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path: root/net/smc/smc_clc.c
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2022-01-13net/smc: Introduce a new conn->lgr validity check helperWen Gu1-1/+1
It is no longer suitable to identify whether a smc connection is registered in a link group through checking if conn->lgr is NULL, because conn->lgr won't be reset even the connection is unregistered from a link group. So this patch introduces a new helper smc_conn_lgr_valid() and replaces all the check of conn->lgr in original implementation with the new helper to judge if conn->lgr is valid to use. Signed-off-by: Wen Gu <guwen@linux.alibaba.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-01-02net/smc: remove redundant re-assignment of pointer linkColin Ian King1-1/+0
The pointer link is being re-assigned the same value that it was initialized with in the previous declaration statement. The re-assignment is redundant and can be removed. Fixes: 387707fdf486 ("net/smc: convert static link ID to dynamic references") Signed-off-by: Colin Ian King <colin.i.king@gmail.com> Reviewed-by: Tony Lu <tonylu@linux.alibaba.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-10-16net/smc: add v2 format of CLC decline messageKarsten Graul1-10/+37
The CLC decline message changed with SMC-Rv2 and supports up to 4 additional diagnosis codes. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-10-16net/smc: add SMC-Rv2 connection establishmentKarsten Graul1-19/+70
Send a CLC proposal message, and the remote side process this type of message and determine the target GID. Check for a valid route to this GID, and complete the connection establishment. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-10-16net/smc: prepare for SMC-Rv2 connectionKarsten Graul1-0/+11
Prepare the connection establishment with SMC-Rv2. Detect eligible RoCE cards and indicate all supported SMC modes for the connection. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-09-23Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski1-1/+2
net/mptcp/protocol.c 977d293e23b4 ("mptcp: ensure tx skbs always have the MPTCP ext") efe686ffce01 ("mptcp: ensure tx skbs always have the MPTCP ext") same patch merged in both trees, keep net-next. Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-09-21net/smc: add missing error check in smc_clc_prfx_set()Karsten Graul1-1/+2
Coverity stumbled over a missing error check in smc_clc_prfx_set(): *** CID 1475954: Error handling issues (CHECKED_RETURN) /net/smc/smc_clc.c: 233 in smc_clc_prfx_set() >>> CID 1475954: Error handling issues (CHECKED_RETURN) >>> Calling "kernel_getsockname" without checking return value (as is done elsewhere 8 out of 10 times). 233 kernel_getsockname(clcsock, (struct sockaddr *)&addrs); Add the return code check in smc_clc_prfx_set(). Fixes: c246d942eabc ("net/smc: restructure netinfo for CLC proposal msgs") Reported-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-09-14net/smc: add generic netlink support for system EIDKarsten Graul1-0/+62
With SMC-Dv2 users can configure if the static system EID should be used during CLC handshake, or if only user EIDs are allowed. Add generic netlink support to enable and disable the system EID, and to retrieve the system EID and its current enabled state. 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>
2021-09-14net/smc: keep static copy of system EIDKarsten Graul1-4/+1
The system EID is retrieved using an registered ISM device each time when needed. This adds some unnecessary complexity at all places where the system EID is needed, but no ISM device is at hand. Simplify the code and save the system EID in a static variable in smc_ism.c. 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>
2021-09-14net/smc: add support for user defined EIDsKarsten Graul1-13/+250
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>
2020-12-02net/smc: Add support for obtaining system informationGuvenc Gulce1-0/+5
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>
2020-09-29net/smc: CLC decline - V2 enhancementsUrsula Braun1-2/+3
This patch covers the small SMCD version 2 changes for CLC decline. 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>
2020-09-29net/smc: introduce CLC first contact extensionUrsula Braun1-5/+37
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>
2020-09-29net/smc: CLC accept / confirm V2Ursula Braun1-30/+69
The new format of SMCD V2 CLC accept and confirm is introduced, and building and checking of SMCD V2 CLC accepts / confirms is adapted accordingly. 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>
2020-09-29net/smc: build and send V2 CLC proposalUrsula Braun1-36/+135
The new format of an SMCD V2 CLC proposal is introduced, and building and checking of SMCD V2 CLC proposals is adapted accordingly. 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>
2020-09-29net/smc: determine proposed ISM devicesUrsula Braun1-6/+5
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>
2020-09-29net/smc: prepare for more proposed ISM devicesUrsula Braun1-1/+1
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>
2020-09-29net/smc: split CLC confirm/accept data to be sentUrsula Braun1-7/+14
When sending CLC confirm and CLC accept, separate the trailing part of the message from the initial part (to be prepared for future 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>
2020-09-29net/smc: separate find device functionsUrsula Braun1-3/+3
This patch provides better separation of device determinations in function smc_listen_work(). 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>
