When multiple async FDs were allowed to exist the idea was for all
broadcast events to be delivered to all async FDs, however
IB_EVENT_DEVICE_FATAL was missed.
Instead of having ib_uverbs_free_hw_resources() special case the global
async_fd, have it cause the event during the uobject destruction. Every
async fd is now a uobject so simply generate the IB_EVENT_DEVICE_FATAL
while destroying the async fd uobject. This ensures every async FD gets a
copy of the event.
Fixes: d680e88e20 ("RDMA/core: Add UVERBS_METHOD_ASYNC_EVENT_ALLOC")
Link: https://lore.kernel.org/r/20200507063348.98713-3-leon@kernel.org
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The commit below moved all of the destruction to the disassociate step and
cleaned up the event channel during destroy_uobj.
However, when ib_uverbs_free_hw_resources() pushes IB_EVENT_DEVICE_FATAL
and then immediately goes to destroy all uobjects this causes
ib_uverbs_free_event_queue() to discard the queued event if userspace
hasn't already read() it.
Unlike all other event queues async FD needs to defer the
ib_uverbs_free_event_queue() until FD release. This still unregisters the
handler from the IB device during disassociation.
Fixes: 3e032c0e92 ("RDMA/core: Make ib_uverbs_async_event_file into a uobject")
Link: https://lore.kernel.org/r/20200507063348.98713-2-leon@kernel.org
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Do not decrease the reference count of resource tracker object twice in
the error flow of res_get_common_doit.
Fixes: c5dfe0ea6f ("RDMA/nldev: Add resource tracker doit callback")
Link: https://lore.kernel.org/r/20200507062942.98305-1-leon@kernel.org
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The IB core pkey cache is populated by procedure ib_cache_update().
Initially, the pkey cache pointer is NULL. ib_cache_update allocates a
buffer and populates it with the device's pkeys, via repeated calls to
procedure ib_query_pkey().
If there is a failure in populating the pkey buffer via ib_query_pkey(),
ib_cache_update does not replace the old pkey buffer cache with the
updated one -- it leaves the old cache as is.
Since initially the pkey buffer cache is NULL, when calling
ib_cache_update the first time, a failure in ib_query_pkey() will cause
the pkey buffer cache pointer to remain NULL.
In this situation, any calls subsequent to ib_get_cached_pkey(),
ib_find_cached_pkey(), or ib_find_cached_pkey_exact() will try to
dereference the NULL pkey cache pointer, causing a kernel panic.
Fix this by checking the ib_cache_update() return value.
Fixes: 8faea9fd4a ("RDMA/cache: Move the cache per-port data into the main ib_port_data")
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Link: https://lore.kernel.org/r/20200507071012.100594-1-leon@kernel.org
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The call to ->lookup_put() was too early and it caused an unlock of the
read/write protection of the uobject after the FD was put. This allows a
race:
CPU1 CPU2
rdma_lookup_put_uobject()
lookup_put_fd_uobject()
fput()
fput()
uverbs_uobject_fd_release()
WARN_ON(uverbs_try_lock_object(uobj,
UVERBS_LOOKUP_WRITE));
atomic_dec(usecnt)
Fix the code by changing the order, first unlock and call to
->lookup_put() after that.
Fixes: 3832125624 ("IB/core: Add support for idr types")
Link: https://lore.kernel.org/r/20200423060122.6182-1-leon@kernel.org
Suggested-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The xa_alloc_cyclic_irq() function returns either 0 or 1 on success and
negatives on error. This code treats 1 as an error and returns ERR_PTR(1)
which will cause an Oops in the caller.
Fixes: ae78ff3a0f ("RDMA/cm: Convert local_id_table to XArray")
Link: https://lore.kernel.org/r/20200407093714.GA80285@mwanda
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The cm_reset_to_idle() call before formatting event changed the CM_ID
state from IB_CM_REQ_RCVD to be IB_CM_IDLE. It caused to wrong value of
CM_REJ_MESSAGE_REJECTED field.
The result of that was that rdma_reject() calls in the passive side didn't
generate RDMA_CM_EVENT_REJECTED event in the active side.
