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RDMA/cma: Initialize the flow label of CM's route path record

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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".

Link: https://lore.kernel.org/r/20200504051935.269708-5-leon@kernel.org
Signed-off-by: Mark Zhang <markz@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Mark Zhang 2020-05-04 08:19:34 +03:00 committed by Jason Gunthorpe
parent 2b880b2e5e
commit f665340519
1 changed files with 23 additions and 0 deletions
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23
drivers/infiniband/core/cma.c
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@ -2909,6 +2909,24 @@ 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;
@ -2975,6 +2993,11 @@ 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);