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mlx5_core: Copy DIF fields only when input and output space values match

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Some DIF implementations (SCSI initiator/target) may want to use different
input/output values for application tag and/or reference tag. So in
case memory/wire domain values don't match HW must not copy them.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Sagi Grimberg 2014-05-18 18:32:40 +03:00 committed by Roland Dreier
parent 5c273b1677
commit c7f44fbda6
1 changed files with 6 additions and 3 deletions
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9
drivers/infiniband/hw/mlx5/qp.c
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@ -2078,6 +2078,7 @@ static int mlx5_set_bsf(struct ib_mr *sig_mr,
struct ib_sig_domain *wire = &sig_attrs->wire;
int ret, selector;
memset(bsf, 0, sizeof(*bsf));
switch (sig_attrs->mem.sig_type) {
case IB_SIG_TYPE_T10_DIF:
if (sig_attrs->wire.sig_type != IB_SIG_TYPE_T10_DIF)
@ -2090,9 +2091,11 @@ static int mlx5_set_bsf(struct ib_mr *sig_mr,
/* Same block structure */
basic->bsf_size_sbs = 1 << 4;
if (mem->sig.dif.bg_type == wire->sig.dif.bg_type)
basic->wire.copy_byte_mask = 0xff;
else
basic->wire.copy_byte_mask = 0x3f;
basic->wire.copy_byte_mask |= 0xc0;
if (mem->sig.dif.app_tag == wire->sig.dif.app_tag)
basic->wire.copy_byte_mask |= 0x30;
if (mem->sig.dif.ref_tag == wire->sig.dif.ref_tag)
basic->wire.copy_byte_mask |= 0x0f;
} else
basic->wire.bs_selector = bs_selector(wire->sig.dif.pi_interval);