1 // vim: ts=4 sw=4 noet :
3 ==================================================================================
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5 Copyright (c) 2018-2020 AT&T Intellectual Property.
7 Licensed under the Apache License, Version 2.0 (the "License");
8 you may not use this file except in compliance with the License.
9 You may obtain a copy of the License at
11 http://www.apache.org/licenses/LICENSE-2.0
13 Unless required by applicable law or agreed to in writing, software
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15 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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18 ==================================================================================
22 Mnemonic: sr_si_static.c
23 Abstract: These are static send/receive primatives which (sadly)
24 differ based on the underlying protocol (nng vs SI95).
25 Split from rmr_nng.c for easier wormhole support.
27 Author: E. Scott Daniels
28 Date: 13 February 2019
31 #ifndef _sr_si_static_c
32 #define _sr_si_static_c
34 static void dump_40( char *p, char* label ) {
38 fprintf( stderr, ">>>>> %s p=%p\n", label, p );
40 for( i = 0; i < 40; i++ ) {
41 fprintf( stderr, "%02x ", (unsigned char) *(p+i) );
43 fprintf( stderr, "\n" );
47 Translates the nng state passed in to one of ours that is suitable to put
48 into the message, and sets errno to something that might be useful.
49 If we don't have a specific RMr state, then we return the default (e.g.
52 The addition of the connection shut error code to the switch requires
53 that the NNG version at commit e618abf8f3db2a94269a (or after) be
54 used for compiling RMR.
56 static inline int xlate_si_state( int state, int def_state ) {
95 Alloc a new nano zero copy buffer and put into msg. If msg is nil, then we will alloc
96 a new message struct as well. Size is the size of the zc buffer to allocate (not
97 including our header). If size is 0, then the buffer allocated is the size previously
98 allocated (if msg is !nil) or the default size given at initialisation).
100 The trlo (trace data lengh override) is used for trace length if >0. If <= 0, then
101 the context value is used.
103 NOTE: while accurate, the nng doc implies that both the msg buffer and data buffer
104 are zero copy, however ONLY the message is zero copy. We now allocate and use
107 static rmr_mbuf_t* alloc_zcmsg( uta_ctx_t* ctx, rmr_mbuf_t* msg, int size, int state, int trlo ) {
108 size_t mlen = -1; // size of the transport buffer that we'll allocate
109 uta_mhdr_t* hdr; // convenience pointer
110 int tr_len; // trace data len (default or override)
111 int* alen; // convenience pointer to set allocated len
113 tr_len = trlo > 0 ? trlo : ctx->trace_data_len;
115 mlen = sizeof( uta_mhdr_t ) + tr_len + ctx->d1_len + ctx->d2_len; // start with header and trace/data lengths
116 mlen += (size > 0 ? size : ctx->max_plen); // add user requested size or size set during init
117 mlen = sizeof( char ) * (mlen + TP_HDR_LEN); // finally add the transport header len
119 if( msg == NULL && (msg = (rmr_mbuf_t *) uta_ring_extract( ctx->zcb_mring )) == NULL ) {
120 msg = (rmr_mbuf_t *) malloc( sizeof *msg );
122 rmr_vlog( RMR_VL_CRIT, "rmr_alloc_zc: cannot get memory for message\n" );
123 return NULL; // we used to exit -- that seems wrong
125 memset( msg, 0, sizeof( *msg ) ); // tp_buffer will be allocated below
126 } else { // user message or message from the ring
127 if( mlen > msg->alloc_len ) { // current allocation is too small
128 msg->alloc_len = 0; // force tp_buffer realloc below
133 mlen = msg->alloc_len; // msg given, allocate the same size as before
137 msg->rts_fd = -1; // must force to be invalid; not a received message that can be returned
139 if( !msg->alloc_len && (msg->tp_buf = (void *) malloc( mlen )) == NULL ) {
140 rmr_vlog( RMR_VL_CRIT, "rmr_alloc_zc: cannot get memory for zero copy buffer: %d bytes\n", (int) mlen );
141 abort( ); // toss out a core file for this
145 memset( msg->tp_buf, 0, mlen ); // NOT for production (debug only) valgrind will complain about uninitalised use if we don't set
146 memcpy( msg->tp_buf, "@@!!@@!!@@!!@@!!@@!!@@!!@@!!@@!!**", TPHDR_LEN ); // NOT for production -- debugging eyecatcher
148 alen = (int *) msg->tp_buf;
149 *alen = mlen; // FIX ME: need a stuct to go in these first bytes, not just dummy len
151 msg->header = ((char *) msg->tp_buf) + TP_HDR_LEN;
152 memset( msg->header, 0, sizeof( uta_mhdr_t ) ); // ensure no junk in the header area
153 if( (hdr = (uta_mhdr_t *) msg->header) != NULL ) {
154 hdr->rmr_ver = htonl( RMR_MSG_VER ); // set current version
155 hdr->sub_id = htonl( UNSET_SUBID );
156 SET_HDR_LEN( hdr ); // ensure these are converted to net byte order
157 SET_HDR_TR_LEN( hdr, ctx->trace_data_len );
158 SET_HDR_D1_LEN( hdr, ctx->d1_len );
159 //SET_HDR_D2_LEN( hdr, ctx->d2_len ); // future
161 msg->len = 0; // length of data in the payload
162 msg->cookie = 0x4942;
163 msg->alloc_len = mlen; // length of allocated transport buffer (caller size + rmr header)
164 msg->sub_id = UNSET_SUBID;
165 msg->mtype = UNSET_MSGTYPE;
166 msg->payload = PAYLOAD_ADDR( hdr ); // point to payload (past all header junk)
167 msg->xaction = ((uta_mhdr_t *)msg->header)->xid; // point at transaction id in header area
168 msg->state = state; // fill in caller's state (likely the state of the last operation)
169 msg->flags |= MFL_ZEROCOPY; // this is a zerocopy sendable message
170 msg->ring = ctx->zcb_mring; // original msg_free() api doesn't get context so must dup on eaach :(
171 strncpy( (char *) ((uta_mhdr_t *)msg->header)->src, ctx->my_name, RMR_MAX_SRC );
172 strncpy( (char *) ((uta_mhdr_t *)msg->header)->srcip, ctx->my_ip, RMR_MAX_SRC );
174 if( DEBUG > 1 ) rmr_vlog( RMR_VL_DEBUG, "alloc_zcmsg mlen=%ld size=%d mpl=%d flags=%02x\n", (long) mlen, size, ctx->max_plen, msg->flags );
180 Allocates only the mbuf and does NOT allocate an underlying transport buffer since
181 transport receive should allocate that on its own.
183 static rmr_mbuf_t* alloc_mbuf( uta_ctx_t* ctx, int state ) {
185 uta_mhdr_t* hdr; // convenience pointer
188 if( (msg = (rmr_mbuf_t *) uta_ring_extract( ctx->zcb_mring )) != NULL ) {
190 free( msg->tp_buf ); // caller doesn't want it -- future put this on an accumulation ring
193 if( (msg = (rmr_mbuf_t *) malloc( sizeof *msg )) == NULL ) {
194 rmr_vlog( RMR_VL_CRIT, "rmr_alloc_mbuf: cannot get memory for message\n" );
195 return NULL; // this used to exit, but that seems wrong
199 memset( msg, 0, sizeof( *msg ) );
201 msg->cookie = 0x4942;
202 msg->sub_id = UNSET_SUBID;
203 msg->mtype = UNSET_MSGTYPE;
206 msg->len = -1; // no payload; invalid len
212 msg->ring = ctx->zcb_mring; // original msg_free() api doesn't get context so must dup on eaach :(
218 This accepts a message with the assumption that only the tp_buf pointer is valid. It
219 sets all of the various header/payload/xaction pointers in the mbuf to the proper
220 spot in the transport layer buffer. The len in the header is assumed to be the
221 allocated len (a receive buffer that nng created);
223 The alen parm is the assumed allocated length; assumed because it's a value likely
224 to have come from si receive and the actual alloc len might be larger, but we
225 can only assume this is the total usable space. Because we are managing a transport
226 header in the first n bytes of the real msg, we must adjust this length down by the
227 size of the tp header (for testing 50 bytes, but this should change to a struct if
228 we adopt this interface).
230 This function returns the message with an error state set if it detects that the
231 received message might have been truncated. Check is done here as the calculation
232 is somewhat based on header version.
234 static void ref_tpbuf( rmr_mbuf_t* msg, size_t alen ) {
235 uta_mhdr_t* hdr = NULL; // current header
236 uta_v1mhdr_t* v1hdr; // version 1 header
238 int hlen; // header len to use for a truncation check
240 msg->header = ((char *) msg->tp_buf) + TP_HDR_LEN;
242 v1hdr = (uta_v1mhdr_t *) msg->header; // v1 will always allow us to suss out the version
244 if( v1hdr->rmr_ver == 1 ) { // bug in verion 1 didn't encode the version in network byte order
246 v1hdr->rmr_ver = htonl( 1 ); // save it correctly in case we clone the message
248 ver = ntohl( v1hdr->rmr_ver );
253 msg->len = ntohl( v1hdr->plen ); // length sender says is in the payload (received length could be larger)
254 msg->alloc_len = alen; // length of whole tp buffer (including header, trace and data bits)
255 msg->payload = msg->header + sizeof( uta_v1mhdr_t ); // point past header to payload (single buffer allocation above)
257 msg->xaction = &v1hdr->xid[0]; // point at transaction id in header area
258 msg->flags |= MFL_ZEROCOPY; // this is a zerocopy sendable message
259 msg->mtype = ntohl( v1hdr->mtype ); // capture and convert from network order to local order
260 msg->sub_id = UNSET_SUBID; // type 1 messages didn't have this
262 hlen = sizeof( uta_v1mhdr_t );
265 default: // current version always lands here
266 hdr = (uta_mhdr_t *) msg->header;
267 msg->len = ntohl( hdr->plen ); // length sender says is in the payload (received length could be larger)
268 msg->alloc_len = alen; // length of whole tp buffer (including header, trace and data bits)
270 msg->payload = PAYLOAD_ADDR( hdr ); // at user payload
271 msg->xaction = &hdr->xid[0]; // point at transaction id in header area
272 msg->flags |= MFL_ZEROCOPY; // this is a zerocopy sendable message
273 msg->mtype = ntohl( hdr->mtype ); // capture and convert from network order to local order
274 msg->sub_id = ntohl( hdr->sub_id );
275 hlen = RMR_HDR_LEN( hdr ); // len to use for truncated check later
279 if( msg->len > (msg->alloc_len - hlen ) ) {
280 msg->state = RMR_ERR_TRUNC;
281 msg->len = msg->alloc_len - hlen; // adjust len down so user app doesn't overrun
288 This will clone a message into a new zero copy buffer and return the cloned message.
290 static inline rmr_mbuf_t* clone_msg( rmr_mbuf_t* old_msg ) {
291 rmr_mbuf_t* nm; // new message buffer
297 nm = (rmr_mbuf_t *) malloc( sizeof *nm );
299 rmr_vlog( RMR_VL_CRIT, "rmr_clone: cannot get memory for message buffer\n" );
302 memset( nm, 0, sizeof( *nm ) );
304 mlen = old_msg->alloc_len; // length allocated before
305 if( (nm->tp_buf = (void *) malloc( sizeof( char ) * (mlen + TP_HDR_LEN) )) == NULL ) {
306 rmr_vlog( RMR_VL_CRIT, "rmr_si_clone: cannot get memory for zero copy buffer: %d\n", (int) mlen );
310 nm->header = ((char *) nm->tp_buf) + TP_HDR_LEN;
311 v1hdr = (uta_v1mhdr_t *) old_msg->header; // v1 will work to dig header out of any version
312 switch( ntohl( v1hdr->rmr_ver ) ) {
314 memcpy( v1hdr, old_msg->header, sizeof( *v1hdr ) ); // copy complete header
315 nm->payload = (void *) v1hdr + sizeof( *v1hdr );
318 default: // current message always caught here
320 memcpy( hdr, old_msg->header, RMR_HDR_LEN( old_msg->header ) + RMR_TR_LEN( old_msg->header ) + RMR_D1_LEN( old_msg->header ) + RMR_D2_LEN( old_msg->header )); // copy complete header, trace and other data
321 nm->payload = PAYLOAD_ADDR( hdr ); // at user payload
325 // --- these are all version agnostic -----------------------------------
326 nm->mtype = old_msg->mtype;
327 nm->sub_id = old_msg->sub_id;
328 nm->len = old_msg->len; // length of data in the payload
329 nm->alloc_len = mlen; // length of allocated payload
331 nm->xaction = hdr->xid; // reference xaction
332 nm->state = old_msg->state; // fill in caller's state (likely the state of the last operation)
333 nm->flags = old_msg->flags | MFL_ZEROCOPY; // this is a zerocopy sendable message
334 memcpy( nm->payload, old_msg->payload, old_msg->len );
340 This will clone a message with a change to the trace area in the header such that
341 it will be tr_len passed in. The trace area in the cloned message will be uninitialised.
342 The orignal message will be left unchanged, and a pointer to the new message is returned.
343 It is not possible to realloc buffers and change the data sizes.
345 static inline rmr_mbuf_t* realloc_msg( rmr_mbuf_t* old_msg, int tr_len ) {
346 rmr_mbuf_t* nm; // new message buffer
351 int tr_old_len; // tr size in new buffer
352 int* alen; // convenience pointer to set toal xmit len FIX ME!
353 int tpb_len; // total transmit buffer len (user space, rmr header and tp header)
355 nm = (rmr_mbuf_t *) malloc( sizeof *nm );
357 rmr_vlog( RMR_VL_CRIT, "rmr_clone: cannot get memory for message buffer\n" );
360 memset( nm, 0, sizeof( *nm ) );
362 hdr = old_msg->header;
363 tr_old_len = RMR_TR_LEN( hdr ); // bytes in old header for trace
365 mlen = old_msg->alloc_len + (tr_len - tr_old_len); // new length with trace adjustment
366 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "tr_realloc old size=%d new size=%d new tr_len=%d\n", (int) old_msg->alloc_len, (int) mlen, (int) tr_len );
368 tpb_len = mlen + TP_HDR_LEN;
369 if( (nm->tp_buf = (void *) malloc( tpb_len)) == NULL ) {
370 rmr_vlog( RMR_VL_CRIT, "rmr_clone: cannot get memory for zero copy buffer: %d\n", ENOMEM );
373 memset( nm->tp_buf, 0, tpb_len );
374 memcpy( nm->tp_buf, "@@!!@@!!@@!!@@!!@@!!@@!!@@!!@@!!**", 34 ); // DEBUGGING
375 alen = (int *) nm->tp_buf;
376 *alen = tpb_len; // FIX ME: need a stuct to go in these first bytes, not just dummy len
378 nm->header = ((char *) nm->tp_buf) + TP_HDR_LEN;
380 v1hdr = (uta_v1mhdr_t *) old_msg->header; // v1 will work to dig header out of any version
381 switch( ntohl( v1hdr->rmr_ver ) ) {
383 memcpy( v1hdr, old_msg->header, sizeof( *v1hdr ) ); // copy complete header
384 nm->payload = (void *) v1hdr + sizeof( *v1hdr );
387 default: // current message version always caught here
389 memcpy( hdr, old_msg->header, sizeof( uta_mhdr_t ) ); // ONLY copy the header portion; trace and data offsets might have changed
390 SET_HDR_TR_LEN( hdr, tr_len ); // must adjust trace len in new message before copy
392 if( RMR_D1_LEN( hdr ) ) {
393 memcpy( DATA1_ADDR( hdr ), DATA1_ADDR( old_msg->header), RMR_D1_LEN( hdr ) ); // copy data1 and data2 if necessary
395 if( RMR_D2_LEN( hdr ) ) {
396 memcpy( DATA2_ADDR( hdr ), DATA2_ADDR( old_msg->header), RMR_D2_LEN( hdr ) );
399 nm->payload = PAYLOAD_ADDR( hdr ); // directly at the payload
403 // --- these are all version agnostic -----------------------------------
404 nm->mtype = old_msg->mtype;
405 nm->sub_id = old_msg->sub_id;
406 nm->len = old_msg->len; // length of data in the payload
407 nm->alloc_len = mlen; // length of allocated payload
409 nm->xaction = hdr->xid; // reference xaction
410 nm->state = old_msg->state; // fill in caller's state (likely the state of the last operation)
411 nm->flags = old_msg->flags | MFL_ZEROCOPY; // this is a zerocopy sendable message
412 memcpy( nm->payload, old_msg->payload, old_msg->len );
