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Message-ID: <CA+mtBx_MtQGqNT6iungW7eyStpvLEGYsgXQ8=mYq_JR8jw3=DQ@mail.gmail.com>
Date: Tue, 5 Jul 2011 17:46:36 -0700
From: Tom Herbert <therbert@...gle.com>
To: David Miller <davem@...emloft.net>
Cc: victor@...iniac.net, netdev@...r.kernel.org,
Willem Bruijn <willemb@...gle.com>
Subject: Re: [PATCH 0/2] AF_PACKET fanout support
Dave,
Thanks for these patches! Is it possible you could use an alternative
term than "fanout"? I think this may be more often associated with a
transmit operation (e.g. multicast fanout).
Also, another useful mode of steering would be to steer packets to a
socket which was recently processed by a thread running on the same
CPU; somewhat analogous to RFS (cc'ed WIllem Bruijn who is already
working on this I believe).
Tom
On Mon, Jul 4, 2011 at 9:20 PM, David Miller <davem@...emloft.net> wrote:
>
> This is a fully functional version, I've tested both hash and
> load-balance modes successfully. I plan to commit this to
> net-next-2.6 very soon.
>
> Below is a test program that other people can play with
> if they want. It basically creates 4 threads, and creates
> an AF_PACKET fanout amongst them. Each thread prints out
> it's pid in parentheses every time it receives 10 packets.
> After each thread processes 10,000 packets, it exits.
>
> Try things like "./test eth0 hash", "./test eth0 lb", etc.
>
> Signed-off-by: David S. Miller <davem@...emloft.net>
>
> --------------------
> #include <stddef.h>
> #include <stdlib.h>
> #include <stdio.h>
> #include <string.h>
>
> #include <sys/types.h>
> #include <sys/wait.h>
> #include <sys/socket.h>
> #include <sys/ioctl.h>
>
> #include <unistd.h>
>
> #include <linux/if_ether.h>
> #include <linux/if_packet.h>
>
> #include <net/if.h>
>
> static const char *device_name;
> static int fanout_type;
> static int fanout_id;
>
> #ifndef PACKET_FANOUT
> #define PACKET_FANOUT 18
> #define PACKET_FANOUT_HASH 0
> #define PACKET_FANOUT_LB 1
> #endif
>
> static int setup_socket(void)
> {
> int err, fd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_IP));
> struct sockaddr_ll ll;
> struct ifreq ifr;
> int fanout_arg;
>
> if (fd < 0) {
> perror("socket");
> return EXIT_FAILURE;
> }
>
> memset(&ifr, 0, sizeof(ifr));
> strcpy(ifr.ifr_name, device_name);
> err = ioctl(fd, SIOCGIFINDEX, &ifr);
> if (err < 0) {
> perror("SIOCGIFINDEX");
> return EXIT_FAILURE;
> }
>
> memset(&ll, 0, sizeof(ll));
> ll.sll_family = AF_PACKET;
> ll.sll_ifindex = ifr.ifr_ifindex;
> err = bind(fd, (struct sockaddr *) &ll, sizeof(ll));
> if (err < 0) {
> perror("bind");
> return EXIT_FAILURE;
> }
>
> fanout_arg = (fanout_id | (fanout_type << 16));
> err = setsockopt(fd, SOL_PACKET, PACKET_FANOUT,
> &fanout_arg, sizeof(fanout_arg));
> if (err) {
> perror("setsockopt");
> return EXIT_FAILURE;
> }
>
> return fd;
> }
>
> static void fanout_thread(void)
> {
> int fd = setup_socket();
> int limit = 10000;
>
> if (fd < 0)
> exit(fd);
>
> while (limit-- > 0) {
> char buf[1600];
> int err;
>
> err = read(fd, buf, sizeof(buf));
> if (err < 0) {
> perror("read");
> exit(EXIT_FAILURE);
> }
> if ((limit % 10) == 0)
> fprintf(stdout, "(%d) \n", getpid());
> }
>
> fprintf(stdout, "%d: Received 10000 packets\n", getpid());
>
> close(fd);
> exit(0);
> }
>
> int main(int argc, char **argp)
> {
> int fd, err;
> int i;
>
> if (argc != 3) {
> fprintf(stderr, "Usage: %s INTERFACE {hash|lb}\n", argp[0]);
> return EXIT_FAILURE;
> }
>
> if (!strcmp(argp[2], "hash"))
> fanout_type = PACKET_FANOUT_HASH;
> else if (!strcmp(argp[2], "lb"))
> fanout_type = PACKET_FANOUT_LB;
> else {
> fprintf(stderr, "Unknown fanout type [%s]\n", argp[2]);
> exit(EXIT_FAILURE);
> }
>
> device_name = argp[1];
> fanout_id = getpid() & 0xffff;
>
> for (i = 0; i < 4; i++) {
> pid_t pid = fork();
>
> switch (pid) {
> case 0:
> fanout_thread();
>
> case -1:
> perror("fork");
> exit(EXIT_FAILURE);
> }
> }
>
> for (i = 0; i < 4; i++) {
> int status;
>
> wait(&status);
> }
>
> return 0;
> }
> --
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