On 5/15/2014 10:23 AM, Sagi Grimberg wrote:
On 5/14/2014 11:35 PM, Nicholas A. Bellinger wrote:
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
This patch explicitly disables Immediate + Unsolicited Data for ISER
connections during login in iscsi_login_zero_tsih_s2() when protection
has been enabled for the session by the underlying hardware.
This is currently required because protection / signature memory regions
(MRs) expect T10 PI to occur on RDMA READs + RDMA WRITEs transfers, and
not on a immediate data payload associated with ISCSI_OP_SCSI_CMD, or
unsolicited data-out associated with a ISCSI_OP_SCSI_DATA_OUT.
Hey Nic,
Thanks for this one. see comments below.
Cc: Sagi Grimberg <sagig@xxxxxxxxxxxx>
Cc: Or Gerlitz <ogerlitz@xxxxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
drivers/target/iscsi/iscsi_target_login.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/drivers/target/iscsi/iscsi_target_login.c
b/drivers/target/iscsi/iscsi_target_login.c
index b72d855..9e99b63 100644
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -452,6 +452,27 @@ static int iscsi_login_zero_tsih_s2(
ISCSI_LOGIN_STATUS_NO_RESOURCES);
return -1;
}
+ /*
+ * ISER currently requires that ImmediateData + Unsolicited
+ * Data be disabled when protection / signature MRs are
enabled.
+ */
+ if (sess->se_sess->sup_prot_ops &
+ (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS)) {
We should condition with TARGET_PROT_DOUT_INSERT as well. when working
in T10-PI mode (expose a T10-PI backstore)
against legacy initiators we want the HBA to offload T10-PI
generation. In this case the prot_op will be
TARGET_PROT_DOUT_INSERT and we need RDMA transfer for that.
Note: I'm aware that this is just semantics since isert exposes
TARGET_PROT_ALL anyway.
+
+ sprintf(buf, "ImmediateData=No");
I think a debug/warning print is appropriate in this case.
something of the following:
pr_warn("T10-PI mode is active, Setting ImmediateData=No,
InitialR2T=Yes\n");
+ if (iscsi_change_param_value(buf, conn->param_list, 0) <
0) {
+ iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
+ ISCSI_LOGIN_STATUS_NO_RESOURCES);
+ return -1;
+ }
+
+ sprintf(buf, "InitialR2T=Yes");
+ if (iscsi_change_param_value(buf, conn->param_list, 0) <
0) {
+ iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
+ ISCSI_LOGIN_STATUS_NO_RESOURCES);
+ return -1;
+ }
+ }
}
return 0;
--
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