[dpdk-stable] patch 'net/ixgbe: fix flex bytes flow director rule' has been queued to stable release 20.11.1

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 20.11.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 02/07/21. 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/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/85b6748f06dd7f448311e489286a62a98da8dbdb

Thanks.

Luca Boccassi

---
>From 85b6748f06dd7f448311e489286a62a98da8dbdb Mon Sep 17 00:00:00 2001
From: Dapeng Yu <dapengx.yu at intel.com>
Date: Tue, 15 Dec 2020 18:10:31 +0800
Subject: [PATCH] net/ixgbe: fix flex bytes flow director rule

[ upstream commit 06cad275fecf4e1892b076796065942cdc1ef44e ]

When a flexbytes flow director rule is created, the FDIRCTRL.FLEX_OFFSET
register is set, and it keeps its affect even after the flow director
flexbytes rule is destroyed, causing packets to be transferred to the
wrong place.

It is because setting FDIRCTRL shall only be permitted on Flow Director
initialization flow or clearing the Flow Director table according to the
datasheet, otherwise device may behave unexpectedly.

In order to evade this limitation, simulate the Flow Director
initialization flow or clearing the Flow Director table by setting
FDIRCMD.CLEARHT to 0x1B and then clear it back to 0x0B.

Fixes: f35fec63dde1 ("net/ixgbe: enable flex bytes for generic flow API")

Signed-off-by: Dapeng Yu <dapengx.yu at intel.com>
Tested-by: Jun W Zhou <junx.w.zhou at intel.com>
Acked-by: Jeff Guo <jia.guo at intel.com>
---
 drivers/net/ixgbe/ixgbe_fdir.c | 29 +++++++++++++++++++++++++++++
 drivers/net/ixgbe/ixgbe_flow.c | 15 ++++++++-------
 2 files changed, 37 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe_fdir.c b/drivers/net/ixgbe/ixgbe_fdir.c
index a0fab5070d..11b9effeba 100644
--- a/drivers/net/ixgbe/ixgbe_fdir.c
+++ b/drivers/net/ixgbe/ixgbe_fdir.c
@@ -503,9 +503,30 @@ ixgbe_fdir_set_flexbytes_offset(struct rte_eth_dev *dev,
 				uint16_t offset)
 {
 	struct ixgbe_hw *hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct ixgbe_hw_fdir_info *fdir_info =
+		IXGBE_DEV_PRIVATE_TO_FDIR_INFO(dev->data->dev_private);
 	uint32_t fdirctrl;
 	int i;
 
+	if (fdir_info->flex_bytes_offset == offset)
+		return 0;
+
+	/**
+	 * 82599 adapters flow director init flow cannot be restarted,
+	 * Workaround 82599 silicon errata by performing the following steps
+	 * before re-writing the FDIRCTRL control register with the same value.
+	 * - write 1 to bit 8 of FDIRCMD register &
+	 * - write 0 to bit 8 of FDIRCMD register
+	 */
+	IXGBE_WRITE_REG(hw, IXGBE_FDIRCMD,
+			(IXGBE_READ_REG(hw, IXGBE_FDIRCMD) |
+			 IXGBE_FDIRCMD_CLEARHT));
+	IXGBE_WRITE_FLUSH(hw);
+	IXGBE_WRITE_REG(hw, IXGBE_FDIRCMD,
+			(IXGBE_READ_REG(hw, IXGBE_FDIRCMD) &
+			 ~IXGBE_FDIRCMD_CLEARHT));
+	IXGBE_WRITE_FLUSH(hw);
+
 	fdirctrl = IXGBE_READ_REG(hw, IXGBE_FDIRCTRL);
 
 	fdirctrl &= ~IXGBE_FDIRCTRL_FLEX_MASK;
@@ -520,6 +541,14 @@ ixgbe_fdir_set_flexbytes_offset(struct rte_eth_dev *dev,
 			break;
 		msec_delay(1);
 	}
+
+	if (i >= IXGBE_FDIR_INIT_DONE_POLL) {
+		PMD_DRV_LOG(ERR, "Flow Director poll time exceeded!");
+		return -ETIMEDOUT;
+	}
+
+	fdir_info->flex_bytes_offset = offset;
+
 	return 0;
 }
 
diff --git a/drivers/net/ixgbe/ixgbe_flow.c b/drivers/net/ixgbe/ixgbe_flow.c
index 39f6ed73f6..9aeb2e4a49 100644
--- a/drivers/net/ixgbe/ixgbe_flow.c
+++ b/drivers/net/ixgbe/ixgbe_flow.c
@@ -3137,13 +3137,13 @@ ixgbe_flow_create(struct rte_eth_dev *dev,
 				rte_memcpy(&fdir_info->mask,
 					&fdir_rule.mask,
 					sizeof(struct ixgbe_hw_fdir_mask));
-				fdir_info->flex_bytes_offset =
-					fdir_rule.flex_bytes_offset;
 
-				if (fdir_rule.mask.flex_bytes_mask)
-					ixgbe_fdir_set_flexbytes_offset(dev,
+				if (fdir_rule.mask.flex_bytes_mask) {
+					ret = ixgbe_fdir_set_flexbytes_offset(dev,
 						fdir_rule.flex_bytes_offset);
-
+					if (ret)
+						goto out;
+				}
 				ret = ixgbe_fdir_set_input_mask(dev);
 				if (ret)
 					goto out;
@@ -3161,8 +3161,9 @@ ixgbe_flow_create(struct rte_eth_dev *dev,
 				if (ret)
 					goto out;
 
-				if (fdir_info->flex_bytes_offset !=
-						fdir_rule.flex_bytes_offset)
+				if (fdir_rule.mask.flex_bytes_mask &&
+				    fdir_info->flex_bytes_offset !=
+				    fdir_rule.flex_bytes_offset)
 					goto out;
 			}
 		}
-- 
2.29.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-02-05 11:18:32.019403947 +0000
+++ 0061-net-ixgbe-fix-flex-bytes-flow-director-rule.patch	2021-02-05 11:18:28.806691112 +0000
@@ -1 +1 @@
-From 06cad275fecf4e1892b076796065942cdc1ef44e Mon Sep 17 00:00:00 2001
+From 85b6748f06dd7f448311e489286a62a98da8dbdb Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 06cad275fecf4e1892b076796065942cdc1ef44e ]
+
@@ -20 +21,0 @@
-Cc: stable at dpdk.org