Re: [net-next PATCH] net/rds: Return proper "tos" value to user-space

[Yanjun Zhu]

On 2019/3/8 6:01, Gerd Rausch wrote:
The proper "tos" value needs to be returned
to user-space (sockopt RDS_INFO_CONNECTIONS).

Fixes: 3eb450367d08 ("rds: add type of service(tos) infrastructure")
Signed-off-by: Gerd Rausch <gerd.rau...@oracle.com>

In RDS/IB, tos is set in this function. Do you still use RoCE device?

static int rds_ib_conn_info_visitor(struct rds_connection *conn,

                                    void *buffer)
{
        struct rds_info_rdma_connection *iinfo = buffer;
        struct rds_ib_connection *ic;

        /* We will only ever look at IB transports */
        if (conn->c_trans != &rds_ib_transport)
                return 0;
        if (conn->c_isv6)
                return 0;

        iinfo->src_addr = conn->c_laddr.s6_addr32[3];
        iinfo->dst_addr = conn->c_faddr.s6_addr32[3];
        iinfo->tos = conn->c_tos;

        memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
        memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
        if (rds_conn_state(conn) == RDS_CONN_UP) {
                struct rds_ib_device *rds_ibdev;

                ic = conn->c_transport_data;

                rdma_read_gids(ic->i_cm_id, (union ib_gid 
*)&iinfo->src_gid,
                               (union ib_gid *)&iinfo->dst_gid);

                rds_ibdev = ic->rds_ibdev;
                iinfo->max_send_wr = ic->i_send_ring.w_nr;
                iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
                iinfo->max_send_sge = rds_ibdev->max_sge;
                rds_ib_get_mr_info(rds_ibdev, iinfo);
        }
        return 1;

}

run rds-info, you can find tos with the above function.
---
  net/rds/connection.c | 1 +
  1 file changed, 1 insertion(+)

diff --git a/net/rds/connection.c b/net/rds/connection.c
index 7ea134f9a825..ed7f2133acc2 100644
--- a/net/rds/connection.c
+++ b/net/rds/connection.c
@@ -736,6 +736,7 @@ static int rds_conn_info_visitor(struct rds_conn_path *cp, 
void *buffer)
        cinfo->next_rx_seq = cp->cp_next_rx_seq;
        cinfo->laddr = conn->c_laddr.s6_addr32[3];
        cinfo->faddr = conn->c_faddr.s6_addr32[3];
+       cinfo->tos = conn->c_tos;

Without this commit, what will happen?

Zhu Yanjun

        strncpy(cinfo->transport, conn->c_trans->t_name,
                sizeof(cinfo->transport));
        cinfo->flags = 0;