X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvpp%2Fapi%2Fvpe.api;h=3a35a54a23ac48fc27c658a605e621f3ab78f858;hb=c8d8770a3e09c300eeff461a11ef3723b8e029cb;hp=e784fa01f085eb5800e96c04469914edd85c906c;hpb=0f971d8c22adf89d3f8592ac0d207727f2b1a23a;p=vpp.git

diff --git a/src/vpp/api/vpe.api b/src/vpp/api/vpe.api
index e784fa01f08..3a35a54a23a 100644
--- a/src/vpp/api/vpe.api
+++ b/src/vpp/api/vpe.api
@@ -26,7 +26,7 @@
  * IP APIs: see .../src/vnet/ip/{ip.api, ip_api.c}
  * TAP APIs: see .../src/vnet/unix/{tap.api, tap_api.c}
  * VXLAN APIs: see .../src/vnet/vxlan/{vxlan.api, vxlan_api.c}
- * AF-PACKET APIs: ... see /vnet/devices/af_packet/{af_packet.api, af_packet_api.c}
+ * AF-PACKET APIs: see ... /vnet/devices/af_packet/{af_packet.api, af_packet_api.c}
  * NETMAP APIs: see ... /src/vnet/devices/netmap/{netmap.api, netmap_api.c}
  * VHOST-USER APIs: see .../vnet/devices/virtio/{vhost_user.api, vhost_user_api.c}
  * VXLAN GPE APIs: see .../src/vnet/vxlan-gpe/{vxlan_gpe.api, vxlan_gpe_api.c}
@@ -40,7 +40,10 @@
  * LISP-GPE APIs: see .../src/vnet/lisp-gpe/{lisp_gpe.api, lisp_gpe_api.c}
  * MPLS APIs: see .../src/vnet/mpls/{mpls.api, mpls_api.c}
  * SR APIs: see .../src/vnet/sr/{sr.api, sr_api.c}
- * DPDK APIs: ... see /src/vnet/devices/dpdk/{dpdk.api, dpdk_api.c}
+ * DPDK APIs: see ... /src/vnet/devices/dpdk/{dpdk.api, dpdk_api.c}
+ * CLASSIFY APIs: see ... /src/vnet/classify/{classify.api, classify_api.c}
+ * FLOW APIs: see ... /src/vnet/flow/{flow.api, flow_api.c}
+ * DHCP APIs: see ... /src/vnet/dhcp/{dhcpk.api, dhcp_api.c}
  */
 
 /** \brief Create a new subinterface with the given vlan id
@@ -228,6 +231,31 @@ manual_print manual_endian define vnet_ip4_fib_counters
   vl_api_ip4_fib_counter_t c[count];
 };
 
+typeonly manual_print manual_endian define ip4_nbr_counter
+{
+  u32 address;
+  u8  link_type;
+  u64 packets;
+  u64 bytes;
+};
+
+/**
+ * @brief Per-neighbour (i.e. per-adjacency) coutners
+ * @param count The size of the array of counters
+ * @param sw_if_index The interface the adjacency is on
+ * @param begin Flag to indicate this is the first set of stats for this
+ *        interface. If this flag is not set the it is a continuation of
+ *        stats for this interface
+ * @param  c counters
+ */
+manual_print manual_endian define vnet_ip4_nbr_counters
+{
+  u32 count;
+  u32 sw_if_index;
+  u8 begin;
+  vl_api_ip4_nbr_counter_t c[count];
+};
+
 typeonly manual_print manual_endian define ip6_fib_counter
 {
   u64 address[2];
@@ -243,6 +271,22 @@ manual_print manual_endian define vnet_ip6_fib_counters
   vl_api_ip6_fib_counter_t c[count];
 };
 
+typeonly manual_print manual_endian define ip6_nbr_counter
+{
+  u64 address[2];
+  u8  link_type;
+  u64 packets;
+  u64 bytes;
+};
+
+manual_print manual_endian define vnet_ip6_nbr_counters
+{
+  u32 count;
+  u32 sw_if_index;
+  u8 begin;
+  vl_api_ip6_nbr_counter_t c[count];
+};
+
 /** \brief Request for a single block of summary stats
     @param client_index - opaque cookie to identify the sender
     @param context - sender context, to match reply w/ request
@@ -355,68 +399,6 @@ define reset_fib_reply
   i32 retval;
