RDMA/nes: Clear stall bit before destroying NIC QP

Clear the stall bit to drop any incoming packets while destroying NIC
QP.  This will prevent a chip resource leak.

Signed-off-by: Chien Tung <chien.tin.tung@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/nes/nes_hw.c b/drivers/infiniband/hw/nes/nes_hw.c
index ce7f538..9250755 100644 (file)
--- a/drivers/infiniband/hw/nes/nes_hw.c
+++ b/drivers/infiniband/hw/nes/nes_hw.c
@@ -1899,9 +1899,14 @@ void nes_destroy_nic_qp(struct nes_vnic *nesvnic)
        u16  wqe_fragment_index;
        u64 wqe_frag;
        u32 cqp_head;
+       u32 wqm_cfg0;
        unsigned long flags;
        int ret;
 
+       /* clear wqe stall before destroying NIC QP */
+       wqm_cfg0 = nes_read_indexed(nesdev, NES_IDX_WQM_CONFIG0);
+       nes_write_indexed(nesdev, NES_IDX_WQM_CONFIG0, wqm_cfg0 & 0xFFFF7FFF);
+
        /* Free remaining NIC receive buffers */
        while (nesvnic->nic.rq_head != nesvnic->nic.rq_tail) {
                nic_rqe   = &nesvnic->nic.rq_vbase[nesvnic->nic.rq_tail];
@@ -2020,6 +2025,9 @@ void nes_destroy_nic_qp(struct nes_vnic *nesvnic)
 
        pci_free_consistent(nesdev->pcidev, nesvnic->nic_mem_size, nesvnic->nic_vbase,
                        nesvnic->nic_pbase);
+
+       /* restore old wqm_cfg0 value */
+       nes_write_indexed(nesdev, NES_IDX_WQM_CONFIG0, wqm_cfg0);
 }
 
 /**

diff --git a/drivers/infiniband/hw/nes/nes_hw.h b/drivers/infiniband/hw/nes/nes_hw.h
index 9b1e7f8..bbbfe9f 100644 (file)
--- a/drivers/infiniband/hw/nes/nes_hw.h
+++ b/drivers/infiniband/hw/nes/nes_hw.h
@@ -160,6 +160,7 @@ enum indexed_regs {
        NES_IDX_ENDNODE0_NSTAT_TX_OCTETS_HI = 0x7004,
        NES_IDX_ENDNODE0_NSTAT_TX_FRAMES_LO = 0x7008,
        NES_IDX_ENDNODE0_NSTAT_TX_FRAMES_HI = 0x700c,
+       NES_IDX_WQM_CONFIG0 = 0x5000,
        NES_IDX_WQM_CONFIG1 = 0x5004,
        NES_IDX_CM_CONFIG = 0x5100,
        NES_IDX_NIC_LOGPORT_TO_PHYPORT = 0x6000,