1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright 2008-2017 Cisco Systems, Inc. All rights reserved. 3 * Copyright 2007 Nuova Systems, Inc. All rights reserved. 4 */ 5 6 #include "enic.h" 7 #include "vnic_dev.h" 8 #include "vnic_rq.h" 9 10 void vnic_rq_init_start(struct vnic_rq *rq, unsigned int cq_index, 11 unsigned int fetch_index, unsigned int posted_index, 12 unsigned int error_interrupt_enable, 13 unsigned int error_interrupt_offset) 14 { 15 u64 paddr; 16 unsigned int count = rq->ring.desc_count; 17 18 paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET; 19 ENIC_BUS_WRITE_8(rq->ctrl, RX_RING_BASE, paddr); 20 ENIC_BUS_WRITE_4(rq->ctrl, RX_RING_SIZE, count); 21 ENIC_BUS_WRITE_4(rq->ctrl, RX_CQ_INDEX, cq_index); 22 ENIC_BUS_WRITE_4(rq->ctrl, RX_ERROR_INTR_ENABLE, error_interrupt_enable); 23 ENIC_BUS_WRITE_4(rq->ctrl, RX_ERROR_INTR_OFFSET, error_interrupt_offset); 24 ENIC_BUS_WRITE_4(rq->ctrl, RX_ERROR_STATUS, 0); 25 ENIC_BUS_WRITE_4(rq->ctrl, RX_FETCH_INDEX, fetch_index); 26 ENIC_BUS_WRITE_4(rq->ctrl, RX_POSTED_INDEX, posted_index); 27 } 28 29 void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index, 30 unsigned int error_interrupt_enable, 31 unsigned int error_interrupt_offset) 32 { 33 u32 fetch_index = 0; 34 35 /* Use current fetch_index as the ring starting point */ 36 fetch_index = ENIC_BUS_READ_4(rq->ctrl, RX_FETCH_INDEX); 37 38 if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */ 39 /* Hardware surprise removal: reset fetch_index */ 40 fetch_index = 0; 41 } 42 43 vnic_rq_init_start(rq, cq_index, 44 fetch_index, fetch_index, 45 error_interrupt_enable, 46 error_interrupt_offset); 47 rq->rxst_idx = 0; 48 rq->tot_pkts = 0; 49 } 50 51 unsigned int vnic_rq_error_status(struct vnic_rq *rq) 52 { 53 return ENIC_BUS_READ_4(rq->ctrl, RX_ERROR_STATUS); 54 } 55 56 void vnic_rq_enable(struct vnic_rq *rq) 57 { 58 ENIC_BUS_WRITE_4(rq->ctrl, RX_ENABLE, 1); 59 } 60 61 int vnic_rq_disable(struct vnic_rq *rq) 62 { 63 unsigned int wait; 64 65 ENIC_BUS_WRITE_4(rq->ctrl, RX_ENABLE, 0); 66 67 /* Wait for HW to ACK disable request */ 68 for (wait = 0; wait < 1000; wait++) { 69 if (!(ENIC_BUS_READ_4(rq->ctrl, RX_RUNNING))) 70 return 0; 71 udelay(10); 72 } 73 74 pr_err("Failed to disable RQ[%d]\n", rq->index); 75 76 return -ETIMEDOUT; 77 } 78 79 void vnic_rq_clean(struct vnic_rq *rq) 80 { 81 u32 fetch_index; 82 unsigned int count = rq->ring.desc_count; 83 84 rq->ring.desc_avail = count - 1; 85 rq->rx_nb_hold = 0; 86 87 /* Use current fetch_index as the ring starting point */ 88 fetch_index = ENIC_BUS_READ_4(rq->ctrl, RX_FETCH_INDEX); 89 if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */ 90 /* Hardware surprise removal: reset fetch_index */ 91 fetch_index = 0; 92 } 93 94 ENIC_BUS_WRITE_4(rq->ctrl, RX_POSTED_INDEX, fetch_index); 95 96 vnic_dev_clear_desc_ring(&rq->ring); 97 } 98