X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fdpif-provider.h;h=c33faf12ea324ba33f98ee67f2c5eb1015e39b47;hb=39a501148a3d02974e32cb1a76ef3d6ba3c38419;hp=020d0670864408bf738d2ebb14dfde82d7658373;hpb=5792c5c64a194304b554e2c6b9a9a4c0216c08a4;p=openvswitch

diff --git a/lib/dpif-provider.h b/lib/dpif-provider.h
index 020d0670..c33faf12 100644
--- a/lib/dpif-provider.h
+++ b/lib/dpif-provider.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009 Nicira Networks.
+ * Copyright (c) 2009, 2010 Nicira Networks.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -42,7 +42,7 @@ static inline void dpif_assert_class(const struct dpif *dpif,
 }
 
 /* Datapath interface class structure, to be defined by each implementation of
- * a datapath interface
+ * a datapath interface.
  *
  * These functions return 0 if successful or a positive errno value on failure,
  * except where otherwise noted.
@@ -52,7 +52,7 @@ static inline void dpif_assert_class(const struct dpif *dpif,
  * EWOULDBLOCK or EINPROGRESS.  We may relax this requirement in the future if
  * and when we encounter performance problems. */
 struct dpif_class {
-    /* Prefix for names of dpifs in this class, e.g. "udatapath:".
+    /* Prefix for names of dpifs in this class, e.g. "netdev:".
      *
      * One dpif class may have the empty string "" as its prefix, in which case
      * that dpif class is associated with dpif names that don't match any other
@@ -70,6 +70,17 @@ struct dpif_class {
      * to be called. */
     void (*wait)(void);
 
+    /* Enumerates the names of all known created datapaths, if possible, into
+     * 'all_dps'.  The caller has already initialized 'all_dps' and other dpif
+     * classes might already have added names to it.
+     *
+     * This is used by the vswitch at startup, so that it can delete any
+     * datapaths that are not configured.
+     *
+     * Some kinds of datapaths might not be practically enumerable, in which
+     * case this function may be a null pointer. */
+    int (*enumerate)(struct svec *all_dps);
+
     /* Attempts to open an existing dpif, if 'create' is false, or to open an
      * existing dpif or create a new one, if 'create' is true.  'name' is the
      * full dpif name provided by the user, e.g. "udatapath:/var/run/mypath".
@@ -85,6 +96,23 @@ struct dpif_class {
     /* Closes 'dpif' and frees associated memory. */
     void (*close)(struct dpif *dpif);
 
+    /* Enumerates all names that may be used to open 'dpif' into 'all_names'.
+     * The Linux datapath, for example, supports opening a datapath both by
+     * number, e.g. "dp0", and by the name of the datapath's local port.  For
+     * some datapaths, this might be an infinite set (e.g. in a file name,
+     * slashes may be duplicated any number of times), in which case only the
+     * names most likely to be used should be enumerated.
+     *
+     * The caller has already initialized 'all_names' and might already have
+     * added some names to it.  This function should not disturb any existing
+     * names in 'all_names'.
+     *
+     * If a datapath class does not support multiple names for a datapath, this
+     * function may be a null pointer.
+     *
+     * This is used by the vswitch at startup, */
+    int (*get_all_names)(const struct dpif *dpif, struct svec *all_names);
+
     /* Attempts to destroy the dpif underlying 'dpif'.
      *
      * If successful, 'dpif' will not be used again except as an argument for
@@ -126,6 +154,30 @@ struct dpif_class {
      * value. */
     int (*port_list)(const struct dpif *dpif, struct odp_port *ports, int n);
 
+    /* Polls for changes in the set of ports in 'dpif'.  If the set of ports in
+     * 'dpif' has changed, then this function should do one of the
+     * following:
+     *
+     * - Preferably: store the name of the device that was added to or deleted
+     *   from 'dpif' in '*devnamep' and return 0.  The caller is responsible
+     *   for freeing '*devnamep' (with free()) when it no longer needs it.
+     *
+     * - Alternatively: return ENOBUFS, without indicating the device that was
+     *   added or deleted.
+     *
+     * Occasional 'false positives', in which the function returns 0 while
+     * indicating a device that was not actually added or deleted or returns
+     * ENOBUFS without any change, are acceptable.
+     *
+     * If the set of ports in 'dpif' has not changed, returns EAGAIN.  May also
+     * return other positive errno values to indicate that something has gone
+     * wrong. */
+    int (*port_poll)(const struct dpif *dpif, char **devnamep);
+
+    /* Arranges for the poll loop to wake up when 'port_poll' will return a
+     * value other than EAGAIN. */
+    void (*port_poll_wait)(const struct dpif *dpif);
+
     /* Stores in 'ports' the port numbers of up to 'n' ports that belong to
      * 'group' in 'dpif'.  Returns the number of ports in 'group' (not the
      * number stored), if successful, otherwise a negative errno value. */
@@ -226,6 +278,25 @@ struct dpif_class {
      * corresponding type when it calls the recv member function. */
     int (*recv_set_mask)(struct dpif *dpif, int listen_mask);
 
+    /* Retrieves 'dpif''s sFlow sampling probability into '*probability'.
+     * Return value is 0 or a positive errno value.  EOPNOTSUPP indicates that
+     * the datapath does not support sFlow, as does a null pointer.
+     *
+     * '*probability' is expressed as the number of packets out of UINT_MAX to
+     * sample, e.g. probability/UINT_MAX is the probability of sampling a given
+     * packet. */
+    int (*get_sflow_probability)(const struct dpif *dpif,
+                                 uint32_t *probability);
+
+    /* Sets 'dpif''s sFlow sampling probability to 'probability'.  Return value
+     * is 0 or a positive errno value.  EOPNOTSUPP indicates that the datapath
+     * does not support sFlow, as does a null pointer.
+     *
+     * 'probability' is expressed as the number of packets out of UINT_MAX to
+     * sample, e.g. probability/UINT_MAX is the probability of sampling a given
+     * packet. */
+    int (*set_sflow_probability)(struct dpif *dpif, uint32_t probability);
+
     /* Attempts to receive a message from 'dpif'.  If successful, stores the
      * message into '*packetp'.  The message, if one is received, must begin
      * with 'struct odp_msg' as a header.  Only messages of the types selected
@@ -241,5 +312,6 @@ struct dpif_class {
 };
 
 extern const struct dpif_class dpif_linux_class;
+extern const struct dpif_class dpif_netdev_class;
 
 #endif /* dpif-provider.h */