Date: Fri, 9 Nov 2018 08:43:40 +0000 (UTC) From: Vincenzo Maffione <vmaffione@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r340279 - in head: share/man/man4 tools/tools/netmap Message-ID: <201811090843.wA98he3j026223@repo.freebsd.org>
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Author: vmaffione Date: Fri Nov 9 08:43:40 2018 New Revision: 340279 URL: https://svnweb.freebsd.org/changeset/base/340279 Log: netmap: add load balancer program Add the lb program, which is able to load-balance input traffic received from a netmap port over M groups, with N netmap pipes in each group. Each received packet is forwarded to one of the pipes chosen from each group (using an L3/L4 connection-consistent hash function). This also adds a man page for lb and some cross-references in related man pages. Reviewed by: bcr, 0mp Approved by: gnn (mentor) Differential Revision: https://reviews.freebsd.org/D17735 Added: head/tools/tools/netmap/lb.8 (contents, props changed) head/tools/tools/netmap/lb.c (contents, props changed) head/tools/tools/netmap/pkt_hash.c (contents, props changed) head/tools/tools/netmap/pkt_hash.h (contents, props changed) Modified: head/share/man/man4/netmap.4 head/tools/tools/netmap/Makefile head/tools/tools/netmap/README head/tools/tools/netmap/bridge.8 head/tools/tools/netmap/ctrs.h Modified: head/share/man/man4/netmap.4 ============================================================================== --- head/share/man/man4/netmap.4 Fri Nov 9 08:15:58 2018 (r340278) +++ head/share/man/man4/netmap.4 Fri Nov 9 08:43:40 2018 (r340279) @@ -27,7 +27,7 @@ .\" .\" $FreeBSD$ .\" -.Dd October 23, 2018 +.Dd October 28, 2018 .Dt NETMAP 4 .Os .Sh NAME @@ -1073,8 +1073,11 @@ Other clients attached to the same switch can now communicate with the network card or the host. .Sh SEE ALSO -.Xr pkt-gen 8 , -.Xr bridge 8 +.Xr vale 4 , +.Xr vale-ctl 4 , +.Xr bridge 8 , +.Xr lb 8 , +.Xr pkt-gen 8 .Pp .Pa http://info.iet.unipi.it/~luigi/netmap/ .Pp Modified: head/tools/tools/netmap/Makefile ============================================================================== --- head/tools/tools/netmap/Makefile Fri Nov 9 08:15:58 2018 (r340278) +++ head/tools/tools/netmap/Makefile Fri Nov 9 08:43:40 2018 (r340279) @@ -3,7 +3,7 @@ # # For multiple programs using a single source file each, # we can just define 'progs' and create custom targets. -PROGS = pkt-gen nmreplay bridge vale-ctl +PROGS = pkt-gen nmreplay bridge vale-ctl lb CLEANFILES = $(PROGS) *.o MAN= @@ -34,3 +34,6 @@ nmreplay: nmreplay.o vale-ctl: vale-ctl.o $(CC) $(CFLAGS) -o vale-ctl vale-ctl.o + +lb: lb.o pkt_hash.o + $(CC) $(CFLAGS) -o lb lb.o pkt_hash.o $(LDFLAGS) Modified: head/tools/tools/netmap/README ============================================================================== --- head/tools/tools/netmap/README Fri Nov 9 08:15:58 2018 (r340278) +++ head/tools/tools/netmap/README Fri Nov 9 08:43:40 2018 (r340279) @@ -1,9 +1,13 @@ $FreeBSD$ -This directory contains examples that use netmap +This directory contains applications that use the netmap API - pkt-gen a packet sink/source using the netmap API + pkt-gen a multi-function packet generator and traffic sink - bridge a two-port jumper wire, also using the native API + bridge a two-port