cvmx-helper-util.h revision 210286 
1/***********************license start***************
2 *  Copyright (c) 2003-2008 Cavium Networks (support@cavium.com). All rights
3 *  reserved.
4 *
5 *
6 *  Redistribution and use in source and binary forms, with or without
7 *  modification, are permitted provided that the following conditions are
8 *  met:
9 *
10 *      * Redistributions of source code must retain the above copyright
11 *        notice, this list of conditions and the following disclaimer.
12 *
13 *      * Redistributions in binary form must reproduce the above
14 *        copyright notice, this list of conditions and the following
15 *        disclaimer in the documentation and/or other materials provided
16 *        with the distribution.
17 *
18 *      * Neither the name of Cavium Networks nor the names of
19 *        its contributors may be used to endorse or promote products
20 *        derived from this software without specific prior written
21 *        permission.
22 *
23 *  TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
24 *  AND WITH ALL FAULTS AND CAVIUM NETWORKS MAKES NO PROMISES, REPRESENTATIONS
25 *  OR WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH
26 *  RESPECT TO THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY
27 *  REPRESENTATION OR DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT
28 *  DEFECTS, AND CAVIUM SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES
29 *  OF TITLE, MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR
30 *  PURPOSE, LACK OF VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET
31 *  POSSESSION OR CORRESPONDENCE TO DESCRIPTION.  THE ENTIRE RISK ARISING OUT
32 *  OF USE OR PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
33 *
34 *
35 *  For any questions regarding licensing please contact marketing@caviumnetworks.com
36 *
37 ***********************license end**************************************/
38
39
40
41
42
43
44/**
45 * @file
46 *
47 * Small helper utilities.
48 *
49 * <hr>$Revision: 41586 $<hr>
50 */
51
52#ifndef __CVMX_HELPER_UTIL_H__
53#define __CVMX_HELPER_UTIL_H__
54
55
56#ifdef CVMX_ENABLE_HELPER_FUNCTIONS
57
58/**
59 * Convert a interface mode into a human readable string
60 *
61 * @param mode   Mode to convert
62 *
63 * @return String
64 */
65extern const char *cvmx_helper_interface_mode_to_string(cvmx_helper_interface_mode_t mode);
66
67/**
68 * Debug routine to dump the packet structure to the console
69 *
70 * @param work   Work queue entry containing the packet to dump
71 * @return
72 */
73extern int cvmx_helper_dump_packet(cvmx_wqe_t *work);
74
75/**
76 * Setup Random Early Drop on a specific input queue
77 *
78 * @param queue  Input queue to setup RED on (0-7)
79 * @param pass_thresh
80 *               Packets will begin slowly dropping when there are less than
81 *               this many packet buffers free in FPA 0.
82 * @param drop_thresh
83 *               All incomming packets will be dropped when there are less
84 *               than this many free packet buffers in FPA 0.
85 * @return Zero on success. Negative on failure
86 */
87extern int cvmx_helper_setup_red_queue(int queue, int pass_thresh, int drop_thresh);
88
89/**
90 * Setup Random Early Drop to automatically begin dropping packets.
91 *
92 * @param pass_thresh
93 *               Packets will begin slowly dropping when there are less than
94 *               this many packet buffers free in FPA 0.
95 * @param drop_thresh
96 *               All incomming packets will be dropped when there are less
97 *               than this many free packet buffers in FPA 0.
98 * @return Zero on success. Negative on failure
99 */
100extern int cvmx_helper_setup_red(int pass_thresh, int drop_thresh);
101
102
103/**
104 * Get the version of the CVMX libraries.
105 *
106 * @return Version string. Note this buffer is allocated statically
107 *         and will be shared by all callers.
108 */
109extern const char *cvmx_helper_get_version(void);
110
111
112/**
113 * @INTERNAL
114 * Setup the common GMX settings that determine the number of
115 * ports. These setting apply to almost all configurations of all
116 * chips.
117 *
118 * @param interface Interface to configure
119 * @param num_ports Number of ports on the interface
120 *
121 * @return Zero on success, negative on failure
122 */
123extern int __cvmx_helper_setup_gmx(int interface, int num_ports);
124
125/**
126 * Returns the IPD/PKO port number for a port on the given
127 * interface.
128 *
129 * @param interface Interface to use
130 * @param port      Port on the interface
131 *
132 * @return IPD/PKO port number
133 */
134extern int cvmx_helper_get_ipd_port(int interface, int port);
135
136
137/**
138 * Returns the IPD/PKO port number for the first port on the given
139 * interface.
140 *
141 * @param interface Interface to use
142 *
143 * @return IPD/PKO port number
144 */
145static inline int cvmx_helper_get_first_ipd_port(int interface)
146{
147    return (cvmx_helper_get_ipd_port (interface, 0));
148}
149
150/**
151 * Returns the IPD/PKO port number for the last port on the given
152 * interface.
