SharedRegion_Entry Struct Reference

本文深入探讨了共享区域的Entry结构定义,包括其关键字段的详细解释,如基地址、长度、所有者进程ID、缓存启用状态、缓存行大小以及创建堆标志等,确保系统中所有处理器的一致性。

SharedRegion_Entry Struct Reference

Structure defining a region. More...

#include <SharedRegion.h>

Data Fields

Ptr base
SizeT len
UInt16 ownerProcId
Bool isValid
Bool cacheEnable
SizeT cacheLineSize
Bool createHeap
String name

Detailed Description

Structure defining a region.


Field Documentation

The base address of the region

The length of the region

Ths length of a region must be the same across all processors in the system.

The MultiProc id of the owner of the region

The owner id for a shared region must be the same across all processors in the system.

Whether the region is valid

Whether to perform cache operations for the region

If 'TRUE', a cache invalidate is performed before any read and a cache write back invalidate is performed after any write for the shared region. The cache operations are done for all caches. If 'FALSE', no cache operations are performed.

The cache line size of the region

The cache line size for a region must be the same across all processors in the system. It is used for structure alignment and padding.

Whether a heap is created for the region

If 'TRUE', a HeapMemMP instance is created with the size spanning the length of the shared region minus any memory that is reserved in the region. If 'FALSE', no heap is created in the shared region.

The name of the region.

The name must be in persistent memory. It is used for displaying in ROV.


The documentation for this struct was generated from the following file:

Copyright 2010, Texas Instruments Incorporated
以下是对你提供的代码段进行 **Linux 内标准风格** 重构,并添加完整、清晰的 **英文注释(kerneldoc + inline comments)** 的版本: ```c /** * to_ventry - Convert a generic rdma_user_mmap_entry to virtio_rdma_user_mmap_entry * @rdma_entry: Pointer to the base mmap entry (from RDMA core) * * This helper function uses container_of() to safely derive a pointer to the * containing 'struct virtio_rdma_user_mmap_entry', based on the assumption that * 'rdma_entry' is the first member of that structure. This is essential for * accessing driver-private data in mmap fault handlers or cleanup callbacks. * * Returns: Pointer to the parent virtio_rdma_user_mmap_entry structure. */ static inline struct virtio_rdma_user_mmap_entry * to_ventry(struct rdma_user_mmap_entry *rdma_entry) { return container_of(rdma_entry, struct virtio_rdma_user_mmap_entry, rdma_entry); } /** * virtio_rdma_mmap - Handle userspace mmap request for virtio-rdma resources * @context: User context from IB layer * @vma: Virtual memory area to be mapped * * This callback is invoked when userspace calls mmap() on a special offset * returned by an ioctl (e.g., during CQ or QP creation). It maps device-specific * memory regions (like completion queues or queue pair rings) into user space * for zero-copy access. * * The VMA's pgoff field contains the mmap offset registered via * rdma_user_mmap_entry_insert(). This function looks up the corresponding * mmap entry and sets up the appropriate vm_ops for page fault handling. * * Return: * - 0 on success * - Negative error code (e.g., -EINVAL, -EAGAIN) on failure */ int virtio_rdma_mmap(struct ib_ucontext *context, struct vm_area_struct *vma); /** * virtio_rdma_mmap_free - Free mmap entry when userspace unmaps or closes * @rdma_entry: The mmap entry being released * * This callback is registered with the RDMA core to free private mmap entries * when the user process unmaps the region or exits. It is responsible for * releasing any resources associated with the mapping (e.g., freeing metadata). * * The function should use 'to_ventry()' to retrieve the private structure, * then kfree() it. Note: The actual mapped memory (e.g., ring buffer) may be * freed separately depending on lifecycle management. * * @rdma_entry: Pointer to the base RDMA mmap entry (container within our struct) */ void virtio_rdma_mmap_free(struct rdma_user_mmap_entry *rdma_entry); ``` --- ### ✅ 修改说明与风格要点 | 改进点 | 说明 | |-------|------| | **Kerneldoc 注释 (`/** */`)** | 每个函数都使用标准 kerneldoc 格式,可用于生成文档(如 `kernel-doc` 工具) | | **清晰的函数描述** | 说明用途、参数意义、返回值、内部机制(如 offset 查找) | | **英文术语统一** | 使用标准术语:`userspace`, `mmap`, `VMA`, `offset`, `fault handler`, `zero-copy` 等 | | **内联格式规范** | 函数体外声明(`.h` 文件中),不带实现;换行对齐参数 | | **container_of 安全性强调** | 在 `to_ventry` 中注明依赖“`rdma_entry` 是第一个成员”这一前提 | --- ### 📌 典型使用场景示例(可放在 `.c` 文件中) ```c // 假设在 fault handler 或 free 回调中: static void my_mmap_free_cb(struct rdma_user_mmap_entry *entry) { struct virtio_rdma_user_mmap_entry *ventry = to_ventry(entry); kfree(ventry); // 包含 rdma_entry 的整个结构被释放 } // 在 mmap 中: int virtio_rdma_mmap(struct ib_ucontext *context, struct vm_area_struct *vma) { struct rdma_user_mmap_entry *entry; struct virtio_rdma_user_mmap_entry *ventry; entry = rdma_user_mmap_entry_get(context, vma->vm_pgoff << PAGE_SHIFT); if (!entry) return -EINVAL; ventry = to_ventry(entry); vma->vm_ops = &virtio_rdma_vm_ops; vma->vm_private_data = ventry; rdma_user_mmap_entry_put(entry); return 0; } ``` --- ###
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值