[dpdk][hotplug] DPDK网卡设备热插拔

dpdk pci网卡设备的热插拔。

样例程序如下：

... ...

static int driverctl(char* pci)                                          
{                                                                                  
    int pid;                                                                       
                                                                                   
    pid = fork();                                                                  
    if (pid == 0) {                                                                
        execlp("driverctl", "driverctl", "--nosave", "set-override",               
                pci, "igb_uio", NULL);                                             
        perror("driverctl set-override failed.");                                  
        exit(1);                                                                   
    } else if (pid > 0) {                                                          
        wait(NULL);                                                                
    } else {                                                                       
        perror("fork failed.");                                                    
        exit(1);                                                                   
    }                                                                              
                                                                                   
    return 0;                                                                      
}                                                                                  
                                                                                   
static int dpdk_bind_ethernet(struct pci_mac_map_t* port)                          
{                                                                                  
    uint8_t portid;                                                                
                                                                                   
    if (port->stat == PCI_STAT_DPDK)                                               
        return 0;                                                                  
                                                                                   
    /* bind driver. */                                                             
    /* FIXME: Only support igb_uio. */                                             
    log(LOG_INFO, "driverctl bind: %s.\n", port->pci);                      
    if (driverctl(port->pci) < 0) {                                      
        log(LOG_ERR, "driverctl()\n");                            
        return -1;                                                                 
    }                                                                              
    /* attach. */                                                                  
    log(LOG_INFO, "dpdk attach: %s.\n", port->pci);                         
    if (rte_eth_dev_attach(port->pci, &portid) < 0) {                              
        ctrl_debug(LOG_ERR, "rte_eth_dev_attach()\n");                             
        return -1;                                                                 
    }                                                                              
                                                                                                                                                                                             
    return portid;                                                                 
}                             

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