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iscsi-target: Add base MaxXmitDataSegmentLength code

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This patch introduces a new per connection MaxXmitDataSegmentLength
parameter value used to represent the outgoing MaxRecvDataSegmentLength
that is actually sent over the wire during iSCSI login response back
to the initiator side.

It also adds a new MaxXmitDataSegmentLength configfs attribute to
represent this value within the existing TPG parameter group under
/sys/kernel/config/target/iscsi/$TARGETNAME/$TPGT/param/

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 21:47:16 -07:00
parent b32f4c7ed8
commit e004cb2592
4 changed files with 31 additions and 0 deletions
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21
drivers/target/iscsi/iscsi_target_parameters.c
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@@ -334,6 +334,13 @@ int iscsi_create_default_params(struct iscsi_param_list **param_list_ptr)
if (!param)
goto out;
param = iscsi_set_default_param(pl, MAXXMITDATASEGMENTLENGTH,
INITIAL_MAXXMITDATASEGMENTLENGTH,
PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
TYPERANGE_512_TO_16777215, USE_ALL);
if (!param)
goto out;
param = iscsi_set_default_param(pl, MAXRECVDATASEGMENTLENGTH,
INITIAL_MAXRECVDATASEGMENTLENGTH,
PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
@@ -467,6 +474,8 @@ int iscsi_set_keys_to_negotiate(
SET_PSTATE_NEGOTIATE(param);
} else if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH)) {
SET_PSTATE_NEGOTIATE(param);
} else if (!strcmp(param->name, MAXXMITDATASEGMENTLENGTH)) {
continue;
} else if (!strcmp(param->name, MAXBURSTLENGTH)) {
SET_PSTATE_NEGOTIATE(param);
} else if (!strcmp(param->name, FIRSTBURSTLENGTH)) {
@@ -1720,6 +1729,18 @@ void iscsi_set_connection_parameters(
pr_debug("---------------------------------------------------"
"---------------\n");
list_for_each_entry(param, &param_list->param_list, p_list) {
/*
* Special case to set MAXXMITDATASEGMENTLENGTH from the
* target requested MaxRecvDataSegmentLength, even though
* this key is not sent over the wire.
*/
if (!strcmp(param->name, MAXXMITDATASEGMENTLENGTH)) {
ops->MaxXmitDataSegmentLength =
simple_strtoul(param->value, &tmpptr, 0);
pr_debug("MaxXmitDataSegmentLength: %s\n",
param->value);
}
if (!IS_PSTATE_ACCEPTOR(param) && !IS_PSTATE_PROPOSER(param))
continue;
if (!strcmp(param->name, AUTHMETHOD)) {