RDMA CM: private_data_len

RDMA CM: private_data_len

[Yann Droneaud]

Hi,

On a client, rdma_connect() returns -1 and set errno EINVAL if 
struct rdma_conn_param->private_data_len is set to something higher than
56 bytes.

But on a server, using rdma_accept() with struct
rdma_conn_param->private_data_len is set to 64 (for example) didn't
return any error. 

What is the maximum data size that can be exchanged between peers at
connection time, and where to find its definition (at compile time or at
runtime) ?

Regards.

-- 
Yann Droneaud
OPTEYA


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Re: RDMA CM: private_data_len

[Or Gerlitz]

Yann Droneaud wrote:
> On a client, rdma_connect() returns -1 and set errno EINVAL if 
> struct rdma_conn_param->private_data_len is set to something higher than
> 56 bytes.
> 
> But on a server, using rdma_accept() with struct
> rdma_conn_param->private_data_len is set to 64 (for example) didn't
> return any error. 
> 
> What is the maximum data size that can be exchanged between peers at
> connection time, and where to find its definition (at compile time or at
> runtime) ?

yep, this isn't clear from the librdmacm man pages see the patch
that follows. BTW - Sean, looking on the code of the library and the
kernel's ucma.c / cma.c - I failed to find where this is enforced,
a pointer will be cool.

Or.
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Re: RDMA CM: private_data_len

[Yann Droneaud]

Le lundi 28 mars 2011 à 10:48 +0200, Or Gerlitz a écrit :
> Yann Droneaud wrote:
> > On a client, rdma_connect() returns -1 and set errno EINVAL if 
> > struct rdma_conn_param->private_data_len is set to something higher than
> > 56 bytes.
> > 
> > But on a server, using rdma_accept() with struct
> > rdma_conn_param->private_data_len is set to 64 (for example) didn't
> > return any error. 
> > 
> > What is the maximum data size that can be exchanged between peers at
> > connection time, and where to find its definition (at compile time or at
> > runtime) ?
> 
> yep, this isn't clear from the librdmacm man pages see the patch
> that follows. 

Oh yes, it's clear now.
Thanks for the patch and the link to IB specs.

Regards.

-- 
Yann Droneaud
OPTEYA


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