xref: /openbmc/linux/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c (revision 4da722ca)
1 /*
2  * cxgb4i.c: Chelsio T4 iSCSI driver.
3  *
4  * Copyright (c) 2010-2015 Chelsio Communications, Inc.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation.
9  *
10  * Written by:	Karen Xie (kxie@chelsio.com)
11  *		Rakesh Ranjan (rranjan@chelsio.com)
12  */
13 
14 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
15 
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/moduleparam.h>
19 #include <scsi/scsi_host.h>
20 #include <net/tcp.h>
21 #include <net/dst.h>
22 #include <linux/netdevice.h>
23 #include <net/addrconf.h>
24 
25 #include "t4_regs.h"
26 #include "t4_msg.h"
27 #include "cxgb4.h"
28 #include "cxgb4_uld.h"
29 #include "t4fw_api.h"
30 #include "l2t.h"
31 #include "cxgb4i.h"
32 #include "clip_tbl.h"
33 
34 static unsigned int dbg_level;
35 
36 #include "../libcxgbi.h"
37 
38 #define	DRV_MODULE_NAME		"cxgb4i"
39 #define DRV_MODULE_DESC		"Chelsio T4-T6 iSCSI Driver"
40 #define	DRV_MODULE_VERSION	"0.9.5-ko"
41 #define DRV_MODULE_RELDATE	"Apr. 2015"
42 
43 static char version[] =
44 	DRV_MODULE_DESC " " DRV_MODULE_NAME
45 	" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
46 
47 MODULE_AUTHOR("Chelsio Communications, Inc.");
48 MODULE_DESCRIPTION(DRV_MODULE_DESC);
49 MODULE_VERSION(DRV_MODULE_VERSION);
50 MODULE_LICENSE("GPL");
51 
52 module_param(dbg_level, uint, 0644);
53 MODULE_PARM_DESC(dbg_level, "Debug flag (default=0)");
54 
55 #define CXGB4I_DEFAULT_10G_RCV_WIN (256 * 1024)
56 static int cxgb4i_rcv_win = -1;
57 module_param(cxgb4i_rcv_win, int, 0644);
58 MODULE_PARM_DESC(cxgb4i_rcv_win, "TCP reveive window in bytes");
59 
60 #define CXGB4I_DEFAULT_10G_SND_WIN (128 * 1024)
61 static int cxgb4i_snd_win = -1;
62 module_param(cxgb4i_snd_win, int, 0644);
63 MODULE_PARM_DESC(cxgb4i_snd_win, "TCP send window in bytes");
64 
65 static int cxgb4i_rx_credit_thres = 10 * 1024;
66 module_param(cxgb4i_rx_credit_thres, int, 0644);
67 MODULE_PARM_DESC(cxgb4i_rx_credit_thres,
68 		"RX credits return threshold in bytes (default=10KB)");
69 
70 static unsigned int cxgb4i_max_connect = (8 * 1024);
71 module_param(cxgb4i_max_connect, uint, 0644);
72 MODULE_PARM_DESC(cxgb4i_max_connect, "Maximum number of connections");
73 
74 static unsigned short cxgb4i_sport_base = 20000;
75 module_param(cxgb4i_sport_base, ushort, 0644);
76 MODULE_PARM_DESC(cxgb4i_sport_base, "Starting port number (default 20000)");
77 
78 typedef void (*cxgb4i_cplhandler_func)(struct cxgbi_device *, struct sk_buff *);
79 
80 static void *t4_uld_add(const struct cxgb4_lld_info *);
81 static int t4_uld_rx_handler(void *, const __be64 *, const struct pkt_gl *);
82 static int t4_uld_state_change(void *, enum cxgb4_state state);
83 static inline int send_tx_flowc_wr(struct cxgbi_sock *);
84 
85 static const struct cxgb4_uld_info cxgb4i_uld_info = {
86 	.name = DRV_MODULE_NAME,
87 	.nrxq = MAX_ULD_QSETS,
88 	.ntxq = MAX_ULD_QSETS,
89 	.rxq_size = 1024,
90 	.lro = false,
91 	.add = t4_uld_add,
92 	.rx_handler = t4_uld_rx_handler,
93 	.state_change = t4_uld_state_change,
94 };
95 
96 static struct scsi_host_template cxgb4i_host_template = {
97 	.module		= THIS_MODULE,
98 	.name		= DRV_MODULE_NAME,
99 	.proc_name	= DRV_MODULE_NAME,
100 	.can_queue	= CXGB4I_SCSI_HOST_QDEPTH,
101 	.queuecommand	= iscsi_queuecommand,
102 	.change_queue_depth = scsi_change_queue_depth,
103 	.sg_tablesize	= SG_ALL,
104 	.max_sectors	= 0xFFFF,
105 	.cmd_per_lun	= ISCSI_DEF_CMD_PER_LUN,
106 	.eh_timed_out	= iscsi_eh_cmd_timed_out,
107 	.eh_abort_handler = iscsi_eh_abort,
108 	.eh_device_reset_handler = iscsi_eh_device_reset,
109 	.eh_target_reset_handler = iscsi_eh_recover_target,
110 	.target_alloc	= iscsi_target_alloc,
111 	.use_clustering	= DISABLE_CLUSTERING,
112 	.this_id	= -1,
113 	.track_queue_depth = 1,
114 };
115 
116 static struct iscsi_transport cxgb4i_iscsi_transport = {
117 	.owner		= THIS_MODULE,
118 	.name		= DRV_MODULE_NAME,
119 	.caps		= CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST |
120 				CAP_DATADGST | CAP_DIGEST_OFFLOAD |
121 				CAP_PADDING_OFFLOAD | CAP_TEXT_NEGO,
122 	.attr_is_visible	= cxgbi_attr_is_visible,
123 	.get_host_param	= cxgbi_get_host_param,
124 	.set_host_param	= cxgbi_set_host_param,
125 	/* session management */
126 	.create_session	= cxgbi_create_session,
127 	.destroy_session	= cxgbi_destroy_session,
128 	.get_session_param = iscsi_session_get_param,
129 	/* connection management */
130 	.create_conn	= cxgbi_create_conn,
131 	.bind_conn		= cxgbi_bind_conn,
132 	.destroy_conn	= iscsi_tcp_conn_teardown,
133 	.start_conn		= iscsi_conn_start,
134 	.stop_conn		= iscsi_conn_stop,
135 	.get_conn_param	= iscsi_conn_get_param,
136 	.set_param	= cxgbi_set_conn_param,
137 	.get_stats	= cxgbi_get_conn_stats,
138 	/* pdu xmit req from user space */
139 	.send_pdu	= iscsi_conn_send_pdu,
140 	/* task */
141 	.init_task	= iscsi_tcp_task_init,
142 	.xmit_task	= iscsi_tcp_task_xmit,
143 	.cleanup_task	= cxgbi_cleanup_task,
144 	/* pdu */
145 	.alloc_pdu	= cxgbi_conn_alloc_pdu,
146 	.init_pdu	= cxgbi_conn_init_pdu,
147 	.xmit_pdu	= cxgbi_conn_xmit_pdu,
148 	.parse_pdu_itt	= cxgbi_parse_pdu_itt,
149 	/* TCP connect/disconnect */
150 	.get_ep_param	= cxgbi_get_ep_param,
151 	.ep_connect	= cxgbi_ep_connect,
152 	.ep_poll	= cxgbi_ep_poll,
153 	.ep_disconnect	= cxgbi_ep_disconnect,
154 	/* Error recovery timeout call */
155 	.session_recovery_timedout = iscsi_session_recovery_timedout,
156 };
157 
158 static struct scsi_transport_template *cxgb4i_stt;
159 
160 /*
161  * CPL (Chelsio Protocol Language) defines a message passing interface between
162  * the host driver and Chelsio asic.
163  * The section below implments CPLs that related to iscsi tcp connection
164  * open/close/abort and data send/receive.
165  */
166 
167 #define RCV_BUFSIZ_MASK		0x3FFU
168 #define MAX_IMM_TX_PKT_LEN	256
169 
170 static int push_tx_frames(struct cxgbi_sock *, int);
171 
172 /*
173  * is_ofld_imm - check whether a packet can be sent as immediate data
174  * @skb: the packet
175  *
176  * Returns true if a packet can be sent as an offload WR with immediate
177  * data.  We currently use the same limit as for Ethernet packets.