 };
 
-/** \brief DHCP Proxy config add / del request
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-    @param vrf_id - vrf id
-    @param if_ipv6 - ipv6 if non-zero, else ipv4
-    @param is_add - add the config if non-zero, else delete
-    @param insert_circuit_id - option82 suboption 1 fib number
-    @param dhcp_server[] - server address
-    @param dhcp_src_address[] - <fix this, need details>
-*/
-define dhcp_proxy_config
-{
-  u32 client_index;
-  u32 context;
-  u32 vrf_id;
-  u8 is_ipv6;
-  u8 is_add;
-  u8 insert_circuit_id;
-  u8 dhcp_server[16];
-  u8 dhcp_src_address[16];
-};
-
-/** \brief DHCP Proxy config response
-    @param context - sender context, to match reply w/ request
-    @param retval - return code for the request
-*/
-define dhcp_proxy_config_reply
-{
-  u32 context;
-  i32 retval;
-};
-
-/** \brief DHCP Proxy set / unset vss request
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-    @param tbl_id - table id
-    @param oui - first part of vpn id
-    @param fib_id - second part of vpn id
-    @param is_ipv6 - ip6 if non-zero, else ip4
-    @param is_add - set vss if non-zero, else delete
-*/
-define dhcp_proxy_set_vss
-{
-  u32 client_index;
-  u32 context;
-  u32 tbl_id;
-  u32 oui;
-  u32 fib_id;
-  u8 is_ipv6;
-  u8 is_add;
-};
-
-/** \brief DHCP proxy set / unset vss response
-    @param context - sender context, to match reply w/ request
-    @param retval - return code for the request
-*/
-define dhcp_proxy_set_vss_reply
-{
-  u32 context;
-  i32 retval;
-};
-
 /** \brief Create loopback interface request
     @param client_index - opaque cookie to identify the sender
     @param context - sender context, to match reply w/ request
@@ -685,109 +667,6 @@ define bd_ip_mac_add_del_reply
   i32 retval;
 };
 
-/** \brief Add/Delete classification table request
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-    @param is_add- if non-zero add the table, else delete it
-    @param del_chain - if non-zero delete the whole chain of tables
-    @param table_index - if add, reuturns index of the created table, else specifies the table to delete  
-    @param nbuckets - number of buckets when adding a table
-    @param memory_size - memory size when adding a table
-    @param match_n_vectors - number of match vectors
-    @param next_table_index - index of next table
-    @param miss_next_index - index of miss table
-    @param current_data_flag - option to use current node's packet payload
-            as the starting point from where packets are classified,
-            This option is only valid for L2/L3 input ACL for now.
-            0: by default, classify data from the buffer's start location
-            1: classify packets from VPP node’s current data pointer
-    @param current_data_offset - a signed value to shift the start location of
-            the packet to be classified
-            For example, if input IP ACL node is used, L2 header’s first byte
-            can be accessible by configuring current_data_offset to -14
-            if there is no vlan tag.
-            This is valid only if current_data_flag is set to 1.
