no_llseek had been defined to NULL two years ago, in commit 868941b144
("fs: remove no_llseek")
To quote that commit,
At -rc1 we'll need do a mechanical removal of no_llseek -
git grep -l -w no_llseek | grep -v porting.rst | while read i; do
sed -i '/\<no_llseek\>/d' $i
done
would do it.
Unfortunately, that hadn't been done. Linus, could you do that now, so
that we could finally put that thing to rest? All instances are of the
form
.llseek = no_llseek,
so it's obviously safe.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The lookup_atid() function can return NULL if the ATID is
invalid or does not exist in the identifier table, which
could lead to dereferencing a null pointer without a
check in the `act_establish()` and `act_open_rpl()` functions.
Add a NULL check to prevent null pointer dereferencing.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: cfdda9d764 ("RDMA/cxgb4: Add driver for Chelsio T4 RNIC")
Signed-off-by: Mikhail Lobanov <m.lobanov@rosalinux.ru>
Link: https://patch.msgid.link/20240912145844.77516-1-m.lobanov@rosalinux.ru
Signed-off-by: Leon Romanovsky <leon@kernel.org>
The IB layer provides a common interface to store and get net
devices associated to an IB device port (ib_device_set_netdev()
and ib_device_get_netdev()).
Previously, mlx5_ib stored and managed the associated net devices
internally.
Replace internal net device management in mlx5_ib with
ib_device_set_netdev() when attaching/detaching a net device and
ib_device_get_netdev() when retrieving the net device.
Export ib_device_get_netdev().
For mlx5 representors/PFs/VFs and lag creation we replace the netdev
assignments with the IB set/get netdev functions.
In active-backup mode lag the active slave net device is stored in the
lag itself. To assure the net device stored in a lag bond IB device is
the active slave we implement the following:
- mlx5_core: when modifying the slave of a bond we send the internal driver event
MLX5_DRIVER_EVENT_ACTIVE_BACKUP_LAG_CHANGE_LOWERSTATE.
- mlx5_ib: when catching the event call ib_device_set_netdev()
This patch also ensures the correct IB events are sent in switchdev lag.
While at it, when in multiport eswitch mode, only a single IB device is
created for all ports. The said IB device will receive all netdev events
of its VFs once loaded, thus to avoid overwriting the mapping of PF IB
device to PF netdev, ignore NETDEV_REGISTER events if the ib device has
already been mapped to a netdev.
Signed-off-by: Chiara Meiohas <cmeiohas@nvidia.com>
Signed-off-by: Michael Guralnik <michaelgur@nvidia.com>
Link: https://patch.msgid.link/20240909173025.30422-6-michaelgur@nvidia.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
phys_port_cnt of the IB device must be initialized before calling
ib_device_set_netdev().
Previously, phys_port_cnt was initialized in the mlx5_ib init function.
Remove this initialization to allow setting it separately, providing
the flexibility to call ib_device_set_netdev before registering the
IB device.
Signed-off-by: Chiara Meiohas <cmeiohas@nvidia.com>
Signed-off-by: Michael Guralnik <michaelgur@nvidia.com>
Link: https://patch.msgid.link/20240909173025.30422-4-michaelgur@nvidia.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
The memory scheme page fault event is a new approch in handling page fault
on mkeys using the on-demand-paging feature.
The major shift in handling the page fault in this scheme is that the HW
is taking responsibilty for parsing the faulted mkey instead of the
previous approach where the driver would read and parse the wqes and
query the mkeys to get to the direct mkey that we need to handle.
Therefore, the event we get from FW in this scheme will contain the
direct mkey and address we need to handle and require much less work
from driver.
Additionally, to optimize performance, the FW can generate the event on
a memory area that is larger than the faulted memory operation is
requiring, to 'prefetch' memory that is around it and will likely be
used soon.
Unlike previous types of page fault, the memory page scheme fault does
not always require a resume command after handling the page fault as the FW
can post multiple events on same mkey and will set the 'last' flag only on
the page fault that requires the resume command.
Signed-off-by: Michael Guralnik <michaelgur@nvidia.com>
Link: https://patch.msgid.link/20240909100504.29797-7-michaelgur@nvidia.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
The new memory scheme page faults are requesting the driver to fetch
additinal pages to the faulted memory access.
This is done in order to prefetch pages before and after the area that
got the page fault, assuming this will reduce the total amount of page
faults.
The driver should ensure it handles only the pages that are within the
umem range.
Signed-off-by: Michael Guralnik <michaelgur@nvidia.com>
Link: https://patch.msgid.link/20240909100504.29797-5-michaelgur@nvidia.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
When allocating MTT hem, for each hop level of each hem that is being
allocated, the driver iterates the hem list to find out whether the
bt page has been allocated in this hop level. If not, allocate a new
one and splice it to the list. The time complexity is O(n^2) in worst
cases.
Currently the allocation for-loop uses 'unit' as the step size. This
actually has taken into account the reuse of last-hop-level MTT bt
pages by multiple buffer pages. Thus pages of last hop level will
never have been allocated, so there is no need to iterate the hem list
in last hop level.
Removing this unnecessary iteration can reduce the time complexity to
O(n).