418 Realloc the message such that the payload is at least payload_len bytes.
419 The clone and copy options affect what portion of the original payload is copied to
420 the reallocated message, and whether or not the original payload is lost after the
421 reallocation process has finished.
424 The entire payload from the original message will be coppied to the reallocated
428 Only the header (preserving return to sender information, message type, etc)
429 is preserved after reallocation; the payload used lengrh is set to 0 and the
430 payload is NOT initialised/cleared.
433 The orignal message is preserved and a completely new message buffer and payload
434 are allocated (even if the size given is the same). A pointer to the new message
435 buffer is returned and it is the user application's responsibility to manage the
436 old buffer (e.g. free when not needed).
439 The old payload will be lost after reallocation. The message buffer pointer which
440 is returned will likely reference the same structure (don't depend on that).
444 If the message is not a message which was received, the mtype, sub-id, length values in the
445 RMR header in the allocated transport buffer will NOT be accurate and will cause the resulting
446 mbuffer information for mtype and subid to be reset even when copy is true. To avoid silently
447 resetting information in the mbuffer, this funciton will reset the mbuf values from the current
448 settings and NOT from the copied RMR header in transport buffer.
450 static inline rmr_mbuf_t* realloc_payload( rmr_mbuf_t* old_msg, int payload_len, int copy, int clone ) {
451 rmr_mbuf_t* nm = NULL; // new message buffer when cloning
453 uta_mhdr_t* omhdr; // old message header
454 int tr_old_len; // tr size in new buffer
455 int old_psize = 0; // size of payload in the message passed in (alloc size - tp header and rmr header lengths)
456 int hdr_len = 0; // length of RMR and transport headers in old msg
457 void* old_tp_buf; // pointer to the old tp buffer
458 int free_tp = 1; // free the transport buffer (old) when done (when not cloning)
459 int old_mt; // msg type and sub-id from the message passed in
462 int old_rfd; // rts file descriptor from old message
464 if( old_msg == NULL || payload_len <= 0 ) {
469 old_mt = old_msg->mtype; // preserve mbuf info
470 old_sid = old_msg->sub_id;
471 old_len = old_msg->len;
472 old_rfd = old_msg->rts_fd;
474 old_psize = old_msg->alloc_len - (RMR_HDR_LEN( old_msg->header ) + TP_HDR_LEN); // user payload size in orig message
476 if( !clone && payload_len <= old_psize ) { // not cloning and old is large enough; nothing to do
477 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "rmr_realloc_payload: old msg payload larger than requested: cur=%d need=%d\n", old_psize, payload_len );
481 hdr_len = RMR_HDR_LEN( old_msg->header ) + TP_HDR_LEN; // with SI we manage the transport header; must include in len
482 old_tp_buf = old_msg->tp_buf;
485 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "rmr_realloc_payload: cloning message\n" );
488 nm = (rmr_mbuf_t *) malloc( sizeof( *nm ) );
490 rmr_vlog( RMR_VL_CRIT, "rmr_realloc_payload: cannot get memory for message buffer. bytes requested: %d\n", (int) sizeof(*nm) );
493 memset( nm, 0, sizeof( *nm ) );
494 nm->rts_fd = old_rfd; // this is managed only in the mbuf; dup now
499 omhdr = old_msg->header;
500 mlen = hdr_len + (payload_len > old_psize ? payload_len : old_psize); // must have larger in case copy is true
502 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "reallocate for payload increase. new message size: %d\n", (int) mlen );