178  */
179 static inline bool is_ofld_imm(const struct sk_buff *skb)
180 {
181 	int len = skb->len;
182 
183 	if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR)))
184 		len += sizeof(struct fw_ofld_tx_data_wr);
185 
186 	return len <= MAX_IMM_TX_PKT_LEN;
187 }
188 
189 static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
190 				struct l2t_entry *e)
191 {
192 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
193 	int wscale = cxgbi_sock_compute_wscale(csk->mss_idx);
194 	unsigned long long opt0;
195 	unsigned int opt2;
196 	unsigned int qid_atid = ((unsigned int)csk->atid) |
197 				 (((unsigned int)csk->rss_qid) << 14);
198 
199 	opt0 = KEEP_ALIVE_F |
200 		WND_SCALE_V(wscale) |
201 		MSS_IDX_V(csk->mss_idx) |
202 		L2T_IDX_V(((struct l2t_entry *)csk->l2t)->idx) |
203 		TX_CHAN_V(csk->tx_chan) |
204 		SMAC_SEL_V(csk->smac_idx) |
205 		ULP_MODE_V(ULP_MODE_ISCSI) |
206 		RCV_BUFSIZ_V(csk->rcv_win >> 10);
207 
208 	opt2 = RX_CHANNEL_V(0) |
209 		RSS_QUEUE_VALID_F |
210 		RSS_QUEUE_V(csk->rss_qid);
211 
212 	if (is_t4(lldi->adapter_type)) {
213 		struct cpl_act_open_req *req =
214 				(struct cpl_act_open_req *)skb->head;
215 
216 		INIT_TP_WR(req, 0);
217 		OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
218 					qid_atid));
219 		req->local_port = csk->saddr.sin_port;
220 		req->peer_port = csk->daddr.sin_port;
221 		req->local_ip = csk->saddr.sin_addr.s_addr;
222 		req->peer_ip = csk->daddr.sin_addr.s_addr;
223 		req->opt0 = cpu_to_be64(opt0);
224 		req->params = cpu_to_be32(cxgb4_select_ntuple(
225 					csk->cdev->ports[csk->port_id],
226 					csk->l2t));
227 		opt2 |= RX_FC_VALID_F;
228 		req->opt2 = cpu_to_be32(opt2);
229 
230 		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
231 			"csk t4 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
232 			csk, &req->local_ip, ntohs(req->local_port),
233 			&req->peer_ip, ntohs(req->peer_port),
234 			csk->atid, csk->rss_qid);
235 	} else if (is_t5(lldi->adapter_type)) {
236 		struct cpl_t5_act_open_req *req =
237 				(struct cpl_t5_act_open_req *)skb->head;
238 		u32 isn = (prandom_u32() & ~7UL) - 1;
239 
240 		INIT_TP_WR(req, 0);
241 		OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
242 					qid_atid));
243 		req->local_port = csk->saddr.sin_port;
244 		req->peer_port = csk->daddr.sin_port;
245 		req->local_ip = csk->saddr.sin_addr.s_addr;
246 		req->peer_ip = csk->daddr.sin_addr.s_addr;
247 		req->opt0 = cpu_to_be64(opt0);
248 		req->params = cpu_to_be64(FILTER_TUPLE_V(
249 				cxgb4_select_ntuple(
250 					csk->cdev->ports[csk->port_id],
251 					csk->l2t)));
252 		req->rsvd = cpu_to_be32(isn);
253 		opt2 |= T5_ISS_VALID;
254 		opt2 |= T5_OPT_2_VALID_F;
255 
256 		req->opt2 = cpu_to_be32(opt2);
257 
258 		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
259 			"csk t5 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
260 			csk, &req->local_ip, ntohs(req->local_port),
261 			&req->peer_ip, ntohs(req->peer_port),
262 			csk->atid, csk->rss_qid);
263 	} else {
264 		struct cpl_t6_act_open_req *req =
265 				(struct cpl_t6_act_open_req *)skb->head;
266 		u32 isn = (prandom_u32() & ~7UL) - 1;
267 
268 		INIT_TP_WR(req, 0);
269 		OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
270 							    qid_atid));
271 		req->local_port = csk->saddr.sin_port;
272 		req->peer_port = csk->daddr.sin_port;
273 		req->local_ip = csk->saddr.sin_addr.s_addr;
274 		req->peer_ip = csk->daddr.sin_addr.s_addr;
275 		req->opt0 = cpu_to_be64(opt0);
276 		req->params = cpu_to_be64(FILTER_TUPLE_V(
277 				cxgb4_select_ntuple(
278 					csk->cdev->ports[csk->port_id],
279 					csk->l2t)));
280 		req->rsvd = cpu_to_be32(isn);
281 
282 		opt2 |= T5_ISS_VALID;
283 		opt2 |= RX_FC_DISABLE_F;
284 		opt2 |= T5_OPT_2_VALID_F;
285 
286 		req->opt2 = cpu_to_be32(opt2);
287 		req->rsvd2 = cpu_to_be32(0);
288 		req->opt3 = cpu_to_be32(0);
289 
290 		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
291 			  "csk t6 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
292 			  csk, &req->local_ip, ntohs(req->local_port),
293 			  &req->peer_ip, ntohs(req->peer_port),
294 			  csk->atid, csk->rss_qid);
295 	}
296 
297 	set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id);
298 
299 	pr_info_ipaddr("t%d csk 0x%p,%u,0x%lx,%u, rss_qid %u.\n",
300 		       (&csk->saddr), (&csk->daddr),
301 		       CHELSIO_CHIP_VERSION(lldi->adapter_type), csk,
302 		       csk->state, csk->flags, csk->atid, csk->rss_qid);
303 
304 	cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
305 }
306 
307 #if IS_ENABLED(CONFIG_IPV6)
308 static void send_act_open_req6(struct cxgbi_sock *csk, struct sk_buff *skb,
309 			       struct l2t_entry *e)
310 {
311 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
312 	int wscale = cxgbi_sock_compute_wscale(csk->mss_idx);
313 	unsigned long long opt0;
314 	unsigned int opt2;
315 	unsigned int qid_atid = ((unsigned int)csk->atid) |
316 				 (((unsigned int)csk->rss_qid) << 14);
317 
318 	opt0 = KEEP_ALIVE_F |
319 		WND_SCALE_V(wscale) |
320 		MSS_IDX_V(csk->mss_idx) |
321 		L2T_IDX_V(((struct l2t_entry *)csk->l2t)->idx) |
322 		TX_CHAN_V(csk->tx_chan) |
323 		SMAC_SEL_V(csk->smac_idx) |
324 		ULP_MODE_V(ULP_MODE_ISCSI) |
325 		RCV_BUFSIZ_V(csk->rcv_win >> 10);
326 
327 	opt2 = RX_CHANNEL_V(0) |
328 		RSS_QUEUE_VALID_F |
329 		RSS_QUEUE_V(csk->rss_qid);
330 
331 	if (is_t4(lldi->adapter_type)) {
332 		struct cpl_act_open_req6 *req =
333 			    (struct cpl_act_open_req6 *)skb->head;
334 
335 		INIT_TP_WR(req, 0);
336 		OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
337 							    qid_atid));
338 		req->local_port = csk->saddr6.sin6_port;
339 		req->peer_port = csk->daddr6.sin6_port;
340 
341 		req->local_ip_hi = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr);
342 		req->local_ip_lo = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr +
343 								    8);
344 		req->peer_ip_hi = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr);
345 		req->peer_ip_lo = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr +
346 								    8);
347 
348 		req->opt0 = cpu_to_be64(opt0);
349 
350 		opt2 |= RX_FC_VALID_F;
351 		req->opt2 = cpu_to_be32(opt2);
352 
353 		req->params = cpu_to_be32(cxgb4_select_ntuple(
354 					  csk->cdev->ports[csk->port_id],
355 					  csk->l2t));
356 	} else if (is_t5(lldi->adapter_type)) {
357 		struct cpl_t5_act_open_req6 *req =
358 				(struct cpl_t5_act_open_req6 *)skb->head;
359 
360 		INIT_TP_WR(req, 0);
361 		OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
362 							    qid_atid));
363 		req->local_port = csk->saddr6.sin6_port;
364 		req->peer_port = csk->daddr6.sin6_port;
365 		req->local_ip_hi = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr);
366 		req->local_ip_lo = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr +
367 									8);
368 		req->peer_ip_hi = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr);
369 		req->peer_ip_lo = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr +
370 									8);
371 		req->opt0 = cpu_to_be64(opt0);
372 
373 		opt2 |= T5_OPT_2_VALID_F;
374 		req->opt2 = cpu_to_be32(opt2);
375 
376 		req->params = cpu_to_be64(FILTER_TUPLE_V(cxgb4_select_ntuple(
377 					  csk->cdev->ports[csk->port_id],
378 					  csk->l2t)));
379 	} else {
380 		struct cpl_t6_act_open_req6 *req =
381 				(struct cpl_t6_act_open_req6 *)skb->head;
382 
383 		INIT_TP_WR(req, 0);
384 		OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
385 							    qid_atid));
386 		req->local_port = csk->saddr6.sin6_port;
387 		req->peer_port = csk->daddr6.sin6_port;
388 		req->local_ip_hi = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr);
389 		req->local_ip_lo = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr +
390 									8);
391 		req->peer_ip_hi = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr);
392 		req->peer_ip_lo = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr +
393 									8);
394 		req->opt0 = cpu_to_be64(opt0);
395 
396 		opt2 |= RX_FC_DISABLE_F;
397 		opt2 |= T5_OPT_2_VALID_F;
398 
399 		req->opt2 = cpu_to_be32(opt2);
400 
401 		req->params = cpu_to_be64(FILTER_TUPLE_V(cxgb4_select_ntuple(
402 					  csk->cdev->ports[csk->port_id],
403 					  csk->l2t)));
404 
405 		req->rsvd2 = cpu_to_be32(0);
406 		req->opt3 = cpu_to_be32(0);
407 	}
408 
409 	set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id);
410 
411 	pr_info("t%d csk 0x%p,%u,0x%lx,%u, [%pI6]:%u-[%pI6]:%u, rss_qid %u.\n",
412 		CHELSIO_CHIP_VERSION(lldi->adapter_type), csk, csk->state,
413 		csk->flags, csk->atid,
414 		&csk->saddr6.sin6_addr, ntohs(csk->saddr.sin_port),
415 		&csk->daddr6.sin6_addr, ntohs(csk->daddr.sin_port),
416 		csk->rss_qid);
417 
418 	cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
419 }
420 #endif
421 
422 static void send_close_req(struct cxgbi_sock *csk)
423 {
424 	struct sk_buff *skb = csk->cpl_close;
425 	struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
426 	unsigned int tid = csk->tid;
427 
428 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
429 		"csk 0x%p,%u,0x%lx, tid %u.\n",
430 		csk, csk->state, csk->flags, csk->tid);
431 	csk->cpl_close = NULL;
432 	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
433 	INIT_TP_WR(req, tid);
434 	OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
435 	req->rsvd = 0;
436 
437 	cxgbi_sock_skb_entail(csk, skb);
438 	if (csk->state >= CTP_ESTABLISHED)
439 		push_tx_frames(csk, 1);
440 }
441 
442 static void abort_arp_failure(void *handle, struct sk_buff *skb)
443 {
444 	struct cxgbi_sock *csk = (struct cxgbi_sock *)handle;
445 	struct cpl_abort_req *req;
446 
447 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
448 		"csk 0x%p,%u,0x%lx, tid %u, abort.\n",
449 		csk, csk->state, csk->flags, csk->tid);
450 	req = (struct cpl_abort_req *)skb->data;
451 	req->cmd = CPL_ABORT_NO_RST;
452 	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
453 }
454 
455 static void send_abort_req(struct cxgbi_sock *csk)
456 {
457 	struct cpl_abort_req *req;
458 	struct sk_buff *skb = csk->cpl_abort_req;
459 
460 	if (unlikely(csk->state == CTP_ABORTING) || !skb || !csk->cdev)
461 		return;
462 
463 	if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
464 		send_tx_flowc_wr(csk);
465 		cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
466 	}
467 
468 	cxgbi_sock_set_state(csk, CTP_ABORTING);
469 	cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
470 	cxgbi_sock_purge_write_queue(csk);
471 
472 	csk->cpl_abort_req = NULL;
473 	req = (struct cpl_abort_req *)skb->head;
474 	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
475 	req->cmd = CPL_ABORT_SEND_RST;
476 	t4_set_arp_err_handler(skb, csk, abort_arp_failure);
477 	INIT_TP_WR(req, csk->tid);
478 	OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
479 	req->rsvd0 = htonl(csk->snd_nxt);
480 	req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
481 
482 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
483 		"csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
484 		csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
485 		req->rsvd1);
486 
487 	cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
488 }
489 
490 static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
491 {
492 	struct sk_buff *skb = csk->cpl_abort_rpl;
493 	struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
494 
495 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
496 		"csk 0x%p,%u,0x%lx,%u, status %d.\n",
497 		csk, csk->state, csk->flags, csk->tid, rst_status);
498 
499 	csk->cpl_abort_rpl = NULL;
500 	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
501 	INIT_TP_WR(rpl, csk->tid);
502 	OPCODE_TID(rpl) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
503 	rpl->cmd = rst_status;
504 	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
505 }
506 
507 /*
508  * CPL connection rx data ack: host ->
509  * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
510  * credits sent.
511  */
512 static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
513 {
514 	struct sk_buff *skb;
515 	struct cpl_rx_data_ack *req;
516 
517 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
518 		"csk 0x%p,%u,0x%lx,%u, credit %u.\n",
519 		csk, csk->state, csk->flags, csk->tid, credits);
520 
521 	skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
522 	if (!skb) {
523 		pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
524 		return 0;
525 	}
526 	req = (struct cpl_rx_data_ack *)skb->head;
527 
528 	set_wr_txq(skb, CPL_PRIORITY_ACK, csk->port_id);
529 	INIT_TP_WR(req, csk->tid);
530 	OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
531 				      csk->tid));
532 	req->credit_dack = cpu_to_be32(RX_CREDITS_V(credits)
533 				       | RX_FORCE_ACK_F);
534 	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
535 	return credits;
536 }
537 
538 /*
539  * sgl_len - calculates the size of an SGL of the given capacity
540  * @n: the number of SGL entries
541  * Calculates the number of flits needed for a scatter/gather list that
542  * can hold the given number of entries.
