diff options
| author | Karsten Graul <kgraul@linux.ibm.com> | 2020-04-30 16:55:38 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-04-30 22:44:33 +0300 |
| commit | 555da9af827d95134656fa459c8f3ece04dd867a (patch) | |
| tree | f2d35cfc1e42ad9d560cbc09855e8365240586c2 /net/smc/smc_core.h | |
| parent | 1569a3c44303834680e93df2ecf60f356be9b322 (diff) | |
| download | linux-555da9af827d95134656fa459c8f3ece04dd867a.tar.xz | |
net/smc: add event-based llc_flow framework
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>
Diffstat (limited to 'net/smc/smc_core.h')
| -rw-r--r-- | net/smc/smc_core.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h index b5781511063d..70399217ad6f 100644 --- a/net/smc/smc_core.h +++ b/net/smc/smc_core.h @@ -197,6 +197,20 @@ struct smc_rtoken { /* address/key of remote RMB */ struct smcd_dev; +enum smc_llc_flowtype { + SMC_LLC_FLOW_NONE = 0, + SMC_LLC_FLOW_ADD_LINK = 2, + SMC_LLC_FLOW_DEL_LINK = 4, + SMC_LLC_FLOW_RKEY = 6, +}; + +struct smc_llc_qentry; + +struct smc_llc_flow { + enum smc_llc_flowtype type; + struct smc_llc_qentry *qentry; +}; + struct smc_link_group { struct list_head list; struct rb_root conns_all; /* connection tree */ @@ -238,6 +252,16 @@ struct smc_link_group { /* protects llc_event_q */ struct work_struct llc_event_work; /* llc event worker */ + wait_queue_head_t llc_waiter; + /* w4 next llc event */ + struct smc_llc_flow llc_flow_lcl; + /* llc local control field */ + struct smc_llc_flow llc_flow_rmt; + /* llc remote control field */ + struct smc_llc_qentry *delayed_event; + /* arrived when flow active */ + spinlock_t llc_flow_lock; + /* protects llc flow */ int llc_testlink_time; /* link keep alive time */ }; |