1 /*- 2 * BSD LICENSE 3 * 4 * Copyright (c) 2015-2016 Amazon.com, Inc. or its affiliates. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of copyright holder nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #ifndef ENA_ETH_COM_H_ 35 #define ENA_ETH_COM_H_ 36 37 #if defined(__cplusplus) 38 extern "C" { 39 #endif 40 #include "ena_com.h" 41 42 /* head update threshold in units of (queue size / ENA_COMP_HEAD_THRESH) */ 43 #define ENA_COMP_HEAD_THRESH 4 44 45 struct ena_com_tx_ctx { 46 struct ena_com_tx_meta ena_meta; 47 struct ena_com_buf *ena_bufs; 48 /* For LLQ, header buffer - pushed to the device mem space */ 49 void *push_header; 50 51 enum ena_eth_io_l3_proto_index l3_proto; 52 enum ena_eth_io_l4_proto_index l4_proto; 53 u16 num_bufs; 54 u16 req_id; 55 /* For regular queue, indicate the size of the header 56 * For LLQ, indicate the size of the pushed buffer 57 */ 58 u16 header_len; 59 60 u8 meta_valid; 61 u8 tso_enable; 62 u8 l3_csum_enable; 63 u8 l4_csum_enable; 64 u8 l4_csum_partial; 65 u8 df; /* Don't fragment */ 66 }; 67 68 struct ena_com_rx_ctx { 69 struct ena_com_rx_buf_info *ena_bufs; 70 enum ena_eth_io_l3_proto_index l3_proto; 71 enum ena_eth_io_l4_proto_index l4_proto; 72 bool l3_csum_err; 73 bool l4_csum_err; 74 /* fragmented packet */ 75 bool frag; 76 u32 hash; 77 u16 descs; 78 int max_bufs; 79 }; 80 81 int ena_com_prepare_tx(struct ena_com_io_sq *io_sq, 82 struct ena_com_tx_ctx *ena_tx_ctx, 83 int *nb_hw_desc); 84 85 int ena_com_rx_pkt(struct ena_com_io_cq *io_cq, 86 struct ena_com_io_sq *io_sq, 87 struct ena_com_rx_ctx *ena_rx_ctx); 88 89 int ena_com_add_single_rx_desc(struct ena_com_io_sq *io_sq, 90 struct ena_com_buf *ena_buf, 91 u16 req_id); 92 93 int ena_com_tx_comp_req_id_get(struct ena_com_io_cq *io_cq, u16 *req_id); 94 95 bool ena_com_cq_empty(struct ena_com_io_cq *io_cq); 96 97 static inline void ena_com_unmask_intr(struct ena_com_io_cq *io_cq, 98 struct ena_eth_io_intr_reg *intr_reg) 99 { 100 ENA_REG_WRITE32(io_cq->bus, intr_reg->intr_control, io_cq->unmask_reg); 101 } 102 103 static inline int ena_com_sq_empty_space(struct ena_com_io_sq *io_sq) 104 { 105 u16 tail, next_to_comp, cnt; 106 107 next_to_comp = io_sq->next_to_comp; 108 tail = io_sq->tail; 109 cnt = tail - next_to_comp; 110 111 return io_sq->q_depth - 1 - cnt; 112 } 113 114 static inline int ena_com_write_sq_doorbell(struct ena_com_io_sq *io_sq) 115 { 116 u16 tail; 117 118 tail = io_sq->tail; 119 120 ena_trc_dbg("write submission queue doorbell for queue: %d tail: %d\n", 121 io_sq->qid, tail); 122 123 ENA_REG_WRITE32(io_sq->bus, tail, io_sq->db_addr); 124 125 return 0; 126 } 127 128 static inline int ena_com_update_dev_comp_head(struct ena_com_io_cq *io_cq) 129 { 130 u16 unreported_comp, head; 131 bool need_update; 132 133 head = io_cq->head; 134 unreported_comp = head - io_cq->last_head_update; 135 need_update = unreported_comp > (io_cq->q_depth / ENA_COMP_HEAD_THRESH); 136 137 if (io_cq->cq_head_db_reg && need_update) { 138 ena_trc_dbg("Write completion queue doorbell for queue %d: head: %d\n", 139 io_cq->qid, head); 140 ENA_REG_WRITE32(io_cq->bus, head, io_cq->cq_head_db_reg); 141 io_cq->last_head_update = head; 142 } 143 144 return 0; 145 } 146 147 static inline void ena_com_update_numa_node(struct ena_com_io_cq *io_cq, 148 u8 numa_node) 149 { 150 struct ena_eth_io_numa_node_cfg_reg numa_cfg; 151 152 if (!io_cq->numa_node_cfg_reg) 153 return; 154 155 numa_cfg.numa_cfg = (numa_node & ENA_ETH_IO_NUMA_NODE_CFG_REG_NUMA_MASK) 156 | ENA_ETH_IO_NUMA_NODE_CFG_REG_ENABLED_MASK; 157 158 ENA_REG_WRITE32(io_cq->bus, numa_cfg.numa_cfg, io_cq->numa_node_cfg_reg); 159 } 160 161 static inline void ena_com_comp_ack(struct ena_com_io_sq *io_sq, u16 elem) 162 { 163 io_sq->next_to_comp += elem; 164 } 165 166 #if defined(__cplusplus) 167 } 168 #endif 169 #endif /* ENA_ETH_COM_H_ */ 170