IB/mlx5, iser, isert: Add Signature API additions

Expose more signature setting parameters. We modify the signature API
to allow usage of some new execution parameters relevant to data
integrity feature.

This patch modifies ib_sig_domain structure by:

- Deprecate DIF type in signature API (operation will
  be determined by the parameters alone, no DIF type awareness)
- Add APPTAG check bitmask (for input domain)
- Add REFTAG remap (increment) flag for each domain
- Add APPTAG/REFTAG escape options for each domain

The mlx5 driver is modified to follow the new parameters in HW
signature setup.

At the moment the callers (iser/isert) hard-code new parameters (by
DIF type). In the future, callers will retrieve them from the scsi
command structure.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 14 insertions, 26 deletions

diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index 7309275..0bea5776 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -2609,51 +2609,39 @@ isert_fast_reg_mr(struct isert_conn *isert_conn,
 	return ret;
 }
 
-static inline enum ib_t10_dif_type
-se2ib_prot_type(enum target_prot_type prot_type)
-{
-	switch (prot_type) {
-	case TARGET_DIF_TYPE0_PROT:
-		return IB_T10DIF_NONE;
-	case TARGET_DIF_TYPE1_PROT:
-		return IB_T10DIF_TYPE1;
-	case TARGET_DIF_TYPE2_PROT:
-		return IB_T10DIF_TYPE2;
-	case TARGET_DIF_TYPE3_PROT:
-		return IB_T10DIF_TYPE3;
-	default:
-		return IB_T10DIF_NONE;
-	}
-}
-
 static inline void
 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
 		     struct ib_sig_domain *domain)
 {
-	enum ib_t10_dif_type ib_prot_type = se2ib_prot_type(se_cmd->prot_type);
-
-	domain->sig.dif.type = ib_prot_type;
+	domain->sig_type = IB_SIG_TYPE_T10_DIF;
 	domain->sig.dif.bg_type = IB_T10DIF_CRC;
 	domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
 	domain->sig.dif.ref_tag = se_cmd->reftag_seed;
+	/*
+	 * At the moment we hard code those, but if in the future
+	 * the target core would like to use it, we will take it
+	 * from se_cmd.
+	 */
+	domain->sig.dif.apptag_check_mask = 0xffff;
+	domain->sig.dif.app_escape = true;
+	domain->sig.dif.ref_escape = true;
+	if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
+	    se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
+		domain->sig.dif.ref_remap = true;
 };
 
 static int
 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
 {
-
-	sig_attrs->mem.sig_type = IB_SIG_TYPE_T10_DIF;
-	sig_attrs->wire.sig_type = IB_SIG_TYPE_T10_DIF;
-
 	switch (se_cmd->prot_op) {
 	case TARGET_PROT_DIN_INSERT:
 	case TARGET_PROT_DOUT_STRIP:
-		sig_attrs->mem.sig.dif.type = IB_T10DIF_NONE;
+		sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
 		isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
 		break;
 	case TARGET_PROT_DOUT_INSERT:
 	case TARGET_PROT_DIN_STRIP:
-		sig_attrs->wire.sig.dif.type = IB_T10DIF_NONE;
+		sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
 		isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
 		break;
 	case TARGET_PROT_DIN_PASS: