diff options
| author | Doug Ledford <dledford@redhat.com> | 2012-10-14 17:03:03 +0000 |
|---|---|---|
| committer | Roland Dreier <roland@purestorage.com> | 2013-05-06 11:55:24 -0700 |
| commit | 869a5576e32afc5dd87e53fd899af88c1e4ce928 (patch) | |
| tree | 69afa467ad92c793c0929c68d3a1f39d870b38cf | |
| parent | 71b66e91e7952c5132f639786c94848d66eda7e9 (diff) | |
| download | libibverbs-869a5576e32afc5dd87e53fd899af88c1e4ce928.tar.gz | |
ud_pingpong: Don't try to send UD messages larger than MTU
The UD protocol doesn't support message sizes larger than the path
MTU. We don't go so far as to check path MTU, but we do check port
MTU. This prevents failed runs of the pingpong_ud program with large
MTUs.
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
| -rw-r--r-- | examples/ud_pingpong.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/examples/ud_pingpong.c b/examples/ud_pingpong.c index c279ddb..21c551d 100644 --- a/examples/ud_pingpong.c +++ b/examples/ud_pingpong.c @@ -324,6 +324,21 @@ static struct pingpong_context *pp_init_ctx(struct ibv_device *ib_dev, int size, goto clean_buffer; } + { + struct ibv_port_attr port_info = { 0 }; + int mtu; + + if (ibv_query_port(ctx->context, port, &port_info)) { + fprintf(stderr, "Unable to query port info for port %d\n", port); + goto clean_device; + } + mtu = 1 << (port_info.active_mtu + 7); + if (size > mtu) { + fprintf(stderr, "Requested size larger than port MTU (%d)\n", mtu); + goto clean_device; + } + } + if (use_event) { ctx->channel = ibv_create_comp_channel(ctx->context); if (!ctx->channel) { |