503 if( (nm->tp_buf = (char *) malloc( sizeof( char ) * mlen )) == NULL ) {
504 rmr_vlog( RMR_VL_CRIT, "rmr_realloc_payload: cannot get memory for zero copy buffer. bytes requested: %d\n", (int) mlen );
508 nm->header = ((char *) nm->tp_buf) + TP_HDR_LEN; // point at the new header and copy from old
509 SET_HDR_LEN( nm->header );
511 if( copy ) { // if we need to copy the old payload too
512 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "rmr_realloc_payload: copy payload into new message: %d bytes\n", old_psize );
513 memcpy( nm->header, omhdr, sizeof( char ) * (old_psize + RMR_HDR_LEN( omhdr )) );
514 } else { // just need to copy header
515 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "rmr_realloc_payload: copy only header into new message: %d bytes\n", RMR_HDR_LEN( nm->header ) );
516 memcpy( nm->header, omhdr, sizeof( char ) * RMR_HDR_LEN( omhdr ) );
519 ref_tpbuf( nm, mlen ); // set payload and other pointers in the message to the new tp buffer
522 nm->mtype = -1; // didn't copy payload, so mtype, sub-id, and rts fd are invalid
524 nm->len = 0; // and len is 0
526 nm->len = old_len; // we must force these to avoid losing info if msg wasn't a received message
528 nm->sub_id = old_sid;
532 free( old_tp_buf ); // we did not clone, so free b/c no references
539 For SI95 based transport all receives are driven through the threaded
540 ring and thus this function should NOT be called. If it is we will panic
541 and abort straight away.
543 static rmr_mbuf_t* rcv_msg( uta_ctx_t* ctx, rmr_mbuf_t* old_msg ) {
545 fprintf( stderr, "\n\n>>> rcv_msg: bad things just happened!\n\n>>>>>> abort! rcv_msg called and it shouldn't be\n" );
552 This does the hard work of actually sending the message to the given socket. On success,
553 a new message struct is returned. On error, the original msg is returned with the state
554 set to a reasonable value. If the message being sent as MFL_NOALLOC set, then a new
555 buffer will not be allocated and returned (mostly for call() interal processing since
556 the return message from call() is a received buffer, not a new one).
558 Called by rmr_send_msg() and rmr_rts_msg(), etc. and thus we assume that all pointer
559 validation has been done prior.
561 When msg->state is not ok, this function must set tp_state in the message as some API
562 fucntions return the message directly and do not propigate errno into the message.
564 static rmr_mbuf_t* send_msg( uta_ctx_t* ctx, rmr_mbuf_t* msg, int nn_sock, int retries ) {
567 int spin_retries = 1000; // if eagain/timeout we'll spin, at max, this many times before giving up the CPU
568 int tr_len; // trace len in sending message so we alloc new message with same trace sizes
569 int tot_len; // total send length (hdr + user data + tp header)
571 // future: ensure that application did not overrun the XID buffer; last byte must be 0
573 hdr = (uta_mhdr_t *) msg->header;
574 hdr->mtype = htonl( msg->mtype ); // stash type/len/sub_id in network byte order for transport
575 hdr->sub_id = htonl( msg->sub_id );
576 hdr->plen = htonl( msg->len );
577 tr_len = RMR_TR_LEN( hdr ); // snarf trace len before sending as hdr is invalid after send
579 if( msg->flags & MFL_ADDSRC ) { // buffer was allocated as a receive buffer; must add our source
580 strncpy( (char *) ((uta_mhdr_t *)msg->header)->src, ctx->my_name, RMR_MAX_SRC ); // must overlay the source to be ours
581 strncpy( (char *) ((uta_mhdr_t *)msg->header)->srcip, ctx->my_ip, RMR_MAX_SRC );
592 tot_len = msg->len + PAYLOAD_OFFSET( hdr ) + TP_HDR_LEN; // we only send what was used + header lengths
593 if( tot_len > msg->alloc_len ) {
