From 8fe443a5d82568d33d27f2bf9fc946e6324d46aa Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Tue, 11 Nov 2025 09:49:45 +0100
Subject: [SERVER] iscsi: Report read cache enabled; report maximum prefetch

ctld is also reporting maximum prefetch values, so let's just do the
same.
---
 src/server/iscsi.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

(limited to 'src/server')

diff --git a/src/server/iscsi.c b/src/server/iscsi.c
index 87c0a74..f1199d6 100644
--- a/src/server/iscsi.c
+++ b/src/server/iscsi.c
@@ -1641,14 +1641,20 @@ static int iscsi_scsi_emu_primary_mode_sense_page(dnbd3_image_t *image, iscsi_sc
 			if ( sub_page != 0U )
 				break;
 
-			iscsi_scsi_mode_sense_caching_mode_page_data_packet *mode_sense_caching_mode_page_pkt = (iscsi_scsi_mode_sense_caching_mode_page_data_packet *) buffer;
+			iscsi_scsi_mode_sense_caching_mode_page_data_packet *cache_page = (iscsi_scsi_mode_sense_caching_mode_page_data_packet *) buffer;
 
-			page_len = sizeof(iscsi_scsi_mode_sense_caching_mode_page_data_packet);
+			page_len = sizeof(*cache_page);
 
 			iscsi_scsi_emu_primary_mode_sense_page_init( buffer, page_len, page, sub_page );
 
-			if ( (buffer != NULL) && (pc != ISCSI_SCSI_CDB_MODE_SENSE_6_PAGE_CONTROL_CHG_VALUES) )
-				mode_sense_caching_mode_page_pkt->flags |= ISCSI_SCSI_MODE_SENSE_CACHING_MODE_PAGE_FLAGS_RCD;
+			if ( cache_page != NULL ) {
+				cache_page->flags |= ISCSI_SCSI_MODE_SENSE_CACHING_MODE_PAGE_FLAGS_DISC;
+				// 0xffff is endian-agnostic, don't need to convert
+				cache_page->disable_prefetch_xfer_len = 0xffff;
+				cache_page->min_prefetch = 0xffff;
+				cache_page->max_prefetch = 0xffff;
+				cache_page->max_prefetch_ceil = 0xffff;
+			}
 
 			len += page_len;
 
-- 
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