jumper wire, also using the netmap API - vale-ctl the program to control VALE bridges + vale-ctl the program to control and inspect VALE switches + + lb an L3/L4 load balancer + + nmreplay a tool to playback a pcap file to a netmap port Modified: head/tools/tools/netmap/bridge.8 ============================================================================== --- head/tools/tools/netmap/bridge.8 Fri Nov 9 08:15:58 2018 (r340278) +++ head/tools/tools/netmap/bridge.8 Fri Nov 9 08:43:40 2018 (r340279) @@ -23,7 +23,7 @@ .\" .\" $FreeBSD$ .\" -.Dd October 23, 2018 +.Dd October 28, 2018 .Dt BRIDGE 8 .Os .Sh NAME @@ -71,7 +71,8 @@ Disable zero-copy mode. .El .Sh SEE ALSO .Xr netmap 4 , -.Xr pkt-gen 8 +.Xr pkt-gen 8 , +.Xr lb 8 .Sh AUTHORS .An -nosplit .Nm Modified: head/tools/tools/netmap/ctrs.h ============================================================================== --- head/tools/tools/netmap/ctrs.h Fri Nov 9 08:15:58 2018 (r340278) +++ head/tools/tools/netmap/ctrs.h Fri Nov 9 08:43:40 2018 (r340279) @@ -7,30 +7,37 @@ /* counters to accumulate statistics */ struct my_ctrs { - uint64_t pkts, bytes, events, drop; + uint64_t pkts, bytes, events; + uint64_t drop, drop_bytes; uint64_t min_space; struct timeval t; + uint32_t oq_n; /* number of elements in overflow queue (used in lb) */ }; /* very crude code to print a number in normalized form. * Caller has to make sure that the buffer is large enough. */ static const char * -norm2(char *buf, double val, char *fmt) +norm2(char *buf, double val, char *fmt, int normalize) { char *units[] = { "", "K", "M", "G", "T" }; u_int i; - - for (i = 0; val >=1000 && i < sizeof(units)/sizeof(char *) - 1; i++) - val /= 1000; + if (normalize) + for (i = 0; val >=1000 && i < sizeof(units)/sizeof(char *) - 1; i++) + val /= 1000; + else + i=0; sprintf(buf, fmt, val, units[i]); return buf; } static __inline const char * -norm(char *buf, double val) +norm(char *buf, double val, int normalize) { - return norm2(buf, val, "%.3f %s"); + if (normalize) + return norm2(buf, val, "%.3f %s", normalize); + else + return norm2(buf, val, "%.0f %s", normalize); } static __inline int @@ -89,7 +96,7 @@ timespec_sub(struct timespec a, struct timespec b) return ret; } -static uint64_t +static __inline uint64_t wait_for_next_report(struct timeval *prev, struct timeval *cur, int report_interval) { @@ -106,3 +113,4 @@ wait_for_next_report(struct timeval *prev, struct time return delta.tv_sec* 1000000 + delta.tv_usec; } #endif /* CTRS_H_ */ + Added: head/tools/tools/netmap/lb.8 ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/tools/tools/netmap/lb.8 Fri Nov 9 08:43:40 2018 (r340279) @@ -0,0 +1,130 @@ +.\" Copyright (c) 2017 Corelight, Inc. and Universita` di Pisa +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" $FreeBSD$ +.