RDMA/bnxt_re: Fail probe early when not enough MSI-x vectors are reserved

L2 driver allocates and populates the MSI-x vector details for RoCE
in the en_dev structure. RoCE driver requires minimum 2 MSIx vectors.
Hence during probe, driver has to check and bail out if there are not
enough MSI-x vectors reserved for it before proceeding further
initialization.

Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Hongguang Gao <hongguang.gao@broadcom.com>
Reviewed-by: Bhargava Chenna Marreddy <bhargava.marreddy@broadcom.com>
Reviewed-by: Kashyap Desai <kashyap.desai@broadcom.com>
Reviewed-by: Chandramohan Akula <chandramohan.akula@broadcom.com>
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://patch.msgid.link/1731577748-1804-2-git-send-email-selvin.xavier@broadcom.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

diff --git a/drivers/infiniband/hw/bnxt_re/bnxt_re.h b/drivers/infiniband/hw/bnxt_re/bnxt_re.h
index d1b7c2029bdc6fffc260a78417dca14f9b3daf32..7abc37bed6d5e125cc209dfb387f78926f5513c9 100644 (file)
--- a/drivers/infiniband/hw/bnxt_re/bnxt_re.h
+++ b/drivers/infiniband/hw/bnxt_re/bnxt_re.h
@@ -154,6 +154,8 @@ struct bnxt_re_pacing {
 
 #define BNXT_RE_GRC_FIFO_REG_BASE 0x2000
 
+#define BNXT_RE_MIN_MSIX               2
+
 #define MAX_CQ_HASH_BITS               (16)
 #define MAX_SRQ_HASH_BITS              (16)
 

diff --git a/drivers/infiniband/hw/bnxt_re/main.c b/drivers/infiniband/hw/bnxt_re/main.c
index cb61941672f628a423bafcf8880743c7e09fb7e1..c262a16e42198275fb2ff497a65b56c91caee031 100644 (file)
--- a/drivers/infiniband/hw/bnxt_re/main.c
+++ b/drivers/infiniband/hw/bnxt_re/main.c
@@ -1936,6 +1936,18 @@ static int bnxt_re_dev_init(struct bnxt_re_dev *rdev, u8 op_type)
        }
        set_bit(BNXT_RE_FLAG_NETDEV_REGISTERED, &rdev->flags);
 
+       if (rdev->en_dev->ulp_tbl->msix_requested < BNXT_RE_MIN_MSIX) {
+               ibdev_err(&rdev->ibdev,
+                         "RoCE requires minimum 2 MSI-X vectors, but only %d reserved\n",
+                         rdev->en_dev->ulp_tbl->msix_requested);
+               bnxt_unregister_dev(rdev->en_dev);
+               clear_bit(BNXT_RE_FLAG_NETDEV_REGISTERED, &rdev->flags);
+               return -EINVAL;
+       }
+       ibdev_dbg(&rdev->ibdev, "Got %d MSI-X vectors\n",
+                 rdev->en_dev->ulp_tbl->msix_requested);
+       rdev->num_msix = rdev->en_dev->ulp_tbl->msix_requested;
+
        rc = bnxt_re_setup_chip_ctx(rdev);
        if (rc) {
                bnxt_unregister_dev(rdev->en_dev);
@@ -1947,16 +1959,6 @@ static int bnxt_re_dev_init(struct bnxt_re_dev *rdev, u8 op_type)
        /* Check whether VF or PF */
        bnxt_re_get_sriov_func_type(rdev);
 
-       if (!rdev->en_dev->ulp_tbl->msix_requested) {
-               ibdev_err(&rdev->ibdev,
-                         "Failed to get MSI-X vectors: %#x\n", rc);
-               rc = -EINVAL;
-               goto fail;
-       }
-       ibdev_dbg(&rdev->ibdev, "Got %d MSI-X vectors\n",
-                 rdev->en_dev->ulp_tbl->msix_requested);
-       rdev->num_msix = rdev->en_dev->ulp_tbl->msix_requested;
-
        bnxt_re_query_hwrm_intf_version(rdev);
 
        /* Establish RCFW Communication Channel to initialize the context