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charset="utf-8" When device is behind the IOMMU, driver is require to pass the device address of caller-supplied transmit buffer for the bus master operations. The patch uses VirtioNetMapTxBuf() to map caller-supplied Tx packet to a device-address and enqueue the device address in VRING for transfer and perform the reverse mapping when transfer is completed so that we can return the caller-supplied buffer. Cc: Ard Biesheuvel Cc: Jordan Justen Cc: Tom Lendacky Cc: Laszlo Ersek Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Brijesh Singh --- OvmfPkg/VirtioNetDxe/SnpGetStatus.c | 30 +++++++++++++---- OvmfPkg/VirtioNetDxe/SnpTransmit.c | 34 ++++++++++++++++---- 2 files changed, 50 insertions(+), 14 deletions(-) diff --git a/OvmfPkg/VirtioNetDxe/SnpGetStatus.c b/OvmfPkg/VirtioNetDxe/Snp= GetStatus.c index 694940ea1d97..9bd62fbe8ec0 100644 --- a/OvmfPkg/VirtioNetDxe/SnpGetStatus.c +++ b/OvmfPkg/VirtioNetDxe/SnpGetStatus.c @@ -61,11 +61,12 @@ VirtioNetGetStatus ( OUT VOID **TxBuf OPTIONAL ) { - VNET_DEV *Dev; - EFI_TPL OldTpl; - EFI_STATUS Status; - UINT16 RxCurUsed; - UINT16 TxCurUsed; + VNET_DEV *Dev; + EFI_TPL OldTpl; + EFI_STATUS Status; + UINT16 RxCurUsed; + UINT16 TxCurUsed; + EFI_PHYSICAL_ADDRESS DeviceAddress; =20 if (This =3D=3D NULL) { return EFI_INVALID_PARAMETER; @@ -141,9 +142,24 @@ VirtioNetGetStatus ( ASSERT (DescIdx < (UINT32) (2 * Dev->TxMaxPending - 1)); =20 // - // report buffer address to caller that has been enqueued by caller + // get the device address to caller that has been enqueued by caller // - *TxBuf =3D (VOID *)(UINTN) Dev->TxRing.Desc[DescIdx + 1].Addr; + DeviceAddress =3D Dev->TxRing.Desc[DescIdx + 1].Addr; + + // + // Unmap the device address and perform the reverse mapping to find = the + // caller buffer address. + // + Status =3D VirtioNetUnmapTxBuf ( + Dev, + DescIdx + 1, + TxBuf, + DeviceAddress + ); + if (EFI_ERROR (Status)) { + Status =3D EFI_DEVICE_ERROR; + goto Exit; + } =20 // // now this descriptor can be used again to enqueue a transmit buffer diff --git a/OvmfPkg/VirtioNetDxe/SnpTransmit.c b/OvmfPkg/VirtioNetDxe/SnpT= ransmit.c index 7ca40d5d0650..0be3243b4606 100644 --- a/OvmfPkg/VirtioNetDxe/SnpTransmit.c +++ b/OvmfPkg/VirtioNetDxe/SnpTransmit.c @@ -73,11 +73,12 @@ VirtioNetTransmit ( IN UINT16 *Protocol OPTIONAL ) { - VNET_DEV *Dev; - EFI_TPL OldTpl; - EFI_STATUS Status; - UINT16 DescIdx; - UINT16 AvailIdx; + VNET_DEV *Dev; + EFI_TPL OldTpl; + EFI_STATUS Status; + UINT16 DescIdx; + UINT16 AvailIdx; + EFI_PHYSICAL_ADDRESS DeviceAddress; =20 if (This =3D=3D NULL || BufferSize =3D=3D 0 || Buffer =3D=3D NULL) { return EFI_INVALID_PARAMETER; @@ -144,10 +145,29 @@ VirtioNetTransmit ( } =20 // - // virtio-0.9.5, 2.4.1 Supplying Buffers to The Device + // Get the free VRING descriptor // DescIdx =3D Dev->TxFreeStack[Dev->TxCurPending++]; - Dev->TxRing.Desc[DescIdx + 1].Addr =3D (UINTN) Buffer; + + // + // Map the transmit buffer system physical address to device address. + // + Status =3D VirtioNetMapTxBuf ( + Dev, + DescIdx + 1, + Buffer, + BufferSize, + &DeviceAddress + ); + if (EFI_ERROR (Status)) { + Status =3D EFI_DEVICE_ERROR; + goto Exit; + } + + // + // virtio-0.9.5, 2.4.1 Supplying Buffers to The Device + // + Dev->TxRing.Desc[DescIdx + 1].Addr =3D DeviceAddress; Dev->TxRing.Desc[DescIdx + 1].Len =3D (UINT32) BufferSize; =20 // --=20 2.9.4 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel