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9a41e38a46
linux/drivers/infiniband/core
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willy@infradead.org 9a41e38a46 IB/mad: Use IDR for agent IDs 
Allocate agent IDs from a global IDR instead of an atomic variable.
This eliminates the possibility of reusing an ID which is already in
use after 4 billion registrations.  We limit the assigned ID to be less
than 2^24 as the mlx4 driver uses the most significant byte of the agent
ID to store the slave number.  Users unlucky enough to see a collision
between agent numbers and slave numbers see messages like:

 mlx4_ib: egress mad has non-null tid msb:1 class:4 slave:0

and the MAD layer stops working.

We look up the agent under protection of the RCU lock, which means we
have to free the agent using kfree_rcu, and only increment the reference
counter if it is not 0.

Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Reported-by: Hans Westgaard Ry <hans.westgaard.ry@oracle.com>
Acked-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Tested-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-06-18 11:22:54 -06:00
..
addr.c RDMA/rdma_cm: Delete rdma_addr_client 2018-04-17 19:42:50 -06:00
agent.c IB/core: Rename ib_destroy_ah to rdma_destroy_ah 2017-05-01 14:32:43 -04:00
agent.h
cache.c IB/core: Make rdma_find_gid_by_filter support all protocols 2018-06-18 11:09:05 -06:00
cgroup.c IB/core: added support to use rdma cgroup controller 2017-01-10 11:14:27 -05:00
cm_msgs.h
cm.c IB{cm, core}: Introduce and use ah_attr copy, move, replace APIs 2018-06-18 11:11:26 -06:00
cma_configfs.c IB/cma: use strlcpy() instead of strncpy() 2018-01-15 15:33:21 -07:00
cma_priv.h RDMA/cma: Move rdma_cm_state to cma_priv.h 2018-03-29 13:54:21 -06:00
cma.c IB: Replace ib_query_gid/ib_get_cached_gid with rdma_query_gid 2018-06-18 11:09:05 -06:00
core_priv.h RDMA/core: Remove indirection through ib_cache_setup() 2018-05-29 15:19:31 -06:00
cq.c RDMA/core: Reduce poll batch for direct cq polling 2018-03-06 20:08:39 -07:00
device.c IB: Replace ib_query_gid/ib_get_cached_gid with rdma_query_gid 2018-06-18 11:09:05 -06:00
fmr_pool.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
iwcm.c RDMA/netlink: Fix general protection fault 2017-12-07 15:28:07 -05:00
iwcm.h
iwpm_msg.c RDMA/iwpm: Properly mark end of NL messages 2017-09-29 11:32:42 -04:00
iwpm_util.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
iwpm_util.h
mad_priv.h IB/mad: Use IDR for agent IDs 2018-06-18 11:22:54 -06:00
mad_rmpp.c IB/mad: Change slid in RMPP recv from 16 to 32 bits 2017-08-08 14:47:18 -04:00
mad_rmpp.h
mad.c IB/mad: Use IDR for agent IDs 2018-06-18 11:22:54 -06:00
Makefile Verbs flow counters support 2018-06-04 08:48:11 -06:00
mr_pool.c
multicast.c treewide: Use struct_size() for kmalloc()-family 2018-06-06 11:15:43 -07:00
netlink.c RDMA/netlink: Simplify code of autoload modules 2018-01-02 13:36:57 -07:00
nldev.c RDMA/nldev: Return port capability flag for IB only 2018-06-18 11:09:05 -06:00
opa_smi.h
packer.c
rdma_core.c IB/uverbs: Tidy uverbs_uobject_add 2018-02-28 12:55:03 -07:00
rdma_core.h IB/core: Add new ioctl interface 2017-08-31 08:35:09 -04:00
restrack.c RDMA/restrack: Change SPDX tag to properly reflect license 2018-06-05 14:04:20 -06:00
roce_gid_mgmt.c IB/core: Remove duplicate declaration of gid_cache_wq 2018-05-24 09:39:25 -06:00
rw.c IB/core: remove redundant check on prot_sg_cnt 2017-10-10 10:49:45 -04:00
sa_query.c IB/cma: Resolve route only while receiving CM requests 2018-03-23 10:58:05 -06:00
sa.h
security.c IB/core: Use CONFIG_SECURITY_INFINIBAND to compile out security code 2018-05-01 11:16:36 -04:00
smi.c
smi.h
sysfs.c IB/core: Replace ib_query_gid with rdma_get_gid_attr 2018-06-18 11:09:05 -06:00
ucm.c RDMA: Use u64_to_user_ptr everywhere 2018-03-29 13:42:29 -06:00
ucma.c infiniband: fix a possible use-after-free bug 2018-06-04 09:37:03 -06:00
ud_header.c
umem_odp.c treewide: Use array_size() in vzalloc() 2018-06-12 16:19:22 -07:00
umem.c Merge branch 'mr_fix' into git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma for-next 2018-05-28 11:44:35 -06:00
user_mad.c vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
uverbs_cmd.c IB: Ensure that all rdma_ah_attr's are zero initialized 2018-06-18 11:11:26 -06:00
uverbs_ioctl_merge.c treewide: Use struct_size() for kmalloc()-family 2018-06-06 11:15:43 -07:00
uverbs_ioctl.c IB/uverbs: Fix validating mandatory attributes 2018-04-27 13:53:41 -04:00
uverbs_main.c RDMA/uverbs: Hoist the common process of disassociate_ucontext into ib core 2018-05-30 20:45:03 -04:00
uverbs_marshall.c IB/core: Convert OPA AH to IB for Extended LIDs only 2017-11-13 15:53:57 -05:00
uverbs_std_types_counters.c IB/uverbs: Add read counters support 2018-06-02 07:33:55 +03:00
uverbs_std_types_cq.c IB/uverbs: Add an ib_uobject getter to ioctl() infrastructure 2018-06-02 07:33:53 +03:00
uverbs_std_types_dm.c IB/uverbs: Add alloc/free dm uverbs ioctl support 2018-04-05 11:16:39 -06:00
uverbs_std_types_flow_action.c Verbs flow counters support 2018-06-04 08:48:11 -06:00
uverbs_std_types_mr.c IB/uverbs: Add device memory registration ioctl support 2018-04-05 11:16:39 -06:00
uverbs_std_types.c IB/uverbs: Add create/destroy counters support 2018-06-02 07:33:54 +03:00
uverbs.h IB/uverbs: Add support for flow counters 2018-06-02 07:33:56 +03:00
verbs.c RDMA: Hold the sgid_attr inside the struct ib_ah/qp 2018-06-18 11:11:27 -06:00