Fixes: 38389eaa4d ("RDMA/hns: Add mtr support for mixed multihop addressing")
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
Link: https://patch.msgid.link/20240906093444.3571619-9-huangjunxian6@hisilicon.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
When variable size WQE is supported, max_qp_sges reported
is more than 6. For devices that supports variable size WQE,
the Send WQE size calculation is wrong when an an older library
that doesn't support variable size WQE is used.
Set the WQE size to 128 when static WQE is supported.
Fixes: de1d364c38 ("RDMA/bnxt_re: Add support for Variable WQE in Genp7 adapters")
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://patch.msgid.link/1725444253-13221-3-git-send-email-selvin.xavier@broadcom.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Fix the cleanup of the temp cache entries that are dynamically created
in the MR cache.
The cleanup of the temp cache entries is currently scheduled only when a
new entry is created. Since in the cleanup of the entries only the mkeys
are destroyed and the cache entry stays in the cache, subsequent
registrations might reuse the entry and it will eventually be filled with
new mkeys without cleanup ever getting scheduled again.
On workloads that register and deregister MRs with a wide range of
properties we see the cache ends up holding many cache entries, each
holding the max number of mkeys that were ever used through it.
Additionally, as the cleanup work is scheduled to run over the whole
cache, any mkey that is returned to the cache after the cleanup was
scheduled will be held for less than the intended 30 seconds timeout.
Solve both issues by dropping the existing remove_ent_work and reusing
the existing per-entry work to also handle the temp entries cleanup.
Schedule the work to run with a 30 seconds delay every time we push an
mkey to a clean temp entry.
This ensures the cleanup runs on each entry only 30 seconds after the
first mkey was pushed to an empty entry.
As we have already been distinguishing between persistent and temp entries
when scheduling the cache_work_func, it is not being scheduled in any
other flows for the temp entries.
Another benefit from moving to a per-entry cleanup is we now not
required to hold the rb_tree mutex, thus enabling other flow to run
concurrently.
Fixes: dd1b913fb0 ("RDMA/mlx5: Cache all user cacheable mkeys on dereg MR flow")
Signed-off-by: Michael Guralnik <michaelgur@nvidia.com>
Link: https://patch.msgid.link/e4fa4bb03bebf20dceae320f26816cd2dde23a26.1725362530.git.leon@kernel.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>
When searching the MR cache for suitable cache entries, don't use mkeys
larger than twice the size required for the MR.
This should ensure the usage of mkeys closer to the minimal required size
and reduce memory waste.
On driver init we create entries for mkeys with clear attributes and
powers of 2 sizes from 4 to the max supported size.
This solves the issue for anyone using mkeys that fit these
requirements.
In the use case where an MR is registered with different attributes,
like an access flag we can't UMR, we'll create a new cache entry to store
it upon dereg.
Without this fix, any later registration with same attributes and smaller
size will use the newly created cache entry and it's mkeys, disregarding
the memory waste of using mkeys larger than required.
For example, one worst-case scenario can be when registering and
deregistering a 1GB mkey with ATS enabled which will cause the creation of
a new cache entry to hold those type of mkeys. A user registering a 4k MR
with ATS will end up using the new cache entry and an mkey that can
support a 1GB MR, thus wasting x250k memory than actually needed in the HW.
Additionally, allow all small registration to use the smallest size
cache entry that is initialized on driver load even if size is larger
than twice the required size.
Fixes: 73d09b2fe8 ("RDMA/mlx5: Introduce mlx5r_cache_rb_key")
Signed-off-by: Michael Guralnik <michaelgur@nvidia.com>
Link: https://patch.msgid.link/8ba3a6e3748aace2026de8b83da03aba084f78f4.1725362530.git.leon@kernel.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>
After an mkey is created, update the counter for pending mkeys before
reshceduling the work that is filling the cache.
Rescheduling the work with a full MR cache entry and a wrong 'pending'
counter will cause us to miss disabling the fill_to_high_water flag.
Thus leaving the cache full but with an indication that it's still
needs to be filled up to it's full size (2 * limit).
Next time an mkey will be taken from the cache, we'll unnecessarily
continue the process of filling the cache to it's full size.
Fixes: 57e7071683 ("RDMA/mlx5: Implement mkeys management via LIFO queue")
Signed-off-by: Michael Guralnik <michaelgur@nvidia.com>
Link: https://patch.msgid.link/0f44f462ba22e45f72cb3d0ec6a748634086b8d0.1725362530.git.leon@kernel.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Gen P7 adapters needs to share a toggle bits information received
in kernel driver with the user space. User space needs this
info to arm the SRQ.
User space application can get this page using the
UAPI routines. Library will mmap this page and get the
toggle bits to be used in the next ARM Doorbell.
Uses a hash list to map the SRQ structure from the SRQ ID.
SRQ structure is retrieved from the hash list while the
library calls the UAPI routine to get the toggle page
mapping. Currently the full page is mapped per SRQ. This
can be optimized to enable multiple SRQs from the same
application share the same page and different offsets
in the page
Signed-off-by: Chandramohan Akula <chandramohan.akula@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://patch.msgid.link/1724945645-14989-4-git-send-email-selvin.xavier@broadcom.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
