cxgb4i.c 45.0 KB
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/*
 * cxgb4i.c: Chelsio T4 iSCSI driver.
 *
 * Copyright (c) 2010 Chelsio Communications, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.
 *
 * Written by:	Karen Xie (kxie@chelsio.com)
 *		Rakesh Ranjan (rranjan@chelsio.com)
 */

#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <scsi/scsi_host.h>
#include <net/tcp.h>
#include <net/dst.h>
#include <linux/netdevice.h>

#include "t4_msg.h"
#include "cxgb4.h"
#include "cxgb4_uld.h"
#include "t4fw_api.h"
#include "l2t.h"
#include "cxgb4i.h"

static unsigned int dbg_level;

#include "../libcxgbi.h"

#define	DRV_MODULE_NAME		"cxgb4i"
#define DRV_MODULE_DESC		"Chelsio T4 iSCSI Driver"
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#define	DRV_MODULE_VERSION	"0.9.1"
#define	DRV_MODULE_RELDATE	"Aug. 2010"
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static char version[] =
	DRV_MODULE_DESC " " DRV_MODULE_NAME
	" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";

MODULE_AUTHOR("Chelsio Communications, Inc.");
MODULE_DESCRIPTION(DRV_MODULE_DESC);
MODULE_VERSION(DRV_MODULE_VERSION);
MODULE_LICENSE("GPL");

module_param(dbg_level, uint, 0644);
MODULE_PARM_DESC(dbg_level, "Debug flag (default=0)");

static int cxgb4i_rcv_win = 256 * 1024;
module_param(cxgb4i_rcv_win, int, 0644);
MODULE_PARM_DESC(cxgb4i_rcv_win, "TCP reveive window in bytes");

static int cxgb4i_snd_win = 128 * 1024;
module_param(cxgb4i_snd_win, int, 0644);
MODULE_PARM_DESC(cxgb4i_snd_win, "TCP send window in bytes");

static int cxgb4i_rx_credit_thres = 10 * 1024;
module_param(cxgb4i_rx_credit_thres, int, 0644);
MODULE_PARM_DESC(cxgb4i_rx_credit_thres,
		"RX credits return threshold in bytes (default=10KB)");

static unsigned int cxgb4i_max_connect = (8 * 1024);
module_param(cxgb4i_max_connect, uint, 0644);
MODULE_PARM_DESC(cxgb4i_max_connect, "Maximum number of connections");

static unsigned short cxgb4i_sport_base = 20000;
module_param(cxgb4i_sport_base, ushort, 0644);
MODULE_PARM_DESC(cxgb4i_sport_base, "Starting port number (default 20000)");

typedef void (*cxgb4i_cplhandler_func)(struct cxgbi_device *, struct sk_buff *);

static void *t4_uld_add(const struct cxgb4_lld_info *);
static int t4_uld_rx_handler(void *, const __be64 *, const struct pkt_gl *);
static int t4_uld_state_change(void *, enum cxgb4_state state);

static const struct cxgb4_uld_info cxgb4i_uld_info = {
	.name = DRV_MODULE_NAME,
	.add = t4_uld_add,
	.rx_handler = t4_uld_rx_handler,
	.state_change = t4_uld_state_change,
};

static struct scsi_host_template cxgb4i_host_template = {
	.module		= THIS_MODULE,
	.name		= DRV_MODULE_NAME,
	.proc_name	= DRV_MODULE_NAME,
	.can_queue	= CXGB4I_SCSI_HOST_QDEPTH,
	.queuecommand	= iscsi_queuecommand,
	.change_queue_depth = iscsi_change_queue_depth,
	.sg_tablesize	= SG_ALL,
	.max_sectors	= 0xFFFF,
	.cmd_per_lun	= ISCSI_DEF_CMD_PER_LUN,
	.eh_abort_handler = iscsi_eh_abort,
	.eh_device_reset_handler = iscsi_eh_device_reset,
	.eh_target_reset_handler = iscsi_eh_recover_target,
	.target_alloc	= iscsi_target_alloc,
	.use_clustering	= DISABLE_CLUSTERING,
	.this_id	= -1,
};

static struct iscsi_transport cxgb4i_iscsi_transport = {
	.owner		= THIS_MODULE,
	.name		= DRV_MODULE_NAME,
	.caps		= CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST |
				CAP_DATADGST | CAP_DIGEST_OFFLOAD |
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				CAP_PADDING_OFFLOAD | CAP_TEXT_NEGO,
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	.attr_is_visible	= cxgbi_attr_is_visible,
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	.get_host_param	= cxgbi_get_host_param,
	.set_host_param	= cxgbi_set_host_param,
	/* session management */
	.create_session	= cxgbi_create_session,
	.destroy_session	= cxgbi_destroy_session,
	.get_session_param = iscsi_session_get_param,
	/* connection management */
	.create_conn	= cxgbi_create_conn,
	.bind_conn		= cxgbi_bind_conn,
	.destroy_conn	= iscsi_tcp_conn_teardown,
	.start_conn		= iscsi_conn_start,
	.stop_conn		= iscsi_conn_stop,
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	.get_conn_param	= iscsi_conn_get_param,
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	.set_param	= cxgbi_set_conn_param,
	.get_stats	= cxgbi_get_conn_stats,
	/* pdu xmit req from user space */
	.send_pdu	= iscsi_conn_send_pdu,
	/* task */
	.init_task	= iscsi_tcp_task_init,
	.xmit_task	= iscsi_tcp_task_xmit,
	.cleanup_task	= cxgbi_cleanup_task,
	/* pdu */
	.alloc_pdu	= cxgbi_conn_alloc_pdu,
	.init_pdu	= cxgbi_conn_init_pdu,
	.xmit_pdu	= cxgbi_conn_xmit_pdu,
	.parse_pdu_itt	= cxgbi_parse_pdu_itt,
	/* TCP connect/disconnect */
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	.get_ep_param	= cxgbi_get_ep_param,
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	.ep_connect	= cxgbi_ep_connect,
	.ep_poll	= cxgbi_ep_poll,
	.ep_disconnect	= cxgbi_ep_disconnect,
	/* Error recovery timeout call */
	.session_recovery_timedout = iscsi_session_recovery_timedout,
};