594 tot_len = msg->alloc_len; // likely bad length from user :(
596 *((int*) msg->tp_buf) = tot_len;
598 if( DEBUG > 1 ) rmr_vlog( RMR_VL_DEBUG, "send_msg: ending %d (%x) bytes usr_len=%d alloc=%d retries=%d\n", tot_len, tot_len, msg->len, msg->alloc_len, retries );
599 if( DEBUG > 2 ) dump_40( msg->tp_buf, "sending" );
601 if( (state = SIsendt( ctx->si_ctx, nn_sock, msg->tp_buf, tot_len )) != SI_OK ) {
602 if( DEBUG > 1 ) rmr_vlog( RMR_VL_DEBUG, "send_msg: error!! sent state=%d\n", state );
604 if( retries > 0 && state == SI_ERR_BLOCKED ) {
605 if( --spin_retries <= 0 ) { // don't give up the processor if we don't have to
607 if( retries > 0 ) { // only if we'll loop through again
608 usleep( 1 ); // sigh, give up the cpu and hope it's just 1 miscrosec
613 state = 0; // don't loop
616 if( DEBUG > 2 ) rmr_vlog( RMR_VL_DEBUG, "sent OK state=%d\n", state );
621 } while( state && retries > 0 );
623 if( msg->state == RMR_OK ) { // successful send
624 if( !(msg->flags & MFL_NOALLOC) ) { // allocate another sendable zc buffer unless told otherwise
625 return alloc_zcmsg( ctx, msg, 0, RMR_OK, tr_len ); // preallocate a zero-copy buffer and return msg
627 rmr_free_msg( msg ); // not wanting a meessage back, trash this one
630 } else { // send failed -- return original message
631 if( msg->state == 98 ) { // FIX ME: this is just broken, but needs SI changes to work correctly for us
633 msg->state = RMR_ERR_RETRY; // errno will have nano reason
635 msg->state = RMR_ERR_SENDFAILED;
638 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "send failed: %d %s\n", (int) msg->state, strerror( msg->state ) );
645 send message with maximum timeout.
646 Accept a message and send it to an endpoint based on message type.
647 If NNG reports that the send attempt timed out, or should be retried,
648 RMr will retry for approximately max_to microseconds; rounded to the next
651 Allocates a new message buffer for the next send. If a message type has
652 more than one group of endpoints defined, then the message will be sent
653 in round robin fashion to one endpoint in each group.
655 An endpoint will be looked up in the route table using the message type and
656 the subscription id. If the subscription id is "UNSET_SUBID", then only the
657 message type is used. If the initial lookup, with a subid, fails, then a
658 second lookup using just the mtype is tried.
660 When msg->state is not OK, this function must set tp_state in the message as
661 some API fucntions return the message directly and do not propigate errno into
664 CAUTION: this is a non-blocking send. If the message cannot be sent, then
665 it will return with an error and errno set to eagain. If the send is
666 a limited fanout, then the returned status is the status of the last
670 static rmr_mbuf_t* mtosend_msg( void* vctx, rmr_mbuf_t* msg, int max_to ) {
671 endpoint_t* ep; // end point that we're attempting to send to
672 rtable_ent_t* rte; // the route table entry which matches the message key
673 int nn_sock; // endpoint socket (fd in si case) for send
675 int group; // selected group to get socket for
676 int send_again; // true if the message must be sent again
677 rmr_mbuf_t* clone_m; // cloned message for an nth send
678 int sock_ok; // got a valid socket from round robin select
680 int ok_sends = 0; // track number of ok sends
682 if( (ctx = (uta_ctx_t *) vctx) == NULL || msg == NULL ) { // bad stuff, bail fast
683 errno = EINVAL; // if msg is null, this is their clue
685 msg->state = RMR_ERR_BADARG;
686 errno = EINVAL; // must ensure it's not eagain
687 msg->tp_state = errno;
