Re: [PATCH v1 09/12] xprtrdma: Prepare rpcrdma_ep_post() for RDMA_NOMSG calls

Tom Talpey
2015-07-10T12:58:34Z

On 7/10/2015 7:29 AM, Devesh Sharma wrote:
> we need to honor the max limits of device by checking
> dev_attr.max_sge? a vendor may not support 4 sges.

iWARP requires a minimum of 4 send SGEs (draft-hilland-verbs 8.1.3.2)

An RI MUST support at least four Scatter/Gather Elements per
Scatter/Gather List when the Scatter/Gather List refers to the Data
Source of a Send Operation Type or the Data Sink of a Receive
Operation. An RI is NOT REQUIRED to support more than one
Scatter/Gather Element per Scatter/Gather List when the
Scatter/Gather List refers to the Data Source of an RDMA Write.

I'm not certain if IB and RoCE state a similar minimum requirement,
but it seems a very bad idea to have fewer.

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