Fixes: 81ddb41f87 ("RDMA/cm: Allow ib_send_cm_rej() to be done under lock")
Link: https://lore.kernel.org/r/20200406173242.1465911-1-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The majority of the patches are cleanups, refactorings and clarity
improvements
- Various driver updates for siw, bnxt_re, rxe, efa, mlx5, hfi1
- Lots of cleanup patches for hns
- Convert more places to use refcount
- Aggressively lock the RDMA CM code that syzkaller says isn't working
- Work to clarify ib_cm
- Use the new ib_device lifecycle model in bnxt_re
- Fix mlx5's MR cache which seems to be failing more often with the new
ODP code
- mlx5 'dynamic uar' and 'tx steering' user interfaces
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
Pull rdma updates from Jason Gunthorpe:
"The majority of the patches are cleanups, refactorings and clarity
improvements.
This cycle saw some more activity from Syzkaller, I think we are now
clean on all but one of those bugs, including the long standing and
obnoxious rdma_cm locking design defect. Continue to see many drivers
getting cleanups, with a few new user visible features.
Summary:
- Various driver updates for siw, bnxt_re, rxe, efa, mlx5, hfi1
- Lots of cleanup patches for hns
- Convert more places to use refcount
- Aggressively lock the RDMA CM code that syzkaller says isn't
working
- Work to clarify ib_cm
- Use the new ib_device lifecycle model in bnxt_re
- Fix mlx5's MR cache which seems to be failing more often with the
new ODP code
- mlx5 'dynamic uar' and 'tx steering' user interfaces"
* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma: (144 commits)
RDMA/bnxt_re: make bnxt_re_ib_init static
IB/qib: Delete struct qib_ivdev.qp_rnd
RDMA/hns: Fix uninitialized variable bug
RDMA/hns: Modify the mask of QP number for CQE of hip08
RDMA/hns: Reduce the maximum number of extend SGE per WQE
RDMA/hns: Reduce PFC frames in congestion scenarios
RDMA/mlx5: Add support for RDMA TX flow table
net/mlx5: Add support for RDMA TX steering
IB/hfi1: Call kobject_put() when kobject_init_and_add() fails
IB/hfi1: Fix memory leaks in sysfs registration and unregistration
IB/mlx5: Move to fully dynamic UAR mode once user space supports it
IB/mlx5: Limit the scope of struct mlx5_bfreg_info to mlx5_ib
IB/mlx5: Extend QP creation to get uar page index from user space
IB/mlx5: Extend CQ creation to get uar page index from user space
IB/mlx5: Expose UAR object and its alloc/destroy commands
IB/hfi1: Get rid of a warning
RDMA/hns: Remove redundant judgment of qp_type
RDMA/hns: Remove redundant assignment of wc->smac when polling cq
RDMA/hns: Remove redundant qpc setup operations
RDMA/hns: Remove meaningless prints
...
The following modify sequence (loosely based on ipoib) will lose a pkey
modifcation:
- Modify (pkey index, port)
- Modify (new pkey index, NO port)
After the first modify, the qp_pps list will have saved the pkey and the
unit on the main list.
During the second modify, get_new_pps() will fetch the port from qp_pps
and read the new pkey index from qp_attr->pkey_index. The state will
still be zero, or IB_PORT_PKEY_NOT_VALID. Because of the invalid state,
the new values will never replace the one in the qp pps list, losing the
new pkey.
This happens because the following if statements will never correct the
state because the first term will be false. If the code had been executed,
it would incorrectly overwrite valid values.
if ((qp_attr_mask & IB_QP_PKEY_INDEX) && (qp_attr_mask & IB_QP_PORT))
new_pps->main.state = IB_PORT_PKEY_VALID;
if (!(qp_attr_mask & (IB_QP_PKEY_INDEX | IB_QP_PORT)) && qp_pps) {
new_pps->main.port_num = qp_pps->main.port_num;
new_pps->main.pkey_index = qp_pps->main.pkey_index;
if (qp_pps->main.state != IB_PORT_PKEY_NOT_VALID)
new_pps->main.state = IB_PORT_PKEY_VALID;
}
Fix by joining the two if statements with an or test to see if qp_pps is
non-NULL and in the correct state.
