1 /**********************************************************************
2  * Author: Cavium, Inc.
3  *
4  * Contact: support@cavium.com
5  *          Please include "LiquidIO" in the subject.
6  *
7  * Copyright (c) 2003-2016 Cavium, Inc.
8  *
9  * This file is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License, Version 2, as
11  * published by the Free Software Foundation.
12  *
13  * This file is distributed in the hope that it will be useful, but
14  * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
16  * NONINFRINGEMENT.  See the GNU General Public License for more
17  * details.
18  **********************************************************************/
19 #include <linux/pci.h>
20 #include <linux/netdevice.h>
21 #include "liquidio_common.h"
22 #include "octeon_droq.h"
23 #include "octeon_iq.h"
24 #include "response_manager.h"
25 #include "octeon_device.h"
26 #include "octeon_nic.h"
27 #include "octeon_main.h"
28 
29 void *
octeon_alloc_soft_command_resp(struct octeon_device * oct,union octeon_instr_64B * cmd,u32 rdatasize)30 octeon_alloc_soft_command_resp(struct octeon_device    *oct,
31 			       union octeon_instr_64B *cmd,
32 			       u32		       rdatasize)
33 {
34 	struct octeon_soft_command *sc;
35 	struct octeon_instr_ih3  *ih3;
36 	struct octeon_instr_ih2  *ih2;
37 	struct octeon_instr_irh *irh;
38 	struct octeon_instr_rdp *rdp;
39 
40 	sc = (struct octeon_soft_command *)
41 		octeon_alloc_soft_command(oct, 0, rdatasize, 0);
42 
43 	if (!sc)
44 		return NULL;
45 
46 	/* Copy existing command structure into the soft command */
47 	memcpy(&sc->cmd, cmd, sizeof(union octeon_instr_64B));
48 
49 	/* Add in the response related fields. Opcode and Param are already
50 	 * there.
51 	 */
52 	if (OCTEON_CN23XX_PF(oct) || OCTEON_CN23XX_VF(oct)) {
53 		ih3      = (struct octeon_instr_ih3 *)&sc->cmd.cmd3.ih3;
54 		rdp     = (struct octeon_instr_rdp *)&sc->cmd.cmd3.rdp;
55 		irh     = (struct octeon_instr_irh *)&sc->cmd.cmd3.irh;
56 		/*pkiih3 + irh + ossp[0] + ossp[1] + rdp + rptr = 40 bytes */
57 		ih3->fsz = LIO_SOFTCMDRESP_IH3;
58 	} else {
59 		ih2      = (struct octeon_instr_ih2 *)&sc->cmd.cmd2.ih2;
60 		rdp     = (struct octeon_instr_rdp *)&sc->cmd.cmd2.rdp;
61 		irh     = (struct octeon_instr_irh *)&sc->cmd.cmd2.irh;
62 		/* irh + ossp[0] + ossp[1] + rdp + rptr = 40 bytes */
63 		ih2->fsz = LIO_SOFTCMDRESP_IH2;
64 	}
65 
66 	irh->rflag = 1; /* a response is required */
67 
68 	rdp->pcie_port = oct->pcie_port;
69 	rdp->rlen      = rdatasize;
70 
71 	*sc->status_word = COMPLETION_WORD_INIT;
72 
73 	if (OCTEON_CN23XX_PF(oct) || OCTEON_CN23XX_VF(oct))
74 		sc->cmd.cmd3.rptr =  sc->dmarptr;
75 	else
76 		sc->cmd.cmd2.rptr =  sc->dmarptr;
77 
78 	sc->expiry_time = jiffies + msecs_to_jiffies(LIO_SC_MAX_TMO_MS);
79 
80 	return sc;
81 }
82 EXPORT_SYMBOL_GPL(octeon_alloc_soft_command_resp);
83 
octnet_send_nic_data_pkt(struct octeon_device * oct,struct octnic_data_pkt * ndata,int xmit_more)84 int octnet_send_nic_data_pkt(struct octeon_device *oct,
85 			     struct octnic_data_pkt *ndata,
86 			     int xmit_more)
87 {
88 	int ring_doorbell = !xmit_more;
89 
90 	return octeon_send_command(oct, ndata->q_no, ring_doorbell, &ndata->cmd,
91 				   ndata->buf, ndata->datasize,
92 				   ndata->reqtype);
