2 * Copyright (c) 1997, 2002 Hellmuth Michaelis. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 /*---------------------------------------------------------------------------
28 * i4b_sframe.c - s frame handling routines
29 * ----------------------------------------
30 * last edit-date: [Sat Mar 9 17:52:06 2002]
32 *---------------------------------------------------------------------------*/
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include <sys/param.h>
38 #include <sys/systm.h>
40 #include <sys/socket.h>
43 #include <i4b/include/i4b_debug.h>
45 #include <i4b/include/i4b_l1l2.h>
46 #include <i4b/include/i4b_mbuf.h>
48 #include <i4b/layer2/i4b_l2.h>
49 #include <i4b/layer2/i4b_l2fsm.h>
51 /*---------------------------------------------------------------------------*
53 *---------------------------------------------------------------------------*/
55 i4b_rxd_s_frame(int unit, struct mbuf *m)
57 l2_softc_t *l2sc = &l2_softc[unit];
58 u_char *ptr = m->m_data;
60 if(!((l2sc->tei_valid == TEI_VALID) &&
61 (l2sc->tei == GETTEI(*(ptr+OFF_TEI)))))
67 l2sc->rxd_CR = GETCR(*(ptr + OFF_SAPI));
68 l2sc->rxd_PF = GETSPF(*(ptr + OFF_SNR));
69 l2sc->rxd_NR = GETSNR(*(ptr + OFF_SNR));
71 i4b_rxd_ack(l2sc, l2sc->rxd_NR);
73 switch(*(ptr + OFF_SRCR))
76 l2sc->stat.rx_rr++; /* update statistics */
77 NDBGL2(L2_S_MSG, "rx'd RR, N(R) = %d", l2sc->rxd_NR);
78 i4b_next_l2state(l2sc, EV_RXRR);
82 l2sc->stat.rx_rnr++; /* update statistics */
83 NDBGL2(L2_S_MSG, "rx'd RNR, N(R) = %d", l2sc->rxd_NR);
84 i4b_next_l2state(l2sc, EV_RXRNR);
88 l2sc->stat.rx_rej++; /* update statistics */
89 NDBGL2(L2_S_MSG, "rx'd REJ, N(R) = %d", l2sc->rxd_NR);
90 i4b_next_l2state(l2sc, EV_RXREJ);
94 l2sc->stat.err_rx_bads++; /* update statistics */
95 NDBGL2(L2_S_ERR, "ERROR, unknown code, frame = ");
96 i4b_print_frame(m->m_len, m->m_data);
102 /*---------------------------------------------------------------------------*
103 * transmit RR command
104 *---------------------------------------------------------------------------*/
106 i4b_tx_rr_command(l2_softc_t *l2sc, pbit_t pbit)
110 NDBGL2(L2_S_MSG, "tx RR, unit = %d", l2sc->unit);
112 m = i4b_build_s_frame(l2sc, CR_CMD_TO_NT, pbit, RR);
114 PH_Data_Req(l2sc->unit, m, MBUF_FREE);
116 l2sc->stat.tx_rr++; /* update statistics */
119 /*---------------------------------------------------------------------------*
120 * transmit RR response
121 *---------------------------------------------------------------------------*/
123 i4b_tx_rr_response(l2_softc_t *l2sc, fbit_t fbit)
127 NDBGL2(L2_S_MSG, "tx RR, unit = %d", l2sc->unit);
129 m = i4b_build_s_frame(l2sc, CR_RSP_TO_NT, fbit, RR);
131 PH_Data_Req(l2sc->unit, m, MBUF_FREE);
133 l2sc->stat.tx_rr++; /* update statistics */
136 /*---------------------------------------------------------------------------*
137 * transmit RNR command
138 *---------------------------------------------------------------------------*/
140 i4b_tx_rnr_command(l2_softc_t *l2sc, pbit_t pbit)
144 NDBGL2(L2_S_MSG, "tx RNR, unit = %d", l2sc->unit);
146 m = i4b_build_s_frame(l2sc, CR_CMD_TO_NT, pbit, RNR);
148 PH_Data_Req(l2sc->unit, m, MBUF_FREE);
150 l2sc->stat.tx_rnr++; /* update statistics */
153 /*---------------------------------------------------------------------------*
154 * transmit RNR response
155 *---------------------------------------------------------------------------*/
157 i4b_tx_rnr_response(l2_softc_t *l2sc, fbit_t fbit)
161 NDBGL2(L2_S_MSG, "tx RNR, unit = %d", l2sc->unit);
163 m = i4b_build_s_frame(l2sc, CR_RSP_TO_NT, fbit, RNR);
165 PH_Data_Req(l2sc->unit, m, MBUF_FREE);
167 l2sc->stat.tx_rnr++; /* update statistics */
170 /*---------------------------------------------------------------------------*
171 * transmit REJ response
172 *---------------------------------------------------------------------------*/
174 i4b_tx_rej_response(l2_softc_t *l2sc, fbit_t fbit)
178 NDBGL2(L2_S_MSG, "tx REJ, unit = %d", l2sc->unit);
180 m = i4b_build_s_frame(l2sc, CR_RSP_TO_NT, fbit, REJ);
182 PH_Data_Req(l2sc->unit, m, MBUF_FREE);
184 l2sc->stat.tx_rej++; /* update statistics */
187 /*---------------------------------------------------------------------------*
188 * build S-frame for sending
189 *---------------------------------------------------------------------------*/
191 i4b_build_s_frame(l2_softc_t *l2sc, crbit_to_nt_t crbit, pbit_t pbit, u_char type)
195 if((m = i4b_Dgetmbuf(S_FRAME_LEN)) == NULL)
198 PUTSAPI(SAPI_CCP, crbit, m->m_data[OFF_SAPI]);
200 PUTTEI(l2sc->tei, m->m_data[OFF_TEI]);
202 m->m_data[OFF_SRCR] = type;
204 m->m_data[OFF_SNR] = (l2sc->vr << 1) | (pbit & 0x01);