543  */
544 static inline unsigned int sgl_len(unsigned int n)
545 {
546 	n--;
547 	return (3 * n) / 2 + (n & 1) + 2;
548 }
549 
550 /*
551  * calc_tx_flits_ofld - calculate # of flits for an offload packet
552  * @skb: the packet
553  *
554  * Returns the number of flits needed for the given offload packet.
555  * These packets are already fully constructed and no additional headers
556  * will be added.
557  */
558 static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb)
559 {
560 	unsigned int flits, cnt;
561 
562 	if (is_ofld_imm(skb))
563 		return DIV_ROUND_UP(skb->len, 8);
564 	flits = skb_transport_offset(skb) / 8;
565 	cnt = skb_shinfo(skb)->nr_frags;
566 	if (skb_tail_pointer(skb) != skb_transport_header(skb))
567 		cnt++;
568 	return flits + sgl_len(cnt);
569 }
570 
571 #define FLOWC_WR_NPARAMS_MIN	9
572 static inline int tx_flowc_wr_credits(int *nparamsp, int *flowclenp)
573 {
574 	int nparams, flowclen16, flowclen;
575 
576 	nparams = FLOWC_WR_NPARAMS_MIN;
577 	flowclen = offsetof(struct fw_flowc_wr, mnemval[nparams]);
578 	flowclen16 = DIV_ROUND_UP(flowclen, 16);
579 	flowclen = flowclen16 * 16;
580 	/*
581 	 * Return the number of 16-byte credits used by the FlowC request.
582 	 * Pass back the nparams and actual FlowC length if requested.
583 	 */
584 	if (nparamsp)
585 		*nparamsp = nparams;
586 	if (flowclenp)
587 		*flowclenp = flowclen;
588 
589 	return flowclen16;
590 }
591 
592 static inline int send_tx_flowc_wr(struct cxgbi_sock *csk)
593 {
594 	struct sk_buff *skb;
595 	struct fw_flowc_wr *flowc;
596 	int nparams, flowclen16, flowclen;
597 
598 	flowclen16 = tx_flowc_wr_credits(&nparams, &flowclen);
599 	skb = alloc_wr(flowclen, 0, GFP_ATOMIC);
600 	flowc = (struct fw_flowc_wr *)skb->head;
601 	flowc->op_to_nparams =
602 		htonl(FW_WR_OP_V(FW_FLOWC_WR) | FW_FLOWC_WR_NPARAMS_V(nparams));
603 	flowc->flowid_len16 =
604 		htonl(FW_WR_LEN16_V(flowclen16) | FW_WR_FLOWID_V(csk->tid));
605 	flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
606 	flowc->mnemval[0].val = htonl(csk->cdev->pfvf);
607 	flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
608 	flowc->mnemval[1].val = htonl(csk->tx_chan);
609 	flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
610 	flowc->mnemval[2].val = htonl(csk->tx_chan);
611 	flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
612 	flowc->mnemval[3].val = htonl(csk->rss_qid);
613 	flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
614 	flowc->mnemval[4].val = htonl(csk->snd_nxt);
615 	flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
616 	flowc->mnemval[5].val = htonl(csk->rcv_nxt);
617 	flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
618 	flowc->mnemval[6].val = htonl(csk->snd_win);
619 	flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
620 	flowc->mnemval[7].val = htonl(csk->advmss);
621 	flowc->mnemval[8].mnemonic = 0;
622 	flowc->mnemval[8].val = 0;
623 	flowc->mnemval[8].mnemonic = FW_FLOWC_MNEM_TXDATAPLEN_MAX;
624 	flowc->mnemval[8].val = 16384;
625 
626 	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
627 
628 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
629 		"csk 0x%p, tid 0x%x, %u,%u,%u,%u,%u,%u,%u.\n",
630 		csk, csk->tid, 0, csk->tx_chan, csk->rss_qid,
631 		csk->snd_nxt, csk->rcv_nxt, csk->snd_win,
632 		csk->advmss);
633 
634 	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
635 
636 	return flowclen16;
637 }
638 
639 static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
640 				   int dlen, int len, u32 credits, int compl)
641 {
642 	struct fw_ofld_tx_data_wr *req;
643 	unsigned int submode = cxgbi_skcb_ulp_mode(skb) & 3;
644 	unsigned int wr_ulp_mode = 0, val;
645 	bool imm = is_ofld_imm(skb);
646 
647 	req = __skb_push(skb, sizeof(*req));
648 
649 	if (imm) {
650 		req->op_to_immdlen = htonl(FW_WR_OP_V(FW_OFLD_TX_DATA_WR) |
651 					FW_WR_COMPL_F |
652 					FW_WR_IMMDLEN_V(dlen));
653 		req->flowid_len16 = htonl(FW_WR_FLOWID_V(csk->tid) |
654 						FW_WR_LEN16_V(credits));
655 	} else {
656 		req->op_to_immdlen =
657 			cpu_to_be32(FW_WR_OP_V(FW_OFLD_TX_DATA_WR) |
658 					FW_WR_COMPL_F |
659 					FW_WR_IMMDLEN_V(0));
660 		req->flowid_len16 =
661 			cpu_to_be32(FW_WR_FLOWID_V(csk->tid) |
662 					FW_WR_LEN16_V(credits));
663 	}
664 	if (submode)
665 		wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE_V(ULP2_MODE_ISCSI) |
666 				FW_OFLD_TX_DATA_WR_ULPSUBMODE_V(submode);
667 	val = skb_peek(&csk->write_queue) ? 0 : 1;
668 	req->tunnel_to_proxy = htonl(wr_ulp_mode |
669 				     FW_OFLD_TX_DATA_WR_SHOVE_V(val));
670 	req->plen = htonl(len);
671 	if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT))
672 		cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
673 }
674 
675 static void arp_failure_skb_discard(void *handle, struct sk_buff *skb)
676 {
677 	kfree_skb(skb);
678 }
679 
680 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
681 {
682 	int total_size = 0;
683 	struct sk_buff *skb;
684 
685 	if (unlikely(csk->state < CTP_ESTABLISHED ||
686 		csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
687 		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK |
688 			 1 << CXGBI_DBG_PDU_TX,
689 			"csk 0x%p,%u,0x%lx,%u, in closing state.\n",
690 			csk, csk->state, csk->flags, csk->tid);
691 		return 0;
692 	}
693 
694 	while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
695 		int dlen = skb->len;
696 		int len = skb->len;
697 		unsigned int credits_needed;
698 		int flowclen16 = 0;
699 
700 		skb_reset_transport_header(skb);
701 		if (is_ofld_imm(skb))
702 			credits_needed = DIV_ROUND_UP(dlen, 16);
703 		else
704 			credits_needed = DIV_ROUND_UP(
705 						8 * calc_tx_flits_ofld(skb),
706 						16);
707 
708 		if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR)))
709 			credits_needed += DIV_ROUND_UP(
710 					sizeof(struct fw_ofld_tx_data_wr),
711 					16);
712 
713 		/*
714 		 * Assumes the initial credits is large enough to support
715 		 * fw_flowc_wr plus largest possible first payload
716 		 */
717 		if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
718 			flowclen16 = send_tx_flowc_wr(csk);
719 			csk->wr_cred -= flowclen16;
720 			csk->wr_una_cred += flowclen16;
721 			cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
722 		}
723 
724 		if (csk->wr_cred < credits_needed) {
725 			log_debug(1 << CXGBI_DBG_PDU_TX,
726 				"csk 0x%p, skb %u/%u, wr %d < %u.\n",
727 				csk, skb->len, skb->data_len,
728 				credits_needed, csk->wr_cred);
729 			break;
730 		}
731 		__skb_unlink(skb, &csk->write_queue);
732 		set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
733 		skb->csum = credits_needed + flowclen16;
734 		csk->wr_cred -= credits_needed;
735 		csk->wr_una_cred += credits_needed;
736 		cxgbi_sock_enqueue_wr(csk, skb);
737 
738 		log_debug(1 << CXGBI_DBG_PDU_TX,
739 			"csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n",
740 			csk, skb->len, skb->data_len, credits_needed,
741 			csk->wr_cred, csk->wr_una_cred);
742 
743 		if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
744 			len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
745 			make_tx_data_wr(csk, skb, dlen, len, credits_needed,
746 					req_completion);
747 			csk->snd_nxt += len;
748 			cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
749 		} else if (cxgbi_skcb_test_flag(skb, SKCBF_TX_FLAG_COMPL) &&
750 			   (csk->wr_una_cred >= (csk->wr_max_cred / 2))) {
751 			struct cpl_close_con_req *req =
752 				(struct cpl_close_con_req *)skb->data;
753 			req->wr.wr_hi |= htonl(FW_WR_COMPL_F);
754 		}
755 		total_size += skb->truesize;
756 		t4_set_arp_err_handler(skb, csk, arp_failure_skb_discard);
757 
758 		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
759 			"csk 0x%p,%u,0x%lx,%u, skb 0x%p, %u.\n",
760 			csk, csk->state, csk->flags, csk->tid, skb, len);
761 
762 		cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
763 	}
764 	return total_size;
765 }
766 
767 static inline void free_atid(struct cxgbi_sock *csk)
768 {
769 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
770 
771 	if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
772 		cxgb4_free_atid(lldi->tids, csk->atid);
773 		cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
774 		cxgbi_sock_put(csk);
775 	}
776 }
777 
778 static void do_act_establish(struct cxgbi_device *cdev, struct sk_buff *skb)
779 {
780 	struct cxgbi_sock *csk;
781 	struct cpl_act_establish *req = (struct cpl_act_establish *)skb->data;
782 	unsigned short tcp_opt = ntohs(req->tcp_opt);
783 	unsigned int tid = GET_TID(req);
784 	unsigned int atid = TID_TID_G(ntohl(req->tos_atid));
785 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
786 	struct tid_info *t = lldi->tids;
787 	u32 rcv_isn = be32_to_cpu(req->rcv_isn);
788 
789 	csk = lookup_atid(t, atid);
790 	if (unlikely(!csk)) {
791 		pr_err("NO conn. for atid %u, cdev 0x%p.\n", atid, cdev);
792 		goto rel_skb;
793 	}
794 
795 	if (csk->atid != atid) {
796 		pr_err("bad conn atid %u, csk 0x%p,%u,0x%lx,tid %u, atid %u.\n",
797 			atid, csk, csk->state, csk->flags, csk->tid, csk->atid);
798 		goto rel_skb;
799 	}
800 
801 	pr_info_ipaddr("atid 0x%x, tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
802 		       (&csk->saddr), (&csk->daddr),
803 		       atid, tid, csk, csk->state, csk->flags, rcv_isn);
804 
805 	module_put(cdev->owner);
806 
807 	cxgbi_sock_get(csk);
808 	csk->tid = tid;
809 	cxgb4_insert_tid(lldi->tids, csk, tid, csk->csk_family);
810 	cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
811 
812 	free_atid(csk);
813 
814 	spin_lock_bh(&csk->lock);
815 	if (unlikely(csk->state != CTP_ACTIVE_OPEN))
816 		pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
817 			csk, csk->state, csk->flags, csk->tid);
818 
819 	if (csk->retry_timer.function) {
820 		del_timer(&csk->retry_timer);
821 		csk->retry_timer.function = NULL;
822 	}
823 
824 	csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
825 	/*
826 	 * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
827 	 * pass through opt0.