-    @param mask[] - match mask
-*/
-define classify_add_del_table
-{
-  u32 client_index;
-  u32 context;
-  u8 is_add;
-  u8 del_chain;
-  u32 table_index;
-  u32 nbuckets;
-  u32 memory_size;
-  u32 skip_n_vectors;
-  u32 match_n_vectors;
-  u32 next_table_index;
-  u32 miss_next_index;
-  u32 current_data_flag;
-  i32 current_data_offset;
-  u8 mask[0];
-};
-
-/** \brief Add/Delete classification table response
-    @param context - sender context, to match reply w/ request
-    @param retval - return code for the table add/del requst
-    @param new_table_index - for add, returned index of the new table
-    @param skip_n_vectors - for add, returned value of skip_n_vectors in table
-    @param match_n_vectors -for add, returned value of match_n_vectors in table
-*/
-define classify_add_del_table_reply
-{
-  u32 context;
-  i32 retval;
-  u32 new_table_index;
-  u32 skip_n_vectors;
-  u32 match_n_vectors;
-};
-
-/** \brief Classify add / del session request
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-    @param is_add - add session if non-zero, else delete
-    @param table_index - index of the table to add/del the session, required
-    @param hit_next_index - for add, hit_next_index of new session, required
-    @param opaque_index - for add, opaque_index of new session
-    @param advance -for add, advance value for session
-    @param action -
-           0: no action (by default)
-              metadata is not used.
-           1: Classified IP packets will be looked up from the
-              specified ipv4 fib table (configured by metadata as VRF id).
-              Only valid for L3 input ACL node
-           2: Classified IP packets will be looked up from the
-              specified ipv6 fib table (configured by metadata as VRF id).
-              Only valid for L3 input ACL node
-    @param metadata - valid only if action != 0
-           VRF id if action is 1 or 2.
-    @param match[] - for add, match value for session, required
-*/
-define classify_add_del_session
-{
-  u32 client_index;
-  u32 context;
-  u8 is_add;
-  u32 table_index;
-  u32 hit_next_index;
-  u32 opaque_index;
-  i32 advance;
-  u8 action;
-  u32 metadata;
-  u8 match[0];
-};
-
-/** \brief Classify add / del session response
-    @param context - sender context, to match reply w/ request
-    @param retval - return code for the add/del session request
-*/
-define classify_add_del_session_reply
-{
-  u32 context;
-  i32 retval;
-};
-
 /** \brief Set/unset the classification table for an interface request 
     @param client_index - opaque cookie to identify the sender
     @param context - sender context, to match reply w/ request
@@ -894,40 +773,6 @@ define add_node_next_reply
   u32 next_index;
 };
 
-/** \brief DHCP Proxy config 2 add / del request
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-    @param rx_vrf_id - receive vrf id
-    @param server_vrf_id - server vrf id
-    @param if_ipv6 - ipv6 if non-zero, else ipv4
-    @param is_add - add the config if non-zero, else delete
-    @param insert_circuit_id - option82 suboption 1 fib number
-    @param dhcp_server[] - server address
-    @param dhcp_src_address[] - <fix this, need details>
-*/
-define dhcp_proxy_config_2
-{
-  u32 client_index;
-  u32 context;
-  u32 rx_vrf_id;
-  u32 server_vrf_id;
-  u8 is_ipv6;
-  u8 is_add;
-  u8 insert_circuit_id;
-  u8 dhcp_server[16];
-  u8 dhcp_src_address[16];
-};
-
-/** \brief DHCP Proxy config 2 add / del response
-    @param context - sender context, to match reply w/ request
-    @param retval - return code for request
-*/
-define dhcp_proxy_config_2_reply
-{
-  u32 context;
-  i32 retval;
-};
-
 /** \brief L2 interface ethernet flow point filtering enable/disable request
     @param client_index - opaque cookie to identify the sender
     @param context - sender context, to match reply w/ request
@@ -1143,37 +988,6 @@ define ip6_nd_event
   u8 mac_ip;
 };
     
-/** \brief DHCP Client config add / del request
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-    @param sw_if_index - index of the interface for DHCP client
-    @param hostname - hostname
-    @param is_add - add the config if non-zero, else delete
-    @param want_dhcp_event - DHCP event sent to the sender
-           via dhcp_compl_event API message if non-zero
-    @param pid - sender's pid
-*/
-define dhcp_client_config
-{
-  u32 client_index;
-  u32 context;
-  u32 sw_if_index;
-  u8 hostname[64];
-  u8 is_add;
-  u8 want_dhcp_event;
-  u32 pid;
-};
-
-/** \brief DHCP Client config response
-    @param context - sender context, to match reply w/ request
-    @param retval - return code for the request
-*/
-define dhcp_client_config_reply
-{
-  u32 context;
-  i32 retval;
-};
-
 /** \brief Set/unset input ACL interface
     @param client_index - opaque cookie to identify the sender
     @param context - sender context, to match reply w/ request
@@ -1206,25 +1020,6 @@ define input_acl_set_interface_reply
   i32 retval;
 };
 
-/** \brief Tell client about a DHCP completion event
-    @param client_index - opaque cookie to identify the sender
-    @param pid - client pid registered to receive notification
-    @param is_ipv6 - if non-zero the address is ipv6, else ipv4
-    @param host_address - Host IP address
-    @param router_address - Router IP address
-    @param host_mac - Host MAC address
-*/
-define dhcp_compl_event
-{
-  u32 client_index;
-  u32 pid;
-  u8 hostname[64];
-  u8 is_ipv6;
-  u8 host_address[16];
-  u8 router_address[16];
-  u8 host_mac[6];
-};
-
 /** \brief cop: enable/disable junk filtration features on an interface
     @param client_index - opaque cookie to identify the sender
     @param context - sender context, to match reply w/ request
@@ -1491,391 +1286,6 @@ define policer_details
   u64 last_update_time;
 };
 
-/** \brief Set/unset policer classify interface
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-    @param sw_if_index - interface to set/unset policer classify
-    @param ip4_table_index - ip4 classify table index (~0 for skip)
-    @param ip6_table_index - ip6 classify table index (~0 for skip)
-    @param l2_table_index  -  l2 classify table index (~0 for skip)
-    @param is_add - Set if non-zero, else unset
-    Note: User is recommeneded to use just one valid table_index per call.
-          (ip4_table_index, ip6_table_index, or l2_table_index)
-*/
-define policer_classify_set_interface
-{
-  u32 client_index;
-  u32 context;
-  u32 sw_if_index;
-  u32 ip4_table_index;
-  u32 ip6_table_index;
-  u32 l2_table_index;
-  u8 is_add;
-};
-
-/** \brief Set/unset policer classify interface response
-    @param context - sender context, to match reply w/ request
-    @param retval - return value for request
-*/
-define policer_classify_set_interface_reply
-{
-  u32 context;
-  i32 retval;
-};
-
-/** \brief Get list of policer classify interfaces and tables
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-    @param type - classify table type
-*/
-define policer_classify_dump
-{
-  u32 client_index;
-  u32 context;
-  u8 type;
-};
-
-/** \brief Policer iclassify operational state response.
-    @param context - sender context, to match reply w/ request
-    @param sw_if_index - software interface index
-    @param table_index - classify table index
-*/
-define policer_classify_details
-{
-  u32 context;
-  u32 sw_if_index;
-  u32 table_index;
-};
-
-/** \brief Classify get table IDs request
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-*/
-define classify_table_ids
-{
-  u32 client_index;
-  u32 context;
-};
-
-/** \brief Reply for classify get table IDs request
-    @param context - sender context which was passed in the request
-    @param count - number of ids returned in response
-    @param ids - array of classify table ids
-*/
-define classify_table_ids_reply
-{
-  u32 context;
-  i32 retval;
-  u32 count;
-  u32 ids[count];
-};
-
-/** \brief Classify table ids by interface index request
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-    @param sw_if_index - index of the interface
-*/
-define classify_table_by_interface
-{
-  u32 client_index;
-  u32 context;
-  u32 sw_if_index;
-};
-
-/** \brief Reply for classify table id by interface index request
-    @param context - sender context which was passed in the request
-    @param count - number of ids returned in response
-    @param sw_if_index - index of the interface
-    @param l2_table_id - l2 classify table index
-    @param ip4_table_id - ip4 classify table index
-    @param ip6_table_id - ip6 classify table index
-*/
-define classify_table_by_interface_reply
-{
-  u32 context;
-  i32 retval;
-  u32 sw_if_index;
-  u32 l2_table_id;
-  u32 ip4_table_id;
-  u32 ip6_table_id;
-};
-
-/** \brief Classify table info
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-    @param table_id - classify table index
-*/
-define classify_table_info
-{
-  u32 client_index;
-  u32 context;
-  u32 table_id;
-};
-
-/** \brief Reply for classify table info request
-    @param context - sender context which was passed in the request
-    @param count - number of ids returned in response
-    @param table_id - classify table index
-    @param nbuckets - number of buckets when adding a table
-    @param match_n_vectors - number of match vectors
-    @param skip_n_vectors - number of skip_n_vectors
-    @param active_sessions - number of sessions (active entries)
-    @param next_table_index - index of next table
-    @param miss_next_index - index of miss table
-    @param mask[] - match mask
-*/
-define classify_table_info_reply
-{
-  u32 context;
-  i32 retval;
-  u32 table_id;
-  u32 nbuckets;
-  u32 match_n_vectors;
-  u32 skip_n_vectors;
-  u32 active_sessions;
-  u32 next_table_index;
-  u32 miss_next_index;
-  u32 mask_length;
-  u8 mask[mask_length];
-};
-
-/** \brief Classify sessions dump request
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-    @param table_id - classify table index
-*/
-define classify_session_dump
-{
-  u32 client_index;
-  u32 context;
-  u32 table_id;
-};
-
-/** \brief Reply for classify table session dump request
-    @param context - sender context which was passed in the request
-    @param count - number of ids returned in response
-    @param table_id - classify table index
-    @param hit_next_index - hit_next_index of session
-    @param opaque_index - for add, opaque_index of session
-    @param advance - advance value of session
-    @param match[] - match value for session
-*/
-define classify_session_details
-{
-  u32 context;
-  i32 retval;
-  u32 table_id;
-  u32 hit_next_index;
-  i32 advance;
-  u32 opaque_index;
-  u32 match_length;
-  u8 match[match_length];
-};
-
-/** \brief Configure IPFIX exporter process request
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-    @param collector_address - address of IPFIX collector
-    @param collector_port - port of IPFIX collector
-    @param src_address - address of IPFIX exporter
-    @param vrf_id - VRF / fib table ID
-    @param path_mtu - Path MTU between exporter and collector
-    @param template_interval - number of seconds after which to resend template
-    @param udp_checksum - UDP checksum calculation enable flag
-*/
-define set_ipfix_exporter
-{
-  u32 client_index;
-  u32 context;
-  u8 collector_address[16];
-  u16 collector_port;
-  u8 src_address[16];
-  u32 vrf_id;
-  u32 path_mtu;
-  u32 template_interval;
-  u8 udp_checksum;
-};
-
-/** \brief Reply to IPFIX exporter configure request
-    @param context - sender context which was passed in the request
-*/
-define set_ipfix_exporter_reply
-{
-  u32 context;
-  i32 retval;
-};
-
-/** \brief IPFIX exporter dump request
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-*/
-define ipfix_exporter_dump
-{
-  u32 client_index;
-  u32 context;
-};
-
-/** \brief Reply to IPFIX exporter dump request
-    @param context - sender context which was passed in the request
-    @param collector_address - address of IPFIX collector
-    @param collector_port - port of IPFIX collector
-    @param src_address - address of IPFIX exporter
-    @param fib_index - fib table index
-    @param path_mtu - Path MTU between exporter and collector
-    @param template_interval - number of seconds after which to resend template
-    @param udp_checksum - UDP checksum calculation enable flag
-*/
-define ipfix_exporter_details
-{
-  u32 context;
-  u8 collector_address[16];
-  u16 collector_port;
-  u8 src_address[16];
-  u32 vrf_id;
-  u32 path_mtu;
-  u32 template_interval;
-  u8 udp_checksum;
-};
-
-/** \brief IPFIX classify stream configure request
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-    @param domain_id - domain ID reported in IPFIX messages for classify stream
