- 30 Aug, 2015 40 commits
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Yishai Hadas authored
Currently, IB/cma remove_one flow blocks until all user descriptor managed by IB/ucma are released. This prevents hot-removal of IB devices. This patch allows IB/cma to remove devices regardless of user space activity. Upon getting the RDMA_CM_EVENT_DEVICE_REMOVAL event we close all the underlying HW resources for the given ucontext. The ucontext itself is still alive till its explicit destroying by its creator. Running applications at that time will have some zombie device, further operations may fail. Signed-off-by:
Yishai Hadas <yishaih@mellanox.com> Signed-off-by:
Shachar Raindel <raindel@mellanox.com> Reviewed-by:
Haggai Eran <haggaie@mellanox.com> Signed-off-by:
Doug Ledford <dledford@redhat.com>
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Yishai Hadas authored
Implements the IB core disassociate_ucontext API. The driver detaches the HW resources for a given user context to prevent a dependency between application termination and device disconnecting. This is done by managing the VMAs that were mapped to the HW bars such as door bell and blueflame. When need to detach remap them to an arbitrary kernel page returned by the zap API. Signed-off-by:
Jack Morgenstein <jackm@mellanox.com> Signed-off-by:
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Yishai Hadas authored
Enables the uverbs_remove_one to succeed despite the fact that there are running IB applications working with the given ib device. This functionality enables a HW device to be unbind/reset despite the fact that there are running user space applications using it. It exposes a new IB kernel API named 'disassociate_ucontext' which lets a driver detaching its HW resources from a given user context without crashing/terminating the application. In case a driver implemented the above API and registered with ib_uverb there will be no dependency between its device to its uverbs_device. Upon calling remove_one of ib_uverbs the call should return after disassociating the open HW resources without waiting to clients disconnecting. In case driver didn't implement this API there will be no change to current behaviour and uverbs_remove_one will return only when last client has disconnected and reference count on uverbs device became 0. In case the lower driver device was removed any application will continue working over some zombie HCA, further calls will ended with an immediate error. Signed-off-by:
Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Signed-off-by:
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Yishai Hadas authored
Done in preparation for deploying RCU for the device removal flow. Allows isolating the RCU handling to the uverb_main layer and keeping the uverbs_cmd code as is. Signed-off-by:
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Yishai Hadas authored
Fixes: 2a72f212 ("IB/uverbs: Remove dev_table") Before this commit there was a device look-up table that was protected by a spin_lock used by ib_uverbs_open and by ib_uverbs_remove_one. When it was dropped and container_of was used instead, it enabled the race with remove_one as dev might be freed just after: dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev) but before the kref_get. In addition, this buggy patch added some dead code as container_of(x,y,z) can never be NULL and so dev can never be NULL. As a result the comment above ib_uverbs_open saying "the open method will either immediately run -ENXIO" is wrong as it can never happen. The solution follows Jason Gunthorpe suggestion from below URL: https://www.mail-archive.com/linux-rdma@vger.kernel.org/msg25692.html cdev will hold a kref on the parent (the containing structure, ib_uverbs_device) and only when that kref is released it is guaranteed that open will never be called again. In addition, fixes the active count scheme to use an atomic not a kref to prevent WARN_ON as pointed by above comment from Jason. Signed-off-by:
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Yishai Hadas authored
Fix the reference counting usage to be handled in the event file creation/destruction function, instead of being done by the caller. This is done for both async/non-async event files. Based on Jason Gunthorpe report at https://www.mail-archive.com/ linux-rdma@vger.kernel.org/msg24680.html: "The existing code for this is broken, in ib_uverbs_get_context all the error paths between ib_uverbs_alloc_event_file and the kref_get(file->ref) are wrong - this will result in fput() which will call ib_uverbs_event_close, which will try to do kref_put and ib_unregister_event_handler - which are no longer paired." Signed-off-by:
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Jason Gunthorpe authored
The majority of callers never check the return value, and even if they did, they can't do anything about a failure. All possible failure cases represent a bug in the caller, so just WARN_ON inside the function instead. This fixes a few random errors: net/rd/iw.c infinite loops while it fails. (racing with EBUSY?) This also lays the ground work to get rid of error return from the drivers. Most drivers do not error, the few that do are broken since it cannot be handled. Since uverbs can legitimately make use of EBUSY, open code the check. Signed-off-by:
Chuck Lever <chuck.lever@oracle.com> Signed-off-by:
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Bart Van Assche authored
The SRP initiator only needs this if the insecure register_always=N performance optimization is enabled, or if FRWR/FMR is not supported in the driver. Do not create an all physical MR unless it is needed to support either of those modes. Default register_always to true so the out of the box configuration does not create an insecure all physical MR. Signed-off-by:
Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by:
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Bart Van Assche authored
Instead of always using the global rkey for the indirect data buffer descriptor, register that descriptor with the HCA if the kernel module parameter register_always has been set to Y. Signed-off-by:
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Bart Van Assche authored
Introduce the variable srp_device.use_fmr. Leave out the dev->has_fr / dev->has_fmr and ch->fr_pool / ch->fmr_pool checks since these are redundant. This patch does not change any functionality but makes the source code easier to read. Signed-off-by:
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Bart Van Assche authored
Move the srp_map_desc() call from inside srp_map_sg_entry() to srp_map_sg() such that the use_mr argument can be removed from srp_map_sg_entry(). Signed-off-by:
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Bart Van Assche authored
Mapping a discontiguous sg-list requires multiple memory regions and hence can exhaust the memory region pool. The SRP initiator already handles this by temporarily reducing the queue depth. This means that it is safe to remove the memory registration backtracking code. This patch has been tested with direct I/O sizes up to 256 MB. Signed-off-by:
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Bart Van Assche authored
Although most paths through which a request is submitted check block layer parameters like the max_segments limit, these are not checked when an SG_IO or direct I/O request is submitted. Hence add a range check for the memory descriptor array pointer. Signed-off-by:
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Bart Van Assche authored
Instead of using the global rkey for large memory regions, use multiple registrations. See also the while (dma_len) loop further down in srp_map_sg_entry(). Signed-off-by:
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Bart Van Assche authored
During a discussion in 2011 nobody recalled why FMR was not used for non-page aligned buffers (see also http://thread.gmane.org/gmane.linux.drivers.rdma/7149). Re-enable FMR for such buffers. For the reason why the srp_map_fmr() function needs to be modified, see also patch "IB/srp: rework mapping engine to use multiple FMR entries" (commit ID 8f26c9ff; January 2011). Signed-off-by:
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Jason Gunthorpe authored
The pd now has a local_dma_lkey member which completely replaces ib_get_dma_mr, use it instead. Signed-off-by:
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Jason Gunthorpe authored
The pd now has a local_dma_lkey member which completely replaces ib_get_dma_mr, use it instead. Signed-off-by:
Dominique Martinet <dominique.martinet@cea.fr> Signed-off-by:
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Jason Gunthorpe authored
The pd now has a local_dma_lkey member which completely replaces ib_get_dma_mr, use it instead. Signed-off-by:
Sagi Grimberg <sagig@mellanox.com> Signed-off-by:
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Jason Gunthorpe authored
Replace all leys with pd->local_dma_lkey. This driver does not support iWarp, so this is safe. The insecure use of ib_get_dma_mr is thus isolated to an rkey, and will have to be fixed separately. Signed-off-by:
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Jason Gunthorpe authored
The pd now has a local_dma_lkey member which completely replaces ib_get_dma_mr, use it instead. Signed-off-by:
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Jason Gunthorpe authored
Replace all leys with pd->local_dma_lkey. This driver does not support iWarp, so this is safe. The insecure use of ib_get_dma_mr is thus isolated to an rkey, and this looks trivially fixed by forcing the use of registration in a future patch. Signed-off-by:
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Jason Gunthorpe authored
The pd now has a local_dma_lkey member which completely replaces ib_get_dma_mr, use it instead. Signed-off-by:
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Jason Gunthorpe authored
The pd now has a local_dma_lkey member which completely replaces ib_get_dma_mr, use it instead. Signed-off-by:
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Jason Gunthorpe authored
The pd now has a local_dma_lkey member which completely replaces ib_get_dma_mr, use it instead. Signed-off-by:
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Jason Gunthorpe authored
The pd now has a local_dma_lkey member which completely replaces ib_get_dma_mr, use it instead. Signed-off-by:
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Jason Gunthorpe authored
Every single ULP requires a local_dma_lkey to do anything with a QP, so let us ensure one exists for every PD created. If the driver can supply a global local_dma_lkey then use that, otherwise ask the driver to create a local use all physical memory MR associated with the new PD. Signed-off-by:
Sagi Grimberg <sagig@dev.mellanox.co.il> Acked-by:
Christoph Hellwig <hch@infradead.org> Reviewed-by:
Steve Wise <swise@opengridcomputing.com> Reviewed-by:
Ira Weiny <ira.weiny@intel.com> Tested-by:
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Sagi Grimberg authored
Chaning of send work requests benefits performance by reducing the send queue lock contention (acquired in ib_post_send) and saves us HW doorbells which is posted only once. Currently, in normal IO flows iser does not chain the CDB send work request with the registration work request. Also in PI flows, signature work requests are not chained as well. Lets chain those and post only once. Signed-off-by:
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Sagi Grimberg authored
Easier to debug when we have the registration details. This patch does not change any functionality. Signed-off-by:
Adir Lev <adirl@mellanox.com> Signed-off-by:
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Sagi Grimberg authored
iser support up to 512KB data transfer in a single scsi command. This means that larger IOs will split to different request. While iser can easily saturate FDR/EDR wires, some arrays are fine tuned for 1MB (or larger) IO sizes, hence add an option to support larger transfers (up to 8MB) if the device allows it. Given that a few target implementations don't support data transfers of more than 512KB by default and the fact that larger IO sizes require more resources, we introduce a module parameter to determine the maximum number of 512B sectors in a single scsi command. Users that are interested in larger transfers can change this value given that the target supports larger transfers. At the moment, iser works in 4K pages granularity, In a later stage we will get it to work with system page size instead. IO operations that consists of N pages will need a page vector of size N+1 in case the first SG element contains an offset. Given that some devices allocates memory regions in powers of 2, this means that allocating a region with N+1 pages, will result in region resources allocation of the next power of 2. Since we don't want that to happen, in case we are in the limit of IO size supported and the first SG element has an offset, we align the SG list using a bounce buffer (which is OK given that this is not likely to happen a lot). Signed-off-by:
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Sagi Grimberg authored
Hard coded for now. This will allow to allocate different sized MRs depending on the IO size needed (and device capabilities). This patch does not change any functionality. Signed-off-by:
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Sagi Grimberg authored
iser_reg_rdma_mem_[fastreg|fmr] share a lot of code, and logically do the same thing other than the buffer registration method itself (iser_fast_reg_mr vs. iser_fast_reg_fmr). The DIF logic is not implemented in the FMR flow as there is no existing device that supports FMRs and Signature feature. This patch unifies the flow in a single routine iser_reg_rdma_mem and just split to fmr/frwr for the buffer registration itself. Also, for symmetry reasons, unify iser_unreg_rdma_mem (which will call the relevant device specific unreg routine). Signed-off-by:
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Sagi Grimberg authored
As for fmrs we will hold a single registration descriptor as no need for multiple like in the frwr mode (descriptor for each task). This change helps unifying the duplicate registration code paths. Signed-off-by:
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Sagi Grimberg authored
Also, change a name of a local variable. This patch does not change any functionality. Signed-off-by:
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Adir Lev authored
This will allow us to unify the memory registration code path between the various methods which vary by the device capabilities. This change will make it easier and less intrusive to remove fmr_pools from the code when we'd want to. The reason we use a single descriptor is to avoid taking a redundant spinlock when working with FMRs. We also change the signature of iser_reg_page_vec to make it match iser_fast_reg_mr (and the future indirect registration method). Signed-off-by:
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Sagi Grimberg authored
Instead of having it a part of the connection structure, have it be under a dedicated (embedded) structure in the connection. A logical separation of the registration pool and the connection structure. Signed-off-by:
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Sagi Grimberg authored
Don't have the caller allocate the structure and worry about freeing it in case the routine failed. This patch does not change any functionality. Signed-off-by:
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Sagi Grimberg authored
Move all the per-device function pointers to an easy extensible iser_reg_ops structure that contains all the iser registration operations. Signed-off-by:
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Sagi Grimberg authored
In the past the we always tried to allocate an fmr_pool and if it failed on ENOSYS (not supported) then we continued with dma mr. This is not the case anymore and if we tried to allocate an fmr_pool then it is supported and we expect to succeed. Also, the check if fmr_pool is allocated when free is called is redundant as well as we are guaranteed it exists. Signed-off-by:
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Sagi Grimberg authored
Avoid struct names without iser_ prefix. This patch does not change any functionality. Signed-off-by:
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Sagi Grimberg authored
Have fast_reg_descriptor hold struct iser_reg_resources (mr, frpl, valid flag). This will be useful when the actual buffer registration routines will be passed with the needed registration resources (i.e. iser_reg_resources) without being aware of their nature (i.e. data or protection). In order to achieve this, we remove reg_indicators flags container and place specific flags (mr_valid) within iser_reg_resources struct. We also place the sig_mr_valid and sig_protcted flags in iser_pi_context. This patch also modifies iser_fast_reg_mr to receive the reg_resources instead of the fast_reg_descriptor and a data/protection indicator. Signed-off-by:
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