828 	 */
829 	if (csk->rcv_win > (RCV_BUFSIZ_MASK << 10))
830 		csk->rcv_wup -= csk->rcv_win - (RCV_BUFSIZ_MASK << 10);
831 
832 	csk->advmss = lldi->mtus[TCPOPT_MSS_G(tcp_opt)] - 40;
833 	if (TCPOPT_TSTAMP_G(tcp_opt))
834 		csk->advmss -= 12;
835 	if (csk->advmss < 128)
836 		csk->advmss = 128;
837 
838 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
839 		"csk 0x%p, mss_idx %u, advmss %u.\n",
840 			csk, TCPOPT_MSS_G(tcp_opt), csk->advmss);
841 
842 	cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
843 
844 	if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
845 		send_abort_req(csk);
846 	else {
847 		if (skb_queue_len(&csk->write_queue))
848 			push_tx_frames(csk, 0);
849 		cxgbi_conn_tx_open(csk);
850 	}
851 	spin_unlock_bh(&csk->lock);
852 
853 rel_skb:
854 	__kfree_skb(skb);
855 }
856 
857 static int act_open_rpl_status_to_errno(int status)
858 {
859 	switch (status) {
860 	case CPL_ERR_CONN_RESET:
861 		return -ECONNREFUSED;
862 	case CPL_ERR_ARP_MISS:
863 		return -EHOSTUNREACH;
864 	case CPL_ERR_CONN_TIMEDOUT:
865 		return -ETIMEDOUT;
866 	case CPL_ERR_TCAM_FULL:
867 		return -ENOMEM;
868 	case CPL_ERR_CONN_EXIST:
869 		return -EADDRINUSE;
870 	default:
871 		return -EIO;
872 	}
873 }
874 
875 static void csk_act_open_retry_timer(unsigned long data)
876 {
877 	struct sk_buff *skb = NULL;
878 	struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
879 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
880 	void (*send_act_open_func)(struct cxgbi_sock *, struct sk_buff *,
881 				   struct l2t_entry *);
882 	int t4 = is_t4(lldi->adapter_type), size, size6;
883 
884 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
885 		"csk 0x%p,%u,0x%lx,%u.\n",
886 		csk, csk->state, csk->flags, csk->tid);
887 
888 	cxgbi_sock_get(csk);
889 	spin_lock_bh(&csk->lock);
890 
891 	if (t4) {
892 		size = sizeof(struct cpl_act_open_req);
893 		size6 = sizeof(struct cpl_act_open_req6);
894 	} else {
895 		size = sizeof(struct cpl_t5_act_open_req);
896 		size6 = sizeof(struct cpl_t5_act_open_req6);
897 	}
898 
899 	if (csk->csk_family == AF_INET) {
900 		send_act_open_func = send_act_open_req;
901 		skb = alloc_wr(size, 0, GFP_ATOMIC);
902 #if IS_ENABLED(CONFIG_IPV6)
903 	} else {
904 		send_act_open_func = send_act_open_req6;
905 		skb = alloc_wr(size6, 0, GFP_ATOMIC);
906 #endif
907 	}
908 
909 	if (!skb)
910 		cxgbi_sock_fail_act_open(csk, -ENOMEM);
911 	else {
912 		skb->sk = (struct sock *)csk;
913 		t4_set_arp_err_handler(skb, csk,
914 				       cxgbi_sock_act_open_req_arp_failure);
915 		send_act_open_func(csk, skb, csk->l2t);
916 	}
917 
918 	spin_unlock_bh(&csk->lock);
919 	cxgbi_sock_put(csk);
920 
921 }
922 
923 static inline bool is_neg_adv(unsigned int status)
924 {
925 	return status == CPL_ERR_RTX_NEG_ADVICE ||
926 		status == CPL_ERR_KEEPALV_NEG_ADVICE ||
927 		status == CPL_ERR_PERSIST_NEG_ADVICE;
928 }
929 
930 static void do_act_open_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
931 {
932 	struct cxgbi_sock *csk;
933 	struct cpl_act_open_rpl *rpl = (struct cpl_act_open_rpl *)skb->data;
934 	unsigned int tid = GET_TID(rpl);
935 	unsigned int atid =
936 		TID_TID_G(AOPEN_ATID_G(be32_to_cpu(rpl->atid_status)));
937 	unsigned int status = AOPEN_STATUS_G(be32_to_cpu(rpl->atid_status));
938 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
939 	struct tid_info *t = lldi->tids;
940 
941 	csk = lookup_atid(t, atid);
942 	if (unlikely(!csk)) {
943 		pr_err("NO matching conn. atid %u, tid %u.\n", atid, tid);
944 		goto rel_skb;
945 	}
946 
947 	pr_info_ipaddr("tid %u/%u, status %u.\n"
948 		       "csk 0x%p,%u,0x%lx. ", (&csk->saddr), (&csk->daddr),
949 		       atid, tid, status, csk, csk->state, csk->flags);
950 
951 	if (is_neg_adv(status))
952 		goto rel_skb;
953 
954 	module_put(cdev->owner);
955 
956 	if (status && status != CPL_ERR_TCAM_FULL &&
957 	    status != CPL_ERR_CONN_EXIST &&
958 	    status != CPL_ERR_ARP_MISS)
959 		cxgb4_remove_tid(lldi->tids, csk->port_id, GET_TID(rpl),
960 				 csk->csk_family);
961 
962 	cxgbi_sock_get(csk);
963 	spin_lock_bh(&csk->lock);
964 
965 	if (status == CPL_ERR_CONN_EXIST &&
966 	    csk->retry_timer.function != csk_act_open_retry_timer) {
967 		csk->retry_timer.function = csk_act_open_retry_timer;
968 		mod_timer(&csk->retry_timer, jiffies + HZ / 2);
969 	} else
970 		cxgbi_sock_fail_act_open(csk,
971 					act_open_rpl_status_to_errno(status));
972 
973 	spin_unlock_bh(&csk->lock);
974 	cxgbi_sock_put(csk);
975 rel_skb:
976 	__kfree_skb(skb);
977 }
978 
979 static void do_peer_close(struct cxgbi_device *cdev, struct sk_buff *skb)
980 {
981 	struct cxgbi_sock *csk;
982 	struct cpl_peer_close *req = (struct cpl_peer_close *)skb->data;
983 	unsigned int tid = GET_TID(req);
984 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
985 	struct tid_info *t = lldi->tids;
986 
987 	csk = lookup_tid(t, tid);
988 	if (unlikely(!csk)) {
989 		pr_err("can't find connection for tid %u.\n", tid);
990 		goto rel_skb;
991 	}
992 	pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u.\n",
993 		       (&csk->saddr), (&csk->daddr),
994 		       csk, csk->state, csk->flags, csk->tid);
995 	cxgbi_sock_rcv_peer_close(csk);
996 rel_skb:
997 	__kfree_skb(skb);
998 }
999 
1000 static void do_close_con_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
1001 {
1002 	struct cxgbi_sock *csk;
1003 	struct cpl_close_con_rpl *rpl = (struct cpl_close_con_rpl *)skb->data;
1004 	unsigned int tid = GET_TID(rpl);
1005 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1006 	struct tid_info *t = lldi->tids;
1007 
1008 	csk = lookup_tid(t, tid);
1009 	if (unlikely(!csk)) {
1010 		pr_err("can't find connection for tid %u.\n", tid);
1011 		goto rel_skb;
1012 	}
1013 	pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u.\n",
1014 		       (&csk->saddr), (&csk->daddr),
1015 		       csk, csk->state, csk->flags, csk->tid);
1016 	cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
1017 rel_skb:
1018 	__kfree_skb(skb);
1019 }
1020 
1021 static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
1022 								int *need_rst)
1023 {
1024 	switch (abort_reason) {
1025 	case CPL_ERR_BAD_SYN: /* fall through */
1026 	case CPL_ERR_CONN_RESET:
1027 		return csk->state > CTP_ESTABLISHED ?
1028 			-EPIPE : -ECONNRESET;
1029 	case CPL_ERR_XMIT_TIMEDOUT:
1030 	case CPL_ERR_PERSIST_TIMEDOUT:
1031 	case CPL_ERR_FINWAIT2_TIMEDOUT:
1032 	case CPL_ERR_KEEPALIVE_TIMEDOUT:
1033 		return -ETIMEDOUT;
1034 	default:
1035 		return -EIO;
1036 	}
1037 }
1038 
1039 static void do_abort_req_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
1040 {
1041 	struct cxgbi_sock *csk;
1042 	struct cpl_abort_req_rss *req = (struct cpl_abort_req_rss *)skb->data;
1043 	unsigned int tid = GET_TID(req);
1044 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1045 	struct tid_info *t = lldi->tids;
1046 	int rst_status = CPL_ABORT_NO_RST;
1047 
1048 	csk = lookup_tid(t, tid);
1049 	if (unlikely(!csk)) {
1050 		pr_err("can't find connection for tid %u.\n", tid);
1051 		goto rel_skb;
1052 	}
1053 
1054 	pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u, status %u.\n",
1055 		       (&csk->saddr), (&csk->daddr),
1056 		       csk, csk->state, csk->flags, csk->tid, req->status);
1057 
1058 	if (is_neg_adv(req->status))
1059 		goto rel_skb;
1060 
1061 	cxgbi_sock_get(csk);
1062 	spin_lock_bh(&csk->lock);
1063 
1064 	cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
1065 
1066 	if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
1067 		send_tx_flowc_wr(csk);
1068 		cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
1069 	}
1070 
1071 	cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
1072 	cxgbi_sock_set_state(csk, CTP_ABORTING);
1073 
1074 	send_abort_rpl(csk, rst_status);
1075 
1076 	if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
1077 		csk->err = abort_status_to_errno(csk, req->status, &rst_status);
1078 		cxgbi_sock_closed(csk);
1079 	}
1080 
1081 	spin_unlock_bh(&csk->lock);
1082 	cxgbi_sock_put(csk);
1083 rel_skb:
1084 	__kfree_skb(skb);
1085 }
1086 
1087 static void do_abort_rpl_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
1088 {
1089 	struct cxgbi_sock *csk;
1090 	struct cpl_abort_rpl_rss *rpl = (struct cpl_abort_rpl_rss *)skb->data;
1091 	unsigned int tid = GET_TID(rpl);
1092 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1093 	struct tid_info *t = lldi->tids;
1094 
1095 	csk = lookup_tid(t, tid);
1096 	if (!csk)
1097 		goto rel_skb;
1098 
1099 	if (csk)
1100 		pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u, status %u.\n",
1101 			       (&csk->saddr), (&csk->daddr), csk,
1102 			       csk->state, csk->flags, csk->tid, rpl->status);
