[net PATCH] octeontx2-af: Do NIX_RX_SW_SYNC twice

NIX_RX_SW_SYNC ensures all existing transactions are finished and
pkts are written to LLC/DRAM, queues should be teared down after
successful SW_SYNC. Due to a HW errata, in some rare scenarios
an existing transaction might end after SW_SYNC operation. To
ensure operation is fully done, do the SW_SYNC twice.

Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
---
 drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
index 3006766..4bfbbdf 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c

@@ -196,11 +196,22 @@ static void nix_rx_sync(struct rvu *rvu, int blkaddr)
 {
 	int err;
 
-	/*Sync all in flight RX packets to LLC/DRAM */
+	/* Sync all in flight RX packets to LLC/DRAM */
 	rvu_write64(rvu, blkaddr, NIX_AF_RX_SW_SYNC, BIT_ULL(0));
 	err = rvu_poll_reg(rvu, blkaddr, NIX_AF_RX_SW_SYNC, BIT_ULL(0), true);
 	if (err)
-		dev_err(rvu->dev, "NIX RX software sync failed\n");
+		dev_err(rvu->dev, "SYNC1: NIX RX software sync failed\n");
+
+	/* SW_SYNC ensures all existing transactions are finished and pkts
+	 * are written to LLC/DRAM, queues should be teared down after
+	 * successful SW_SYNC. Due to a HW errata, in some rare scenarios
+	 * an existing transaction might end after SW_SYNC operation. To
+	 * ensure operation is fully done, do the SW_SYNC twice.
+	 */
+	rvu_write64(rvu, blkaddr, NIX_AF_RX_SW_SYNC, BIT_ULL(0));
+	err = rvu_poll_reg(rvu, blkaddr, NIX_AF_RX_SW_SYNC, BIT_ULL(0), true);
+	if (err)
+		dev_err(rvu->dev, "SYNC2: NIX RX software sync failed\n");
 }
 
 static bool is_valid_txschq(struct rvu *rvu, int blkaddr,

-- 
2.7.4

Hello:

This patch was applied to netdev/net.git (refs/heads/master):

On Sun, 25 Jul 2021 18:54:52 +0530 you wrote:

NIX_RX_SW_SYNC ensures all existing transactions are finished and
pkts are written to LLC/DRAM, queues should be teared down after
successful SW_SYNC. Due to a HW errata, in some rare scenarios
an existing transaction might end after SW_SYNC operation. To
ensure operation is fully done, do the SW_SYNC twice.

Signed-off-by: Sunil Goutham <sgoutham@marvell.com>

[...]

Here is the summary with links:
  - [net] octeontx2-af: Do NIX_RX_SW_SYNC twice
    https://git.kernel.org/netdev/net/c/fcef709c2c4b

You are awesome, thank you!
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