692 errno = 0; // clear; nano might set, but ensure it's not left over if it doesn't
693 if( msg->header == NULL ) {
694 fprintf( stderr, "rmr_mtosend_msg: ERROR: message had no header\n" );
695 msg->state = RMR_ERR_NOHDR;
696 errno = EBADMSG; // must ensure it's not eagain
697 msg->tp_state = errno;
702 max_to = ctx->send_retries; // convert to retries
705 if( (rte = uta_get_rte( ctx->rtable, msg->sub_id, msg->mtype, TRUE )) == NULL ) { // find the entry which matches subid/type allow fallback to type only key
706 rmr_vlog( RMR_VL_WARN, "no route table entry for mtype=%d sub_id=%d\n", msg->mtype, msg->sub_id );
707 msg->state = RMR_ERR_NOENDPT;
708 errno = ENXIO; // must ensure it's not eagain
709 msg->tp_state = errno;
710 return msg; // caller can resend (maybe) or free
713 send_again = 1; // force loop entry
714 group = 0; // always start with group 0
715 while( send_again ) {
716 if( rte->nrrgroups > 0 ) { // this is a round robin entry if groups are listed
717 sock_ok = uta_epsock_rr( ctx, rte, group, &send_again, &nn_sock, &ep ); // select endpt from rr group and set again if more groups
719 sock_ok = epsock_meid( ctx, ctx->rtable, msg, &nn_sock, &ep );
723 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "mtosend_msg: flgs=0x%04x type=%d again=%d group=%d len=%d sock_ok=%d\n",
724 msg->flags, msg->mtype, send_again, group, msg->len, sock_ok );
728 if( sock_ok ) { // with an rte we _should_ always have a socket, but don't bet on it
730 clone_m = clone_msg( msg ); // must make a copy as once we send this message is not available
731 if( clone_m == NULL ) {
732 msg->state = RMR_ERR_SENDFAILED;
734 msg->tp_state = errno;
735 rmr_vlog( RMR_VL_WARN, "unable to clone message for multiple rr-group send\n" );
739 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "msg cloned: type=%d len=%d\n", msg->mtype, msg->len );
740 msg->flags |= MFL_NOALLOC; // keep send from allocating a new message; we have a clone to use
741 msg = send_msg( ctx, msg, nn_sock, max_to ); // do the hard work, msg should be nil on success
743 if( msg != NULL ) { // returned message indicates send error of some sort
744 rmr_free_msg( msg ); // must ditchone; pick msg so we don't have to unfiddle flags
748 msg = clone_m; // clone will be the next to send
751 msg = send_msg( ctx, msg, nn_sock, max_to ); // send the last, and allocate a new buffer; drops the clone if it was
754 rmr_vlog( RMR_VL_DEBUG, "mtosend_msg: send returned nil message!\n" );
759 if( ep != NULL && msg != NULL ) {
760 switch( msg->state ) {
762 ep->scounts[EPSC_GOOD]++;
766 ep->scounts[EPSC_TRANS]++;
770 ep->scounts[EPSC_FAIL]++;
771 uta_ep_failed( ep ); // sending to ep failed; set up to reconnect
776 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "invalid socket for rte, setting no endpoint err: mtype=%d sub_id=%d\n", msg->mtype, msg->sub_id );
777 msg->state = RMR_ERR_NOENDPT;
782 if( msg ) { // call functions don't get a buffer back, so a nil check is required
783 msg->flags &= ~MFL_NOALLOC; // must return with this flag off
784 if( ok_sends ) { // multiple rr-groups and one was successful; report ok
788 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "final send stats: ok=%d group=%d state=%d\n", ok_sends, group, msg->state );
790 msg->tp_state = errno;
793 return msg; // last message caries the status of last/only send attempt
798 A generic wrapper to the real send to keep wormhole stuff agnostic.
799 We assume the wormhole function vetted the buffer so we don't have to.
801 static rmr_mbuf_t* send2ep( uta_ctx_t* ctx, endpoint_t* ep, rmr_mbuf_t* msg ) {
802 return send_msg( ctx, msg, ep->nn_sock, -1 );