Fixes: 1dd017882e ("RDMA/core: Fix protection fault in get_pkey_idx_qp_list")
Link: https://lore.kernel.org/r/20200313124704.14982.55907.stgit@awfm-01.aw.intel.com
Reviewed-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The first switch statement in cm_destroy_id() tries to move the ID to
either IB_CM_IDLE or IB_CM_TIMEWAIT. Both states will block concurrent
MAD handlers from progressing.
Previous patches removed the unreliably lock/unlock sequences in this
flow, this patch removes the extra locking steps and adds the missing
parts to guarantee that destroy reaches IB_CM_IDLE. There is no point in
leaving the ID in the IB_CM_TIMEWAIT state the memory about to be kfreed.
Rework things to hold the lock across all the state transitions and
directly assert when done that it ended up in IB_CM_IDLE as expected.
This was accompanied by a careful audit of all the state transitions here,
which generally did end up in IDLE on their success and non-racy paths.
Link: https://lore.kernel.org/r/20200310092545.251365-16-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The first thing ib_send_cm_sidr_rep() does is obtain the lock, so use the
usual unlocked wrapper, locked actor pattern here.
Get rid of the cm_reject_sidr_req() wrapper so each call site can call the
locked or unlocked version as required.
This avoids a sketchy lock/unlock sequence (which could allow state to
change) during cm_destroy_id().
Link: https://lore.kernel.org/r/20200310092545.251365-15-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The first thing ib_send_cm_rej() does is obtain the lock, so use the usual
unlocked wrapper, locked actor pattern here.
This avoids a sketchy lock/unlock sequence (which could allow state to
change) during cm_destroy_id().
While here simplify some of the logic in the implementation.
Link: https://lore.kernel.org/r/20200310092545.251365-14-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The first thing ib_send_cm_drep() does is obtain the lock, so use the
usual unlocked wrapper, locked actor pattern here.
This avoids a sketchy lock/unlock sequence (which could allow state to
change) during cm_destroy_id().
Link: https://lore.kernel.org/r/20200310092545.251365-13-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The first thing ib_send_cm_dreq() does is obtain the lock, so use the
usual unlocked wrapper, locked actor pattern here.
This avoids a sketchy lock/unlock sequence (which could allow state to
change) during cm_destroy_id().
Link: https://lore.kernel.org/r/20200310092545.251365-12-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
These functions all touch state, so must be called under the lock.
Inspection shows this is currently true.
Link: https://lore.kernel.org/r/20200310092545.251365-11-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
ib_crate_cm_id() immediately places the id in the xarray, and publishes it
into the remote_id and remote_qpn rbtrees. This makes it visible to other
threads before it is fully set up.
It appears the thinking here was that the states IB_CM_IDLE and
IB_CM_REQ_RCVD do not allow any MAD handler or lookup in the remote_id and
remote_qpn rbtrees to advance.
However, cm_rej_handler() does take an action on IB_CM_REQ_RCVD, which is
not really expected by the design.
Make the whole thing clearer:
- Keep the new cm_id out of the xarray until it is completely set up.
This directly prevents MAD handlers and all rbtree lookups from seeing
the pointer.
- Move all the trivial setup right to the top so it is obviously done
before any concurrency begins
- Move the mutation of the cm_id_priv out of cm_match_id() and into the
caller so the state transition is obvious
- Place the manipulation of the work_list at the end, under lock, after
the cm_id is placed in the xarray. The work_count cannot change on an
ID outside the xarray.
- Add some comments
Link: https://lore.kernel.org/r/20200310092545.251365-9-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
ib_create_cm_id() immediately places the id in the xarray, so it is visible
to network traffic.
The state is initially set to IB_CM_IDLE and all the MAD handlers will
test this state under lock and refuse to advance from IDLE, so adding to
the xarray is harmless.
Further, the set to IB_CM_SIDR_REQ_RCVD also excludes all MAD handlers.
However, the local_id isn't even used for SIDR mode, and there will be no
input MADs related to the newly created ID.
So, make the whole flow simpler so it can be understood:
- Do not put the SIDR cm_id in the xarray. This directly shows that there
is no concurrency
- Delete the confusing work_count and pending_list manipulations. This
mechanism is only used by MAD handlers and timewait, neither of which
apply to SIDR.
- Add a few comments and rename 'cur_cm_id_priv' to 'listen_cm_id_priv'
- Move other loose sets up to immediately after cm_id creation so that
the cm_id is fully configured right away. This fixes an oversight where
the service_id will not be returned back on a IB_SIDR_UNSUPPORTED
reject.