2020-09-29net/smc: CLC header fields renamingUrsula Braun1-10/+12
SMCD version 2 defines 2 more bits in the CLC header to specify version 2 types. This patch prepares better naming of the CLC header fields. 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>
2020-09-11net/smc: common routine for CLC accept and confirmUrsula Braun1-89/+58
smc_clc_send_accept() and smc_clc_send_confirm() are quite similar. Move common code into a separate function smc_clc_send_confirm_accept(). And introduce separate SMCD and SMCR struct definitions for CLC accept resp. confirm. 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>
2020-09-11net/smc: dynamic allocation of CLC proposal bufferUrsula Braun1-38/+50
Reduce stack size for smc_listen_work() and smc_clc_send_proposal() by dynamic allocation of the CLC buffer to be received or sent. 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>
2020-09-11net/smc: introduce better field namesUrsula Braun1-8/+8
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>
2020-07-08net/smc: tolerate future SMCD versionsUrsula Braun1-13/+32
CLC proposal messages of future SMCD versions could be larger than SMCD V1 CLC proposal messages. To enable toleration in SMC V1 the receival of CLC proposal messages is adapted: * accept larger length values in CLC proposal * check trailing eye catcher for incoming CLC proposal with V1 length only * receive the whole CLC proposal even in cases it does not fit into the V1 buffer Fixes: e7b7a64a8493d ("smc: support variable CLC proposal messages") 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>
2020-04-29net/smc: convert static link ID to dynamic referencesKarsten Graul1-6/+6
As a preparation for the support of multiple links remove the usage of a static link id (SMC_SINGLE_LINK) and allow dynamic link ids. 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>
2020-02-27net/smc: improve peer ID in CLC decline for SMC-RHans Wippel1-1/+2
According to RFC 7609, all CLC messages contain a peer ID that consists of a unique instance ID and the MAC address of one of the host's RoCE devices. But if a SMC-R connection cannot be established, e.g., because no matching pnet table entry is found, the current implementation uses a zero value in the CLC decline message although the host's peer ID is set to a proper value. If no RoCE and no ISM device is usable for a connection, there is no LGR and the LGR check in smc_clc_send_decline() prevents that the peer ID is copied into the CLC decline message for both SMC-D and SMC-R. So, this patch modifies the check to also accept the case of no LGR. Also, only a valid peer ID is copied into the decline message. Signed-off-by: Hans Wippel <ndev@hwipl.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-02-18net/smc: simplify normal link terminationKarsten Graul1-1/+1
smc_lgr_terminate() and smc_lgr_terminate_sched() both result in soft link termination, smc_lgr_terminate_sched() is scheduling a worker for this task. Take out complexity by always using the termination worker and getting rid of smc_lgr_terminate() completely. 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>
2020-02-18net/smc: remove unused parameter of smc_lgr_terminate()Karsten Graul1-1/+1
The soft parameter of smc_lgr_terminate() is not used and obsolete. Remove it. 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>
2020-02-14net/smc: no peer ID in CLC decline for SMCDUrsula Braun1-1/+3
Just SMCR requires a CLC Peer ID, but not SMCD. The field should be zero for SMCD. Fixes: c758dfddc1b5 ("net/smc: add SMC-D support in CLC messages") 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>
2019-11-15net/smc: abnormal termination of SMCD link groupsUrsula Braun1-1/+1
A final cleanup due to SMCD device removal means immediate freeing of all link groups belonging to this device in interrupt context. This patch introduces a separate SMCD link group termination routine, which terminates all link groups of an SMCD device. This new routine smcd_terminate_all ()is reused if the smc module is unloaded. 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>
2019-06-03net: use new in_dev_ifa iteratorsFlorian Westphal1-4/+7
Use in_dev_for_each_ifa_rcu/rtnl instead. This prevents sparse warnings once proper __rcu annotations are added. Signed-off-by: Florian Westphal <fw@strlen.de> t di# Last commands done (6 commands done): Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-12net/smc: consolidate function parametersKarsten Graul1-5/+5
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>
2019-02-02net/smc: fix another sizeof to int comparisonUrsula Braun1-1/+1
Comparing an int to a size, which is unsigned, causes the int to become unsigned, giving the wrong result. kernel_sendmsg can return a negative error code. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-11-24net/smc: short wait for late smc_clc_wait_msgUrsula Braun1-3/+3
After sending one of the initial LLC messages CONFIRM LINK or ADD LINK, there is already a wait for the LLC response. It does not make sense to wait another long time for a CLC DECLINE. Thus this patch introduces a shorter wait time for these cases. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-11-24net/smc: allow fallback after clc timeoutsUrsula Braun1-2/+7
If connection initialization fails for the LLC CONFIRM LINK or the LLC ADD LINK step, fallback to TCP should be enabled. Thus the negative return code -EAGAIN should switch to a positive timeout reason code in these cases, and the internal CLC socket should not have a set sk_err. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-11-24net/smc: remove sock_error detour in clc-functionsUrsula Braun1-13/+5
