On Thu, Aug 20, 2020 at 11:36:46PM +0800, Yi Zhang wrote: > parent sysfs reads will yield '\0' bytes when the interface name > has 15 chars, and there will no "\n" output. > > reproducer: > Create one interface with 15 chars > [root@test ~]# ip a s enp0s29u1u7u3c2 > 2: enp0s29u1u7u3c2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 1000 > link/ether 02:21:28:57:47:17 brd ff:ff:ff:ff:ff:ff > inet6 fe80::ac41:338f:5bcd:c222/64 scope link noprefixroute > valid_lft forever preferred_lft forever > [root@test ~]# modprobe rdma_rxe > [root@test ~]# echo enp0s29u1u7u3c2 > /sys/module/rdma_rxe/parameters/add > [root@test ~]# cat /sys/class/infiniband/rxe0/parent > enp0s29u1u7u3c2[root@test ~]# > [root@test ~]# f="/sys/class/infiniband/rxe0/parent" > [root@test ~]# echo "$(<"$f")" > -bash: warning: command substitution: ignored null byte in input > enp0s29u1u7u3c2 > > Suggested-by: Jason Gunthorpe <jgg@xxxxxxxxxx> > Signed-off-by: Yi Zhang <yi.zhang@xxxxxxxxxx> > Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx> > --- > drivers/infiniband/sw/rxe/rxe_verbs.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) Applied to for-rc with a Fixes and cc stable line Thanks, Jason
