From patchwork Thu Jun 23 11:34:35 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Chen X-Patchwork-Id: 9194915 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id DEB336075C for ; Thu, 23 Jun 2016 11:39:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CBFC026C2F for ; Thu, 23 Jun 2016 11:39:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BEAD22844E; Thu, 23 Jun 2016 11:39:04 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id CDB1726C2F for ; Thu, 23 Jun 2016 11:39:02 +0000 (UTC) Received: from localhost ([::1]:36036 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bG2yL-00089U-Ta for patchwork-qemu-devel@patchwork.kernel.org; Thu, 23 Jun 2016 07:39:02 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37561) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bG2u7-0003vi-C0 for qemu-devel@nongnu.org; Thu, 23 Jun 2016 07:34:41 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bG2u3-0003Rk-7n for qemu-devel@nongnu.org; Thu, 23 Jun 2016 07:34:39 -0400 Received: from [59.151.112.132] (port=60966 helo=heian.cn.fujitsu.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bG2u2-0003RC-2c for qemu-devel@nongnu.org; Thu, 23 Jun 2016 07:34:35 -0400 X-IronPort-AV: E=Sophos;i="5.22,518,1449504000"; d="scan'208";a="7997276" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 23 Jun 2016 19:34:26 +0800 Received: from G08CNEXCHPEKD02.g08.fujitsu.local (unknown [10.167.33.83]) by cn.fujitsu.com (Postfix) with ESMTP id 9DBA3498F595; Thu, 23 Jun 2016 19:34:24 +0800 (CST) Received: from G08FNSTD140215.g08.fujitsu.local (10.167.226.56) by G08CNEXCHPEKD02.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.279.2; Thu, 23 Jun 2016 19:34:24 +0800 From: Zhang Chen To: qemu devel , Jason Wang Date: Thu, 23 Jun 2016 19:34:35 +0800 Message-ID: <1466681677-30487-3-git-send-email-zhangchen.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1466681677-30487-1-git-send-email-zhangchen.fnst@cn.fujitsu.com> References: <1466681677-30487-1-git-send-email-zhangchen.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.56] X-yoursite-MailScanner-ID: 9DBA3498F595.A0944 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: zhangchen.fnst@cn.fujitsu.com X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 59.151.112.132 Subject: [Qemu-devel] [RFC PATCH V5 2/4] colo-compare: track connection and enqueue packet X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Li Zhijian , "eddie . dong" , "Dr . David Alan Gilbert" , Zhang Chen , zhanghailiang Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP In this patch we use kernel jhash table to track connection, and then enqueue net packet like this: + CompareState ++ | | +---------------+ +---------------+ +---------------+ |conn list +--->conn +--------->conn | +---------------+ +---------------+ +---------------+ | | | | | | +---------------+ +---v----+ +---v----+ +---v----+ +---v----+ |primary | |secondary |primary | |secondary |packet | |packet + |packet | |packet + +--------+ +--------+ +--------+ +--------+ | | | | +---v----+ +---v----+ +---v----+ +---v----+ |primary | |secondary |primary | |secondary |packet | |packet + |packet | |packet + +--------+ +--------+ +--------+ +--------+ | | | | +---v----+ +---v----+ +---v----+ +---v----+ |primary | |secondary |primary | |secondary |packet | |packet + |packet | |packet + +--------+ +--------+ +--------+ +--------+ Signed-off-by: Zhang Chen Signed-off-by: Li Zhijian Signed-off-by: Wen Congyang --- include/qemu/jhash.h | 61 ++++++++++++++++ net/Makefile.objs | 1 + net/colo-base.c | 194 +++++++++++++++++++++++++++++++++++++++++++++++++++ net/colo-base.h | 88 +++++++++++++++++++++++ net/colo-compare.c | 138 +++++++++++++++++++++++++++++++++++- trace-events | 3 + 6 files changed, 483 insertions(+), 2 deletions(-) create mode 100644 include/qemu/jhash.h create mode 100644 net/colo-base.c create