mISDN: L2 timeouts need to be queued as L2 event
To be full preemptiv safe, we cannot handle a L2 timeout in the timer context itself, we should do all actions via the D-channel thread. Signed-off-by: Karsten Keil <kkeil@linux-pingi.de> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karsten Keil
David S. Miller
parent
7ed80fe45d
commit
8423e6b212
@ -58,6 +58,8 @@ enum {
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EV_L1_DEACTIVATE,
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EV_L2_T200,
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EV_L2_T203,
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EV_L2_T200I,
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EV_L2_T203I,
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EV_L2_SET_OWN_BUSY,
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EV_L2_CLEAR_OWN_BUSY,
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EV_L2_FRAME_ERROR,
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@ -86,6 +88,8 @@ static char *strL2Event[] =
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"EV_L1_DEACTIVATE",
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"EV_L2_T200",
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"EV_L2_T203",
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"EV_L2_T200I",
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"EV_L2_T203I",
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"EV_L2_SET_OWN_BUSY",
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"EV_L2_CLEAR_OWN_BUSY",
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"EV_L2_FRAME_ERROR",
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@ -276,6 +280,31 @@ ph_data_confirm(struct layer2 *l2, struct mISDNhead *hh, struct sk_buff *skb) {
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return ret;
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}
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static void
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l2_timeout(struct FsmInst *fi, int event, void *arg)
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{
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struct layer2 *l2 = fi->userdata;
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struct sk_buff *skb;
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struct mISDNhead *hh;
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skb = mI_alloc_skb(0, GFP_ATOMIC);
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if (!skb) {
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printk(KERN_WARNING "L2(%d,%d) nr:%x timer %s lost - no skb\n",
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l2->sapi, l2->tei, l2->ch.nr, event == EV_L2_T200 ?
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"T200" : "T203");
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return;
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}
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hh = mISDN_HEAD_P(skb);
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hh->prim = event == EV_L2_T200 ? DL_TIMER200_IND : DL_TIMER203_IND;
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hh->id = l2->ch.nr;
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if (*debug & DEBUG_TIMER)
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printk(KERN_DEBUG "L2(%d,%d) nr:%x timer %s expired\n",
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l2->sapi, l2->tei, l2->ch.nr, event == EV_L2_T200 ?
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"T200" : "T203");
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if (l2->ch.st)
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l2->ch.st->own.recv(&l2->ch.st->own, skb);
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}
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static int
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l2mgr(struct layer2 *l2, u_int prim, void *arg) {
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long c = (long)arg;
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@ -1814,11 +1843,16 @@ static struct FsmNode L2FnList[] =
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{ST_L2_8, EV_L2_SUPER, l2_st8_got_super},
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{ST_L2_7, EV_L2_I, l2_got_iframe},
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{ST_L2_8, EV_L2_I, l2_got_iframe},
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{ST_L2_5, EV_L2_T200, l2_st5_tout_200},
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{ST_L2_6, EV_L2_T200, l2_st6_tout_200},
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{ST_L2_7, EV_L2_T200, l2_st7_tout_200},
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{ST_L2_8, EV_L2_T200, l2_st8_tout_200},
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{ST_L2_7, EV_L2_T203, l2_st7_tout_203},
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{ST_L2_5, EV_L2_T200, l2_timeout},
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{ST_L2_6, EV_L2_T200, l2_timeout},
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{ST_L2_7, EV_L2_T200, l2_timeout},
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{ST_L2_8, EV_L2_T200, l2_timeout},
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{ST_L2_7, EV_L2_T203, l2_timeout},
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{ST_L2_5, EV_L2_T200I, l2_st5_tout_200},
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{ST_L2_6, EV_L2_T200I, l2_st6_tout_200},
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{ST_L2_7, EV_L2_T200I, l2_st7_tout_200},
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{ST_L2_8, EV_L2_T200I, l2_st8_tout_200},
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{ST_L2_7, EV_L2_T203I, l2_st7_tout_203},
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{ST_L2_7, EV_L2_ACK_PULL, l2_pull_iqueue},
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{ST_L2_7, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
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{ST_L2_8, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
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@ -1932,6 +1966,14 @@ l2_send(struct mISDNchannel *ch, struct sk_buff *skb)
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if (*debug & DEBUG_L2_RECV)
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printk(KERN_DEBUG "%s: prim(%x) id(%x) sapi(%d) tei(%d)\n",
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__func__, hh->prim, hh->id, l2->sapi, l2->tei);
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if (hh->prim == DL_INTERN_MSG) {
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struct mISDNhead *chh = hh + 1; /* saved copy */
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*hh = *chh;
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if (*debug & DEBUG_L2_RECV)
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printk(KERN_DEBUG "%s: prim(%x) id(%x) internal msg\n",
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__func__, hh->prim, hh->id);
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}
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switch (hh->prim) {
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case PH_DATA_IND:
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ret = ph_data_indication(l2, hh, skb);
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@ -1987,6 +2029,12 @@ l2_send(struct mISDNchannel *ch, struct sk_buff *skb)
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ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_RELEASE_REQ,
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skb);
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break;
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case DL_TIMER200_IND:
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mISDN_FsmEvent(&l2->l2m, EV_L2_T200I, NULL);
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break;
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case DL_TIMER203_IND:
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mISDN_FsmEvent(&l2->l2m, EV_L2_T203I, NULL);
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break;
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default:
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if (*debug & DEBUG_L2)
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l2m_debug(&l2->l2m, "l2 unknown pr %04x",
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@ -1294,7 +1294,7 @@ static int
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mgr_bcast(struct mISDNchannel *ch, struct sk_buff *skb)
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{
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struct manager *mgr = container_of(ch, struct manager, bcast);
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struct mISDNhead *hh = mISDN_HEAD_P(skb);
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struct mISDNhead *hhc, *hh = mISDN_HEAD_P(skb);
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struct sk_buff *cskb = NULL;
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struct layer2 *l2;
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u_long flags;
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@ -1309,10 +1309,17 @@ mgr_bcast(struct mISDNchannel *ch, struct sk_buff *skb)
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skb = NULL;
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} else {
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if (!cskb)
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cskb = skb_copy(skb, GFP_KERNEL);
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cskb = skb_copy(skb, GFP_ATOMIC);
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}
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if (cskb) {
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ret = l2->ch.send(&l2->ch, cskb);
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hhc = mISDN_HEAD_P(cskb);
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/* save original header behind normal header */
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hhc++;
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*hhc = *hh;
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hhc--;
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hhc->prim = DL_INTERN_MSG;
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hhc->id = l2->ch.nr;
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ret = ch->st->own.recv(&ch->st->own, cskb);
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if (ret) {
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if (*debug & DEBUG_SEND_ERR)
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printk(KERN_DEBUG
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@ -37,7 +37,7 @@
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*/
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#define MISDN_MAJOR_VERSION 1
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#define MISDN_MINOR_VERSION 1
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#define MISDN_RELEASE 21
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#define MISDN_RELEASE 26
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/* primitives for information exchange
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* generell format
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@ -115,6 +115,11 @@
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#define MDL_ERROR_IND 0x1F04
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#define MDL_ERROR_RSP 0x5F04
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/* intern layer 2 */
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#define DL_TIMER200_IND 0x7004
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#define DL_TIMER203_IND 0x7304
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#define DL_INTERN_MSG 0x7804
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/* DL_INFORMATION_IND types */
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#define DL_INFO_L2_CONNECT 0x0001
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#define DL_INFO_L2_REMOVED 0x0002
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