There is no need to store the return value in sk_err, if it is afterwards cleared again with sock_error(). This patch sets the return value directly. Just cleanup, no functional change. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-10-24iov_iter: Separate type from direction and use accessor functionsDavid Howells1-2/+2
In the iov_iter struct, separate the iterator type from the iterator direction and use accessor functions to access them in most places. Convert a bunch of places to use switch-statements to access them rather then chains of bitwise-AND statements. This makes it easier to add further iterator types. Also, this can be more efficient as to implement a switch of small contiguous integers, the compiler can use ~50% fewer compare instructions than it has to use bitwise-and instructions. Further, cease passing the iterator type into the iterator setup function. The iterator function can set that itself. Only the direction is required. Signed-off-by: David Howells <dhowells@redhat.com>
2018-09-19net/smc: fix sizeof to int comparisonYueHaibing1-8/+6
Comparing an int to a size, which is unsigned, causes the int to become unsigned, giving the wrong result. kernel_sendmsg can return a negative error code. Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-26net/smc: provide fallback reason codeKarsten Graul1-1/+5
Remember the fallback reason code and the peer diagnosis code for smc sockets, and provide them in smc_diag.c to the netlink interface. And add more detailed reason codes. 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>
2018-07-26net/smc: use correct vlan gid of RoCE deviceUrsula Braun1-6/+4
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>
2018-07-21Merge ra.kernel.org:/pub/scm/linux/kernel/git/torvalds/linuxDavid S. Miller1-1/+2
All conflicts were trivial overlapping changes, so reasonably easy to resolve. Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-18net/smc: reset recv timeout after clc handshakeKarsten Graul1-1/+2
During clc handshake the receive timeout is set to CLC_WAIT_TIME. Remember and reset the original timeout value after the receive calls, and remove a duplicate assignment of CLC_WAIT_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>
2018-06-30net/smc: add SMC-D support in CLC messagesHans Wippel1-56/+137
There are two types of SMC: SMC-R and SMC-D. These types are signaled within the CLC messages during the CLC handshake. This patch adds support for and checks of the SMC type. Also, SMC-R and SMC-D need to exchange different information during the CLC handshake. So, this patch extends the current message formats to support the SMC-D header fields. The Proposal message can contain both SMC-R and SMC-D information. The Accept and Confirm messages contain either SMC-R or SMC-D information. 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>
2018-05-18net/smc: rename connection index to RMBE indexHans Wippel1-2/+2
The connection index is actually a RMBE index. So, this patch changes the name 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>
2018-05-16net/smc: check for pending terminationKarsten Graul1-1/+1
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>
2018-04-02Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller1-1/+1
Minor conflicts in drivers/net/ethernet/mellanox/mlx5/core/en_rep.c, we had some overlapping changes: 1) In 'net' MLX5E_PARAMS_LOG_{SQ,RQ}_SIZE --> MLX5E_REP_PARAMS_LOG_{SQ,RQ}_SIZE 2) In 'net-next' params->log_rq_size is renamed to be params->log_rq_mtu_frames. 3) In 'net-next' params->hard_mtu is added. Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-27net/smc: use announced length in sock_recvmsg()Ursula Braun1-1/+1
Not every CLC proposal message needs the maximum buffer length. Due to the MSG_WAITALL flag, it is important to use the peeked real length when receiving the message. Fixes: d63d271ce2b5ce ("smc: switch to sock_recvmsg()") Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-16net/smc: add ipv6 support to CLC layerKarsten Graul1-14/+95
The CLC layer is updated to support ipv6 proposal messages from peers and to match incoming proposal messages against the ipv6 addresses of the net device. struct smc_clc_ipv6_prefix is updated to provide the space for an ipv6 address (struct was not used before). SMC_CLC_MAX_LEN is updated to include the size of the proposal prefix. Existing code in net is not affected, the previous SMC_CLC_MAX_LEN value is large enough to hold ipv4 proposal 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>
2018-03-16net/smc: restructure netinfo for CLC proposal msgsKarsten Graul1-23/+77
Introduce functions smc_clc_prfx_set to retrieve IP information for the CLC proposal msg and smc_clc_prfx_match to match the contents of a proposal message against the IP addresses of the net device. The new functions replace the functionality provided by smc_clc_netinfo_by_tcpsk, which is removed by this patch. The match functionality is extended to scan all ipv4 addresses of the net device for a match against the ipv4 subnet from the proposal msg. 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: move netinfo function to file smc_clc.cKarsten Graul1-2/+42
The function smc_netinfo_by_tcpsk() belongs to CLC handling. Move it to smc_clc.c and rename to smc_clc_netinfo_by_tcpsk. 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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