rte_kni_common.h

/* SPDX-License-Identifier: (BSD-3-Clause OR LGPL-2.1) */
/*
 * Copyright(c) 2007-2014 Intel Corporation.
 */

#ifndef _RTE_KNI_COMMON_H_
#define _RTE_KNI_COMMON_H_

#ifdef __cplusplus
extern "C" {
#endif

#ifdef __KERNEL__
#include <linux/if.h>
#include <asm/barrier.h>
#define RTE_STD_C11
#else
#include <rte_common.h>
#include <rte_config.h>
#endif

/*
 * KNI name is part of memzone name. Must not exceed IFNAMSIZ.
 */
#define RTE_KNI_NAMESIZE 16

#define RTE_CACHE_LINE_MIN_SIZE 64

/*
 * Request id.
 */
enum rte_kni_req_id {
    RTE_KNI_REQ_UNKNOWN = 0,
    RTE_KNI_REQ_CHANGE_MTU,
    RTE_KNI_REQ_CFG_NETWORK_IF,
    RTE_KNI_REQ_CHANGE_MAC_ADDR,
    RTE_KNI_REQ_CHANGE_PROMISC,
    RTE_KNI_REQ_CHANGE_ALLMULTI,
    RTE_KNI_REQ_MAX,
};

/*
 * Structure for KNI request.
 */
struct rte_kni_request {
    uint32_t req_id;             
    RTE_STD_C11
    union {
        uint32_t new_mtu;    
        uint8_t if_up;       
        uint8_t mac_addr[6]; 
        uint8_t promiscusity;
        uint8_t allmulti;    
    };
    int32_t async : 1;            
    int32_t result;               
} __attribute__((__packed__));

/*
 * Fifo struct mapped in a shared memory. It describes a circular buffer FIFO
 * Write and read should wrap around. Fifo is empty when write == read
 * Writing should never overwrite the read position
 */
struct rte_kni_fifo {
#ifdef RTE_USE_C11_MEM_MODEL
    unsigned write;              
    unsigned read;               
#else
    volatile unsigned write;     
    volatile unsigned read;      
#endif
    unsigned len;                
    unsigned elem_size;          
    void *volatile buffer[];     
};

/*
 * The kernel image of the rte_mbuf struct, with only the relevant fields.
 * Padding is necessary to assure the offsets of these fields
 */
struct rte_kni_mbuf {
    void *buf_addr __attribute__((__aligned__(RTE_CACHE_LINE_SIZE)));
    uint64_t buf_iova;
    uint16_t data_off;      
    char pad1[2];
    uint16_t nb_segs;       
    char pad4[2];
    uint64_t ol_flags;      
    char pad2[4];
    uint32_t pkt_len;       
    uint16_t data_len;      
    char pad3[14];
    void *pool;

    /* fields on second cache line */
    __attribute__((__aligned__(RTE_CACHE_LINE_MIN_SIZE)))
    void *next;             
};

/*
 * Struct used to create a KNI device. Passed to the kernel in IOCTL call
 */

struct rte_kni_device_info {
    char name[RTE_KNI_NAMESIZE];  
    phys_addr_t tx_phys;
    phys_addr_t rx_phys;
    phys_addr_t alloc_phys;
    phys_addr_t free_phys;

    /* Used by Ethtool */
    phys_addr_t req_phys;
    phys_addr_t resp_phys;
    phys_addr_t sync_phys;
    void * sync_va;

    /* mbuf mempool */
    void * mbuf_va;
    phys_addr_t mbuf_phys;

    uint16_t group_id;            
    uint32_t core_id;             
    __extension__
    uint8_t force_bind : 1;       
    /* mbuf size */
    unsigned mbuf_size;
    unsigned int mtu;
    unsigned int min_mtu;
    unsigned int max_mtu;
    uint8_t mac_addr[6];
    uint8_t iova_mode;
};

#define KNI_DEVICE "kni"

#define RTE_KNI_IOCTL_TEST    _IOWR(0, 1, int)
#define RTE_KNI_IOCTL_CREATE  _IOWR(0, 2, struct rte_kni_device_info)
#define RTE_KNI_IOCTL_RELEASE _IOWR(0, 3, struct rte_kni_device_info)

#ifdef __cplusplus
}
#endif

#endif /* _RTE_KNI_COMMON_H_ */