93 }
94 EXPORT_SYMBOL_GPL(octnet_send_nic_data_pkt);
95 
96 static inline struct octeon_soft_command
octnic_alloc_ctrl_pkt_sc(struct octeon_device * oct,struct octnic_ctrl_pkt * nctrl)97 *octnic_alloc_ctrl_pkt_sc(struct octeon_device *oct,
98 			  struct octnic_ctrl_pkt *nctrl)
99 {
100 	struct octeon_soft_command *sc = NULL;
101 	u8 *data;
102 	u32 rdatasize;
103 	u32 uddsize = 0, datasize = 0;
104 
105 	uddsize = (u32)(nctrl->ncmd.s.more * 8);
106 
107 	datasize = OCTNET_CMD_SIZE + uddsize;
108 	rdatasize = 16;
109 
110 	sc = (struct octeon_soft_command *)
111 		octeon_alloc_soft_command(oct, datasize, rdatasize, 0);
112 
113 	if (!sc)
114 		return NULL;
115 
116 	data = (u8 *)sc->virtdptr;
117 
118 	memcpy(data, &nctrl->ncmd, OCTNET_CMD_SIZE);
119 
120 	octeon_swap_8B_data((u64 *)data, (OCTNET_CMD_SIZE >> 3));
121 
122 	if (uddsize) {
123 		/* Endian-Swap for UDD should have been done by caller. */
124 		memcpy(data + OCTNET_CMD_SIZE, nctrl->udd, uddsize);
125 	}
126 
127 	sc->iq_no = (u32)nctrl->iq_no;
128 
129 	octeon_prepare_soft_command(oct, sc, OPCODE_NIC, OPCODE_NIC_CMD,
130 				    0, 0, 0);
131 
132 	init_completion(&sc->complete);
133 	sc->sc_status = OCTEON_REQUEST_PENDING;
134 
135 	return sc;
136 }
137 
138 int
octnet_send_nic_ctrl_pkt(struct octeon_device * oct,struct octnic_ctrl_pkt * nctrl)139 octnet_send_nic_ctrl_pkt(struct octeon_device *oct,
140 			 struct octnic_ctrl_pkt *nctrl)
141 {
142 	int retval;
143 	struct octeon_soft_command *sc = NULL;
144 
145 	spin_lock_bh(&oct->cmd_resp_wqlock);
146 	/* Allow only rx ctrl command to stop traffic on the chip
147 	 * during offline operations
148 	 */
149 	if ((oct->cmd_resp_state == OCT_DRV_OFFLINE) &&
150 	    (nctrl->ncmd.s.cmd != OCTNET_CMD_RX_CTL)) {
151 		spin_unlock_bh(&oct->cmd_resp_wqlock);
152 		dev_err(&oct->pci_dev->dev,
153 			"%s cmd:%d not processed since driver offline\n",
154 			__func__, nctrl->ncmd.s.cmd);
155 		return -1;
156 	}
157 
158 	sc = octnic_alloc_ctrl_pkt_sc(oct, nctrl);
159 	if (!sc) {
160 		dev_err(&oct->pci_dev->dev, "%s soft command alloc failed\n",
161 			__func__);
162 		spin_unlock_bh(&oct->cmd_resp_wqlock);
163 		return -1;
164 	}
165 
166 	retval = octeon_send_soft_command(oct, sc);
167 	if (retval == IQ_SEND_FAILED) {
168 		octeon_free_soft_command(oct, sc);
169 		dev_err(&oct->pci_dev->dev, "%s pf_num:%d soft command:%d send failed status: %x\n",
170 			__func__, oct->pf_num, nctrl->ncmd.s.cmd, retval);
171 		spin_unlock_bh(&oct->cmd_resp_wqlock);
172 		return -1;
173 	}
174 
175 	spin_unlock_bh(&oct->cmd_resp_wqlock);
176 
177 	if (nctrl->ncmd.s.cmdgroup == 0) {
178 		switch (nctrl->ncmd.s.cmd) {
179 			/* caller holds lock, can not sleep */
180 		case OCTNET_CMD_CHANGE_DEVFLAGS:
181 		case OCTNET_CMD_SET_MULTI_LIST:
182 		case OCTNET_CMD_SET_UC_LIST:
183 			WRITE_ONCE(sc->caller_is_done, true);
184 			return retval;
185 		}
186 	}
187 
188 	retval = wait_for_sc_completion_timeout(oct, sc, 0);
189 	if (retval)
190 		return (retval);
191 
192 	nctrl->sc_status = sc->sc_status;
193 	retval = nctrl->sc_status;
194 	if (nctrl->cb_fn)
195 		nctrl->cb_fn(nctrl);
196 
197 	WRITE_ONCE(sc->caller_is_done, true);
198 
199 	return retval;
200 }
201 EXPORT_SYMBOL_GPL(octnet_send_nic_ctrl_pkt);
202