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2021-09-14net/smc: add support for user defined EIDsKarsten Graul1-0/+1
SMC-Dv2 allows users to define EIDs which allows to create separate name spaces enabling users to cluster their SMC-Dv2 connections. Add support for user defined EIDs and extent the generic netlink interface so users can add, remove and dump EIDs. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Guvenc Gulce <guvenc@linux.ibm.com> Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-08-09net/smc: Correct smc link connection counter in case of smc clientGuvenc Gulce1-0/+2
SMC clients may be assigned to a different link after the initial connection between two peers was established. In such a case, the connection counter was not correctly set. Update the connection counter correctly when a smc client connection is assigned to a different smc link. Fixes: 07d51580ff65 ("net/smc: Add connection counters for links") Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com> Tested-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-08-09net/smc: fix wait on already cleared linkKarsten Graul1-0/+2
There can be a race between the waiters for a tx work request buffer and the link down processing that finally clears the link. Although all waiters are woken up before the link is cleared there might be waiters which did not yet get back control and are still waiting. This results in an access to a cleared wait queue head. Fix this by introducing atomic reference counting around the wait calls, and wait with the link clear processing until all waiters have finished. Move the work request layer related calls into smc_wr.c and set the link state to INACTIVE before calling smcr_link_clear() in smc_llc_srv_add_link(). Fixes: 15e1b99aadfb ("net/smc: no WR buffer wait for terminating link group") Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-04-01net: smc: Remove repeated struct declarationWan Jiabing1-1/+0
struct smc_clc_msg_local is declared twice. One is declared at 301st line. The blew one is not needed. Remove the duplicate. Signed-off-by: Wan Jiabing <wanjiabing@vivo.com> Acked-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-12-01net/smc: Add support for obtaining SMCD device listGuvenc Gulce1-0/+28
Deliver SMCD device information via netlink based diagnostic interface. Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-12-01net/smc: Add SMC-D Linkgroup diagnostic supportGuvenc Gulce1-0/+1
Deliver SMCD Linkgroup information via netlink based diagnostic interface. Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-12-01net/smc: Introduce SMCR get link commandGuvenc Gulce1-0/+14
Introduce get link command which loops through all available links of all available link groups. It uses the SMC-R linkgroup list as entry point, not the socket list, which makes linkgroup diagnosis possible, in case linkgroup does not contain active connections anymore. Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-12-01net/smc: Introduce SMCR get linkgroup commandGuvenc Gulce1-0/+1
Introduce get linkgroup command which loops through all available SMCR linkgroups. It uses the SMC-R linkgroup list as entry point, not the socket list, which makes linkgroup diagnosis possible, in case linkgroup does not contain active connections anymore. Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-12-01net/smc: Add support for obtaining system informationGuvenc Gulce1-0/+2
Add new netlink command to obtain system information of the smc module. Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-12-01net/smc: Add diagnostic information to link structureGuvenc Gulce1-0/+2
During link creation add net-device ifindex and ib-device name to link structure. This is needed for diagnostic purposes. When diagnostic information is gathered, we need to traverse device, linkgroup and link structures, to be able to do that we need to hold a spinlock for the linkgroup list, without this diagnostic information in link structure, another device list mutex holding would be necessary to dereference the device pointer in the link structure which would be impossible when holding a spinlock already. Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-12-01net/smc: Add connection counters for linksGuvenc Gulce1-0/+1
Add connection counters to the structure of the link. Increase/decrease the counters as needed in the corresponding routines. Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-10-31net/smc: improve return codes for SMC-Dv2Karsten Graul1-0/+1
To allow better problem diagnosis the return codes for SMC-Dv2 are improved by this patch. A few more CLC DECLINE codes are defined and sent to the peer when an SMC connection cannot be established. There are now multiple SMC variations that are offered by the client and the server may encounter problems to initialize all of them. Because only one diagnosis code can be sent to the client the decision was made to send the first code that was encountered. Because the server tries the variations in the order of importance (SMC-Dv2, SMC-D, SMC-R) this makes sure that the diagnosis code of the most important variation is sent. v2: initialize rc in smc_listen_v2_check(). Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Link: https://lore.kernel.org/r/20201031181938.69903-1-kgraul@linux.ibm.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-09-28net/smc: introduce CLC first contact extensionUrsula Braun1-0/+5
SMC Version 2 defines a first contact extension for CLC accept and CLC confirm. This patch covers sending and receiving of the CLC first contact extension. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-09-28net/smc: determine accepted ISM devicesUrsula Braun1-0/+1
SMCD Version 2 allows to propose up to 8 additional ISM devices offered to the peer as candidates for SMCD communication. This patch covers the server side, i.e. selection of an ISM device matching one of the proposed ISM devices, that will be used for CLC accept Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-09-28net/smc: determine proposed ISM devicesUrsula Braun1-0/+4
SMCD Version 2 allows to propose up to 8 additional ISM devices offered to the peer as candidates for SMCD communication. This patch covers determination of the ISM devices to be proposed. ISM devices without PNETID are preferred, since ISM devices with PNETID are a V1 leftover and will disappear over the time. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-09-28net/smc: introduce CHID callback for ISM devicesUrsula Braun1-0/+1
With SMCD version 2 the CHIDs of ISM devices are needed for the CLC handshake. This patch provides the new callback to retrieve the CHID of an ISM device. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-09-28net/smc: prepare for more proposed ISM devicesUrsula Braun1-2/+2
SMCD Version 2 allows proposing of up to 8 ISM devices in addition to the native ISM device of SMCD Version 1. This patch prepares the struct smc_init_info to deal with these additional 8 ISM devices. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-09-10net/smc: use separate work queues for different worker typesKarsten Graul1-0/+1
There are 6 types of workers which exist per smc connection. 3 of them are used for listen and handshake processing, another 2 are used for close and abort processing and 1 is the tx worker that moves calls to sleeping functions into a worker. To prevent flooding of the system work queue when many connections are opened or closed at the same time (some pattern uperf implements), move those workers to one of 3 smc-specific work queues. Two work queues are module-global and used for handshake and close workers. The third work queue is defined per link group and used by the tx workers that may sleep waiting for resources of this link group. And in smc_llc_enqueue() queue the llc_event_work work to the system prio work queue because its critical that this work is started fast. Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-09-10net/smc: immediate freeing in smc_lgr_cleanup_early()Ursula Braun1-1/+0
smc_lgr_cleanup_early() schedules the free worker with delay. DMB unregistering occurs in this delayed worker increasing the risk to reach the SMCD SBA limit without need. Terminate the linkgroup immediately, since termination means early DMB unregistering. For SMCD the global smc_server_lgr_pending lock is given up early. A linkgroup to be given up with smc_lgr_cleanup_early() may already contain more than one connection. Using __smc_lgr_terminate() in smc_lgr_cleanup_early() covers this. And consolidate smc_ism_put_vlan() and smc_put_device() into smc_lgr_free() only. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-09-10net/smc: introduce better field namesUrsula Braun1-6/+3
Field names "srv_first_contact" and "cln_first_contact" are misleading, since they apply to both, server and client. Rename them to "first_contact_peer" and "first_contact_local". Rename "ism_gid" by the more precise name "ism_peer_gid". Rename version constant "SMC_CLC_V1" into "SMC_V1". No functional change. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-19net/smc: do not call dma sync for unmapped memoryKarsten Graul1-0/+5
The dma related ...sync_sg... functions check the link state before the dma function is actually called. But the check in smc_link_usable() allows links in ACTIVATING state which are not yet mapped to dma memory. Under high load it may happen that the sync_sg functions are called for such a link which results in an debug output like DMA-API: mlx5_core 0002:00:00.0: device driver tries to sync DMA memory it has not allocated [device address=0x0000000103370000] [size=65536 bytes] To fix that introduce a helper to check for the link state ACTIVE and use it where appropriate. And move the link state update to ACTIVATING to the end of smcr_link_init() when most initial setup is done. Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Fixes: d854fcbfaeda ("net/smc: add new link state and related helpers") Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-08net/smc: separate LLC wait queues for flow and messagesKarsten Graul1-1/+3
There might be races in scenarios where both SMC link groups are on the same system. Prevent that by creating separate wait queues for LLC flows and messages. Switch to non-interruptable versions of wait_event() and wake_up() for the llc flow waiter to make sure the waiters get control sequentially. Fine tune the llc_flow_lock to include the assignment of the message. Write to system log when an unexpected message was dropped. And remove an extra indirection and use the existing local variable lgr in smc_llc_enqueue(). Fixes: 555da9af827d ("net/smc: add event-based llc_flow framework") Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-05net/smc: log important pnetid and state change eventsKarsten Graul1-1/+1
Print to system log when SMC links are available or go down, link group state changes or pnetids are applied to and removed from devices. The log entries are triggered by either user configuration actions or adapter activation/deactivation events and are not expected to happen often. The entries help SMC users to keep track of the SMC link group status and to detect when actions are needed (like to add replacements for failed adapters). Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-04net/smc: save SMC-R peer link_uidKarsten Graul1-0/+1
During SMC-R link establishment the peers exchange the link_uid that is used for debugging purposes. Save the peer link_uid in smc_link so it can be retrieved by the smc_diag netlink interface. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-04net/smc: create improved SMC-R link_uidKarsten Graul1-1/+3
The link_uid of an SMC-R link is exchanged between SMC peers and its value can be used for debugging purposes. Create a unique link_uid during link initialization and use it in communication with SMC-R peers. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-04net/smc: add termination reason and handle LLC protocol violationKarsten Graul1-0/+2
Allow to set the reason code for the link group termination, and set meaningful values before termination processing is triggered. This reason code is sent to the peer in the final delete link message. When the LLC request or response layer receives a message type that was not handled, drop a warning and terminate the link group. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-04net/smc: asymmetric link taggingKarsten Graul1-0/+4
New connections must not be assigned to asymmetric links. Add asymmetric link tagging using new link variable link_is_asym. The new helpers smcr_lgr_set_type() and smcr_lgr_set_type_asym() are called to set the state of the link group, and tag all links accordingly. smcr_lgr_conn_assign_link() respects the link tagging and will not assign new connections to links tagged as asymmetric link. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-04net/smc: wait for departure of an IB messageKarsten Graul1-0/+1
Introduce smc_wr_tx_send_wait() to send an IB message and wait for the tx completion event of the message. This makes sure that the message is no longer in-flight when the function returns. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-04net/smc: switch connections to alternate linkKarsten Graul1-0/+2
Add smc_switch_conns() to switch all connections from a link that is going down. Find an other link to switch the connections to, and switch each connection to the new link. smc_switch_cursor() updates the cursors of a connection to the state of the last successfully sent CDC message. When there is no link to switch to, terminate the link group. Call smc_switch_conns() when a link is going down. And with the possibility that links of connections can switch adapt CDC and TX functions to detect and handle link switches. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-03net/smc: llc_del_link_work and use the LLC flow for delete linkKarsten Graul1-1/+1
Introduce a work that is scheduled when a new DELETE_LINK LLC request is received. The work will call either the SMC client or SMC server DELETE_LINK processing. And use the LLC flow framework to process incoming DELETE_LINK LLC messages, scheduling the llc_del_link_work for those events. With these changes smc_lgr_forget() is only called by one function and can be migrated into smc_lgr_cleanup_early(). Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-03net/smc: first part of add link processing as SMC clientKarsten Graul1-0/+2
First set of functions to process an ADD_LINK LLC request as an SMC client. Find an alternate IB device, determine the new link group type and get the index for the new link. Then ready the link, map the buffers and send an ADD_LINK LLC response. If any error occurs, send a reject LLC message and terminate the processing. Add smc_llc_alloc_alt_link() to find a free link index for a new link, depending on the new link group type. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-01net/smc: llc_add_link_work to handle ADD_LINK LLC requestsKarsten Graul1-0/+1
Introduce a work that is scheduled when a new ADD_LINK LLC request is received. The work will call either the SMC client or SMC server ADD_LINK processing. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-01net/smc: allocate index for a new linkKarsten Graul1-1/+1
Add smc_llc_alloc_alt_link() to find a free link index for a new link, depending on the new link group type. And update constants for the maximum number of links to 3 (2 symmetric and 1 dangling asymmetric link). These maximum numbers are the same as used by other implementations of the SMC-R protocol. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-01net/smc: add smcr_port_err() and smcr_link_down() processingKarsten Graul1-1/+5
Call smcr_port_err() when an IB event reports an inactive IB device. smcr_port_err() calls smcr_link_down() for all affected links. smcr_link_down() either triggers the local DELETE_LINK processing, or sends an DELETE_LINK LLC message to the SMC server to initiate the processing. The old handler function smc_port_terminate() is removed. Add helper smcr_link_down_cond() to take a link down conditionally, and smcr_link_down_cond_sched() to schedule the link_down processing to a work. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-01net/smc: add smcr_port_add() and smcr_link_up() processingKarsten Graul1-0/+1
Call smcr_port_add() when an IB event reports a new active IB device. smcr_port_add() will start a work which either triggers the local ADD_LINK processing, or send an ADD_LINK LLC message to the SMC server to initiate the processing. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-01net/smc: remember PNETID of IB device for later device matchingKarsten Graul1-0/+2
The PNETID is needed to find an alternate link for a link group. Save the PNETID of the link that is used to create the link group for later device matching. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-01net/smc: mutex to protect the lgr against parallel reconfigurationsKarsten Graul1-0/+2
Introduce llc_conf_mutex in the link group which is used to protect the buffers and lgr states against parallel link reconfiguration. This ensures that new connections do not start to register buffers with the links of a link group when link creation or termination is running. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-01net/smc: map and register buffers for a new linkKarsten Graul1-0/+2
Introduce support to map and register all current buffers for a new link. smcr_buf_map_lgr() will map used buffers for a new link and smcr_buf_reg_lgr() can be called to register used buffers on the IB device of the new link. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-01net/smc: unmapping of buffers to support multiple linksKarsten Graul1-0/+1
With the support of multiple links that are created and cleared there is a need to unmap one link from all current buffers. Add unmapping by link and by rmb. And make smcr_link_clear() available to be called from the LLC layer. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-01net/smc: multiple link support for rmb buffer registrationKarsten Graul1-0/+1
The CONFIRM_RKEY LLC processing handles all links in one LLC message. Move the call to this processing out of smcr_link_reg_rmb() which does processing per link, into smcr_lgr_reg_rmbs() which is responsible for link group level processing. Move smcr_link_reg_rmb() into module smc_core.c. >From af_smc.c now call smcr_lgr_reg_rmbs() to register new rmbs on all available links. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-04-30net/smc: remove obsolete link state DELETINGKarsten Graul1-1/+0
The connection layer in af_smc.c is now using the new LLC flow framework, which made the link state DELETING obsolete. Remove the state and the respective helpers. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-04-30net/smc: new smc_rtoken_set functions for multiple link supportKarsten Graul1-0/+4
Introduce smc_rtoken_set() to set the rtoken for a new link to an existing rmb whose rtoken is given, and smc_rtoken_set2() to set an rtoken for a new link whose link_id is given. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-04-30net/smc: multiple link support and LLC flow for smc_llc_do_delete_rkeyKarsten Graul1-3/+0
Adapt smc_llc_do_delete_rkey() to use the LLC flow and support multiple links when deleting the rkeys for rmb buffers at the peer. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-04-30net/smc: multiple link support and LLC flow for smc_llc_do_confirm_rkeyKarsten Graul1-2/+0
Adapt smc_llc_do_confirm_rkey() to use the LLC flow and support the rkeys of multiple links when the CONFIRM_RKEY LLC message is build. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-04-30net/smc: adapt SMC client code to use the LLC flowKarsten Graul1-3/+0
Change the code that processes the SMC client part of connection establishment to use the LLC flow framework (CONFIRM_LINK request messages). Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-04-30net/smc: adapt SMC server code to use the LLC flowKarsten Graul1-3/+0
Change the code that processes the SMC server part of connection establishment to use the LLC flow framework (CONFIRM_LINK response messages). Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-04-30net/smc: introduce link group typeKarsten Graul1-0/+10
Add a type field to the link group which reflects the current link group redundancy state. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-04-30net/smc: add event-based llc_flow frameworkKarsten Graul1-0/+24
The new framework allows to start specific types of LLC control flows, protects active flows and makes it possible to wait for flows to finish before starting a new flow. This mechanism is used for the LLC control layer to model flows like 'add link' or 'delete link' which need to send/receive several LLC messages and are not allowed to get interrupted by the wrong type of messages. 'Add link' or 'Delete link' messages arriving in the middle of a flow are delayed and processed when the current flow finished. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-04-29net/smc: move llc layer related init and clear into smc_llc.cKarsten Graul1-0/+2
Introduce smc_llc_lgr_init() and smc_llc_lgr_clear() to implement all llc layer specific initialization and cleanup in module smc_llc.c. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-04-29net/smc: use mutex instead of rwlock_t to protect buffersKarsten Graul1-2/+2
The locks for sndbufs and rmbs are never used from atomic context. Using a mutex for these locks will allow to nest locks with other mutexes. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 18:42:39 +0000