Hi ,
Thanks Ben and Daniel for looking into this.
Both the issues which I was facing is resolved now.
steps that i took was :
I added "shm_unlink" after "shm_open call".
For the rx issue which I was getting , as suggested by Ben i used gdb to
debug into the libmemif.
and I realised a "memif_refill_queue" call is required on slave before
master can transmit data, calling memif_refill_queue() on slave provides
buffers for master.
Are you able to run with shm_open without using shm_unlink ?
If you could please post what was your observation.
Thank You
Pragya Nand
On Wed, May 25, 2022 at 1:16 PM Daniel Béreš via lists.fd.io <dberes=
cisco....@lists.fd.io> wrote:
> Hi,
>
> To sync up, can you run loopback example?
>
> I tried to reproduce your problem on 3.10.0-229.1.2.rt56.141.2.el7_1.x86_64
> but I got different result.
>
> diff --git a/extras/libmemif/src/CMakeLists.txt
> b/extras/libmemif/src/CMakeLists.txt
> index ddb8a52..a11a65f 100644
> --- a/extras/libmemif/src/CMakeLists.txt
> +++ b/extras/libmemif/src/CMakeLists.txt
> @@ -41,6 +41,12 @@ if(LIB_BSD)
> target_link_libraries(memif ${LIB_BSD})
> endif()
>
> +find_library(LIB_LRT rt)
> +if(LIB_BSD)
> + add_compile_definitions(HAS_LIB_LRT)
> + target_link_libraries(memif ${LIB_LRT})
> +endif()
> +
> foreach(file ${MEMIF_HEADERS})
> get_filename_component(dir ${file} DIRECTORY)
> install(
> diff --git a/extras/libmemif/src/main.c b/extras/libmemif/src/main.c
> index 21b3994..132ce8d 100644
> --- a/extras/libmemif/src/main.c
> +++ b/extras/libmemif/src/main.c
> @@ -184,6 +184,7 @@ memif_get_version_str ()
>
> #define DBG_TX_BUF (0)
> #define DBG_RX_BUF (1)
> +#define MEMIF_DBG_SHM 1
>
> #ifdef MEMIF_DBG_SHM
> static void
> @@ -1234,13 +1235,17 @@ memif_add_region (memif_connection_t *conn, uint8_t
> has_buffers)
> r->region_size = (has_buffers == 0) ? r->buffer_offset : r->buffer_offset +
> conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
> (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
> -
> +/*
> if ((r->fd = memfd_create ("memif region 0", MFD_ALLOW_SEALING)) == -1)
> return memif_syscall_error_handler (errno);
> +*/
> + if ((r->fd = shm_open ("memif region 0", O_RDWR | O_CREAT, S_IRWXU)) == -1)
> + return memif_syscall_error_handler (errno);
>
> +/*
> if ((fcntl (r->fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
> return memif_syscall_error_handler (errno);
> -
> +*/
> if ((ftruncate (r->fd, r->region_size)) == -1)
> return memif_syscall_error_handler (errno);
>
>
>
>
>
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