IB/ehca: Implement modify_port

Add "Modify Port" verb support to eHCA driver.  The IB communication
manager needs this to set the IsCM port capability bit when
initializing.

Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

5 files changed, 83 insertions, 2 deletions

diff --git a/drivers/infiniband/hw/ehca/ehca_classes.h b/drivers/infiniband/hw/ehca/ehca_classes.h
index 82ded44c6cee..10fb8fbafa0c 100644
--- a/drivers/infiniband/hw/ehca/ehca_classes.h
+++ b/drivers/infiniband/hw/ehca/ehca_classes.h
@@ -106,6 +106,7 @@ struct ehca_shca {
         struct ehca_mr *maxmr;
         struct ehca_pd *pd;
         struct h_galpas galpas;
+        struct mutex modify_mutex;
 };
 
 struct ehca_pd {
diff --git a/drivers/infiniband/hw/ehca/ehca_hca.c b/drivers/infiniband/hw/ehca/ehca_hca.c
index 30eb45df9f0b..32b55a4f0e5b 100644
--- a/drivers/infiniband/hw/ehca/ehca_hca.c
+++ b/drivers/infiniband/hw/ehca/ehca_hca.c
@@ -147,6 +147,7 @@ int ehca_query_port(struct ib_device *ibdev,
                 break;
         }
 
+        props->port_cap_flags  = rblock->capability_mask;
         props->gid_tbl_len     = rblock->gid_tbl_len;
         props->max_msg_sz      = rblock->max_msg_sz;
         props->bad_pkey_cntr   = rblock->bad_pkey_cntr;
@@ -236,10 +237,60 @@ query_gid1:
         return ret;
 }
 
+const u32 allowed_port_caps = (
+        IB_PORT_SM | IB_PORT_LED_INFO_SUP | IB_PORT_CM_SUP |
+        IB_PORT_SNMP_TUNNEL_SUP | IB_PORT_DEVICE_MGMT_SUP |
+        IB_PORT_VENDOR_CLASS_SUP);
+
 int ehca_modify_port(struct ib_device *ibdev,
                      u8 port, int port_modify_mask,
                      struct ib_port_modify *props)
 {
-        /* Not implemented yet */
-        return -EFAULT;
+        int ret = 0;
+        struct ehca_shca *shca = container_of(ibdev, struct ehca_shca, ib_device);
+        struct hipz_query_port *rblock;
+        u32 cap;
+        u64 hret;
+
+        if ((props->set_port_cap_mask | props->clr_port_cap_mask)
+            & ~allowed_port_caps) {
+                ehca_err(&shca->ib_device, "Non-changeable bits set in masks  "
+                         "set=%x  clr=%x  allowed=%x", props->set_port_cap_mask,
+                         props->clr_port_cap_mask, allowed_port_caps);
+                return -EINVAL;
+        }
+
+        if (mutex_lock_interruptible(&shca->modify_mutex))
+                return -ERESTARTSYS;
+
+        rblock = ehca_alloc_fw_ctrlblock(GFP_KERNEL);
+        if (!rblock) {
+                ehca_err(&shca->ib_device,  "Can't allocate rblock memory.");
+                ret = -ENOMEM;
+                goto modify_port1;
+        }
+
+        if (hipz_h_query_port(shca->ipz_hca_handle, port, rblock) != H_SUCCESS) {
+                ehca_err(&shca->ib_device, "Can't query port properties");
+                ret = -EINVAL;
+                goto modify_port2;
+        }
+
+        cap = (rblock->capability_mask | props->set_port_cap_mask)
+                & ~props->clr_port_cap_mask;
+
+        hret = hipz_h_modify_port(shca->ipz_hca_handle, port,
+                                  cap, props->init_type, port_modify_mask);
+        if (hret != H_SUCCESS) {
+                ehca_err(&shca->ib_device, "Modify port failed  hret=%lx", hret);
+                ret = -EINVAL;
+        }
+
+modify_port2:
+        ehca_free_fw_ctrlblock(rblock);
+
+modify_port1:
+        mutex_unlock(&shca->modify_mutex);
+
+        return ret;
 }
diff --git a/drivers/infiniband/hw/ehca/ehca_main.c b/drivers/infiniband/hw/ehca/ehca_main.c
index 059da9628bb5..3b23d677cb86 100644
--- a/drivers/infiniband/hw/ehca/ehca_main.c
+++ b/drivers/infiniband/hw/ehca/ehca_main.c
@@ -587,6 +587,7 @@ static int __devinit ehca_probe(struct ibmebus_dev *dev,
                 ehca_gen_err("Cannot allocate shca memory.");
                 return -ENOMEM;
         }
+        mutex_init(&shca->modify_mutex);
 
         shca->ibmebus_dev = dev;
         shca->ipz_hca_handle.handle = *handle;
diff --git a/drivers/infiniband/hw/ehca/hcp_if.c b/drivers/infiniband/hw/ehca/hcp_if.c
index 3fb46e67df87..b564fcd3b282 100644
--- a/drivers/infiniband/hw/ehca/hcp_if.c
+++ b/drivers/infiniband/hw/ehca/hcp_if.c
@@ -70,6 +70,10 @@
 #define H_ALL_RES_QP_SQUEUE_SIZE_PAGES  EHCA_BMASK_IBM(0, 31)
 #define H_ALL_RES_QP_RQUEUE_SIZE_PAGES  EHCA_BMASK_IBM(32, 63)
 
+#define H_MP_INIT_TYPE                  EHCA_BMASK_IBM(44, 47)
+#define H_MP_SHUTDOWN                   EHCA_BMASK_IBM(48, 48)
+#define H_MP_RESET_QKEY_CTR             EHCA_BMASK_IBM(49, 49)
+
 /* direct access qp controls */
 #define DAQP_CTRL_ENABLE    0x01
 #define DAQP_CTRL_SEND_COMP 0x20
@@ -364,6 +368,26 @@ u64 hipz_h_query_port(const struct ipz_adapter_handle adapter_handle,
         return ret;
 }
 
+u64 hipz_h_modify_port(const struct ipz_adapter_handle adapter_handle,
+                       const u8 port_id, const u32 port_cap,
+                       const u8 init_type, const int modify_mask)
+{
+        u64 port_attributes = port_cap;
+
+        if (modify_mask & IB_PORT_SHUTDOWN)
+                port_attributes |= EHCA_BMASK_SET(H_MP_SHUTDOWN, 1);
+        if (modify_mask & IB_PORT_INIT_TYPE)
+                port_attributes |= EHCA_BMASK_SET(H_MP_INIT_TYPE, init_type);
+        if (modify_mask & IB_PORT_RESET_QKEY_CNTR)
+                port_attributes |= EHCA_BMASK_SET(H_MP_RESET_QKEY_CTR, 1);
+
+        return ehca_plpar_hcall_norets(H_MODIFY_PORT,
+                                       adapter_handle.handle, /* r4 */
+                                       port_id,               /* r5 */
+                                       port_attributes,       /* r6 */
+                                       0, 0, 0, 0);
+}
+
 u64 hipz_h_query_hca(const struct ipz_adapter_handle adapter_handle,
                      struct hipz_query_hca *query_hca_rblock)
 {
diff --git a/drivers/infiniband/hw/ehca/hcp_if.h b/drivers/infiniband/hw/ehca/hcp_if.h
index 587ebd470959..2869f7dd6196 100644
--- a/drivers/infiniband/hw/ehca/hcp_if.h
+++ b/drivers/infiniband/hw/ehca/hcp_if.h
@@ -85,6 +85,10 @@ u64 hipz_h_query_port(const struct ipz_adapter_handle adapter_handle,
                       const u8 port_id,
                       struct hipz_query_port *query_port_response_block);
 
+u64 hipz_h_modify_port(const struct ipz_adapter_handle adapter_handle,
+                       const u8 port_id, const u32 port_cap,
+                       const u8 init_type, const int modify_mask);
+
 u64 hipz_h_query_hca(const struct ipz_adapter_handle adapter_handle,
                      struct hipz_query_hca *query_hca_rblock);