[PATCH v2 09/10] net/octeon_ep: set watermark for output queues

[Sathesh Edara]

This patch sets the watermark level for SDP
output queues to send backpressure to NIX,
when available Rx buffers fall below watermark.

Signed-off-by: Sathesh Edara <sedara at marvell.com>
---
 drivers/net/octeon_ep/cnxk_ep_vf.c    | 7 ++++++-
 drivers/net/octeon_ep/otx_ep_common.h | 1 +
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/octeon_ep/cnxk_ep_vf.c b/drivers/net/octeon_ep/cnxk_ep_vf.c
index cadb4ecbf9..92c2d2ca5c 100644
--- a/drivers/net/octeon_ep/cnxk_ep_vf.c
+++ b/drivers/net/octeon_ep/cnxk_ep_vf.c
@@ -245,7 +245,12 @@ cnxk_ep_vf_setup_oq_regs(struct otx_ep_device *otx_ep, uint32_t oq_no)
 	}
 
 	otx_ep_dbg("SDP_R[%d]_sent: %x", oq_no, rte_read32(droq->pkts_sent_reg));
-		return 0;
+
+	/* Set Watermark for backpressure */
+	oct_ep_write64(OTX_EP_OQ_WMARK_MIN,
+		       otx_ep->hw_addr + CNXK_EP_R_OUT_WMARK(oq_no));
+
+	return 0;
 }
 
 static int
diff --git a/drivers/net/octeon_ep/otx_ep_common.h b/drivers/net/octeon_ep/otx_ep_common.h
index 0bf5454a39..81d6857c52 100644
--- a/drivers/net/octeon_ep/otx_ep_common.h
+++ b/drivers/net/octeon_ep/otx_ep_common.h
@@ -23,6 +23,7 @@
 #define OTX_EP_MAX_OQ_DESCRIPTORS   (8192)
 #define OTX_EP_OQ_BUF_SIZE          (2048)
 #define OTX_EP_MIN_RX_BUF_SIZE      (64)
+#define OTX_EP_OQ_WMARK_MIN         (256)
 
 #define OTX_EP_OQ_INFOPTR_MODE      (0)
 #define OTX_EP_OQ_REFIL_THRESHOLD   (16)
-- 
2.31.1