1 /* 2 * llc_s_st.c - Defines SAP component state machine transitions. 3 * 4 * The followed transitions are SAP component state machine transitions 5 * which are described in 802.2 LLC protocol standard document. 6 * 7 * Copyright (c) 1997 by Procom Technology, Inc. 8 * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> 9 * 10 * This program can be redistributed or modified under the terms of the 11 * GNU General Public License as published by the Free Software Foundation. 12 * This program is distributed without any warranty or implied warranty 13 * of merchantability or fitness for a particular purpose. 14 * 15 * See the GNU General Public License for more details. 16 */ 17 #include <linux/types.h> 18 #include <net/llc_if.h> 19 #include <net/llc_s_ev.h> 20 #include <net/llc_s_ac.h> 21 #include <net/llc_s_st.h> 22 23 /* dummy last-transition indicator; common to all state transition groups 24 * last entry for this state 25 * all members are zeros, .bss zeroes it 26 */ 27 static const struct llc_sap_state_trans llc_sap_state_trans_end; 28 29 /* state LLC_SAP_STATE_INACTIVE transition for 30 * LLC_SAP_EV_ACTIVATION_REQ event 31 */ 32 static const llc_sap_action_t llc_sap_inactive_state_actions_1[] = { 33 [0] = llc_sap_action_report_status, 34 [1] = NULL, 35 }; 36 37 static const struct llc_sap_state_trans llc_sap_inactive_state_trans_1 = { 38 .ev = llc_sap_ev_activation_req, 39 .next_state = LLC_SAP_STATE_ACTIVE, 40 .ev_actions = llc_sap_inactive_state_actions_1, 41 }; 42 43 /* array of pointers; one to each transition */ 44 static const struct llc_sap_state_trans *llc_sap_inactive_state_transitions[] = { 45 [0] = &llc_sap_inactive_state_trans_1, 46 [1] = &llc_sap_state_trans_end, 47 }; 48 49 /* state LLC_SAP_STATE_ACTIVE transition for LLC_SAP_EV_RX_UI event */ 50 static const llc_sap_action_t llc_sap_active_state_actions_1[] = { 51 [0] = llc_sap_action_unitdata_ind, 52 [1] = NULL, 53 }; 54 55 static const struct llc_sap_state_trans llc_sap_active_state_trans_1 = { 56 .ev = llc_sap_ev_rx_ui, 57 .next_state = LLC_SAP_STATE_ACTIVE, 58 .ev_actions = llc_sap_active_state_actions_1, 59 }; 60 61 /* state LLC_SAP_STATE_ACTIVE transition for LLC_SAP_EV_UNITDATA_REQ event */ 62 static const llc_sap_action_t llc_sap_active_state_actions_2[] = { 63 [0] = llc_sap_action_send_ui, 64 [1] = NULL, 65 }; 66 67 static const struct llc_sap_state_trans llc_sap_active_state_trans_2 = { 68 .ev = llc_sap_ev_unitdata_req, 69 .next_state = LLC_SAP_STATE_ACTIVE, 70 .ev_actions = llc_sap_active_state_actions_2, 71 }; 72 73 /* state LLC_SAP_STATE_ACTIVE transition for LLC_SAP_EV_XID_REQ event */ 74 static const llc_sap_action_t llc_sap_active_state_actions_3[] = { 75 [0] = llc_sap_action_send_xid_c, 76 [1] = NULL, 77 }; 78 79 static const struct llc_sap_state_trans llc_sap_active_state_trans_3 = { 80 .ev = llc_sap_ev_xid_req, 81 .next_state = LLC_SAP_STATE_ACTIVE, 82 .ev_actions = llc_sap_active_state_actions_3, 83 }; 84 85 /* state LLC_SAP_STATE_ACTIVE transition for LLC_SAP_EV_RX_XID_C event */ 86 static const llc_sap_action_t llc_sap_active_state_actions_4[] = { 87 [0] = llc_sap_action_send_xid_r, 88 [1] = NULL, 89 }; 90 91 static const struct llc_sap_state_trans llc_sap_active_state_trans_4 = { 92 .ev = llc_sap_ev_rx_xid_c, 93 .next_state = LLC_SAP_STATE_ACTIVE, 94 .ev_actions = llc_sap_active_state_actions_4, 95 }; 96 97 /* state LLC_SAP_STATE_ACTIVE transition for LLC_SAP_EV_RX_XID_R event */ 98 static const llc_sap_action_t llc_sap_active_state_actions_5[] = { 99 [0] = llc_sap_action_xid_ind, 100 [1] = NULL, 101 }; 102 103 static const struct llc_sap_state_trans llc_sap_active_state_trans_5 = { 104 .ev = llc_sap_ev_rx_xid_r, 105 .next_state = LLC_SAP_STATE_ACTIVE, 106 .ev_actions = llc_sap_active_state_actions_5, 107 }; 108 109 /* state LLC_SAP_STATE_ACTIVE transition for LLC_SAP_EV_TEST_REQ event */ 110 static const llc_sap_action_t llc_sap_active_state_actions_6[] = { 111 [0] = llc_sap_action_send_test_c, 112 [1] = NULL, 113 }; 114 115 static const struct llc_sap_state_trans llc_sap_active_state_trans_6 = { 116 .ev = llc_sap_ev_test_req, 117 .next_state = LLC_SAP_STATE_ACTIVE, 118 .ev_actions = llc_sap_active_state_actions_6, 119 }; 120 121 /* state LLC_SAP_STATE_ACTIVE transition for LLC_SAP_EV_RX_TEST_C event */ 122 static const llc_sap_action_t llc_sap_active_state_actions_7[] = { 123 [0] = llc_sap_action_send_test_r, 124 [1] = NULL, 125 }; 126 127 static const struct llc_sap_state_trans llc_sap_active_state_trans_7 = { 128 .ev = llc_sap_ev_rx_test_c, 129 .next_state = LLC_SAP_STATE_ACTIVE, 130 .ev_actions = llc_sap_active_state_actions_7 131 }; 132 133 /* state LLC_SAP_STATE_ACTIVE transition for LLC_SAP_EV_RX_TEST_R event */ 134 static const llc_sap_action_t llc_sap_active_state_actions_8[] = { 135 [0] = llc_sap_action_test_ind, 136 [1] = NULL, 137 }; 138 139 static const struct llc_sap_state_trans llc_sap_active_state_trans_8 = { 140 .ev = llc_sap_ev_rx_test_r, 141 .next_state = LLC_SAP_STATE_ACTIVE, 142 .ev_actions = llc_sap_active_state_actions_8, 143 }; 144 145 /* state LLC_SAP_STATE_ACTIVE transition for 146 * LLC_SAP_EV_DEACTIVATION_REQ event 147 */ 148 static const llc_sap_action_t llc_sap_active_state_actions_9[] = { 149 [0] = llc_sap_action_report_status, 150 [1] = NULL, 151 }; 152 153 static const struct llc_sap_state_trans llc_sap_active_state_trans_9 = { 154 .ev = llc_sap_ev_deactivation_req, 155 .next_state = LLC_SAP_STATE_INACTIVE, 156 .ev_actions = llc_sap_active_state_actions_9 157 }; 158 159 /* array of pointers; one to each transition */ 160 static const struct llc_sap_state_trans *llc_sap_active_state_transitions[] = { 161 [0] = &llc_sap_active_state_trans_2, 162 [1] = &llc_sap_active_state_trans_1, 163 [2] = &llc_sap_active_state_trans_3, 164 [3] = &llc_sap_active_state_trans_4, 165 [4] = &llc_sap_active_state_trans_5, 166 [5] = &llc_sap_active_state_trans_6, 167 [6] = &llc_sap_active_state_trans_7, 168 [7] = &llc_sap_active_state_trans_8, 169 [8] = &llc_sap_active_state_trans_9, 170 [9] = &llc_sap_state_trans_end, 171 }; 172 173 /* SAP state transition table */ 174 struct llc_sap_state llc_sap_state_table[LLC_NR_SAP_STATES] = { 175 [LLC_SAP_STATE_INACTIVE - 1] = { 176 .curr_state = LLC_SAP_STATE_INACTIVE, 177 .transitions = llc_sap_inactive_state_transitions, 178 }, 179 [LLC_SAP_STATE_ACTIVE - 1] = { 180 .curr_state = LLC_SAP_STATE_ACTIVE, 181 .transitions = llc_sap_active_state_transitions, 182 }, 183 }; 184