RDMA/qedr: notify user application if DPM is supported

Direct Packet Mode support may be disabled, e.g, due to limited
resources. Notifying the user application prevents wasting cycles
on attempting to send these kind of packets.

Signed-off-by: Ram Amrani <Ram.Amrani@cavium.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/qedr/main.c b/drivers/infiniband/hw/qedr/main.c
index 0ae30f5..199b6ed 100644 (file)
--- a/drivers/infiniband/hw/qedr/main.c
+++ b/drivers/infiniband/hw/qedr/main.c
@@ -777,6 +777,7 @@ static struct qedr_dev *qedr_add(struct qed_dev *cdev, struct pci_dev *pdev,
        if (rc)
                goto init_err;
 
+       dev->user_dpm_enabled = dev_info.user_dpm_enabled;
        dev->num_hwfns = dev_info.common.num_hwfns;
        dev->rdma_ctx = dev->ops->rdma_get_rdma_ctx(cdev);
 

diff --git a/drivers/infiniband/hw/qedr/qedr.h b/drivers/infiniband/hw/qedr/qedr.h
index 392e76e..b2bb42e 100644 (file)
--- a/drivers/infiniband/hw/qedr/qedr.h
+++ b/drivers/infiniband/hw/qedr/qedr.h
@@ -162,6 +162,8 @@ struct qedr_dev {
        struct qedr_qp          *gsi_qp;
 
        unsigned long enet_state;
+
+       u8 user_dpm_enabled;
 };
 
 #define QEDR_MAX_SQ_PBL                        (0x8000)

diff --git a/drivers/infiniband/hw/qedr/verbs.c b/drivers/infiniband/hw/qedr/verbs.c
index 2ae71b8..4322ee0 100644 (file)
--- a/drivers/infiniband/hw/qedr/verbs.c
+++ b/drivers/infiniband/hw/qedr/verbs.c
@@ -376,6 +376,7 @@ struct ib_ucontext *qedr_alloc_ucontext(struct ib_device *ibdev,
 
        memset(&uresp, 0, sizeof(uresp));
 
+       uresp.dpm_enabled = dev->user_dpm_enabled;
        uresp.db_pa = ctx->dpi_phys_addr;
        uresp.db_size = ctx->dpi_size;
        uresp.max_send_wr = dev->attr.max_sqe;

diff --git a/include/uapi/rdma/qedr-abi.h b/include/uapi/rdma/qedr-abi.h
index 75c270d..2684004 100644 (file)
--- a/include/uapi/rdma/qedr-abi.h
+++ b/include/uapi/rdma/qedr-abi.h
@@ -49,6 +49,7 @@ struct qedr_alloc_ucontext_resp {
        __u32 sges_per_recv_wr;
        __u32 sges_per_srq_wr;
        __u32 max_cqes;
+       __u8 dpm_enabled;
 };
 
 struct qedr_alloc_pd_ureq {