FreeCalypso > hg > freecalypso-tools

annotate rvinterf/include/limits.h @ 985:d50df222c274

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pln-ppb-test: set up Calypso MEMIF
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 02 Dec 2023 23:39:33 +0000
parents ca6e969be6ee
children
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1 /*
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2 * For sizing our buffers etc in the rvinterf suite, including the local
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3 * UNIX domain socket protocol between rvinterf and fc-tmsh etc, we need
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4 * to have some limits on the message sizes in both host->target and
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5 * target->host directions.
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6 *
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7 * For the host->target direction, the choice of message size limit is
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8 * easy: the packet Rx code in RVT on the target side also has a limit
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9 * (quite naturally, as it needs to use a static buffer to reassemble
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10 * incoming packets as they arrive at the UART in unpredictable interrupt-
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11 * sized chunks), so we set our limit to match that in RVT.
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12 */
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14 #define MAX_PKT_TO_TARGET 255
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16 /*
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17 * In the other direction (target->host), there is no fixed limit
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18 * definition easily visible in the target fw code: any fw component
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19 * can call rvt_send_trace_cpy() or rvt_mem_alloc() followed by
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20 * rvt_send_trace_no_cpy(), or some higher-level API that reduces to
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21 * these functions, with a message of any size, subject only to memory
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22 * limits, which obviously aren't as strict as a #define'd maximum
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ca6e969be6ee rvinterf suite: raise MAX_PKT_FROM_TARGET to 1600
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23 * message size.
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24 *
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25 * With current FreeCalypso fw, unchanged from classic TCS211 in this
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26 * aspect, the largest RVTMUX packets emitted by the fw are G23M PS
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27 * primitives forwarded externally via GPF routing mechanism, and some
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28 * of them exceed our previous arbitrary limit of 512 bytes. However,
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29 * the largest output packet size that can be generated via this
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30 * mechanism equals the largest partition size in GPF partition pool
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31 * configuration, and that largest size is 1600 bytes. Hence we have
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32 * our answer as to what maximum packet size we need to support.
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33 */
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34
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35 #define MAX_PKT_FROM_TARGET 1600
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37 /*
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38 * Both limit definitions above counts all bytes between the opening and
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39 * closing STX flags, but not DLEs inserted for binary transparency.
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40 */