linux/include/rdma
Christoph Lameter 633d610212 RDMA/ipoib: Remove racy Subnet Manager sendonly join checks
When a system receives a REREG event from the SM, then the SM information
in the kernel is marked as invalid and a request is sent to the SM to
update the information. The SM information is invalid in that time period.

However, receiving a REREG also occurs simultaneously in user space
applications that are now trying to rejoin the multicast groups. Some of
those may be sendonly multicast groups which are then failing.

If the SM information is invalid then ib_sa_sendonly_fullmem_support()
returns false. That is wrong because it just means that we do not know yet
if the potentially new SM supports sendonly joins.

Sendonly join was introduced in 2015 and all the Subnet managers have
supported it ever since. So there is no point in checking if a subnet
manager supports it.

Should an old opensm get a request for a sendonly join then the request
will fail. The code that is removed here accomodated that situation and
fell back to a full join.

Falling back to a full join is problematic in itself. The reason to use
the sendonly join was to reduce the traffic on the Infiniband fabric
otherwise one could have just stayed with the regular join.  So this patch
may cause users of very old opensms to discover that lots of traffic
needlessly crosses their IB fabrics.

Link: https://lore.kernel.org/r/alpine.DEB.2.22.394.2101281845160.13303@www.lameter.com
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
2021-02-16 14:42:58 -04:00
..
ib_addr.h net: don't include ethtool.h from netdevice.h 2020-11-23 17:27:04 -08:00
ib_cache.h RDMA/core: Introduce new GID table query API 2020-10-01 21:20:11 -03:00
ib_cm.h RDMA/cm: Remove unused cm_class 2020-08-18 15:43:07 -03:00
ib_hdrs.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
ib_mad.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
ib_marshall.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
ib_pack.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
ib_pma.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
ib_sa.h RDMA/ipoib: Remove racy Subnet Manager sendonly join checks 2021-02-16 14:42:58 -04:00
ib_smi.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
ib_umem_odp.h IB/core: Enable ODP sync without faulting 2020-10-01 16:44:05 -03:00
ib_umem.h RDMA/umem: Support importing dma-buf as user memory region 2021-01-20 16:07:52 -04:00
ib_verbs.h RDMA/core: Introduce and use API to read port immutable data 2021-02-05 12:06:01 -04:00
ib.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
iba.h RDMA/cm: Add SET/GET implementations to hide IBA wire format 2020-01-25 15:05:59 -04:00
ibta_vol1_c12.h RDMA/cm: Add Enhanced Connection Establishment (ECE) bits 2020-05-27 16:05:05 -03:00
iw_cm.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
iw_portmap.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
lag.h RDMA/core: Add LAG functionality 2020-05-02 20:19:54 -03:00
mr_pool.h Linux 5.2-rc6 2019-06-28 21:18:23 -03:00
opa_addr.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
opa_port_info.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
opa_smi.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
opa_vnic.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
rdma_cm_ib.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
rdma_cm.h RDMA: Add rdma_connect_locked() 2020-10-28 09:14:49 -03:00
rdma_counter.h RDMA/nldev: Return an error message on failure to turn auto mode 2021-01-18 16:02:14 -04:00
rdma_netlink.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
rdma_vt.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
rdmavt_cq.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
rdmavt_mr.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
rdmavt_qp.h RDMA 5.9 merge window pull request 2020-08-06 16:43:36 -07:00
restrack.h RDMA/core: Allow drivers to disable restrack DB 2020-11-27 11:38:46 -04:00
rw.h Linux 5.2-rc6 2019-06-28 21:18:23 -03:00
signature.h RDMA: Make most headers compile stand alone 2019-07-25 13:58:47 -03:00
tid_rdma_defs.h IB/hfi1: Build TID RDMA WRITE request 2019-02-05 18:07:43 -05:00
uverbs_ioctl.h RDMA/uverbs: Fix incorrect variable type 2020-12-10 15:05:17 -04:00
uverbs_named_ioctl.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
uverbs_std_types.h RDMA/include: Replace license text with SPDX tags 2020-07-29 14:48:36 -03:00
uverbs_types.h RDMA/uverbs: Allow drivers to create a new HW object during rereg_mr 2020-12-07 14:06:23 -04:00