linux-kernel - Re: [RFC] vDPA: Trying to make sense of config data

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Message-ID: <e7ba91a7-2ba6-4532-a59a-03c2023309c6@digitalocean.com>
Date: Fri, 23 Aug 2024 09:51:24 -0500
From: Carlos Bilbao <cbilbao@...italocean.com>
To: virtualization@...ts.linux-foundation.org, mst@...hat.com,
 jasowang@...hat.com
Cc: kvm@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] vDPA: Trying to make sense of config data

Hello again, 

Answering my own question:

https://elixir.bootlin.com/linux/v6.10.2/source/include/uapi/linux/virtio_net.h#L92

Thanks, Carlos

On 8/22/24 1:21 PM, Carlos Bilbao wrote:
> Hello folks,
>
> I'm using the code below to retrieve configuration data for my vDPA file
> via ioctl. I get as output:
>
> Configuration data (24 bytes):
> 5a c3 5f 68 48 a9 01 00 08 00 dc 05 00 00 00 00
> 00 00 00 00 00 00 00 00
> ASCII representation:
> Z._hH...................
>
> Could a good Samaritan point me in the right direction for the docs I need
> to understand these values and convert them to a human-readable format?
> hank you in advance!
>
> Regards,
> Carlos
>
> ---
>
> void check_config(int fd) {
>
>     uint32_t size;
>     struct vhost_vdpa_config *config;
>     uint8_t *buf;
>
>     if (ioctl(fd, VHOST_VDPA_GET_CONFIG_SIZE, &size) < 0) {
>         perror("ioctl failed");
>         return;
>     }
>
>     config = malloc(sizeof(struct vhost_vdpa_config) + size);
>     if (!config) {
>         perror("malloc failed");
>         return;
>     }
>
>     memset(config, 0, sizeof(struct vhost_vdpa_config) + size);
>     config->len = size;
>     config->off = 0;
>
>     buf = config->buf;
>
>     if (ioctl(fd, VHOST_VDPA_GET_CONFIG, config) < 0) {
>         perror("ioctl failed");
>     } else {
>         printf("Configuration data (%u bytes):\n", size);
>
>         /* Print the data in a human-readable format */
>         for (unsigned int i = 0; i < size; i++) {
>             if (i % 16 == 0 && i != 0) printf("\n");
>             printf("%02x ", buf[i]);
>         }
>         printf("\n");
>
>         printf("ASCII representation:\n");
>         for (unsigned int i = 0; i < size; i++) {
>             if (buf[i] >= 32 && buf[i] <= 126) {
>                 printf("%c", buf[i]);
>             } else {
>                 printf(".");
>             }
>         }
>         printf("\n");
>     }
>
>     free(config);
> }