hw/pvrdma: Add support to allow guest to configure GID table

The control over the RDMA device's GID table is done by updating the
device's Ethernet function addresses.
Usually the first GID entry is determined by the MAC address, the second
by the first IPv6 address and the third by the IPv4 address. Other
entries can be added by adding more IP addresses. The opposite is the
same, i.e. whenever an address is removed, the corresponding GID entry
is removed.

The process is done by the network and RDMA stacks. Whenever an address
is added the ib_core driver is notified and calls the device driver
add_gid function which in turn update the device.

To support this in pvrdma device we need to hook into the create_bind
and destroy_bind HW commands triggered by pvrdma driver in guest.
Whenever a change is made to the pvrdma port's GID table a special QMP
message is sent to be processed by libvirt to update the address of the
backend Ethernet device.

Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
Reviewed-by: Marcel Apfelbaum<marcel.apfelbaum@gmail.com>
Signed-off-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/hw/rdma/rdma_rm_defs.h b/hw/rdma/rdma_rm_defs.h
index 9b399063d3..7b3435f991 100644
--- a/hw/rdma/rdma_rm_defs.h
+++ b/hw/rdma/rdma_rm_defs.h
@@ -19,7 +19,7 @@
 #include "rdma_backend_defs.h"
 
 #define MAX_PORTS             1
-#define MAX_PORT_GIDS         1
+#define MAX_PORT_GIDS         255
 #define MAX_GIDS              MAX_PORT_GIDS
 #define MAX_PORT_PKEYS        1
 #define MAX_PKEYS             MAX_PORT_PKEYS
@@ -86,8 +86,13 @@ typedef struct RdmaRmQP {
     enum ibv_qp_state qp_state;
 } RdmaRmQP;
 
+typedef struct RdmaRmGid {
+    union ibv_gid gid;
+    int backend_gid_index;
+} RdmaRmGid;
+
 typedef struct RdmaRmPort {
-    union ibv_gid gid_tbl[MAX_PORT_GIDS];
+    RdmaRmGid gid_tbl[MAX_PORT_GIDS];
     enum ibv_port_state state;
 } RdmaRmPort;