1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
5 * Memory Descriptor management routines
7 * Copyright (c) 2001-2003 Cluster File Systems, Inc.
8 * Copyright (c) 2001-2002 Sandia National Laboratories
10 * This file is part of Lustre, http://www.sf.net/projects/lustre/
12 * Lustre is free software; you can redistribute it and/or
13 * modify it under the terms of version 2 of the GNU General Public
14 * License as published by the Free Software Foundation.
16 * Lustre is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with Lustre; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 # define DEBUG_SUBSYSTEM S_PORTALS
30 # include <linux/kp30.h>
33 #include <portals/lib-p30.h>
34 #include <portals/arg-blocks.h>
36 /* must be called with state lock held */
37 void lib_md_unlink(nal_cb_t * nal, lib_md_t * md)
39 if ((md->md_flags & PTL_MD_FLAG_ZOMBIE) == 0) {
40 /* first unlink attempt... */
41 lib_me_t *me = md->me;
43 md->md_flags |= PTL_MD_FLAG_ZOMBIE;
45 /* Disassociate from ME (if any), and unlink it if it was created
49 if (me->unlink == PTL_UNLINK)
50 lib_me_unlink(nal, me);
53 /* emsure all future handle lookups fail */
54 lib_invalidate_handle(nal, &md->md_lh);
57 if (md->pending != 0) {
58 CDEBUG(D_NET, "Queueing unlink of md %p\n", md);
62 CDEBUG(D_NET, "Unlinking md %p\n", md);
64 if ((md->options & PTL_MD_KIOV) != 0) {
65 if (nal->cb_unmap_pages != NULL)
66 nal->cb_unmap_pages (nal, md->md_niov, md->md_iov.kiov,
68 } else if (nal->cb_unmap != NULL) {
69 nal->cb_unmap (nal, md->md_niov, md->md_iov.iov,
74 md->eq->eq_refcount--;
75 LASSERT (md->eq->eq_refcount >= 0);
78 list_del (&md->md_list);
82 /* must be called with state lock held */
83 static int lib_md_build(nal_cb_t *nal, lib_md_t *new, void *private,
84 ptl_md_t *md, ptl_handle_eq_t *eqh, int unlink)
91 /* NB we are passed an allocated, but uninitialised/active md.
92 * if we return success, caller may lib_md_unlink() it.
93 * otherwise caller may only lib_md_free() it.
96 if (!PtlHandleIsEqual (*eqh, PTL_EQ_NONE)) {
97 eq = ptl_handle2eq(eqh, nal);
99 return PTL_EQ_INVALID;
102 /* Must check this _before_ allocation. Also, note that non-iov
103 * MDs must set md_niov to 0. */
104 LASSERT((md->options & (PTL_MD_IOVEC | PTL_MD_KIOV)) == 0 ||
105 md->length <= PTL_MD_MAX_IOV);
107 /* This implementation doesn't know how to create START events or
108 * disable END events. Best to LASSERT our caller is compliant so
109 * we find out quickly... */
110 LASSERT (PtlHandleIsEqual (*eqh, PTL_EQ_NONE) ||
111 ((md->options & PTL_MD_EVENT_START_DISABLE) != 0 &&
112 (md->options & PTL_MD_EVENT_END_DISABLE) == 0));
114 if ((md->options & PTL_MD_MAX_SIZE) != 0 && /* max size used */
115 (md->max_size < 0 || md->max_size > md->length)) // illegal max_size
116 return PTL_MD_INVALID;
119 new->start = md->start;
121 new->max_size = md->max_size;
122 new->options = md->options;
123 new->user_ptr = md->user_ptr;
125 new->threshold = md->threshold;
127 new->md_flags = (unlink == PTL_UNLINK) ? PTL_MD_FLAG_AUTO_UNLINK : 0;
129 if ((md->options & PTL_MD_IOVEC) != 0) {
130 int total_length = 0;
132 if ((md->options & PTL_MD_KIOV) != 0) /* Can't specify both */
133 return PTL_MD_INVALID;
135 new->md_niov = niov = md->length;
137 if (nal->cb_read (nal, private, new->md_iov.iov, md->start,
138 niov * sizeof (new->md_iov.iov[0])))
141 for (i = 0; i < niov; i++) {
142 /* We take the base address on trust */
143 if (new->md_iov.iov[i].iov_len <= 0) /* invalid length */
144 return PTL_VAL_FAILED;
146 total_length += new->md_iov.iov[i].iov_len;
149 new->length = total_length;
151 if (nal->cb_map != NULL) {
152 rc = nal->cb_map (nal, niov, new->md_iov.iov,
157 } else if ((md->options & PTL_MD_KIOV) != 0) {
159 return PTL_MD_INVALID;
161 int total_length = 0;
163 /* Trap attempt to use paged I/O if unsupported early. */
164 if (nal->cb_send_pages == NULL ||
165 nal->cb_recv_pages == NULL)
166 return PTL_MD_INVALID;
168 new->md_niov = niov = md->length;
170 if (nal->cb_read (nal, private, new->md_iov.kiov, md->start,
171 niov * sizeof (new->md_iov.kiov[0])))
174 for (i = 0; i < niov; i++) {
175 /* We take the page pointer on trust */
176 if (new->md_iov.kiov[i].kiov_offset +
177 new->md_iov.kiov[i].kiov_len > PAGE_SIZE )
178 return PTL_VAL_FAILED; /* invalid length */
180 total_length += new->md_iov.kiov[i].kiov_len;
183 new->length = total_length;
185 if (nal->cb_map_pages != NULL) {
186 rc = nal->cb_map_pages (nal, niov, new->md_iov.kiov,
192 } else { /* contiguous */
193 new->length = md->length;
194 new->md_niov = niov = 1;
195 new->md_iov.iov[0].iov_base = md->start;
196 new->md_iov.iov[0].iov_len = md->length;
198 if (nal->cb_map != NULL) {
199 rc = nal->cb_map (nal, niov, new->md_iov.iov,
209 /* It's good; let handle2md succeed and add to active mds */
210 lib_initialise_handle (nal, &new->md_lh, PTL_COOKIE_TYPE_MD);
211 list_add (&new->md_list, &nal->ni.ni_active_mds);
216 /* must be called with state lock held */
217 void lib_md_deconstruct(nal_cb_t * nal, lib_md_t * md, ptl_md_t * new)
219 /* NB this doesn't copy out all the iov entries so when a
220 * discontiguous MD is copied out, the target gets to know the
221 * original iov pointer (in start) and the number of entries it had
224 new->start = md->start;
225 new->length = ((md->options & (PTL_MD_IOVEC | PTL_MD_KIOV)) == 0) ?
226 md->length : md->md_niov;
227 new->threshold = md->threshold;
228 new->max_size = md->max_size;
229 new->options = md->options;
230 new->user_ptr = md->user_ptr;
231 ptl_eq2handle(&new->eventq, md->eq);
234 int do_PtlMDAttach(nal_cb_t * nal, void *private, void *v_args, void *v_ret)
238 * ptl_handle_me_t current_in
240 * ptl_unlink_t unlink_in
243 * ptl_handle_md_t * handle_out
246 PtlMDAttach_in *args = v_args;
247 PtlMDAttach_out *ret = v_ret;
252 if ((args->md_in.options & (PTL_MD_KIOV | PTL_MD_IOVEC)) != 0 &&
253 args->md_in.length > PTL_MD_MAX_IOV) /* too many fragments */
254 return (ret->rc = PTL_IOV_INVALID);
256 md = lib_md_alloc(nal, &args->md_in);
258 return (ret->rc = PTL_NO_SPACE);
260 state_lock(nal, &flags);
262 me = ptl_handle2me(&args->me_in, nal);
264 ret->rc = PTL_ME_INVALID;
265 } else if (me->md != NULL) {
266 ret->rc = PTL_ME_IN_USE;
268 ret->rc = lib_md_build(nal, md, private, &args->md_in,
269 &args->eq_in, args->unlink_in);
271 if (ret->rc == PTL_OK) {
275 ptl_md2handle(&ret->handle_out, md);
277 state_unlock (nal, &flags);
282 lib_md_free (nal, md);
284 state_unlock (nal, &flags);
288 int do_PtlMDBind(nal_cb_t * nal, void *private, void *v_args, void *v_ret)
292 * ptl_handle_ni_t ni_in
296 * ptl_handle_md_t * handle_out
299 PtlMDBind_in *args = v_args;
300 PtlMDBind_out *ret = v_ret;
304 if ((args->md_in.options & (PTL_MD_KIOV | PTL_MD_IOVEC)) != 0 &&
305 args->md_in.length > PTL_MD_MAX_IOV) /* too many fragments */
306 return (ret->rc = PTL_IOV_INVALID);
308 md = lib_md_alloc(nal, &args->md_in);
310 return (ret->rc = PTL_NO_SPACE);
312 state_lock(nal, &flags);
314 ret->rc = lib_md_build(nal, md, private, &args->md_in,
315 &args->eq_in, args->unlink_in);
317 if (ret->rc == PTL_OK) {
318 ptl_md2handle(&ret->handle_out, md);
320 state_unlock(nal, &flags);
324 lib_md_free (nal, md);
326 state_unlock(nal, &flags);
330 int do_PtlMDUnlink(nal_cb_t * nal, void *private, void *v_args, void *v_ret)
332 PtlMDUnlink_in *args = v_args;
333 PtlMDUnlink_out *ret = v_ret;
338 state_lock(nal, &flags);
340 md = ptl_handle2md(&args->md_in, nal);
342 state_unlock(nal, &flags);
343 return (ret->rc = PTL_MD_INVALID);
346 /* If the MD is busy, lib_md_unlink just marks it for deletion, and
347 * when the NAL is done, the completion event flags that the MD was
348 * unlinked. Otherwise, we enqueue an event now... */
350 if (md->eq != NULL &&
352 memset(&ev, 0, sizeof(ev));
354 ev.type = PTL_EVENT_UNLINK;
355 ev.ni_fail_type = PTL_OK;
357 lib_md_deconstruct(nal, md, &ev.mem_desc);
359 lib_enq_event_locked(nal, private, md->eq, &ev);
362 lib_md_deconstruct(nal, md, &ret->status_out);
363 lib_md_unlink(nal, md);
366 state_unlock(nal, &flags);
371 int do_PtlMDUpdate_internal(nal_cb_t * nal, void *private, void *v_args,
376 * ptl_handle_md_t md_in
377 * ptl_md_t * old_inout
378 * ptl_md_t * new_inout
379 * ptl_handle_eq_t testq_in
380 * ptl_seq_t sequence_in
383 * ptl_md_t * old_inout
384 * ptl_md_t * new_inout
386 PtlMDUpdate_internal_in *args = v_args;
387 PtlMDUpdate_internal_out *ret = v_ret;
389 lib_eq_t *test_eq = NULL;
390 ptl_md_t *new = &args->new_inout;
393 state_lock(nal, &flags);
395 md = ptl_handle2md(&args->md_in, nal);
397 ret->rc = PTL_MD_INVALID;
401 if (args->old_inout_valid)
402 lib_md_deconstruct(nal, md, &ret->old_inout);
404 if (!args->new_inout_valid) {
409 /* XXX fttb, the new MD must be the same "shape" wrt fragmentation,
410 * since we simply overwrite the old lib-md */
411 if ((((new->options ^ md->options) &
412 (PTL_MD_IOVEC | PTL_MD_KIOV)) != 0) ||
413 ((new->options & (PTL_MD_IOVEC | PTL_MD_KIOV)) != 0 &&
414 new->length != md->md_niov)) {
415 ret->rc = PTL_IOV_INVALID;
419 if (!PtlHandleIsEqual (args->testq_in, PTL_EQ_NONE)) {
420 test_eq = ptl_handle2eq(&args->testq_in, nal);
421 if (test_eq == NULL) {
422 ret->rc = PTL_EQ_INVALID;
427 if (md->pending != 0) {
428 ret->rc = PTL_MD_NO_UPDATE;
432 if (test_eq == NULL ||
433 test_eq->sequence == args->sequence_in) {
434 lib_me_t *me = md->me;
435 int unlink = (md->md_flags & PTL_MD_FLAG_AUTO_UNLINK) ?
436 PTL_UNLINK : PTL_RETAIN;
438 // #warning this does not track eq refcounts properly
439 ret->rc = lib_md_build(nal, md, private,
440 new, &new->eventq, unlink);
444 ret->rc = PTL_MD_NO_UPDATE;
448 state_unlock(nal, &flags);