1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /**************************************************************************** 3 * Driver for Solarflare network controllers and boards 4 * Copyright 2010-2012 Solarflare Communications Inc. 5 */ 6 #ifndef _VFDI_H 7 #define _VFDI_H 8 9 /** 10 * DOC: Virtual Function Driver Interface 11 * 12 * This file contains software structures used to form a two way 13 * communication channel between the VF driver and the PF driver, 14 * named Virtual Function Driver Interface (VFDI). 15 * 16 * For the purposes of VFDI, a page is a memory region with size and 17 * alignment of 4K. All addresses are DMA addresses to be used within 18 * the domain of the relevant VF. 19 * 20 * The only hardware-defined channels for a VF driver to communicate 21 * with the PF driver are the event mailboxes (%FR_CZ_USR_EV 22 * registers). Writing to these registers generates an event with 23 * EV_CODE = EV_CODE_USR_EV, USER_QID set to the index of the mailbox 24 * and USER_EV_REG_VALUE set to the value written. The PF driver may 25 * direct or disable delivery of these events by setting 26 * %FR_CZ_USR_EV_CFG. 27 * 28 * The PF driver can send arbitrary events to arbitrary event queues. 29 * However, for consistency, VFDI events from the PF are defined to 30 * follow the same form and be sent to the first event queue assigned 31 * to the VF while that queue is enabled by the VF driver. 32 * 33 * The general form of the variable bits of VFDI events is: 34 * 35 * 0 16 24 31 36 * | DATA | TYPE | SEQ | 37 * 38 * SEQ is a sequence number which should be incremented by 1 (modulo 39 * 256) for each event. The sequence numbers used in each direction 40 * are independent. 41 * 42 * The VF submits requests of type &struct vfdi_req by sending the 43 * address of the request (ADDR) in a series of 4 events: 44 * 45 * 0 16 24 31 46 * | ADDR[0:15] | VFDI_EV_TYPE_REQ_WORD0 | SEQ | 47 * | ADDR[16:31] | VFDI_EV_TYPE_REQ_WORD1 | SEQ+1 | 48 * | ADDR[32:47] | VFDI_EV_TYPE_REQ_WORD2 | SEQ+2 | 49 * | ADDR[48:63] | VFDI_EV_TYPE_REQ_WORD3 | SEQ+3 | 50 * 51 * The address must be page-aligned. After receiving such a valid 52 * series of events, the PF driver will attempt to read the request 53 * and write a response to the same address. In case of an invalid 54 * sequence of events or a DMA error, there will be no response. 55 * 56 * The VF driver may request that the PF driver writes status 57 * information into its domain asynchronously. After writing the 58 * status, the PF driver will send an event of the form: 59 * 60 * 0 16 24 31 61 * | reserved | VFDI_EV_TYPE_STATUS | SEQ | 62 * 63 * In case the VF must be reset for any reason, the PF driver will 64 * send an event of the form: 65 * 66 * 0 16 24 31 67 * | reserved | VFDI_EV_TYPE_RESET | SEQ | 68 * 69 * It is then the responsibility of the VF driver to request 70 * reinitialisation of its queues. 71 */ 72 #define VFDI_EV_SEQ_LBN 24 73 #define VFDI_EV_SEQ_WIDTH 8 74 #define VFDI_EV_TYPE_LBN 16 75 #define VFDI_EV_TYPE_WIDTH 8 76 #define VFDI_EV_TYPE_REQ_WORD0 0 77 #define VFDI_EV_TYPE_REQ_WORD1 1 78 #define VFDI_EV_TYPE_REQ_WORD2 2 79 #define VFDI_EV_TYPE_REQ_WORD3 3 80 #define VFDI_EV_TYPE_STATUS 4 81 #define VFDI_EV_TYPE_RESET 5 82 #define VFDI_EV_DATA_LBN 0 83 #define VFDI_EV_DATA_WIDTH 16 84 85 struct vfdi_endpoint { 86 u8 mac_addr[ETH_ALEN]; 87 __be16 tci; 88 }; 89 90 /** 91 * enum vfdi_op - VFDI operation enumeration 92 * @VFDI_OP_RESPONSE: Indicates a response to the request. 93 * @VFDI_OP_INIT_EVQ: Initialize SRAM entries and initialize an EVQ. 94 * @VFDI_OP_INIT_RXQ: Initialize SRAM entries and initialize an RXQ. 95 * @VFDI_OP_INIT_TXQ: Initialize SRAM entries and initialize a TXQ. 96 * @VFDI_OP_FINI_ALL_QUEUES: Flush all queues, finalize all queues, then 97 * finalize the SRAM entries. 98 * @VFDI_OP_INSERT_FILTER: Insert a MAC filter targeting the given RXQ. 99 * @VFDI_OP_REMOVE_ALL_FILTERS: Remove all filters. 100 * @VFDI_OP_SET_STATUS_PAGE: Set the DMA page(s) used for status updates 101 * from PF and write the initial status. 102 * @VFDI_OP_CLEAR_STATUS_PAGE: Clear the DMA page(s) used for status 103 * updates from PF. 104 */ 105 enum vfdi_op { 106 VFDI_OP_RESPONSE = 0, 107 VFDI_OP_INIT_EVQ = 1, 108 VFDI_OP_INIT_RXQ = 2, 109 VFDI_OP_INIT_TXQ = 3, 110 VFDI_OP_FINI_ALL_QUEUES = 4, 111 VFDI_OP_INSERT_FILTER = 5, 112 VFDI_OP_REMOVE_ALL_FILTERS = 6, 113 VFDI_OP_SET_STATUS_PAGE = 7, 114 VFDI_OP_CLEAR_STATUS_PAGE = 8, 115 VFDI_OP_LIMIT, 116 }; 117 118 /* Response codes for VFDI operations. Other values may be used in future. */ 119 #define VFDI_RC_SUCCESS 0 120 #define VFDI_RC_ENOMEM (-12) 121 #define VFDI_RC_EINVAL (-22) 122 #define VFDI_RC_EOPNOTSUPP (-95) 123 #define VFDI_RC_ETIMEDOUT (-110) 124 125 /** 126 * struct vfdi_req - Request from VF driver to PF driver 127 * @op: Operation code or response indicator, taken from &enum vfdi_op. 128 * @rc: Response code. Set to 0 on success or a negative error code on failure. 129 * @u.init_evq.index: Index of event queue to create. 130 * @u.init_evq.buf_count: Number of 4k buffers backing event queue. 131 * @u.init_evq.addr: Array of length %u.init_evq.buf_count containing DMA 132 * address of each page backing the event queue. 133 * @u.init_rxq.index: Index of receive queue to create. 134 * @u.init_rxq.buf_count: Number of 4k buffers backing receive queue. 135 * @u.init_rxq.evq: Instance of event queue to target receive events at. 136 * @u.init_rxq.label: Label used in receive events. 137 * @u.init_rxq.flags: Unused. 138 * @u.init_rxq.addr: Array of length %u.init_rxq.buf_count containing DMA 139 * address of each page backing the receive queue. 140 * @u.init_txq.index: Index of transmit queue to create. 141 * @u.init_txq.buf_count: Number of 4k buffers backing transmit queue. 142 * @u.init_txq.evq: Instance of event queue to target transmit completion 143 * events at. 144 * @u.init_txq.label: Label used in transmit completion events. 145 * @u.init_txq.flags: Checksum offload flags. 146 * @u.init_txq.addr: Array of length %u.init_txq.buf_count containing DMA 147 * address of each page backing the transmit queue. 148 * @u.mac_filter.rxq: Insert MAC filter at VF local address/VLAN targeting 149 * all traffic at this receive queue. 150 * @u.mac_filter.flags: MAC filter flags. 151 * @u.set_status_page.dma_addr: Base address for the &struct vfdi_status. 152 * This address must be page-aligned and the PF may write up to a 153 * whole page (allowing for extension of the structure). 154 * @u.set_status_page.peer_page_count: Number of additional pages the VF 155 * has provided into which peer addresses may be DMAd. 156 * @u.set_status_page.peer_page_addr: Array of DMA addresses of pages. 157 * If the number of peers exceeds 256, then the VF must provide 158 * additional pages in this array. The PF will then DMA up to 159 * 512 vfdi_endpoint structures into each page. These addresses 160 * must be page-aligned. 161 */ 162 struct vfdi_req { 163 u32 op; 164 u32 reserved1; 165 s32 rc; 166 u32 reserved2; 167 union { 168 struct { 169 u32 index; 170 u32 buf_count; 171 u64 addr[]; 172 } init_evq; 173 struct { 174 u32 index; 175 u32 buf_count; 176 u32 evq; 177 u32 label; 178 u32 flags; 179 #define VFDI_RXQ_FLAG_SCATTER_EN 1 180 u32 reserved; 181 u64 addr[]; 182 } init_rxq; 183 struct { 184 u32 index; 185 u32 buf_count; 186 u32 evq; 187 u32 label; 188 u32 flags; 189 #define VFDI_TXQ_FLAG_IP_CSUM_DIS 1 190 #define VFDI_TXQ_FLAG_TCPUDP_CSUM_DIS 2 191 u32 reserved; 192 u64 addr[]; 193 } init_txq; 194 struct { 195 u32 rxq; 196 u32 flags; 197 #define VFDI_MAC_FILTER_FLAG_RSS 1 198 #define VFDI_MAC_FILTER_FLAG_SCATTER 2 199 } mac_filter; 200 struct { 201 u64 dma_addr; 202 u64 peer_page_count; 203 u64 peer_page_addr[]; 204 } set_status_page; 205 } u; 206 }; 207 208 /** 209 * struct vfdi_status - Status provided by PF driver to VF driver 210 * @generation_start: A generation count DMA'd to VF *before* the 211 * rest of the structure. 212 * @generation_end: A generation count DMA'd to VF *after* the 213 * rest of the structure. 214 * @version: Version of this structure; currently set to 1. Later 215 * versions must either be layout-compatible or only be sent to VFs 216 * that specifically request them. 217 * @length: Total length of this structure including embedded tables 218 * @vi_scale: log2 the number of VIs available on this VF. This quantity 219 * is used by the hardware for register decoding. 220 * @max_tx_channels: The maximum number of transmit queues the VF can use. 221 * @rss_rxq_count: The number of receive queues present in the shared RSS 222 * indirection table. 223 * @peer_count: Total number of peers in the complete peer list. If larger 224 * than ARRAY_SIZE(%peers), then the VF must provide sufficient 225 * additional pages each of which is filled with vfdi_endpoint structures. 226 * @local: The MAC address and outer VLAN tag of *this* VF 227 * @peers: Table of peer addresses. The @tci fields in these structures 228 * are currently unused and must be ignored. Additional peers are 229 * written into any additional pages provided by the VF. 230 * @timer_quantum_ns: Timer quantum (nominal period between timer ticks) 231 * for interrupt moderation timers, in nanoseconds. This member is only 232 * present if @length is sufficiently large. 233 */ 234 struct vfdi_status { 235 u32 generation_start; 236 u32 generation_end; 237 u32 version; 238 u32 length; 239 u8 vi_scale; 240 u8 max_tx_channels; 241 u8 rss_rxq_count; 242 u8 reserved1; 243 u16 peer_count; 244 u16 reserved2; 245 struct vfdi_endpoint local; 246 struct vfdi_endpoint peers[256]; 247 248 /* Members below here extend version 1 of this structure */ 249 u32 timer_quantum_ns; 250 }; 251 252 #endif 253