[Xen-devel] vif rate dynamically change

[ahmed amamou <ahmed.amamou@xxxxxxxxxxx>]

Good morning every one,

I'm a new XEN developer I've seen that changing vif rate is not possible dynamically.

I decided to change the code so it would be possible the change it dynamically
the code change will affect this file "DOM0/drivers/xen/netback/xenbus.c"
for the moment the rate is fixed inside the connect function

static void connect(struct backend_info *be)
{
...
    if (err) {
        xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
        return;
    }

    xen_net_read_rate(dev, &be->netif->credit_bytes,
              &be->netif->credit_usec);
    be->netif->remaining_credit = be->netif->credit_bytes;
...

I want to add a function that read the rate dynamically from a /proc file
but to change rate i need to have a pointer to the backend_info struct
i found in xen XEN/tools/blktap/lib/xenbus.c a function that return backend_info struct pointer from backendpath

static struct backend_info *be_lookup_be(const char *bepath)
{
    struct backend_info *be;

    list_for_each_entry(be, &belist, list)
        if (strcmp(bepath, be->backpath) == 0)
            return be;
    return (struct backend_info *)NULL;
}

but don't reallt know how to use it.

so my questions are :
1- is it a good way to send new rate values from proc file ?
2- is it possible to use the function be_lookup_be(implimented in xen tool code) in dom0 code to find backend_info from backendpath ?
3- if the ansower of 2 is yes witch format the backendpath is exemple form vif1.3, is the backedpath like this "backend/vif/0/3" ?


thanks in advance for an respoonse concerning any question.

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