RDS: Add TCP transport to RDS

This code allows RDS to be tunneled over a TCP connection.

RDMA operations are disabled when using TCP transport,
but this frees RDS from the IB/RDMA stack dependency, and allows
it to be used with standard Ethernet adapters, or in a VM.

Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/rds.h b/include/linux/rds.h
index d91dc91f5443..89d46e1afbb1 100644
--- a/include/linux/rds.h
+++ b/include/linux/rds.h
@@ -147,6 +147,18 @@ struct rds_info_socket {
         u_int64_t       inum;
 } __attribute__((packed));
 
+struct rds_info_tcp_socket {
+        __be32          local_addr;
+        __be16          local_port;
+        __be32          peer_addr;
+        __be16          peer_port;
+        u_int64_t       hdr_rem;
+        u_int64_t       data_rem;
+        u_int32_t       last_sent_nxt;
+        u_int32_t       last_expected_una;
+        u_int32_t       last_seen_una;
+} __attribute__((packed));
+
 #define RDS_IB_GID_LEN  16
 struct rds_info_rdma_connection {
         __be32          src_addr;