mode 100644 net/colo-base.h diff --git a/include/qemu/jhash.h b/include/qemu/jhash.h new file mode 100644 index 0000000..0fcd875 --- /dev/null +++ b/include/qemu/jhash.h @@ -0,0 +1,61 @@ +/* jhash.h: Jenkins hash support. + * + * Copyright (C) 2006. Bob Jenkins (bob_jenkins@burtleburtle.net) + * + * http://burtleburtle.net/bob/hash/ + * + * These are the credits from Bob's sources: + * + * lookup3.c, by Bob Jenkins, May 2006, Public Domain. + * + * These are functions for producing 32-bit hashes for hash table lookup. + * hashword(), hashlittle(), hashlittle2(), hashbig(), mix(), and final() + * are externally useful functions. Routines to test the hash are +included + * if SELF_TEST is defined. You can use this free for any purpose. +It's in + * the public domain. It has no warranty. + * + * Copyright (C) 2009-2010 Jozsef Kadlecsik (kadlec@blackhole.kfki.hu) + * + * I've modified Bob's hash to be useful in the Linux kernel, and + * any bugs present are my fault. + * Jozsef + */ + +#ifndef QEMU_JHASH_H__ +#define QEMU_JHASH_H__ + +#include "qemu/bitops.h" + +/* + * hashtable relation copy from linux kernel jhash + */ + +/* __jhash_mix -- mix 3 32-bit values reversibly. */ +#define __jhash_mix(a, b, c) \ +{ \ + a -= c; a ^= rol32(c, 4); c += b; \ + b -= a; b ^= rol32(a, 6); a += c; \ + c -= b; c ^= rol32(b, 8); b += a; \ + a -= c; a ^= rol32(c, 16); c += b; \ + b -= a; b ^= rol32(a, 19); a += c; \ + c -= b; c ^= rol32(b, 4); b += a; \ +} + +/* __jhash_final - final mixing of 3 32-bit values (a,b,c) into c */ +#define __jhash_final(a, b, c) \ +{ \ + c ^= b; c -= rol32(b, 14); \ + a ^= c; a -= rol32(c, 11); \ + b ^= a; b -= rol32(a, 25); \ + c ^= b; c -= rol32(b, 16); \ + a ^= c; a -= rol32(c, 4); \ + b ^= a; b -= rol32(a, 14); \ + c ^= b; c -= rol32(b, 24); \ +} + +/* An arbitrary initial parameter */ +#define JHASH_INITVAL 0xdeadbeef + +#endif /* QEMU_JHASH_H__ */ diff --git a/net/Makefile.objs b/net/Makefile.objs index ba92f73..119589f 100644 --- a/net/Makefile.objs +++ b/net/Makefile.objs @@ -17,3 +17,4 @@ common-obj-y += filter.o common-obj-y += filter-buffer.o common-obj-y += filter-mirror.o common-obj-y += colo-compare.o +common-obj-y += colo-base.o diff --git a/net/colo-base.c b/net/colo-base.c new file mode 100644 index 0000000..7e263e8 --- /dev/null +++ b/net/colo-base.c @@ -0,0 +1,194 @@ +/* + * COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO) + * (a.k.a. Fault Tolerance or Continuous Replication) + * + * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD. + * Copyright (c) 2016 FUJITSU LIMITED + * Copyright (c) 2016 Intel Corporation + * + * Author: Zhang Chen + * + * This work is licensed under the terms of the GNU GPL, version 2 or + * later. See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "qemu/error-report.h" +#include "net/colo-base.h" + +uint32_t connection_key_hash(const void *opaque) +{ + const ConnectionKey *key = opaque; + uint32_t a, b, c; + + /* Jenkins hash */ + a = b = c = JHASH_INITVAL + sizeof(*key); + a += key->src.s_addr; + b += key->dst.s_addr; + c += (key->src_port | key->dst_port << 16); + __jhash_mix(a, b, c); + + a += key->ip_proto; + __jhash_final(a, b, c); + + return c; +} + +int connection_key_equal(const void *key1, const void *key2) +{ + return memcmp(key1, key2, sizeof(ConnectionKey)) == 0; +} + +int parse_packet_early(Packet *pkt) +{ + int network_length; + uint8_t *data = pkt->data; + uint16_t l3_proto; + ssize_t l2hdr_len = eth_get_l2_hdr_length(data); + + if (pkt->size < ETH_HLEN) { + error_report("pkt->size < ETH_HLEN"); + return 1; + } + pkt->network_layer = data + ETH_HLEN; + l3_proto = eth_get_l3_proto(data, l2hdr_len); + if (l3_proto != ETH_P_IP) { + return 1; + } + + network_length = pkt->ip->ip_hl * 4; + if (pkt->size < ETH_HLEN + network_length) { + error_report("pkt->size < network_layer + network_length"); + return 