Link: https://lore.kernel.org/r/20200310092545.251365-8-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The lock should not be dropped before doing the pr_debug() print as it is
accessing data protected by the lock, such as id.state.
Fixes: 119bf81793 ("IB/cm: Add debug prints to ib_cm")
Link: https://lore.kernel.org/r/20200310092545.251365-7-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Any manipulation of cm_id->state must be done under the cm_id_priv->lock,
the two routines that added listens did not follow this rule, because they
never participate in any concurrent access around the state.
However, since this exception makes the code hard to understand, simplify
the flow so that it can be fully locked:
- Move manipulation of listen_sharecount into cm_insert_listen() so it is
trivially under the cm.lock without having to expose the cm.lock to the
caller.
- Push the cm.lock down into cm_insert_listen() and have the function
increment the reference count before returning an existing pointer.
- Split ib_cm_listen() into an cm_init_listen() and do not call
ib_cm_listen() from ib_cm_insert_listen()
- Make both ib_cm_listen() and ib_cm_insert_listen() directly call
cm_insert_listen() under their cm_id_priv->lock which does both a
collision detect and, if needed, the insert (atomically)
- Enclose all state manipulation within the cm_id_priv->lock, notice this
set can be done safely after cm_insert_listen() as no reader is allowed
to read the state without holding the lock.
- Do not set the listen cm_id in the xarray, as it is never correct to
look it up. This makes the concurrency simpler to understand.
Many needless error unwinds are removed in the process.
Link: https://lore.kernel.org/r/20200310092545.251365-6-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Too much of the destruction is very carefully sensitive to the state
and various other things. Move more code to the unconditional path and
add several WARN_ONs to check consistency.
Link: https://lore.kernel.org/r/20200310092545.251365-5-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
When creating a cm_id during REQ the id immediately becomes visible to the
other MAD handlers, and shortly after the state is moved to IB_CM_REQ_RCVD
This allows cm_rej_handler() to run concurrently and free the work:
CPU 0 CPU1
cm_req_handler()
ib_create_cm_id()
cm_match_req()
id_priv->state = IB_CM_REQ_RCVD
cm_rej_handler()
cm_acquire_id()
spin_lock(&id_priv->lock)
switch (id_priv->state)
case IB_CM_REQ_RCVD:
cm_reset_to_idle()
kfree(id_priv->timewait_info);
goto destroy
destroy:
kfree(id_priv->timewait_info);
id_priv->timewait_info = NULL
Causing a double free or worse.
Do not free the timewait_info without also holding the
id_priv->lock. Simplify this entire flow by making the free unconditional
during cm_destroy_id() and removing the confusing special case error
unwind during creation of the timewait_info.
This also fixes a leak of the timewait if cm_destroy_id() is called in
IB_CM_ESTABLISHED with an XRC TGT QP. The state machine will be left in
ESTABLISHED while it needed to transition through IB_CM_TIMEWAIT to
release the timewait pointer.
Also fix a leak of the timewait_info if the caller mis-uses the API and
does ib_send_cm_reqs().
Fixes: a977049dac ("[PATCH] IB: Add the kernel CM implementation")
Link: https://lore.kernel.org/r/20200310092545.251365-4-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The test here typod the cm_id_priv to use, it used the one that was
freshly allocated. By definition the allocated one has the matching
cm_handler and zero context, so the condition was always true.
Instead check that the existing listening ID is compatible with the
proposed handler so that it can be shared, as was originally intended.
Fixes: 067b171b86 ("IB/cm: Share listening CM IDs")
Link: https://lore.kernel.org/r/20200310092545.251365-3-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
xa_alloc_cyclic() is a SMP release to be paired with some later acquire
during xa_load() as part of cm_acquire_id().
As such, xa_alloc_cyclic() must be done after the cm_id is fully
initialized, in particular, it absolutely must be after the
refcount_set(), otherwise the refcount_inc() in cm_acquire_id() may not
see the set.
As there are several cases where a reader will be able to use the
id.local_id after cm_acquire_id in the IB_CM_IDLE state there needs to be
an unfortunate split into a NULL allocate and a finalizing xa_store.
