Re: [Qemu-devel] [PATCH v3 For-1.6 1/7] rdma: bugfix: make IPv6 support work

["Michael R. Hines" <mrhines@linux.vnet.ibm.com>]

On 08/07/2013 04:39 AM, Orit Wasserman wrote:
> On 08/04/2013 05:54 AM, mrhines@linux.vnet.ibm.com wrote:
>> From: "Michael R. Hines" <mrhines@us.ibm.com>
>>
>> RDMA does not use sockets, so we cannot use many of the socket
>> helper functions, but we *do* use inet_parse() which gives
>> RDMA all the necessary details of the connection parameters.
>>
>> However, when testing with libvirt, a simple IPv6 migration test failed
>> because we were not using getaddrinfo() properly.
>>
>> This makes IPv6 migration over RDMA work.
>>
>> Signed-off-by: Michael R. Hines <mrhines@us.ibm.com>
>> ---
>>   migration-rdma.c |   33 +++++++++++++++++++++------------
>>   1 file changed, 21 insertions(+), 12 deletions(-)
>>
>> diff --git a/migration-rdma.c b/migration-rdma.c
>> index d044830..9cf73e3 100644
>> --- a/migration-rdma.c
>> +++ b/migration-rdma.c
>> @@ -392,6 +392,7 @@ typedef struct RDMAContext {
>>       uint64_t unregistrations[RDMA_SIGNALED_SEND_MAX];
>>   
>>       GHashTable *blockmap;
>> +    bool ipv6;
>>   } RDMAContext;
>>   
>>   /*
>> @@ -744,6 +745,7 @@ static int qemu_rdma_resolve_host(RDMAContext *rdma, Error **errp)
>>       char port_str[16];
>>       struct rdma_cm_event *cm_event;
>>       char ip[40] = "unknown";
>> +    int af = rdma->ipv6 ? PF_INET6 : PF_INET;
>>   
>>       if (rdma->host == NULL || !strcmp(rdma->host, "")) {
>>           ERROR(errp, "RDMA hostname has not been set\n");
>> @@ -773,7 +775,7 @@ static int qemu_rdma_resolve_host(RDMAContext *rdma, Error **errp)
>>           goto err_resolve_get_addr;
>>       }
>>   
>> -    inet_ntop(AF_INET, &((struct sockaddr_in *) res->ai_addr)->sin_addr,
>> +    inet_ntop(af, &((struct sockaddr_in *) res->ai_addr)->sin_addr,
>>                                   ip, sizeof ip);
>>       DPRINTF("%s => %s\n", rdma->host, ip);
>>   
>> @@ -2236,9 +2238,12 @@ err_rdma_source_connect:
>>   static int qemu_rdma_dest_init(RDMAContext *rdma, Error **errp)
>>   {
>>       int ret = -EINVAL, idx;
>> +    int af = rdma->ipv6 ? PF_INET6 : PF_INET;
>>       struct sockaddr_in sin;
>>       struct rdma_cm_id *listen_id;
>>       char ip[40] = "unknown";
>> +    struct addrinfo *res;
>> +    char port_str[16];
>>   
>>       for (idx = 0; idx <= RDMA_WRID_MAX; idx++) {
>>           rdma->wr_data[idx].control_len = 0;
>> @@ -2266,27 +2271,30 @@ static int qemu_rdma_dest_init(RDMAContext *rdma, Error **errp)
>>       }
>>   
>>       memset(&sin, 0, sizeof(sin));
>> -    sin.sin_family = AF_INET;
>> +    sin.sin_family = af;
>>       sin.sin_port = htons(rdma->port);
>> +    snprintf(port_str, 16, "%d", rdma->port);
>> +    port_str[15] = '\0';
>>   
>>       if (rdma->host && strcmp("", rdma->host)) {
>> -        struct hostent *dest_addr;
>> -        dest_addr = gethostbyname(rdma->host);
>> -        if (!dest_addr) {
>> -            ERROR(errp, "migration could not gethostbyname!\n");
>> -            ret = -EINVAL;
>> +        ret = getaddrinfo(rdma->host, port_str, NULL, &res);
> Hi Michael,
>
> getaddrinfo can return a list of addresses, you need to handle it.
> Look at qemu-sockets.c for example.
>
> Regards,
> Orit
>> +        if (ret < 0) {
>> +            ERROR(errp, "could not getaddrinfo address %s\n", rdma->host);
>>               goto err_dest_init_bind_addr;
>>           }
>> -        memcpy(&sin.sin_addr.s_addr, dest_addr->h_addr,
>> -                dest_addr->h_length);
>> -        inet_ntop(AF_INET, dest_addr->h_addr, ip, sizeof ip);
>> +
>> +
>> +        inet_ntop(af, &((struct sockaddr_in *) res->ai_addr)->sin_addr,
>> +                                    ip, sizeof ip);
>>       } else {
>> -        sin.sin_addr.s_addr = INADDR_ANY;
>> +        ERROR(errp, "migration host and port not specified!\n");
>> +        ret = -EINVAL;
>> +        goto err_dest_init_bind_addr;
>>       }
>>   
>>       DPRINTF("%s => %s\n", rdma->host, ip);
>>   
>> -    ret = rdma_bind_addr(listen_id, (struct sockaddr *)&sin);
>> +    ret = rdma_bind_addr(listen_id, res->ai_addr);
>>       if (ret) {
>>           ERROR(errp, "Error: could not rdma_bind_addr!\n");
>>           goto err_dest_init_bind_addr;
>> @@ -2321,6 +2329,7 @@ static void *qemu_rdma_data_init(const char *host_port, Error **errp)
>>           if (addr != NULL) {
>>               rdma->port = atoi(addr->port);
>>               rdma->host = g_strdup(addr->host);
>> +            rdma->ipv6 = addr->ipv6;
>>           } else {
>>               ERROR(errp, "bad RDMA migration address '%s'", host_port);
>>               g_free(rdma);
>>
>

Acknowledged.

- Michael