Author: trasz
Date: Thu May 26 12:43:15 2016
New Revision: 300737
URL: https://svnweb.freebsd.org/changeset/base/300737
Log:
Add a special case for iSER data tranfers.
Obtained from: Mellanox Technologies
MFC after: 1 month
Sponsored by: The FreeBSD Foundation
Modified:
head/sys/dev/iscsi/iscsi.c
Modified: head/sys/dev/iscsi/iscsi.c
==============================================================================
--- head/sys/dev/iscsi/iscsi.c Thu May 26 12:00:14 2016 (r300736)
+++ head/sys/dev/iscsi/iscsi.c Thu May 26 12:43:15 2016 (r300737)
@@ -866,6 +866,7 @@ iscsi_pdu_handle_scsi_response(struct ic
struct ccb_scsiio *csio;
size_t data_segment_len, received;
uint16_t sense_len;
+ uint32_t resid;
is = PDU_SESSION(response);
@@ -880,6 +881,22 @@ iscsi_pdu_handle_scsi_response(struct ic
}
ccb = io->io_ccb;
+
+ /*
+ * With iSER, after getting good response we can be sure
+ * that all the data has been successfully transferred.
+ */
+ if (is->is_conn->ic_iser) {
+ resid = ntohl(bhssr->bhssr_residual_count);
+ if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_UNDERFLOW) {
+ io->io_received = ccb->csio.dxfer_len - resid;
+ } else if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_OVERFLOW) {
+ ISCSI_SESSION_WARN(is, "overflow: target indicates %d",
resid);
+ } else {
+ io->io_received = ccb->csio.dxfer_len;
+ }
+ }
+
received = io->io_received;
iscsi_outstanding_remove(is, io);
ISCSI_SESSION_UNLOCK(is);
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