1103 
1104 	if (rpl->status == CPL_ERR_ABORT_FAILED)
1105 		goto rel_skb;
1106 
1107 	cxgbi_sock_rcv_abort_rpl(csk);
1108 rel_skb:
1109 	__kfree_skb(skb);
1110 }
1111 
1112 static void do_rx_data(struct cxgbi_device *cdev, struct sk_buff *skb)
1113 {
1114 	struct cxgbi_sock *csk;
1115 	struct cpl_rx_data *cpl = (struct cpl_rx_data *)skb->data;
1116 	unsigned int tid = GET_TID(cpl);
1117 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1118 	struct tid_info *t = lldi->tids;
1119 
1120 	csk = lookup_tid(t, tid);
1121 	if (!csk) {
1122 		pr_err("can't find connection for tid %u.\n", tid);
1123 	} else {
1124 		/* not expecting this, reset the connection. */
1125 		pr_err("csk 0x%p, tid %u, rcv cpl_rx_data.\n", csk, tid);
1126 		spin_lock_bh(&csk->lock);
1127 		send_abort_req(csk);
1128 		spin_unlock_bh(&csk->lock);
1129 	}
1130 	__kfree_skb(skb);
1131 }
1132 
1133 static void do_rx_iscsi_hdr(struct cxgbi_device *cdev, struct sk_buff *skb)
1134 {
1135 	struct cxgbi_sock *csk;
1136 	struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
1137 	unsigned short pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);
1138 	unsigned int tid = GET_TID(cpl);
1139 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1140 	struct tid_info *t = lldi->tids;
1141 
1142 	csk = lookup_tid(t, tid);
1143 	if (unlikely(!csk)) {
1144 		pr_err("can't find conn. for tid %u.\n", tid);
1145 		goto rel_skb;
1146 	}
1147 
1148 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1149 		"csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
1150 		csk, csk->state, csk->flags, csk->tid, skb, skb->len,
1151 		pdu_len_ddp);
1152 
1153 	spin_lock_bh(&csk->lock);
1154 
1155 	if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
1156 		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1157 			"csk 0x%p,%u,0x%lx,%u, bad state.\n",
1158 			csk, csk->state, csk->flags, csk->tid);
1159 		if (csk->state != CTP_ABORTING)
1160 			goto abort_conn;
1161 		else
1162 			goto discard;
1163 	}
1164 
1165 	cxgbi_skcb_tcp_seq(skb) = ntohl(cpl->seq);
1166 	cxgbi_skcb_flags(skb) = 0;
1167 
1168 	skb_reset_transport_header(skb);
1169 	__skb_pull(skb, sizeof(*cpl));
1170 	__pskb_trim(skb, ntohs(cpl->len));
1171 
1172 	if (!csk->skb_ulp_lhdr) {
1173 		unsigned char *bhs;
1174 		unsigned int hlen, dlen, plen;
1175 
1176 		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1177 			"csk 0x%p,%u,0x%lx, tid %u, skb 0x%p header.\n",
1178 			csk, csk->state, csk->flags, csk->tid, skb);
1179 		csk->skb_ulp_lhdr = skb;
1180 		cxgbi_skcb_set_flag(skb, SKCBF_RX_HDR);
1181 
1182 		if (cxgbi_skcb_tcp_seq(skb) != csk->rcv_nxt) {
1183 			pr_info("tid %u, CPL_ISCSI_HDR, bad seq, 0x%x/0x%x.\n",
1184 				csk->tid, cxgbi_skcb_tcp_seq(skb),
1185 				csk->rcv_nxt);
1186 			goto abort_conn;
1187 		}
1188 
1189 		bhs = skb->data;
1190 		hlen = ntohs(cpl->len);
1191 		dlen = ntohl(*(unsigned int *)(bhs + 4)) & 0xFFFFFF;
1192 
1193 		plen = ISCSI_PDU_LEN_G(pdu_len_ddp);
1194 		if (is_t4(lldi->adapter_type))
1195 			plen -= 40;
1196 
1197 		if ((hlen + dlen) != plen) {
1198 			pr_info("tid 0x%x, CPL_ISCSI_HDR, pdu len "
1199 				"mismatch %u != %u + %u, seq 0x%x.\n",
1200 				csk->tid, plen, hlen, dlen,
1201 				cxgbi_skcb_tcp_seq(skb));
1202 			goto abort_conn;
1203 		}
1204 
1205 		cxgbi_skcb_rx_pdulen(skb) = (hlen + dlen + 3) & (~0x3);
1206 		if (dlen)
1207 			cxgbi_skcb_rx_pdulen(skb) += csk->dcrc_len;
1208 		csk->rcv_nxt += cxgbi_skcb_rx_pdulen(skb);
1209 
1210 		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1211 			"csk 0x%p, skb 0x%p, 0x%x,%u+%u,0x%x,0x%x.\n",
1212 			csk, skb, *bhs, hlen, dlen,
1213 			ntohl(*((unsigned int *)(bhs + 16))),
1214 			ntohl(*((unsigned int *)(bhs + 24))));
1215 
1216 	} else {
1217 		struct sk_buff *lskb = csk->skb_ulp_lhdr;
1218 
1219 		cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);
1220 		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1221 			"csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
1222 			csk, csk->state, csk->flags, skb, lskb);
1223 	}
1224 
1225 	__skb_queue_tail(&csk->receive_queue, skb);
1226 	spin_unlock_bh(&csk->lock);
1227 	return;
1228 
1229 abort_conn:
1230 	send_abort_req(csk);
1231 discard:
1232 	spin_unlock_bh(&csk->lock);
1233 rel_skb:
1234 	__kfree_skb(skb);
1235 }
1236 
1237 static void do_rx_iscsi_data(struct cxgbi_device *cdev, struct sk_buff *skb)
1238 {
1239 	struct cxgbi_sock *csk;
1240 	struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
1241 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1242 	struct tid_info *t = lldi->tids;
1243 	struct sk_buff *lskb;
1244 	u32 tid = GET_TID(cpl);
1245 	u16 pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);
1246 
1247 	csk = lookup_tid(t, tid);
1248 	if (unlikely(!csk)) {
1249 		pr_err("can't find conn. for tid %u.\n", tid);
1250 		goto rel_skb;
1251 	}
1252 
1253 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1254 		  "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
1255 		  csk, csk->state, csk->flags, csk->tid, skb,
1256 		  skb->len, pdu_len_ddp);
1257 
1258 	spin_lock_bh(&csk->lock);
1259 
1260 	if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
1261 		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1262 			  "csk 0x%p,%u,0x%lx,%u, bad state.\n",
1263 			  csk, csk->state, csk->flags, csk->tid);
1264 
1265 		if (csk->state != CTP_ABORTING)
1266 			goto abort_conn;
1267 		else
1268 			goto discard;
1269 	}
1270 
1271 	cxgbi_skcb_tcp_seq(skb) = be32_to_cpu(cpl->seq);
1272 	cxgbi_skcb_flags(skb) = 0;
1273 
1274 	skb_reset_transport_header(skb);
1275 	__skb_pull(skb, sizeof(*cpl));
1276 	__pskb_trim(skb, ntohs(cpl->len));
1277 
1278 	if (!csk->skb_ulp_lhdr)
1279 		csk->skb_ulp_lhdr = skb;
1280 
1281 	lskb = csk->skb_ulp_lhdr;
1282 	cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);
1283 
1284 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1285 		  "csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
1286 		  csk, csk->state, csk->flags, skb, lskb);
1287 
1288 	__skb_queue_tail(&csk->receive_queue, skb);
1289 	spin_unlock_bh(&csk->lock);
1290 	return;
1291 
1292 abort_conn:
1293 	send_abort_req(csk);
1294 discard:
1295 	spin_unlock_bh(&csk->lock);
1296 rel_skb:
1297 	__kfree_skb(skb);
1298 }
1299 
1300 static void
1301 cxgb4i_process_ddpvld(struct cxgbi_sock *csk,
1302 		      struct sk_buff *skb, u32 ddpvld)
1303 {
1304 	if (ddpvld & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT)) {
1305 		pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, hcrc bad 0x%lx.\n",
1306 			csk, skb, ddpvld, cxgbi_skcb_flags(skb));
1307 		cxgbi_skcb_set_flag(skb, SKCBF_RX_HCRC_ERR);
1308 	}
1309 
1310 	if (ddpvld & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT)) {
1311 		pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, dcrc bad 0x%lx.\n",
1312 			csk, skb, ddpvld, cxgbi_skcb_flags(skb));
1313 		cxgbi_skcb_set_flag(skb, SKCBF_RX_DCRC_ERR);
1314 	}
1315 
1316 	if (ddpvld & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT)) {
1317 		log_debug(1 << CXGBI_DBG_PDU_RX,
1318 			  "csk 0x%p, lhdr 0x%p, status 0x%x, pad bad.\n",
1319 			  csk, skb, ddpvld);
1320 		cxgbi_skcb_set_flag(skb, SKCBF_RX_PAD_ERR);
1321 	}
1322 
1323 	if ((ddpvld & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT)) &&
1324 	    !cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1325 		log_debug(1 << CXGBI_DBG_PDU_RX,
1326 			  "csk 0x%p, lhdr 0x%p, 0x%x, data ddp'ed.\n",
1327 			  csk, skb, ddpvld);
1328 		cxgbi_skcb_set_flag(skb, SKCBF_RX_DATA_DDPD);
1329 	}
1330 }
1331 
1332 static void do_rx_data_ddp(struct cxgbi_device *cdev,
1333 				  struct sk_buff *skb)
1334 {
1335 	struct cxgbi_sock *csk;
1336 	struct sk_buff *lskb;
1337 	struct cpl_rx_data_ddp *rpl = (struct cpl_rx_data_ddp *)skb->data;
1338 	unsigned int tid = GET_TID(rpl);
1339 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1340 	struct tid_info *t = lldi->tids;
1341 	u32 ddpvld = be32_to_cpu(rpl->ddpvld);
1342 
1343 	csk = lookup_tid(t, tid);
1344 	if (unlikely(!csk)) {
1345 		pr_err("can't find connection for tid %u.\n", tid);
1346 		goto rel_skb;
1347 	}
1348 
1349 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1350 		"csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p.\n",
1351 		csk, csk->state, csk->flags, skb, ddpvld, csk->skb_ulp_lhdr);
1352 
1353 	spin_lock_bh(&csk->lock);
1354 
1355 	if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
1356 		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1357 			"csk 0x%p,%u,0x%lx,%u, bad state.\n",
1358 			csk, csk->state, csk->flags, csk->tid);
1359 		if (csk->state != CTP_ABORTING)
1360 			goto abort_conn;
1361 		else
