891f016c1b
Each network packet is submitted for transmission by pushing the head descriptor of a two-part descriptor chain to the Available Ring of the TX queue. VirtioNetInitTx() sets up the the descriptor chains for all queueable packets in advance, and points all the head descriptors to the same shared, never modified, VIRTIO_1_0_NET_REQ header object (or its initial VIRTIO_NET_REQ sub-object, dependent on virtio version). VirtioNetInitTx() currently uses the header object's system physical address for populating the head descriptors. When device is behind the IOMMU, VirtioNet driver is required to provide the device address of VIRTIO_1_0_NET_REQ header. In this patch we dynamically allocate the header using AllocateSharedPages() and map with BusMasterCommonBuffer so that header can be accessed by both processor and the device. We map the header object for CommonBuffer operation because, in order to stick with the current code order, we populate the head descriptors with the header's device address first, and fill in the header itself second. 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>
86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/** @file
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Helper functions used by at least two Simple Network Protocol methods.
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Copyright (C) 2013, Red Hat, Inc.
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This program and the accompanying materials are licensed and made available
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under the terms and conditions of the BSD License which accompanies this
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distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
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WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Library/MemoryAllocationLib.h>
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#include "VirtioNet.h"
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/**
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Release RX and TX resources on the boundary of the
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EfiSimpleNetworkInitialized state.
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These functions contribute to rolling back a partial, failed initialization
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of the virtio-net SNP driver instance, or to shutting down a fully
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initialized, running instance.
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They are only callable by the VirtioNetInitialize() and the
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VirtioNetShutdown() SNP methods. See the state diagram in "VirtioNet.h".
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@param[in,out] Dev The VNET_DEV driver instance being shut down, or whose
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partial, failed initialization is being rolled back.
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*/
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VOID
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EFIAPI
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VirtioNetShutdownRx (
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IN OUT VNET_DEV *Dev
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)
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{
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Dev->VirtIo->UnmapSharedBuffer (Dev->VirtIo, Dev->RxBufMap);
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Dev->VirtIo->FreeSharedPages (
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Dev->VirtIo,
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Dev->RxBufNrPages,
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Dev->RxBuf
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);
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}
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VOID
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EFIAPI
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VirtioNetShutdownTx (
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IN OUT VNET_DEV *Dev
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)
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{
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Dev->VirtIo->UnmapSharedBuffer (Dev->VirtIo, Dev->TxSharedReqMap);
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Dev->VirtIo->FreeSharedPages (
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Dev->VirtIo,
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EFI_SIZE_TO_PAGES (sizeof *(Dev->TxSharedReq)),
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Dev->TxSharedReq
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);
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FreePool (Dev->TxFreeStack);
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}
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/**
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Release TX and RX VRING resources.
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@param[in,out] Dev The VNET_DEV driver instance which was using
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the ring.
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@param[in,out] Ring The virtio ring to clean up.
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@param[in] RingMap A token return from the VirtioRingMap()
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*/
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VOID
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EFIAPI
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VirtioNetUninitRing (
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IN OUT VNET_DEV *Dev,
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IN OUT VRING *Ring,
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IN VOID *RingMap
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)
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{
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Dev->VirtIo->UnmapSharedBuffer (Dev->VirtIo, RingMap);
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VirtioRingUninit (Dev->VirtIo, Ring);
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}
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