[dpdk-stable] patch 'net/bnxt: fix Rx timestamp when FIFO pending bit is set' has been queued to stable release 19.11.9

[Christian Ehrhardt <christian.ehrhardt@canonical.com>]

Hi,

FYI, your patch has been queued to stable release 19.11.9

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 05/19/21. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/cpaelzer/dpdk-stable-queue

This queued commit can be viewed at:
https://github.com/cpaelzer/dpdk-stable-queue/commit/bf80db99953489ed4c2d626cc45fa26659260817

Thanks.

Christian Ehrhardt <christian.ehrhardt@canonical.com>

---
From bf80db99953489ed4c2d626cc45fa26659260817 Mon Sep 17 00:00:00 2001
From: Somnath Kotur <somnath.kotur@broadcom.com>
Date: Mon, 26 Apr 2021 11:37:55 +0530
Subject: [PATCH] net/bnxt: fix Rx timestamp when FIFO pending bit is set

[ upstream commit f8120fd07bf0ebdbcfa7e1a46c91df9d611ca940 ]

Fix to clear the Rx FIFO while reading the timestamp.
If the Rx FIFO has pending bit set, keep reading to clear it
and return the last valid timestamp instead of unconditionally
returning an error.

Fixes: b11cceb83a34 ("net/bnxt: support timesync")

Signed-off-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
---
 drivers/net/bnxt/bnxt.h        |  1 +
 drivers/net/bnxt/bnxt_ethdev.c | 38 ++++++++++++++++++++++++++++++----
 2 files changed, 35 insertions(+), 4 deletions(-)

diff --git a/drivers/net/bnxt/bnxt.h b/drivers/net/bnxt/bnxt.h
index 0a0ecaafa8..386d9c3cf0 100644
--- a/drivers/net/bnxt/bnxt.h
+++ b/drivers/net/bnxt/bnxt.h
@@ -271,6 +271,7 @@ struct rte_flow {
 	struct bnxt_vnic_info	*vnic;
 };
 
+#define BNXT_PTP_RX_PND_CNT		10
 #define BNXT_PTP_FLAGS_PATH_TX		0x0
 #define BNXT_PTP_FLAGS_PATH_RX		0x1
 #define BNXT_PTP_FLAGS_CURRENT_TIME	0x2
diff --git a/drivers/net/bnxt/bnxt_ethdev.c b/drivers/net/bnxt/bnxt_ethdev.c
index 29330f5250..10ebf41241 100644
--- a/drivers/net/bnxt/bnxt_ethdev.c
+++ b/drivers/net/bnxt/bnxt_ethdev.c
@@ -3471,6 +3471,38 @@ static int bnxt_get_tx_ts(struct bnxt *bp, uint64_t *ts)
 	return 0;
 }
 
+static int bnxt_clr_rx_ts(struct bnxt *bp, uint64_t *last_ts)
+{
+	struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
+	struct bnxt_pf_info *pf = bp->pf;
+	uint16_t port_id;
+	int i = 0;
+	uint32_t fifo;
+
+	if (!ptp || (bp->flags & BNXT_FLAG_CHIP_P5))
+		return -EINVAL;
+
+	port_id = pf->port_id;
+	fifo = rte_le_to_cpu_32(rte_read32((uint8_t *)bp->bar0 +
+				ptp->rx_mapped_regs[BNXT_PTP_RX_FIFO]));
+	while ((fifo & BNXT_PTP_RX_FIFO_PENDING) && (i < BNXT_PTP_RX_PND_CNT)) {
+		rte_write32(1 << port_id, (uint8_t *)bp->bar0 +
+			    ptp->rx_mapped_regs[BNXT_PTP_RX_FIFO_ADV]);
+		fifo = rte_le_to_cpu_32(rte_read32((uint8_t *)bp->bar0 +
+					ptp->rx_mapped_regs[BNXT_PTP_RX_FIFO]));
+		*last_ts = rte_le_to_cpu_32(rte_read32((uint8_t *)bp->bar0 +
+					ptp->rx_mapped_regs[BNXT_PTP_RX_TS_L]));
+		*last_ts |= (uint64_t)rte_le_to_cpu_32(rte_read32((uint8_t *)bp->bar0 +
+					ptp->rx_mapped_regs[BNXT_PTP_RX_TS_H])) << 32;
+		i++;
+	}
+
+	if (i >= BNXT_PTP_RX_PND_CNT)
+		return -EBUSY;
+
+	return 0;
+}
+
 static int bnxt_get_rx_ts(struct bnxt *bp, uint64_t *ts)
 {
 	struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
@@ -3492,10 +3524,8 @@ static int bnxt_get_rx_ts(struct bnxt *bp, uint64_t *ts)
 
 	fifo = rte_le_to_cpu_32(rte_read32((uint8_t *)bp->bar0 +
 				   ptp->rx_mapped_regs[BNXT_PTP_RX_FIFO]));
-	if (fifo & BNXT_PTP_RX_FIFO_PENDING) {
-/*		bnxt_clr_rx_ts(bp);	  TBD  */
-		return -EBUSY;
-	}
+	if (fifo & BNXT_PTP_RX_FIFO_PENDING)
+		return bnxt_clr_rx_ts(bp, ts);
 
 	*ts = rte_le_to_cpu_32(rte_read32((uint8_t *)bp->bar0 +
 				ptp->rx_mapped_regs[BNXT_PTP_RX_TS_L]));
-- 
2.31.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-05-17 17:40:36.942708022 +0200
+++ 0193-net-bnxt-fix-Rx-timestamp-when-FIFO-pending-bit-is-s.patch	2021-05-17 17:40:29.555812501 +0200
@@ -1 +1 @@
-From f8120fd07bf0ebdbcfa7e1a46c91df9d611ca940 Mon Sep 17 00:00:00 2001
+From bf80db99953489ed4c2d626cc45fa26659260817 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit f8120fd07bf0ebdbcfa7e1a46c91df9d611ca940 ]
+
@@ -12 +13,0 @@
-Cc: stable@dpdk.org
@@ -22 +23 @@
-index bd2dec4d63..72513fe66b 100644
+index 0a0ecaafa8..386d9c3cf0 100644
@@ -25 +26 @@
-@@ -306,6 +306,7 @@ struct rte_flow {
+@@ -271,6 +271,7 @@ struct rte_flow {
@@ -34 +35 @@
-index dba5b9f94d..748b766969 100644
+index 29330f5250..10ebf41241 100644
@@ -37 +38 @@
-@@ -3390,6 +3390,38 @@ static int bnxt_get_tx_ts(struct bnxt *bp, uint64_t *ts)
+@@ -3471,6 +3471,38 @@ static int bnxt_get_tx_ts(struct bnxt *bp, uint64_t *ts)
@@ -76 +77 @@
-@@ -3408,10 +3440,8 @@ static int bnxt_get_rx_ts(struct bnxt *bp, uint64_t *ts)
+@@ -3492,10 +3524,8 @@ static int bnxt_get_rx_ts(struct bnxt *bp, uint64_t *ts)