xref: /linux/arch/mips/include/asm/octeon/cvmx-helper-util.h (revision 4413e16d9d21673bb5048a2e542f1aaa00015c2e)
1 /***********************license start***************
2  * Author: Cavium Networks
3  *
4  * Contact: support@caviumnetworks.com
5  * This file is part of the OCTEON SDK
6  *
7  * Copyright (c) 2003-2008 Cavium Networks
8  *
9  * This file is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License, Version 2, as
11  * published by the Free Software Foundation.
12  *
13  * This file is distributed in the hope that it will be useful, but
14  * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
16  * NONINFRINGEMENT.  See the GNU General Public License for more
17  * details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this file; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22  * or visit http://www.gnu.org/licenses/.
23  *
24  * This file may also be available under a different license from Cavium.
25  * Contact Cavium Networks for more information
26  ***********************license end**************************************/
27 
28 /*
29  *
30  * Small helper utilities.
31  *
32  */
33 
34 #ifndef __CVMX_HELPER_UTIL_H__
35 #define __CVMX_HELPER_UTIL_H__
36 
37 /**
38  * Convert a interface mode into a human readable string
39  *
40  * @mode:   Mode to convert
41  *
42  * Returns String
43  */
44 extern const char
45     *cvmx_helper_interface_mode_to_string(cvmx_helper_interface_mode_t mode);
46 
47 /**
48  * Debug routine to dump the packet structure to the console
49  *
50  * @work:   Work queue entry containing the packet to dump
51  * Returns
52  */
53 extern int cvmx_helper_dump_packet(cvmx_wqe_t *work);
54 
55 /**
56  * Setup Random Early Drop on a specific input queue
57  *
58  * @queue:  Input queue to setup RED on (0-7)
59  * @pass_thresh:
60  *               Packets will begin slowly dropping when there are less than
61  *               this many packet buffers free in FPA 0.
62  * @drop_thresh:
63  *               All incomming packets will be dropped when there are less
64  *               than this many free packet buffers in FPA 0.
65  * Returns Zero on success. Negative on failure
66  */
67 extern int cvmx_helper_setup_red_queue(int queue, int pass_thresh,
68 				       int drop_thresh);
69 
70 /**
71  * Setup Random Early Drop to automatically begin dropping packets.
72  *
73  * @pass_thresh:
74  *               Packets will begin slowly dropping when there are less than
75  *               this many packet buffers free in FPA 0.
76  * @drop_thresh:
77  *               All incomming packets will be dropped when there are less
78  *               than this many free packet buffers in FPA 0.
79  * Returns Zero on success. Negative on failure
80  */
81 extern int cvmx_helper_setup_red(int pass_thresh, int drop_thresh);
82 
83 /**
84  * Get the version of the CVMX libraries.
85  *
86  * Returns Version string. Note this buffer is allocated statically
87  *         and will be shared by all callers.
88  */
89 extern const char *cvmx_helper_get_version(void);
90 
91 /**
92  * Setup the common GMX settings that determine the number of
93  * ports. These setting apply to almost all configurations of all
94  * chips.
95  *
96  * @interface: Interface to configure
97  * @num_ports: Number of ports on the interface
98  *
99  * Returns Zero on success, negative on failure
100  */
101 extern int __cvmx_helper_setup_gmx(int interface, int num_ports);
102 
103 /**
104  * Returns the IPD/PKO port number for a port on the given
105  * interface.
106  *
107  * @interface: Interface to use
108  * @port:      Port on the interface
109  *
110  * Returns IPD/PKO port number
111  */
112 extern int cvmx_helper_get_ipd_port(int interface, int port);
113 
114 /**
115  * Returns the IPD/PKO port number for the first port on the given
116  * interface.
117  *
118  * @interface: Interface to use
119  *
120  * Returns IPD/PKO port number
121  */
122 static inline int cvmx_helper_get_first_ipd_port(int interface)
123 {
124 	return cvmx_helper_get_ipd_port(interface, 0);
125 }
126 
127 /**
128  * Returns the IPD/PKO port number for the last port on the given
129  * interface.
130  *
131  * @interface: Interface to use
132  *
133  * Returns IPD/PKO port number
134  */
135 static inline int cvmx_helper_get_last_ipd_port(int interface)
136 {
137 	extern int cvmx_helper_ports_on_interface(int interface);
138 
139 	return cvmx_helper_get_first_ipd_port(interface) +
140 	       cvmx_helper_ports_on_interface(interface) - 1;
141 }
142 
143 /**
144  * Free the packet buffers contained in a work queue entry.
145  * The work queue entry is not freed.
146  *
147  * @work:   Work queue entry with packet to free
148  */
149 static inline void cvmx_helper_free_packet_data(cvmx_wqe_t *work)
150 {
151 	uint64_t number_buffers;
152 	union cvmx_buf_ptr buffer_ptr;
153 	union cvmx_buf_ptr next_buffer_ptr;
154 	uint64_t start_of_buffer;
155 
156 	number_buffers = work->word2.s.bufs;
157 	if (number_buffers == 0)
158 		return;
159 	buffer_ptr = work->packet_ptr;
160 
161 	/*
162 	 * Since the number of buffers is not zero, we know this is
163 	 * not a dynamic short packet. We need to check if it is a
164 	 * packet received with IPD_CTL_STATUS[NO_WPTR]. If this is
165 	 * true, we need to free all buffers except for the first
166 	 * one. The caller doesn't expect their WQE pointer to be
167 	 * freed
168 	 */
169 	start_of_buffer = ((buffer_ptr.s.addr >> 7) - buffer_ptr.s.back) << 7;
170 	if (cvmx_ptr_to_phys(work) == start_of_buffer) {
171 		next_buffer_ptr =
172 		    *(union cvmx_buf_ptr *) cvmx_phys_to_ptr(buffer_ptr.s.addr - 8);
173 		buffer_ptr = next_buffer_ptr;
174 		number_buffers--;
175 	}
176 
177 	while (number_buffers--) {
178 		/*
179 		 * Remember the back pointer is in cache lines, not
180 		 * 64bit words
181 		 */
182 		start_of_buffer =
183 		    ((buffer_ptr.s.addr >> 7) - buffer_ptr.s.back) << 7;
184 		/*
185 		 * Read pointer to next buffer before we free the
186 		 * current buffer.
187 		 */
188 		next_buffer_ptr =
189 		    *(union cvmx_buf_ptr *) cvmx_phys_to_ptr(buffer_ptr.s.addr - 8);
190 		cvmx_fpa_free(cvmx_phys_to_ptr(start_of_buffer),
191 			      buffer_ptr.s.pool, 0);
192 		buffer_ptr = next_buffer_ptr;
193 	}
194 }
195 
196 /**
197  * Returns the interface number for an IPD/PKO port number.
198  *
199  * @ipd_port: IPD/PKO port number
200  *
201  * Returns Interface number
202  */
203 extern int cvmx_helper_get_interface_num(int ipd_port);
204 
205 /**
206  * Returns the interface index number for an IPD/PKO port
207  * number.
208  *
209  * @ipd_port: IPD/PKO port number
210  *
211  * Returns Interface index number
212  */
213 extern int cvmx_helper_get_interface_index_num(int ipd_port);
214 
215 #endif /* __CVMX_HELPER_H__ */
216