using netmap

[Andreas Nilsson]

On Mon, Apr 15, 2013 at 7:52 PM, Sami Halabi <sodynet1 at gmail.com> wrote:

> Hi,
> I would like to start using netmap.
>
> as a start i copied the example from netmap
> <http://info.iet.unipi.it/~luigi/netmap/>page:
> #include <stdio.h>
> #include <stdlib.h>
> #include <net/netmap_user.h>
> #include <net/netmap.h>
>
> int main() {
>
> struct netmap_if *nifp;
> struct nmreq req;
> int i, len;
> char *buf;
> FILE* fd;
>
> fd = open("/dev/netmap", 0);
> strcpy(req.nr_name, "em1"); // register the interface
> ioctl(fd, NIOCREG, &req); // offset of the structure
> mem = mmap(NULL, req.nr_memsize, PROT_READ|PROT_WRITE, 0, fd, 0);
> nifp = NETMAP_IF(mem, req.nr_offset);
> for (;;) {
>         struct pollfd x[1];
>         struct netmap_ring *ring = NETMAP_RX_RING(nifp, 0);
>
>         x[0].fd = fd;
>         x[0].events = POLLIN;
>         poll(x, 1, 1000);
>         for ( ; ring->avail > 0 ; ring->avail--) {
>                 i = ring->cur;
>                 buf = NETMAP_BUF(ring, i);
>                 use_data(buf, ring->slot[i].len);
>                 ring->cur = NETMAP_NEXT(ring, i);
>         }
> }
>
> return 0;
> }
>
>
> and tried to compile:
> root at fbsd1:~/netmap # gcc -O2 -pipe -Werror -Wall -I ../sys -Wextra -c n.c
> In file included from n.c:4:
> /usr/include/net/netmap.h:139: error: expected specifier-qualifier-list
> before 'uint32_t'
> /usr/include/net/netmap.h:228: error: expected ':', ',', ';', '}' or
> '__attribute__' before 'num_slots'
> /usr/include/net/netmap.h:255: error: 'IFNAMSIZ' undeclared here (not in a
> function)
> /usr/include/net/netmap.h:256: error: expected ':', ',', ';', '}' or
> '__attribute__' before 'ni_version'
> /usr/include/net/netmap.h:292: error: expected specifier-qualifier-list
> before 'uint32_t'
> cc1: warnings being treated as errors
> n.c: In function 'main':
> n.c:14: warning: implicit declaration of function 'open'
> n.c:14: warning: assignment makes pointer from integer without a cast
> n.c:15: warning: implicit declaration of function 'strcpy'
> n.c:15: warning: incompatible implicit declaration of built-in function
> 'strcpy'
> n.c:16: warning: implicit declaration of function 'ioctl'
> n.c:16: error: 'NIOCREG' undeclared (first use in this function)
> n.c:16: error: (Each undeclared identifier is reported only once
> n.c:16: error: for each function it appears in.)
> n.c:17: error: 'mem' undeclared (first use in this function)
> n.c:17: error: 'struct nmreq' has no member named 'nr_memsize'
> n.c:17: error: 'PROT_READ' undeclared (first use in this function)
> n.c:17: error: 'PROT_WRITE' undeclared (first use in this function)
> n.c:17: warning: passing argument 5 of 'mmap' makes integer from pointer
> without a cast
> n.c:18: error: 'struct nmreq' has no member named 'nr_offset'
> n.c:20: error: array type has incomplete element type
> n.c:21: warning: implicit declaration of function 'NETMAP_RX_RING'
> n.c:21: warning: initialization makes pointer from integer without a cast
> n.c:24: error: 'POLLIN' undeclared (first use in this function)
> n.c:25: warning: implicit declaration of function 'poll'
> n.c:26: error: 'struct netmap_ring' has no member named 'avail'
> n.c:26: error: 'struct netmap_ring' has no member named 'avail'
> n.c:27: error: 'struct netmap_ring' has no member named 'cur'
> n.c:28: error: 'struct netmap_ring' has no member named 'nr_buf_size'
> n.c:29: warning: implicit declaration of function 'use_data'
> n.c:29: error: 'struct netmap_ring' has no member named 'slot'
> n.c:30: error: 'struct netmap_ring' has no member named 'cur'
> n.c:30: warning: implicit declaration of function 'NETMAP_NEXT'
> n.c:20: warning: unused variable 'x'
> n.c:10: warning: unused variable 'len'
> root at fbsd1:~/netmap #
>
>
> can you help me figure it out?
>
> Thanks in advance,
>
> --
> Sami Halabi
> Information Systems Engineer
> NMS Projects Expert
> FreeBSD SysAdmin Expert
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>

Hello Sami,

First, I'm by no means an expert on NETMAP, but the url you provided says
that it's a snapshot, not a ready progam. There are a few fully working
examples in tools/tools/netmap/ subdir of at least 9-STABLE and 10-CURRENT.
Maybe you can find an example to start with there instead?

Quite a few of the errors are from regular syscalls, and each of them have
a manpage that says which files to include, and compiling stuff with
-Werror assumes you can deal with "picky" compilers.

Hope you come up with a working example.

Best regards
Andreas