* OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
* OR MODIFICATIONS.
*
- * $Id: ppp_comp.c,v 1.3 1996/05/28 00:55:44 paulus Exp $
+ * $Id: ppp_comp.c,v 1.4 1996/06/26 00:54:20 paulus Exp $
*/
/*
- * This file is used under SVR4, Solaris 2, SunOS 4, and OSF/1.
+ * This file is used under SVR4, Solaris 2, SunOS 4, and Digital UNIX.
*/
#include <sys/types.h>
#include <net/pppio.h>
#include "ppp_mod.h"
+#ifdef __osf__
+#include <sys/mbuf.h>
+#include <sys/protosw.h>
+#endif
+
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
/* Is this LCP packet one we have to transmit using LCP defaults? */
#define LCP_USE_DFLT(mp) (1 <= (code = MSG_BYTE((mp), 4)) && code <= 7)
+#define PPP_COMP_ID 0xbadf
static struct module_info minfo = {
- 0xbadf, "ppp_comp", 0, INFPSZ, 16384, 4096,
+ PPP_COMP_ID, "ppp_comp", 0, INFPSZ, 16384, 4096,
};
static struct qinit r_init = {
int ppp_comp_count; /* number of module instances in use */
+#ifdef __osf__
+
+static void ppp_comp_alloc __P((comp_state_t *));
+typedef struct memreq {
+ unsigned char *comp;
+ void *mem;
+ int len;
+ int cmd;
+ int ret;
+} memreq_t;
+
+#endif
+
typedef struct comp_state {
int flags;
int mru;
struct vjcompress vj_comp;
int vj_last_ierrors;
struct pppstat stats;
+#ifdef __osf__
+ memreq_t memreq;
+ thread_t thread;
+#endif
} comp_state_t;
+
+#ifdef __osf__
+extern task_t first_task;
+#endif
+
/* Bits in flags are as defined in pppio.h. */
#define CCP_ERR (CCP_ERROR | CCP_FATALERROR)
#define LAST_MOD 0x1000000 /* no ppp modules below us */
MOD_OPEN(ppp_comp_open)
{
comp_state_t *cp;
+#ifdef __osf__
+ thread_t thread;
+#endif
if (q->q_ptr == NULL) {
cp = (comp_state_t *) ALLOC_SLEEP(sizeof(comp_state_t));
vj_compress_init(&cp->vj_comp, -1);
++ppp_comp_count;
qprocson(q);
+#ifdef __osf__
+ if (!(thread = kernel_thread_w_arg(first_task, ppp_comp_alloc, (void *)cp)))
+ OPEN_ERROR(ENOSR);
+ cp->thread = thread;
+#endif
}
return 0;
}
(*cp->xcomp->comp_free)(cp->xstate);
if (cp->rstate != NULL)
(*cp->rcomp->decomp_free)(cp->rstate);
+#ifdef __osf__
+ if (!cp->thread)
+ printf("ppp_comp_close: NULL thread!\n");
+ else
+ thread_deallocate(cp->thread);
+#endif
FREE(cp, sizeof(comp_state_t));
q->q_ptr = NULL;
OTHERQ(q)->q_ptr = NULL;
return 0;
}
+#ifdef __osf__
+
+/* thread for calling back to a compressor's memory allocator
+ * Needed for Digital UNIX since it's VM can't handle requests
+ * for large amounts of memory without blocking. The thread
+ * provides a context in which we can call a memory allocator
+ * that may block.
+ */
+static void
+ppp_comp_alloc(comp_state_t *cp)
+{
+ unsigned char *opt_data;
+ int len, cmd;
+ struct compressor *comp;
+ thread_t thread;
+
+#if (MAJOR_VERSION <= 2)
+
+ /* In 2.x and earlier the argument gets passed
+ * in the thread structure itself. Yuck.
+ */
+ thread = current_thread();
+ cp = thread->reply_port;
+ thread->reply_port = PORT_NULL;
+
+#endif
+
+ for (;;) {
+ assert_wait((vm_offset_t)&cp->memreq.comp, TRUE);
+ thread_block();
+ opt_data = cp->memreq.comp;
+ len = cp->memreq.len;
+ cmd = cp->memreq.cmd;
+
+ if (cmd == PPPIO_XCOMP) {
+ comp = cp->xcomp;
+ cp->memreq.mem = (*comp->comp_alloc)(opt_data, len);
+ } else {
+ comp = cp->rcomp;
+ cp->memreq.mem = (*comp->decomp_alloc)(opt_data, len);
+ }
+ if (!cp->memreq.mem)
+ cp->memreq.ret = ENOSR;
+ else
+ bcopy(opt_data, cp->memreq.mem, len);
+
+ /* have to free thunk here, since there's
+ * no guarantee that the user will call the ioctl
+ * again if we've taken a long time to complete
+ */
+ FREE(opt_data, len);
+ cp->memreq.ret = 0;
+ }
+}
+
+#endif /* __osf__ */
+
+/* here's the deal with memory allocation under Digital UNIX.
+ * Some other may also benefit from this...
+ * We can't ask for huge chunks of memory in a context where
+ * the caller can't be put to sleep (like, here.) The alloc
+ * is likely to fail. Instead we do this: the first time we
+ * get called, kick off a thread to do the allocation. Return
+ * immediately to the caller with EAGAIN, as an indication that
+ * they should send down the ioctl again. By the time the
+ * second call comes in it's likely that the memory allocation
+ * thread will have returned with the requested memory. We will
+ * continue to return EAGAIN however until the thread has completed.
+ * When it has, we return zero (and the memory) if the allocator
+ * was successful and ENOSR otherwise.
+ *
+ * Callers of the RCOMP and XCOMP ioctls are encouraged (but not
+ * required) to loop for some number of iterations with a small
+ * delay in the loop body (for instance a 1/10-th second "sleep"
+ * via select.)
+ */
static int
ppp_comp_wput(q, mp)
queue_t *q;
/* here's the handler! */
error = 0;
if (iop->ioc_cmd == PPPIO_XCOMP) {
- if (cp->xstate != NULL)
+
+ /* A previous call may have fetched memory for a compressor
+ * that's now being retired or reset. Free it using it's
+ * mechanism for freeing stuff.
+ */
+ if (cp->xstate != NULL) {
(*cp->xcomp->comp_free)(cp->xstate);
+ cp->xstate = NULL;
+ }
+
+#ifdef __osf__
+ /* Account for an orpahned call to get memory.
+ * Free that memory up and go on.
+ *
+ * The trick is that we need to be able to tell
+ * the difference between an old call that kicked
+ * off a thread where the memory was subsequently
+ * orphaned, and the memory we're really interested
+ * in. The thread helps by stamping the memory it
+ * allocated with the parameters for the compressor
+ * it belongs to. If the parameters match then this
+ * is the memory we want (whether it was an actual
+ * orphan or not we don't care.) If the parameters
+ * don't match then this is an orphan.
+ *
+ * Note that cp->memreq.ret is the synchronization
+ * point: we set it to EAGAIN in this function, then
+ * wait for the thread to set it to something other
+ * than EAGAIN before we fool with the data structure
+ * again. Basically, if ret != EAGAIN then the thread
+ * is working and it owns the memreq struture.
+ */
+ if (cp->memreq.ret == 0 && cp->memreq.mem != NULL &&
+ bcmp(cp->memreq.mem, opt_data, len)) {
+ (*cp->xcomp->comp_free)(cp->memreq.mem);
+ cp->memreq.mem = 0;
+ }
+
+ /* First time through, prime the pump and kick
+ * off the thread. Subsequent times though, the thread
+ * is either busy (ret == EAGAIN) or finsihed (mem != NULL)
+ * || (ret != 0)
+ */
+ if (cp->memreq.ret == 0 && cp->memreq.mem == NULL) {
+ cp->memreq.comp = ALLOC_NOSLEEP(len);
+ if (!cp->memreq.comp) {
+ printf("gack! can't get memory for thunk\n");
+ return ENOSR;
+ }
+ bcopy(opt_data, cp->memreq.comp, len);
+ cp->memreq.len = len;
+ cp->memreq.cmd = PPPIO_XCOMP;
+ cp->xcomp = *comp;
+ cp->memreq.ret = EAGAIN;
+ thread_wakeup((vm_offset_t)&cp->memreq.comp);
+ }
+
+ /* Collect results from the thread, and reset the
+ * mechanism for the next attempt to allocate memory
+ * If the thread isn't finished (ret == EAGAIN) then
+ * don't reset and just return.
