J. Bruce Fields wrote:
On Thu, Oct 09, 2008 at 01:46:43PM -0500, Tom Tucker wrote:
Coming up with a name for the command is probably
harder than writing it.
Here it is...
Neat-o, thanks.
Just for fun, I installed libibverbs from Fedora 9, modprobe'd
ib_uverbs, and tried running this, and got a "libibverbs: Warning:
couldn't open config directory '/etc/libibverbs.d'." Is there a HOWTO
somewhere that I should know about?
Hmm. Sounds like the Fedora RPM didn't do all the necessary bits. I have
a Fedora 9 system,
I'll see what I get. I typically use the latest OFED distro.
Tom
--b.
#include <stdlib.h>
#include <stdio.h>
#include <infiniband/verbs.h>
#define FAST_REG (1<<21) /* This will be in infiniband/verbs.h in the future */
static char *safety_string(struct ibv_device_attr *a, struct ibv_device *dev)
{
if (a->device_cap_flags & FAST_REG
|| dev->transport_type == IBV_TRANSPORT_IB)
return "Safe. NFSRDMA exposes only RPC memory.\n";
else
return "Unsafe. NFSRDMA exposes Server memory.\n";
}
int main(int argc, char *argv[])
{
struct ibv_device **dev_list;
struct ibv_context *context;
struct ibv_device_attr attr;
int dev_count;
int i;
dev_list = ibv_get_device_list(&dev_count);
for (i = 0; dev_list && i < dev_count; i++) {
printf("%-20s: ", ibv_get_device_name(dev_list[i]));
context = ibv_open_device(dev_list[i]);
if (!context) {
printf("could not open device\n");
continue;
}
if (!ibv_query_device(context, &attr))
printf("%s\n", safety_string(&attr, dev_list[i]));
else
printf("could not query device\n");
ibv_close_device(context);
}
if (dev_list)
ibv_free_device_list(dev_list);
exit(0);
}
The one drawback is that it wouldn't be able to tell whether the
currently running kernel actually supported fast registration. Do you
think a guess based on kernel version would be good enough for that?
I do, yes.
This code makes devices more secure than they used to be. So there is
no negative security regression here. This patchset simply improves
the security for newer devices that support the new features.
Yes, agreed. Just to be clear, I *have* queued up all but these last
two patches (the printk and documentation patches) for 2.6.28.
Ok, thanks.
--b.
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