1 /* QLogic qed NIC Driver
2 * Copyright (c) 2015-2017 QLogic Corporation
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
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>
48 #define QED_MAX_NUM_OF_LL2_CONNECTIONS (4)
50 struct qed_ll2_rx_packet {
51 struct list_head list_entry;
52 struct core_rx_bd_with_buff_len *rxq_bd;
53 dma_addr_t rx_buf_addr;
63 struct qed_ll2_tx_packet {
64 struct list_head list_entry;
73 struct core_tx_bd *txq_bd;
76 } bds_set[ETH_TX_MAX_BDS_PER_NON_LSO_PACKET];
79 struct qed_ll2_rx_queue {
80 /* Lock protecting the Rx queue manipulation */
82 struct qed_chain rxq_chain;
83 struct qed_chain rcq_chain;
87 struct list_head active_descq;
88 struct list_head free_descq;
89 struct list_head posting_descq;
90 struct qed_ll2_rx_packet *descq_array;
91 void __iomem *set_prod_addr;
94 struct qed_ll2_tx_queue {
95 /* Lock protecting the Tx queue manipulation */
97 struct qed_chain txq_chain;
101 struct list_head active_descq;
102 struct list_head free_descq;
103 struct list_head sending_descq;
104 struct qed_ll2_tx_packet *descq_array;
105 struct qed_ll2_tx_packet *cur_send_packet;
106 struct qed_ll2_tx_packet cur_completing_packet;
107 u16 cur_completing_bd_idx;
108 void __iomem *doorbell_addr;
110 u16 cur_send_frag_num;
111 u16 cur_completing_frag_num;
112 bool b_completing_packet;
115 struct qed_ll2_info {
116 /* Lock protecting the state of LL2 */
119 struct qed_ll2_acquire_data_inputs input;
125 enum core_tx_dest tx_dest;
127 struct qed_ll2_rx_queue rx_queue;
128 struct qed_ll2_tx_queue tx_queue;
129 struct qed_ll2_cbs cbs;
133 * @brief qed_ll2_acquire_connection - allocate resources,
134 * starts rx & tx (if relevant) queues pair. Provides
135 * connecion handler as output parameter.
138 * @param cxt - pointer to the hw-function [opaque to some]
139 * @param data - describes connection parameters
142 int qed_ll2_acquire_connection(void *cxt, struct qed_ll2_acquire_data *data);
145 * @brief qed_ll2_establish_connection - start previously
146 * allocated LL2 queues pair
148 * @param cxt - pointer to the hw-function [opaque to some]
150 * @param connection_handle LL2 connection's handle obtained from
151 * qed_ll2_require_connection
153 * @return 0 on success, failure otherwise
155 int qed_ll2_establish_connection(void *cxt, u8 connection_handle);
158 * @brief qed_ll2_post_rx_buffers - submit buffers to LL2 Rx queue.
160 * @param cxt - pointer to the hw-function [opaque to some]
161 * @param connection_handle LL2 connection's handle obtained from
162 * qed_ll2_require_connection
163 * @param addr rx (physical address) buffers to submit
165 * @param notify_fw produce corresponding Rx BD immediately
167 * @return 0 on success, failure otherwise
169 int qed_ll2_post_rx_buffer(void *cxt,
170 u8 connection_handle,
172 u16 buf_len, void *cookie, u8 notify_fw);
175 * @brief qed_ll2_prepare_tx_packet - request for start Tx BD
176 * to prepare Tx packet submission to FW.
178 * @param cxt - pointer to the hw-function [opaque to some]
179 * @param connection_handle
180 * @param pkt - info regarding the tx packet
181 * @param notify_fw - issue doorbell to fw for this packet
183 * @return 0 on success, failure otherwise
185 int qed_ll2_prepare_tx_packet(void *cxt,
186 u8 connection_handle,
187 struct qed_ll2_tx_pkt_info *pkt,
191 * @brief qed_ll2_release_connection - releases resources
192 * allocated for LL2 connection
194 * @param cxt - pointer to the hw-function [opaque to some]
195 * @param connection_handle LL2 connection's handle obtained from
196 * qed_ll2_require_connection
198 void qed_ll2_release_connection(void *cxt, u8 connection_handle);
201 * @brief qed_ll2_set_fragment_of_tx_packet - provides fragments to fill
202 * Tx BD of BDs requested by
203 * qed_ll2_prepare_tx_packet
205 * @param cxt - pointer to the hw-function [opaque to some]
206 * @param connection_handle LL2 connection's handle
208 * qed_ll2_require_connection
212 * @return 0 on success, failure otherwise
214 int qed_ll2_set_fragment_of_tx_packet(void *cxt,
215 u8 connection_handle,
216 dma_addr_t addr, u16 nbytes);
219 * @brief qed_ll2_terminate_connection - stops Tx/Rx queues
222 * @param cxt - pointer to the hw-function [opaque to some]
223 * @param connection_handle LL2 connection's handle
225 * qed_ll2_require_connection
227 * @return 0 on success, failure otherwise
229 int qed_ll2_terminate_connection(void *cxt, u8 connection_handle);
232 * @brief qed_ll2_get_stats - get LL2 queue's statistics
235 * @param cxt - pointer to the hw-function [opaque to some]
236 * @param connection_handle LL2 connection's handle obtained from
237 * qed_ll2_require_connection
240 * @return 0 on success, failure otherwise
242 int qed_ll2_get_stats(void *cxt,
243 u8 connection_handle, struct qed_ll2_stats *p_stats);
246 * @brief qed_ll2_alloc - Allocates LL2 connections set
252 int qed_ll2_alloc(struct qed_hwfn *p_hwfn);
255 * @brief qed_ll2_setup - Inits LL2 connections set
260 void qed_ll2_setup(struct qed_hwfn *p_hwfn);
263 * @brief qed_ll2_free - Releases LL2 connections set
268 void qed_ll2_free(struct qed_hwfn *p_hwfn);