static struct scsi_transport_template *cxgb4i_stt;

/*
 * CPL (Chelsio Protocol Language) defines a message passing interface between
 * the host driver and Chelsio asic.
 * The section below implments CPLs that related to iscsi tcp connection
 * open/close/abort and data send/receive.
 */
#define DIV_ROUND_UP(n, d)	(((n) + (d) - 1) / (d))
#define RCV_BUFSIZ_MASK		0x3FFU
#define MAX_IMM_TX_PKT_LEN	128

static inline void set_queue(struct sk_buff *skb, unsigned int queue,
				const struct cxgbi_sock *csk)
{
	skb->queue_mapping = queue;
}

static int push_tx_frames(struct cxgbi_sock *, int);

/*
 * is_ofld_imm - check whether a packet can be sent as immediate data
 * @skb: the packet
 *
 * Returns true if a packet can be sent as an offload WR with immediate
 * data.  We currently use the same limit as for Ethernet packets.
 */
static inline int is_ofld_imm(const struct sk_buff *skb)
{
	return skb->len <= (MAX_IMM_TX_PKT_LEN -
			sizeof(struct fw_ofld_tx_data_wr));
}

static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
				struct l2t_entry *e)
{
	struct cpl_act_open_req *req;
	int wscale = cxgbi_sock_compute_wscale(csk->mss_idx);
	unsigned long long opt0;
	unsigned int opt2;
	unsigned int qid_atid = ((unsigned int)csk->atid) |
				 (((unsigned int)csk->rss_qid) << 14);

	opt0 = KEEP_ALIVE(1) |
		WND_SCALE(wscale) |
		MSS_IDX(csk->mss_idx) |
		L2T_IDX(((struct l2t_entry *)csk->l2t)->idx) |
		TX_CHAN(csk->tx_chan) |
		SMAC_SEL(csk->smac_idx) |
		ULP_MODE(ULP_MODE_ISCSI) |
		RCV_BUFSIZ(cxgb4i_rcv_win >> 10);
	opt2 = RX_CHANNEL(0) |
		RSS_QUEUE_VALID |
		(1 << 20) | (1 << 22) |
		RSS_QUEUE(csk->rss_qid);

	set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id);
	req = (struct cpl_act_open_req *)skb->head;

	INIT_TP_WR(req, 0);
	OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
					qid_atid));
	req->local_port = csk->saddr.sin_port;
	req->peer_port = csk->daddr.sin_port;
	req->local_ip = csk->saddr.sin_addr.s_addr;
	req->peer_ip = csk->daddr.sin_addr.s_addr;
	req->opt0 = cpu_to_be64(opt0);
	req->params = 0;
	req->opt2 = cpu_to_be32(opt2);

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
		csk, &req->local_ip, ntohs(req->local_port),
		&req->peer_ip, ntohs(req->peer_port),
		csk->atid, csk->rss_qid);

	cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
}

static void send_close_req(struct cxgbi_sock *csk)
{
	struct sk_buff *skb = csk->cpl_close;
	struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
	unsigned int tid = csk->tid;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx, tid %u.\n",
		csk, csk->state, csk->flags, csk->tid);
	csk->cpl_close = NULL;
	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
	INIT_TP_WR(req, tid);
	OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
	req->rsvd = 0;

	cxgbi_sock_skb_entail(csk, skb);
	if (csk->state >= CTP_ESTABLISHED)
		push_tx_frames(csk, 1);
}

static void abort_arp_failure(void *handle, struct sk_buff *skb)
{
	struct cxgbi_sock *csk = (struct cxgbi_sock *)handle;
	struct cpl_abort_req *req;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx, tid %u, abort.\n",
		csk, csk->state, csk->flags, csk->tid);
	req = (struct cpl_abort_req *)skb->data;
	req->cmd = CPL_ABORT_NO_RST;
	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
}

static void send_abort_req(struct cxgbi_sock *csk)
{
	struct cpl_abort_req *req;
	struct sk_buff *skb = csk->cpl_abort_req;

	if (unlikely(csk->state == CTP_ABORTING) || !skb || !csk->cdev)
		return;
	cxgbi_sock_set_state(csk, CTP_ABORTING);
	cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
	cxgbi_sock_purge_write_queue(csk);

	csk->cpl_abort_req = NULL;
	req = (struct cpl_abort_req *)skb->head;
	set_queue(skb, CPL_PRIORITY_DATA, csk);
	req->cmd = CPL_ABORT_SEND_RST;
	t4_set_arp_err_handler(skb, csk, abort_arp_failure);
	INIT_TP_WR(req, csk->tid);
	OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
	req->rsvd0 = htonl(csk->snd_nxt);
	req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
		csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
		req->rsvd1);

	cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
}

static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
{
	struct sk_buff *skb = csk->cpl_abort_rpl;
	struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx,%u, status %d.\n",
		csk, csk->state, csk->flags, csk->tid, rst_status);

	csk->cpl_abort_rpl = NULL;
	set_queue(skb, CPL_PRIORITY_DATA, csk);
	INIT_TP_WR(rpl, csk->tid);
	OPCODE_TID(rpl) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
	rpl->cmd = rst_status;
	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
}

/*
 * CPL connection rx data ack: host ->
 * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
 * credits sent.
 */
static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
{
	struct sk_buff *skb;
	struct cpl_rx_data_ack *req;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
		"csk 0x%p,%u,0x%lx,%u, credit %u.\n",
		csk, csk->state, csk->flags, csk->tid, credits);

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	skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
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	if (!skb) {
		pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
		return 0;
	}
	req = (struct cpl_rx_data_ack *)skb->head;

	set_wr_txq(skb, CPL_PRIORITY_ACK, csk->port_id);
	INIT_TP_WR(req, csk->tid);
	OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
				      csk->tid));
	req->credit_dack = cpu_to_be32(RX_CREDITS(credits) | RX_FORCE_ACK(1));
	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
	return credits;
}

/*
 * sgl_len - calculates the size of an SGL of the given capacity
 * @n: the number of SGL entries
 * Calculates the number of flits needed for a scatter/gather list that
 * can hold the given number of entries.
 */
static inline unsigned int sgl_len(unsigned int n)
{
	n--;
	return (3 * n) / 2 + (n & 1) + 2;
}

/*
 * calc_tx_flits_ofld - calculate # of flits for an offload packet
 * @skb: the packet
 *
 * Returns the number of flits needed for the given offload packet.
 * These packets are already fully constructed and no additional headers
 * will be added.
 */
static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb)
{
	unsigned int flits, cnt;

	if (is_ofld_imm(skb))
		return DIV_ROUND_UP(skb->len, 8);
	flits = skb_transport_offset(skb) / 8;
	cnt = skb_shinfo(skb)->nr_frags;
	if (skb->tail != skb->transport_header)
		cnt++;
	return flits + sgl_len(cnt);
}

static inline void send_tx_flowc_wr(struct cxgbi_sock *csk)
{
	struct sk_buff *skb;
	struct fw_flowc_wr *flowc;
	int flowclen, i;

	flowclen = 80;
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	skb = alloc_wr(flowclen, 0, GFP_ATOMIC);
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	flowc = (struct fw_flowc_wr *)skb->head;
	flowc->op_to_nparams =
		htonl(FW_WR_OP(FW_FLOWC_WR) | FW_FLOWC_WR_NPARAMS(8));
	flowc->flowid_len16 =
		htonl(FW_WR_LEN16(DIV_ROUND_UP(72, 16)) |
				FW_WR_FLOWID(csk->tid));
	flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
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	flowc->mnemval[0].val = htonl(csk->cdev->pfvf);
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	flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
	flowc->mnemval[1].val = htonl(csk->tx_chan);
	flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
	flowc->mnemval[2].val = htonl(csk->tx_chan);
	flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
	flowc->mnemval[3].val = htonl(csk->rss_qid);
	flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
	flowc->mnemval[4].val = htonl(csk->snd_nxt);
	flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
	flowc->mnemval[5].val = htonl(csk->rcv_nxt);
	flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
	flowc->mnemval[6].val = htonl(cxgb4i_snd_win);
	flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
	flowc->mnemval[7].val = htonl(csk->advmss);
	flowc->mnemval[8].mnemonic = 0;
	flowc->mnemval[8].val = 0;
	for (i = 0; i < 9; i++) {
		flowc->mnemval[i].r4[0] = 0;
		flowc->mnemval[i].r4[1] = 0;
		flowc->mnemval[i].r4[2] = 0;
	}
	set_queue(skb, CPL_PRIORITY_DATA, csk);

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p, tid 0x%x, %u,%u,%u,%u,%u,%u,%u.\n",
		csk, csk->tid, 0, csk->tx_chan, csk->rss_qid,
		csk->snd_nxt, csk->rcv_nxt, cxgb4i_snd_win,
		csk->advmss);

