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BranchCommit messageAuthorAge
archive/unc-master-3.0P-FP: fix BUG_ON releated to priority inheritanceBjoern Brandenburg13 years
archived-2013.1uncachedev: mmap memory that is not cached by CPUsGlenn Elliott12 years
archived-private-masterMerge branch 'wip-2.6.34' into old-private-masterAndrea Bastoni15 years
archived-semi-partMerge branch 'wip-semi-part' of ssh://cvs/cvs/proj/litmus/repo/litmus2010 int...Andrea Bastoni15 years
demoFurther refinementsJonathan Herman14 years
ecrts-pgm-finalMerge branch 'wip-ecrts14-pgm' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus-r...Glenn Elliott12 years
ecrts14-pgm-finalMerge branch 'wip-ecrts14-pgm' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus-r...Glenn Elliott12 years
gpusync-rtss12Final GPUSync implementation.Glenn Elliott12 years
gpusync/stagingRename IKGLP R2DGLP.Glenn Elliott12 years
linux-tipMerge branch 'slab/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/p...Linus Torvalds15 years
litmus2008-patch-seriesadd i386 feather-trace implementationBjoern B. Brandenburg16 years
masterPSN-EDF: use inferred_sporadic_job_release_atBjoern Brandenburg9 years
pgmmake it compileGlenn Elliott12 years
prop/litmus-signalsInfrastructure for Litmus signals.Glenn Elliott13 years
prop/robust-tie-breakFixed bug in edf_higher_prio().Glenn Elliott13 years
stagingFix tracepoint compilation errorFelipe Cerqueira13 years
test9/23/2016Namhoon Kim9 years
tracing-develTest kernel tracing events capabilitiesAndrea Bastoni16 years
v2.6.34-with-arm-patchessmsc911x: Add spinlocks around registers accessCatalin Marinas15 years
v2015.1Add ARM syscall def for get_current_budgetBjoern Brandenburg10 years
wip-2011.2-bbbLitmus core: simplify np-section protocolBjoern B. Brandenburg14 years
wip-2011.2-bbb-traceRefactor sched_trace_log_message() -> debug_trace_log_message()Andrea Bastoni14 years
wip-2012.3-gpuSOBLIV draining support for C-EDF.Glenn Elliott12 years
wip-2012.3-gpu-preportpick up last C-RM fileGlenn Elliott12 years
wip-2012.3-gpu-rtss13Fix critical bug in GPU tracker.Glenn Elliott12 years
wip-2012.3-gpu-sobliv-budget-w-ksharkProper sobliv draining and many bug fixes.Glenn Elliott12 years
wip-aedzl-finalMake it easier to compile AEDZL interfaces in liblitmus.Glenn Elliott15 years
wip-aedzl-revisedAdd sched_trace data for Apative EDZLGlenn Elliott15 years
wip-arbit-deadlineFix compilation bug.Glenn Elliott13 years
wip-aux-tasksDescription of refined aux task inheritance.Glenn Elliott13 years
wip-bbbGSN-EDF & Core: improve debug TRACE'ing for NP sectionsBjoern B. Brandenburg14 years
wip-bbb-prio-donuse correct timestampBjoern B. Brandenburg14 years
wip-better-breakImplement hash-based EDF tie-breaking.Glenn Elliott13 years
wip-binary-heapMake C-EDF work with simplified binheap_deleteGlenn Elliott13 years
wip-budgetAdded support for choices in budget policy enforcement.Glenn Elliott15 years
wip-colorSummarize schedulability with final recordJonathan Herman13 years
wip-color-jlhsched_color: Fixed two bugs causing crashing on experiment restart and a rare...Jonathan Herman13 years
wip-d10-hz1000Enable HZ=1000 on District 10Bjoern B. Brandenburg15 years
wip-default-clusteringFeature: Make default C-EDF clustering compile-time configurable.Glenn Elliott15 years
wip-dissipation-jericksoUpdate from 2.6.36 to 2.6.36.4Jeremy Erickson11 years
wip-dissipation2-jericksoUpdate 2.6.36 to 2.6.36.4Jeremy Erickson11 years
wip-ecrts14-pgmMerge branch 'wip-ecrts14-pgm' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus-r...Glenn Elliott12 years
wip-edf-hsblast tested versionJonathan Herman14 years
wip-edf-osLookup table EDF-osJeremy Erickson12 years
wip-edf-tie-breakMerge branch 'wip-edf-tie-break' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus...Glenn Elliott13 years
wip-edzl-critiqueUse hr_timer's active checks instead of having own flag.Glenn Elliott15 years
wip-edzl-finalImplementation of the EDZL scheduler.Glenn Elliott15 years
wip-edzl-revisedClean up comments.Glenn Elliott15 years
wip-eventsAdded support for tracing arbitrary actions.Jonathan Herman15 years
wip-extra-debugDBG: add additional tracingBjoern B. Brandenburg15 years
wip-fix-switch-jericksoAttempt to fix race condition with plugin switchingJeremy Erickson15 years
wip-fix3sched: show length of runqueue clock deactivation in /proc/sched_debugBjoern B. Brandenburg15 years
wip-fmlp-dequeueImprove FMLP queue management.Glenn Elliott14 years
wip-ft-irq-flagFeather-Trace: keep track of interrupt-related interference.Bjoern B. Brandenburg14 years
wip-gpu-cleanupEnable sched_trace log injection from userspaceGlenn Elliott13 years
wip-gpu-interruptsRemove option for threading of all softirqs.Glenn Elliott14 years
wip-gpu-rtas12Generalized GPU cost predictors + EWMA. (untested)Glenn Elliott13 years
wip-gpu-rtss12Final GPUSync implementation.Glenn Elliott13 years
wip-gpu-rtss12-srpexperimental changes to support GPUs under SRPGlenn Elliott13 years
wip-gpusync-mergeCleanup priority tracking for budget enforcement.Glenn Elliott11 years
wip-ikglpMove RSM and IKGLP imp. to own .c filesGlenn Elliott13 years
wip-k-fmlpMerge branch 'mpi-master' into wip-k-fmlpGlenn Elliott14 years
wip-kernel-coloringAdded recolor syscallNamhoon Kim7 years
wip-kernthreadsKludge work-queue processing into klitirqd.Glenn Elliott15 years
wip-klmirqd-to-auxAllow klmirqd threads to be given names.Glenn Elliott13 years
wip-ksharkMerge branch 'mpi-staging' into wip-ksharkJonathan Herman13 years
wip-litmus-3.2Merge commit 'v3.2' into litmus-stagingAndrea Bastoni13 years
wip-litmus2011.2Cleanup: Coding conformance for affinity stuff.Glenn Elliott14 years
wip-litmus3.0-2011.2Feather-Trace: keep track of interrupt-related interference.Bjoern B. Brandenburg14 years
wip-master-2.6.33-rtAvoid deadlock when switching task policy to BACKGROUND (ugly)Andrea Bastoni15 years
wip-mcRemoved ARM-specific hacks which disabled less common mixed-criticality featu...Jonathan Herman12 years
wip-mc-bipasaMC-EDF addedbipasa chattopadhyay13 years
wip-mc-jericksoSplit C/D queuesJeremy Erickson15 years
wip-mc2-cache-slackManually patched mc^2 related codeMing Yang10 years
wip-mcrit-maccosmeticMac Mollison15 years
wip-merge-3.0Prevent Linux to send IPI and queue tasks on remote CPUs.Andrea Bastoni14 years
wip-merge-v3.0Prevent Linux to send IPI and queue tasks on remote CPUs.Andrea Bastoni14 years
wip-migration-affinityNULL affinity dereference in C-EDF.Glenn Elliott14 years
wip-mmap-uncacheshare branch with othersGlenn Elliott13 years
wip-modechangeRTSS 2017 submissionNamhoon Kim8 years
wip-nested-lockingAppears to be working.Bryan Ward12 years
wip-omlp-gedfFirst implementation of G-OMLP.Glenn Elliott15 years
wip-paiSome cleanup of PAIGlenn Elliott14 years
wip-percore-lib9/21/2016Namhoon Kim9 years
wip-performanceCONFIG_DONT_PREEMPT_ON_TIE: Don't preeempt a scheduled task on priority tie.Glenn Elliott14 years
wip-pgmAdd PGM support to C-FLGlenn Elliott12 years
wip-pgm-splitFirst draft of C-FL-splitNamhoon Kim12 years
wip-pm-ovdAdd preemption-and-migration overhead tracing supportAndrea Bastoni15 years
wip-prio-inhP-EDF updated to use the generic pi framework.Glenn Elliott15 years
wip-prioq-dglBUG FIX: Support DGLs with PRIOQ_MUTEXGlenn Elliott13 years
wip-refactored-gedfGeneralizd architecture for GEDF-style scheduelrs to reduce code redundancy.Glenn Elliott15 years
wip-release-master-fixbugfix: release master CPU must signal task was pickedBjoern B. Brandenburg14 years
wip-robust-tie-breakEDF priority tie-breaks.Glenn Elliott13 years
wip-rt-ksharkMove task time accounting into the complete_job method.Jonathan Herman13 years
wip-rtas12-pgmScheduling of PGM jobs.Glenn Elliott13 years
wip-semi-partFix compile error with newer GCCJeremy Erickson12 years
wip-semi-part-edfos-jericksoUse initial CPU set by clientJeremy Erickson12 years
wip-shared-libTODO: Fix condition checks in replicate_page_move_mapping()Namhoon Kim9 years
wip-shared-lib2RTAS 2017 Submission ver.Namhoon Kim9 years
wip-shared-memInitial commit for shared libraryNamhoon Kim9 years
wip-splitting-jericksoFix release behaviorJeremy Erickson13 years
wip-splitting-omlp-jericksoBjoern's Dissertation Code with Priority DonationJeremy Erickson13 years
wip-stage-binheapAn efficient binary heap implementation.Glenn Elliott13 years
wip-sun-portDynamic memory allocation and clean exit for FeatherTraceChristopher Kenna15 years
wip-timer-tracebugfix: C-EDF, clear scheduled field of the correct CPU upon task_exitAndrea Bastoni15 years
wip-tracepointsAdd kernel-style events for sched_trace_XXX() functionsAndrea Bastoni14 years
 
TagDownloadAuthorAge
2015.1commit 8e51b37822...Bjoern Brandenburg10 years
2013.1commit bcaacec1ca...Glenn Elliott12 years
2012.3commit c158b5fbe4...Jonathan Herman13 years
2012.2commit b53c479a0f...Glenn Elliott13 years
2012.1commit 83b11ea1c6...Bjoern B. Brandenburg14 years
rtas12-mc-beta-expcommit 8e236ee20f...Christopher Kenna14 years
2011.1commit d11808b5c6...Christopher Kenna15 years
v2.6.37-rc4commit e8a7e48bb2...Linus Torvalds15 years
v2.6.37-rc3commit 3561d43fd2...Linus Torvalds15 years
v2.6.37-rc2commit e53beacd23...Linus Torvalds15 years
v2.6.37-rc1commit c8ddb2713c...Linus Torvalds15 years
v2.6.36commit f6f94e2ab1...Linus Torvalds15 years
2010.2commit 5c5456402d...Bjoern B. Brandenburg15 years
v2.6.36-rc8commit cd07202cc8...Linus Torvalds15 years
v2.6.36-rc7commit cb655d0f3d...Linus Torvalds15 years
v2.6.36-rc6commit 899611ee7d...Linus Torvalds15 years
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2010.1commit 7c1ff4c544...Andrea Bastoni15 years
v2.6.34commit e40152ee1e...Linus Torvalds15 years
v2.6.33.4commit 4640b4e7d9...Greg Kroah-Hartman15 years
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v2.6.15-rc3commit 624f54be20...Linus Torvalds20 years
v2.6.15-rc2commit 3bedff1d73...Linus Torvalds20 years
v2.6.15-rc1commit cd52d1ee9a...Linus Torvalds20 years
v2.6.14commit 741b2252a5...Linus Torvalds20 years
v2.6.14-rc5commit 93918e9afc...Linus Torvalds20 years
v2.6.14-rc4commit 907a426179...Linus Torvalds20 years
v2.6.14-rc3commit 1c9426e8a5...Linus Torvalds20 years
v2.6.14-rc2commit 676d55ae30...Linus Torvalds20 years
v2.6.14-rc1commit 2f4ba45a75...Linus Torvalds20 years
v2.6.13commit 02b3e4e2d7...Linus Torvalds20 years
v2.6.13-rc7commit 0572e3da3f...Linus Torvalds20 years
v2.6.13-rc6commit 6fc32179de...Linus Torvalds20 years
v2.6.13-rc5commit 9a351e30d7...Linus Torvalds20 years
v2.6.13-rc4commit 6395352334...Linus Torvalds20 years
v2.6.11tree c39ae07f39...
v2.6.11-treetree c39ae07f39...
v2.6.12commit 9ee1c939d1...
v2.6.12-rc2commit 1da177e4c3...
v2.6.12-rc3commit a2755a80f4...
v2.6.12-rc4commit 88d7bd8cb9...
v2.6.12-rc5commit 2a24ab628a...
v2.6.12-rc6commit 7cef5677ef...
v2.6.13-rc1commit 4c91aedb75...
v2.6.13-rc2commit a18bcb7450...
v2.6.13-rc3commit c32511e271...
ass="hl opt">, CH_EVENT_UC_TXPARITY, CH_EVENT_UC_HWFAIL, CH_EVENT_UC_RXPARITY, CH_EVENT_UC_ZERO, CH_EVENT_UC_UNKNOWN, /** * Events, representing subchannel-check */ CH_EVENT_SC_UNKNOWN, /** * Events, representing machine checks */ CH_EVENT_MC_FAIL, CH_EVENT_MC_GOOD, /** * Event, representing normal IRQ */ CH_EVENT_IRQ, CH_EVENT_FINSTAT, /** * Event, representing timer expiry. */ CH_EVENT_TIMER, /** * Events, representing commands from upper levels. */ CH_EVENT_START, CH_EVENT_STOP, /** * MUST be always the last element!! */ NR_CH_EVENTS, }; /** * States of the channel statemachine. */ enum ch_states { /** * Channel not assigned to any device, * initial state, direction invalid */ CH_STATE_IDLE, /** * Channel assigned but not operating */ CH_STATE_STOPPED, CH_STATE_STARTWAIT, CH_STATE_STARTRETRY, CH_STATE_SETUPWAIT, CH_STATE_RXINIT, CH_STATE_TXINIT, CH_STATE_RX, CH_STATE_TX, CH_STATE_RXIDLE, CH_STATE_TXIDLE, CH_STATE_RXERR, CH_STATE_TXERR, CH_STATE_TERM, CH_STATE_DTERM, CH_STATE_NOTOP, /** * MUST be always the last element!! */ NR_CH_STATES, }; static int loglevel = CTC_LOGLEVEL_DEFAULT; /** * Linked list of all detected channels. */ static struct channel *channels = NULL; /** * Print Banner. */ static void print_banner(void) { static int printed = 0; char vbuf[] = "$Revision: 1.78 $"; char *version = vbuf; if (printed) return; if ((version = strchr(version, ':'))) { char *p = strchr(version + 1, '$'); if (p) *p = '\0'; } else version = " ??? "; printk(KERN_INFO "CTC driver Version%s" #ifdef DEBUG " (DEBUG-VERSION, " __DATE__ __TIME__ ")" #endif " initialized\n", version); printed = 1; } /** * Return type of a detected device. */ static enum channel_types get_channel_type(struct ccw_device_id *id) { enum channel_types type = (enum channel_types) id->driver_info; if (type == channel_type_ficon) type = channel_type_escon; return type; } static const char *ch_event_names[] = { "ccw_device success", "ccw_device busy", "ccw_device enodev", "ccw_device ioerr", "ccw_device unknown", "Status ATTN & BUSY", "Status ATTN", "Status BUSY", "Unit check remote reset", "Unit check remote system reset", "Unit check TX timeout", "Unit check TX parity", "Unit check Hardware failure", "Unit check RX parity", "Unit check ZERO", "Unit check Unknown", "SubChannel check Unknown", "Machine check failure", "Machine check operational", "IRQ normal", "IRQ final", "Timer", "Start", "Stop", }; static const char *ch_state_names[] = { "Idle", "Stopped", "StartWait", "StartRetry", "SetupWait", "RX init", "TX init", "RX", "TX", "RX idle", "TX idle", "RX error", "TX error", "Terminating", "Restarting", "Not operational", }; #ifdef DEBUG /** * Dump header and first 16 bytes of an sk_buff for debugging purposes. * * @param skb The sk_buff to dump. * @param offset Offset relative to skb-data, where to start the dump. */ static void ctc_dump_skb(struct sk_buff *skb, int offset) { unsigned char *p = skb->data; __u16 bl; struct ll_header *header; int i; if (!(loglevel & CTC_LOGLEVEL_DEBUG)) return; p += offset; bl = *((__u16 *) p); p += 2; header = (struct ll_header *) p; p -= 2; printk(KERN_DEBUG "dump:\n"); printk(KERN_DEBUG "blocklen=%d %04x\n", bl, bl); printk(KERN_DEBUG "h->length=%d %04x\n", header->length, header->length); printk(KERN_DEBUG "h->type=%04x\n", header->type); printk(KERN_DEBUG "h->unused=%04x\n", header->unused); if (bl > 16) bl = 16; printk(KERN_DEBUG "data: "); for (i = 0; i < bl; i++) printk("%02x%s", *p++, (i % 16) ? " " : "\n<7>"); printk("\n"); } #else static inline void ctc_dump_skb(struct sk_buff *skb, int offset) { } #endif /** * Unpack a just received skb and hand it over to * upper layers. * * @param ch The channel where this skb has been received. * @param pskb The received skb. */ static __inline__ void ctc_unpack_skb(struct channel *ch, struct sk_buff *pskb) { struct net_device *dev = ch->netdev; struct ctc_priv *privptr = (struct ctc_priv *) dev->priv; __u16 len = *((__u16 *) pskb->data); DBF_TEXT(trace, 4, __FUNCTION__); skb_put(pskb, 2 + LL_HEADER_LENGTH); skb_pull(pskb, 2); pskb->dev = dev; pskb->ip_summed = CHECKSUM_UNNECESSARY; while (len > 0) { struct sk_buff *skb; struct ll_header *header = (struct ll_header *) pskb->data; skb_pull(pskb, LL_HEADER_LENGTH); if ((ch->protocol == CTC_PROTO_S390) && (header->type != ETH_P_IP)) { #ifndef DEBUG if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) { #endif /** * Check packet type only if we stick strictly * to S/390's protocol of OS390. This only * supports IP. Otherwise allow any packet * type. */ ctc_pr_warn( "%s Illegal packet type 0x%04x received, dropping\n", dev->name, header->type); ch->logflags |= LOG_FLAG_ILLEGALPKT; #ifndef DEBUG } #endif #ifdef DEBUG ctc_dump_skb(pskb, -6); #endif privptr->stats.rx_dropped++; privptr->stats.rx_frame_errors++; return; } pskb->protocol = ntohs(header->type); if (header->length <= LL_HEADER_LENGTH) { #ifndef DEBUG if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) { #endif ctc_pr_warn( "%s Illegal packet size %d " "received (MTU=%d blocklen=%d), " "dropping\n", dev->name, header->length, dev->mtu, len); ch->logflags |= LOG_FLAG_ILLEGALSIZE; #ifndef DEBUG } #endif #ifdef DEBUG ctc_dump_skb(pskb, -6); #endif privptr->stats.rx_dropped++; privptr->stats.rx_length_errors++; return; } header->length -= LL_HEADER_LENGTH; len -= LL_HEADER_LENGTH; if ((header->length > skb_tailroom(pskb)) || (header->length > len)) { #ifndef DEBUG if (!(ch->logflags & LOG_FLAG_OVERRUN)) { #endif ctc_pr_warn( "%s Illegal packet size %d " "(beyond the end of received data), " "dropping\n", dev->name, header->length); ch->logflags |= LOG_FLAG_OVERRUN; #ifndef DEBUG } #endif #ifdef DEBUG ctc_dump_skb(pskb, -6); #endif privptr->stats.rx_dropped++; privptr->stats.rx_length_errors++; return; } skb_put(pskb, header->length); pskb->mac.raw = pskb->data; len -= header->length; skb = dev_alloc_skb(pskb->len); if (!skb) { #ifndef DEBUG if (!(ch->logflags & LOG_FLAG_NOMEM)) { #endif ctc_pr_warn( "%s Out of memory in ctc_unpack_skb\n", dev->name); ch->logflags |= LOG_FLAG_NOMEM; #ifndef DEBUG } #endif privptr->stats.rx_dropped++; return; } memcpy(skb_put(skb, pskb->len), pskb->data, pskb->len); skb->mac.raw = skb->data; skb->dev = pskb->dev; skb->protocol = pskb->protocol; pskb->ip_summed = CHECKSUM_UNNECESSARY; if (ch->protocol == CTC_PROTO_LINUX_TTY) ctc_tty_netif_rx(skb); else netif_rx_ni(skb); /** * Successful rx; reset logflags */ ch->logflags = 0; dev->last_rx = jiffies; privptr->stats.rx_packets++; privptr->stats.rx_bytes += skb->len; if (len > 0) { skb_pull(pskb, header->length); if (skb_tailroom(pskb) < LL_HEADER_LENGTH) { #ifndef DEBUG if (!(ch->logflags & LOG_FLAG_OVERRUN)) { #endif ctc_pr_warn( "%s Overrun in ctc_unpack_skb\n", dev->name); ch->logflags |= LOG_FLAG_OVERRUN; #ifndef DEBUG } #endif return; } skb_put(pskb, LL_HEADER_LENGTH); } } } /** * Check return code of a preceeding ccw_device call, halt_IO etc... * * @param ch The channel, the error belongs to. * @param return_code The error code to inspect. */ static void inline ccw_check_return_code(struct channel *ch, int return_code, char *msg) { DBF_TEXT(trace, 5, __FUNCTION__); switch (return_code) { case 0: fsm_event(ch->fsm, CH_EVENT_IO_SUCCESS, ch); break; case -EBUSY: ctc_pr_warn("%s (%s): Busy !\n", ch->id, msg); fsm_event(ch->fsm, CH_EVENT_IO_EBUSY, ch); break; case -ENODEV: ctc_pr_emerg("%s (%s): Invalid device called for IO\n", ch->id, msg); fsm_event(ch->fsm, CH_EVENT_IO_ENODEV, ch); break; case -EIO: ctc_pr_emerg("%s (%s): Status pending... \n", ch->id, msg); fsm_event(ch->fsm, CH_EVENT_IO_EIO, ch); break; default: ctc_pr_emerg("%s (%s): Unknown error in do_IO %04x\n", ch->id, msg, return_code); fsm_event(ch->fsm, CH_EVENT_IO_UNKNOWN, ch); } } /** * Check sense of a unit check. * * @param ch The channel, the sense code belongs to. * @param sense The sense code to inspect. */ static void inline ccw_unit_check(struct channel *ch, unsigned char sense) { DBF_TEXT(trace, 5, __FUNCTION__); if (sense & SNS0_INTERVENTION_REQ) { if (sense & 0x01) { if (ch->protocol != CTC_PROTO_LINUX_TTY) ctc_pr_debug("%s: Interface disc. or Sel. reset " "(remote)\n", ch->id); fsm_event(ch->fsm, CH_EVENT_UC_RCRESET, ch); } else { ctc_pr_debug("%s: System reset (remote)\n", ch->id); fsm_event(ch->fsm, CH_EVENT_UC_RSRESET, ch); } } else if (sense & SNS0_EQUIPMENT_CHECK) { if (sense & SNS0_BUS_OUT_CHECK) { ctc_pr_warn("%s: Hardware malfunction (remote)\n", ch->id); fsm_event(ch->fsm, CH_EVENT_UC_HWFAIL, ch); } else { ctc_pr_warn("%s: Read-data parity error (remote)\n", ch->id); fsm_event(ch->fsm, CH_EVENT_UC_RXPARITY, ch); } } else if (sense & SNS0_BUS_OUT_CHECK) { if (sense & 0x04) { ctc_pr_warn("%s: Data-streaming timeout)\n", ch->id); fsm_event(ch->fsm, CH_EVENT_UC_TXTIMEOUT, ch); } else { ctc_pr_warn("%s: Data-transfer parity error\n", ch->id); fsm_event(ch->fsm, CH_EVENT_UC_TXPARITY, ch); } } else if (sense & SNS0_CMD_REJECT) { ctc_pr_warn("%s: Command reject\n", ch->id); } else if (sense == 0) { ctc_pr_debug("%s: Unit check ZERO\n", ch->id); fsm_event(ch->fsm, CH_EVENT_UC_ZERO, ch); } else { ctc_pr_warn("%s: Unit Check with sense code: %02x\n", ch->id, sense); fsm_event(ch->fsm, CH_EVENT_UC_UNKNOWN, ch); } } static void ctc_purge_skb_queue(struct sk_buff_head *q) { struct sk_buff *skb; DBF_TEXT(trace, 5, __FUNCTION__); while ((skb = skb_dequeue(q))) { atomic_dec(&skb->users); dev_kfree_skb_irq(skb); } } static __inline__ int ctc_checkalloc_buffer(struct channel *ch, int warn) { DBF_TEXT(trace, 5, __FUNCTION__); if ((ch->trans_skb == NULL) || (ch->flags & CHANNEL_FLAGS_BUFSIZE_CHANGED)) { if (ch->trans_skb != NULL) dev_kfree_skb(ch->trans_skb); clear_normalized_cda(&ch->ccw[1]); ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA); if (ch->trans_skb == NULL) { if (warn) ctc_pr_warn( "%s: Couldn't alloc %s trans_skb\n", ch->id, (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); return -ENOMEM; } ch->ccw[1].count = ch->max_bufsize; if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) { dev_kfree_skb(ch->trans_skb); ch->trans_skb = NULL; if (warn) ctc_pr_warn( "%s: set_normalized_cda for %s " "trans_skb failed, dropping packets\n", ch->id, (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); return -ENOMEM; } ch->ccw[1].count = 0; ch->trans_skb_data = ch->trans_skb->data; ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED; } return 0; } /** * Dummy NOP action for statemachines */ static void fsm_action_nop(fsm_instance * fi, int event, void *arg) { } /** * Actions for channel - statemachines. *****************************************************************************/ /** * Normal data has been send. Free the corresponding * skb (it's in io_queue), reset dev->tbusy and * revert to idle state. * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_txdone(fsm_instance * fi, int event, void *arg) { struct channel *ch = (struct channel *) arg; struct net_device *dev = ch->netdev; struct ctc_priv *privptr = dev->priv; struct sk_buff *skb; int first = 1; int i; unsigned long duration; struct timespec done_stamp = xtime; DBF_TEXT(trace, 4, __FUNCTION__); duration = (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 + (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000; if (duration > ch->prof.tx_time) ch->prof.tx_time = duration; if (ch->irb->scsw.count != 0) ctc_pr_debug("%s: TX not complete, remaining %d bytes\n", dev->name, ch->irb->scsw.count); fsm_deltimer(&ch->timer); while ((skb = skb_dequeue(&ch->io_queue))) { privptr->stats.tx_packets++; privptr->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; if (first) { privptr->stats.tx_bytes += 2; first = 0; } atomic_dec(&skb->users); dev_kfree_skb_irq(skb); } spin_lock(&ch->collect_lock); clear_normalized_cda(&ch->ccw[4]); if (ch->collect_len > 0) { int rc; if (ctc_checkalloc_buffer(ch, 1)) { spin_unlock(&ch->collect_lock); return; } ch->trans_skb->tail = ch->trans_skb->data = ch->trans_skb_data; ch->trans_skb->len = 0; if (ch->prof.maxmulti < (ch->collect_len + 2)) ch->prof.maxmulti = ch->collect_len + 2; if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue)) ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue); *((__u16 *) skb_put(ch->trans_skb, 2)) = ch->collect_len + 2; i = 0; while ((skb = skb_dequeue(&ch->collect_queue))) { memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len); privptr->stats.tx_packets++; privptr->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; atomic_dec(&skb->users); dev_kfree_skb_irq(skb); i++; } ch->collect_len = 0; spin_unlock(&ch->collect_lock); ch->ccw[1].count = ch->trans_skb->len; fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); ch->prof.send_stamp = xtime; rc = ccw_device_start(ch->cdev, &ch->ccw[0], (unsigned long) ch, 0xff, 0); ch->prof.doios_multi++; if (rc != 0) { privptr->stats.tx_dropped += i; privptr->stats.tx_errors += i; fsm_deltimer(&ch->timer); ccw_check_return_code(ch, rc, "chained TX"); } } else { spin_unlock(&ch->collect_lock); fsm_newstate(fi, CH_STATE_TXIDLE); } ctc_clear_busy(dev); } /** * Initial data is sent. * Notify device statemachine that we are up and * running. * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_txidle(fsm_instance * fi, int event, void *arg) { struct channel *ch = (struct channel *) arg; DBF_TEXT(trace, 4, __FUNCTION__); fsm_deltimer(&ch->timer); fsm_newstate(fi, CH_STATE_TXIDLE); fsm_event(((struct ctc_priv *) ch->netdev->priv)->fsm, DEV_EVENT_TXUP, ch->netdev); } /** * Got normal data, check for sanity, queue it up, allocate new buffer * trigger bottom half, and initiate next read. * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_rx(fsm_instance * fi, int event, void *arg) { struct channel *ch = (struct channel *) arg; struct net_device *dev = ch->netdev; struct ctc_priv *privptr = dev->priv; int len = ch->max_bufsize - ch->irb->scsw.count; struct sk_buff *skb = ch->trans_skb; __u16 block_len = *((__u16 *) skb->data); int check_len; int rc; DBF_TEXT(trace, 4, __FUNCTION__); fsm_deltimer(&ch->timer); if (len < 8) { ctc_pr_debug("%s: got packet with length %d < 8\n", dev->name, len); privptr->stats.rx_dropped++; privptr->stats.rx_length_errors++; goto again; } if (len > ch->max_bufsize) { ctc_pr_debug("%s: got packet with length %d > %d\n", dev->name, len, ch->max_bufsize); privptr->stats.rx_dropped++; privptr->stats.rx_length_errors++; goto again; } /** * VM TCP seems to have a bug sending 2 trailing bytes of garbage. */ switch (ch->protocol) { case CTC_PROTO_S390: case CTC_PROTO_OS390: check_len = block_len + 2; break; default: check_len = block_len; break; } if ((len < block_len) || (len > check_len)) { ctc_pr_debug("%s: got block length %d != rx length %d\n", dev->name, block_len, len); #ifdef DEBUG ctc_dump_skb(skb, 0); #endif *((__u16 *) skb->data) = len; privptr->stats.rx_dropped++; privptr->stats.rx_length_errors++; goto again; } block_len -= 2; if (block_len > 0) { *((__u16 *) skb->data) = block_len; ctc_unpack_skb(ch, skb); } again: skb->data = skb->tail = ch->trans_skb_data; skb->len = 0; if (ctc_checkalloc_buffer(ch, 1)) return; ch->ccw[1].count = ch->max_bufsize; rc = ccw_device_start(ch->cdev, &ch->ccw[0], (unsigned long) ch, 0xff, 0); if (rc != 0) ccw_check_return_code(ch, rc, "normal RX"); } static void ch_action_rxidle(fsm_instance * fi, int event, void *arg); /** * Initialize connection by sending a __u16 of value 0. * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_firstio(fsm_instance * fi, int event, void *arg) { struct channel *ch = (struct channel *) arg; int rc; DBF_TEXT(trace, 4, __FUNCTION__); if (fsm_getstate(fi) == CH_STATE_TXIDLE) ctc_pr_debug("%s: remote side issued READ?, init ...\n", ch->id); fsm_deltimer(&ch->timer); if (ctc_checkalloc_buffer(ch, 1)) return; if ((fsm_getstate(fi) == CH_STATE_SETUPWAIT) && (ch->protocol == CTC_PROTO_OS390)) { /* OS/390 resp. z/OS */ if (CHANNEL_DIRECTION(ch->flags) == READ) { *((__u16 *) ch->trans_skb->data) = CTC_INITIAL_BLOCKLEN; fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); ch_action_rxidle(fi, event, arg); } else { struct net_device *dev = ch->netdev; fsm_newstate(fi, CH_STATE_TXIDLE); fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_TXUP, dev); } return; } /** * Don´t setup a timer for receiving the initial RX frame * if in compatibility mode, since VM TCP delays the initial * frame until it has some data to send. */ if ((CHANNEL_DIRECTION(ch->flags) == WRITE) || (ch->protocol != CTC_PROTO_S390)) fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); *((__u16 *) ch->trans_skb->data) = CTC_INITIAL_BLOCKLEN; ch->ccw[1].count = 2; /* Transfer only length */ fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == READ) ? CH_STATE_RXINIT : CH_STATE_TXINIT); rc = ccw_device_start(ch->cdev, &ch->ccw[0], (unsigned long) ch, 0xff, 0); if (rc != 0) { fsm_deltimer(&ch->timer); fsm_newstate(fi, CH_STATE_SETUPWAIT); ccw_check_return_code(ch, rc, "init IO"); } /** * If in compatibility mode since we don´t setup a timer, we * also signal RX channel up immediately. This enables us * to send packets early which in turn usually triggers some * reply from VM TCP which brings up the RX channel to it´s * final state. */ if ((CHANNEL_DIRECTION(ch->flags) == READ) && (ch->protocol == CTC_PROTO_S390)) { struct net_device *dev = ch->netdev; fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXUP, dev); } } /** * Got initial data, check it. If OK, * notify device statemachine that we are up and * running. * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_rxidle(fsm_instance * fi, int event, void *arg) { struct channel *ch = (struct channel *) arg; struct net_device *dev = ch->netdev; __u16 buflen; int rc; DBF_TEXT(trace, 4, __FUNCTION__); fsm_deltimer(&ch->timer); buflen = *((__u16 *) ch->trans_skb->data); #ifdef DEBUG ctc_pr_debug("%s: Initial RX count %d\n", dev->name, buflen); #endif if (buflen >= CTC_INITIAL_BLOCKLEN) { if (ctc_checkalloc_buffer(ch, 1)) return; ch->ccw[1].count = ch->max_bufsize; fsm_newstate(fi, CH_STATE_RXIDLE); rc = ccw_device_start(ch->cdev, &ch->ccw[0], (unsigned long) ch, 0xff, 0); if (rc != 0) { fsm_newstate(fi, CH_STATE_RXINIT); ccw_check_return_code(ch, rc, "initial RX"); } else fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXUP, dev); } else { ctc_pr_debug("%s: Initial RX count %d not %d\n", dev->name, buflen, CTC_INITIAL_BLOCKLEN); ch_action_firstio(fi, event, arg); } } /** * Set channel into extended mode. * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_setmode(fsm_instance * fi, int event, void *arg) { struct channel *ch = (struct channel *) arg; int rc; unsigned long saveflags; DBF_TEXT(trace, 4, __FUNCTION__); fsm_deltimer(&ch->timer); fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); fsm_newstate(fi, CH_STATE_SETUPWAIT); saveflags = 0; /* avoids compiler warning with spin_unlock_irqrestore */ if (event == CH_EVENT_TIMER) // only for timer not yet locked spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); rc = ccw_device_start(ch->cdev, &ch->ccw[6], (unsigned long) ch, 0xff, 0); if (event == CH_EVENT_TIMER) spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); if (rc != 0) { fsm_deltimer(&ch->timer); fsm_newstate(fi, CH_STATE_STARTWAIT); ccw_check_return_code(ch, rc, "set Mode"); } else ch->retry = 0; } /** * Setup channel. * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_start(fsm_instance * fi, int event, void *arg) { struct channel *ch = (struct channel *) arg; unsigned long saveflags; int rc; struct net_device *dev; DBF_TEXT(trace, 4, __FUNCTION__); if (ch == NULL) { ctc_pr_warn("ch_action_start ch=NULL\n"); return; } if (ch->netdev == NULL) { ctc_pr_warn("ch_action_start dev=NULL, id=%s\n", ch->id); return; } dev = ch->netdev; #ifdef DEBUG ctc_pr_debug("%s: %s channel start\n", dev->name, (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); #endif if (ch->trans_skb != NULL) { clear_normalized_cda(&ch->ccw[1]); dev_kfree_skb(ch->trans_skb); ch->trans_skb = NULL; } if (CHANNEL_DIRECTION(ch->flags) == READ) { ch->ccw[1].cmd_code = CCW_CMD_READ; ch->ccw[1].flags = CCW_FLAG_SLI; ch->ccw[1].count = 0; } else { ch->ccw[1].cmd_code = CCW_CMD_WRITE; ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC; ch->ccw[1].count = 0; } if (ctc_checkalloc_buffer(ch, 0)) { ctc_pr_notice( "%s: Could not allocate %s trans_skb, delaying " "allocation until first transfer\n", dev->name, (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); } ch->ccw[0].cmd_code = CCW_CMD_PREPARE; ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC; ch->ccw[0].count = 0; ch->ccw[0].cda = 0; ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */ ch->ccw[2].flags = CCW_FLAG_SLI; ch->ccw[2].count = 0; ch->ccw[2].cda = 0; memcpy(&ch->ccw[3], &ch->ccw[0], sizeof (struct ccw1) * 3); ch->ccw[4].cda = 0; ch->ccw[4].flags &= ~CCW_FLAG_IDA; fsm_newstate(fi, CH_STATE_STARTWAIT); fsm_addtimer(&ch->timer, 1000, CH_EVENT_TIMER, ch); spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); rc = ccw_device_halt(ch->cdev, (unsigned long) ch); spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); if (rc != 0) { if (rc != -EBUSY) fsm_deltimer(&ch->timer); ccw_check_return_code(ch, rc, "initial HaltIO"); } #ifdef DEBUG ctc_pr_debug("ctc: %s(): leaving\n", __func__); #endif } /** * Shutdown a channel. * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_haltio(fsm_instance * fi, int event, void *arg) { struct channel *ch = (struct channel *) arg; unsigned long saveflags; int rc; int oldstate; DBF_TEXT(trace, 3, __FUNCTION__); fsm_deltimer(&ch->timer); fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); saveflags = 0; /* avoids comp warning with spin_unlock_irqrestore */ if (event == CH_EVENT_STOP) // only for STOP not yet locked spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); oldstate = fsm_getstate(fi); fsm_newstate(fi, CH_STATE_TERM); rc = ccw_device_halt(ch->cdev, (unsigned long) ch); if (event == CH_EVENT_STOP) spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); if (rc != 0) { if (rc != -EBUSY) { fsm_deltimer(&ch->timer); fsm_newstate(fi, oldstate); } ccw_check_return_code(ch, rc, "HaltIO in ch_action_haltio"); } } /** * A channel has successfully been halted. * Cleanup it's queue and notify interface statemachine. * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_stopped(fsm_instance * fi, int event, void *arg) { struct channel *ch = (struct channel *) arg; struct net_device *dev = ch->netdev; DBF_TEXT(trace, 3, __FUNCTION__); fsm_deltimer(&ch->timer); fsm_newstate(fi, CH_STATE_STOPPED); if (ch->trans_skb != NULL) { clear_normalized_cda(&ch->ccw[1]); dev_kfree_skb(ch->trans_skb); ch->trans_skb = NULL; } if (CHANNEL_DIRECTION(ch->flags) == READ) { skb_queue_purge(&ch->io_queue); fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXDOWN, dev); } else { ctc_purge_skb_queue(&ch->io_queue); spin_lock(&ch->collect_lock); ctc_purge_skb_queue(&ch->collect_queue); ch->collect_len = 0; spin_unlock(&ch->collect_lock); fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_TXDOWN, dev); } } /** * A stop command from device statemachine arrived and we are in * not operational mode. Set state to stopped. * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_stop(fsm_instance * fi, int event, void *arg) { fsm_newstate(fi, CH_STATE_STOPPED); } /** * A machine check for no path, not operational status or gone device has * happened. * Cleanup queue and notify interface statemachine. * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_fail(fsm_instance * fi, int event, void *arg) { struct channel *ch = (struct channel *) arg; struct net_device *dev = ch->netdev; DBF_TEXT(trace, 3, __FUNCTION__); fsm_deltimer(&ch->timer); fsm_newstate(fi, CH_STATE_NOTOP); if (CHANNEL_DIRECTION(ch->flags) == READ) { skb_queue_purge(&ch->io_queue); fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXDOWN, dev); } else { ctc_purge_skb_queue(&ch->io_queue); spin_lock(&ch->collect_lock); ctc_purge_skb_queue(&ch->collect_queue); ch->collect_len = 0; spin_unlock(&ch->collect_lock); fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_TXDOWN, dev); } } /** * Handle error during setup of channel. * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_setuperr(fsm_instance * fi, int event, void *arg) { struct channel *ch = (struct channel *) arg; struct net_device *dev = ch->netdev; DBF_TEXT(setup, 3, __FUNCTION__); /** * Special case: Got UC_RCRESET on setmode. * This means that remote side isn't setup. In this case * simply retry after some 10 secs... */ if ((fsm_getstate(fi) == CH_STATE_SETUPWAIT) && ((event == CH_EVENT_UC_RCRESET) || (event == CH_EVENT_UC_RSRESET))) { fsm_newstate(fi, CH_STATE_STARTRETRY); fsm_deltimer(&ch->timer); fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); if (CHANNEL_DIRECTION(ch->flags) == READ) { int rc = ccw_device_halt(ch->cdev, (unsigned long) ch); if (rc != 0) ccw_check_return_code( ch, rc, "HaltIO in ch_action_setuperr"); } return; } ctc_pr_debug("%s: Error %s during %s channel setup state=%s\n", dev->name, ch_event_names[event], (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX", fsm_getstate_str(fi)); if (CHANNEL_DIRECTION(ch->flags) == READ) { fsm_newstate(fi, CH_STATE_RXERR); fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXDOWN, dev); } else { fsm_newstate(fi, CH_STATE_TXERR); fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_TXDOWN, dev); } } /** * Restart a channel after an error. * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_restart(fsm_instance * fi, int event, void *arg) { unsigned long saveflags; int oldstate; int rc; struct channel *ch = (struct channel *) arg; struct net_device *dev = ch->netdev; DBF_TEXT(trace, 3, __FUNCTION__); fsm_deltimer(&ch->timer); ctc_pr_debug("%s: %s channel restart\n", dev->name, (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); oldstate = fsm_getstate(fi); fsm_newstate(fi, CH_STATE_STARTWAIT); saveflags = 0; /* avoids compiler warning with spin_unlock_irqrestore */ if (event == CH_EVENT_TIMER) // only for timer not yet locked spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); rc = ccw_device_halt(ch->cdev, (unsigned long) ch); if (event == CH_EVENT_TIMER) spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); if (rc != 0) { if (rc != -EBUSY) { fsm_deltimer(&ch->timer); fsm_newstate(fi, oldstate); } ccw_check_return_code(ch, rc, "HaltIO in ch_action_restart"); } } /** * Handle error during RX initial handshake (exchange of * 0-length block header) * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_rxiniterr(fsm_instance * fi, int event, void *arg) { struct channel *ch = (struct channel *) arg; struct net_device *dev = ch->netdev; DBF_TEXT(setup, 3, __FUNCTION__); if (event == CH_EVENT_TIMER) { fsm_deltimer(&ch->timer); ctc_pr_debug("%s: Timeout during RX init handshake\n", dev->name); if (ch->retry++ < 3) ch_action_restart(fi, event, arg); else { fsm_newstate(fi, CH_STATE_RXERR); fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXDOWN, dev); } } else ctc_pr_warn("%s: Error during RX init handshake\n", dev->name); } /** * Notify device statemachine if we gave up initialization * of RX channel. * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_rxinitfail(fsm_instance * fi, int event, void *arg) { struct channel *ch = (struct channel *) arg; struct net_device *dev = ch->netdev; DBF_TEXT(setup, 3, __FUNCTION__); fsm_newstate(fi, CH_STATE_RXERR); ctc_pr_warn("%s: RX initialization failed\n", dev->name); ctc_pr_warn("%s: RX <-> RX connection detected\n", dev->name); fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXDOWN, dev); } /** * Handle RX Unit check remote reset (remote disconnected) * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_rxdisc(fsm_instance * fi, int event, void *arg) { struct channel *ch = (struct channel *) arg; struct channel *ch2; struct net_device *dev = ch->netdev; DBF_TEXT(trace, 3, __FUNCTION__); fsm_deltimer(&ch->timer); ctc_pr_debug("%s: Got remote disconnect, re-initializing ...\n", dev->name); /** * Notify device statemachine */ fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXDOWN, dev); fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_TXDOWN, dev); fsm_newstate(fi, CH_STATE_DTERM); ch2 = ((struct ctc_priv *) dev->priv)->channel[WRITE]; fsm_newstate(ch2->fsm, CH_STATE_DTERM); ccw_device_halt(ch->cdev, (unsigned long) ch); ccw_device_halt(ch2->cdev, (unsigned long) ch2); } /** * Handle error during TX channel initialization. * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_txiniterr(fsm_instance * fi, int event, void *arg) { struct channel *ch = (struct channel *) arg; struct net_device *dev = ch->netdev; DBF_TEXT(setup, 2, __FUNCTION__); if (event == CH_EVENT_TIMER) { fsm_deltimer(&ch->timer); ctc_pr_debug("%s: Timeout during TX init handshake\n", dev->name); if (ch->retry++ < 3) ch_action_restart(fi, event, arg); else { fsm_newstate(fi, CH_STATE_TXERR); fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_TXDOWN, dev); } } else ctc_pr_warn("%s: Error during TX init handshake\n", dev->name); } /** * Handle TX timeout by retrying operation. * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_txretry(fsm_instance * fi, int event, void *arg) { struct channel *ch = (struct channel *) arg; struct net_device *dev = ch->netdev; unsigned long saveflags; DBF_TEXT(trace, 4, __FUNCTION__); fsm_deltimer(&ch->timer); if (ch->retry++ > 3) { ctc_pr_debug("%s: TX retry failed, restarting channel\n", dev->name); fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_TXDOWN, dev); ch_action_restart(fi, event, arg); } else { struct sk_buff *skb; ctc_pr_debug("%s: TX retry %d\n", dev->name, ch->retry); if ((skb = skb_peek(&ch->io_queue))) { int rc = 0; clear_normalized_cda(&ch->ccw[4]); ch->ccw[4].count = skb->len; if (set_normalized_cda(&ch->ccw[4], skb->data)) { ctc_pr_debug( "%s: IDAL alloc failed, chan restart\n", dev->name); fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_TXDOWN, dev); ch_action_restart(fi, event, arg); return; } fsm_addtimer(&ch->timer, 1000, CH_EVENT_TIMER, ch); saveflags = 0; /* avoids compiler warning with spin_unlock_irqrestore */ if (event == CH_EVENT_TIMER) // only for TIMER not yet locked spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); rc = ccw_device_start(ch->cdev, &ch->ccw[3], (unsigned long) ch, 0xff, 0); if (event == CH_EVENT_TIMER) spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); if (rc != 0) { fsm_deltimer(&ch->timer); ccw_check_return_code(ch, rc, "TX in ch_action_txretry"); ctc_purge_skb_queue(&ch->io_queue); } } } } /** * Handle fatal errors during an I/O command. * * @param fi An instance of a channel statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from channel * upon call. */ static void ch_action_iofatal(fsm_instance * fi, int event, void *arg) { struct channel *ch = (struct channel *) arg; struct net_device *dev = ch->netdev; DBF_TEXT(trace, 3, __FUNCTION__); fsm_deltimer(&ch->timer); if (CHANNEL_DIRECTION(ch->flags) == READ) { ctc_pr_debug("%s: RX I/O error\n", dev->name); fsm_newstate(fi, CH_STATE_RXERR); fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXDOWN, dev); } else { ctc_pr_debug("%s: TX I/O error\n", dev->name); fsm_newstate(fi, CH_STATE_TXERR); fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_TXDOWN, dev); } } static void ch_action_reinit(fsm_instance *fi, int event, void *arg) { struct channel *ch = (struct channel *)arg; struct net_device *dev = ch->netdev; struct ctc_priv *privptr = dev->priv; DBF_TEXT(trace, 4, __FUNCTION__); ch_action_iofatal(fi, event, arg); fsm_addtimer(&privptr->restart_timer, 1000, DEV_EVENT_RESTART, dev); } /** * The statemachine for a channel. */ static const fsm_node ch_fsm[] = { {CH_STATE_STOPPED, CH_EVENT_STOP, fsm_action_nop }, {CH_STATE_STOPPED, CH_EVENT_START, ch_action_start }, {CH_STATE_STOPPED, CH_EVENT_FINSTAT, fsm_action_nop }, {CH_STATE_STOPPED, CH_EVENT_MC_FAIL, fsm_action_nop }, {CH_STATE_NOTOP, CH_EVENT_STOP, ch_action_stop }, {CH_STATE_NOTOP, CH_EVENT_START, fsm_action_nop }, {CH_STATE_NOTOP, CH_EVENT_FINSTAT, fsm_action_nop }, {CH_STATE_NOTOP, CH_EVENT_MC_FAIL, fsm_action_nop }, {CH_STATE_NOTOP, CH_EVENT_MC_GOOD, ch_action_start }, {CH_STATE_STARTWAIT, CH_EVENT_STOP, ch_action_haltio }, {CH_STATE_STARTWAIT, CH_EVENT_START, fsm_action_nop }, {CH_STATE_STARTWAIT, CH_EVENT_FINSTAT, ch_action_setmode }, {CH_STATE_STARTWAIT, CH_EVENT_TIMER, ch_action_setuperr }, {CH_STATE_STARTWAIT, CH_EVENT_IO_ENODEV, ch_action_iofatal }, {CH_STATE_STARTWAIT, CH_EVENT_IO_EIO, ch_action_reinit }, {CH_STATE_STARTWAIT, CH_EVENT_MC_FAIL, ch_action_fail }, {CH_STATE_STARTRETRY, CH_EVENT_STOP, ch_action_haltio }, {CH_STATE_STARTRETRY, CH_EVENT_TIMER, ch_action_setmode }, {CH_STATE_STARTRETRY, CH_EVENT_FINSTAT, fsm_action_nop }, {CH_STATE_STARTRETRY, CH_EVENT_MC_FAIL, ch_action_fail }, {CH_STATE_SETUPWAIT, CH_EVENT_STOP, ch_action_haltio }, {CH_STATE_SETUPWAIT, CH_EVENT_START, fsm_action_nop }, {CH_STATE_SETUPWAIT, CH_EVENT_FINSTAT, ch_action_firstio }, {CH_STATE_SETUPWAIT, CH_EVENT_UC_RCRESET, ch_action_setuperr }, {CH_STATE_SETUPWAIT, CH_EVENT_UC_RSRESET, ch_action_setuperr }, {CH_STATE_SETUPWAIT, CH_EVENT_TIMER, ch_action_setmode }, {CH_STATE_SETUPWAIT, CH_EVENT_IO_ENODEV, ch_action_iofatal }, {CH_STATE_SETUPWAIT, CH_EVENT_IO_EIO, ch_action_reinit }, {CH_STATE_SETUPWAIT, CH_EVENT_MC_FAIL, ch_action_fail }, {CH_STATE_RXINIT, CH_EVENT_STOP, ch_action_haltio }, {CH_STATE_RXINIT, CH_EVENT_START, fsm_action_nop }, {CH_STATE_RXINIT, CH_EVENT_FINSTAT, ch_action_rxidle }, {CH_STATE_RXINIT, CH_EVENT_UC_RCRESET, ch_action_rxiniterr }, {CH_STATE_RXINIT, CH_EVENT_UC_RSRESET, ch_action_rxiniterr }, {CH_STATE_RXINIT, CH_EVENT_TIMER, ch_action_rxiniterr }, {CH_STATE_RXINIT, CH_EVENT_ATTNBUSY, ch_action_rxinitfail }, {CH_STATE_RXINIT, CH_EVENT_IO_ENODEV, ch_action_iofatal }, {CH_STATE_RXINIT, CH_EVENT_IO_EIO, ch_action_reinit }, {CH_STATE_RXINIT, CH_EVENT_UC_ZERO, ch_action_firstio }, {CH_STATE_RXINIT, CH_EVENT_MC_FAIL, ch_action_fail }, {CH_STATE_RXIDLE, CH_EVENT_STOP, ch_action_haltio }, {CH_STATE_RXIDLE, CH_EVENT_START, fsm_action_nop }, {CH_STATE_RXIDLE, CH_EVENT_FINSTAT, ch_action_rx }, {CH_STATE_RXIDLE, CH_EVENT_UC_RCRESET, ch_action_rxdisc }, // {CH_STATE_RXIDLE, CH_EVENT_UC_RSRESET, ch_action_rxretry }, {CH_STATE_RXIDLE, CH_EVENT_IO_ENODEV, ch_action_iofatal }, {CH_STATE_RXIDLE, CH_EVENT_IO_EIO, ch_action_reinit }, {CH_STATE_RXIDLE, CH_EVENT_MC_FAIL, ch_action_fail }, {CH_STATE_RXIDLE, CH_EVENT_UC_ZERO, ch_action_rx }, {CH_STATE_TXINIT, CH_EVENT_STOP, ch_action_haltio }, {CH_STATE_TXINIT, CH_EVENT_START, fsm_action_nop }, {CH_STATE_TXINIT, CH_EVENT_FINSTAT, ch_action_txidle }, {CH_STATE_TXINIT, CH_EVENT_UC_RCRESET, ch_action_txiniterr }, {CH_STATE_TXINIT, CH_EVENT_UC_RSRESET, ch_action_txiniterr }, {CH_STATE_TXINIT, CH_EVENT_TIMER, ch_action_txiniterr }, {CH_STATE_TXINIT, CH_EVENT_IO_ENODEV, ch_action_iofatal }, {CH_STATE_TXINIT, CH_EVENT_IO_EIO, ch_action_reinit }, {CH_STATE_TXINIT, CH_EVENT_MC_FAIL, ch_action_fail }, {CH_STATE_TXIDLE, CH_EVENT_STOP, ch_action_haltio }, {CH_STATE_TXIDLE, CH_EVENT_START, fsm_action_nop }, {CH_STATE_TXIDLE, CH_EVENT_FINSTAT, ch_action_firstio }, {CH_STATE_TXIDLE, CH_EVENT_UC_RCRESET, fsm_action_nop }, {CH_STATE_TXIDLE, CH_EVENT_UC_RSRESET, fsm_action_nop }, {CH_STATE_TXIDLE, CH_EVENT_IO_ENODEV, ch_action_iofatal }, {CH_STATE_TXIDLE, CH_EVENT_IO_EIO, ch_action_reinit }, {CH_STATE_TXIDLE, CH_EVENT_MC_FAIL, ch_action_fail }, {CH_STATE_TERM, CH_EVENT_STOP, fsm_action_nop }, {CH_STATE_TERM, CH_EVENT_START, ch_action_restart }, {CH_STATE_TERM, CH_EVENT_FINSTAT, ch_action_stopped }, {CH_STATE_TERM, CH_EVENT_UC_RCRESET, fsm_action_nop }, {CH_STATE_TERM, CH_EVENT_UC_RSRESET, fsm_action_nop }, {CH_STATE_TERM, CH_EVENT_MC_FAIL, ch_action_fail }, {CH_STATE_DTERM, CH_EVENT_STOP, ch_action_haltio }, {CH_STATE_DTERM, CH_EVENT_START, ch_action_restart }, {CH_STATE_DTERM, CH_EVENT_FINSTAT, ch_action_setmode }, {CH_STATE_DTERM, CH_EVENT_UC_RCRESET, fsm_action_nop }, {CH_STATE_DTERM, CH_EVENT_UC_RSRESET, fsm_action_nop }, {CH_STATE_DTERM, CH_EVENT_MC_FAIL, ch_action_fail }, {CH_STATE_TX, CH_EVENT_STOP, ch_action_haltio }, {CH_STATE_TX, CH_EVENT_START, fsm_action_nop }, {CH_STATE_TX, CH_EVENT_FINSTAT, ch_action_txdone }, {CH_STATE_TX, CH_EVENT_UC_RCRESET, ch_action_txretry }, {CH_STATE_TX, CH_EVENT_UC_RSRESET, ch_action_txretry }, {CH_STATE_TX, CH_EVENT_TIMER, ch_action_txretry }, {CH_STATE_TX, CH_EVENT_IO_ENODEV, ch_action_iofatal }, {CH_STATE_TX, CH_EVENT_IO_EIO, ch_action_reinit }, {CH_STATE_TX, CH_EVENT_MC_FAIL, ch_action_fail }, {CH_STATE_RXERR, CH_EVENT_STOP, ch_action_haltio }, {CH_STATE_TXERR, CH_EVENT_STOP, ch_action_haltio }, {CH_STATE_TXERR, CH_EVENT_MC_FAIL, ch_action_fail }, {CH_STATE_RXERR, CH_EVENT_MC_FAIL, ch_action_fail }, }; static const int CH_FSM_LEN = sizeof (ch_fsm) / sizeof (fsm_node); /** * Functions related to setup and device detection. *****************************************************************************/ static inline int less_than(char *id1, char *id2) { int dev1, dev2, i; for (i = 0; i < 5; i++) { id1++; id2++; } dev1 = simple_strtoul(id1, &id1, 16); dev2 = simple_strtoul(id2, &id2, 16); return (dev1 < dev2); } /** * Add a new channel to the list of channels. * Keeps the channel list sorted. * * @param cdev The ccw_device to be added. * @param type The type class of the new channel. * * @return 0 on success, !0 on error. */ static int add_channel(struct ccw_device *cdev, enum channel_types type) { struct channel **c = &channels; struct channel *ch; DBF_TEXT(trace, 2, __FUNCTION__); if ((ch = (struct channel *) kmalloc(sizeof (struct channel), GFP_KERNEL)) == NULL) { ctc_pr_warn("ctc: Out of memory in add_channel\n"); return -1; } memset(ch, 0, sizeof (struct channel)); if ((ch->ccw = (struct ccw1 *) kmalloc(8*sizeof(struct ccw1), GFP_KERNEL | GFP_DMA)) == NULL) { kfree(ch); ctc_pr_warn("ctc: Out of memory in add_channel\n"); return -1; } memset(ch->ccw, 0, 8*sizeof(struct ccw1)); // assure all flags and counters are reset /** * "static" ccws are used in the following way: * * ccw[0..2] (Channel program for generic I/O): * 0: prepare * 1: read or write (depending on direction) with fixed * buffer (idal allocated once when buffer is allocated) * 2: nop * ccw[3..5] (Channel program for direct write of packets) * 3: prepare * 4: write (idal allocated on every write). * 5: nop * ccw[6..7] (Channel program for initial channel setup): * 6: set extended mode * 7: nop * * ch->ccw[0..5] are initialized in ch_action_start because * the channel's direction is yet unknown here. */ ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED; ch->ccw[6].flags = CCW_FLAG_SLI; ch->ccw[7].cmd_code = CCW_CMD_NOOP; ch->ccw[7].flags = CCW_FLAG_SLI; ch->cdev = cdev; snprintf(ch->id, CTC_ID_SIZE, "ch-%s", cdev->dev.bus_id); ch->type = type; ch->fsm = init_fsm(ch->id, ch_state_names, ch_event_names, NR_CH_STATES, NR_CH_EVENTS, ch_fsm, CH_FSM_LEN, GFP_KERNEL); if (ch->fsm == NULL) { ctc_pr_warn("ctc: Could not create FSM in add_channel\n"); kfree(ch->ccw); kfree(ch); return -1; } fsm_newstate(ch->fsm, CH_STATE_IDLE); if ((ch->irb = (struct irb *) kmalloc(sizeof (struct irb), GFP_KERNEL)) == NULL) { ctc_pr_warn("ctc: Out of memory in add_channel\n"); kfree_fsm(ch->fsm); kfree(ch->ccw); kfree(ch); return -1; } memset(ch->irb, 0, sizeof (struct irb)); while (*c && less_than((*c)->id, ch->id)) c = &(*c)->next; if (*c && (!strncmp((*c)->id, ch->id, CTC_ID_SIZE))) { ctc_pr_debug( "ctc: add_channel: device %s already in list, " "using old entry\n", (*c)->id); kfree(ch->irb); kfree_fsm(ch->fsm); kfree(ch->ccw); kfree(ch); return 0; } fsm_settimer(ch->fsm, &ch->timer); skb_queue_head_init(&ch->io_queue); skb_queue_head_init(&ch->collect_queue); ch->next = *c; *c = ch; return 0; } /** * Release a specific channel in the channel list. * * @param ch Pointer to channel struct to be released. */ static void channel_free(struct channel *ch) { ch->flags &= ~CHANNEL_FLAGS_INUSE; fsm_newstate(ch->fsm, CH_STATE_IDLE); } /** * Remove a specific channel in the channel list. * * @param ch Pointer to channel struct to be released. */ static void channel_remove(struct channel *ch) { struct channel **c = &channels; DBF_TEXT(trace, 2, __FUNCTION__); if (ch == NULL) return; channel_free(ch); while (*c) { if (*c == ch) { *c = ch->next; fsm_deltimer(&ch->timer); kfree_fsm(ch->fsm); clear_normalized_cda(&ch->ccw[4]); if (ch->trans_skb != NULL) { clear_normalized_cda(&ch->ccw[1]); dev_kfree_skb(ch->trans_skb); } kfree(ch->ccw); kfree(ch->irb); kfree(ch); return; } c = &((*c)->next); } } /** * Get a specific channel from the channel list. * * @param type Type of channel we are interested in. * @param id Id of channel we are interested in. * @param direction Direction we want to use this channel for. * * @return Pointer to a channel or NULL if no matching channel available. */ static struct channel * channel_get(enum channel_types type, char *id, int direction) { struct channel *ch = channels; DBF_TEXT(trace, 3, __FUNCTION__); #ifdef DEBUG ctc_pr_debug("ctc: %s(): searching for ch with id %s and type %d\n", __func__, id, type); #endif while (ch && ((strncmp(ch->id, id, CTC_ID_SIZE)) || (ch->type != type))) { #ifdef DEBUG ctc_pr_debug("ctc: %s(): ch=0x%p (id=%s, type=%d\n", __func__, ch, ch->id, ch->type); #endif ch = ch->next; } #ifdef DEBUG ctc_pr_debug("ctc: %s(): ch=0x%pq (id=%s, type=%d\n", __func__, ch, ch->id, ch->type); #endif if (!ch) { ctc_pr_warn("ctc: %s(): channel with id %s " "and type %d not found in channel list\n", __func__, id, type); } else { if (ch->flags & CHANNEL_FLAGS_INUSE) ch = NULL; else { ch->flags |= CHANNEL_FLAGS_INUSE; ch->flags &= ~CHANNEL_FLAGS_RWMASK; ch->flags |= (direction == WRITE) ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ; fsm_newstate(ch->fsm, CH_STATE_STOPPED); } } return ch; } /** * Return the channel type by name. * * @param name Name of network interface. * * @return Type class of channel to be used for that interface. */ static enum channel_types inline extract_channel_media(char *name) { enum channel_types ret = channel_type_unknown; if (name != NULL) { if (strncmp(name, "ctc", 3) == 0) ret = channel_type_parallel; if (strncmp(name, "escon", 5) == 0) ret = channel_type_escon; } return ret; } static long __ctc_check_irb_error(struct ccw_device *cdev, struct irb *irb) { if (!IS_ERR(irb)) return 0; switch (PTR_ERR(irb)) { case -EIO: ctc_pr_warn("i/o-error on device %s\n", cdev->dev.bus_id); // CTC_DBF_TEXT(trace, 2, "ckirberr"); // CTC_DBF_TEXT_(trace, 2, " rc%d", -EIO); break; case -ETIMEDOUT: ctc_pr_warn("timeout on device %s\n", cdev->dev.bus_id); // CTC_DBF_TEXT(trace, 2, "ckirberr"); // CTC_DBF_TEXT_(trace, 2, " rc%d", -ETIMEDOUT); break; default: ctc_pr_warn("unknown error %ld on device %s\n", PTR_ERR(irb), cdev->dev.bus_id); // CTC_DBF_TEXT(trace, 2, "ckirberr"); // CTC_DBF_TEXT(trace, 2, " rc???"); } return PTR_ERR(irb); } /** * Main IRQ handler. * * @param cdev The ccw_device the interrupt is for. * @param intparm interruption parameter. * @param irb interruption response block. */ static void ctc_irq_handler(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) { struct channel *ch; struct net_device *dev; struct ctc_priv *priv; DBF_TEXT(trace, 5, __FUNCTION__); if (__ctc_check_irb_error(cdev, irb)) return; /* Check for unsolicited interrupts. */ if (!cdev->dev.driver_data) { ctc_pr_warn("ctc: Got unsolicited irq: %s c-%02x d-%02x\n", cdev->dev.bus_id, irb->scsw.cstat, irb->scsw.dstat); return; } priv = ((struct ccwgroup_device *)cdev->dev.driver_data) ->dev.driver_data; /* Try to extract channel from driver data. */ if (priv->channel[READ]->cdev == cdev) ch = priv->channel[READ]; else if (priv->channel[WRITE]->cdev == cdev) ch = priv->channel[WRITE]; else { ctc_pr_err("ctc: Can't determine channel for interrupt, " "device %s\n", cdev->dev.bus_id); return; } dev = (struct net_device *) (ch->netdev); if (dev == NULL) { ctc_pr_crit("ctc: ctc_irq_handler dev=NULL bus_id=%s, ch=0x%p\n", cdev->dev.bus_id, ch); return; } #ifdef DEBUG ctc_pr_debug("%s: interrupt for device: %s received c-%02x d-%02x\n", dev->name, ch->id, irb->scsw.cstat, irb->scsw.dstat); #endif /* Copy interruption response block. */ memcpy(ch->irb, irb, sizeof(struct irb)); /* Check for good subchannel return code, otherwise error message */ if (ch->irb->scsw.cstat) { fsm_event(ch->fsm, CH_EVENT_SC_UNKNOWN, ch); ctc_pr_warn("%s: subchannel check for device: %s - %02x %02x\n", dev->name, ch->id, ch->irb->scsw.cstat, ch->irb->scsw.dstat); return; } /* Check the reason-code of a unit check */ if (ch->irb->scsw.dstat & DEV_STAT_UNIT_CHECK) { ccw_unit_check(ch, ch->irb->ecw[0]); return; } if (ch->irb->scsw.dstat & DEV_STAT_BUSY) { if (ch->irb->scsw.dstat & DEV_STAT_ATTENTION) fsm_event(ch->fsm, CH_EVENT_ATTNBUSY, ch); else fsm_event(ch->fsm, CH_EVENT_BUSY, ch); return; } if (ch->irb->scsw.dstat & DEV_STAT_ATTENTION) { fsm_event(ch->fsm, CH_EVENT_ATTN, ch); return; } if ((ch->irb->scsw.stctl & SCSW_STCTL_SEC_STATUS) || (ch->irb->scsw.stctl == SCSW_STCTL_STATUS_PEND) || (ch->irb->scsw.stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) fsm_event(ch->fsm, CH_EVENT_FINSTAT, ch); else fsm_event(ch->fsm, CH_EVENT_IRQ, ch); } /** * Actions for interface - statemachine. *****************************************************************************/ /** * Startup channels by sending CH_EVENT_START to each channel. * * @param fi An instance of an interface statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from struct net_device * upon call. */ static void dev_action_start(fsm_instance * fi, int event, void *arg) { struct net_device *dev = (struct net_device *) arg; struct ctc_priv *privptr = dev->priv; int direction; DBF_TEXT(setup, 3, __FUNCTION__); fsm_deltimer(&privptr->restart_timer); fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); for (direction = READ; direction <= WRITE; direction++) { struct channel *ch = privptr->channel[direction]; fsm_event(ch->fsm, CH_EVENT_START, ch); } } /** * Shutdown channels by sending CH_EVENT_STOP to each channel. * * @param fi An instance of an interface statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from struct net_device * upon call. */ static void dev_action_stop(fsm_instance * fi, int event, void *arg) { struct net_device *dev = (struct net_device *) arg; struct ctc_priv *privptr = dev->priv; int direction; DBF_TEXT(trace, 3, __FUNCTION__); fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); for (direction = READ; direction <= WRITE; direction++) { struct channel *ch = privptr->channel[direction]; fsm_event(ch->fsm, CH_EVENT_STOP, ch); } } static void dev_action_restart(fsm_instance *fi, int event, void *arg) { struct net_device *dev = (struct net_device *)arg; struct ctc_priv *privptr = dev->priv; DBF_TEXT(trace, 3, __FUNCTION__); ctc_pr_debug("%s: Restarting\n", dev->name); dev_action_stop(fi, event, arg); fsm_event(privptr->fsm, DEV_EVENT_STOP, dev); fsm_addtimer(&privptr->restart_timer, CTC_TIMEOUT_5SEC, DEV_EVENT_START, dev); } /** * Called from channel statemachine * when a channel is up and running. * * @param fi An instance of an interface statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from struct net_device * upon call. */ static void dev_action_chup(fsm_instance * fi, int event, void *arg) { struct net_device *dev = (struct net_device *) arg; struct ctc_priv *privptr = dev->priv; DBF_TEXT(trace, 3, __FUNCTION__); switch (fsm_getstate(fi)) { case DEV_STATE_STARTWAIT_RXTX: if (event == DEV_EVENT_RXUP) fsm_newstate(fi, DEV_STATE_STARTWAIT_TX); else fsm_newstate(fi, DEV_STATE_STARTWAIT_RX); break; case DEV_STATE_STARTWAIT_RX: if (event == DEV_EVENT_RXUP) { fsm_newstate(fi, DEV_STATE_RUNNING); ctc_pr_info("%s: connected with remote side\n", dev->name); if (privptr->protocol == CTC_PROTO_LINUX_TTY) ctc_tty_setcarrier(dev, 1); ctc_clear_busy(dev); } break; case DEV_STATE_STARTWAIT_TX: if (event == DEV_EVENT_TXUP) { fsm_newstate(fi, DEV_STATE_RUNNING); ctc_pr_info("%s: connected with remote side\n", dev->name); if (privptr->protocol == CTC_PROTO_LINUX_TTY) ctc_tty_setcarrier(dev, 1); ctc_clear_busy(dev); } break; case DEV_STATE_STOPWAIT_TX: if (event == DEV_EVENT_RXUP) fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); break; case DEV_STATE_STOPWAIT_RX: if (event == DEV_EVENT_TXUP) fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); break; } } /** * Called from channel statemachine * when a channel has been shutdown. * * @param fi An instance of an interface statemachine. * @param event The event, just happened. * @param arg Generic pointer, casted from struct net_device * upon call. */ static void dev_action_chdown(fsm_instance * fi, int event, void *arg) { struct net_device *dev = (struct net_device *) arg; struct ctc_priv *privptr = dev->priv; DBF_TEXT(trace, 3, __FUNCTION__); switch (fsm_getstate(fi)) { case DEV_STATE_RUNNING: if (privptr->protocol == CTC_PROTO_LINUX_TTY) ctc_tty_setcarrier(dev, 0); if (event == DEV_EVENT_TXDOWN) fsm_newstate(fi, DEV_STATE_STARTWAIT_TX); else fsm_newstate(fi, DEV_STATE_STARTWAIT_RX); break; case DEV_STATE_STARTWAIT_RX: if (event == DEV_EVENT_TXDOWN) fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); break; case DEV_STATE_STARTWAIT_TX: if (event == DEV_EVENT_RXDOWN) fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); break; case DEV_STATE_STOPWAIT_RXTX: if (event == DEV_EVENT_TXDOWN) fsm_newstate(fi, DEV_STATE_STOPWAIT_RX); else fsm_newstate(fi, DEV_STATE_STOPWAIT_TX); break; case DEV_STATE_STOPWAIT_RX: if (event == DEV_EVENT_RXDOWN) fsm_newstate(fi, DEV_STATE_STOPPED); break; case DEV_STATE_STOPWAIT_TX: if (event == DEV_EVENT_TXDOWN) fsm_newstate(fi, DEV_STATE_STOPPED); break; } } static const fsm_node dev_fsm[] = { {DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start}, {DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start }, {DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown }, {DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown }, {DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart }, {DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start }, {DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup }, {DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup }, {DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown }, {DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart }, {DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start }, {DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup }, {DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup }, {DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown }, {DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart }, {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop }, {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup }, {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup }, {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown }, {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown }, {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart }, {DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop }, {DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup }, {DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup }, {DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown }, {DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart }, {DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop }, {DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup }, {DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup }, {DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown }, {DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart }, {DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop }, {DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown }, {DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown }, {DEV_STATE_RUNNING, DEV_EVENT_TXUP, fsm_action_nop }, {DEV_STATE_RUNNING, DEV_EVENT_RXUP, fsm_action_nop }, {DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart }, }; static const int DEV_FSM_LEN = sizeof (dev_fsm) / sizeof (fsm_node); /** * Transmit a packet. * This is a helper function for ctc_tx(). * * @param ch Channel to be used for sending. * @param skb Pointer to struct sk_buff of packet to send. * The linklevel header has already been set up * by ctc_tx(). * * @return 0 on success, -ERRNO on failure. (Never fails.) */ static int transmit_skb(struct channel *ch, struct sk_buff *skb) { unsigned long saveflags; struct ll_header header; int rc = 0; DBF_TEXT(trace, 5, __FUNCTION__); /* we need to acquire the lock for testing the state * otherwise we can have an IRQ changing the state to * TXIDLE after the test but before acquiring the lock. */ spin_lock_irqsave(&ch->collect_lock, saveflags); if (fsm_getstate(ch->fsm) != CH_STATE_TXIDLE) { int l = skb->len + LL_HEADER_LENGTH; if (ch->collect_len + l > ch->max_bufsize - 2) { spin_unlock_irqrestore(&ch->collect_lock, saveflags); return -EBUSY; } else { atomic_inc(&skb->users); header.length = l; header.type = skb->protocol; header.unused = 0; memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH); skb_queue_tail(&ch->collect_queue, skb); ch->collect_len += l; } spin_unlock_irqrestore(&ch->collect_lock, saveflags); } else { __u16 block_len; int ccw_idx; struct sk_buff *nskb; unsigned long hi; spin_unlock_irqrestore(&ch->collect_lock, saveflags); /** * Protect skb against beeing free'd by upper * layers. */ atomic_inc(&skb->users); ch->prof.txlen += skb->len; header.length = skb->len + LL_HEADER_LENGTH; header.type = skb->protocol; header.unused = 0; memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH); block_len = skb->len + 2; *((__u16 *) skb_push(skb, 2)) = block_len; /** * IDAL support in CTC is broken, so we have to * care about skb's above 2G ourselves. */ hi = ((unsigned long) skb->tail + LL_HEADER_LENGTH) >> 31; if (hi) { nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); if (!nskb) { atomic_dec(&skb->users); skb_pull(skb, LL_HEADER_LENGTH + 2); ctc_clear_busy(ch->netdev); return -ENOMEM; } else { memcpy(skb_put(nskb, skb->len), skb->data, skb->len); atomic_inc(&nskb->users); atomic_dec(&skb->users); dev_kfree_skb_irq(skb); skb = nskb; } } ch->ccw[4].count = block_len; if (set_normalized_cda(&ch->ccw[4], skb->data)) { /** * idal allocation failed, try via copying to * trans_skb. trans_skb usually has a pre-allocated * idal. */ if (ctc_checkalloc_buffer(ch, 1)) { /** * Remove our header. It gets added * again on retransmit. */ atomic_dec(&skb->users); skb_pull(skb, LL_HEADER_LENGTH + 2); ctc_clear_busy(ch->netdev); return -EBUSY; } ch->trans_skb->tail = ch->trans_skb->data; ch->trans_skb->len = 0; ch->ccw[1].count = skb->len; memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len); atomic_dec(&skb->users); dev_kfree_skb_irq(skb); ccw_idx = 0; } else { skb_queue_tail(&ch->io_queue, skb); ccw_idx = 3; } ch->retry = 0; fsm_newstate(ch->fsm, CH_STATE_TX); fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); ch->prof.send_stamp = xtime; rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], (unsigned long) ch, 0xff, 0); spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); if (ccw_idx == 3) ch->prof.doios_single++; if (rc != 0) { fsm_deltimer(&ch->timer); ccw_check_return_code(ch, rc, "single skb TX"); if (ccw_idx == 3) skb_dequeue_tail(&ch->io_queue); /** * Remove our header. It gets added * again on retransmit. */ skb_pull(skb, LL_HEADER_LENGTH + 2); } else { if (ccw_idx == 0) { struct net_device *dev = ch->netdev; struct ctc_priv *privptr = dev->priv; privptr->stats.tx_packets++; privptr->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; } } } ctc_clear_busy(ch->netdev); return rc; } /** * Interface API for upper network layers *****************************************************************************/ /** * Open an interface. * Called from generic network layer when ifconfig up is run. * * @param dev Pointer to interface struct. * * @return 0 on success, -ERRNO on failure. (Never fails.) */ static int ctc_open(struct net_device * dev) { DBF_TEXT(trace, 5, __FUNCTION__); fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_START, dev); return 0; } /** * Close an interface. * Called from generic network layer when ifconfig down is run. * * @param dev Pointer to interface struct. * * @return 0 on success, -ERRNO on failure. (Never fails.) */ static int ctc_close(struct net_device * dev) { DBF_TEXT(trace, 5, __FUNCTION__); fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_STOP, dev); return 0; } /** * Start transmission of a packet. * Called from generic network device layer. * * @param skb Pointer to buffer containing the packet. * @param dev Pointer to interface struct. * * @return 0 if packet consumed, !0 if packet rejected. * Note: If we return !0, then the packet is free'd by * the generic network layer. */ static int ctc_tx(struct sk_buff *skb, struct net_device * dev) { int rc = 0; struct ctc_priv *privptr = (struct ctc_priv *) dev->priv; DBF_TEXT(trace, 5, __FUNCTION__); /** * Some sanity checks ... */ if (skb == NULL) { ctc_pr_warn("%s: NULL sk_buff passed\n", dev->name); privptr->stats.tx_dropped++; return 0; } if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) { ctc_pr_warn("%s: Got sk_buff with head room < %ld bytes\n", dev->name, LL_HEADER_LENGTH + 2); dev_kfree_skb(skb); privptr->stats.tx_dropped++; return 0; } /** * If channels are not running, try to restart them * and throw away packet. */ if (fsm_getstate(privptr->fsm) != DEV_STATE_RUNNING) { fsm_event(privptr->fsm, DEV_EVENT_START, dev); if (privptr->protocol == CTC_PROTO_LINUX_TTY) return -EBUSY; dev_kfree_skb(skb); privptr->stats.tx_dropped++; privptr->stats.tx_errors++; privptr->stats.tx_carrier_errors++; return 0; } if (ctc_test_and_set_busy(dev)) return -EBUSY; dev->trans_start = jiffies; if (transmit_skb(privptr->channel[WRITE], skb) != 0) rc = 1; return rc; } /** * Sets MTU of an interface. * * @param dev Pointer to interface struct. * @param new_mtu The new MTU to use for this interface. * * @return 0 on success, -EINVAL if MTU is out of valid range. * (valid range is 576 .. 65527). If VM is on the * remote side, maximum MTU is 32760, however this is * <em>not</em> checked here. */ static int ctc_change_mtu(struct net_device * dev, int new_mtu) { struct ctc_priv *privptr = (struct ctc_priv *) dev->priv; DBF_TEXT(trace, 3, __FUNCTION__); if ((new_mtu < 576) || (new_mtu > 65527) || (new_mtu > (privptr->channel[READ]->max_bufsize - LL_HEADER_LENGTH - 2))) return -EINVAL; dev->mtu = new_mtu; dev->hard_header_len = LL_HEADER_LENGTH + 2; return 0; } /** * Returns interface statistics of a device. * * @param dev Pointer to interface struct. * * @return Pointer to stats struct of this interface. */ static struct net_device_stats * ctc_stats(struct net_device * dev) { return &((struct ctc_priv *) dev->priv)->stats; } /* * sysfs attributes */ static ssize_t buffer_show(struct device *dev, struct device_attribute *attr, char *buf) { struct ctc_priv *priv; priv = dev->driver_data; if (!priv) return -ENODEV; return sprintf(buf, "%d\n", priv->buffer_size); } static ssize_t buffer_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct ctc_priv *priv; struct net_device *ndev; int bs1; char buffer[16]; DBF_TEXT(trace, 3, __FUNCTION__); DBF_TEXT(trace, 3, buf); priv = dev->driver_data; if (!priv) { DBF_TEXT(trace, 3, "bfnopriv"); return -ENODEV; } sscanf(buf, "%u", &bs1); if (bs1 > CTC_BUFSIZE_LIMIT) goto einval; if (bs1 < (576 + LL_HEADER_LENGTH + 2)) goto einval; priv->buffer_size = bs1; // just to overwrite the default ndev = priv->channel[READ]->netdev; if (!ndev) { DBF_TEXT(trace, 3, "bfnondev"); return -ENODEV; } if ((ndev->flags & IFF_RUNNING) && (bs1 < (ndev->mtu + LL_HEADER_LENGTH + 2))) goto einval; priv->channel[READ]->max_bufsize = bs1; priv->channel[WRITE]->max_bufsize = bs1; if (!(ndev->flags & IFF_RUNNING)) ndev->mtu = bs1 - LL_HEADER_LENGTH - 2; priv->channel[READ]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED; priv->channel[WRITE]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED; sprintf(buffer, "%d",priv->buffer_size); DBF_TEXT(trace, 3, buffer); return count; einval: DBF_TEXT(trace, 3, "buff_err"); return -EINVAL; } static ssize_t loglevel_show(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf(buf, "%d\n", loglevel); } static ssize_t loglevel_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int ll1; DBF_TEXT(trace, 5, __FUNCTION__); sscanf(buf, "%i", &ll1); if ((ll1 > CTC_LOGLEVEL_MAX) || (ll1 < 0)) return -EINVAL; loglevel = ll1; return count; } static void ctc_print_statistics(struct ctc_priv *priv) { char *sbuf; char *p; DBF_TEXT(trace, 4, __FUNCTION__); if (!priv) return; sbuf = (char *)kmalloc(2048, GFP_KERNEL); if (sbuf == NULL) return; p = sbuf; p += sprintf(p, " Device FSM state: %s\n", fsm_getstate_str(priv->fsm)); p += sprintf(p, " RX channel FSM state: %s\n", fsm_getstate_str(priv->channel[READ]->fsm)); p += sprintf(p, " TX channel FSM state: %s\n", fsm_getstate_str(priv->channel[WRITE]->fsm)); p += sprintf(p, " Max. TX buffer used: %ld\n", priv->channel[WRITE]->prof.maxmulti); p += sprintf(p, " Max. chained SKBs: %ld\n", priv->channel[WRITE]->prof.maxcqueue); p += sprintf(p, " TX single write ops: %ld\n", priv->channel[WRITE]->prof.doios_single); p += sprintf(p, " TX multi write ops: %ld\n", priv->channel[WRITE]->prof.doios_multi); p += sprintf(p, " Netto bytes written: %ld\n", priv->channel[WRITE]->prof.txlen); p += sprintf(p, " Max. TX IO-time: %ld\n", priv->channel[WRITE]->prof.tx_time); ctc_pr_debug("Statistics for %s:\n%s", priv->channel[WRITE]->netdev->name, sbuf); kfree(sbuf); return; } static ssize_t stats_show(struct device *dev, struct device_attribute *attr, char *buf) { struct ctc_priv *priv = dev->driver_data; if (!priv) return -ENODEV; ctc_print_statistics(priv); return sprintf(buf, "0\n"); } static ssize_t stats_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct ctc_priv *priv = dev->driver_data; if (!priv) return -ENODEV; /* Reset statistics */ memset(&priv->channel[WRITE]->prof, 0, sizeof(priv->channel[WRITE]->prof)); return count; } static void ctc_netdev_unregister(struct net_device * dev) { struct ctc_priv *privptr; if (!dev) return; privptr = (struct ctc_priv *) dev->priv; if (privptr->protocol != CTC_PROTO_LINUX_TTY) unregister_netdev(dev); else ctc_tty_unregister_netdev(dev); } static int ctc_netdev_register(struct net_device * dev) { struct ctc_priv *privptr = (struct ctc_priv *) dev->priv; if (privptr->protocol != CTC_PROTO_LINUX_TTY) return register_netdev(dev); else return ctc_tty_register_netdev(dev); } static void ctc_free_netdevice(struct net_device * dev, int free_dev) { struct ctc_priv *privptr; if (!dev) return; privptr = dev->priv; if (privptr) { if (privptr->fsm) kfree_fsm(privptr->fsm); kfree(privptr); } #ifdef MODULE if (free_dev) free_netdev(dev); #endif } static ssize_t ctc_proto_show(struct device *dev, struct device_attribute *attr, char *buf) { struct ctc_priv *priv; priv = dev->driver_data; if (!priv) return -ENODEV; return sprintf(buf, "%d\n", priv->protocol); } static ssize_t ctc_proto_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct ctc_priv *priv; int value; DBF_TEXT(trace, 3, __FUNCTION__); pr_debug("%s() called\n", __FUNCTION__); priv = dev->driver_data; if (!priv) return -ENODEV; sscanf(buf, "%u", &value); if ((value < 0) || (value > CTC_PROTO_MAX)) return -EINVAL; priv->protocol = value; return count; } static ssize_t ctc_type_show(struct device *dev, struct device_attribute *attr, char *buf) { struct ccwgroup_device *cgdev; cgdev = to_ccwgroupdev(dev); if (!cgdev) return -ENODEV; return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]); } static DEVICE_ATTR(buffer, 0644, buffer_show, buffer_write); static DEVICE_ATTR(protocol, 0644, ctc_proto_show, ctc_proto_store); static DEVICE_ATTR(type, 0444, ctc_type_show, NULL); static DEVICE_ATTR(loglevel, 0644, loglevel_show, loglevel_write); static DEVICE_ATTR(stats, 0644, stats_show, stats_write); static struct attribute *ctc_attr[] = { &dev_attr_protocol.attr, &dev_attr_type.attr, &dev_attr_buffer.attr, NULL, }; static struct attribute_group ctc_attr_group = { .attrs = ctc_attr, }; static int ctc_add_attributes(struct device *dev) { device_create_file(dev, &dev_attr_loglevel); device_create_file(dev, &dev_attr_stats); return 0; } static void ctc_remove_attributes(struct device *dev) { device_remove_file(dev, &dev_attr_stats); device_remove_file(dev, &dev_attr_loglevel); } static int ctc_add_files(struct device *dev) { pr_debug("%s() called\n", __FUNCTION__); return sysfs_create_group(&dev->kobj, &ctc_attr_group); } static void ctc_remove_files(struct device *dev) { pr_debug("%s() called\n", __FUNCTION__); sysfs_remove_group(&dev->kobj, &ctc_attr_group); } /** * Add ctc specific attributes. * Add ctc private data. * * @param cgdev pointer to ccwgroup_device just added * * @returns 0 on success, !0 on failure. */ static int ctc_probe_device(struct ccwgroup_device *cgdev) { struct ctc_priv *priv; int rc; char buffer[16]; pr_debug("%s() called\n", __FUNCTION__); DBF_TEXT(setup, 3, __FUNCTION__); if (!get_device(&cgdev->dev)) return -ENODEV; priv = kmalloc(sizeof (struct ctc_priv), GFP_KERNEL); if (!priv) { ctc_pr_err("%s: Out of memory\n", __func__); put_device(&cgdev->dev); return -ENOMEM; } memset(priv, 0, sizeof (struct ctc_priv)); rc = ctc_add_files(&cgdev->dev); if (rc) { kfree(priv); put_device(&cgdev->dev); return rc; } priv->buffer_size = CTC_BUFSIZE_DEFAULT; cgdev->cdev[0]->handler = ctc_irq_handler; cgdev->cdev[1]->handler = ctc_irq_handler; cgdev->dev.driver_data = priv; sprintf(buffer, "%p", priv); DBF_TEXT(data, 3, buffer); sprintf(buffer, "%u", (unsigned int)sizeof(struct ctc_priv)); DBF_TEXT(data, 3, buffer); sprintf(buffer, "%p", &channels); DBF_TEXT(data, 3, buffer); sprintf(buffer, "%u", (unsigned int)sizeof(struct channel)); DBF_TEXT(data, 3, buffer); return 0; } /** * Initialize everything of the net device except the name and the * channel structs. */ static struct net_device * ctc_init_netdevice(struct net_device * dev, int alloc_device, struct ctc_priv *privptr) { if (!privptr) return NULL; DBF_TEXT(setup, 3, __FUNCTION__); if (alloc_device) { dev = kmalloc(sizeof (struct net_device), GFP_KERNEL); if (!dev) return NULL; memset(dev, 0, sizeof (struct net_device)); } dev->priv = privptr; privptr->fsm = init_fsm("ctcdev", dev_state_names, dev_event_names, CTC_NR_DEV_STATES, CTC_NR_DEV_EVENTS, dev_fsm, DEV_FSM_LEN, GFP_KERNEL); if (privptr->fsm == NULL) { if (alloc_device) kfree(dev); return NULL; } fsm_newstate(privptr->fsm, DEV_STATE_STOPPED); fsm_settimer(privptr->fsm, &privptr->restart_timer); if (dev->mtu == 0) dev->mtu = CTC_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2; dev->hard_start_xmit = ctc_tx; dev->open = ctc_open; dev->stop = ctc_close; dev->get_stats = ctc_stats; dev->change_mtu = ctc_change_mtu; dev->hard_header_len = LL_HEADER_LENGTH + 2; dev->addr_len = 0; dev->type = ARPHRD_SLIP; dev->tx_queue_len = 100; dev->flags = IFF_POINTOPOINT | IFF_NOARP; SET_MODULE_OWNER(dev); return dev; } /** * * Setup an interface. * * @param cgdev Device to be setup. * * @returns 0 on success, !0 on failure. */ static int ctc_new_device(struct ccwgroup_device *cgdev) { char read_id[CTC_ID_SIZE]; char write_id[CTC_ID_SIZE]; int direction; enum channel_types type; struct ctc_priv *privptr; struct net_device *dev; int ret; char buffer[16]; pr_debug("%s() called\n", __FUNCTION__); DBF_TEXT(setup, 3, __FUNCTION__); privptr = cgdev->dev.driver_data; if (!privptr) return -ENODEV; sprintf(buffer, "%d", privptr->buffer_size); DBF_TEXT(setup, 3, buffer); type = get_channel_type(&cgdev->cdev[0]->id); snprintf(read_id, CTC_ID_SIZE, "ch-%s", cgdev->cdev[0]->dev.bus_id); snprintf(write_id, CTC_ID_SIZE, "ch-%s", cgdev->cdev[1]->dev.bus_id); if (add_channel(cgdev->cdev[0], type)) return -ENOMEM; if (add_channel(cgdev->cdev[1], type)) return -ENOMEM; ret = ccw_device_set_online(cgdev->cdev[0]); if (ret != 0) { printk(KERN_WARNING "ccw_device_set_online (cdev[0]) failed with ret = %d\n", ret); } ret = ccw_device_set_online(cgdev->cdev[1]); if (ret != 0) { printk(KERN_WARNING "ccw_device_set_online (cdev[1]) failed with ret = %d\n", ret); } dev = ctc_init_netdevice(NULL, 1, privptr); if (!dev) { ctc_pr_warn("ctc_init_netdevice failed\n"); goto out; } if (privptr->protocol == CTC_PROTO_LINUX_TTY) strlcpy(dev->name, "ctctty%d", IFNAMSIZ); else strlcpy(dev->name, "ctc%d", IFNAMSIZ); for (direction = READ; direction <= WRITE; direction++) { privptr->channel[direction] = channel_get(type, direction == READ ? read_id : write_id, direction); if (privptr->channel[direction] == NULL) { if (direction == WRITE) channel_free(privptr->channel[READ]); ctc_free_netdevice(dev, 1); goto out; } privptr->channel[direction]->netdev = dev; privptr->channel[direction]->protocol = privptr->protocol; privptr->channel[direction]->max_bufsize = privptr->buffer_size; } /* sysfs magic */ SET_NETDEV_DEV(dev, &cgdev->dev); if (ctc_netdev_register(dev) != 0) { ctc_free_netdevice(dev, 1); goto out; } ctc_add_attributes(&cgdev->dev); strlcpy(privptr->fsm->name, dev->name, sizeof (privptr->fsm->name)); print_banner(); ctc_pr_info("%s: read: %s, write: %s, proto: %d\n", dev->name, privptr->channel[READ]->id, privptr->channel[WRITE]->id, privptr->protocol); return 0; out: ccw_device_set_offline(cgdev->cdev[1]); ccw_device_set_offline(cgdev->cdev[0]); return -ENODEV; } /** * Shutdown an interface. * * @param cgdev Device to be shut down. * * @returns 0 on success, !0 on failure. */ static int ctc_shutdown_device(struct ccwgroup_device *cgdev) { struct ctc_priv *priv; struct net_device *ndev; DBF_TEXT(setup, 3, __FUNCTION__); pr_debug("%s() called\n", __FUNCTION__); priv = cgdev->dev.driver_data; ndev = NULL; if (!priv) return -ENODEV; if (priv->channel[READ]) { ndev = priv->channel[READ]->netdev; /* Close the device */ ctc_close(ndev); ndev->flags &=~IFF_RUNNING; ctc_remove_attributes(&cgdev->dev); channel_free(priv->channel[READ]); } if (priv->channel[WRITE]) channel_free(priv->channel[WRITE]); if (ndev) { ctc_netdev_unregister(ndev); ndev->priv = NULL; ctc_free_netdevice(ndev, 1); } if (priv->fsm) kfree_fsm(priv->fsm); ccw_device_set_offline(cgdev->cdev[1]); ccw_device_set_offline(cgdev->cdev[0]); if (priv->channel[READ]) channel_remove(priv->channel[READ]); if (priv->channel[WRITE]) channel_remove(priv->channel[WRITE]); priv->channel[READ] = priv->channel[WRITE] = NULL; return 0; } static void ctc_remove_device(struct ccwgroup_device *cgdev) { struct ctc_priv *priv; pr_debug("%s() called\n", __FUNCTION__); DBF_TEXT(setup, 3, __FUNCTION__); priv = cgdev->dev.driver_data; if (!priv) return; if (cgdev->state == CCWGROUP_ONLINE) ctc_shutdown_device(cgdev); ctc_remove_files(&cgdev->dev); cgdev->dev.driver_data = NULL; kfree(priv); put_device(&cgdev->dev); } static struct ccwgroup_driver ctc_group_driver = { .owner = THIS_MODULE, .name = "ctc", .max_slaves = 2, .driver_id = 0xC3E3C3, .probe = ctc_probe_device, .remove = ctc_remove_device, .set_online = ctc_new_device, .set_offline = ctc_shutdown_device, }; /** * Module related routines *****************************************************************************/ /** * Prepare to be unloaded. Free IRQ's and release all resources. * This is called just before this module is unloaded. It is * <em>not</em> called, if the usage count is !0, so we don't need to check * for that. */ static void __exit ctc_exit(void) { DBF_TEXT(setup, 3, __FUNCTION__); unregister_cu3088_discipline(&ctc_group_driver); ctc_tty_cleanup(); ctc_unregister_dbf_views(); ctc_pr_info("CTC driver unloaded\n"); } /** * Initialize module. * This is called just after the module is loaded. * * @return 0 on success, !0 on error. */ static int __init ctc_init(void) { int ret = 0; loglevel = CTC_LOGLEVEL_DEFAULT; DBF_TEXT(setup, 3, __FUNCTION__); print_banner(); ret = ctc_register_dbf_views(); if (ret){ ctc_pr_crit("ctc_init failed with ctc_register_dbf_views rc = %d\n", ret); return ret; } ctc_tty_init(); ret = register_cu3088_discipline(&ctc_group_driver); if (ret) { ctc_tty_cleanup(); ctc_unregister_dbf_views(); } return ret;