IB: Add CQ comp_vector support

Add a num_comp_vectors member to struct ib_device and extend
ib_create_cq() to pass in a comp_vector parameter -- this parallels
the userspace libibverbs API.  Update all hardware drivers to set
num_comp_vectors to 1 and have all ULPs pass 0 for the comp_vector
value.  Pass the value of num_comp_vectors to userspace rather than
hard-coding a value of 1.

We want multiple CQ event vector support (via MSI-X or similar for
adapters that can generate multiple interrupts), but it's not clear
how many vectors we want, or how we want to deal with policy issues
such as how to decide which vector to use or how to set up interrupt
affinity.  This patch is useful for experimenting, since no core
changes will be necessary when updating a driver to support multiple
vectors, and we know that we want to make at least these changes
anyway.

Signed-off-by: Michael S. Tsirkin <mst@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

9 files changed, 13 insertions, 7 deletions

diff --git a/drivers/infiniband/hw/amso1100/c2_provider.c b/drivers/infiniband/hw/amso1100/c2_provider.c
index 607c09bf764c..109166223c09 100644
--- a/drivers/infiniband/hw/amso1100/c2_provider.c
+++ b/drivers/infiniband/hw/amso1100/c2_provider.c
@@ -290,7 +290,7 @@ static int c2_destroy_qp(struct ib_qp *ib_qp)
         return 0;
 }
 
-static struct ib_cq *c2_create_cq(struct ib_device *ibdev, int entries,
+static struct ib_cq *c2_create_cq(struct ib_device *ibdev, int entries, int vector,
                                   struct ib_ucontext *context,
                                   struct ib_udata *udata)
 {
@@ -795,6 +795,7 @@ int c2_register_device(struct c2_dev *dev)
         memset(&dev->ibdev.node_guid, 0, sizeof(dev->ibdev.node_guid));
         memcpy(&dev->ibdev.node_guid, dev->pseudo_netdev->dev_addr, 6);
         dev->ibdev.phys_port_cnt = 1;
+        dev->ibdev.num_comp_vectors = 1;
         dev->ibdev.dma_device = &dev->pcidev->dev;
         dev->ibdev.query_device = c2_query_device;
         dev->ibdev.query_port = c2_query_port;
diff --git a/drivers/infiniband/hw/cxgb3/iwch_provider.c b/drivers/infiniband/hw/cxgb3/iwch_provider.c
index 93038c007133..78a495f5332e 100644
--- a/drivers/infiniband/hw/cxgb3/iwch_provider.c
+++ b/drivers/infiniband/hw/cxgb3/iwch_provider.c
@@ -139,7 +139,7 @@ static int iwch_destroy_cq(struct ib_cq *ib_cq)
         return 0;
 }
 
-static struct ib_cq *iwch_create_cq(struct ib_device *ibdev, int entries,
+static struct ib_cq *iwch_create_cq(struct ib_device *ibdev, int entries, int vector,
                              struct ib_ucontext *ib_context,
                              struct ib_udata *udata)
 {
@@ -1110,6 +1110,7 @@ int iwch_register_device(struct iwch_dev *dev)
         dev->ibdev.node_type = RDMA_NODE_RNIC;
         memcpy(dev->ibdev.node_desc, IWCH_NODE_DESC, sizeof(IWCH_NODE_DESC));
         dev->ibdev.phys_port_cnt = dev->rdev.port_info.nports;
+        dev->ibdev.num_comp_vectors = 1;
         dev->ibdev.dma_device = &(dev->rdev.rnic_info.pdev->dev);
         dev->ibdev.query_device = iwch_query_device;
         dev->ibdev.query_port = iwch_query_port;
diff --git a/drivers/infiniband/hw/ehca/ehca_cq.c b/drivers/infiniband/hw/ehca/ehca_cq.c
index e2cdc1a16fe9..67f0670fe3b1 100644
--- a/drivers/infiniband/hw/ehca/ehca_cq.c
+++ b/drivers/infiniband/hw/ehca/ehca_cq.c
@@ -113,7 +113,7 @@ struct ehca_qp* ehca_cq_get_qp(struct ehca_cq *cq, int real_qp_num)
         return ret;
 }
 
-struct ib_cq *ehca_create_cq(struct ib_device *device, int cqe,
+struct ib_cq *ehca_create_cq(struct ib_device *device, int cqe, int comp_vector,
                              struct ib_ucontext *context,
                              struct ib_udata *udata)
 {
diff --git a/drivers/infiniband/hw/ehca/ehca_iverbs.h b/drivers/infiniband/hw/ehca/ehca_iverbs.h
index 95fd59fb4528..aff96ac4fd12 100644
--- a/drivers/infiniband/hw/ehca/ehca_iverbs.h
+++ b/drivers/infiniband/hw/ehca/ehca_iverbs.h
@@ -123,7 +123,7 @@ int ehca_destroy_eq(struct ehca_shca *shca, struct ehca_eq *eq);
 void *ehca_poll_eq(struct ehca_shca *shca, struct ehca_eq *eq);
 
 
-struct ib_cq *ehca_create_cq(struct ib_device *device, int cqe,
+struct ib_cq *ehca_create_cq(struct ib_device *device, int cqe, int comp_vector,
                              struct ib_ucontext *context,
                              struct ib_udata *udata);
 
diff --git a/drivers/infiniband/hw/ehca/ehca_main.c b/drivers/infiniband/hw/ehca/ehca_main.c
index 3b23d677cb86..77bb36bba0d8 100644
--- a/drivers/infiniband/hw/ehca/ehca_main.c
+++ b/drivers/infiniband/hw/ehca/ehca_main.c
@@ -313,6 +313,7 @@ int ehca_init_device(struct ehca_shca *shca)
 
         shca->ib_device.node_type           = RDMA_NODE_IB_CA;
         shca->ib_device.phys_port_cnt       = shca->num_ports;
+        shca->ib_device.num_comp_vectors    = 1;
         shca->ib_device.dma_device          = &shca->ibmebus_dev->ofdev.dev;
         shca->ib_device.query_device        = ehca_query_device;
         shca->ib_device.query_port          = ehca_query_port;
@@ -375,7 +376,7 @@ static int ehca_create_aqp1(struct ehca_shca *shca, u32 port)
                 return -EPERM;
         }
 
-        ibcq = ib_create_cq(&shca->ib_device, NULL, NULL, (void*)(-1), 10);
+        ibcq = ib_create_cq(&shca->ib_device, NULL, NULL, (void*)(-1), 10, 0);
         if (IS_ERR(ibcq)) {
                 ehca_err(&shca->ib_device, "Cannot create AQP1 CQ.");
                 return PTR_ERR(ibcq);
diff --git a/drivers/infiniband/hw/ipath/ipath_cq.c b/drivers/infiniband/hw/ipath/ipath_cq.c
index 4715f89528cd..00d3eb9bc696 100644
--- a/drivers/infiniband/hw/ipath/ipath_cq.c
+++ b/drivers/infiniband/hw/ipath/ipath_cq.c
@@ -204,7 +204,7 @@ static void send_complete(unsigned long data)
  *
  * Called by ib_create_cq() in the generic verbs code.
  */
-struct ib_cq *ipath_create_cq(struct ib_device *ibdev, int entries,
+struct ib_cq *ipath_create_cq(struct ib_device *ibdev, int entries, int comp_vector,
                               struct ib_ucontext *context,
                               struct ib_udata *udata)
 {
diff --git a/drivers/infiniband/hw/ipath/ipath_verbs.c b/drivers/infiniband/hw/ipath/ipath_verbs.c
index b676ea81fc41..12933e77c7e9 100644
--- a/drivers/infiniband/hw/ipath/ipath_verbs.c
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.c
@@ -1561,6 +1561,7 @@ int ipath_register_ib_device(struct ipath_devdata *dd)
                 (1ull << IB_USER_VERBS_CMD_POST_SRQ_RECV);
         dev->node_type = RDMA_NODE_IB_CA;
         dev->phys_port_cnt = 1;
+        dev->num_comp_vectors = 1;
         dev->dma_device = &dd->pcidev->dev;
         dev->query_device = ipath_query_device;
         dev->modify_device = ipath_modify_device;
diff --git a/drivers/infiniband/hw/ipath/ipath_verbs.h b/drivers/infiniband/hw/ipath/ipath_verbs.h
index ac66c00a2976..2d734fb6eff7 100644
--- a/drivers/infiniband/hw/ipath/ipath_verbs.h
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.h
@@ -735,7 +735,7 @@ int ipath_destroy_srq(struct ib_srq *ibsrq);
 
 int ipath_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *entry);
 
-struct ib_cq *ipath_create_cq(struct ib_device *ibdev, int entries,
+struct ib_cq *ipath_create_cq(struct ib_device *ibdev, int entries, int comp_vector,
                               struct ib_ucontext *context,
                               struct ib_udata *udata);
 
diff --git a/drivers/infiniband/hw/mthca/mthca_provider.c b/drivers/infiniband/hw/mthca/mthca_provider.c
index 47e6fd46d9c2..1c05486c3c68 100644
--- a/drivers/infiniband/hw/mthca/mthca_provider.c
+++ b/drivers/infiniband/hw/mthca/mthca_provider.c
@@ -663,6 +663,7 @@ static int mthca_destroy_qp(struct ib_qp *qp)
 }
 
 static struct ib_cq *mthca_create_cq(struct ib_device *ibdev, int entries,
+                                     int comp_vector,
                                      struct ib_ucontext *context,
                                      struct ib_udata *udata)
 {
@@ -1292,6 +1293,7 @@ int mthca_register_device(struct mthca_dev *dev)
                 (1ull << IB_USER_VERBS_CMD_DETACH_MCAST);
         dev->ib_dev.node_type            = RDMA_NODE_IB_CA;
         dev->ib_dev.phys_port_cnt        = dev->limits.num_ports;
+        dev->ib_dev.num_comp_vectors     = 1;
         dev->ib_dev.dma_device           = &dev->pdev->dev;
         dev->ib_dev.query_device         = mthca_query_device;
         dev->ib_dev.query_port           = mthca_query_port;