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| author | Karsten Graul <kgraul@linux.ibm.com> | 2018-05-02 16:56:44 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-05-02 13:29:12 -0400 |
| commit | 877ae5be421de3173b1306113c3f88003ae798b3 (patch) | |
| tree | c223eeb664b494475bbd1671c14ce060a5fffded /net/smc/smc_llc.c | |
| parent | e90c1a1090cccf833080b512746f24667985ed73 (diff) | |
| download | linux-877ae5be421de3173b1306113c3f88003ae798b3.tar.gz | |
net/smc: periodic testlink support
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>
Diffstat (limited to 'net/smc/smc_llc.c')
| -rw-r--r-- | net/smc/smc_llc.c | 62 |
1 files changed, 61 insertions, 1 deletions
diff --git a/net/smc/smc_llc.c b/net/smc/smc_llc.c index ea4b21981b4b..33b4d856f4c6 100644 --- a/net/smc/smc_llc.c +++ b/net/smc/smc_llc.c @@ -397,7 +397,8 @@ static void smc_llc_rx_test_link(struct smc_link *link, struct smc_llc_msg_test_link *llc) { if (llc->hd.flags & SMC_LLC_FLAG_RESP) { - /* unused as long as we don't send this type of msg */ + if (link->state == SMC_LNK_ACTIVE) + complete(&link->llc_testlink_resp); } else { smc_llc_send_test_link(link, llc->user_data, SMC_LLC_RESP); } @@ -502,6 +503,65 @@ static void smc_llc_rx_handler(struct ib_wc *wc, void *buf) } } +/***************************** worker ****************************************/ + +static void smc_llc_testlink_work(struct work_struct *work) +{ + struct smc_link *link = container_of(to_delayed_work(work), + struct smc_link, llc_testlink_wrk); + unsigned long next_interval; + struct smc_link_group *lgr; + unsigned long expire_time; + u8 user_data[16] = { 0 }; + int rc; + + lgr = container_of(link, struct smc_link_group, lnk[SMC_SINGLE_LINK]); + if (link->state != SMC_LNK_ACTIVE) + return; /* don't reschedule worker */ + expire_time = link->wr_rx_tstamp + link->llc_testlink_time; + if (time_is_after_jiffies(expire_time)) { + next_interval = expire_time - jiffies; + goto out; + } + reinit_completion(&link->llc_testlink_resp); + smc_llc_send_test_link(link, user_data, SMC_LLC_REQ); + /* receive TEST LINK response over RoCE fabric */ + rc = wait_for_completion_interruptible_timeout(&link->llc_testlink_resp, + SMC_LLC_WAIT_TIME); + if (rc <= 0) { + smc_lgr_terminate(lgr); + return; + } + next_interval = link->llc_testlink_time; +out: + schedule_delayed_work(&link->llc_testlink_wrk, next_interval); +} + +void smc_llc_link_active(struct smc_link *link, int testlink_time) +{ + init_completion(&link->llc_testlink_resp); + INIT_DELAYED_WORK(&link->llc_testlink_wrk, smc_llc_testlink_work); + link->state = SMC_LNK_ACTIVE; + if (testlink_time) { + link->llc_testlink_time = testlink_time * HZ; + schedule_delayed_work(&link->llc_testlink_wrk, + link->llc_testlink_time); + } +} + +/* called in tasklet context */ +void smc_llc_link_inactive(struct smc_link *link) +{ + link->state = SMC_LNK_INACTIVE; + cancel_delayed_work(&link->llc_testlink_wrk); +} + +/* called in worker context */ +void smc_llc_link_flush(struct smc_link *link) +{ + cancel_delayed_work_sync(&link->llc_testlink_wrk); +} + /***************************** init, exit, misc ******************************/ static struct smc_wr_rx_handler smc_llc_rx_handlers[] = { |