patch 'net/ice: fix scalar Tx path segment' has been queued to stable release 21.11.3

[Kevin Traynor <ktraynor@redhat.com>]

Hi,

FYI, your patch has been queued to stable release 21.11.3

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/28/22. 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/kevintraynor/dpdk-stable

This queued commit can be viewed at:
https://github.com/kevintraynor/dpdk-stable/commit/1f7763504a9acc4f793b60ceee2c6b101e7c7b1d

Thanks.

Kevin

---
From 1f7763504a9acc4f793b60ceee2c6b101e7c7b1d Mon Sep 17 00:00:00 2001
From: Mingjin Ye <mingjinx.ye@intel.com>
Date: Fri, 11 Nov 2022 16:12:41 +0000
Subject: [PATCH] net/ice: fix scalar Tx path segment

[ upstream commit 688cb2f2c61e48552fb9a211fdcfdb754a795b40 ]

The scalar Tx path would send empty buffer that causes the Tx queue to
overflow.

This patch adds the last buffer length judgment in tx_prepare to fix this
issue, rte_errno will be set to EINVAL and returned if the last buffer is
empty.

Fixes: 17c7d0f9d6a4 ("net/ice: support basic Rx/Tx")
Fixes: ccf33dccf7aa ("net/ice: check illegal packet sizes")

Signed-off-by: Mingjin Ye <mingjinx.ye@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>
---
 drivers/net/ice/ice_rxtx.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/net/ice/ice_rxtx.c b/drivers/net/ice/ice_rxtx.c
index b91e6eaad5..ae2701f5e4 100644
--- a/drivers/net/ice/ice_rxtx.c
+++ b/drivers/net/ice/ice_rxtx.c
@@ -3460,4 +3460,20 @@ ice_set_tx_function_flag(struct rte_eth_dev *dev, struct ice_tx_queue *txq)
 #define ICE_MAX_TSO_MSS            9728
 #define ICE_MAX_TSO_FRAME_SIZE     262144
+
+/*Check for empty mbuf*/
+static inline uint16_t
+ice_check_empty_mbuf(struct rte_mbuf *tx_pkt)
+{
+	struct rte_mbuf *txd = tx_pkt;
+
+	while (txd != NULL) {
+		if (txd->data_len == 0)
+			return -1;
+		txd = txd->next;
+	}
+
+	return 0;
+}
+
 uint16_t
 ice_prep_pkts(__rte_unused void *tx_queue, struct rte_mbuf **tx_pkts,
@@ -3506,4 +3522,10 @@ ice_prep_pkts(__rte_unused void *tx_queue, struct rte_mbuf **tx_pkts,
 			return i;
 		}
+
+		if (ice_check_empty_mbuf(m) != 0) {
+			rte_errno = EINVAL;
+			PMD_DRV_LOG(ERR, "INVALID mbuf:	last mbuf data_len=[0]");
+			return i;
+		}
 	}
 	return i;
-- 
2.38.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2022-11-23 09:55:57.670765585 +0000
+++ 0024-net-ice-fix-scalar-Tx-path-segment.patch	2022-11-23 09:55:57.063149292 +0000
@@ -1 +1 @@
-From 688cb2f2c61e48552fb9a211fdcfdb754a795b40 Mon Sep 17 00:00:00 2001
+From 1f7763504a9acc4f793b60ceee2c6b101e7c7b1d Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 688cb2f2c61e48552fb9a211fdcfdb754a795b40 ]
+
@@ -15 +16,0 @@
-Cc: stable@dpdk.org
@@ -24 +25 @@
-index 3224a02db2..0ea0045836 100644
+index b91e6eaad5..ae2701f5e4 100644
@@ -27 +28 @@
-@@ -3646,4 +3646,20 @@ ice_set_tx_function_flag(struct rte_eth_dev *dev, struct ice_tx_queue *txq)
+@@ -3460,4 +3460,20 @@ ice_set_tx_function_flag(struct rte_eth_dev *dev, struct ice_tx_queue *txq)
@@ -48 +49 @@
-@@ -3692,4 +3708,10 @@ ice_prep_pkts(__rte_unused void *tx_queue, struct rte_mbuf **tx_pkts,
+@@ -3506,4 +3522,10 @@ ice_prep_pkts(__rte_unused void *tx_queue, struct rte_mbuf **tx_pkts,