1362 			goto discard;
1363 	}
1364 
1365 	if (!csk->skb_ulp_lhdr) {
1366 		pr_err("tid 0x%x, rcv RX_DATA_DDP w/o pdu bhs.\n", csk->tid);
1367 		goto abort_conn;
1368 	}
1369 
1370 	lskb = csk->skb_ulp_lhdr;
1371 	csk->skb_ulp_lhdr = NULL;
1372 
1373 	cxgbi_skcb_rx_ddigest(lskb) = ntohl(rpl->ulp_crc);
1374 
1375 	if (ntohs(rpl->len) != cxgbi_skcb_rx_pdulen(lskb))
1376 		pr_info("tid 0x%x, RX_DATA_DDP pdulen %u != %u.\n",
1377 			csk->tid, ntohs(rpl->len), cxgbi_skcb_rx_pdulen(lskb));
1378 
1379 	cxgb4i_process_ddpvld(csk, lskb, ddpvld);
1380 
1381 	log_debug(1 << CXGBI_DBG_PDU_RX,
1382 		"csk 0x%p, lskb 0x%p, f 0x%lx.\n",
1383 		csk, lskb, cxgbi_skcb_flags(lskb));
1384 
1385 	cxgbi_skcb_set_flag(lskb, SKCBF_RX_STATUS);
1386 	cxgbi_conn_pdu_ready(csk);
1387 	spin_unlock_bh(&csk->lock);
1388 	goto rel_skb;
1389 
1390 abort_conn:
1391 	send_abort_req(csk);
1392 discard:
1393 	spin_unlock_bh(&csk->lock);
1394 rel_skb:
1395 	__kfree_skb(skb);
1396 }
1397 
1398 static void
1399 do_rx_iscsi_cmp(struct cxgbi_device *cdev, struct sk_buff *skb)
1400 {
1401 	struct cxgbi_sock *csk;
1402 	struct cpl_rx_iscsi_cmp *rpl = (struct cpl_rx_iscsi_cmp *)skb->data;
1403 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1404 	struct tid_info *t = lldi->tids;
1405 	struct sk_buff *data_skb = NULL;
1406 	u32 tid = GET_TID(rpl);
1407 	u32 ddpvld = be32_to_cpu(rpl->ddpvld);
1408 	u32 seq = be32_to_cpu(rpl->seq);
1409 	u16 pdu_len_ddp = be16_to_cpu(rpl->pdu_len_ddp);
1410 
1411 	csk = lookup_tid(t, tid);
1412 	if (unlikely(!csk)) {
1413 		pr_err("can't find connection for tid %u.\n", tid);
1414 		goto rel_skb;
1415 	}
1416 
1417 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1418 		  "csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p, len %u, "
1419 		  "pdu_len_ddp %u, status %u.\n",
1420 		  csk, csk->state, csk->flags, skb, ddpvld, csk->skb_ulp_lhdr,
1421 		  ntohs(rpl->len), pdu_len_ddp,  rpl->status);
1422 
1423 	spin_lock_bh(&csk->lock);
1424 
1425 	if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
1426 		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1427 			  "csk 0x%p,%u,0x%lx,%u, bad state.\n",
1428 			  csk, csk->state, csk->flags, csk->tid);
1429 
1430 		if (csk->state != CTP_ABORTING)
1431 			goto abort_conn;
1432 		else
1433 			goto discard;
1434 	}
1435 
1436 	cxgbi_skcb_tcp_seq(skb) = seq;
1437 	cxgbi_skcb_flags(skb) = 0;
1438 	cxgbi_skcb_rx_pdulen(skb) = 0;
1439 
1440 	skb_reset_transport_header(skb);
1441 	__skb_pull(skb, sizeof(*rpl));
1442 	__pskb_trim(skb, be16_to_cpu(rpl->len));
1443 
1444 	csk->rcv_nxt = seq + pdu_len_ddp;
1445 
1446 	if (csk->skb_ulp_lhdr) {
1447 		data_skb = skb_peek(&csk->receive_queue);
1448 		if (!data_skb ||
1449 		    !cxgbi_skcb_test_flag(data_skb, SKCBF_RX_DATA)) {
1450 			pr_err("Error! freelist data not found 0x%p, tid %u\n",
1451 			       data_skb, tid);
1452 
1453 			goto abort_conn;
1454 		}
1455 		__skb_unlink(data_skb, &csk->receive_queue);
1456 
1457 		cxgbi_skcb_set_flag(skb, SKCBF_RX_DATA);
1458 
1459 		__skb_queue_tail(&csk->receive_queue, skb);
1460 		__skb_queue_tail(&csk->receive_queue, data_skb);
1461 	} else {
1462 		 __skb_queue_tail(&csk->receive_queue, skb);
1463 	}
1464 
1465 	csk->skb_ulp_lhdr = NULL;
1466 
1467 	cxgbi_skcb_set_flag(skb, SKCBF_RX_HDR);
1468 	cxgbi_skcb_set_flag(skb, SKCBF_RX_STATUS);
1469 	cxgbi_skcb_set_flag(skb, SKCBF_RX_ISCSI_COMPL);
1470 	cxgbi_skcb_rx_ddigest(skb) = be32_to_cpu(rpl->ulp_crc);
1471 
1472 	cxgb4i_process_ddpvld(csk, skb, ddpvld);
1473 
1474 	log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, skb 0x%p, f 0x%lx.\n",
1475 		  csk, skb, cxgbi_skcb_flags(skb));
1476 
1477 	cxgbi_conn_pdu_ready(csk);
1478 	spin_unlock_bh(&csk->lock);
1479 
1480 	return;
1481 
1482 abort_conn:
1483 	send_abort_req(csk);
1484 discard:
1485 	spin_unlock_bh(&csk->lock);
1486 rel_skb:
1487 	__kfree_skb(skb);
1488 }
1489 
1490 static void do_fw4_ack(struct cxgbi_device *cdev, struct sk_buff *skb)
1491 {
1492 	struct cxgbi_sock *csk;
1493 	struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)skb->data;
1494 	unsigned int tid = GET_TID(rpl);
1495 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1496 	struct tid_info *t = lldi->tids;
1497 
1498 	csk = lookup_tid(t, tid);
1499 	if (unlikely(!csk))
1500 		pr_err("can't find connection for tid %u.\n", tid);
1501 	else {
1502 		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1503 			"csk 0x%p,%u,0x%lx,%u.\n",
1504 			csk, csk->state, csk->flags, csk->tid);
1505 		cxgbi_sock_rcv_wr_ack(csk, rpl->credits, ntohl(rpl->snd_una),
1506 					rpl->seq_vld);
1507 	}
1508 	__kfree_skb(skb);
1509 }
1510 
1511 static void do_set_tcb_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
1512 {
1513 	struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
1514 	unsigned int tid = GET_TID(rpl);
1515 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1516 	struct tid_info *t = lldi->tids;
1517 	struct cxgbi_sock *csk;
1518 
1519 	csk = lookup_tid(t, tid);
1520 	if (!csk)
1521 		pr_err("can't find conn. for tid %u.\n", tid);
1522 
1523 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1524 		"csk 0x%p,%u,%lx,%u, status 0x%x.\n",
1525 		csk, csk->state, csk->flags, csk->tid, rpl->status);
1526 
1527 	if (rpl->status != CPL_ERR_NONE)
1528 		pr_err("csk 0x%p,%u, SET_TCB_RPL status %u.\n",
1529 			csk, tid, rpl->status);
1530 
1531 	__kfree_skb(skb);
1532 }
1533 
1534 static int alloc_cpls(struct cxgbi_sock *csk)
1535 {
1536 	csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req),
1537 					0, GFP_KERNEL);
1538 	if (!csk->cpl_close)
1539 		return -ENOMEM;
1540 
1541 	csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req),
1542 					0, GFP_KERNEL);
1543 	if (!csk->cpl_abort_req)
1544 		goto free_cpls;
1545 
1546 	csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl),
1547 					0, GFP_KERNEL);
1548 	if (!csk->cpl_abort_rpl)
1549 		goto free_cpls;
1550 	return 0;
1551 
1552 free_cpls:
1553 	cxgbi_sock_free_cpl_skbs(csk);
1554 	return -ENOMEM;
1555 }
1556 
1557 static inline void l2t_put(struct cxgbi_sock *csk)
1558 {
1559 	if (csk->l2t) {
1560 		cxgb4_l2t_release(csk->l2t);
1561 		csk->l2t = NULL;
1562 		cxgbi_sock_put(csk);
1563 	}
1564 }
1565 
1566 static void release_offload_resources(struct cxgbi_sock *csk)
1567 {
1568 	struct cxgb4_lld_info *lldi;
1569 #if IS_ENABLED(CONFIG_IPV6)
1570 	struct net_device *ndev = csk->cdev->ports[csk->port_id];
1571 #endif
1572 
1573 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1574 		"csk 0x%p,%u,0x%lx,%u.\n",
1575 		csk, csk->state, csk->flags, csk->tid);
1576 
1577 	cxgbi_sock_free_cpl_skbs(csk);
1578 	if (csk->wr_cred != csk->wr_max_cred) {
1579 		cxgbi_sock_purge_wr_queue(csk);
1580 		cxgbi_sock_reset_wr_list(csk);
1581 	}
1582 
1583 	l2t_put(csk);
1584 #if IS_ENABLED(CONFIG_IPV6)
1585 	if (csk->csk_family == AF_INET6)
1586 		cxgb4_clip_release(ndev,
1587 				   (const u32 *)&csk->saddr6.sin6_addr, 1);
1588 #endif
1589 
1590 	if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
1591 		free_atid(csk);
1592 	else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
1593 		lldi = cxgbi_cdev_priv(csk->cdev);
1594 		cxgb4_remove_tid(lldi->tids, 0, csk->tid,
1595 				 csk->csk_family);
1596 		cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
1597 		cxgbi_sock_put(csk);
1598 	}
1599 	csk->dst = NULL;
1600 }
1601 
1602 static int init_act_open(struct cxgbi_sock *csk)
1603 {
1604 	struct cxgbi_device *cdev = csk->cdev;
1605 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1606 	struct net_device *ndev = cdev->ports[csk->port_id];
1607 	struct sk_buff *skb = NULL;
1608 	struct neighbour *n = NULL;
1609 	void *daddr;
1610 	unsigned int step;
1611 	unsigned int rxq_idx;
1612 	unsigned int size, size6;
1613 	unsigned int linkspeed;
1614 	unsigned int rcv_winf, snd_winf;
1615 
1616 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1617 		"csk 0x%p,%u,0x%lx,%u.\n",
1618 		csk, csk->state, csk->flags, csk->tid);
1619 
1620 	if (csk->csk_family == AF_INET)
1621 		daddr = &csk->daddr.sin_addr.s_addr;
1622 #if IS_ENABLED(CONFIG_IPV6)
1623 	else if (csk->csk_family == AF_INET6)
1624 		daddr = &csk->daddr6.sin6_addr;
1625 #endif
1626 	else {
1627 		pr_err("address family 0x%x not supported\n", csk->csk_family);
1628 		goto rel_resource;
1629 	}
1630 
1631 	n = dst_neigh_lookup(csk->dst, daddr);
1632 
1633 	if (!n) {
1634 		pr_err("%s, can't get neighbour of csk->dst.\n", ndev->name);
1635 		goto rel_resource;
1636 	}
1637 
1638 	csk->atid = cxgb4_alloc_atid(lldi->tids, csk);
1639 	if (csk->atid < 0) {
1640 		pr_err("%s, NO atid available.\n", ndev->name);
1641 		goto rel_resource_without_clip;
1642 	}
