[PATCH 23/26] lpfc: Update stat accounting for READ_STATUS mbox command

[James Smart <jsmart2021@gmail.com>]

READ_STATUS tx/rx byte count fields are now expanded to 64 bit wide
counters.  This patch updates logic for the READ_STATUS mbox command when
displaying tx_word and rx_word statistics in sysfs.

Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
---
 drivers/scsi/lpfc/lpfc_attr.c | 35 ++++++++++++++++++++++++---------
 drivers/scsi/lpfc/lpfc_hw.h   | 37 ++++++++++++++++++++++++-----------
 2 files changed, 52 insertions(+), 20 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
index 0d19e469386b..c8fa579168c6 100644
--- a/drivers/scsi/lpfc/lpfc_attr.c
+++ b/drivers/scsi/lpfc/lpfc_attr.c
@@ -6885,17 +6885,34 @@ lpfc_get_stats(struct Scsi_Host *shost)
 	memset(hs, 0, sizeof (struct fc_host_statistics));
 
 	hs->tx_frames = pmb->un.varRdStatus.xmitFrameCnt;
+	hs->rx_frames = pmb->un.varRdStatus.rcvFrameCnt;
+
 	/*
-	 * The MBX_READ_STATUS returns tx_k_bytes which has to
-	 * converted to words
+	 * The MBX_READ_STATUS returns tx_k_bytes which has to be
+	 * converted to words.
+	 *
+	 * Check if extended byte flag is set, to know when to collect upper
+	 * bits of 64 bit wide statistics counter.
 	 */
-	hs->tx_words = (uint64_t)
-			((uint64_t)pmb->un.varRdStatus.xmitByteCnt
-			* (uint64_t)256);
-	hs->rx_frames = pmb->un.varRdStatus.rcvFrameCnt;
-	hs->rx_words = (uint64_t)
-			((uint64_t)pmb->un.varRdStatus.rcvByteCnt
-			 * (uint64_t)256);
+	if (pmb->un.varRdStatus.xkb & RD_ST_XKB) {
+		hs->tx_words = (u64)
+			       ((((u64)(pmb->un.varRdStatus.xmit_xkb &
+					RD_ST_XMIT_XKB_MASK) << 32) |
+				(u64)pmb->un.varRdStatus.xmitByteCnt) *
+				(u64)256);
+		hs->rx_words = (u64)
+			       ((((u64)(pmb->un.varRdStatus.rcv_xkb &
+					RD_ST_RCV_XKB_MASK) << 32) |
+				(u64)pmb->un.varRdStatus.rcvByteCnt) *
+				(u64)256);
+	} else {
+		hs->tx_words = (uint64_t)
+				((uint64_t)pmb->un.varRdStatus.xmitByteCnt
+				* (uint64_t)256);
+		hs->rx_words = (uint64_t)
+				((uint64_t)pmb->un.varRdStatus.rcvByteCnt
+				 * (uint64_t)256);
+	}
 
 	memset(pmboxq, 0, sizeof (LPFC_MBOXQ_t));
 	pmb->mbxCommand = MBX_READ_LNK_STAT;
diff --git a/drivers/scsi/lpfc/lpfc_hw.h b/drivers/scsi/lpfc/lpfc_hw.h
index 70c3dd7b7105..748c53219986 100644
--- a/drivers/scsi/lpfc/lpfc_hw.h
+++ b/drivers/scsi/lpfc/lpfc_hw.h
@@ -2648,19 +2648,26 @@ typedef struct {
 } READ_SPARM_VAR;
 
 /* Structure for MB Command READ_STATUS (14) */
+enum read_status_word1 {
+	RD_ST_CC	= 0x01,
+	RD_ST_XKB	= 0x80,
+};
+
+enum read_status_word17 {
+	RD_ST_XMIT_XKB_MASK = 0x3fffff,
+};
+
+enum read_status_word18 {
+	RD_ST_RCV_XKB_MASK = 0x3fffff,
+};
 
 typedef struct {
-#ifdef __BIG_ENDIAN_BITFIELD
-	uint32_t rsvd1:31;
-	uint32_t clrCounters:1;
-	uint16_t activeXriCnt;
-	uint16_t activeRpiCnt;
-#else	/*  __LITTLE_ENDIAN_BITFIELD */
-	uint32_t clrCounters:1;
-	uint32_t rsvd1:31;
-	uint16_t activeRpiCnt;
-	uint16_t activeXriCnt;
-#endif
+	u8 clear_counters; /* rsvd 7:1, cc 0 */
+	u8 rsvd5;
+	u8 rsvd6;
+	u8 xkb; /* xkb 7, rsvd 6:0 */
+
+	u32 rsvd8;
 
 	uint32_t xmitByteCnt;
 	uint32_t rcvByteCnt;
@@ -2672,6 +2679,14 @@ typedef struct {
 	uint32_t totalRespExchanges;
 	uint32_t rcvPbsyCnt;
 	uint32_t rcvFbsyCnt;
+
+	u32 drop_frame_no_rq;
+	u32 empty_rq;
+	u32 drop_frame_no_xri;
+	u32 empty_xri;
+
+	u32 xmit_xkb; /* rsvd 31:22, xmit_xkb 21:0 */
+	u32 rcv_xkb; /* rsvd 31:22, rcv_xkb 21:0 */
 } READ_STATUS_VAR;
 
 /* Structure for MB Command READ_RPI (15) */
-- 
2.26.2