1; + } + pkt->transport_layer = pkt->network_layer + network_length; + if (!pkt->transport_layer) { + error_report("pkt->transport_layer is valid"); + return 1; + } + + return 0; +} + +void fill_connection_key(Packet *pkt, ConnectionKey *key, int mode) +{ + uint32_t tmp_ports; + + key->ip_proto = pkt->ip->ip_p; + + switch (key->ip_proto) { + case IPPROTO_TCP: + case IPPROTO_UDP: + case IPPROTO_DCCP: + case IPPROTO_ESP: + case IPPROTO_SCTP: + case IPPROTO_UDPLITE: + tmp_ports = *(uint32_t *)(pkt->transport_layer); + if (mode) { + key->src = pkt->ip->ip_src; + key->dst = pkt->ip->ip_dst; + key->src_port = ntohs(tmp_ports & 0xffff); + key->dst_port = ntohs(tmp_ports >> 16); + } else { + key->dst = pkt->ip->ip_src; + key->src = pkt->ip->ip_dst; + key->dst_port = ntohs(tmp_ports & 0xffff); + key->src_port = ntohs(tmp_ports >> 16); + } + break; + case IPPROTO_AH: + tmp_ports = *(uint32_t *)(pkt->transport_layer + 4); + if (mode) { + key->src = pkt->ip->ip_src; + key->dst = pkt->ip->ip_dst; + key->src_port = ntohs(tmp_ports & 0xffff); + key->dst_port = ntohs(tmp_ports >> 16); + } else { + key->dst = pkt->ip->ip_src; + key->src = pkt->ip->ip_dst; + key->dst_port = ntohs(tmp_ports & 0xffff); + key->src_port = ntohs(tmp_ports >> 16); + } + break; + default: + key->src_port = 0; + key->dst_port = 0; + break; + } +} + +Connection *connection_new(ConnectionKey *key) +{ + Connection *conn = g_slice_new(Connection); + + conn->ip_proto = key->ip_proto; + conn->processing = false; + g_queue_init(&conn->primary_list); + g_queue_init(&conn->secondary_list); + + return conn; +} + +void connection_destroy(void *opaque) +{ + Connection *conn = opaque; + + g_queue_foreach(&conn->primary_list, packet_destroy, NULL); + g_queue_free(&conn->primary_list); + g_queue_foreach(&conn->secondary_list, packet_destroy, NULL); + g_queue_free(&conn->secondary_list); + g_slice_free(Connection, conn); +} + +Packet *packet_new(const void *data, int size) +{ + Packet *pkt = g_slice_new(Packet); + + pkt->data = g_memdup(data, size); + pkt->size = size; + + return pkt; +} + +void packet_destroy(void *opaque, void *user_data) +{ + Packet *pkt = opaque; + + g_free(pkt->data); + g_slice_free(Packet, pkt); +} + +/* + * Clear hashtable, stop this hash growing really huge + */ +void connection_hashtable_reset(GHashTable *connection_track_table) +{ + g_hash_table_remove_all(connection_track_table); +} + +/* if not found, create a new connection and add to hash table */ +Connection *connection_get(GHashTable *connection_track_table, + ConnectionKey *key, + uint32_t *hashtable_size) +{ + /* FIXME: protect connection_track_table */ + Connection *conn = g_hash_table_lookup(connection_track_table, key); + + if (conn == NULL) { + ConnectionKey *new_key = g_memdup(key, sizeof(*key)); + + conn = connection_new(key); + + (*hashtable_size) += 1; + if (*hashtable_size > HASHTABLE_MAX_SIZE) { + error_report("colo proxy connection hashtable full, clear it"); + connection_hashtable_reset(connection_track_table); + *hashtable_size = 0; + /* TODO:clear conn_list */ + } + + g_hash_table_insert(connection_track_table, new_key, conn); + } + + return conn; +} diff --git a/net/colo-base.h b/net/colo-base.h new file mode 100644 index 0000000..01c1a5d --- /dev/null +++ b/net/colo-base.h @@ -0,0 +1,88 @@ +/* + * COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO) + * (a.k.a. Fault Tolerance or Continuous Replication) + * + * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD. + * Copyright (c) 2016 FUJITSU LIMITED + * Copyright (c) 2016 Intel Corporation + * + * Author: Zhang Chen + * + * This work is licensed under the terms of the GNU GPL, version 2 or + * later. See the COPYING file in the top-level directory. + */ + +#ifndef QEMU_COLO_BASE_H +#define QEMU_COLO_BASE_H + +#include "slirp/slirp.h" +#include "qemu/jhash.h" +#include "qemu/rcu.h" + +#define