	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
}

static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
				   int dlen, int len, u32 credits, int compl)
{
	struct fw_ofld_tx_data_wr *req;
	unsigned int submode = cxgbi_skcb_ulp_mode(skb) & 3;
	unsigned int wr_ulp_mode = 0;

	req = (struct fw_ofld_tx_data_wr *)__skb_push(skb, sizeof(*req));

	if (is_ofld_imm(skb)) {
		req->op_to_immdlen = htonl(FW_WR_OP(FW_OFLD_TX_DATA_WR) |
					FW_WR_COMPL(1) |
					FW_WR_IMMDLEN(dlen));
		req->flowid_len16 = htonl(FW_WR_FLOWID(csk->tid) |
						FW_WR_LEN16(credits));
	} else {
		req->op_to_immdlen =
			cpu_to_be32(FW_WR_OP(FW_OFLD_TX_DATA_WR) |
					FW_WR_COMPL(1) |
					FW_WR_IMMDLEN(0));
		req->flowid_len16 =
			cpu_to_be32(FW_WR_FLOWID(csk->tid) |
					FW_WR_LEN16(credits));
	}
	if (submode)
		wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE(ULP2_MODE_ISCSI) |
				FW_OFLD_TX_DATA_WR_ULPSUBMODE(submode);
	req->tunnel_to_proxy = htonl(wr_ulp_mode) |
		 FW_OFLD_TX_DATA_WR_SHOVE(skb_peek(&csk->write_queue) ? 0 : 1);
	req->plen = htonl(len);
	if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT))
		cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
}

static void arp_failure_skb_discard(void *handle, struct sk_buff *skb)
{
	kfree_skb(skb);
}

static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
{
	int total_size = 0;
	struct sk_buff *skb;

	if (unlikely(csk->state < CTP_ESTABLISHED ||
		csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK |
			 1 << CXGBI_DBG_PDU_TX,
			"csk 0x%p,%u,0x%lx,%u, in closing state.\n",
			csk, csk->state, csk->flags, csk->tid);
		return 0;
	}

	while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
		int dlen = skb->len;
		int len = skb->len;
		unsigned int credits_needed;

		skb_reset_transport_header(skb);
		if (is_ofld_imm(skb))
			credits_needed = DIV_ROUND_UP(dlen +
					sizeof(struct fw_ofld_tx_data_wr), 16);
		else
			credits_needed = DIV_ROUND_UP(8*calc_tx_flits_ofld(skb)
					+ sizeof(struct fw_ofld_tx_data_wr),
					16);

		if (csk->wr_cred < credits_needed) {
			log_debug(1 << CXGBI_DBG_PDU_TX,
				"csk 0x%p, skb %u/%u, wr %d < %u.\n",
				csk, skb->len, skb->data_len,
				credits_needed, csk->wr_cred);
			break;
		}
		__skb_unlink(skb, &csk->write_queue);
		set_queue(skb, CPL_PRIORITY_DATA, csk);
		skb->csum = credits_needed;
		csk->wr_cred -= credits_needed;
		csk->wr_una_cred += credits_needed;
		cxgbi_sock_enqueue_wr(csk, skb);

		log_debug(1 << CXGBI_DBG_PDU_TX,
			"csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n",
			csk, skb->len, skb->data_len, credits_needed,
			csk->wr_cred, csk->wr_una_cred);

		if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
			if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
				send_tx_flowc_wr(csk);
				skb->csum += 5;
				csk->wr_cred -= 5;
				csk->wr_una_cred += 5;
			}
			len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
			make_tx_data_wr(csk, skb, dlen, len, credits_needed,
					req_completion);
			csk->snd_nxt += len;
			cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
		}
		total_size += skb->truesize;
		t4_set_arp_err_handler(skb, csk, arp_failure_skb_discard);

		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
			"csk 0x%p,%u,0x%lx,%u, skb 0x%p, %u.\n",
			csk, csk->state, csk->flags, csk->tid, skb, len);

		cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
	}
	return total_size;
}

static inline void free_atid(struct cxgbi_sock *csk)
{
	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);

	if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
		cxgb4_free_atid(lldi->tids, csk->atid);
		cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
		cxgbi_sock_put(csk);
	}
}

static void do_act_establish(struct cxgbi_device *cdev, struct sk_buff *skb)
{
	struct cxgbi_sock *csk;
	struct cpl_act_establish *req = (struct cpl_act_establish *)skb->data;
	unsigned short tcp_opt = ntohs(req->tcp_opt);
	unsigned int tid = GET_TID(req);
	unsigned int atid = GET_TID_TID(ntohl(req->tos_atid));
	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
	struct tid_info *t = lldi->tids;
	u32 rcv_isn = be32_to_cpu(req->rcv_isn);

	csk = lookup_atid(t, atid);
	if (unlikely(!csk)) {
		pr_err("NO conn. for atid %u, cdev 0x%p.\n", atid, cdev);
		goto rel_skb;
	}

553 554 555 556 557 558
	if (csk->atid != atid) {
		pr_err("bad conn atid %u, csk 0x%p,%u,0x%lx,tid %u, atid %u.\n",
			atid, csk, csk->state, csk->flags, csk->tid, csk->atid);
		goto rel_skb;
	}

