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Date: Sun, 30 Sep 2012 05:58:13 +0000
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: target-devel <target-devel@...r.kernel.org>
Cc: linux-scsi <linux-scsi@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
Mike Christie <michaelc@...wisc.edu>,
Hannes Reinecke <hare@...e.de>,
Roland Dreier <roland@...estorage.com>,
Andy Grover <agrover@...hat.com>,
Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 3/6] iscsi-target: Enable MaxXmitDataSegmentLength operation in login path
From: Nicholas Bellinger <nab@...ux-iscsi.org>
This patch activates MaxXmitDataSegmentLength usage that performs the
following sequence of events:
- Once the incoming initiator's MAXRECVDATASEGMENTLENGTH key is detected
within iscsi_check_acceptor_state(), save the requested MRDSL into
conn->conn_ops->MaxRecvDataSegmentLength
- Next change the outgoing target's MaxRecvDataSegmenthLength key=value
based upon the local TPG's MaxXmitDataSegmentLength attribute value.
- Change iscsi_set_connection_parameters() to skip the assignment of
conn->conn_ops->MaxRecvDataSegmentLength, now setup within
iscsi_check_acceptor_state()
Also update iscsi_decode_text_input() -> iscsi_check_acceptor_state()
code-path to accept struct iscsi_conn *.
Cc: Mike Christie <michaelc@...wisc.edu>
Cc: Andy Grover <agrover@...hat.com>
Cc: Hannes Reinecke <hare@...e.de>
Cc: Roland Dreier <roland@...estorage.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
---
drivers/target/iscsi/iscsi_target_nego.c | 4 +-
drivers/target/iscsi/iscsi_target_parameters.c | 50 +++++++++++++++++++----
drivers/target/iscsi/iscsi_target_parameters.h | 2 +-
3 files changed, 44 insertions(+), 12 deletions(-)
diff --git a/drivers/target/iscsi/iscsi_target_nego.c b/drivers/target/iscsi/iscsi_target_nego.c
index a9a73ac..d08373f 100644
--- a/drivers/target/iscsi/iscsi_target_nego.c
+++ b/drivers/target/iscsi/iscsi_target_nego.c
@@ -550,7 +550,7 @@ static int iscsi_target_handle_csg_zero(
SENDER_INITIATOR|SENDER_RECEIVER,
login->req_buf,
payload_length,
- conn->param_list);
+ conn);
if (ret < 0)
return -1;
@@ -627,7 +627,7 @@ static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_log
SENDER_INITIATOR|SENDER_RECEIVER,
login->req_buf,
payload_length,
- conn->param_list);
+ conn);
if (ret < 0)
return -1;
diff --git a/drivers/target/iscsi/iscsi_target_parameters.c b/drivers/target/iscsi/iscsi_target_parameters.c
index 40864ee..3678ff2 100644
--- a/drivers/target/iscsi/iscsi_target_parameters.c
+++ b/drivers/target/iscsi/iscsi_target_parameters.c
@@ -1065,7 +1065,8 @@ out:
return proposer_values;
}
-static int iscsi_check_acceptor_state(struct iscsi_param *param, char *value)
+static int iscsi_check_acceptor_state(struct iscsi_param *param, char *value,
+ struct iscsi_conn *conn)
{
u8 acceptor_boolean_value = 0, proposer_boolean_value = 0;
char *negoitated_value = NULL;
@@ -1140,8 +1141,35 @@ static int iscsi_check_acceptor_state(struct iscsi_param *param, char *value)
return -1;
}
- if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH))
- SET_PSTATE_REPLY_OPTIONAL(param);
+ if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH)) {
+ struct iscsi_param *param_mxdsl;
+ unsigned long long tmp;
+ int rc;
+
+ rc = strict_strtoull(param->value, 0, &tmp);
+ if (rc < 0)
+ return -1;
+
+ conn->conn_ops->MaxRecvDataSegmentLength = tmp;
+ pr_debug("Saving op->MaxRecvDataSegmentLength from"
+ " original initiator received value: %u\n",
+ conn->conn_ops->MaxRecvDataSegmentLength);
+
+ param_mxdsl = iscsi_find_param_from_key(
+ MAXXMITDATASEGMENTLENGTH,
+ conn->param_list);
+ if (!param_mxdsl)
+ return -1;
+
+ rc = iscsi_update_param_value(param,
+ param_mxdsl->value);
+ if (rc < 0)
+ return -1;
+
+ pr_debug("Updated %s to target MXDSL value: %s\n",
+ param->name, param->value);
+ }
+
} else if (IS_TYPE_NUMBER_RANGE(param)) {
negoitated_value = iscsi_get_value_from_number_range(
param, value);
@@ -1535,8 +1563,9 @@ int iscsi_decode_text_input(
u8 sender,
char *textbuf,
u32 length,
- struct iscsi_param_list *param_list)
+ struct iscsi_conn *conn)
{
+ struct iscsi_param_list *param_list = conn->param_list;
char *tmpbuf, *start = NULL, *end = NULL;
tmpbuf = kzalloc(length + 1, GFP_KERNEL);
@@ -1594,7 +1623,7 @@ int iscsi_decode_text_input(
}
SET_PSTATE_RESPONSE_GOT(param);
} else {
- if (iscsi_check_acceptor_state(param, value) < 0) {
+ if (iscsi_check_acceptor_state(param, value, conn) < 0) {
kfree(tmpbuf);
return -1;
}
@@ -1755,10 +1784,13 @@ void iscsi_set_connection_parameters(
pr_debug("DataDigest: %s\n",
param->value);
} else if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH)) {
- ops->MaxRecvDataSegmentLength =
- simple_strtoul(param->value, &tmpptr, 0);
- pr_debug("MaxRecvDataSegmentLength: %s\n",
- param->value);
+ /*
+ * At this point iscsi_check_acceptor_state() will have
+ * set ops->MaxRecvDataSegmentLength from the original
+ * initiator provided value.
+ */
+ pr_debug("MaxRecvDataSegmentLength: %u\n",
+ ops->MaxRecvDataSegmentLength);
} else if (!strcmp(param->name, OFMARKER)) {
ops->OFMarker = !strcmp(param->value, YES);
pr_debug("OFMarker: %s\n",
diff --git a/drivers/target/iscsi/iscsi_target_parameters.h b/drivers/target/iscsi/iscsi_target_parameters.h
index 77a28b5..1e1b750 100644
--- a/drivers/target/iscsi/iscsi_target_parameters.h
+++ b/drivers/target/iscsi/iscsi_target_parameters.h
@@ -36,7 +36,7 @@ extern void iscsi_release_param_list(struct iscsi_param_list *);
extern struct iscsi_param *iscsi_find_param_from_key(char *, struct iscsi_param_list *);
extern int iscsi_extract_key_value(char *, char **, char **);
extern int iscsi_update_param_value(struct iscsi_param *, char *);
-extern int iscsi_decode_text_input(u8, u8, char *, u32, struct iscsi_param_list *);
+extern int iscsi_decode_text_input(u8, u8, char *, u32, struct iscsi_conn *);
extern int iscsi_encode_text_output(u8, u8, char *, u32 *,
struct iscsi_param_list *);
extern int iscsi_check_negotiated_keys(struct iscsi_param_list *);
--
1.7.2.5
--
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