RDMA transport maps user tos to underline virtual lanes(VL)
for IB or DSCP values. RDMA CM transport abstract thats for
RDS. TCP transport makes use of default priority 0 and maps
all user tos values to it.
Reviewed-by: Sowmini Varadhan <sowmini.varad...@oracle.com>
Signed-off-by: Santosh Shilimkar <santosh.shilim...@oracle.com>
[yanjun....@oracle.com: Adapted original patch with ipv6 changes]
Signed-off-by: Zhu Yanjun <yanjun....@oracle.com>
---
net/rds/af_rds.c | 10 ++++++----
net/rds/ib.c | 10 ++++++++++
net/rds/rds.h | 1 +
net/rds/tcp.c | 7 +++++++
4 files changed, 24 insertions(+), 4 deletions(-)
diff --git a/net/rds/af_rds.c b/net/rds/af_rds.c
index 9045158..d6cc97f 100644
--- a/net/rds/af_rds.c
+++ b/net/rds/af_rds.c
@@ -255,16 +255,18 @@ static __poll_t rds_poll(struct file *file, struct socket
*sock,
static int rds_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
struct rds_sock *rs = rds_sk_to_rs(sock->sk);
- rds_tos_t tos;
+ rds_tos_t utos, tos = 0;
switch (cmd) {
case SIOCRDSSETTOS:
- if (get_user(tos, (rds_tos_t __user *)arg))
+ if (get_user(utos, (rds_tos_t __user *)arg))
return -EFAULT;
if (rs->rs_transport &&
- rs->rs_transport->t_type == RDS_TRANS_TCP)
- tos = 0;
+ rs->rs_transport->get_tos_map)
+ tos = rs->rs_transport->get_tos_map(utos);
+ else
+ return -ENOIOCTLCMD;
spin_lock_bh(&rds_sock_lock);
if (rs->rs_tos || rs->rs_conn) {
diff --git a/net/rds/ib.c b/net/rds/ib.c
index 21b6588..2da9b75 100644
--- a/net/rds/ib.c
+++ b/net/rds/ib.c
@@ -515,6 +515,15 @@ void rds_ib_exit(void)
rds_ib_mr_exit();
}
+static u8 rds_ib_get_tos_map(u8 tos)
+{
+ /* 1:1 user to transport map for RDMA transport.
+ * In future, if custom map is desired, hook can export
+ * user configurable map.
+ */
+ return tos;
+}
+
struct rds_transport rds_ib_transport = {
.laddr_check = rds_ib_laddr_check,
.xmit_path_complete = rds_ib_xmit_path_complete,
@@ -537,6 +546,7 @@ struct rds_transport rds_ib_transport = {
.sync_mr = rds_ib_sync_mr,
.free_mr = rds_ib_free_mr,
.flush_mrs = rds_ib_flush_mrs,
+ .get_tos_map = rds_ib_get_tos_map,
.t_owner = THIS_MODULE,
.t_name = "infiniband",
.t_unloading = rds_ib_is_unloading,
diff --git a/net/rds/rds.h b/net/rds/rds.h
index 7e52b92..0d8f67c 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -574,6 +574,7 @@ struct rds_transport {
void (*free_mr)(void *trans_private, int invalidate);
void (*flush_mrs)(void);
bool (*t_unloading)(struct rds_connection *conn);
+ u8 (*get_tos_map)(u8 tos);
};
/* Bind hash table key length. It is the sum of the size of a struct
diff --git a/net/rds/tcp.c b/net/rds/tcp.c
index eb68519..fd26941 100644
--- a/net/rds/tcp.c
+++ b/net/rds/tcp.c
@@ -453,6 +453,12 @@ static void rds_tcp_destroy_conns(void)
static void rds_tcp_exit(void);
+static u8 rds_tcp_get_tos_map(u8 tos)
+{
+ /* all user tos mapped to default 0 for TCP transport */
+ return 0;
+}
+
struct rds_transport rds_tcp_transport = {
.laddr_check = rds_tcp_laddr_check,
.xmit_path_prepare = rds_tcp_xmit_path_prepare,
@@ -467,6 +473,7 @@ struct rds_transport rds_tcp_transport = {
.inc_free = rds_tcp_inc_free,
.stats_info_copy = rds_tcp_stats_info_copy,
.exit = rds_tcp_exit,
+ .get_tos_map = rds_tcp_get_tos_map,
.t_owner = THIS_MODULE,
.t_name = "tcp",
.t_type = RDS_TRANS_TCP,
--
1.9.1
