[dpdk-stable] patch 'net/bonding: fix RSS key length' has been queued to stable release 20.11.4

[Xueming Li]

Hi,

FYI, your patch has been queued to stable release 20.11.4

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/12/21. 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/steevenlee/dpdk

This queued commit can be viewed at:
https://github.com/steevenlee/dpdk/commit/709c5b655fe8e51cdca93ea063a58099c8996932

Thanks.

Xueming Li <xuemingl at nvidia.com>

---
>From 709c5b655fe8e51cdca93ea063a58099c8996932 Mon Sep 17 00:00:00 2001
From: Chengchang Tang <tangchengchang at huawei.com>
Date: Wed, 22 Sep 2021 15:09:13 +0800
Subject: [PATCH] net/bonding: fix RSS key length
Cc: Xueming Li <xuemingl at nvidia.com>

[ upstream commit 6b1a001ec54635d63ed3f91eaef5164abee7a089 ]

Currently the hash_key_size information has not been set. So, apps can
not get the key size from dev_info(), this make some problem.

e.g, in testpmd, the hash_key_size will be checked before configure
or get the hash key:
testpmd> show port 4 rss-hash
dev_info did not provide a valid hash key size
testpmd> show port 4 rss-hash key
dev_info did not provide a valid hash key size
testpmd> port config 4 rss-hash-key ipv4 (hash key)
dev_info did not provide a valid hash key size

In this patch, the meaning of rss_key_len has been modified. It only
indicated the length of the configured hash key before. Therefore,
its value depends on the user's configuration. This seems unreasonable.
And now, it indicates the minimum hash key length required by the
bonded device. Its value will be the shortest hash key among all slave
drivers.

Fixes: 734ce47f71e0 ("bonding: support RSS dynamic configuration")

Signed-off-by: Chengchang Tang <tangchengchang at huawei.com>
Signed-off-by: Min Hu (Connor) <humin29 at huawei.com>
---
 drivers/net/bonding/rte_eth_bond_api.c |  6 ++++
 drivers/net/bonding/rte_eth_bond_pmd.c | 44 ++++++++++++++++----------
 2 files changed, 33 insertions(+), 17 deletions(-)

diff --git a/drivers/net/bonding/rte_eth_bond_api.c b/drivers/net/bonding/rte_eth_bond_api.c
index 44775f61e5..c751a1242d 100644
--- a/drivers/net/bonding/rte_eth_bond_api.c
+++ b/drivers/net/bonding/rte_eth_bond_api.c
@@ -290,6 +290,7 @@ eth_bond_slave_inherit_dev_info_rx_first(struct bond_dev_private *internals,
 	struct rte_eth_rxconf *rxconf_i = &internals->default_rxconf;
 
 	internals->reta_size = di->reta_size;
+	internals->rss_key_len = di->hash_key_size;
 
 	/* Inherit Rx offload capabilities from the first slave device */
 	internals->rx_offload_capa = di->rx_offload_capa;
@@ -385,6 +386,11 @@ eth_bond_slave_inherit_dev_info_rx_next(struct bond_dev_private *internals,
 	 */
 	if (internals->reta_size > di->reta_size)
 		internals->reta_size = di->reta_size;
+	if (internals->rss_key_len > di->hash_key_size) {
+		RTE_BOND_LOG(WARNING, "slave has different rss key size, "
+				"configuring rss may fail");
+		internals->rss_key_len = di->hash_key_size;
+	}
 
 	if (!internals->max_rx_pktlen &&
 	    di->max_rx_pktlen < internals->candidate_max_rx_pktlen)
diff --git a/drivers/net/bonding/rte_eth_bond_pmd.c b/drivers/net/bonding/rte_eth_bond_pmd.c
index baa01b17e5..fb430be549 100644
--- a/drivers/net/bonding/rte_eth_bond_pmd.c
+++ b/drivers/net/bonding/rte_eth_bond_pmd.c
@@ -1705,14 +1705,11 @@ slave_configure(struct rte_eth_dev *bonded_eth_dev,
 
 	/* If RSS is enabled for bonding, try to enable it for slaves  */
 	if (bonded_eth_dev->data->dev_conf.rxmode.mq_mode & ETH_MQ_RX_RSS_FLAG) {
-		if (internals->rss_key_len != 0) {
-			slave_eth_dev->data->dev_conf.rx_adv_conf.rss_conf.rss_key_len =
+		/* rss_key won't be empty if RSS is configured in bonded dev */
+		slave_eth_dev->data->dev_conf.rx_adv_conf.rss_conf.rss_key_len =
 					internals->rss_key_len;
-			slave_eth_dev->data->dev_conf.rx_adv_conf.rss_conf.rss_key =
+		slave_eth_dev->data->dev_conf.rx_adv_conf.rss_conf.rss_key =
 					internals->rss_key;
-		} else {
-			slave_eth_dev->data->dev_conf.rx_adv_conf.rss_conf.rss_key = NULL;
-		}
 
 		slave_eth_dev->data->dev_conf.rx_adv_conf.rss_conf.rss_hf =
 				bonded_eth_dev->data->dev_conf.rx_adv_conf.rss_conf.rss_hf;
@@ -2244,6 +2241,7 @@ bond_ethdev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 	dev_info->flow_type_rss_offloads = internals->flow_type_rss_offloads;
 
 	dev_info->reta_size = internals->reta_size;
+	dev_info->hash_key_size = internals->rss_key_len;
 
 	return 0;
 }
@@ -3033,13 +3031,15 @@ bond_ethdev_rss_hash_update(struct rte_eth_dev *dev,
 	if (bond_rss_conf.rss_hf != 0)
 		dev->data->dev_conf.rx_adv_conf.rss_conf.rss_hf = bond_rss_conf.rss_hf;
 
