[dpdk-dev] [PATCH] bonding: allow to create master bonding

[Tomasz Kulasek <tomaszx.kulasek@intel.com>]

This patch removes restrictions in bonded device library which prevent a
bonded device to be added to another bonded device.

There's two limitations to create master bonding:

 - Total depth of nesting is limited to two levels,
 - 802.3ad mode is not supported if one or more slaves is a bond device,


Signed-off-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>
---
 drivers/net/bonding/rte_eth_bond_api.c     | 63 ++++++++++++++++++++++++------
 drivers/net/bonding/rte_eth_bond_pmd.c     |  6 +++
 drivers/net/bonding/rte_eth_bond_private.h |  5 ++-
 3 files changed, 60 insertions(+), 14 deletions(-)

diff --git a/drivers/net/bonding/rte_eth_bond_api.c b/drivers/net/bonding/rte_eth_bond_api.c
index 36ec65d..05f565d 100644
--- a/drivers/net/bonding/rte_eth_bond_api.c
+++ b/drivers/net/bonding/rte_eth_bond_api.c
@@ -1,7 +1,7 @@
 /*-
  *   BSD LICENSE
  *
- *   Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
+ *   Copyright(c) 2010-2017 Intel Corporation. All rights reserved.
  *   All rights reserved.
  *
  *   Redistribution and use in source and binary forms, with or without
@@ -63,13 +63,45 @@
 }
 
 int
-valid_slave_port_id(uint8_t port_id)
+check_for_master_bonded_ethdev(const struct rte_eth_dev *eth_dev) {
+	int i;
+	struct bond_dev_private *internals;
+
+	if (check_for_bonded_ethdev(eth_dev) != 0)
+		return 0;
+
+	internals = eth_dev->data->dev_private;
+
+	/* Check if any of slave devices is a bonded device */
+	for (i = 0; i < internals->slave_count; i++)
+		if (valid_bonded_port_id(internals->slaves[i].port_id) == 0)
+			return 1;
+
+	return 0;
+}
+
+int
+valid_slave_port_id(uint8_t port_id, uint8_t mode)
 {
 	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -1);
 
 	/* Verify that port_id refers to a non bonded port */
-	if (check_for_bonded_ethdev(&rte_eth_devices[port_id]) == 0)
-		return -1;
+	if (check_for_bonded_ethdev(&rte_eth_devices[port_id]) == 0) {
+		if (mode == BONDING_MODE_8023AD) {
+			RTE_BOND_LOG(ERR, "One or more slaves is a bond device,"
+					" there 802.3ad mode can not be"
+					" supported on this bond device.");
+			return -1;
+		}
+
+		if (check_for_master_bonded_ethdev(&rte_eth_devices[port_id])) {
+			RTE_BOND_LOG(ERR, "Too many levels of bonding");
+			return -1;
+		}
+
+		/* Slave is in master bonding */
+		return 1;
+	}
 
 	return 0;
 }
@@ -250,14 +282,19 @@
 	struct bond_dev_private *internals;
 	struct rte_eth_link link_props;
 	struct rte_eth_dev_info dev_info;
-
-	if (valid_slave_port_id(slave_port_id) != 0)
-		return -1;
+	int status;
 
 	bonded_eth_dev = &rte_eth_devices[bonded_port_id];
 	internals = bonded_eth_dev->data->dev_private;
 
+	status = valid_slave_port_id(slave_port_id, internals->mode);
+
+	/* Slave is invalid */
+	if (status < 0)
+		return -1;
+
 	slave_eth_dev = &rte_eth_devices[slave_port_id];
+
 	if (slave_eth_dev->data->dev_flags & RTE_ETH_DEV_BONDED_SLAVE) {
 		RTE_BOND_LOG(ERR, "Slave device is already a slave of a bonded device");
 		return -1;
@@ -402,12 +439,12 @@
 	struct rte_eth_dev *slave_eth_dev;
 	int i, slave_idx;
 
-	if (valid_slave_port_id(slave_port_id) != 0)
-		return -1;
-
 	bonded_eth_dev = &rte_eth_devices[bonded_port_id];
 	internals = bonded_eth_dev->data->dev_private;
 
+	if (valid_slave_port_id(slave_port_id, internals->mode) < 0)
+		return -1;
+
 	/* first remove from active slave list */
 	slave_idx = find_slave_by_id(internals->active_slaves,
 		internals->active_slave_count, slave_port_id);
@@ -528,11 +565,11 @@
 	if (valid_bonded_port_id(bonded_port_id) != 0)
 		return -1;
 
-	if (valid_slave_port_id(slave_port_id) != 0)
-		return -1;
-
 	internals =  rte_eth_devices[bonded_port_id].data->dev_private;
 
+	if (valid_slave_port_id(slave_port_id, internals->mode) < 0)
+		return -1;
+
 	internals->user_defined_primary_port = 1;
 	internals->primary_port = slave_port_id;
 
diff --git a/drivers/net/bonding/rte_eth_bond_pmd.c b/drivers/net/bonding/rte_eth_bond_pmd.c
index 82959ab..d477f37 100644
--- a/drivers/net/bonding/rte_eth_bond_pmd.c
+++ b/drivers/net/bonding/rte_eth_bond_pmd.c
@@ -1292,6 +1292,12 @@ struct bwg_slave {
 		eth_dev->rx_pkt_burst = bond_ethdev_rx_burst;
 		break;
 	case BONDING_MODE_8023AD:
+		if (check_for_master_bonded_ethdev(eth_dev) == 1) {
+			RTE_BOND_LOG(ERR, "One or more slaves is a bond device,"
+					" there 802.3ad mode can not be"
+					" supported on this bond device.");
+			return -1;
+		}
 		if (bond_mode_8023ad_enable(eth_dev) != 0)
 			return -1;
 
diff --git a/drivers/net/bonding/rte_eth_bond_private.h b/drivers/net/bonding/rte_eth_bond_private.h
index c8db090..1a10564 100644
--- a/drivers/net/bonding/rte_eth_bond_private.h
+++ b/drivers/net/bonding/rte_eth_bond_private.h
@@ -184,6 +184,9 @@ struct bond_dev_private {
 int
 check_for_bonded_ethdev(const struct rte_eth_dev *eth_dev);
 
+int
+check_for_master_bonded_ethdev(const struct rte_eth_dev *eth_dev);
+
 /* Search given slave array to find possition of given id.
  * Return slave pos or slaves_count if not found. */
 static inline uint8_t
@@ -205,7 +208,7 @@ struct bond_dev_private {
 valid_bonded_port_id(uint8_t port_id);
 
 int
-valid_slave_port_id(uint8_t port_id);
+valid_slave_port_id(uint8_t port_id, uint8_t mode);
 
 void
 deactivate_slave(struct rte_eth_dev *eth_dev, uint8_t port_id);
-- 
1.9.1