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RDMA/cxgb4: Configure 0B MRs to match HW implementation

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0B MRs need some tweaks to work correctly with HW. When writing the
TPTE, if the MR length is zero we now:

1) turn off all permissions
2) set the length to -1

While functionality/capabilities of the MR are the same with these
changes, it resolves a dapltest 0B RDMA Read test failure.  Based on
original work by Steve Wise <swise@opengridcomputing.com>.

Signed-off-by: Pramod Kumar <pramod@chelsio.com>
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Pramod Kumar 2014-11-21 09:36:35 -06:00 committed by Roland Dreier
parent 63a71ba617
commit 123bc2a27a
1 changed files with 4 additions and 2 deletions
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6
drivers/infiniband/hw/cxgb4/mem.c
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@ -369,9 +369,11 @@ static int register_mem(struct c4iw_dev *rhp, struct c4iw_pd *php,
int ret;
ret = write_tpt_entry(&rhp->rdev, 0, &stag, 1, mhp->attr.pdid,
FW_RI_STAG_NSMR, mhp->attr.perms,
FW_RI_STAG_NSMR, mhp->attr.len ?
mhp->attr.perms : 0,
mhp->attr.mw_bind_enable, mhp->attr.zbva,
mhp->attr.va_fbo, mhp->attr.len, shift - 12,
mhp->attr.va_fbo, mhp->attr.len ?
mhp->attr.len : -1, shift - 12,
mhp->attr.pbl_size, mhp->attr.pbl_addr);
if (ret)
return ret;