linux-kernel - RE: Socket Direct Protocol: help (2)

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Message-ID: <2EFBCAEF10980645BBCFB605689E08E9047C7402DA@azsmsx506.amr.corp.intel.com>
Date:	Tue, 13 Apr 2010 09:28:14 -0700
From:	"Tung, Chien Tin" <chien.tin.tung@...el.com>
To:	Andrea Gozzelino <Andrea.Gozzelino@....infn.it>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"rolandd@...co.com" <rolandd@...co.com>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"pavel@....cz" <pavel@....cz>, "mingo@...e.hu" <mingo@...e.hu>,
	Eric B Munson <ebmunson@...ibm.com>,
	Steve Wise <swise@...ngridcomputing.com>
Subject: RE: Socket Direct Protocol: help (2)

>I add that in kernel space SDP debug the error is:
>
>command line: dmesg
>sdp_init_qp:95 sdp_sock( 2100:2 40720:0): recv sge's. capability: 4
>needed: 9
>sdp_init_qp:95 sdp_sock( 2100:2 41203:0): recv sge's. capability: 4
>needed: 9
>
>The structure sdp_init_qp() is defined in
>/usr/src/ofa_kernel-1.5.1/drivers/infiniband/ulp/sdp/sdp_cma.c (lines 76
>- 141)

NE020 supports 4 SGEs.  I don't know enough about SDP to know why it is
using this calculation for # of send_sge:

#define SDP_MAX_RECV_SKB_FRAGS (PAGE_SIZE > 0x8000 ? 1 : 0x8000 / PAGE_SIZE)


>Could be a firmware problem?

This is not a firmware problem.

Chien


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