HASHTABLE_MAX_SIZE 16384 + +typedef enum colo_conn_state { + COLO_CONN_IDLE, + + /* States on the primary: For incoming connection */ + COLO_CONN_PRI_IN_SYN, /* Received Syn */ + COLO_CONN_PRI_IN_PSYNACK, /* Received syn/ack from primary, but not + yet from secondary */ + COLO_CONN_PRI_IN_SSYNACK, /* Received syn/ack from secondary, but + not yet from primary */ + COLO_CONN_PRI_IN_SYNACK, /* Received syn/ack from both */ + COLO_CONN_PRI_IN_ESTABLISHED, /* Got the ACK */ + + /* States on the secondary: For incoming connection */ + COLO_CONN_SEC_IN_SYNACK, /* We sent a syn/ack */ + COLO_CONN_SEC_IN_ACK, /* Saw the ack but didn't yet see our syn/ack */ + COLO_CONN_SEC_IN_ESTABLISHED, /* Got the ACK from the outside */ +} colo_conn_state; + +typedef struct Packet { + void *data; + union { + uint8_t *network_layer; + struct ip *ip; + }; + uint8_t *transport_layer; + int size; +} Packet; + +typedef struct ConnectionKey { + /* (src, dst) must be grouped, in the same way than in IP header */ + struct in_addr src; + struct in_addr dst; + uint16_t src_port; + uint16_t dst_port; + uint8_t ip_proto; +} QEMU_PACKED ConnectionKey; + +typedef struct Connection { + /* connection primary send queue: element type: Packet */ + GQueue primary_list; + /* connection secondary send queue: element type: Packet */ + GQueue secondary_list; + /* flag to enqueue unprocessed_connections */ + bool processing; + uint8_t ip_proto; + /* be used by filter-rewriter */ + colo_conn_state state; + tcp_seq primary_seq; + tcp_seq secondary_seq; +} Connection; + +uint32_t connection_key_hash(const void *opaque); +int connection_key_equal(const void *opaque1, const void *opaque2); +int parse_packet_early(Packet *pkt); +void fill_connection_key(Packet *pkt, ConnectionKey *key, int mode); +Connection *connection_new(ConnectionKey *key); +void connection_destroy(void *opaque); +Connection *connection_get(GHashTable *connection_track_table, + ConnectionKey *key, + uint32_t *hashtable_size); +void connection_hashtable_reset(GHashTable *connection_track_table); +Packet *packet_new(const void *data, int size); +void packet_destroy(void *opaque, void *user_data); + +#endif /* QEMU_COLO_BASE_H */ diff --git a/net/colo-compare.c b/net/colo-compare.c index a3e1456..4231fe7 100644 --- a/net/colo-compare.c +++ b/net/colo-compare.c @@ -28,6 +28,7 @@ #include "qemu/sockets.h" #include "qapi-visit.h" #include "trace.h" +#include "net/colo-base.h" #define TYPE_COLO_COMPARE "colo-compare" #define COLO_COMPARE(obj) \ @@ -38,6 +39,28 @@ static QTAILQ_HEAD(, CompareState) net_compares = QTAILQ_HEAD_INITIALIZER(net_compares); +/* + + CompareState ++ + | | + +---------------+ +---------------+ +---------------+ + |conn list +--->conn +--------->conn | + +---------------+ +---------------+ +---------------+ + | | | | | | + +---------------+ +---v----+ +---v----+ +---v----+ +---v----+ + |primary | |secondary |primary | |secondary + |packet | |packet + |packet | |packet + + +--------+ +--------+ +--------+ +--------+ + | | | | + +---v----+ +---v----+ +---v----+ +---v----+ + |primary | |secondary |primary | |secondary + |packet | |packet + |packet | |packet + + +--------+ +--------+ +--------+ +--------+ + | | | | + +---v----+ +---v----+ +---v----+ +---v----+ + |primary | |secondary |primary | |secondary + |packet | |packet + |packet | |packet + + +--------+ +--------+ +--------+ +--------+ +*/ typedef struct CompareState { Object parent; @@ -50,12 +73,103 @@ typedef struct CompareState { QTAILQ_ENTRY(CompareState) next; SocketReadState pri_rs; SocketReadState sec_rs; + + /* connection list: the connections belonged to this NIC could be found + * in this list. + * element type: Connection + */ + GQueue conn_list; + QemuMutex conn_list_lock; /* to protect conn_list */ + /* hashtable to save connection */ + GHashTable *connection_track_table; + /* to save