153 *
154 * @param interface Interface to use
155 *
156 * @return IPD/PKO port number
157 */
158static inline int cvmx_helper_get_last_ipd_port (int interface)
159{
160    extern int cvmx_helper_ports_on_interface (int interface);
161
162    return (cvmx_helper_get_first_ipd_port (interface) +
163  	    cvmx_helper_ports_on_interface (interface) - 1);
164}
165
166
167/**
168 * Free the packet buffers contained in a work queue entry.
169 * The work queue entry is not freed.
170 *
171 * @param work   Work queue entry with packet to free
172 */
173static inline void cvmx_helper_free_packet_data(cvmx_wqe_t *work)
174{
175    uint64_t        number_buffers;
176    cvmx_buf_ptr_t  buffer_ptr;
177    cvmx_buf_ptr_t  next_buffer_ptr;
178    uint64_t        start_of_buffer;
179
180    number_buffers = work->word2.s.bufs;
181    if (number_buffers == 0)
182        return;
183    buffer_ptr = work->packet_ptr;
184
185    /* Since the number of buffers is not zero, we know this is not a dynamic
186        short packet. We need to check if it is a packet received with
187        IPD_CTL_STATUS[NO_WPTR]. If this is true, we need to free all buffers
188        except for the first one. The caller doesn't expect their WQE pointer
189        to be freed */
190    start_of_buffer = ((buffer_ptr.s.addr >> 7) - buffer_ptr.s.back) << 7;
191    if (cvmx_ptr_to_phys(work) == start_of_buffer)
192    {
193        next_buffer_ptr = *(cvmx_buf_ptr_t*)cvmx_phys_to_ptr(buffer_ptr.s.addr - 8);
194        buffer_ptr = next_buffer_ptr;
195        number_buffers--;
196    }
197
198    while (number_buffers--)
199    {
200        /* Remember the back pointer is in cache lines, not 64bit words */
201        start_of_buffer = ((buffer_ptr.s.addr >> 7) - buffer_ptr.s.back) << 7;
202        /* Read pointer to next buffer before we free the current buffer. */
203        next_buffer_ptr = *(cvmx_buf_ptr_t*)cvmx_phys_to_ptr(buffer_ptr.s.addr - 8);
204        cvmx_fpa_free(cvmx_phys_to_ptr(start_of_buffer), buffer_ptr.s.pool, 0);
205        buffer_ptr = next_buffer_ptr;
206    }
207}
208
209#endif /* CVMX_ENABLE_HELPER_FUNCTIONS */
210
211/**
212 * Returns the interface number for an IPD/PKO port number.
213 *
214 * @param ipd_port IPD/PKO port number
215 *
216 * @return Interface number
217 */
218extern int cvmx_helper_get_interface_num(int ipd_port);
219
220
221/**
222 * Returns the interface index number for an IPD/PKO port
223 * number.
224 *
225 * @param ipd_port IPD/PKO port number
226 *
227 * @return Interface index number
228 */
229extern int cvmx_helper_get_interface_index_num(int ipd_port);
230
231/**
232 * Initialize the internal QLM JTAG logic to allow programming
233 * of the JTAG chain by the cvmx_helper_qlm_jtag_*() functions.
234 * These functions should only be used at the direction of Cavium
235 * Networks. Programming incorrect values into the JTAG chain
236 * can cause chip damage.
237 */
238extern void cvmx_helper_qlm_jtag_init(void);
239
240/**
241 * Write up to 32bits into the QLM jtag chain. Bits are shifted
242 * into the MSB and out the LSB, so you should shift in the low
243 * order bits followed by the high order bits. The JTAG chain is
244 * 4 * 268 bits long, or 1072.
245 *
246 * @param qlm    QLM to shift value into
247 * @param bits   Number of bits to shift in (1-32).
248 * @param data   Data to shift in. Bit 0 enters the chain first, followed by
249 *               bit 1, etc.
250 *
251 * @return The low order bits of the JTAG chain that shifted out of the
252 *         circle.
253 */
254extern uint32_t cvmx_helper_qlm_jtag_shift(int qlm, int bits, uint32_t data);
255
256/**
257 * Shift long sequences of zeros into the QLM JTAG chain. It is
258 * common to need to shift more than 32 bits of zeros into the
259 * chain. This function is a convience wrapper around
260 * cvmx_helper_qlm_jtag_shift() to shift more than 32 bits of
261 * zeros at a time.
262 *
263 * @param qlm    QLM to shift zeros into
264 * @param bits
265 */
266extern void cvmx_helper_qlm_jtag_shift_zeros(int qlm, int bits);
267
268/**
269 * Program the QLM JTAG chain into all lanes of the QLM. You must
270 * have already shifted in 268*4, or 1072 bits into the JTAG
271 * chain. Updating invalid values can possibly cause chip damage.
272 *
273 * @param qlm    QLM to program
274 */
275extern void cvmx_helper_qlm_jtag_update(int qlm);
276
277#endif  /* __CVMX_HELPER_H__ */
278