559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641
	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx, tid %u, atid %u, rseq %u.\n",
		csk, csk->state, csk->flags, tid, atid, rcv_isn);

	cxgbi_sock_get(csk);
	csk->tid = tid;
	cxgb4_insert_tid(lldi->tids, csk, tid);
	cxgbi_sock_set_flag(csk, CTPF_HAS_TID);

	free_atid(csk);

	spin_lock_bh(&csk->lock);
	if (unlikely(csk->state != CTP_ACTIVE_OPEN))
		pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
			csk, csk->state, csk->flags, csk->tid);

	if (csk->retry_timer.function) {
		del_timer(&csk->retry_timer);
		csk->retry_timer.function = NULL;
	}

	csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
	/*
	 * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
	 * pass through opt0.
	 */
	if (cxgb4i_rcv_win > (RCV_BUFSIZ_MASK << 10))
		csk->rcv_wup -= cxgb4i_rcv_win - (RCV_BUFSIZ_MASK << 10);

	csk->advmss = lldi->mtus[GET_TCPOPT_MSS(tcp_opt)] - 40;
	if (GET_TCPOPT_TSTAMP(tcp_opt))
		csk->advmss -= 12;
	if (csk->advmss < 128)
		csk->advmss = 128;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p, mss_idx %u, advmss %u.\n",
			csk, GET_TCPOPT_MSS(tcp_opt), csk->advmss);

	cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));

	if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
		send_abort_req(csk);
	else {
		if (skb_queue_len(&csk->write_queue))
			push_tx_frames(csk, 0);
		cxgbi_conn_tx_open(csk);
	}
	spin_unlock_bh(&csk->lock);

rel_skb:
	__kfree_skb(skb);
}

static int act_open_rpl_status_to_errno(int status)
{
	switch (status) {
	case CPL_ERR_CONN_RESET:
		return -ECONNREFUSED;
	case CPL_ERR_ARP_MISS:
		return -EHOSTUNREACH;
	case CPL_ERR_CONN_TIMEDOUT:
		return -ETIMEDOUT;
	case CPL_ERR_TCAM_FULL:
		return -ENOMEM;
	case CPL_ERR_CONN_EXIST:
		return -EADDRINUSE;
	default:
		return -EIO;
	}
}

static void csk_act_open_retry_timer(unsigned long data)
{
	struct sk_buff *skb;
	struct cxgbi_sock *csk = (struct cxgbi_sock *)data;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx,%u.\n",
		csk, csk->state, csk->flags, csk->tid);

	cxgbi_sock_get(csk);
	spin_lock_bh(&csk->lock);
642
	skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_ATOMIC);
643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671
	if (!skb)
		cxgbi_sock_fail_act_open(csk, -ENOMEM);
	else {
		skb->sk = (struct sock *)csk;
		t4_set_arp_err_handler(skb, csk,
					cxgbi_sock_act_open_req_arp_failure);
		send_act_open_req(csk, skb, csk->l2t);
	}
	spin_unlock_bh(&csk->lock);
	cxgbi_sock_put(csk);
}

static void do_act_open_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
{
	struct cxgbi_sock *csk;
	struct cpl_act_open_rpl *rpl = (struct cpl_act_open_rpl *)skb->data;
	unsigned int tid = GET_TID(rpl);
	unsigned int atid =
		GET_TID_TID(GET_AOPEN_ATID(be32_to_cpu(rpl->atid_status)));
	unsigned int status = GET_AOPEN_STATUS(be32_to_cpu(rpl->atid_status));
	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
	struct tid_info *t = lldi->tids;

	csk = lookup_atid(t, atid);
	if (unlikely(!csk)) {
		pr_err("NO matching conn. atid %u, tid %u.\n", atid, tid);
		goto rel_skb;
	}

672 673 674 675
	pr_info("%pI4:%u-%pI4:%u, atid %u,%u, status %u, csk 0x%p,%u,0x%lx.\n",
		&csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
		&csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port),
		atid, tid, status, csk, csk->state, csk->flags);
676

677 678 679
	if (status == CPL_ERR_RTX_NEG_ADVICE)
		goto rel_skb;

680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865
	if (status && status != CPL_ERR_TCAM_FULL &&
	    status != CPL_ERR_CONN_EXIST &&
	    status != CPL_ERR_ARP_MISS)
		cxgb4_remove_tid(lldi->tids, csk->port_id, GET_TID(rpl));

	cxgbi_sock_get(csk);
	spin_lock_bh(&csk->lock);

	if (status == CPL_ERR_CONN_EXIST &&
	    csk->retry_timer.function != csk_act_open_retry_timer) {
		csk->retry_timer.function = csk_act_open_retry_timer;
		mod_timer(&csk->retry_timer, jiffies + HZ / 2);
	} else
		cxgbi_sock_fail_act_open(csk,
					act_open_rpl_status_to_errno(status));

	spin_unlock_bh(&csk->lock);
	cxgbi_sock_put(csk);
rel_skb:
	__kfree_skb(skb);
}

static void do_peer_close(struct cxgbi_device *cdev, struct sk_buff *skb)
{
	struct cxgbi_sock *csk;
	struct cpl_peer_close *req = (struct cpl_peer_close *)skb->data;
	unsigned int tid = GET_TID(req);
	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
	struct tid_info *t = lldi->tids;

	csk = lookup_tid(t, tid);
	if (unlikely(!csk)) {
		pr_err("can't find connection for tid %u.\n", tid);
		goto rel_skb;
	}
	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx,%u.\n",
		csk, csk->state, csk->flags, csk->tid);
	cxgbi_sock_rcv_peer_close(csk);
rel_skb:
	__kfree_skb(skb);
}