+ */
+ if ((error = cp->memreq.ret) != EAGAIN) {
+ cp->xstate = cp->memreq.mem;
+ cp->memreq.mem = 0;
+ cp->memreq.ret = 0;
+ }
+#else
cp->xcomp = *comp;
cp->xstate = (*comp)->comp_alloc(opt_data, len);
if (cp->xstate == NULL)
error = ENOSR;
+#endif
} else {
- if (cp->rstate != NULL)
+ if (cp->rstate != NULL) {
(*cp->rcomp->decomp_free)(cp->rstate);
+ cp->rstate = NULL;
+ }
+#ifdef __osf__
+ if (cp->memreq.ret == 0 && cp->memreq.mem != NULL &&
+ bcmp(cp->memreq.mem, opt_data, len)) {
+ (*cp->rcomp->comp_free)(cp->memreq.mem);
+ cp->memreq.mem = 0;
+ }
+ if (cp->memreq.ret == 0 && cp->memreq.mem == NULL) {
+ cp->memreq.comp = ALLOC_NOSLEEP(len);
+ if (!cp->memreq.comp) {
+ printf("gack! can't get memory for thunk\n");
+ return ENOSR;
+ }
+ bcopy(opt_data, cp->memreq.comp, len);
+ cp->memreq.len = len;
+ cp->memreq.cmd = PPPIO_RCOMP;
+ cp->rcomp = *comp;
+ cp->memreq.ret = EAGAIN;
+ thread_wakeup((vm_offset_t)&cp->memreq.comp);
+ }
+ if ((error = cp->memreq.ret) != EAGAIN) {
+ cp->rstate = cp->memreq.mem;
+ cp->memreq.mem = 0;
+ cp->memreq.ret = 0;
+ }
+#else
cp->rcomp = *comp;
cp->rstate = (*comp)->decomp_alloc(opt_data, len);
if (cp->rstate == NULL)
error = ENOSR;
+#endif
}
break;
}
* First reset compressor if an input error has occurred.
*/
if (cp->stats.ppp_ierrors != cp->vj_last_ierrors) {
+ DPRINT1("ppp%d: resetting VJ\n", cp->unit);
vj_uncompress_err(&cp->vj_comp);
cp->vj_last_ierrors = cp->stats.ppp_ierrors;
}
vjlen = vj_uncompress_tcp(dp, np->b_wptr - dp, len,
&cp->vj_comp, &iphdr, &iphlen);
- if (vjlen < 0)
+ if (vjlen < 0) {
+#if DEBUG > 1
+ int i;
+ DPRINT2("ppp%d: vj_uncomp_tcp failed, pkt len %d [",
+ cp->unit, len);
+ for (i = 0; i < len && i < 8; ++i)
+ DPRINT1(" %x", dp[i]);
+ DPRINT3("] c=%d u=%d e=%d\n",
+ cp->vj_comp.stats.vjs_compressedin,
+ cp->vj_comp.stats.vjs_uncompressedin,
+ cp->vj_comp.stats.vjs_errorin);
+#endif
+ ++cp->vj_last_ierrors; /* so we don't reset next time */
goto bad;
+ }
/* drop ppp and vj headers off */
if (mp != np) {
/*
* "Decompress" a VJ-uncompressed packet.
*/
- if (!vj_uncompress_uncomp(dp, hlen, &cp->vj_comp))
+ cp->vj_last_ierrors = cp->stats.ppp_ierrors;
+ if (!vj_uncompress_uncomp(dp, hlen, &cp->vj_comp)) {
+#if DEBUG > 1
+ DPRINT2("ppp%d: vj_uncomp_uncomp failed, pkt len %d\n",
+ cp->unit, len);
+#endif
+ ++cp->vj_last_ierrors; /* don't need to reset next time */
goto bad;
+ }
mp->b_rptr[3] = PPP_IP; /* fix up the PPP protocol field */
}
}
projects / ppp.git / commitdiff