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OvmfPkg/VirtioNetDxe: add Tx packet map/unmap helper functions

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When device is behind IOMMU, driver is require to pass the device address
of TxBuf in the Tx VRING. The patch adds helper functions and data
structure to map and unmap the TxBuf system physical address to a device
address.

Since the TxBuf is returned back to caller from VirtioNetGetStatus() hence
we use OrderedCollection interface to save the TxBuf system physical to
device address mapping. After the TxBuf is succesfully transmitted
VirtioNetUnmapTxBuf() does the reverse lookup in OrderedCollection data
structure to get the system physical address of TxBuf for a given device
address.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Brijesh Singh
2017-09-14 16:22:45 -05:00
committed by Laszlo Ersek
parent 76ad23ca82
commit bd114d9f77
4 changed files with 279 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
OvmfPkg/VirtioNetDxe/SnpInitialize.c
View File

@@ -147,7 +147,8 @@ ReleaseQueue:
EfiSimpleNetworkInitialized state.
@retval EFI_OUT_OF_RESOURCES Failed to allocate the stack to track the heads
of free descriptor chains.
of free descriptor chains or failed to init
TxBufCollection.
@return Status codes from VIRTIO_DEVICE_PROTOCOL.
AllocateSharedPages() or
VirtioMapAllBytesInSharedBuffer()
@@ -176,6 +177,15 @@ VirtioNetInitTx (
return EFI_OUT_OF_RESOURCES;
}
Dev->TxBufCollection = OrderedCollectionInit (
VirtioNetTxBufMapInfoCompare,
VirtioNetTxBufDeviceAddressCompare
);
if (Dev->TxBufCollection == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto FreeTxFreeStack;
}
//
// Allocate TxSharedReq header and map with BusMasterCommonBuffer so that it
// can be accessed equally by both processor and device.
@@ -186,7 +196,7 @@ VirtioNetInitTx (
&TxSharedReqBuffer
);
if (EFI_ERROR (Status)) {
goto FreeTxFreeStack;
goto UninitTxBufCollection;
}
ZeroMem (TxSharedReqBuffer, sizeof *Dev->TxSharedReq);
@@ -267,6 +277,10 @@ FreeTxSharedReqBuffer:
EFI_SIZE_TO_PAGES (sizeof *(Dev->TxSharedReq)),
TxSharedReqBuffer
);
UninitTxBufCollection:
OrderedCollectionUninit (Dev->TxBufCollection);
FreeTxFreeStack:
FreePool (Dev->TxFreeStack);