drivers/net/ethernet/qlogic/qed/qed_ll2.h

   1 /* QLogic qed NIC Driver
   2  * Copyright (c) 2015-2017  QLogic Corporation
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and /or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #ifndef _QED_LL2_H
  34 #define _QED_LL2_H
  35
  36 #include <linux/types.h>
  37 #include <linux/kernel.h>
  38 #include <linux/list.h>
  39 #include <linux/mutex.h>
  40 #include <linux/slab.h>
  41 #include <linux/spinlock.h>
  42 #include <linux/qed/qed_chain.h>
  43 #include <linux/qed/qed_ll2_if.h>
  44 #include "qed.h"
  45 #include "qed_hsi.h"
  46 #include "qed_sp.h"
  47
  48 #define QED_MAX_NUM_OF_LL2_CONNECTIONS                    (4)
  49 /* LL2 queues handles will be split as follows:
  50  * first will be legacy queues, and then the ctx based queues.
  51  */
  52 #define QED_MAX_NUM_OF_LL2_CONNS_PF            (4)
  53 #define QED_MAX_NUM_OF_LEGACY_LL2_CONNS_PF   (3)
  54
  55 #define QED_MAX_NUM_OF_CTX_LL2_CONNS_PF \
  56         (QED_MAX_NUM_OF_LL2_CONNS_PF - QED_MAX_NUM_OF_LEGACY_LL2_CONNS_PF)
  57
  58 #define QED_LL2_LEGACY_CONN_BASE_PF     0
  59 #define QED_LL2_CTX_CONN_BASE_PF        QED_MAX_NUM_OF_LEGACY_LL2_CONNS_PF
  60
  61
  62 struct qed_ll2_rx_packet {
  63         struct list_head list_entry;
  64         struct core_rx_bd_with_buff_len *rxq_bd;
  65         dma_addr_t rx_buf_addr;
  66         u16 buf_length;
  67         void *cookie;
  68         u8 placement_offset;
  69         u16 parse_flags;
  70         u16 packet_length;
  71         u16 vlan;
  72         u32 opaque_data[2];
  73 };
  74
  75 struct qed_ll2_tx_packet {
  76         struct list_head list_entry;
  77         u16 bd_used;
  78         bool notify_fw;
  79         void *cookie;
  80         /* Flexible Array of bds_set determined by max_bds_per_packet */
  81         struct {
  82                 struct core_tx_bd *txq_bd;
  83                 dma_addr_t tx_frag;
  84                 u16 frag_len;
  85         } bds_set[1];
  86 };
  87
  88 struct qed_ll2_rx_queue {
  89         /* Lock protecting the Rx queue manipulation */
  90         spinlock_t lock;
  91         struct qed_chain rxq_chain;
  92         struct qed_chain rcq_chain;
  93         u8 rx_sb_index;
  94         u8 ctx_based;
  95         bool b_cb_registered;
  96         __le16 *p_fw_cons;
  97         struct list_head active_descq;
  98         struct list_head free_descq;
  99         struct list_head posting_descq;
 100         struct qed_ll2_rx_packet *descq_array;
 101         void __iomem *set_prod_addr;
 102         struct core_pwm_prod_update_data db_data;
 103 };
 104
 105 struct qed_ll2_tx_queue {
 106         /* Lock protecting the Tx queue manipulation */
 107         spinlock_t lock;
 108         struct qed_chain txq_chain;
 109         u8 tx_sb_index;
 110         bool b_cb_registered;
 111         __le16 *p_fw_cons;
 112         struct list_head active_descq;
 113         struct list_head free_descq;
 114         struct list_head sending_descq;
 115         void *descq_mem; /* memory for variable sized qed_ll2_tx_packet*/
 116         struct qed_ll2_tx_packet *cur_send_packet;
 117         struct qed_ll2_tx_packet cur_completing_packet;
 118         u16 cur_completing_bd_idx;
 119         void __iomem *doorbell_addr;
 120         struct core_db_data db_msg;
 121         u16 bds_idx;
 122         u16 cur_send_frag_num;
 123         u16 cur_completing_frag_num;
 124         bool b_completing_packet;
 125 };
 126
 127 struct qed_ll2_info {
 128         /* Lock protecting the state of LL2 */
 129         struct mutex mutex;
 130
 131         struct qed_ll2_acquire_data_inputs input;
 132         u32 cid;
 133         u8 my_id;
 134         u8 queue_id;
 135         u8 tx_stats_id;
 136         bool b_active;
 137         enum core_tx_dest tx_dest;
 138         u8 tx_stats_en;
 139         bool main_func_queue;
 140         struct qed_ll2_rx_queue rx_queue;
 141         struct qed_ll2_tx_queue tx_queue;
 142         struct qed_ll2_cbs cbs;
 143 };
 144
 145 /**
 146  * @brief qed_ll2_acquire_connection - allocate resources,
 147  *        starts rx & tx (if relevant) queues pair. Provides
 148  *        connecion handler as output parameter.