unprocessed_connections */ + GQueue unprocessed_connections; + /* proxy current hash size */ + uint32_t hashtable_size; } CompareState; typedef struct CompareClass { ObjectClass parent_class; } CompareClass; +enum { + PRIMARY_IN = 0, + SECONDARY_IN, +}; + +static int compare_chr_send(CharDriverState *out, + const uint8_t *buf, + uint32_t size); + +/* + * Return 0 on success, if return -1 means the pkt + * is unsupported(arp and ipv6) and will be sent later + */ +static int packet_enqueue(CompareState *s, int mode) +{ + ConnectionKey key = {{ 0 } }; + Packet *pkt = NULL; + Connection *conn; + + if (mode == PRIMARY_IN) { + pkt = packet_new(s->pri_rs.buf, s->pri_rs.packet_len); + } else { + pkt = packet_new(s->sec_rs.buf, s->sec_rs.packet_len); + } + + if (parse_packet_early(pkt)) { + packet_destroy(pkt, NULL); + pkt = NULL; + return -1; + } + fill_connection_key(pkt, &key, PRIMARY_IN); + + conn = connection_get(s->connection_track_table, + &key, + &s->hashtable_size); + if (!conn->processing) { + qemu_mutex_lock(&s->conn_list_lock); + g_queue_push_tail(&s->conn_list, conn); + qemu_mutex_unlock(&s->conn_list_lock); + conn->processing = true; + } + + if (mode == PRIMARY_IN) { + g_queue_push_tail(&conn->primary_list, pkt); + } else { + g_queue_push_tail(&conn->secondary_list, pkt); + } + + return 0; +} + +static int compare_chr_send(CharDriverState *out, + const uint8_t *buf, + uint32_t size) +{ + int ret = 0; + uint32_t len = htonl(size); + + if (!size) { + return 0; + } + + ret = qemu_chr_fe_write_all(out, (uint8_t *)&len, sizeof(len)); + if (ret != sizeof(len)) { + goto err; + } + + ret = qemu_chr_fe_write_all(out, (uint8_t *)buf, size); + if (ret != size) { + goto err; + } + + return 0; + +err: + return ret < 0 ? ret : -EIO; +} + static char *compare_get_pri_indev(Object *obj, Error **errp) { CompareState *s = COLO_COMPARE(obj); @@ -103,12 +217,21 @@ static void compare_set_outdev(Object *obj, const char *value, Error **errp) static void compare_pri_rs_finalize(SocketReadState *pri_rs) { - /* if packet_enqueue pri pkt failed we will send unsupported packet */ + CompareState *s = container_of(pri_rs, CompareState, pri_rs); + + if (packet_enqueue(s, PRIMARY_IN)) { + trace_colo_compare_main("primary: unsupported packet in"); + compare_chr_send(s->chr_out, pri_rs->buf, pri_rs->packet_len); + } } static void compare_sec_rs_finalize(SocketReadState *sec_rs) { - /* if packet_enqueue sec pkt failed we will notify trace */ + CompareState *s = container_of(sec_rs, CompareState, sec_rs); + + if (packet_enqueue(s, SECONDARY_IN)) { + trace_colo_compare_main("secondary: unsupported packet in"); + } } /* @@ -161,6 +284,15 @@ static void colo_compare_complete(UserCreatable *uc, Error **errp) net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize); net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize); + g_queue_init(&s->conn_list); + qemu_mutex_init(&s->conn_list_lock); + s->hashtable_size = 0; + + s->connection_track_table = g_hash_table_new_full(connection_key_hash, + connection_key_equal, + g_free, + connection_destroy); + return; } @@ -203,6 +335,8 @@ static void colo_compare_finalize(Object *obj) if (!QTAILQ_EMPTY(&net_compares)) { QTAILQ_REMOVE(&net_compares, s, next); } + qemu_mutex_destroy(&s->conn_list_lock); + g_queue_free(&s->conn_list); g_free(s->pri_indev); g_free(s->sec_indev); diff --git a/trace-events b/trace-events index ca7211b..703de1a 100644 --- a/trace-events +++ b/trace-events @@ -1916,3 +1916,6 @@ aspeed_vic_update_fiq(int flags) "Raising FIQ: %d" aspeed_vic_update_irq(int flags) "Raising IRQ: %d" aspeed_vic_read(uint64_t offset, unsigned size, uint32_t value) "From 0x%" PRIx64 " of size %u: 0x%" PRIx32 aspeed_vic_write(uint64_t offset, unsigned size, uint32_t data) "To 0x%" PRIx64 " of size %u: 0x%" PRIx32 + +# net/colo-compare.c +colo_compare_main(const char *chr) ": %s"