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Add support for R2T PDUs.

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Update the "send scsi command" fucntion to honour
"FirstBurstLength" so that we only send this many bytes as unsolicited data.

The wait for a train of R2T from the target to clock out additional
busrts of data until the full task data has been sent to the Target.

We should now honour, and handle the case of
ImmediateData=No
InitialR2T=No
correctly for targets that are limited on receiveing data too fast.
This commit is contained in:
Ronnie Sahlberg
2011-01-02 19:23:30 +11:00
parent 502843d64a
commit 74fadc9337
4 changed files with 48 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
lib/pdu.c
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@@ -213,6 +213,14 @@ iscsi_process_pdu(struct iscsi_context *iscsi, struct iscsi_in_pdu *in)
expected_response = ISCSI_PDU_DATA_IN;
}
/* Another special case is if we get a R2T.
* In this case we should find the original request and just send an additional
* DATAOUT segment for this task.
*/
if (opcode == ISCSI_PDU_R2T) {
expected_response = ISCSI_PDU_R2T;
}
if (opcode != expected_response) {
iscsi_set_error(iscsi, "Got wrong opcode back for "
"itt:%d got:%d expected %d",
@@ -274,9 +282,19 @@ iscsi_process_pdu(struct iscsi_context *iscsi, struct iscsi_in_pdu *in)
return -1;
}
break;
case ISCSI_PDU_R2T:
if (iscsi_process_r2t(iscsi, pdu, in) != 0) {
SLIST_REMOVE(&iscsi->waitpdu, pdu);
iscsi_free_pdu(iscsi, pdu);
iscsi_set_error(iscsi, "iscsi r2t "
"failed");
return -1;
}
is_finished = 0;
break;
default:
iscsi_set_error(iscsi, "Dont know how to handle "
"opcode %d", opcode);
"opcode 0x%02x", opcode);
return -1;
}