peermux.h

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#ifndef _IPXE_PEERMUX_H
#define _IPXE_PEERMUX_H

/** @file
 *
 * Peer Content Caching and Retrieval (PeerDist) protocol multiplexer
 *
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

#include <stdint.h>
#include <ipxe/list.h>
#include <ipxe/refcnt.h>
#include <ipxe/interface.h>
#include <ipxe/process.h>
#include <ipxe/uri.h>
#include <ipxe/xferbuf.h>
#include <ipxe/pccrc.h>

/** Maximum number of concurrent block downloads */
#define PEERMUX_MAX_BLOCKS 32

/** PeerDist download content information cache */
struct peerdist_info_cache {
        /** Content information */
        struct peerdist_info info;
        /** Content information segment */
        struct peerdist_info_segment segment;
        /** Content information block */
        struct peerdist_info_block block;
};

/** A PeerDist multiplexed block download */
struct peerdist_multiplexed_block {
        /** PeerDist download multiplexer */
        struct peerdist_multiplexer *peermux;
        /** List of multiplexed blocks */
        struct list_head list;
        /** Data transfer interface */
        struct interface xfer;
};

/** PeerDist statistics */
struct peerdist_statistics {
        /** Maximum observed number of peers */
        unsigned int peers;
        /** Number of blocks downloaded in total */
        unsigned int total;
        /** Number of blocks downloaded from peers */
        unsigned int local;
};

/** A PeerDist download multiplexer */
struct peerdist_multiplexer {
        /** Reference count */
        struct refcnt refcnt;
        /** Data transfer interface */
        struct interface xfer;
        /** Content information interface */
        struct interface info;
        /** Original URI */
        struct uri *uri;

        /** Content information data transfer buffer */
        struct xfer_buffer buffer;
        /** Content information cache */
        struct peerdist_info_cache cache;

        /** Block download initiation process */
        struct process process;
        /** List of busy block downloads */
        struct list_head busy;
        /** List of idle block downloads */
        struct list_head idle;
        /** Block downloads */
        struct peerdist_multiplexed_block block[PEERMUX_MAX_BLOCKS];

        /** Statistics */
        struct peerdist_statistics stats;
};

extern int peermux_filter ( struct interface *xfer, struct interface *info,
                            struct uri *uri );

#endif /* _IPXE_PEERMUX_H */