mirror of https://github.com/acidanthera/audk.git
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> |
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| .. | ||
| ComponentName.c | ||
| DriverBinding.c | ||
| EntryPoint.c | ||
| Events.c | ||
| SnpGetStatus.c | ||
| SnpInitialize.c | ||
| SnpMcastIpToMac.c | ||
| SnpReceive.c | ||
| SnpReceiveFilters.c | ||
| SnpSharedHelpers.c | ||
| SnpShutdown.c | ||
| SnpStart.c | ||
| SnpStop.c | ||
| SnpTransmit.c | ||
| SnpUnsupported.c | ||
| TechNotes.txt | ||
| VirtioNet.h | ||
| VirtioNet.inf | ||