 149  *
 150  *
 151  * @param cxt - pointer to the hw-function [opaque to some]
 152  * @param data - describes connection parameters
 153  * @return int
 154  */
 155 int qed_ll2_acquire_connection(void *cxt, struct qed_ll2_acquire_data *data);
 156
 157 /**
 158  * @brief qed_ll2_establish_connection - start previously
 159  *        allocated LL2 queues pair
 160  *
 161  * @param cxt - pointer to the hw-function [opaque to some]
 162  * @param p_ptt
 163  * @param connection_handle     LL2 connection's handle obtained from
 164  *                              qed_ll2_require_connection
 165  *
 166  * @return 0 on success, failure otherwise
 167  */
 168 int qed_ll2_establish_connection(void *cxt, u8 connection_handle);
 169
 170 /**
 171  * @brief qed_ll2_post_rx_buffers - submit buffers to LL2 Rx queue.
 172  *
 173  * @param cxt - pointer to the hw-function [opaque to some]
 174  * @param connection_handle     LL2 connection's handle obtained from
 175  *                              qed_ll2_require_connection
 176  * @param addr                  rx (physical address) buffers to submit
 177  * @param cookie
 178  * @param notify_fw             produce corresponding Rx BD immediately
 179  *
 180  * @return 0 on success, failure otherwise
 181  */
 182 int qed_ll2_post_rx_buffer(void *cxt,
 183                            u8 connection_handle,
 184                            dma_addr_t addr,
 185                            u16 buf_len, void *cookie, u8 notify_fw);
 186
 187 /**
 188  * @brief qed_ll2_prepare_tx_packet - request for start Tx BD
 189  *                                    to prepare Tx packet submission to FW.
 190  *
 191  * @param cxt - pointer to the hw-function [opaque to some]
 192  * @param connection_handle
 193  * @param pkt - info regarding the tx packet
 194  * @param notify_fw - issue doorbell to fw for this packet
 195  *
 196  * @return 0 on success, failure otherwise
 197  */
 198 int qed_ll2_prepare_tx_packet(void *cxt,
 199                               u8 connection_handle,
 200                               struct qed_ll2_tx_pkt_info *pkt,
 201                               bool notify_fw);
 202
 203 /**
 204  * @brief qed_ll2_release_connection -  releases resources
 205  *                                      allocated for LL2 connection
 206  *
 207  * @param cxt - pointer to the hw-function [opaque to some]
 208  * @param connection_handle             LL2 connection's handle obtained from
 209  *                                      qed_ll2_require_connection
 210  */
 211 void qed_ll2_release_connection(void *cxt, u8 connection_handle);
 212
 213 /**
 214  * @brief qed_ll2_set_fragment_of_tx_packet -   provides fragments to fill
 215  *                                              Tx BD of BDs requested by
 216  *                                              qed_ll2_prepare_tx_packet
 217  *
 218  * @param cxt - pointer to the hw-function [opaque to some]
 219  * @param connection_handle                     LL2 connection's handle
 220  *                                              obtained from
 221  *                                              qed_ll2_require_connection
 222  * @param addr
 223  * @param nbytes
 224  *
 225  * @return 0 on success, failure otherwise
 226  */
 227 int qed_ll2_set_fragment_of_tx_packet(void *cxt,
 228                                       u8 connection_handle,
 229                                       dma_addr_t addr, u16 nbytes);
 230
 231 /**
 232  * @brief qed_ll2_terminate_connection -        stops Tx/Rx queues
 233  *
 234  *
 235  * @param cxt - pointer to the hw-function [opaque to some]
 236  * @param connection_handle                     LL2 connection's handle
 237  *                                              obtained from
 238  *                                              qed_ll2_require_connection
 239  *
 240  * @return 0 on success, failure otherwise
 241  */
 242 int qed_ll2_terminate_connection(void *cxt, u8 connection_handle);
 243
 244 /**
 245  * @brief qed_ll2_get_stats -   get LL2 queue's statistics
 246  *
 247  *
 248  * @param cxt - pointer to the hw-function [opaque to some]
 249  * @param connection_handle     LL2 connection's handle obtained from
 250  *                              qed_ll2_require_connection
 251  * @param p_stats
 252  *
 253  * @return 0 on success, failure otherwise
 254  */
 255 int qed_ll2_get_stats(void *cxt,
 256                       u8 connection_handle, struct qed_ll2_stats *p_stats);
 257
 258 /**
 259  * @brief qed_ll2_alloc - Allocates LL2 connections set
 260  *
 261  * @param p_hwfn
 262  *
 263  * @return int
 264  */
 265 int qed_ll2_alloc(struct qed_hwfn *p_hwfn);
 266
 267 /**
 268  * @brief qed_ll2_setup - Inits LL2 connections set
 269  *
 270  * @param p_hwfn
 271  *
 272  */
 273 void qed_ll2_setup(struct qed_hwfn *p_hwfn);
 274
 275 /**
 276  * @brief qed_ll2_free - Releases LL2 connections set
 277  *
 278  * @param p_hwfn
 279  *
 280  */
 281 void qed_ll2_free(struct qed_hwfn *p_hwfn);
 282
 283 #endif