1643 	cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
1644 	cxgbi_sock_get(csk);
1645 
1646 	csk->l2t = cxgb4_l2t_get(lldi->l2t, n, ndev, 0);
1647 	if (!csk->l2t) {
1648 		pr_err("%s, cannot alloc l2t.\n", ndev->name);
1649 		goto rel_resource_without_clip;
1650 	}
1651 	cxgbi_sock_get(csk);
1652 
1653 #if IS_ENABLED(CONFIG_IPV6)
1654 	if (csk->csk_family == AF_INET6)
1655 		cxgb4_clip_get(ndev, (const u32 *)&csk->saddr6.sin6_addr, 1);
1656 #endif
1657 
1658 	if (is_t4(lldi->adapter_type)) {
1659 		size = sizeof(struct cpl_act_open_req);
1660 		size6 = sizeof(struct cpl_act_open_req6);
1661 	} else if (is_t5(lldi->adapter_type)) {
1662 		size = sizeof(struct cpl_t5_act_open_req);
1663 		size6 = sizeof(struct cpl_t5_act_open_req6);
1664 	} else {
1665 		size = sizeof(struct cpl_t6_act_open_req);
1666 		size6 = sizeof(struct cpl_t6_act_open_req6);
1667 	}
1668 
1669 	if (csk->csk_family == AF_INET)
1670 		skb = alloc_wr(size, 0, GFP_NOIO);
1671 #if IS_ENABLED(CONFIG_IPV6)
1672 	else
1673 		skb = alloc_wr(size6, 0, GFP_NOIO);
1674 #endif
1675 
1676 	if (!skb)
1677 		goto rel_resource;
1678 	skb->sk = (struct sock *)csk;
1679 	t4_set_arp_err_handler(skb, csk, cxgbi_sock_act_open_req_arp_failure);
1680 
1681 	if (!csk->mtu)
1682 		csk->mtu = dst_mtu(csk->dst);
1683 	cxgb4_best_mtu(lldi->mtus, csk->mtu, &csk->mss_idx);
1684 	csk->tx_chan = cxgb4_port_chan(ndev);
1685 	csk->smac_idx = cxgb4_tp_smt_idx(lldi->adapter_type,
1686 					 cxgb4_port_viid(ndev));
1687 	step = lldi->ntxq / lldi->nchan;
1688 	csk->txq_idx = cxgb4_port_idx(ndev) * step;
1689 	step = lldi->nrxq / lldi->nchan;
1690 	rxq_idx = (cxgb4_port_idx(ndev) * step) + (cdev->rxq_idx_cntr % step);
1691 	cdev->rxq_idx_cntr++;
1692 	csk->rss_qid = lldi->rxq_ids[rxq_idx];
1693 	linkspeed = ((struct port_info *)netdev_priv(ndev))->link_cfg.speed;
1694 	csk->snd_win = cxgb4i_snd_win;
1695 	csk->rcv_win = cxgb4i_rcv_win;
1696 	if (cxgb4i_rcv_win <= 0) {
1697 		csk->rcv_win = CXGB4I_DEFAULT_10G_RCV_WIN;
1698 		rcv_winf = linkspeed / SPEED_10000;
1699 		if (rcv_winf)
1700 			csk->rcv_win *= rcv_winf;
1701 	}
1702 	if (cxgb4i_snd_win <= 0) {
1703 		csk->snd_win = CXGB4I_DEFAULT_10G_SND_WIN;
1704 		snd_winf = linkspeed / SPEED_10000;
1705 		if (snd_winf)
1706 			csk->snd_win *= snd_winf;
1707 	}
1708 	csk->wr_cred = lldi->wr_cred -
1709 		       DIV_ROUND_UP(sizeof(struct cpl_abort_req), 16);
1710 	csk->wr_max_cred = csk->wr_cred;
1711 	csk->wr_una_cred = 0;
1712 	cxgbi_sock_reset_wr_list(csk);
1713 	csk->err = 0;
1714 
1715 	pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u,%u,%u, mtu %u,%u, smac %u.\n",
1716 		       (&csk->saddr), (&csk->daddr), csk, csk->state,
1717 		       csk->flags, csk->tx_chan, csk->txq_idx, csk->rss_qid,
1718 		       csk->mtu, csk->mss_idx, csk->smac_idx);
1719 
1720 	/* must wait for either a act_open_rpl or act_open_establish */
1721 	if (!try_module_get(cdev->owner)) {
1722 		pr_err("%s, try_module_get failed.\n", ndev->name);
1723 		goto rel_resource;
1724 	}
1725 
1726 	cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
1727 	if (csk->csk_family == AF_INET)
1728 		send_act_open_req(csk, skb, csk->l2t);
1729 #if IS_ENABLED(CONFIG_IPV6)
1730 	else
1731 		send_act_open_req6(csk, skb, csk->l2t);
1732 #endif
1733 	neigh_release(n);
1734 
1735 	return 0;
1736 
1737 rel_resource:
1738 #if IS_ENABLED(CONFIG_IPV6)
1739 	if (csk->csk_family == AF_INET6)
1740 		cxgb4_clip_release(ndev,
1741 				   (const u32 *)&csk->saddr6.sin6_addr, 1);
1742 #endif
1743 rel_resource_without_clip:
1744 	if (n)
1745 		neigh_release(n);
1746 	if (skb)
1747 		__kfree_skb(skb);
1748 	return -EINVAL;
1749 }
1750 
1751 static cxgb4i_cplhandler_func cxgb4i_cplhandlers[NUM_CPL_CMDS] = {
1752 	[CPL_ACT_ESTABLISH] = do_act_establish,
1753 	[CPL_ACT_OPEN_RPL] = do_act_open_rpl,
1754 	[CPL_PEER_CLOSE] = do_peer_close,
1755 	[CPL_ABORT_REQ_RSS] = do_abort_req_rss,
1756 	[CPL_ABORT_RPL_RSS] = do_abort_rpl_rss,
1757 	[CPL_CLOSE_CON_RPL] = do_close_con_rpl,
1758 	[CPL_FW4_ACK] = do_fw4_ack,
1759 	[CPL_ISCSI_HDR] = do_rx_iscsi_hdr,
1760 	[CPL_ISCSI_DATA] = do_rx_iscsi_data,
1761 	[CPL_SET_TCB_RPL] = do_set_tcb_rpl,
1762 	[CPL_RX_DATA_DDP] = do_rx_data_ddp,
1763 	[CPL_RX_ISCSI_DDP] = do_rx_data_ddp,
1764 	[CPL_RX_ISCSI_CMP] = do_rx_iscsi_cmp,
1765 	[CPL_RX_DATA] = do_rx_data,
1766 };
1767 
1768 static int cxgb4i_ofld_init(struct cxgbi_device *cdev)
1769 {
1770 	int rc;
1771 
1772 	if (cxgb4i_max_connect > CXGB4I_MAX_CONN)
1773 		cxgb4i_max_connect = CXGB4I_MAX_CONN;
1774 
1775 	rc = cxgbi_device_portmap_create(cdev, cxgb4i_sport_base,
1776 					cxgb4i_max_connect);
1777 	if (rc < 0)
1778 		return rc;
1779 
1780 	cdev->csk_release_offload_resources = release_offload_resources;
1781 	cdev->csk_push_tx_frames = push_tx_frames;
1782 	cdev->csk_send_abort_req = send_abort_req;
1783 	cdev->csk_send_close_req = send_close_req;
1784 	cdev->csk_send_rx_credits = send_rx_credits;
1785 	cdev->csk_alloc_cpls = alloc_cpls;
1786 	cdev->csk_init_act_open = init_act_open;
1787 
1788 	pr_info("cdev 0x%p, offload up, added.\n", cdev);
1789 	return 0;
1790 }
1791 
1792 static inline void
1793 ulp_mem_io_set_hdr(struct cxgbi_device *cdev,
1794 		   struct ulp_mem_io *req,
1795 		   unsigned int wr_len, unsigned int dlen,
1796 		   unsigned int pm_addr,
1797 		   int tid)
1798 {
1799 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1800 	struct ulptx_idata *idata = (struct ulptx_idata *)(req + 1);
1801 
1802 	INIT_ULPTX_WR(req, wr_len, 0, tid);
1803 	req->wr.wr_hi = htonl(FW_WR_OP_V(FW_ULPTX_WR) |
1804 		FW_WR_ATOMIC_V(0));
1805 	req->cmd = htonl(ULPTX_CMD_V(ULP_TX_MEM_WRITE) |
1806 		ULP_MEMIO_ORDER_V(is_t4(lldi->adapter_type)) |
1807 		T5_ULP_MEMIO_IMM_V(!is_t4(lldi->adapter_type)));
1808 	req->dlen = htonl(ULP_MEMIO_DATA_LEN_V(dlen >> 5));
1809 	req->lock_addr = htonl(ULP_MEMIO_ADDR_V(pm_addr >> 5));
1810 	req->len16 = htonl(DIV_ROUND_UP(wr_len - sizeof(req->wr), 16));
1811 
1812 	idata->cmd_more = htonl(ULPTX_CMD_V(ULP_TX_SC_IMM));
1813 	idata->len = htonl(dlen);
1814 }
1815 
1816 static struct sk_buff *
1817 ddp_ppod_init_idata(struct cxgbi_device *cdev,
1818 		    struct cxgbi_ppm *ppm,
1819 		    unsigned int idx, unsigned int npods,
1820 		    unsigned int tid)
1821 {
1822 	unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ppm->llimit;
1823 	unsigned int dlen = npods << PPOD_SIZE_SHIFT;
1824 	unsigned int wr_len = roundup(sizeof(struct ulp_mem_io) +
1825 				sizeof(struct ulptx_idata) + dlen, 16);
1826 	struct sk_buff *skb = alloc_wr(wr_len, 0, GFP_ATOMIC);
1827 
1828 	if (!skb) {
1829 		pr_err("%s: %s idx %u, npods %u, OOM.\n",
1830 		       __func__, ppm->ndev->name, idx, npods);
1831 		return NULL;
1832 	}
1833 
1834 	ulp_mem_io_set_hdr(cdev, (struct ulp_mem_io *)skb->head, wr_len, dlen,
1835 			   pm_addr, tid);
1836 
1837 	return skb;
1838 }
1839 
1840 static int ddp_ppod_write_idata(struct cxgbi_ppm *ppm, struct cxgbi_sock *csk,
1841 				struct cxgbi_task_tag_info *ttinfo,
1842 				unsigned int idx, unsigned int npods,
1843 				struct scatterlist **sg_pp,
1844 				unsigned int *sg_off)
1845 {
1846 	struct cxgbi_device *cdev = csk->cdev;
1847 	struct sk_buff *skb = ddp_ppod_init_idata(cdev, ppm, idx, npods,
1848 						  csk->tid);
1849 	struct ulp_mem_io *req;
1850 	struct ulptx_idata *idata;
1851 	struct cxgbi_pagepod *ppod;
1852 	int i;
1853 
1854 	if (!skb)
1855 		return -ENOMEM;
1856 
1857 	req = (struct ulp_mem_io *)skb->head;
1858 	idata = (struct ulptx_idata *)(req + 1);
1859 	ppod = (struct cxgbi_pagepod *)(idata + 1);
1860 
1861 	for (i = 0; i < npods; i++, ppod++)
1862 		cxgbi_ddp_set_one_ppod(ppod, ttinfo, sg_pp, sg_off);
1863 
1864 	cxgbi_skcb_set_flag(skb, SKCBF_TX_MEM_WRITE);
1865 	cxgbi_skcb_set_flag(skb, SKCBF_TX_FLAG_COMPL);
1866 	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
1867 
1868 	spin_lock_bh(&csk->lock);
1869 	cxgbi_sock_skb_entail(csk, skb);
1870 	spin_unlock_bh(&csk->lock);
1871 
1872 	return 0;
1873 }
1874 
1875 static int ddp_set_map(struct cxgbi_ppm *ppm, struct cxgbi_sock *csk,
1876 		       struct cxgbi_task_tag_info *ttinfo)
1877 {
1878 	unsigned int pidx = ttinfo->idx;
1879 	unsigned int npods = ttinfo->npods;
1880 	unsigned int i, cnt;
1881 	int err = 0;
1882 	struct scatterlist *sg = ttinfo->sgl;
1883 	unsigned int offset = 0;
1884 
1885 	ttinfo->cid = csk->port_id;
1886 
1887 	for (i = 0; i < npods; i += cnt, pidx += cnt) {
1888 		cnt = npods - i;
1889 
1890 		if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1891 			cnt = ULPMEM_IDATA_MAX_NPPODS;
1892 		err = ddp_ppod_write_idata(ppm, csk, ttinfo, pidx, cnt,
1893 					   &sg, &offset);
1894 		if (err < 0)
1895 			break;
1896 	}
1897 
