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ib_srpt: Document known max_sge limitations

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@3628 d57e44dd-8a1f-0410-8b47-8ef2f437770f
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Bart Van Assche
2011-06-26 07:20:49 +00:00
parent 85ac2c728b
commit 3e6f7ba432
1 changed files with 11 additions and 0 deletions
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11
srpt/src/ib_srpt.c
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@@ -2008,6 +2008,17 @@ static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
qp_init->sq_sig_type = IB_SIGNAL_REQ_WR;
qp_init->qp_type = IB_QPT_RC;
qp_init->cap.max_send_wr = srpt_sq_size;
/*
* A quote from the OFED 1.5.3.1 release notes
* (docs/release_notes/mthca_release_notes.txt), section "Known Issues":
* In mem-free devices, RC QPs can be created with a maximum of
* (max_sge - 1) entries only; UD QPs can be created with a maximum of
* (max_sge - 3) entries.
* A quote from the OFED 1.2.5 release notes
* (docs/mthca_release_notes.txt), section "Known Issues":
* In mem-free devices, RC QPs can be created with a maximum of
* (max_sge - 3) entries only.
*/
ch->max_sge = sdev->dev_attr.max_sge - 3;
BUG_ON(ch->max_sge < 1);
qp_init->cap.max_send_sge = ch->max_sge;