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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 Reviewed-by: Laszlo Ersek --- OvmfPkg/VirtioNetDxe/SnpGetStatus.c | 35 ++++++++++++++++---- OvmfPkg/VirtioNetDxe/SnpTransmit.c | 27 +++++++++++---- 2 files changed, 49 insertions(+), 13 deletions(-) diff --git a/OvmfPkg/VirtioNetDxe/SnpGetStatus.c b/OvmfPkg/VirtioNetDxe/Snp= GetStatus.c index 694940ea1d97..9b1c352227b3 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; @@ -141,14 +142,34 @@ VirtioNetGetStatus ( ASSERT (DescIdx < (UINT32) (2 * Dev->TxMaxPending - 1)); =20 // - // report buffer address to caller that has been enqueued by caller + // get the device address that has been enqueued for the caller's + // transmit buffer // - *TxBuf =3D (VOID *)(UINTN) Dev->TxRing.Desc[DescIdx + 1].Addr; + DeviceAddress =3D Dev->TxRing.Desc[DescIdx + 1].Addr; =20 // // now this descriptor can be used again to enqueue a transmit buffer // Dev->TxFreeStack[--Dev->TxCurPending] =3D (UINT16) DescIdx; + + // + // Unmap the device address and perform the reverse mapping to find = the + // caller buffer address. + // + Status =3D VirtioNetUnmapTxBuf ( + Dev, + TxBuf, + DeviceAddress + ); + if (EFI_ERROR (Status)) { + // + // VirtioNetUnmapTxBuf should never fail, if we have reached here + // that means our internal state has been corrupted + // + ASSERT (FALSE); + Status =3D EFI_DEVICE_ERROR; + goto Exit; + } } } =20 diff --git a/OvmfPkg/VirtioNetDxe/SnpTransmit.c b/OvmfPkg/VirtioNetDxe/SnpT= ransmit.c index 7ca40d5d0650..b39226e138b9 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 +145,24 @@ VirtioNetTransmit ( } =20 // + // Map the transmit buffer system physical address to device address. + // + Status =3D VirtioNetMapTxBuf ( + Dev, + 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 // DescIdx =3D Dev->TxFreeStack[Dev->TxCurPending++]; - Dev->TxRing.Desc[DescIdx + 1].Addr =3D (UINTN) Buffer; + Dev->TxRing.Desc[DescIdx + 1].Addr =3D DeviceAddress; Dev->TxRing.Desc[DescIdx + 1].Len =3D (UINT32) BufferSize; =20 // --=20 2.9.5 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel