IB/core: Add creation flags to struct ib_qp_init_attr

Add a create_flags member to struct ib_qp_init_attr that will allow a
kernel verbs consumer to create a pass special flags when creating a QP.
Add a flag value for telling low-level drivers that a QP will be used
for IPoIB UD LSO.  The create_flags member will also be useful for XRC
and ehca low-latency QP support.

Since no create_flags handling is implemented yet, add code to all
low-level drivers to return -EINVAL if create_flags is non-zero.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

8 files changed, 26 insertions, 0 deletions

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 495c803fb11d..9e98cec6230f 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -1065,6 +1065,7 @@ ssize_t ib_uverbs_create_qp(struct ib_uverbs_file *file,
         attr.srq           = srq;
         attr.sq_sig_type   = cmd.sq_sig_all ? IB_SIGNAL_ALL_WR : IB_SIGNAL_REQ_WR;
         attr.qp_type       = cmd.qp_type;
+        attr.create_flags  = 0;
 
         attr.cap.max_send_wr     = cmd.max_send_wr;
         attr.cap.max_recv_wr     = cmd.max_recv_wr;
diff --git a/drivers/infiniband/hw/amso1100/c2_provider.c b/drivers/infiniband/hw/amso1100/c2_provider.c
index 21fb46d39319..e10d27a6e145 100644
--- a/drivers/infiniband/hw/amso1100/c2_provider.c
+++ b/drivers/infiniband/hw/amso1100/c2_provider.c
@@ -245,6 +245,9 @@ static struct ib_qp *c2_create_qp(struct ib_pd *pd,
 
         pr_debug("%s:%u\n", __func__, __LINE__);
 
+        if (init_attr->create_flags)
+                return ERR_PTR(-EINVAL);
+
         switch (init_attr->qp_type) {
         case IB_QPT_RC:
                 qp = kzalloc(sizeof(*qp), GFP_KERNEL);
diff --git a/drivers/infiniband/hw/ehca/ehca_qp.c b/drivers/infiniband/hw/ehca/ehca_qp.c
index a9fd419855cb..3eb14a52cbf2 100644
--- a/drivers/infiniband/hw/ehca/ehca_qp.c
+++ b/drivers/infiniband/hw/ehca/ehca_qp.c
@@ -421,6 +421,9 @@ static struct ehca_qp *internal_create_qp(
         u32 swqe_size = 0, rwqe_size = 0, ib_qp_num;
         unsigned long flags;
 
+        if (init_attr->create_flags)
+                return ERR_PTR(-EINVAL);
+
         memset(&parms, 0, sizeof(parms));
         qp_type = init_attr->qp_type;
 
diff --git a/drivers/infiniband/hw/ipath/ipath_qp.c b/drivers/infiniband/hw/ipath/ipath_qp.c
index 6a4a5e3b78ba..812b42c500e1 100644
--- a/drivers/infiniband/hw/ipath/ipath_qp.c
+++ b/drivers/infiniband/hw/ipath/ipath_qp.c
@@ -747,6 +747,11 @@ struct ib_qp *ipath_create_qp(struct ib_pd *ibpd,
         size_t sz;
         struct ib_qp *ret;
 
+        if (init_attr->create_flags) {
+                ret = ERR_PTR(-EINVAL);
+                goto bail;
+        }
+
         if (init_attr->cap.max_send_sge > ib_ipath_max_sges ||
             init_attr->cap.max_send_wr > ib_ipath_max_qp_wrs) {
                 ret = ERR_PTR(-EINVAL);
diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index 31b2b5b230bd..320c25fa74b1 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -673,6 +673,9 @@ struct ib_qp *mlx4_ib_create_qp(struct ib_pd *pd,
         struct mlx4_ib_qp *qp;
         int err;
 
+        if (init_attr->create_flags)
+                return ERR_PTR(-EINVAL);
+
         switch (init_attr->qp_type) {
         case IB_QPT_RC:
         case IB_QPT_UC:
diff --git a/drivers/infiniband/hw/mthca/mthca_provider.c b/drivers/infiniband/hw/mthca/mthca_provider.c
index ee9bc1456226..81b257e18bb6 100644
--- a/drivers/infiniband/hw/mthca/mthca_provider.c
+++ b/drivers/infiniband/hw/mthca/mthca_provider.c
@@ -540,6 +540,9 @@ static struct ib_qp *mthca_create_qp(struct ib_pd *pd,
         struct mthca_qp *qp;
         int err;
 
+        if (init_attr->create_flags)
+                return ERR_PTR(-EINVAL);
+
         switch (init_attr->qp_type) {
         case IB_QPT_RC:
         case IB_QPT_UC:
diff --git a/drivers/infiniband/hw/nes/nes_verbs.c b/drivers/infiniband/hw/nes/nes_verbs.c
index 46b3b8ebcc14..7c27420c2240 100644
--- a/drivers/infiniband/hw/nes/nes_verbs.c
+++ b/drivers/infiniband/hw/nes/nes_verbs.c
@@ -1252,6 +1252,9 @@ static struct ib_qp *nes_create_qp(struct ib_pd *ibpd,
         u8 rq_encoded_size;
         /* int counter; */
 
+        if (init_attr->create_flags)
+                return ERR_PTR(-EINVAL);
+
         atomic_inc(&qps_created);
         switch (init_attr->qp_type) {
                 case IB_QPT_RC:
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 40ff51244d19..c3299be41c6f 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -495,6 +495,10 @@ enum ib_qp_type {
         IB_QPT_RAW_ETY
 };
 
+enum ib_qp_create_flags {
+        IB_QP_CREATE_IPOIB_UD_LSO       = 1 << 0,
+};
+
 struct ib_qp_init_attr {
         void                  (*event_handler)(struct ib_event *, void *);
         void                   *qp_context;
@@ -504,6 +508,7 @@ struct ib_qp_init_attr {
         struct ib_qp_cap        cap;
         enum ib_sig_type        sq_sig_type;
         enum ib_qp_type         qp_type;
+        enum ib_qp_create_flags create_flags;
         u8                      port_num; /* special QP types only */
 };