[dpdk-dev] [PATCH 0/4] librte_pmd_virtio :Fix: virtio_pci.h non-existent virtio feature bit-flag tested
Carew, Alan
alan.carew at intel.com
Mon Jun 16 12:19:53 CEST 2014
> -----Original Message-----
> From: Carew, Alan
> Sent: Thursday, June 05, 2014 3:39 PM
> To: dev at dpdk.org
> Cc: Carew, Alan
> Subject: [PATCH 0/4] librte_pmd_virtio :Fix: virtio_pci.h non-existent virtio
> feature bit-flag tested
>
> This series addresses an issue with librte_pmd_virtio where the offset to the
> virtio device specific header may be incorrect depending on whether MSI-X has
> been enabled or not.
>
> If MSI-X is configured the device specific header is placed at byte offset 24
> relative to the IO base address.
> If MSI-X is not configured the device specific header is placed at
> byte offset 20.
>
> The following macro defined in virtio_pci.h is used to test the
> presence of the MSI-X header and determine the correct offset:
> #define VIRTIO_PCI_CONFIG(hw) (((hw)->guest_features &
> VIRTIO_PCI_FLAG_MSIX) ? 24 : 20)
>
> However, VIRTIO_PCI_FLAG_MSIX is not a guest_feature nor is it part of the
> Virtio Specification and resolves to the VIRTIO_NET_F_MAC feature as both
> are #defined as 0x20.
>
> VIRTIO_PCI_FLAG_MSIX or similar flag should instead be set by the kernel
> driver allocating resources and passed to user space for testing.
> i.e.
> #define VIRTIO_PCI_CONFIG(hw) (((hw)->intr_mode &
> IGBUIO_MSIX_INTR_MODE) ? 24 : 20)
>
> To enable this testing of interrupt mode, this series allows for the kernel
> driver(igb_uio) to place the configured interrupt mode into a sysfs entry.
> sysfs is then parsed by eal_pci to determine the configured mode, which
> allows all user space devices to correctly determine the interrupt mode,
> including virtio_ethdev.
>
> This series should be applied prior to Anatoly Burakov's
> [VFIO] Add VFIO support to DPDK series
>
> Alan Carew (4):
> igb_uio: Add interrupt_mode sysfs entry for igb_uio devices
> eal_pci: Add interrupt mode to rte_pci_device and parsing to eal_pci
> FreeBSD: Adds the equivalent interrupt mode setting and parsing
> virtio: Fixes the VIRTIO_PCI_CONFIG macro to use the correct offset
> to the Virtio header
>
> lib/librte_eal/bsdapp/eal/eal_pci.c | 44 ++++++++++
> lib/librte_eal/bsdapp/nic_uio/nic_uio.c | 14 +++
> lib/librte_eal/common/Makefile | 1 +
> lib/librte_eal/common/include/rte_pci.h | 2 +
> .../common/include/rte_pci_dev_feature_defs.h | 85
> ++++++++++++++++++++
> .../common/include/rte_pci_dev_features.h | 70 ++++++++++++++++
> lib/librte_eal/linuxapp/eal/eal_pci.c | 78 ++++++++++++++++++
> lib/librte_eal/linuxapp/igb_uio/igb_uio.c | 48 +++++++++---
> lib/librte_pmd_virtio/virtio_ethdev.c | 1 +
> lib/librte_pmd_virtio/virtio_pci.h | 4 +-
> 10 files changed, 336 insertions(+), 11 deletions(-)
> create mode 100755
> lib/librte_eal/common/include/rte_pci_dev_feature_defs.h
> create mode 100755 lib/librte_eal/common/include/rte_pci_dev_features.h
Self NAK, alternative approach and patch set to follow.
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