSERT (DescIdx < (UINT32)(2 * Dev->TxMaxPending - 1));\r | |
b6dfc654 LE |
137 | \r |
138 | //\r | |
8fa54a8a BS |
139 | // get the device address that has been enqueued for the caller's\r |
140 | // transmit buffer\r | |
b6dfc654 | 141 | //\r |
8fa54a8a | 142 | DeviceAddress = Dev->TxRing.Desc[DescIdx + 1].Addr;\r |
b6dfc654 LE |
143 | \r |
144 | //\r | |
145 | // now this descriptor can be used again to enqueue a transmit buffer\r | |
146 | //\r | |
ac0a286f | 147 | Dev->TxFreeStack[--Dev->TxCurPending] = (UINT16)DescIdx;\r |
8fa54a8a BS |
148 | \r |
149 | //\r | |
150 | // Unmap the device address and perform the reverse mapping to find the\r | |
151 | // caller buffer address.\r | |
152 | //\r | |
153 | Status = VirtioNetUnmapTxBuf (\r | |
154 | Dev,\r | |
155 | TxBuf,\r | |
156 | DeviceAddress\r | |
157 | );\r | |
158 | if (EFI_ERROR (Status)) {\r | |
159 | //\r | |
160 | // VirtioNetUnmapTxBuf should never fail, if we have reached here\r | |
161 | // that means our internal state has been corrupted\r | |
162 | //\r | |
163 | ASSERT (FALSE);\r | |
164 | Status = EFI_DEVICE_ERROR;\r | |
165 | goto Exit;\r | |
166 | }\r | |
b6dfc654 LE |
167 | }\r |
168 | }\r | |
169 | \r | |
170 | Status = EFI_SUCCESS;\r | |
171 | \r | |
172 | Exit:\r | |
173 | gBS->RestoreTPL (OldTpl);\r | |
174 | return Status;\r | |
175 | }\r |