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iscsi-target: Change iscsi_target_seq_pdu_list.c to honor MaxXmitDataSegmentLength 

This patch converts iscsi_target_seq_pdu_list.c code for DataSequenceInOrder=No +
DataPDUInOrder=No operation to honor the MaxXmitDataSegmentLength value
for iscsi_cmd->se_cmd.data_direction == DMA_TO_DEVICE cases.

Cc: Mike Christie <michaelc@cs.wisc.edu>
Cc: Andy Grover <agrover@redhat.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2012-09-29 22:34:10 -07:00
parent 1c417f39c1
commit b094a4bd84
1 changed files with 31 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

61
drivers/target/iscsi/iscsi_target_seq_pdu_list.c
View File

@ -219,8 +219,14 @@ static void iscsit_determine_counts_for_list(
int check_immediate = 0;
u32 burstlength = 0, offset = 0;
u32 unsolicited_data_length = 0;
u32 mdsl;
struct iscsi_conn *conn = cmd->conn;
if (cmd->se_cmd.data_direction == DMA_TO_DEVICE)
mdsl = cmd->conn->conn_ops->MaxXmitDataSegmentLength;
else
mdsl = cmd->conn->conn_ops->MaxRecvDataSegmentLength;
if ((bl->type == PDULIST_IMMEDIATE) ||
(bl->type == PDULIST_IMMEDIATE_AND_UNSOLICITED))
check_immediate = 1;
@ -243,14 +249,13 @@ static void iscsit_determine_counts_for_list(
continue;
}
if (unsolicited_data_length > 0) {
if ((offset + conn->conn_ops->MaxRecvDataSegmentLength)
>= cmd->se_cmd.data_length) {
if ((offset + mdsl) >= cmd->se_cmd.data_length) {
unsolicited_data_length -=
(cmd->se_cmd.data_length - offset);
offset += (cmd->se_cmd.data_length - offset);
continue;
}
if ((offset + conn->conn_ops->MaxRecvDataSegmentLength)
if ((offset + mdsl)
>= conn->sess->sess_ops->FirstBurstLength) {
unsolicited_data_length -=
(conn->sess->sess_ops->FirstBurstLength -
@ -262,17 +267,15 @@ static void iscsit_determine_counts_for_list(
continue;
}
offset += conn->conn_ops->MaxRecvDataSegmentLength;
unsolicited_data_length -=
conn->conn_ops->MaxRecvDataSegmentLength;
offset += mdsl;
unsolicited_data_length -= mdsl;
continue;
}
if ((offset + conn->conn_ops->MaxRecvDataSegmentLength) >=
cmd->se_cmd.data_length) {
if ((offset + mdsl) >= cmd->se_cmd.data_length) {
offset += (cmd->se_cmd.data_length - offset);
continue;
}
if ((burstlength + conn->conn_ops->MaxRecvDataSegmentLength) >=
if ((burstlength + mdsl) >=
conn->sess->sess_ops->MaxBurstLength) {
offset += (conn->sess->sess_ops->MaxBurstLength -
burstlength);
@ -281,8 +284,8 @@ static void iscsit_determine_counts_for_list(
continue;
}
burstlength += conn->conn_ops->MaxRecvDataSegmentLength;
offset += conn->conn_ops->MaxRecvDataSegmentLength;
burstlength += mdsl;
offset += mdsl;
}
}
@ -296,12 +299,17 @@ static int iscsit_do_build_pdu_and_seq_lists(
struct iscsi_build_list *bl)
{
int check_immediate = 0, datapduinorder, datasequenceinorder;
u32 burstlength = 0, offset = 0, i = 0;
u32 burstlength = 0, offset = 0, i = 0, mdsl;
u32 pdu_count = 0, seq_no = 0, unsolicited_data_length = 0;
struct iscsi_conn *conn = cmd->conn;
struct iscsi_pdu *pdu = cmd->pdu_list;
struct iscsi_seq *seq = cmd->seq_list;
if (cmd->se_cmd.data_direction == DMA_TO_DEVICE)
mdsl = cmd->conn->conn_ops->MaxXmitDataSegmentLength;
else
mdsl = cmd->conn->conn_ops->MaxRecvDataSegmentLength;
datapduinorder = conn->sess->sess_ops->DataPDUInOrder;
datasequenceinorder = conn->sess->sess_ops->DataSequenceInOrder;
@ -348,9 +356,7 @@ static int iscsit_do_build_pdu_and_seq_lists(
continue;
}
if (unsolicited_data_length > 0) {
if ((offset +
conn->conn_ops->MaxRecvDataSegmentLength) >=
cmd->se_cmd.data_length) {
if ((offset + mdsl) >= cmd->se_cmd.data_length) {
if (!datapduinorder) {
pdu[i].type = PDUTYPE_UNSOLICITED;
pdu[i].length =
@ -367,8 +373,7 @@ static int iscsit_do_build_pdu_and_seq_lists(
offset += (cmd->se_cmd.data_length - offset);
continue;
}
if ((offset +
conn->conn_ops->MaxRecvDataSegmentLength) >=
if ((offset + mdsl) >=
conn->sess->sess_ops->FirstBurstLength) {
if (!datapduinorder) {
pdu[i].type = PDUTYPE_UNSOLICITED;
@ -396,17 +401,14 @@ static int iscsit_do_build_pdu_and_seq_lists(
if (!datapduinorder) {
pdu[i].type = PDUTYPE_UNSOLICITED;
pdu[i++].length =
conn->conn_ops->MaxRecvDataSegmentLength;
pdu[i++].length = mdsl;
}
burstlength += conn->conn_ops->MaxRecvDataSegmentLength;
offset += conn->conn_ops->MaxRecvDataSegmentLength;
unsolicited_data_length -=
conn->conn_ops->MaxRecvDataSegmentLength;
burstlength += mdsl;
offset += mdsl;
unsolicited_data_length -= mdsl;
continue;
}
if ((offset + conn->conn_ops->MaxRecvDataSegmentLength) >=
cmd->se_cmd.data_length) {
if ((offset + mdsl) >= cmd->se_cmd.data_length) {
if (!datapduinorder) {
pdu[i].type = PDUTYPE_NORMAL;
pdu[i].length = (cmd->se_cmd.data_length - offset);
@ -420,7 +422,7 @@ static int iscsit_do_build_pdu_and_seq_lists(
offset += (cmd->se_cmd.data_length - offset);
continue;
}
if ((burstlength + conn->conn_ops->MaxRecvDataSegmentLength) >=
if ((burstlength + mdsl) >=
conn->sess->sess_ops->MaxBurstLength) {
if (!datapduinorder) {
pdu[i].type = PDUTYPE_NORMAL;
@ -445,11 +447,10 @@ static int iscsit_do_build_pdu_and_seq_lists(
if (!datapduinorder) {
pdu[i].type = PDUTYPE_NORMAL;
pdu[i++].length =
conn->conn_ops->MaxRecvDataSegmentLength;
pdu[i++].length = mdsl;
}
burstlength += conn->conn_ops->MaxRecvDataSegmentLength;
offset += conn->conn_ops->MaxRecvDataSegmentLength;
burstlength += mdsl;
offset += mdsl;
}
if (!datasequenceinorder) {