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, 12 insertions, 10 deletions

diff --git a/hw/rdma/rdma_backend.h b/hw/rdma/rdma_backend.h
index fc83330..59ad2b8 100644
--- a/hw/rdma/rdma_backend.h
+++ b/hw/rdma/rdma_backend.h
@@ -28,11 +28,6 @@ enum ibv_special_qp_type {
     IBV_QPT_GSI = 1,
 };
 
-static inline union ibv_gid *rdma_backend_gid(RdmaBackendDev *dev)
-{
-    return &dev->gid;
-}
-
 static inline uint32_t rdma_backend_qpn(const RdmaBackendQP *qp)
 {
     return qp->ibqp ? qp->ibqp->qp_num : 1;
@@ -51,9 +46,15 @@ static inline uint32_t rdma_backend_mr_rkey(const RdmaBackendMR *mr)
 int rdma_backend_init(RdmaBackendDev *backend_dev, PCIDevice *pdev,
                       RdmaDeviceResources *rdma_dev_res,
                       const char *backend_device_name, uint8_t port_num,
-                      uint8_t backend_gid_idx, struct ibv_device_attr *dev_attr,
-                      CharBackend *mad_chr_be, Error **errp);
+                      struct ibv_device_attr *dev_attr, CharBackend *mad_chr_be,
+                      Error **errp);
 void rdma_backend_fini(RdmaBackendDev *backend_dev);
+int rdma_backend_add_gid(RdmaBackendDev *backend_dev, const char *ifname,
+                         union ibv_gid *gid);
+int rdma_backend_del_gid(RdmaBackendDev *backend_dev, const char *ifname,
+                         union ibv_gid *gid);
+int rdma_backend_get_gid_index(RdmaBackendDev *backend_dev,
+                               union ibv_gid *gid);
 void rdma_backend_start(RdmaBackendDev *backend_dev);
 void rdma_backend_stop(RdmaBackendDev *backend_dev);
 void rdma_backend_register_comp_handler(void (*handler)(int status,
@@ -82,9 +83,9 @@ int rdma_backend_create_qp(RdmaBackendQP *qp, uint8_t qp_type,
 int rdma_backend_qp_state_init(RdmaBackendDev *backend_dev, RdmaBackendQP *qp,
                                uint8_t qp_type, uint32_t qkey);
 int rdma_backend_qp_state_rtr(RdmaBackendDev *backend_dev, RdmaBackendQP *qp,
-                              uint8_t qp_type, union ibv_gid *dgid,
-                              uint32_t dqpn, uint32_t rq_psn, uint32_t qkey,
-                              bool use_qkey);
+                              uint8_t qp_type, uint8_t sgid_idx,
+                              union ibv_gid *dgid, uint32_t dqpn,
+                              uint32_t rq_psn, uint32_t qkey, bool use_qkey);
 int rdma_backend_qp_state_rts(RdmaBackendQP *qp, uint8_t qp_type,
                               uint32_t sq_psn, uint32_t qkey, bool use_qkey);
 int rdma_backend_query_qp(RdmaBackendQP *qp, struct ibv_qp_attr *attr,
@@ -94,6 +95,7 @@ void rdma_backend_destroy_qp(RdmaBackendQP *qp);
 void rdma_backend_post_send(RdmaBackendDev *backend_dev,
                             RdmaBackendQP *qp, uint8_t qp_type,
                             struct ibv_sge *sge, uint32_t num_sge,
+                            uint8_t sgid_idx, union ibv_gid *sgid,
                             union ibv_gid *dgid, uint32_t dqpn, uint32_t dqkey,
                             void *ctx);
 void rdma_backend_post_recv(RdmaBackendDev *backend_dev,