\" +.Dd October 28, 2018 +.Dt LB 8 +.Os +.Sh NAME +.Nm lb +.Nd netmap-based load balancer +.Sh SYNOPSIS +.Bk -words +.Bl -tag -width "lb" +.It Nm +.Op Fl i Ar port +.Op Fl p Ar pipe-group +.Op Fl B Ar extra-buffers +.Op Fl b Ar batch-size +.Op Fl w Ar wait-link +.El +.Ek +.Sh DESCRIPTION +.Nm +reads packets from an input netmap port and sends them to a number of netmap pipes, +trying to balance the packets received by each pipe. +Packets belonging to the +same connection will always be sent to the same pipe. +.Pp +Command line options are listed below. +.Bl -tag -width Ds +.It Fl i Ar port +Name of a netmap port. +It must be supplied exactly once to identify +the input port. +Any netmap port type (e.g., physical interface, VALE switch, pipe, +monitor port) can be used. +.It Fl p Ar name Ns Cm \&: Ns Ar number | number +Add a new pipe group of the given number of pipes. +The pipe group will receive all the packets read from the input port, balanced +among the available pipes. +The receiving ends of the pipes +will be called +.Dq Ar name Ns Em }0 +to +.Dq Ar name No Ns Em } Ns Aq Ar number No - 1 . +The name is optional and defaults to +the name of the input port (stripped down of any netmap operator). +If the name is omitted, also the colon can be omitted. +.Pp +This option can be supplied multiple times to define a sequence of pipe groups, +each group receiving all the packets in turn. +.Pp +If no +.Fl p +option is given, a single group of two pipes with default name is assumed. +.Pp +It is allowed to use the same name for several groups. +The pipe numbering in each +group will start from were the previous identically-named group had left. +.It Fl B Ar extra-buffers +Try to reserve the given number of extra buffers. +Extra buffers are shared among +all pipes in all groups and work as an extension of the pipe rings. +If a pipe ring is full for whatever reason, +.Nm +tries to use extra buffers before dropping any packets directed to that pipe. +.Pp +If all extra buffers are busy, some are stolen from the pipe with the longest +backlog. +This gives preference to newer packets over old ones, and prevents a +stalled pipe to deplete the pool of extra buffers. +.It Fl b Ar batch-size +Maximum number of packets processed between two read operations from the input port. +Higher values of batch-size improve performance by amortizing read operations, +but increase the risk of filling up the port internal queues. +.It Fl w Ar wait-link +indicates the number of seconds to wait before transmitting. +It defaults to 2, and may be useful when talking to physical +ports to let link negotiation complete before starting transmission. +.El +.Sh LIMITATIONS +The group chaining assumes that the applications on the receiving end of the +pipes are read-only: they must not modify the buffers or the pipe ring slots +in any way. +.Pp +The group naming is currently implemented by creating a persistent VALE port +with the given name. +If +.Nm +does not exit cleanly the ports will not be removed. +Please use +.Xr vale-ctl 4 +to remove any stale persistent VALE port. +.Sh SEE ALSO +.Xr netmap 4 , +.Xr bridge 8 , +.Xr pkt-gen 8 +.Pp +.Pa http://info.iet.unipi.it/~luigi/netmap/ +.Sh AUTHORS +.An -nosplit +.Nm +has been written by +.An Seth Hall +at Corelight, USA. +The facilities related to extra buffers and pipe groups have been added by +.An Giuseppe Lettieri +at University of Pisa, Italy, under contract by Corelight, USA. Added: head/tools/tools/netmap/lb.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/tools/tools/netmap/lb.c Fri Nov 9 08:43:40 2018 (r340279) @@ -0,0 +1,1027 @@ +/* + * Copyright (C) 2017 Corelight, Inc. and Universita` di Pisa. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ +/* $FreeBSD$ */ +#include <stdio.h> +#include <string.h> +#include <ctype.h> +#include <stdbool.h> +#include <inttypes.h> +#include <syslog.h> + +#define NETMAP_WITH_LIBS +#include <net/netmap_user.h> +#include <sys/poll.h> + +#include <netinet/in.h> /* htonl */ + +#include <pthread.h> + +#include "pkt_hash.h" +#include "ctrs.h" + + +/* + * use our version of header structs, rather than bringing in a ton + * of platform specific ones + */ +#ifndef ETH_ALEN +#define ETH_ALEN 6 +#endif + +struct compact_eth_hdr { + unsigned char h_dest[ETH_ALEN]; + unsigned char h_source[ETH_ALEN]; + u_int16_t h_proto; +}; + +struct compact_ip_hdr { + u_int8_t ihl:4, version:4; + u_int8_t tos; + u_int16_t tot_len; + u_int16_t id; + u_int16_t frag_off; + u_int8_t ttl; + u_int8_t protocol; + u_int16_t check; + u_int32_t saddr; + u_int32_t daddr; +}; + +struct compact_ipv6_hdr { + u_int8_t priority:4, version:4; + u_int8_t flow_lbl[3]; + u_int16_t payload_len; + u_int8_t nexthdr; + u_int8_t hop_limit; + struct in6_addr saddr; + struct in6_addr daddr; +}; + +#define MAX_IFNAMELEN 64 +#define MAX_PORTNAMELEN (MAX_IFNAMELEN + 40) +#define DEF_OUT_PIPES 2 +#define DEF_EXTRA_BUFS 0 +#define DEF_BATCH 2048 +#define DEF_WAIT_LINK 2 +#define DEF_STATS_INT 600 +#define BUF_REVOKE 100 +#define STAT_MSG_MAXSIZE 1024 + +struct { + char ifname[MAX_IFNAMELEN]; + char base_name[MAX_IFNAMELEN]; + int netmap_fd; + uint16_t output_rings; + uint16_t num_groups; + uint32_t extra_bufs; + uint16_t batch; + int stdout_interval; + int syslog_interval; + int wait_link; + bool busy_wait; +} glob_arg; + +/* + * the overflow queue is a circular queue of buffers + */ +struct overflow_queue { + char name[MAX_IFNAMELEN + 16]; + struct netmap_slot *slots; + uint32_t head; + uint32_t tail; + uint32_t n; + uint32_t size; +}; + +struct overflow_queue *freeq; + +static inline int +oq_full(struct overflow_queue *q) +{ + return q->n >= q->size; +} + +static inline int +oq_empty(struct overflow_queue *q) +{ + return q->n <= 0; +} + +static inline void +oq_enq(struct overflow_queue *q, const struct netmap_slot *s) +{ + if (unlikely(oq_full(q))) { + D("%s: queue full!", q->name); + abort(); + } + q->slots[q->tail] = *s; + q->n++; + q->tail++; + if (q->tail >= q->size) + q->tail = 0; +} + +static inline struct netmap_slot +oq_deq(struct overflow_queue *q) +{ + struct netmap_slot s = q->slots[q->head]; + if (unlikely(oq_empty(q))) { + D("%s: queue empty!", q->name); + abort(); + } + q->n--; + q->head++; + if (q->head >= q->size) + q->head = 0; + return s; +} + +static volatile int do_abort = 0; + +uint64_t dropped = 0; +uint64_t forwarded = 0; +uint64_t received_bytes = 0; +uint64_t received_pkts = 0; +uint64_t non_ip = 0; +uint32_t freeq_n = 0; + +struct port_des { + char interface[MAX_PORTNAMELEN]; + struct my_ctrs ctr; + unsigned int last_sync; + uint32_t last_tail; + struct overflow_queue *oq; + struct nm_desc *nmd; + struct netmap_ring *ring; + struct group_des *group; +}; + +struct port_des *ports; + +/* each group of pipes receives all the packets */ +struct group_des { + char pipename[MAX_IFNAMELEN]; + struct port_des *ports; + int first_id; + int nports; + int last; + int custom_port; +}; + +struct group_des *groups; + +/* statistcs */ +struct counters { + struct timeval ts; + struct my_ctrs *ctrs; + uint64_t received_pkts; + uint64_t received_bytes; + uint64_t non_ip; + uint32_t freeq_n; + int status __attribute__((aligned(64))); +#define COUNTERS_EMPTY 0 +#define COUNTERS_FULL 1 +}; + +struct counters counters_buf; + +static void * +print_stats(void *arg) +{ + int npipes = glob_arg.output_rings; + int sys_int = 0; + (void)arg; + struct my_ctrs cur, prev; + struct my_ctrs *pipe_prev; + + pipe_prev = calloc(npipes, sizeof(struct my_ctrs)); + if (pipe_prev == NULL) { + D("out of memory"); + exit(1); + } + + char stat_msg[STAT_MSG_MAXSIZE] = ""; + + memset(&prev, 0, sizeof(prev)); + while (!do_abort) { + int j, dosyslog = 0, dostdout = 0, newdata; + uint64_t pps = 0, dps = 0, bps = 0, dbps = 0, usec = 0; + struct my_ctrs x; + + counters_buf.status = COUNTERS_EMPTY; + newdata = 0; + memset(&cur, 0, sizeof(cur)); + sleep(1); + if (counters_buf.status == COUNTERS_FULL) { + __sync_synchronize(); + newdata = 1; + cur.t = counters_buf.ts; + if (prev.t.tv_sec || prev.t.tv_usec) { + usec = (cur.t.tv_sec - prev.t.tv_sec) * 1000000 + + cur.t.tv_usec - prev.t.tv_usec; + } + } + + ++sys_int; + if (glob_arg.stdout_interval && sys_int % glob_arg.stdout_interval == 0) + dostdout = 1; + if (glob_arg.syslog_interval && sys_int % glob_arg.syslog_interval == 0) + dosyslog = 1; + + for (j = 0; j < npipes; ++j) { + struct my_ctrs *c = &counters_buf.ctrs[j]; + cur.pkts += c->pkts; + cur.drop += c->drop; + cur.drop_bytes += c->drop_bytes; + cur.bytes += c->bytes; + + if (usec) { + x.pkts = c->pkts - pipe_prev[j].pkts; + x.drop = c->drop - pipe_prev[j].drop; + x.bytes = c->bytes - pipe_prev[j].bytes; + x.drop_bytes = c->drop_bytes - pipe_prev[j].drop_bytes; + pps = (x.pkts*1000000 + usec/2) / usec; + dps = (x.drop*1000000 + usec/2) / usec; + bps = ((x.bytes*1000000 + usec/2) / usec) * 8; + dbps = ((x.drop_bytes*1000000 + usec/2) / usec) * 8; + } + pipe_prev[j] = *c; + + if ( (dosyslog || dostdout) && newdata ) + snprintf(stat_msg, STAT_MSG_MAXSIZE, + "{" + "\"ts\":%.6f," + "\"interface\":\"%s\"," + "\"output_ring\":%" PRIu16 "," + "\"packets_forwarded\":%" PRIu64 "," + "\"packets_dropped\":%" PRIu64 "," + "\"data_forward_rate_Mbps\":%.4f," + "\"data_drop_rate_Mbps\":%.4f," + "\"packet_forward_rate_kpps\":%.4f," + "\"packet_drop_rate_kpps\":%.4f," + "\"overflow_queue_size\":%" PRIu32 + "}", cur.t.tv_sec + (cur.t.tv_usec / 1000000.0), + ports[j].interface, + j, + c->pkts, + c->drop, + (double)bps / 1024 / 1024, + (double)dbps / 1024 / 1024, + (double)pps / 1000, + (double)dps / 1000, + c->oq_n); + + if (dosyslog && stat_msg[0]) + syslog(LOG_INFO, "%s", stat_msg); + if (dostdout && stat_msg[0]) + printf("%s\n", stat_msg); + } + if (usec) { + x.pkts = cur.pkts - prev.pkts; + x.drop = cur.drop - prev.drop; + x.bytes = cur.bytes - prev.bytes; + x.drop_bytes = cur.drop_bytes - prev.drop_bytes; + pps = (x.pkts*1000000 + usec/2) / usec; + dps = (x.drop*1000000 + usec/2) / usec; + bps = ((x.bytes*1000000 + usec/2) / usec) * 8; + dbps = ((x.drop_bytes*1000000 + usec/2) / usec) * 8; + } + + if ( (dosyslog || dostdout) && newdata ) + snprintf(stat_msg, STAT_MSG_MAXSIZE, + "{" + "\"ts\":%.6f," + "\"interface\":\"%s\"," + "\"output_ring\":null," + "\"packets_received\":%" PRIu64 "," + "\"packets_forwarded\":%" PRIu64 "," + "\"packets_dropped\":%" PRIu64 "," + "\"non_ip_packets\":%" PRIu64 "," + "\"data_forward_rate_Mbps\":%.4f," + "\"data_drop_rate_Mbps\":%.4f," + "\"packet_forward_rate_kpps\":%.4f," + "\"packet_drop_rate_kpps\":%.4f," + "\"free_buffer_slots\":%" PRIu32 + "}", cur.t.tv_sec + (cur.t.tv_usec / 1000000.0), + glob_arg.ifname, + received_pkts, + cur.pkts, + cur.drop, + counters_buf.non_ip, + (double)bps / 1024 / 1024, + (double)dbps / 1024 / 1024, + (double)pps / 1000, + (double)dps / 1000, + counters_buf.freeq_n); + + if (dosyslog && stat_msg[0]) + syslog(LOG_INFO, "%s", stat_msg); + if (dostdout && stat_msg[0]) + printf("%s\n", stat_msg); + + prev = cur; + } + + free(pipe_prev); + + return NULL; +} + +static void +free_buffers(void) +{ + int i, tot = 0; + struct port_des *rxport = &ports[glob_arg.output_rings]; + + /* build a netmap free list with the buffers in all the overflow queues */ + for (i = 0; i < glob_arg.output_rings + 1; i++) { + struct port_des *cp = &ports[i]; + struct overflow_queue *q = cp->oq; + + if (!q) + continue; + + while (q->n) { + struct netmap_slot s = oq_deq(q); + uint32_t *b = (uint32_t *)NETMAP_BUF(cp->ring, s.buf_idx); + + *b = rxport->nmd->nifp->ni_bufs_head; + rxport->nmd->nifp->ni_bufs_head = s.buf_idx; + tot++; + } + } + D("added %d buffers to netmap free list", tot); + + for (i = 0; i < glob_arg.output_rings + 1; ++i) { + nm_close(ports[i].nmd); + } +} + + +static void sigint_h(int sig) +{ + (void)sig; /* UNUSED */ + do_abort = 1; + signal(SIGINT, SIG_DFL); +} + +void usage() +{ + printf("usage: lb [options]\n"); + printf("where options are:\n"); + printf(" -h view help text\n"); + printf(" -i iface interface name (required)\n"); + printf(" -p [prefix:]npipes add a new group of output pipes\n"); + printf(" -B nbufs number of extra buffers (default: %d)\n", DEF_EXTRA_BUFS); + printf(" -b batch batch size (default: %d)\n", DEF_BATCH); + printf(" -w seconds wait for link up (default: %d)\n", DEF_WAIT_LINK); + printf(" -W enable busy waiting. this will run your CPU at 100%%\n"); + printf(" -s seconds seconds between syslog stats messages (default: 0)\n"); + printf(" -o seconds seconds between stdout stats messages (default: 0)\n"); + exit(0); +} + +static int +parse_pipes(char *spec) +{ + char *end = index(spec, ':'); + static int max_groups = 0; + struct group_des *g; + + ND("spec %s num_groups %d", spec, glob_arg.num_groups); + if (max_groups < glob_arg.num_groups + 1) { + size_t size = sizeof(*g) * (glob_arg.num_groups + 1); + groups = realloc(groups, size); + if (groups == NULL) { + D("out of memory"); + return 1; + } + } + g = &groups[glob_arg.num_groups]; + memset(g, 0, sizeof(*g)); + + if (end != NULL) { + if (end - spec > MAX_IFNAMELEN - 8) { + D("name '%s' too long", spec); + return 1; + } + if (end == spec) { + D("missing prefix before ':' in '%s'", spec); + return 1; + } + strncpy(g->pipename, spec, end - spec); + g->custom_port = 1; + end++; + } else { + /* no prefix, this group will use the + * name of the input port. + * This will be set in init_groups(), + * since here the input port may still + * be uninitialized + */ + end = spec; + } + if (*end == '\0') { + g->nports = DEF_OUT_PIPES; + } else { + g->nports = atoi(end); + if (g->nports < 1) { + D("invalid number of pipes '%s' (must be at least 1)", end); + return 1; + } + } + glob_arg.output_rings += g->nports; + glob_arg.num_groups++; + return 0; +} + +/* complete the initialization of the groups data structure */ +void init_groups(void) +{ + int i, j, t = 0; + struct group_des *g = NULL; + for (i = 0; i < glob_arg.num_groups; i++) { + g = &groups[i]; + g->ports = &ports[t]; + for (j = 0; j < g->nports; j++) + g->ports[j].group = g; + t += g->nports; + if (!g->custom_port) + strcpy(g->pipename, glob_arg.base_name); + for (j = 0; j < i; j++) { + struct group_des *h = &groups[j]; + if (!strcmp(h->pipename, g->pipename)) + g->first_id += h->nports; + } + } + g->last = 1; +} + +/* push the packet described by slot rs to the group g. + * This may cause other buffers to be pushed down the + * chain headed by g. + * Return a free buffer. + */ +uint32_t forward_packet(struct group_des *g, struct netmap_slot *rs) +{ + uint32_t hash = rs->ptr; + uint32_t output_port = hash % g->nports; + struct port_des *port = &g->ports[output_port]; + struct netmap_ring *ring = port->ring; + struct overflow_queue *q = port->oq; + + /* Move the packet to the output pipe, unless there is + * either no space left on the ring, or there is some + * packet still in the overflow queue (since those must + * take precedence over the new one) + */ + if (ring->head != ring->tail && (q == NULL || oq_empty(q))) { + struct netmap_slot *ts = &ring->slot[ring->head]; + struct netmap_slot old_slot = *ts; + + ts->buf_idx = rs->buf_idx; + ts->len = rs->len; + ts->flags |= NS_BUF_CHANGED; + ts->ptr = rs->ptr; + ring->head = nm_ring_next(ring, ring->head); + port->ctr.bytes += rs->len; + port->ctr.pkts++; + forwarded++; + return old_slot.buf_idx; + } + + /* use the overflow queue, if available */ + if (q == NULL || oq_full(q)) { + /* no space left on the ring and no overflow queue + * available: we are forced to drop the packet + */ + dropped++; + port->ctr.drop++; + port->ctr.drop_bytes += rs->len; + return rs->buf_idx; + } + + oq_enq(q, rs); + + /* + * we cannot continue down the chain and we need to + * return a free buffer now. We take it from the free queue. + */ + if (oq_empty(freeq)) { + /* the free queue is empty. Revoke some buffers + * from the longest overflow queue + */ + uint32_t j; + struct port_des *lp = &ports[0]; + uint32_t max = lp->oq->n; + + /* let lp point to the port with the longest queue */ + for (j = 1; j < glob_arg.output_rings; j++) { + struct port_des *cp = &ports[j]; + if (cp->oq->n > max) { + lp = cp; + max = cp->oq->n; + } + } + + /* move the oldest BUF_REVOKE buffers from the + * lp queue to the free queue + */ + // XXX optimize this cycle + for (j = 0; lp->oq->n && j < BUF_REVOKE; j++) { + struct netmap_slot tmp = oq_deq(lp->oq); + + dropped++; + lp->ctr.drop++; + lp->ctr.drop_bytes += tmp.len; + + oq_enq(freeq, &tmp); + } + + ND(1, "revoked %d buffers from %s", j, lq->name); + } + + return oq_deq(freeq).buf_idx; +} + +int main(int argc, char **argv) +{ + int ch; + uint32_t i; + int rv; + unsigned int iter = 0; + int poll_timeout = 10; /* default */ + + glob_arg.ifname[0] = '\0'; + glob_arg.output_rings = 0; + glob_arg.batch = DEF_BATCH; + glob_arg.wait_link = DEF_WAIT_LINK; + glob_arg.busy_wait = false; + glob_arg.syslog_interval = 0; + glob_arg.stdout_interval = 0; + + while ( (ch = getopt(argc, argv, "hi:p:b:B:s:o:w:W")) != -1) { + switch (ch) { + case 'i': + D("interface is %s", optarg); + if (strlen(optarg) > MAX_IFNAMELEN - 8) { + D("ifname too long %s", optarg); + return 1; + } + if (strncmp(optarg, "netmap:", 7) && strncmp(optarg, "vale", 4)) { + sprintf(glob_arg.ifname, "netmap:%s", optarg); + } else { + strcpy(glob_arg.ifname, optarg); + } + break; + + case 'p': + if (parse_pipes(optarg)) { + usage(); + return 1; + } + break; + + case 'B': + glob_arg.extra_bufs = atoi(optarg); + D("requested %d extra buffers", glob_arg.extra_bufs); + break; + + case 'b': + glob_arg.batch = atoi(optarg); + D("batch is %d", glob_arg.batch); + break; + + case 'w': + glob_arg.wait_link = atoi(optarg); + D("link wait for up time is %d", glob_arg.wait_link); + break; + + case 'W': + glob_arg.busy_wait = true; + break; + + case 'o': + glob_arg.stdout_interval = atoi(optarg); + break; + + case 's': + glob_arg.syslog_interval = atoi(optarg); + break; + + case 'h': + usage(); + return 0; + break; + + default: + D("bad option %c %s", ch, optarg); + usage(); + return 1; + } + } + + if (glob_arg.ifname[0] == '\0') { + D("missing interface name"); + usage(); + return 1; + } + + /* extract the base name */ + char *nscan = strncmp(glob_arg.ifname, "netmap:", 7) ? + glob_arg.ifname : glob_arg.ifname + 7; + strncpy(glob_arg.base_name, nscan, MAX_IFNAMELEN-1); + for (nscan = glob_arg.base_name; *nscan && !index("-*^{}/@", *nscan); nscan++) + ; + *nscan = '\0'; + + if (glob_arg.num_groups == 0) + parse_pipes(""); + + if (glob_arg.syslog_interval) { + setlogmask(LOG_UPTO(LOG_INFO)); + openlog("lb", LOG_CONS | LOG_PID | LOG_NDELAY, LOG_LOCAL1); + } + + uint32_t npipes = glob_arg.output_rings; + + + pthread_t stat_thread; + + ports = calloc(npipes + 1, sizeof(struct port_des)); + if (!ports) { + D("failed to allocate the stats array"); + return 1; + } + struct port_des *rxport = &ports[npipes]; + init_groups(); + + memset(&counters_buf, 0, sizeof(counters_buf)); + counters_buf.ctrs = calloc(npipes, sizeof(struct my_ctrs)); + if (!counters_buf.ctrs) { + D("failed to allocate the counters snapshot buffer"); + return 1; + } + + /* we need base_req to specify pipes and extra bufs */ + struct nmreq base_req; + memset(&base_req, 0, sizeof(base_req)); + + base_req.nr_arg1 = npipes; + base_req.nr_arg3 = glob_arg.extra_bufs; + + rxport->nmd = nm_open(glob_arg.ifname, &base_req, 0, NULL); + + if (rxport->nmd == NULL) { + D("cannot open %s", glob_arg.ifname); + return (1); + } else { + D("successfully opened %s (tx rings: %u)", glob_arg.ifname, + rxport->nmd->req.nr_tx_slots); + } + + uint32_t extra_bufs = rxport->nmd->req.nr_arg3; + struct overflow_queue *oq = NULL; + /* reference ring to access the buffers */ + rxport->ring = NETMAP_RXRING(rxport->nmd->nifp, 0); + + if (!glob_arg.extra_bufs) + goto run; + + D("obtained %d extra buffers", extra_bufs); + if (!extra_bufs) + goto run; + + /* one overflow queue for each output pipe, plus one for the + * free extra buffers + */ *** DIFF OUTPUT TRUNCATED AT 1000 LINES ***
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