1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2002-2003 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 #include <sys/errno.h>
30 #include <ipp/ipgpc/classifier.h>
31 
32 /* Implementation file for behavior aggregate (BA) lookup table */
33 
34 /*
35  * ba_insert(bataid, filter_id, val, mask)
36  *
37  * inserts filter_id into element list of bataid->table->masked_values
38  * at position val& mask, mask is inserted into the mask list.
39  * filter_id shouldn't already exist in element list at
40  * bataid->table->masked_values[val], an error message is printed if this
41  * occurs.
42  * return DONTCARE_VALUE if mask == 0, NORMAL_VALUE otherwise
43  */
44 int
ba_insert(ba_table_id_t * bataid,int filter_id,uint8_t val,uint8_t mask)45 ba_insert(ba_table_id_t *bataid, int filter_id, uint8_t val, uint8_t mask)
46 {
47 	uint8_t mskd_val = val & mask;
48 	ba_table_t *table = &bataid->table;
49 
50 	/* dontcares are not inserted */
51 	if (mask == 0) {
52 		++bataid->stats.num_dontcare;
53 		return (DONTCARE_VALUE);
54 	}
55 
56 	if (bataid->info.dontcareonly == B_TRUE) {
57 		bataid->info.dontcareonly = B_FALSE;
58 	}
59 
60 	if (ipgpc_list_insert(&table->masked_values[mskd_val].filter_list,
61 	    filter_id) == EEXIST) {
62 		ipgpc0dbg(("ba_insert():filter_id %d EEXIST in ba_table",
63 		    filter_id));
64 	} else {
65 		/* insert mask */
66 		(void) ipgpc_list_insert(&table->masks, mask);
67 		/* update stats */
68 		++table->masked_values[mskd_val].info;
69 		++bataid->stats.num_inserted;
70 	}
71 	return (NORMAL_VALUE);
72 }
73 
74 /*
75  * ba_retrieve(bataid, value, fid_table)
76  *
77  * searches for all filters matching value in bataid->table
78  * search is performed by appling each mask in bataid->table->masks list
79  * to value and then looking value up in bataid->table->masked_values.
80  * Each filter id that is matched, is inserted into fid_table
81  * returns number of matched filters or (-1) if memory error
82  */
83 int
ba_retrieve(ba_table_id_t * bataid,uint8_t value,ht_match_t * fid_table)84 ba_retrieve(ba_table_id_t *bataid, uint8_t value, ht_match_t *fid_table)
85 {
86 	element_node_t *p;
87 	element_node_t *filter_list;
88 	int num_found = 0;
89 	int ret;
90 	int masked_value = 0;
91 	ba_table_t *table = &bataid->table;
92 
93 	/* special case, if value == 0, no need to apply masks */
94 	if (value == 0) {
95 		/* masked value will always be 0 for this case */
96 		filter_list =
97 		    table->masked_values[0].filter_list;
98 		if ((num_found = ipgpc_mark_found(bataid->info.mask,
99 		    filter_list, fid_table)) == -1) {
100 			return (-1); /* signifies a memory error */
101 		}
102 		return (num_found);
103 	}
104 
105 	/* apply each mask to the value and do the look up in the ba table */
106 	for (p = table->masks; p != NULL; p = p->next) {
107 		masked_value = (uint8_t)(p->id) & value;
108 		if (bataid->table.masked_values[masked_value].info == 0) {
109 			/* masked_value has 0 filters associated with it */
110 			continue;
111 		}
112 		filter_list =
113 		    table->masked_values[masked_value].filter_list;
114 		if ((ret = ipgpc_mark_found(bataid->info.mask, filter_list,
115 		    fid_table)) == -1) {
116 			return (-1); /* signifies a memory error */
117 		}
118 		num_found += ret; /* increment num_found */
119 	}
120 
121 	return (num_found);
122 }
123 
124 /*
125  * ba_remove(bataid, filter_id, value, mask)
126  *
127  * removes filter_id from bataid->table->masked_values[mask & value]
128  * mask is removed from bataid->table->masks if refcnt == 0 for that list
129  */
130 void
ba_remove(ba_table_id_t * bataid,int filter_id,uint8_t value,uint8_t mask)131 ba_remove(ba_table_id_t *bataid, int filter_id, uint8_t value, uint8_t mask)
132 {
133 	uint8_t masked_value = value & mask;
134 	ba_table_t *table = &bataid->table;
135 
136 	/* dontcares are not inserted */
137 	if (mask == 0) {
138 		--bataid->stats.num_dontcare;
139 		return;
140 	}
141 
142 	if (ipgpc_list_remove(&table->masked_values[masked_value].filter_list,
143 	    filter_id) == B_TRUE) {
144 		/* update stats */
145 		--table->masked_values[masked_value].info;
146 		--bataid->stats.num_inserted;
147 		/*
148 		 * check to see if removing this entry will result in
149 		 * don't cares only inserted in the table
150 		 */
151 		if (bataid->stats.num_inserted <= 0) {
152 			bataid->info.dontcareonly = B_TRUE;
153 		}
154 		/* remove mask if refcnt == 0 */
155 		(void) ipgpc_list_remove(&table->masks, mask);
156 	}
157 }
158