-	if (bond_rss_conf.rss_key && bond_rss_conf.rss_key_len <
-			sizeof(internals->rss_key)) {
-		if (bond_rss_conf.rss_key_len == 0)
-			bond_rss_conf.rss_key_len = 40;
-		internals->rss_key_len = bond_rss_conf.rss_key_len;
+	if (bond_rss_conf.rss_key) {
+		if (bond_rss_conf.rss_key_len < internals->rss_key_len)
+			return -EINVAL;
+		else if (bond_rss_conf.rss_key_len > internals->rss_key_len)
+			RTE_BOND_LOG(WARNING, "rss_key will be truncated");
+
 		memcpy(internals->rss_key, bond_rss_conf.rss_key,
 				internals->rss_key_len);
+		bond_rss_conf.rss_key_len = internals->rss_key_len;
 	}
 
 	for (i = 0; i < internals->slave_count; i++) {
@@ -3502,14 +3502,24 @@ bond_ethdev_configure(struct rte_eth_dev *dev)
 	 * Fall back to default RSS key if the key is not specified
 	 */
 	if (dev->data->dev_conf.rxmode.mq_mode & ETH_MQ_RX_RSS) {
-		if (dev->data->dev_conf.rx_adv_conf.rss_conf.rss_key != NULL) {
-			internals->rss_key_len =
-				dev->data->dev_conf.rx_adv_conf.rss_conf.rss_key_len;
-			memcpy(internals->rss_key,
-			       dev->data->dev_conf.rx_adv_conf.rss_conf.rss_key,
+		struct rte_eth_rss_conf *rss_conf =
+			&dev->data->dev_conf.rx_adv_conf.rss_conf;
+		if (rss_conf->rss_key != NULL) {
+			if (internals->rss_key_len > rss_conf->rss_key_len) {
+				RTE_BOND_LOG(ERR, "Invalid rss key length(%u)",
+						rss_conf->rss_key_len);
+				return -EINVAL;
+			}
+
+			memcpy(internals->rss_key, rss_conf->rss_key,
 			       internals->rss_key_len);
 		} else {
-			internals->rss_key_len = sizeof(default_rss_key);
+			if (internals->rss_key_len > sizeof(default_rss_key)) {
+				RTE_BOND_LOG(ERR,
+				       "There is no suitable default hash key");
+				return -EINVAL;
+			}
+
 			memcpy(internals->rss_key, default_rss_key,
 			       internals->rss_key_len);
 		}
-- 
2.33.0

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-11-10 14:17:07.982241182 +0800
+++ 0136-net-bonding-fix-RSS-key-length.patch	2021-11-10 14:17:01.900745845 +0800
@@ -1 +1 @@
-From 6b1a001ec54635d63ed3f91eaef5164abee7a089 Mon Sep 17 00:00:00 2001
+From 709c5b655fe8e51cdca93ea063a58099c8996932 Mon Sep 17 00:00:00 2001
@@ -4,0 +5,3 @@
+Cc: Xueming Li <xuemingl at nvidia.com>
+
+[ upstream commit 6b1a001ec54635d63ed3f91eaef5164abee7a089 ]
@@ -26 +28,0 @@
-Cc: stable at dpdk.org
@@ -36 +38 @@
-index eb8d15d160..5140ef14c2 100644
+index 44775f61e5..c751a1242d 100644
@@ -60 +62 @@
-index 542c6633b5..4c604d6aec 100644
+index baa01b17e5..fb430be549 100644
@@ -63 +65 @@
-@@ -1701,14 +1701,11 @@ slave_configure(struct rte_eth_dev *bonded_eth_dev,
+@@ -1705,14 +1705,11 @@ slave_configure(struct rte_eth_dev *bonded_eth_dev,
@@ -81 +83 @@
-@@ -2251,6 +2248,7 @@ bond_ethdev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
+@@ -2244,6 +2241,7 @@ bond_ethdev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
@@ -89 +91 @@
-@@ -3044,13 +3042,15 @@ bond_ethdev_rss_hash_update(struct rte_eth_dev *dev,
+@@ -3033,13 +3031,15 @@ bond_ethdev_rss_hash_update(struct rte_eth_dev *dev,
@@ -110 +112 @@
-@@ -3510,14 +3510,24 @@ bond_ethdev_configure(struct rte_eth_dev *dev)
+@@ -3502,14 +3502,24 @@ bond_ethdev_configure(struct rte_eth_dev *dev)