static void do_close_con_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
{
	struct cxgbi_sock *csk;
	struct cpl_close_con_rpl *rpl = (struct cpl_close_con_rpl *)skb->data;
	unsigned int tid = GET_TID(rpl);
	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
	struct tid_info *t = lldi->tids;

	csk = lookup_tid(t, tid);
	if (unlikely(!csk)) {
		pr_err("can't find connection for tid %u.\n", tid);
		goto rel_skb;
	}
	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx,%u.\n",
		csk, csk->state, csk->flags, csk->tid);
	cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
rel_skb:
	__kfree_skb(skb);
}

static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
								int *need_rst)
{
	switch (abort_reason) {
	case CPL_ERR_BAD_SYN: /* fall through */
	case CPL_ERR_CONN_RESET:
		return csk->state > CTP_ESTABLISHED ?
			-EPIPE : -ECONNRESET;
	case CPL_ERR_XMIT_TIMEDOUT:
	case CPL_ERR_PERSIST_TIMEDOUT:
	case CPL_ERR_FINWAIT2_TIMEDOUT:
	case CPL_ERR_KEEPALIVE_TIMEDOUT:
		return -ETIMEDOUT;
	default:
		return -EIO;
	}
}

static void do_abort_req_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
{
	struct cxgbi_sock *csk;
	struct cpl_abort_req_rss *req = (struct cpl_abort_req_rss *)skb->data;
	unsigned int tid = GET_TID(req);
	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
	struct tid_info *t = lldi->tids;
	int rst_status = CPL_ABORT_NO_RST;

	csk = lookup_tid(t, tid);
	if (unlikely(!csk)) {
		pr_err("can't find connection for tid %u.\n", tid);
		goto rel_skb;
	}

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx, tid %u, status 0x%x.\n",
		csk, csk->state, csk->flags, csk->tid, req->status);

	if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
	    req->status == CPL_ERR_PERSIST_NEG_ADVICE)
		goto rel_skb;

	cxgbi_sock_get(csk);
	spin_lock_bh(&csk->lock);

	if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
		cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
		cxgbi_sock_set_state(csk, CTP_ABORTING);
		goto done;
	}

	cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
	send_abort_rpl(csk, rst_status);

	if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
		csk->err = abort_status_to_errno(csk, req->status, &rst_status);
		cxgbi_sock_closed(csk);
	}
done:
	spin_unlock_bh(&csk->lock);
	cxgbi_sock_put(csk);
rel_skb:
	__kfree_skb(skb);
}

static void do_abort_rpl_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
{
	struct cxgbi_sock *csk;
	struct cpl_abort_rpl_rss *rpl = (struct cpl_abort_rpl_rss *)skb->data;
	unsigned int tid = GET_TID(rpl);
	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
	struct tid_info *t = lldi->tids;

	csk = lookup_tid(t, tid);
	if (!csk)
		goto rel_skb;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
		rpl->status, csk, csk ? csk->state : 0,
		csk ? csk->flags : 0UL);

	if (rpl->status == CPL_ERR_ABORT_FAILED)
		goto rel_skb;

	cxgbi_sock_rcv_abort_rpl(csk);
rel_skb:
	__kfree_skb(skb);
}

static void do_rx_iscsi_hdr(struct cxgbi_device *cdev, struct sk_buff *skb)
{
	struct cxgbi_sock *csk;
	struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
	unsigned short pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);
	unsigned int tid = GET_TID(cpl);
	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
	struct tid_info *t = lldi->tids;

	csk = lookup_tid(t, tid);
	if (unlikely(!csk)) {
		pr_err("can't find conn. for tid %u.\n", tid);
		goto rel_skb;
	}

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
		"csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
		csk, csk->state, csk->flags, csk->tid, skb, skb->len,
		pdu_len_ddp);

	spin_lock_bh(&csk->lock);

	if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
			"csk 0x%p,%u,0x%lx,%u, bad state.\n",
			csk, csk->state, csk->flags, csk->tid);
		if (csk->state != CTP_ABORTING)
			goto abort_conn;
		else
			goto discard;
	}

	cxgbi_skcb_tcp_seq(skb) = ntohl(cpl->seq);
866 867
	cxgbi_skcb_flags(skb) = 0;

868 869 870 871 872 873 874 875 876 877 878 879
	skb_reset_transport_header(skb);
	__skb_pull(skb, sizeof(*cpl));
	__pskb_trim(skb, ntohs(cpl->len));

	if (!csk->skb_ulp_lhdr) {
		unsigned char *bhs;
		unsigned int hlen, dlen;

		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
			"csk 0x%p,%u,0x%lx, tid %u, skb 0x%p header.\n",
			csk, csk->state, csk->flags, csk->tid, skb);
		csk->skb_ulp_lhdr = skb;
880
		cxgbi_skcb_set_flag(skb, SKCBF_RX_HDR);
881

882
		if (cxgbi_skcb_tcp_seq(skb) != csk->rcv_nxt) {
883
			pr_info("tid %u, CPL_ISCSI_HDR, bad seq, 0x%x/0x%x.\n",
884
				csk->tid, cxgbi_skcb_tcp_seq(skb),
885 886 887 888
				csk->rcv_nxt);
			goto abort_conn;
		}

