From: Parav Pandit parav@mellanox.com
[ Upstream commit 5d7ed2f27bbd482fd29e6b2e204b1a1ee8a0b268 ]
When two netdev have same link local addresses (such as vlan and non vlan), two rdma cm listen id should be able to bind to following different addresses.
listener-1: addr=lla, scope_id=A, port=X listener-2: addr=lla, scope_id=B, port=X
However while comparing the addresses only addr and port are considered, due to which 2nd listener fails to listen.
In below example of two listeners, 2nd listener is failing with address in use error.
$ rping -sv -a fe80::268a:7ff:feb3:d113%ens2f1 -p 4545&
$ rping -sv -a fe80::268a:7ff:feb3:d113%ens2f1.200 -p 4545 rdma_bind_addr: Address already in use
To overcome this, consider the scope_ids as well which forms the accurate IPv6 link local address.
Signed-off-by: Parav Pandit parav@mellanox.com Reviewed-by: Daniel Jurgens danielj@mellanox.com Signed-off-by: Leon Romanovsky leonro@mellanox.com Signed-off-by: Jason Gunthorpe jgg@mellanox.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/core/cma.c | 25 +++++++++++++++++++------ 1 file changed, 19 insertions(+), 6 deletions(-)
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c index 1454290078def..76e7eca35a110 100644 --- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -902,18 +902,31 @@ static inline int cma_any_addr(struct sockaddr *addr) return cma_zero_addr(addr) || cma_loopback_addr(addr); }
-static int cma_addr_cmp(struct sockaddr *src, struct sockaddr *dst) +static int cma_addr_cmp(const struct sockaddr *src, const struct sockaddr *dst) { if (src->sa_family != dst->sa_family) return -1;
switch (src->sa_family) { case AF_INET: - return ((struct sockaddr_in *) src)->sin_addr.s_addr != - ((struct sockaddr_in *) dst)->sin_addr.s_addr; - case AF_INET6: - return ipv6_addr_cmp(&((struct sockaddr_in6 *) src)->sin6_addr, - &((struct sockaddr_in6 *) dst)->sin6_addr); + return ((struct sockaddr_in *)src)->sin_addr.s_addr != + ((struct sockaddr_in *)dst)->sin_addr.s_addr; + case AF_INET6: { + struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *)src; + struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *)dst; + bool link_local; + + if (ipv6_addr_cmp(&src_addr6->sin6_addr, + &dst_addr6->sin6_addr)) + return 1; + link_local = ipv6_addr_type(&dst_addr6->sin6_addr) & + IPV6_ADDR_LINKLOCAL; + /* Link local must match their scope_ids */ + return link_local ? (src_addr6->sin6_scope_id != + dst_addr6->sin6_scope_id) : + 0; + } + default: return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr, &((struct sockaddr_ib *) dst)->sib_addr);