From 5248788ec300f7ee738502bfc466dbb9b625247e Mon Sep 17 00:00:00 2001 From: Varun Prakash Date: Fri, 13 Jan 2017 20:53:24 +0530 Subject: [PATCH] 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 Signed-off-by: Bart Van Assche Signed-off-by: Nicholas Bellinger --- drivers/target/iscsi/cxgbit/cxgbit_target.c | 86 ++++++++++++++++++++--------- 1 file changed, 61 insertions(+), 25 deletions(-) diff --git a/drivers/target/iscsi/cxgbit/cxgbit_target.c b/drivers/target/iscsi/cxgbit/cxgbit_target.c index 8ae399d..4780fae 100644 --- a/drivers/target/iscsi/cxgbit/cxgbit_target.c +++ b/drivers/target/iscsi/cxgbit/cxgbit_target.c @@ -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; -- 2.7.4