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target/cxgbit: Enable DDP for T6 only if data sequence and pdu are in order 

Enable DDP for T6 only if DataSequenceInOrder=YES and
DataPDUInOrder=YES to ensure inorder delivery of iSCSI pdus.

Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Varun Prakash 2017-01-13 20:53:24 +05:30 committed by Nicholas Bellinger
parent d88b504e41
commit 5248788ec3
1 changed files with 61 additions and 25 deletions
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86
drivers/target/iscsi/cxgbit/cxgbit_target.c
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@ -653,26 +653,6 @@ static int cxgbit_set_iso_npdu(struct cxgbit_sock *csk)
u32 max_npdu, max_iso_npdu;
if (conn->login->leading_connection) {
param = iscsi_find_param_from_key(DATASEQUENCEINORDER,
conn->param_list);
if (!param) {
pr_err("param not found key %s\n", DATASEQUENCEINORDER);
return -1;
}
if (strcmp(param->value, YES))
return 0;
param = iscsi_find_param_from_key(DATAPDUINORDER,
conn->param_list);
if (!param) {
pr_err("param not found key %s\n", DATAPDUINORDER);
return -1;
}
if (strcmp(param->value, YES))
return 0;
param = iscsi_find_param_from_key(MAXBURSTLENGTH,
conn->param_list);
if (!param) {
@ -683,11 +663,6 @@ static int cxgbit_set_iso_npdu(struct cxgbit_sock *csk)
if (kstrtou32(param->value, 0, &mbl) < 0)
return -1;
} else {
if (!conn->sess->sess_ops->DataSequenceInOrder)
return 0;
if (!conn->sess->sess_ops->DataPDUInOrder)
return 0;
mbl = conn->sess->sess_ops->MaxBurstLength;
}
@ -706,6 +681,53 @@ static int cxgbit_set_iso_npdu(struct cxgbit_sock *csk)
return 0;
}
/*
* cxgbit_seq_pdu_inorder()
* @csk: pointer to cxgbit socket structure
*
* This function checks whether data sequence and data
* pdu are in order.
*
* Return: returns -1 on error, 0 if data sequence and
* data pdu are in order, 1 if data sequence or data pdu
* is not in order.
*/
static int cxgbit_seq_pdu_inorder(struct cxgbit_sock *csk)
{
struct iscsi_conn *conn = csk->conn;
struct iscsi_param *param;
if (conn->login->leading_connection) {
param = iscsi_find_param_from_key(DATASEQUENCEINORDER,
conn->param_list);
if (!param) {
pr_err("param not found key %s\n", DATASEQUENCEINORDER);
return -1;
}
if (strcmp(param->value, YES))
return 1;
param = iscsi_find_param_from_key(DATAPDUINORDER,
conn->param_list);
if (!param) {
pr_err("param not found key %s\n", DATAPDUINORDER);
return -1;
}
if (strcmp(param->value, YES))
return 1;
} else {
if (!conn->sess->sess_ops->DataSequenceInOrder)
return 1;
if (!conn->sess->sess_ops->DataPDUInOrder)
return 1;
}
return 0;
}
static int cxgbit_set_params(struct iscsi_conn *conn)
{
struct cxgbit_sock *csk = conn->context;
@ -732,11 +754,24 @@ static int cxgbit_set_params(struct iscsi_conn *conn)
}
if (!erl) {
int ret;
ret = cxgbit_seq_pdu_inorder(csk);
if (ret < 0) {
return -1;
} else if (ret > 0) {
if (is_t5(cdev->lldi.adapter_type))
goto enable_ddp;
else
goto enable_digest;
}
if (test_bit(CDEV_ISO_ENABLE, &cdev->flags)) {
if (cxgbit_set_iso_npdu(csk))
return -1;
}
enable_ddp:
if (test_bit(CDEV_DDP_ENABLE, &cdev->flags)) {
if (cxgbit_setup_conn_pgidx(csk,
ppm->tformat.pgsz_idx_dflt))
@ -745,6 +780,7 @@ static int cxgbit_set_params(struct iscsi_conn *conn)
}
}
enable_digest:
if (cxgbit_set_digest(csk))
return -1;