-    @param src_port - source port of UDP session for classify stream
-*/
-define set_ipfix_classify_stream {
-    u32 client_index;
-    u32 context;
-    u32 domain_id;
-    u16 src_port;
-};
-
-/** \brief IPFIX classify stream configure response
-    @param context - sender context, to match reply w/ request
-    @param retval - return value for request
-*/
-define set_ipfix_classify_stream_reply {
-    u32 context;
-    i32 retval;
-};
-
-/** \brief IPFIX classify stream dump request
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-*/
-define ipfix_classify_stream_dump {
-    u32 client_index;
-    u32 context;
-};
-
-/** \brief Reply to IPFIX classify stream dump request
-    @param context - sender context, to match reply w/ request
-    @param domain_id - domain ID reported in IPFIX messages for classify stream
-    @param src_port - source port of UDP session for classify stream
-*/
-define ipfix_classify_stream_details {
-    u32 context;
-    u32 domain_id;
-    u16 src_port;
-};
-
-/** \brief IPFIX add or delete classifier table request
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-    @param table_id - classifier table ID
-    @param ip_version - version of IP used in the classifier table
-    @param transport_protocol - transport protocol used in the classifier table or 255 for unspecified
-*/
-define ipfix_classify_table_add_del {
-    u32 client_index;
-    u32 context;
-    u32 table_id;
-    u8 ip_version;
-    u8 transport_protocol;
-    u8 is_add;
-};
-
-/** \brief IPFIX add classifier table response
-    @param context - sender context which was passed in the request
-*/
-define ipfix_classify_table_add_del_reply {
-    u32 context;
-    i32 retval;
-};
-
-/** \brief IPFIX classify tables dump request
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-*/
-define ipfix_classify_table_dump {
-    u32 client_index;
-    u32 context;
-};
-
-/** \brief Reply to IPFIX classify tables dump request
-    @param context - sender context, to match reply w/ request
-    @param table_id - classifier table ID
-    @param ip_version - version of IP used in the classifier table
-    @param transport_protocol - transport protocol used in the classifier table or 255 for unspecified
-*/
-define ipfix_classify_table_details {
-    u32 context;
-    u32 table_id;
-    u8 ip_version;
-    u8 transport_protocol;
-};
-
-/** \brief Set/unset flow classify interface
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-    @param sw_if_index - interface to set/unset flow classify
-    @param ip4_table_index - ip4 classify table index (~0 for skip)
-    @param ip6_table_index - ip6 classify table index (~0 for skip)
-    @param l2_table_index  -  l2 classify table index (~0 for skip)
-    @param is_add - Set if non-zero, else unset
-    Note: User is recommeneded to use just one valid table_index per call.
-          (ip4_table_index, ip6_table_index, or l2_table_index)
-*/
-define flow_classify_set_interface {
-    u32 client_index;
-    u32 context;
-    u32 sw_if_index;
-    u32 ip4_table_index;
-    u32 ip6_table_index;
-    u8  is_add;
-};
-
-/** \brief Set/unset flow classify interface response
-    @param context - sender context, to match reply w/ request
-    @param retval - return value for request
-*/
-define flow_classify_set_interface_reply {
-    u32 context;
-    i32 retval;
-};
-
-/** \brief Get list of flow classify interfaces and tables
-    @param client_index - opaque cookie to identify the sender
-    @param context - sender context, to match reply w/ request
-    @param type - classify table type
-*/
-define flow_classify_dump {
-    u32 client_index;
-    u32 context;
-    u8 type;
-};
-
-/** \brief Flow classify operational state response.
-    @param context - sender context, to match reply w/ request
-    @param sw_if_index - software interface index
-    @param table_index - classify table index
-*/
-define flow_classify_details {
-    u32 context;
-    u32 sw_if_index;
-    u32 table_index;
-};
-
 /** \brief Query relative index via node names
     @param client_index - opaque cookie to identify the sender
     @param context - sender context, to match reply w/ request