From: Mark Zhang <markz@xxxxxxxxxxxx>
If flow label is not set by the user or it's not IPv4, initialize it with
the cma src/dst based on the "Kernighan and Ritchie's hash function".
Signed-off-by: Mark Zhang <markz@xxxxxxxxxxxx>
Reviewed-by: Maor Gottlieb <maorg@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
drivers/infiniband/core/cma.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 26e6f7df247b..bc66a0d39068 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -2904,6 +2904,24 @@ static int iboe_tos_to_sl(struct net_device *ndev, int tos)
return 0;
}
+static __be32 cma_get_roce_udp_flow_label(struct rdma_id_private *id_priv)
+{
+ struct sockaddr_in6 *addr6;
+ u16 dport, sport;
+ u32 hash, fl;
+
+ addr6 = (struct sockaddr_in6 *)cma_src_addr(id_priv);
+ fl = be32_to_cpu(addr6->sin6_flowinfo) & IB_GRH_FLOWLABEL_MASK;
+ if ((cma_family(id_priv) != AF_INET6) || !fl) {
+ dport = be16_to_cpu(cma_port(cma_dst_addr(id_priv)));
+ sport = be16_to_cpu(cma_port(cma_src_addr(id_priv)));
+ hash = (u32)sport * 31 + dport;
+ fl = hash & IB_GRH_FLOWLABEL_MASK;
+ }
+
+ return cpu_to_be32(fl);
+}
+
static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
{
struct rdma_route *route = &id_priv->id.route;
@@ -2970,6 +2988,11 @@ static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
goto err2;
}
+ if (rdma_protocol_roce_udp_encap(id_priv->id.device,
+ id_priv->id.port_num))
+ route->path_rec->flow_label =
+ cma_get_roce_udp_flow_label(id_priv);
+
cma_init_resolve_route_work(work, id_priv);
queue_work(cma_wq, &work->work);
--
2.25.2
