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Commit 123bc2a2 authored by Pramod Kumar's avatar Pramod Kumar Committed by Roland Dreier
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RDMA/cxgb4: Configure 0B MRs to match HW implementation 



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: default avatarPramod Kumar <pramod@chelsio.com>
Signed-off-by: default avatarSteve Wise <swise@opengridcomputing.com>
Signed-off-by: default avatarHariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: default avatarRoland Dreier <roland@purestorage.com>
parent 63a71ba6

drivers/infiniband/hw/cxgb4/mem.c

+4 −2
Original line number Diff line number Diff line
@@ -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;