1 /* QLogic qed NIC Driver
3 * Copyright (c) 2015 QLogic Corporation
5 * This software is available under the terms of the GNU General Public License
6 * (GPL) Version 2, available from the file COPYING in the main directory of
13 #include <linux/types.h>
14 #include <linux/kernel.h>
15 #include <linux/list.h>
16 #include <linux/mutex.h>
17 #include <linux/slab.h>
18 #include <linux/spinlock.h>
19 #include <linux/qed/qed_chain.h>
20 #include <linux/qed/qed_ll2_if.h>
25 #define QED_MAX_NUM_OF_LL2_CONNECTIONS (4)
27 enum qed_ll2_roce_flavor_type {
30 MAX_QED_LL2_ROCE_FLAVOR_TYPE
33 enum qed_ll2_conn_type {
34 QED_LL2_TYPE_RESERVED,
37 QED_LL2_TYPE_ISCSI_OOO,
38 QED_LL2_TYPE_RESERVED2,
40 QED_LL2_TYPE_RESERVED3,
41 MAX_QED_LL2_RX_CONN_TYPE
44 enum qed_ll2_tx_dest {
45 QED_LL2_TX_DEST_NW, /* Light L2 TX Destination to the Network */
46 QED_LL2_TX_DEST_LB, /* Light L2 TX Destination to the Loopback */
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 */
118 enum qed_ll2_conn_type conn_type;
126 u8 rx_vlan_removal_en;
128 enum core_tx_dest tx_dest;
129 enum core_error_handle ai_err_packet_too_big;
130 enum core_error_handle ai_err_no_buf;
132 struct qed_ll2_rx_queue rx_queue;
133 struct qed_ll2_tx_queue tx_queue;
138 * @brief qed_ll2_acquire_connection - allocate resources,
139 * starts rx & tx (if relevant) queues pair. Provides
140 * connecion handler as output parameter.
143 * @param p_params Contain various configuration properties
147 * @param p_connection_handle Output container for LL2 connection's handle
149 * @return 0 on success, failure otherwise
151 int qed_ll2_acquire_connection(struct qed_hwfn *p_hwfn,
152 struct qed_ll2_info *p_params,
155 u8 *p_connection_handle);
158 * @brief qed_ll2_establish_connection - start previously
159 * allocated LL2 queues pair
163 * @param connection_handle LL2 connection's handle obtained from
164 * qed_ll2_require_connection
166 * @return 0 on success, failure otherwise
168 int qed_ll2_establish_connection(struct qed_hwfn *p_hwfn, u8 connection_handle);
171 * @brief qed_ll2_post_rx_buffers - submit buffers to LL2 Rx queue.
174 * @param connection_handle LL2 connection's handle obtained from
175 * qed_ll2_require_connection
176 * @param addr rx (physical address) buffers to submit
178 * @param notify_fw produce corresponding Rx BD immediately
180 * @return 0 on success, failure otherwise
182 int qed_ll2_post_rx_buffer(struct qed_hwfn *p_hwfn,
183 u8 connection_handle,
185 u16 buf_len, void *cookie, u8 notify_fw);
188 * @brief qed_ll2_prepare_tx_packet - request for start Tx BD
189 * to prepare Tx packet submission to FW.
192 * @param connection_handle LL2 connection's handle obtained from
193 * qed_ll2_require_connection
194 * @param num_of_bds a number of requested BD equals a number of
195 * fragments in Tx packet
196 * @param vlan VLAN to insert to packet (if insertion set)
198 * @param l4_hdr_offset_w L4 Header Offset from start of packet
199 * (in words). This is needed if both l4_csum
200 * and ipv6_ext are set
201 * @param e_tx_dest indicates if the packet is to be transmitted via
202 * loopback or to the network
204 * @param first_frag_len
209 * @return 0 on success, failure otherwise
211 int qed_ll2_prepare_tx_packet(struct qed_hwfn *p_hwfn,
212 u8 connection_handle,
217 enum qed_ll2_tx_dest e_tx_dest,
218 enum qed_ll2_roce_flavor_type qed_roce_flavor,
219 dma_addr_t first_frag,
220 u16 first_frag_len, void *cookie, u8 notify_fw);
223 * @brief qed_ll2_release_connection - releases resources
224 * allocated for LL2 connection
227 * @param connection_handle LL2 connection's handle obtained from
228 * qed_ll2_require_connection
230 void qed_ll2_release_connection(struct qed_hwfn *p_hwfn, u8 connection_handle);
233 * @brief qed_ll2_set_fragment_of_tx_packet - provides fragments to fill
234 * Tx BD of BDs requested by
235 * qed_ll2_prepare_tx_packet
238 * @param connection_handle LL2 connection's handle
240 * qed_ll2_require_connection
244 * @return 0 on success, failure otherwise
246 int qed_ll2_set_fragment_of_tx_packet(struct qed_hwfn *p_hwfn,
247 u8 connection_handle,
248 dma_addr_t addr, u16 nbytes);
251 * @brief qed_ll2_terminate_connection - stops Tx/Rx queues
255 * @param connection_handle LL2 connection's handle
257 * qed_ll2_require_connection
259 * @return 0 on success, failure otherwise
261 int qed_ll2_terminate_connection(struct qed_hwfn *p_hwfn, u8 connection_handle);
264 * @brief qed_ll2_get_stats - get LL2 queue's statistics
268 * @param connection_handle LL2 connection's handle obtained from
269 * qed_ll2_require_connection
272 * @return 0 on success, failure otherwise
274 int qed_ll2_get_stats(struct qed_hwfn *p_hwfn,
275 u8 connection_handle, struct qed_ll2_stats *p_stats);
278 * @brief qed_ll2_alloc - Allocates LL2 connections set
282 * @return pointer to alocated qed_ll2_info or NULL
284 struct qed_ll2_info *qed_ll2_alloc(struct qed_hwfn *p_hwfn);
287 * @brief qed_ll2_setup - Inits LL2 connections set
290 * @param p_ll2_connections
293 void qed_ll2_setup(struct qed_hwfn *p_hwfn,
294 struct qed_ll2_info *p_ll2_connections);
297 * @brief qed_ll2_free - Releases LL2 connections set
300 * @param p_ll2_connections
303 void qed_ll2_free(struct qed_hwfn *p_hwfn,
304 struct qed_ll2_info *p_ll2_connections);