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GET /api/patches/1529315/
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{
    "id": 1529315,
    "url": "http://patchwork.ozlabs.org/api/patches/1529315/",
    "web_url": "http://patchwork.ozlabs.org/project/ovn/patch/93952575174f6b204e70766ac1124e0defdefa80.1631873201.git.lorenzo.bianconi@redhat.com/",
    "project": {
        "id": 68,
        "url": "http://patchwork.ozlabs.org/api/projects/68/",
        "name": "Open Virtual Network development",
        "link_name": "ovn",
        "list_id": "ovs-dev.openvswitch.org",
        "list_email": "ovs-dev@openvswitch.org",
        "web_url": "http://openvswitch.org/",
        "scm_url": "",
        "webscm_url": "",
        "list_archive_url": "",
        "list_archive_url_format": "",
        "commit_url_format": ""
    },
    "msgid": "<93952575174f6b204e70766ac1124e0defdefa80.1631873201.git.lorenzo.bianconi@redhat.com>",
    "list_archive_url": null,
    "date": "2021-09-17T10:12:22",
    "name": "[ovs-dev,v5] controller: add datapath meter capability check",
    "commit_ref": null,
    "pull_url": null,
    "state": "superseded",
    "archived": false,
    "hash": "317e666e252cdbe2c7949e5f68ec6f24a482e3c6",
    "submitter": {
        "id": 73083,
        "url": "http://patchwork.ozlabs.org/api/people/73083/",
        "name": "Lorenzo Bianconi",
        "email": "lorenzo.bianconi@redhat.com"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/ovn/patch/93952575174f6b204e70766ac1124e0defdefa80.1631873201.git.lorenzo.bianconi@redhat.com/mbox/",
    "series": [
        {
            "id": 262776,
            "url": "http://patchwork.ozlabs.org/api/series/262776/",
            "web_url": "http://patchwork.ozlabs.org/project/ovn/list/?series=262776",
            "date": "2021-09-17T10:12:22",
            "name": "[ovs-dev,v5] controller: add datapath meter capability check",
            "version": 5,
            "mbox": "http://patchwork.ozlabs.org/series/262776/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/1529315/comments/",
    "check": "fail",
    "checks": "http://patchwork.ozlabs.org/api/patches/1529315/checks/",
    "tags": {},
    "related": [],
    "headers": {
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        "From": "Lorenzo Bianconi <lorenzo.bianconi@redhat.com>",
        "To": "ovs-dev@openvswitch.org",
        "Date": "Fri, 17 Sep 2021 12:12:22 +0200",
        "Message-Id": "\n <93952575174f6b204e70766ac1124e0defdefa80.1631873201.git.lorenzo.bianconi@redhat.com>",
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        "Cc": "dceara@redhat.com",
        "Subject": "[ovs-dev] [PATCH v5 ovn] controller: add datapath meter capability\n\tcheck",
        "X-BeenThere": "ovs-dev@openvswitch.org",
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        "List-Id": "<ovs-dev.openvswitch.org>",
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    },
    "content": "Dump datapath meter capabilities before configuring meters in\novn-controller\n\nSigned-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>\n---\nChanges since v4:\n- move rconn setup in ovs_feature_support_update and rename it in\n  ovs_feature_support_run\n- drop ovs_feature_support_init()\n- rename ovs_feature_support_deinit in ovs_feature_support_destroy\nChanges since v3:\n- add missing rconn_run_wait() and rconn_recv_wait() at the end of swconn for\n  loop\n- cosmetics\nChanges since v2:\n- move meter capability logic in lib/features.c\nChanges since v1:\n- move rconn in ovn-controller to avoid concurrency issues\n---\n controller/ovn-controller.c |  7 +--\n include/ovn/features.h      |  6 ++-\n lib/actions.c               |  3 ++\n lib/automake.mk             |  1 +\n lib/features.c              | 95 ++++++++++++++++++++++++++++++++++++-\n lib/test-ovn-features.c     |  6 +--\n tests/ovn.at                |  4 +-\n 7 files changed, 112 insertions(+), 10 deletions(-)",
