From: Parav Pandit <parav@mellanox.com>
Date: Tue, 15 Oct 2019 10:20:58 +0300
Subject: IB/cma: Honor traffic class from lower netdevice for RoCE
Patch-mainline: v5.5-rc1
Git-commit: d3bd93967015d974bb95d47cc14edd5adbea814f
References: jsc#SLE-8449
When a macvlan netdevice is used for RoCE, consider the tos->prio->tc
mapping as SL using its lower netdevice.
1. If the lower netdevice is a VLAN netdevice, consider the VLAN netdevice
and it's parent netdevice for mapping
2. If the lower netdevice is not a VLAN netdevice, consider tc mapping
directly from the lower netdevice
Link: https://lore.kernel.org/r/20191015072058.17347-1-leon@kernel.org
Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/infiniband/core/cma.c | 61 +++++++++++++++++++++++++++++++++++-------
1 file changed, 52 insertions(+), 9 deletions(-)
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -2828,22 +2828,65 @@ static int cma_resolve_iw_route(struct r
return 0;
}
-static int iboe_tos_to_sl(struct net_device *ndev, int tos)
+static int get_vlan_ndev_tc(struct net_device *vlan_ndev, int prio)
{
- int prio;
struct net_device *dev;
- prio = rt_tos2priority(tos);
- dev = is_vlan_dev(ndev) ? vlan_dev_real_dev(ndev) : ndev;
+ dev = vlan_dev_real_dev(vlan_ndev);
if (dev->num_tc)
return netdev_get_prio_tc_map(dev, prio);
-#if IS_ENABLED(CONFIG_VLAN_8021Q)
+ return (vlan_dev_get_egress_qos_mask(vlan_ndev, prio) &
+ VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
+}
+
+struct iboe_prio_tc_map {
+ int input_prio;
+ int output_tc;
+ bool found;
+};
+
+static int get_lower_vlan_dev_tc(struct net_device *dev, void *data)
+{
+ struct iboe_prio_tc_map *map = data;
+
+ if (is_vlan_dev(dev))
+ map->output_tc = get_vlan_ndev_tc(dev, map->input_prio);
+ else if (dev->num_tc)
+ map->output_tc = netdev_get_prio_tc_map(dev, map->input_prio);
+ else
+ map->output_tc = 0;
+ /* We are interested only in first level VLAN device, so always
+ * return 1 to stop iterating over next level devices.
+ */
+ map->found = true;
+ return 1;
+}
+
+static int iboe_tos_to_sl(struct net_device *ndev, int tos)
+{
+ struct iboe_prio_tc_map prio_tc_map = {};
+ int prio = rt_tos2priority(tos);
+
+ /* If VLAN device, get it directly from the VLAN netdev */
if (is_vlan_dev(ndev))
- return (vlan_dev_get_egress_qos_mask(ndev, prio) &
- VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
-#endif
- return 0;
+ return get_vlan_ndev_tc(ndev, prio);
+
+ prio_tc_map.input_prio = prio;
+ rcu_read_lock();
+ netdev_walk_all_lower_dev_rcu(ndev,
+ get_lower_vlan_dev_tc,
+ &prio_tc_map);
+ rcu_read_unlock();
+ /* If map is found from lower device, use it; Otherwise
+ * continue with the current netdevice to get priority to tc map.
+ */
+ if (prio_tc_map.found)
+ return prio_tc_map.output_tc;
+ else if (ndev->num_tc)
+ return netdev_get_prio_tc_map(ndev, prio);
+ else
+ return 0;
}
static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)