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path: root/net/smc/smc_core.c
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2019-06-26net/smc: hold conns_lock before calling smc_lgr_register_conn()Huaping Zhou
After smc_lgr_create(), the newly created link group is added to smc_lgr_list, thus is accessible from other context. Although link group creation is serialized by smc_create_lgr_pending, the new link group may still be accessed concurrently. For example, if ib_device is no longer active, smc_ib_port_event_work() will call smc_port_terminate(), which in turn will call __smc_lgr_terminate() on every link group of this device. So conns_lock is required here. Signed-off-by: Huaping Zhou <zhp@smail.nju.edu.cn> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-12net/smc: improve smc_conn_create reason codesKarsten Graul
Rework smc_conn_create() to always return a valid DECLINE reason code. This removes the need to translate the return codes on 4 different places and allows to easily add more detailed return codes by changing smc_conn_create() only. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-12net/smc: cleanup of get vlan idKarsten Graul
The vlan_id of the underlying CLC socket was retrieved two times during processing of the listen handshaking. Change this to get the vlan id one time in connect and in listen processing, and reuse the id. And add a new CLC DECLINE return code for the case when the retrieval of the vlan id failed. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-12net/smc: consolidate function parametersKarsten Graul
During initialization of an SMC socket a lot of function parameters need to get passed down the function call path. Consolidate the parameters in a helper struct so there are less enough parameters to get all passed by register. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-12net/smc: check connections in smc_lgr_free_workKarsten Graul
Remove the shortcut that smc_lgr_free() would skip the check for existing connections when the link group is not in the link group list. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-08Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
An ipvlan bug fix in 'net' conflicted with the abstraction away of the IPV6 specific support in 'net-next'. Similarly, a bug fix for mlx5 in 'net' conflicted with the flow action conversion in 'net-next'. Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-07net/smc: move code to clear the conn->lgr fieldKarsten Graul
The lgr field of an smc_connection is set in smc_conn_create() and should be cleared in smc_conn_free() for consistency reasons, so move the responsible code. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-04net/smc: delete rkey first before switching to unusedUrsula Braun
Once RMBs are flagged as unused they are candidates for reuse. Thus the LLC DELETE RKEY operaton should be made before flagging the RMB as unused. Fixes: c7674c001b11 ("net/smc: unregister rkeys of unused buffer") Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-01net/smc: prevent races between smc_lgr_terminate() and smc_conn_free()Karsten Graul
To prevent races between smc_lgr_terminate() and smc_conn_free() add an extra check of the lgr field before accessing it, and cancel a delayed free_work when a new smc connection is created. This fixes the problem that free_work cleared the lgr variable but smc_lgr_terminate() or smc_conn_free() still access it in parallel. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-11-24Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
2018-11-23net/smc: unregister rkeys of unused bufferKarsten Graul
When an rmb is no longer in use by a connection, unregister its rkey at the remote peer with an LLC DELETE RKEY message. With this change, unused buffers held in the buffer pool are no longer registered at the remote peer. They are registered before the buffer is actually used and unregistered when they are no longer used by a connection. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-11-23net/smc: no link delete for a never active linkUrsula Braun
If a link is terminated that has never reached the active state, there is no need to trigger an LLC DELETE LINK. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-11-23net/smc: make smc_lgr_free() staticUrsula Braun
smc_lgr_free() is just called inside smc_core.c. Make it static. Just cleanup, no functional change. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-11-21net/smc: add SMC-D shutdown signalHans Wippel
When a SMC-D link group is freed, a shutdown signal should be sent to the peer to indicate that the link group is invalid. This patch adds the shutdown signal to the SMC code. Signed-off-by: Hans Wippel <hwippel@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-11-21net/smc: use queue pair number when matching link groupKarsten Graul
When searching for an existing link group the queue pair number is also to be taken into consideration. When the SMC server sends a new number in a CLC packet (keeping all other values equal) then a new link group is to be created on the SMC client side. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-10-26net/smc: fix smc_buf_unuse to use the lgr pointerKarsten Graul
The pointer to the link group is unset in the smc connection structure right before the call to smc_buf_unuse. Provide the lgr pointer to smc_buf_unuse explicitly. And move the call to smc_lgr_schedule_free_work to the end of smc_conn_free. Fixes: a6920d1d130c ("net/smc: handle unregistered buffers") Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-16Merge branch 'linus/master' into rdma.git for-nextJason Gunthorpe
rdma.git merge resolution for the 4.19 merge window Conflicts: drivers/infiniband/core/rdma_core.c - Use the rdma code and revise with the new spelling for atomic_fetch_add_unless drivers/nvme/host/rdma.c - Replace max_sge with max_send_sge in new blk code drivers/nvme/target/rdma.c - Use the blk code and revise to use NULL for ib_post_recv when appropriate - Replace max_sge with max_recv_sge in new blk code net/rds/ib_send.c - Use the net code and revise to use NULL for ib_post_recv when appropriate Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-08-16Revert "net/smc: Replace ib_query_gid with rdma_get_gid_attr"Jason Gunthorpe
This reverts commit ddb457c6993babbcdd41fca638b870d2a2fc3941. The include rdma/ib_cache.h is kept, and we have to add a memset to the compat wrapper to avoid compiler warnings in gcc-7 This revert is done to avoid extensive merge conflicts with SMC changes in netdev during the 4.19 merge window. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-07-25net/smc: improve delete link processingKarsten Graul
Send an orderly DELETE LINK request before termination of a link group, add support for client triggered DELETE LINK processing. And send a disorderly DELETE LINK before module is unloaded. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-25net/smc: use correct vlan gid of RoCE deviceUrsula Braun
SMC code uses the base gid for VLAN traffic. The gids exchanged in the CLC handshake and the gid index used for the QP have to switch from the base gid to the appropriate vlan gid. When searching for a matching IB device port for a certain vlan device, it does not make sense to return an IB device port, which is not enabled for the used vlan_id. Add another check whether a vlan gid exists for a certain IB device port. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-06-30net/smc: add SMC-D support in af_smcHans Wippel
This patch ties together the previous SMC-D patches. It adds support for SMC-D to the listen and connect functions and, thus, enables SMC-D support in the SMC code. If a connection supports both SMC-R and SMC-D, SMC-D is preferred. Signed-off-by: Hans Wippel <hwippel@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Suggested-by: Thomas Richter <tmricht@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-06-30net/smc: add SMC-D support in data transferHans Wippel
The data transfer and CDC message headers differ in SMC-R and SMC-D. This patch adds support for the SMC-D data transfer to the existing SMC code. It consists of the following: * SMC-D CDC support * SMC-D tx support * SMC-D rx support The CDC header is stored at the beginning of the receive buffer. Thus, a rx_offset variable is added for the CDC header offset within the buffer (0 for SMC-R). Signed-off-by: Hans Wippel <hwippel@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Suggested-by: Thomas Richter <tmricht@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-06-30net/smc: add base infrastructure for SMC-D and ISMHans Wippel
SMC supports two variants: SMC-R and SMC-D. For data transport, SMC-R uses RDMA devices, SMC-D uses so-called Internal Shared Memory (ISM) devices. An ISM device only allows shared memory communication between SMC instances on the same machine. For example, this allows virtual machines on the same host to communicate via SMC without RDMA devices. This patch adds the base infrastructure for SMC-D and ISM devices to the existing SMC code. It contains the following: * ISM driver interface: This interface allows an ISM driver to register ISM devices in SMC. In the process, the driver provides a set of device ops for each device. SMC uses these ops to execute SMC specific operations on or transfer data over the device. * Core SMC-D link group, connection, and buffer support: Link groups, SMC connections and SMC buffers (in smc_core) are extended to support SMC-D. * SMC type checks: Some type checks are added to prevent using SMC-R specific code for SMC-D and vice versa. To actually use SMC-D, additional changes to pnetid, CLC, CDC, etc. are required. These are added in follow-up patches. Signed-off-by: Hans Wippel <hwippel@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Suggested-by: Thomas Richter <tmricht@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-06-18net/smc: Replace ib_query_gid with rdma_get_gid_attrParav Pandit
Push the copy of the gid_attr into the SMC code. This probably doesn't push it far enough, as it looks like the conn->lgr should potentially hold the reference for its lifetime. Signed-off-by: Parav Pandit <parav@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-05-23net/smc: longer delay when freeing client link groupsUrsula Braun
Client link group creation always follows the server linkgroup creation. If peer creates a new server link group, client has to create a new client link group. If peer reuses a server link group for a new connection, client has to reuse its client link group as well. To avoid out-of-sync conditions for link groups a longer delay for for client link group removal is defined to make sure this link group still exists, once the peer decides to reuse a server link group. Currently the client link group delay time is just 10 jiffies larger than the server link group delay time. This patch increases the delay difference to 10 seconds to have a better protection against out-of-sync link groups. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-23net/smc: urgent data supportStefan Raspl
Add support for out of band data send and receive. Signed-off-by: Stefan Raspl <raspl@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-23net/smc: lock smc_lgr_list in port_terminate()Hans Wippel
Currently, smc_port_terminate() is not holding the lock of the lgr list while it is traversing the list. This patch adds locking to this function and changes smc_lgr_terminate() accordingly. Signed-off-by: Hans Wippel <hwippel@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-18net/smc: change smc_buf_free function parametersHans Wippel
This patch changes the function smc_buf_free to use the SMC link group instead of the link as function parameter. Also, it changes the order of the other two parameters. Signed-off-by: Hans Wippel <hwippel@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-18net/smc: do a few smc_core.c cleanupsHans Wippel
This patch consists of Christmas tree fixes and removal of an unneeded function parameter. Signed-off-by: Hans Wippel <hwippel@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-18net/smc: move smc_core specific code from smc.h to smc_coreHans Wippel
SMC connection and buffer handling belong to smc_core. So, this patch moves this code from smc.h to smc_core. Signed-off-by: Hans Wippel <hwippel@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-18net/smc: move link group list to smc_coreHans Wippel
This patch moves the global link group list to smc_core where the link group functions are. To make this work, it moves code in af_smc and smc_ib that operates on the link group list to smc_core as well. While at it, the link group counter is integrated into the list structure and initialized to zero. Signed-off-by: Hans Wippel <hwippel@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-18net/smc: add common buffer size in send and receive buffer descriptorsHans Wippel
In addition to the buffer references, SMC currently stores the sizes of the receive and send buffers in each connection as separate variables. This patch introduces a buffer length variable in the common buffer descriptor and uses this length instead. Signed-off-by: Hans Wippel <hwippel@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-16net/smc: check for pending terminationKarsten Graul
Avoid to run the processing in smc_lgr_terminate() more than once, remember when the link group termination is triggered. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-16net/smc: set link inactive before calling smc_lgr_free()Karsten Graul
Before smc_lgr_free() is called the link must be set inactive by calling smc_llc_link_inactive(). Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-16net/smc: use a workqueue to defer llc sendKarsten Graul
SMC handles deferred work in tasklets. As tasklets cannot sleep this can result in rare EBUSY conditions, so defer this work in a work queue. The high level api functions do not defer work because they can sleep until the llc send is actually completed. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-16net/smc: move link llc initialization to llc layerKarsten Graul
Move the llc layer specific initialization and cleanup out of smc_core.c into smc_llc.c (smc_llc_link_init and smc_llc_link_clear). Move all initialization of a link into the new init function. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-16net/smc: register new rmbs with the peerKarsten Graul
Register new rmb buffers with the remote peer by exchanging a confirm_rkey llc message. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-04smc: allocate RMBs as compound pagesStefan Raspl
Preparatory work for splice() support. Signed-off-by: Stefan Raspl <raspl@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>< Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-04Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
Overlapping changes in selftests Makefile. Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-03net/smc: handle unregistered buffersKarsten Graul
When smc_wr_reg_send() fails then tag (regerr) the affected buffer and free it in smc_buf_unuse(). Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-02net/smc: determine vlan_id of stacked net_deviceUrsula Braun
An SMC link group is bound to a specific vlan_id. Its link uses the RoCE-GIDs established for the specific vlan_id. This patch makes sure the appropriate vlan_id is determined for stacked scenarios like for instance a master bonding device with vlan devices enslaved. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-02net/smc: periodic testlink supportKarsten Graul
Add periodic LLC testlink support to ensure the link is still active. The interval time is initialized using the value of sysctl_tcp_keepalive_time. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-14net/smc: schedule free_work when link group is terminatedKarsten Graul
The free_work worker must be scheduled when the link group is abnormally terminated. Signed-off-by: Karsten Graul <kgraul@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-14net/smc: free link group without pending free_work onlyUrsula Braun
Make sure there is no pending or running free_work worker for the link group when freeing the link group. Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-06Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
All of the conflicts were cases of overlapping changes. In net/core/devlink.c, we have to make care that the resouce size_params have become a struct member rather than a pointer to such an object. Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-01net/smc: prevent new connections on link groupKarsten Graul
When the processing of a DELETE LINK message has started, new connections should not be added to the link group that is about to terminate. Signed-off-by: Karsten Graul <kgraul@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-01net/smc: process add/delete link messagesKarsten Graul
Add initial support for the LLC messages ADD LINK and DELETE LINK. Introduce a link state field. Extend the initial LLC handshake with ADD LINK processing. Signed-off-by: Karsten Graul <kgraul@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-01net/smc: process confirm/delete rkey messagesKarsten Graul
Process and respond to CONFIRM RKEY and DELETE RKEY messages. Signed-off-by: Karsten Graul <kgraul@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-01net/smc: remove unused fields from smc structuresKarsten Graul
The daddr field holds the destination IPv4 address. The field was set but never used and can be removed. The addr field was a left-over from an earlier version of non-blocking connects and can be removed. The result of the call to kernel_getpeername is not used, the call can be removed. Non-blocking connects are working, so remove restriction comment. Signed-off-by: Karsten Graul <kgraul@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-28net/smc: use link_id of server in confirm link replyKarsten Graul
The CONFIRM LINK reply message must contain the link_id sent by the server. And set the link_id explicitly when initializing the link. Signed-off-by: Karsten Graul <kgraul@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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