1898 	return err;
1899 }
1900 
1901 static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk, unsigned int tid,
1902 				int pg_idx, bool reply)
1903 {
1904 	struct sk_buff *skb;
1905 	struct cpl_set_tcb_field *req;
1906 
1907 	if (!pg_idx || pg_idx >= DDP_PGIDX_MAX)
1908 		return 0;
1909 
1910 	skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1911 	if (!skb)
1912 		return -ENOMEM;
1913 
1914 	/*  set up ulp page size */
1915 	req = (struct cpl_set_tcb_field *)skb->head;
1916 	INIT_TP_WR(req, csk->tid);
1917 	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
1918 	req->reply_ctrl = htons(NO_REPLY_V(reply) | QUEUENO_V(csk->rss_qid));
1919 	req->word_cookie = htons(0);
1920 	req->mask = cpu_to_be64(0x3 << 8);
1921 	req->val = cpu_to_be64(pg_idx << 8);
1922 	set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1923 
1924 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1925 		"csk 0x%p, tid 0x%x, pg_idx %u.\n", csk, csk->tid, pg_idx);
1926 
1927 	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1928 	return 0;
1929 }
1930 
1931 static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
1932 				 int hcrc, int dcrc, int reply)
1933 {
1934 	struct sk_buff *skb;
1935 	struct cpl_set_tcb_field *req;
1936 
1937 	if (!hcrc && !dcrc)
1938 		return 0;
1939 
1940 	skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1941 	if (!skb)
1942 		return -ENOMEM;
1943 
1944 	csk->hcrc_len = (hcrc ? 4 : 0);
1945 	csk->dcrc_len = (dcrc ? 4 : 0);
1946 	/*  set up ulp submode */
1947 	req = (struct cpl_set_tcb_field *)skb->head;
1948 	INIT_TP_WR(req, tid);
1949 	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1950 	req->reply_ctrl = htons(NO_REPLY_V(reply) | QUEUENO_V(csk->rss_qid));
1951 	req->word_cookie = htons(0);
1952 	req->mask = cpu_to_be64(0x3 << 4);
1953 	req->val = cpu_to_be64(((hcrc ? ULP_CRC_HEADER : 0) |
1954 				(dcrc ? ULP_CRC_DATA : 0)) << 4);
1955 	set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1956 
1957 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1958 		"csk 0x%p, tid 0x%x, crc %d,%d.\n", csk, csk->tid, hcrc, dcrc);
1959 
1960 	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1961 	return 0;
1962 }
1963 
1964 static struct cxgbi_ppm *cdev2ppm(struct cxgbi_device *cdev)
1965 {
1966 	return (struct cxgbi_ppm *)(*((struct cxgb4_lld_info *)
1967 				       (cxgbi_cdev_priv(cdev)))->iscsi_ppm);
1968 }
1969 
1970 static int cxgb4i_ddp_init(struct cxgbi_device *cdev)
1971 {
1972 	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1973 	struct net_device *ndev = cdev->ports[0];
1974 	struct cxgbi_tag_format tformat;
1975 	unsigned int ppmax;
1976 	int i;
1977 
1978 	if (!lldi->vr->iscsi.size) {
1979 		pr_warn("%s, iscsi NOT enabled, check config!\n", ndev->name);
1980 		return -EACCES;
1981 	}
1982 
1983 	cdev->flags |= CXGBI_FLAG_USE_PPOD_OFLDQ;
1984 	ppmax = lldi->vr->iscsi.size >> PPOD_SIZE_SHIFT;
1985 
1986 	memset(&tformat, 0, sizeof(struct cxgbi_tag_format));
1987 	for (i = 0; i < 4; i++)
1988 		tformat.pgsz_order[i] = (lldi->iscsi_pgsz_order >> (i << 3))
1989 					 & 0xF;
1990 	cxgbi_tagmask_check(lldi->iscsi_tagmask, &tformat);
1991 
1992 	cxgbi_ddp_ppm_setup(lldi->iscsi_ppm, cdev, &tformat, ppmax,
1993 			    lldi->iscsi_llimit, lldi->vr->iscsi.start, 2);
1994 
1995 	cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
1996 	cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
1997 	cdev->csk_ddp_set_map = ddp_set_map;
1998 	cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1999 				  lldi->iscsi_iolen - ISCSI_PDU_NONPAYLOAD_LEN);
2000 	cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
2001 				  lldi->iscsi_iolen - ISCSI_PDU_NONPAYLOAD_LEN);
2002 	cdev->cdev2ppm = cdev2ppm;
2003 
2004 	return 0;
2005 }
2006 
2007 static void *t4_uld_add(const struct cxgb4_lld_info *lldi)
2008 {
2009 	struct cxgbi_device *cdev;
2010 	struct port_info *pi;
2011 	int i, rc;
2012 
2013 	cdev = cxgbi_device_register(sizeof(*lldi), lldi->nports);
2014 	if (!cdev) {
2015 		pr_info("t4 device 0x%p, register failed.\n", lldi);
2016 		return NULL;
2017 	}
2018 	pr_info("0x%p,0x%x, ports %u,%s, chan %u, q %u,%u, wr %u.\n",
2019 		cdev, lldi->adapter_type, lldi->nports,
2020 		lldi->ports[0]->name, lldi->nchan, lldi->ntxq,
2021 		lldi->nrxq, lldi->wr_cred);
2022 	for (i = 0; i < lldi->nrxq; i++)
2023 		log_debug(1 << CXGBI_DBG_DEV,
2024 			"t4 0x%p, rxq id #%d: %u.\n",
2025 			cdev, i, lldi->rxq_ids[i]);
2026 
2027 	memcpy(cxgbi_cdev_priv(cdev), lldi, sizeof(*lldi));
2028 	cdev->flags = CXGBI_FLAG_DEV_T4;
2029 	cdev->pdev = lldi->pdev;
2030 	cdev->ports = lldi->ports;
2031 	cdev->nports = lldi->nports;
2032 	cdev->mtus = lldi->mtus;
2033 	cdev->nmtus = NMTUS;
2034 	cdev->rx_credit_thres = (CHELSIO_CHIP_VERSION(lldi->adapter_type) <=
2035 				 CHELSIO_T5) ? cxgb4i_rx_credit_thres : 0;
2036 	cdev->skb_tx_rsvd = CXGB4I_TX_HEADER_LEN;
2037 	cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr);
2038 	cdev->itp = &cxgb4i_iscsi_transport;
2039 	cdev->owner = THIS_MODULE;
2040 
2041 	cdev->pfvf = FW_VIID_PFN_G(cxgb4_port_viid(lldi->ports[0]))
2042 			<< FW_VIID_PFN_S;
2043 	pr_info("cdev 0x%p,%s, pfvf %u.\n",
2044 		cdev, lldi->ports[0]->name, cdev->pfvf);
2045 
2046 	rc = cxgb4i_ddp_init(cdev);
2047 	if (rc) {
2048 		pr_info("t4 0x%p ddp init failed.\n", cdev);
2049 		goto err_out;
2050 	}
2051 	rc = cxgb4i_ofld_init(cdev);
2052 	if (rc) {
2053 		pr_info("t4 0x%p ofld init failed.\n", cdev);
2054 		goto err_out;
2055 	}
2056 
2057 	rc = cxgbi_hbas_add(cdev, CXGB4I_MAX_LUN, CXGBI_MAX_CONN,
2058 				&cxgb4i_host_template, cxgb4i_stt);
2059 	if (rc)
2060 		goto err_out;
2061 
2062 	for (i = 0; i < cdev->nports; i++) {
2063 		pi = netdev_priv(lldi->ports[i]);
2064 		cdev->hbas[i]->port_id = pi->port_id;
2065 	}
2066 	return cdev;
2067 
2068 err_out:
2069 	cxgbi_device_unregister(cdev);
2070 	return ERR_PTR(-ENOMEM);
2071 }
2072 
2073 #define RX_PULL_LEN	128
2074 static int t4_uld_rx_handler(void *handle, const __be64 *rsp,
2075 				const struct pkt_gl *pgl)
2076 {
2077 	const struct cpl_act_establish *rpl;
2078 	struct sk_buff *skb;
2079 	unsigned int opc;
2080 	struct cxgbi_device *cdev = handle;
2081 
2082 	if (pgl == NULL) {
2083 		unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
2084 
2085 		skb = alloc_wr(len, 0, GFP_ATOMIC);
2086 		if (!skb)
2087 			goto nomem;
2088 		skb_copy_to_linear_data(skb, &rsp[1], len);
2089 	} else {
2090 		if (unlikely(*(u8 *)rsp != *(u8 *)pgl->va)) {
2091 			pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
2092 				pgl->va, be64_to_cpu(*rsp),
2093 				be64_to_cpu(*(u64 *)pgl->va),
2094 				pgl->tot_len);
2095 			return 0;
2096 		}
2097 		skb = cxgb4_pktgl_to_skb(pgl, RX_PULL_LEN, RX_PULL_LEN);
2098 		if (unlikely(!skb))
2099 			goto nomem;
2100 	}
2101 
2102 	rpl = (struct cpl_act_establish *)skb->data;
2103 	opc = rpl->ot.opcode;
2104 	log_debug(1 << CXGBI_DBG_TOE,
2105 		"cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
2106 		 cdev, opc, rpl->ot.opcode_tid, ntohl(rpl->ot.opcode_tid), skb);
2107 	if (cxgb4i_cplhandlers[opc])
2108 		cxgb4i_cplhandlers[opc](cdev, skb);
2109 	else {
2110 		pr_err("No handler for opcode 0x%x.\n", opc);
2111 		__kfree_skb(skb);
2112 	}
2113 	return 0;
2114 nomem:
2115 	log_debug(1 << CXGBI_DBG_TOE, "OOM bailing out.\n");
2116 	return 1;
2117 }
2118 
2119 static int t4_uld_state_change(void *handle, enum cxgb4_state state)
2120 {
2121 	struct cxgbi_device *cdev = handle;
2122 
2123 	switch (state) {
2124 	case CXGB4_STATE_UP:
2125 		pr_info("cdev 0x%p, UP.\n", cdev);
2126 		break;
2127 	case CXGB4_STATE_START_RECOVERY:
2128 		pr_info("cdev 0x%p, RECOVERY.\n", cdev);
2129 		/* close all connections */
2130 		break;
2131 	case CXGB4_STATE_DOWN:
2132 		pr_info("cdev 0x%p, DOWN.\n", cdev);
2133 		break;
2134 	case CXGB4_STATE_DETACH:
2135 		pr_info("cdev 0x%p, DETACH.\n", cdev);
2136 		cxgbi_device_unregister(cdev);
2137 		break;
2138 	default:
2139 		pr_info("cdev 0x%p, unknown state %d.\n", cdev, state);
2140 		break;
2141 	}
2142 	return 0;
2143 }
2144 
2145 static int __init cxgb4i_init_module(void)
2146 {
2147 	int rc;
2148 
2149 	printk(KERN_INFO "%s", version);
2150 
2151 	rc = cxgbi_iscsi_init(&cxgb4i_iscsi_transport, &cxgb4i_stt);
2152 	if (rc < 0)
2153 		return rc;
2154 	cxgb4_register_uld(CXGB4_ULD_ISCSI, &cxgb4i_uld_info);
2155 
2156 	return 0;
2157 }
2158 
2159 static void __exit cxgb4i_exit_module(void)
2160 {
2161 	cxgb4_unregister_uld(CXGB4_ULD_ISCSI);
2162 	cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T4);
2163 	cxgbi_iscsi_cleanup(&cxgb4i_iscsi_transport, &cxgb4i_stt);
2164 }
2165 
2166 module_init(cxgb4i_init_module);
2167 module_exit(cxgb4i_exit_module);
2168