Fixes: a977049dac ("[PATCH] IB: Add the kernel CM implementation")
Link: https://lore.kernel.org/r/20200310092545.251365-2-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Peer to peer support was never implemented, so delete it to make code less
clutter.
Link: https://lore.kernel.org/r/20200310091438.248429-6-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Mark Zhang <markz@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The header file rdma_core.h is duplicate, so let's remove it.
Fixes: 622db5b643 ("RDMA/core: Add trace points to follow MR allocation")
Link: https://lore.kernel.org/r/20200310091656.249696-1-leon@kernel.org
Signed-off-by: Zhu Yanjun <yanjunz@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The tgid used to be part of ib_umem_free_notifier(), when it was reworked
it got moved to release, but it should have been unconditional as all umem
alloc paths get the tgid.
As is, creating an implicit ODP will leak the tgid reference.
Link: https://lore.kernel.org/r/20200304181607.GA22412@ziepe.ca
Cc: stable@kernel.org
Fixes: f25a546e65 ("RDMA/odp: Use mmu_interval_notifier_insert()")
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Since RDMA rw API support operations with P2P memory sg list, make sure to
map/unmap the scatter list for signature operation correctly.
Link: https://lore.kernel.org/r/20200220100819.41860-2-maxg@mellanox.com
Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
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Merge tag 'v5.6-rc5' into rdma.git for-next
Required due to dependencies in following patches.
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The dealloc_work_entries() function must update the work_free_list pointer
while freeing its entries, since potentially called again on same list. A
second iteration of the work list caused system crash. This happens, if
work allocation fails during cma_iw_listen() and free_cm_id() tries to
free the list again during cleanup.
Fixes: 922a8e9fb2 ("RDMA: iWARP Connection Manager.")
Link: https://lore.kernel.org/r/20200302181614.17042-1-bmt@zurich.ibm.com
Reported-by: syzbot+cb0c054eabfba4342146@syzkaller.appspotmail.com
Signed-off-by: Bernard Metzler <bmt@zurich.ibm.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Registration of a mmu_notifier requires the caller to hold a mmget() on
the mm as registration is not permitted to race with exit_mmap(). There is
a BUG_ON inside the mmu_notifier to guard against this.
Normally creating a umem is done against current which implicitly holds
the mmget(), however an implicit ODP child is created from a pagefault
work queue and is not guaranteed to have a mmget().
Call mmget() around this registration and abort faulting if the MM has
gone to exit_mmap().
Before the patch below the notifier was registered when the implicit ODP
parent was created, so there was no chance to register a notifier outside
of current.
Fixes: c571feca2d ("RDMA/odp: use mmu_notifier_get/put for 'struct ib_ucontext_per_mm'")
Link: https://lore.kernel.org/r/20200227114118.94736-1-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
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Merge tag 'v5.6-rc4' into rdma.git for-next
Required due to dependencies in following patches.
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The algorithm pre-allocates a cm_id since allocation cannot be done while
holding the cm.lock spinlock, however it doesn't free it on one error
path, leading to a memory leak.
Fixes: 067b171b86 ("IB/cm: Share listening CM IDs")
Link: https://lore.kernel.org/r/20200221152023.GA8680@ziepe.ca
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")
Link: https://lore.kernel.org/r/20200213010425.GA13068@embeddedor.com
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> # added a few more
In case the SGL was mapped for P2P DMA operation, we must unmap it using
pci_p2pdma_unmap_sg during the error unwind of rdma_rw_ctx_init()
Fixes: 7f73eac3a7 ("PCI/P2PDMA: Introduce pci_p2pdma_unmap_sg()")
Link: https://lore.kernel.org/r/20200220100819.41860-1-maxg@mellanox.com
Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Clang warns:
../drivers/infiniband/core/security.c:351:41: warning: converting the
enum constant to a boolean [-Wint-in-bool-context]
if (!(qp_attr_mask & (IB_QP_PKEY_INDEX || IB_QP_PORT)) && qp_pps) {
^
1 warning generated.
A bitwise OR should have been used instead.
Fixes: 1dd017882e ("RDMA/core: Fix protection fault in get_pkey_idx_qp_list")
Link: https://lore.kernel.org/r/20200217204318.13609-1-natechancellor@gmail.com
Link: https://github.com/ClangBuiltLinux/linux/issues/889
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