889
		bhs = skb->data;
890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912
		hlen = ntohs(cpl->len);
		dlen = ntohl(*(unsigned int *)(bhs + 4)) & 0xFFFFFF;

		if ((hlen + dlen) != ISCSI_PDU_LEN(pdu_len_ddp) - 40) {
			pr_info("tid 0x%x, CPL_ISCSI_HDR, pdu len "
				"mismatch %u != %u + %u, seq 0x%x.\n",
				csk->tid, ISCSI_PDU_LEN(pdu_len_ddp) - 40,
				hlen, dlen, cxgbi_skcb_tcp_seq(skb));
			goto abort_conn;
		}

		cxgbi_skcb_rx_pdulen(skb) = (hlen + dlen + 3) & (~0x3);
		if (dlen)
			cxgbi_skcb_rx_pdulen(skb) += csk->dcrc_len;
		csk->rcv_nxt += cxgbi_skcb_rx_pdulen(skb);

		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
			"csk 0x%p, skb 0x%p, 0x%x,%u+%u,0x%x,0x%x.\n",
			csk, skb, *bhs, hlen, dlen,
			ntohl(*((unsigned int *)(bhs + 16))),
			ntohl(*((unsigned int *)(bhs + 24))));

	} else {
913
		struct sk_buff *lskb = csk->skb_ulp_lhdr;
914

915
		cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);
916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980
		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
			"csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
			csk, csk->state, csk->flags, skb, lskb);
	}

	__skb_queue_tail(&csk->receive_queue, skb);
	spin_unlock_bh(&csk->lock);
	return;

abort_conn:
	send_abort_req(csk);
discard:
	spin_unlock_bh(&csk->lock);
rel_skb:
	__kfree_skb(skb);
}

static void do_rx_data_ddp(struct cxgbi_device *cdev,
				  struct sk_buff *skb)
{
	struct cxgbi_sock *csk;
	struct sk_buff *lskb;
	struct cpl_rx_data_ddp *rpl = (struct cpl_rx_data_ddp *)skb->data;
	unsigned int tid = GET_TID(rpl);
	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
	struct tid_info *t = lldi->tids;
	unsigned int status = ntohl(rpl->ddpvld);

	csk = lookup_tid(t, tid);
	if (unlikely(!csk)) {
		pr_err("can't find connection for tid %u.\n", tid);
		goto rel_skb;
	}

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
		"csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p.\n",
		csk, csk->state, csk->flags, skb, status, csk->skb_ulp_lhdr);

	spin_lock_bh(&csk->lock);

	if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
			"csk 0x%p,%u,0x%lx,%u, bad state.\n",
			csk, csk->state, csk->flags, csk->tid);
		if (csk->state != CTP_ABORTING)
			goto abort_conn;
		else
			goto discard;
	}

	if (!csk->skb_ulp_lhdr) {
		pr_err("tid 0x%x, rcv RX_DATA_DDP w/o pdu bhs.\n", csk->tid);
		goto abort_conn;
	}

	lskb = csk->skb_ulp_lhdr;
	csk->skb_ulp_lhdr = NULL;

	cxgbi_skcb_rx_ddigest(lskb) = ntohl(rpl->ulp_crc);

	if (ntohs(rpl->len) != cxgbi_skcb_rx_pdulen(lskb))
		pr_info("tid 0x%x, RX_DATA_DDP pdulen %u != %u.\n",
			csk->tid, ntohs(rpl->len), cxgbi_skcb_rx_pdulen(lskb));

	if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT)) {
981 982
		pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, hcrc bad 0x%lx.\n",
			csk, lskb, status, cxgbi_skcb_flags(lskb));
983 984 985
		cxgbi_skcb_set_flag(lskb, SKCBF_RX_HCRC_ERR);
	}
	if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT)) {
986 987
		pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, dcrc bad 0x%lx.\n",
			csk, lskb, status, cxgbi_skcb_flags(lskb));
988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006
		cxgbi_skcb_set_flag(lskb, SKCBF_RX_DCRC_ERR);
	}
	if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT)) {
		log_debug(1 << CXGBI_DBG_PDU_RX,
			"csk 0x%p, lhdr 0x%p, status 0x%x, pad bad.\n",
			csk, lskb, status);
		cxgbi_skcb_set_flag(lskb, SKCBF_RX_PAD_ERR);
	}
	if ((status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT)) &&
		!cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA)) {
		log_debug(1 << CXGBI_DBG_PDU_RX,
			"csk 0x%p, lhdr 0x%p, 0x%x, data ddp'ed.\n",
			csk, lskb, status);
		cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA_DDPD);
	}
	log_debug(1 << CXGBI_DBG_PDU_RX,
		"csk 0x%p, lskb 0x%p, f 0x%lx.\n",
		csk, lskb, cxgbi_skcb_flags(lskb));

