scsi: target: cxgbit: Increase max DataSegmentLength

Current value of max DataSegmentLength is 8K. T5/T6 adapters support
DataSegmentLength upto 16K. Increase max DataSegmentLength.

Link: https://lore.kernel.org/r/1634135087-4996-1-git-send-email-varun@chelsio.com
Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/target/iscsi/cxgbit/cxgbit_main.c b/drivers/target/iscsi/cxgbit/cxgbit_main.c
index bd37f2afadeaff98968274cf3c017d85dff8232d..c6678dc8dd418402edea26d5619743eaeac9a6e0 100644 (file)
--- a/drivers/target/iscsi/cxgbit/cxgbit_main.c
+++ b/drivers/target/iscsi/cxgbit/cxgbit_main.c
@@ -33,11 +33,18 @@ static void cxgbit_set_mdsl(struct cxgbit_device *cdev)
        struct cxgb4_lld_info *lldi = &cdev->lldi;
        u32 mdsl;
 
-#define ULP2_MAX_PKT_LEN 16224
-#define ISCSI_PDU_NONPAYLOAD_LEN 312
-       mdsl = min_t(u32, lldi->iscsi_iolen - ISCSI_PDU_NONPAYLOAD_LEN,
-                    ULP2_MAX_PKT_LEN - ISCSI_PDU_NONPAYLOAD_LEN);
-       mdsl = min_t(u32, mdsl, 8192);
+#define CXGBIT_T5_MAX_PDU_LEN 16224
+#define CXGBIT_PDU_NONPAYLOAD_LEN 312 /* 48(BHS) + 256(AHS) + 8(Digest) */
+       if (is_t5(lldi->adapter_type)) {
+               mdsl = min_t(u32, lldi->iscsi_iolen - CXGBIT_PDU_NONPAYLOAD_LEN,
+                            CXGBIT_T5_MAX_PDU_LEN - CXGBIT_PDU_NONPAYLOAD_LEN);
+       } else {
+               mdsl = lldi->iscsi_iolen - CXGBIT_PDU_NONPAYLOAD_LEN;
+               mdsl = min(mdsl, 16384U);
+       }
+
+       mdsl = round_down(mdsl, 4);
+       mdsl = min_t(u32, mdsl, 4 * PAGE_SIZE);
        mdsl = min_t(u32, mdsl, (MAX_SKB_FRAGS - 1) * PAGE_SIZE);
 
        cdev->mdsl = mdsl;