    "diff": "diff --git a/controller/ovn-controller.c b/controller/ovn-controller.c\nindex 0031a1035..3347396f8 100644\n--- a/controller/ovn-controller.c\n+++ b/controller/ovn-controller.c\n@@ -3569,9 +3569,9 @@ main(int argc, char *argv[])\n              * 'br_int_dp' is valid only if an OVS transaction is possible.\n              */\n             if (ovs_idl_txn\n-                && ovs_feature_support_update(br_int_dp\n-                                              ? &br_int_dp->capabilities\n-                                              : NULL)) {\n+                && ovs_feature_support_run(br_int_dp ?\n+                                           &br_int_dp->capabilities : NULL,\n+                                           br_int ? br_int->name : NULL)) {\n                 VLOG_INFO(\"OVS feature set changed, force recompute.\");\n                 engine_set_force_recompute(true);\n             }\n@@ -3898,6 +3898,7 @@ loop_done:\n     ovsdb_idl_loop_destroy(&ovs_idl_loop);\n     ovsdb_idl_loop_destroy(&ovnsb_idl_loop);\n \n+    ovs_feature_support_destroy();\n     free(ovs_remote);\n     service_stop();\n \ndiff --git a/include/ovn/features.h b/include/ovn/features.h\nindex c35d59b14..d12a8eb0d 100644\n--- a/include/ovn/features.h\n+++ b/include/ovn/features.h\n@@ -28,13 +28,17 @@\n  */\n enum ovs_feature_support_bits {\n     OVS_CT_ZERO_SNAT_SUPPORT_BIT,\n+    OVS_DP_METER_SUPPORT_BIT,\n };\n \n enum ovs_feature_value {\n     OVS_CT_ZERO_SNAT_SUPPORT = (1 << OVS_CT_ZERO_SNAT_SUPPORT_BIT),\n+    OVS_DP_METER_SUPPORT = (1 << OVS_DP_METER_SUPPORT_BIT),\n };\n \n+void ovs_feature_support_destroy(void);\n bool ovs_feature_is_supported(enum ovs_feature_value feature);\n-bool ovs_feature_support_update(const struct smap *ovs_capabilities);\n+bool ovs_feature_support_run(const struct smap *ovs_capabilities,\n+                             const char *br_name);\n \n #endif\ndiff --git a/lib/actions.c b/lib/actions.c\nindex c572e88ae..7cf6be308 100644\n--- a/lib/actions.c\n+++ b/lib/actions.c\n@@ -87,6 +87,9 @@ encode_start_controller_op(enum action_opcode opcode, bool pause,\n     oc->max_len = UINT16_MAX;\n     oc->reason = OFPR_ACTION;\n     oc->pause = pause;\n+    if (!ovs_feature_is_supported(OVS_DP_METER_SUPPORT)) {\n+        meter_id = NX_CTLR_NO_METER;\n+    }\n     oc->meter_id = meter_id;\n \n     struct action_header ah = { .opcode = htonl(opcode) };\ndiff --git a/lib/automake.mk b/lib/automake.mk\nindex ddfe33948..9f9f447d5 100644\n--- a/lib/automake.mk\n+++ b/lib/automake.mk\n@@ -2,6 +2,7 @@ lib_LTLIBRARIES += lib/libovn.la\n lib_libovn_la_LDFLAGS = \\\n         $(OVS_LTINFO) \\\n         -Wl,--version-script=$(top_builddir)/lib/libovn.sym \\\n+        $(OVS_LIBDIR)/libopenvswitch.la \\\n         $(AM_LDFLAGS)\n lib_libovn_la_SOURCES = \\\n \tlib/acl-log.c \\\ndiff --git a/lib/features.c b/lib/features.c\nindex fddf4c450..3ec2d26af 100644\n--- a/lib/features.c\n+++ b/lib/features.c\n@@ -18,7 +18,14 @@\n #include <stdlib.h>\n \n #include \"lib/util.h\"\n+#include \"lib/dirs.h\"\n+#include \"socket-util.h\"\n+#include \"lib/vswitch-idl.h\"\n #include \"openvswitch/vlog.h\"\n+#include \"openvswitch/ofpbuf.h\"\n+#include \"openvswitch/rconn.h\"\n+#include \"openvswitch/ofp-msgs.h\"\n+#include \"openvswitch/ofp-meter.h\"\n #include \"ovn/features.h\"\n \n VLOG_DEFINE_THIS_MODULE(features);\n@@ -40,11 +47,15 @@ static uint32_t supported_ovs_features;\n \n static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 5);\n \n+/* ovs-vswitchd connection. */\n+static struct rconn *swconn;\n+\n static bool\n ovs_feature_is_valid(enum ovs_feature_value feature)\n {\n     switch (feature) {\n     case OVS_CT_ZERO_SNAT_SUPPORT:\n+    case OVS_DP_METER_SUPPORT:\n         return true;\n     default:\n         return false;\n@@ -58,9 +69,87 @@ ovs_feature_is_supported(enum ovs_feature_value feature)\n     return supported_ovs_features & feature;\n }\n \n+static void\n+ovs_feature_rconn_setup(const char *br_name)\n+{\n+    if (!swconn) {\n+        swconn = rconn_create(5, 0, DSCP_DEFAULT, 1 << OFP15_VERSION);\n+    }\n+\n+    if (swconn && !rconn_is_connected(swconn)) {\n+        char *target = xasprintf(\"unix:%s/%s.mgmt\", ovs_rundir(), br_name);\n+        if (strcmp(target, rconn_get_target(swconn))) {\n+            VLOG_INFO(\"%s: connecting to switch\", target);\n+            rconn_connect(swconn, target, target);\n+        }\n+        free(target);\n+    }\n+}\n+\n+static bool\n+ovs_feature_get_openflow_cap(const char *br_name)\n+{\n+    if (!br_name) {\n+        return false;\n+    }\n+\n+    ovs_feature_rconn_setup(br_name);\n+\n+    rconn_run(swconn);\n+    if (!rconn_is_connected(swconn)) {\n+        return false;\n+    }\n+\n+    bool ret = false;\n+    /* dump datapath meter capabilities. */\n+    struct ofpbuf *msg = ofpraw_alloc(OFPRAW_OFPST13_METER_FEATURES_REQUEST,\n+                                      rconn_get_version(swconn), 0);\n+    rconn_send(swconn, msg, NULL);\n+    for (int i = 0; i < 50; i++) {\n+        msg = rconn_recv(swconn);\n+        if (!msg) {\n+            break;\n+        }\n+\n+        const struct ofp_header *oh = msg->data;\n+        enum ofptype type;\n+        ofptype_decode(&type, oh);\n+\n+        if (type == OFPTYPE_METER_FEATURES_STATS_REPLY) {\n+            struct ofputil_meter_features mf;\n+            ofputil_decode_meter_features(oh, &mf);\n+\n+            bool old_state = supported_ovs_features & OVS_DP_METER_SUPPORT;\n+            bool new_state = mf.max_meters > 0;\n+\n+            if (old_state != new_state) {\n+                ret = true;\n+                if (new_state) {\n+                    supported_ovs_features |= OVS_DP_METER_SUPPORT;\n+                } else {\n+                    supported_ovs_features &= ~OVS_DP_METER_SUPPORT;\n+                }\n+            }\n+        }\n+        ofpbuf_delete(msg);\n+    }\n+    rconn_run_wait(swconn);\n+    rconn_recv_wait(swconn);\n+\n+    return ret;\n+}\n+\n+void\n+ovs_feature_support_destroy(void)\n+{\n+    rconn_destroy(swconn);\n+    swconn = NULL;\n+}\n+\n /* Returns 'true' if the set of tracked OVS features has been updated. */\n bool\n-ovs_feature_support_update(const struct smap *ovs_capabilities)\n+ovs_feature_support_run(const struct smap *ovs_capabilities,\n+                        const char *br_name)\n {\n     static struct smap empty_caps = SMAP_INITIALIZER(&empty_caps);\n     bool updated = false;\n@@ -69,6 +158,10 @@ ovs_feature_support_update(const struct smap *ovs_capabilities)\n         ovs_capabilities = &empty_caps;\n     }\n \n+    if (ovs_feature_get_openflow_cap(br_name)) {\n+        updated = true;\n+    }\n+\n     for (size_t i = 0; i < ARRAY_SIZE(all_ovs_features); i++) {\n         enum ovs_feature_value value = all_ovs_features[i].value;\n         const char *name = all_ovs_features[i].name;\ndiff --git a/lib/test-ovn-features.c b/lib/test-ovn-features.c\nindex deb97581e..aabc547e6 100644\n--- a/lib/test-ovn-features.c\n+++ b/lib/test-ovn-features.c\n@@ -26,15 +26,15 @@ test_ovn_features(struct ovs_cmdl_context *ctx OVS_UNUSED)\n     struct smap features = SMAP_INITIALIZER(&features);\n \n     smap_add(&features, \"ct_zero_snat\", \"false\");\n-    ovs_assert(!ovs_feature_support_update(&features));\n+    ovs_assert(!ovs_feature_support_run(&features, NULL));\n     ovs_assert(!ovs_feature_is_supported(OVS_CT_ZERO_SNAT_SUPPORT));\n \n     smap_replace(&features, \"ct_zero_snat\", \"true\");\n-    ovs_assert(ovs_feature_support_update(&features));\n+    ovs_assert(ovs_feature_support_run(&features, NULL));\n     ovs_assert(ovs_feature_is_supported(OVS_CT_ZERO_SNAT_SUPPORT));\n \n     smap_add(&features, \"unknown_feature\", \"true\");\n-    ovs_assert(!ovs_feature_support_update(&features));\n+    ovs_assert(!ovs_feature_support_run(&features, NULL));\n \n     smap_destroy(&features);\n }\ndiff --git a/tests/ovn.at b/tests/ovn.at\nindex 30625ec37..9e55c0d57 100644\n--- a/tests/ovn.at\n+++ b/tests/ovn.at\n@@ -1529,9 +1529,9 @@ log(verdict=allow, severity=warning);\n log(name=\"test1\", verdict=drop, severity=info);\n     encodes as controller(userdata=00.00.00.07.00.00.00.00.01.06.74.65.73.74.31)\n log(verdict=drop, severity=info, meter=\"meter1\");\n-    encodes as controller(userdata=00.00.00.07.00.00.00.00.01.06,meter_id=4)\n+    encodes as controller(userdata=00.00.00.07.00.00.00.00.01.06)\n log(name=\"test1\", verdict=drop, severity=info, meter=\"meter1\");\n-    encodes as controller(userdata=00.00.00.07.00.00.00.00.01.06.74.65.73.74.31,meter_id=4)\n+    encodes as controller(userdata=00.00.00.07.00.00.00.00.01.06.74.65.73.74.31)\n log(verdict=drop);\n     formats as log(verdict=drop, severity=info);\n     encodes as controller(userdata=00.00.00.07.00.00.00.00.01.06)\n",
    "prefixes": [
        "ovs-dev",
        "v5"
    ]
}