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Do you have additional comments or suggestions on V4 to include in the next spin? Thanks, -Wei On 8/22/24 3:41 PM, Wei Huang wrote: > Hi All, > > TPH (TLP Processing Hints) is a PCIe feature that allows endpoint > devices to provide optimization hints for requests that target memory > space. These hints, in a format called steering tag (ST), are provided > in the requester's TLP headers and allow the system hardware, including > the Root Complex, to optimize the utilization of platform resources > for the requests. > > Upcoming AMD hardware implement a new Cache Injection feature that > leverages TPH. Cache Injection allows PCIe endpoints to inject I/O > Coherent DMA writes directly into an L2 within the CCX (core complex) > closest to the CPU core that will consume it. This technology is aimed > at applications requiring high performance and low latency, such as > networking and storage applications. > > This series introduces generic TPH support in Linux, allowing STs to be > retrieved and used by PCIe endpoint drivers as needed. As a > demonstration, it includes an example usage in the Broadcom BNXT driver. > When running on Broadcom NICs with the appropriate firmware, it shows > substantial memory bandwidth savings and better network bandwidth using > real-world benchmarks. This solution is vendor-neutral and implemented > based on industry standards (PCIe Spec and PCI FW Spec). > > V3->V4: > * Rebase on top of the latest pci/next tree (tag: 6.11-rc1) > * Add new API functioins to query/enable/disable TPH support > * Make pcie_tph_set_st() completely independent from pcie_tph_get_cpu_st() > * Rewrite bnxt.c based on new APIs > * Remove documentation for now due to constantly changing API > * Remove pci=notph, but keep pci=nostmode with better flow (Bjorn) > * Lots of code rewrite in tph.c & pci-tph.h with cleaner interface (Bjorn) > * Add TPH save/restore support (Paul Luse and Lukas Wunner) > > V2->V3: > * Rebase on top of pci/next tree (tag: pci-v6.11-changes) > * Redefine PCI TPH registers (pci_regs.h) without breaking uapi > * Fix commit subjects/messages for kernel options (Jonathan and Bjorn) > * Break API functions into three individual patches for easy review > * Rewrite lots of code in tph.c/tph.h based (Jonathan and Bjorn) > > V1->V2: > * Rebase on top of pci.git/for-linus (6.10-rc1) > * Address mismatched data types reported by Sparse (Sparse check passed) > * Add pcie_tph_intr_vec_supported() for checking IRQ mode support > * Skip bnxt affinity notifier registration if > pcie_tph_intr_vec_supported()=false > * Minor fixes in bnxt driver (i.e. warning messages) > > Manoj Panicker (1): > bnxt_en: Add TPH support in BNXT driver > > Michael Chan (1): > bnxt_en: Pass NQ ID to the FW when allocating RX/RX AGG rings > > Paul Luse (1): > PCI/TPH: Add save/restore support for TPH > > Wei Huang (9): > PCI: Introduce PCIe TPH support framework > PCI: Add TPH related register definition > PCI/TPH: Add pcie_tph_modes() to query TPH modes > PCI/TPH: Add pcie_enable_tph() to enable TPH > PCI/TPH: Add pcie_disable_tph() to disable TPH > PCI/TPH: Add pcie_tph_enabled() to check TPH state > PCI/TPH: Add pcie_tph_set_st_entry() to set ST tag > PCI/TPH: Add pcie_tph_get_cpu_st() to get ST tag > PCI/TPH: Add pci=nostmode to force TPH No ST Mode > > .../admin-guide/kernel-parameters.txt | 3 + > drivers/net/ethernet/broadcom/bnxt/bnxt.c | 86 ++- > drivers/net/ethernet/broadcom/bnxt/bnxt.h | 4 + > drivers/pci/pci.c | 4 + > drivers/pci/pci.h | 12 + > drivers/pci/pcie/Kconfig | 11 + > drivers/pci/pcie/Makefile | 1 + > drivers/pci/pcie/tph.c | 563 ++++++++++++++++++ > drivers/pci/probe.c | 1 + > include/linux/pci-tph.h | 48 ++ > include/linux/pci.h | 7 + > include/uapi/linux/pci_regs.h | 38 +- > 12 files changed, 768 insertions(+), 10 deletions(-) > create mode 100644 drivers/pci/pcie/tph.c > create mode 100644 include/linux/pci-tph.h >