1007
	cxgbi_skcb_set_flag(lskb, SKCBF_RX_STATUS);
1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065
	cxgbi_conn_pdu_ready(csk);
	spin_unlock_bh(&csk->lock);
	goto rel_skb;

abort_conn:
	send_abort_req(csk);
discard:
	spin_unlock_bh(&csk->lock);
rel_skb:
	__kfree_skb(skb);
}

static void do_fw4_ack(struct cxgbi_device *cdev, struct sk_buff *skb)
{
	struct cxgbi_sock *csk;
	struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)skb->data;
	unsigned int tid = GET_TID(rpl);
	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
	struct tid_info *t = lldi->tids;

	csk = lookup_tid(t, tid);
	if (unlikely(!csk))
		pr_err("can't find connection for tid %u.\n", tid);
	else {
		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
			"csk 0x%p,%u,0x%lx,%u.\n",
			csk, csk->state, csk->flags, csk->tid);
		cxgbi_sock_rcv_wr_ack(csk, rpl->credits, ntohl(rpl->snd_una),
					rpl->seq_vld);
	}
	__kfree_skb(skb);
}

static void do_set_tcb_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
{
	struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
	unsigned int tid = GET_TID(rpl);
	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
	struct tid_info *t = lldi->tids;
	struct cxgbi_sock *csk;

	csk = lookup_tid(t, tid);
	if (!csk)
		pr_err("can't find conn. for tid %u.\n", tid);

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,%lx,%u, status 0x%x.\n",
		csk, csk->state, csk->flags, csk->tid, rpl->status);

	if (rpl->status != CPL_ERR_NONE)
		pr_err("csk 0x%p,%u, SET_TCB_RPL status %u.\n",
			csk, tid, rpl->status);

	__kfree_skb(skb);
}

static int alloc_cpls(struct cxgbi_sock *csk)
{
1066 1067
	csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req),
					0, GFP_KERNEL);
1068 1069 1070
	if (!csk->cpl_close)
		return -ENOMEM;

1071 1072
	csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req),
					0, GFP_KERNEL);
1073 1074 1075
	if (!csk->cpl_abort_req)
		goto free_cpls;

1076 1077
	csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl),
					0, GFP_KERNEL);
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
	if (!csk->cpl_abort_rpl)
		goto free_cpls;
	return 0;

free_cpls:
	cxgbi_sock_free_cpl_skbs(csk);
	return -ENOMEM;
}

static inline void l2t_put(struct cxgbi_sock *csk)
{
	if (csk->l2t) {
		cxgb4_l2t_release(csk->l2t);
		csk->l2t = NULL;
		cxgbi_sock_put(csk);
	}
}

static void release_offload_resources(struct cxgbi_sock *csk)
{
	struct cxgb4_lld_info *lldi;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx,%u.\n",
		csk, csk->state, csk->flags, csk->tid);

	cxgbi_sock_free_cpl_skbs(csk);
	if (csk->wr_cred != csk->wr_max_cred) {
		cxgbi_sock_purge_wr_queue(csk);
		cxgbi_sock_reset_wr_list(csk);
	}

	l2t_put(csk);
	if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
		free_atid(csk);
	else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
		lldi = cxgbi_cdev_priv(csk->cdev);
		cxgb4_remove_tid(lldi->tids, 0, csk->tid);
		cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
		cxgbi_sock_put(csk);
	}
	csk->dst = NULL;
	csk->cdev = NULL;
}

static int init_act_open(struct cxgbi_sock *csk)
{
	struct cxgbi_device *cdev = csk->cdev;
	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
	struct net_device *ndev = cdev->ports[csk->port_id];
	struct port_info *pi = netdev_priv(ndev);
	struct sk_buff *skb = NULL;
1130
	struct neighbour *n;
1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144
	unsigned int step;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx,%u.\n",
		csk, csk->state, csk->flags, csk->tid);

	csk->atid = cxgb4_alloc_atid(lldi->tids, csk);
	if (csk->atid < 0) {
		pr_err("%s, NO atid available.\n", ndev->name);
		return -EINVAL;
	}
	cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
	cxgbi_sock_get(csk);

1145 1146 1147 1148 1149 1150
	n = dst_get_neighbour_noref(csk->dst);
	if (!n) {
		pr_err("%s, can't get neighbour of csk->dst.\n", ndev->name);
		goto rel_resource;
	}
	csk->l2t = cxgb4_l2t_get(lldi->l2t, n, ndev, 0);
1151 1152 1153 1154 1155 1156
	if (!csk->l2t) {
		pr_err("%s, cannot alloc l2t.\n", ndev->name);
		goto rel_resource;
	}
	cxgbi_sock_get(csk);

1157
	skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL);
1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232
	if (!skb)
		goto rel_resource;
	skb->sk = (struct sock *)csk;
	t4_set_arp_err_handler(skb, csk, cxgbi_sock_act_open_req_arp_failure);

	if (!csk->mtu)
		csk->mtu = dst_mtu(csk->dst);
	cxgb4_best_mtu(lldi->mtus, csk->mtu, &csk->mss_idx);
	csk->tx_chan = cxgb4_port_chan(ndev);
	/* SMT two entries per row */
	csk->smac_idx = ((cxgb4_port_viid(ndev) & 0x7F)) << 1;
	step = lldi->ntxq / lldi->nchan;
	csk->txq_idx = cxgb4_port_idx(ndev) * step;
	step = lldi->nrxq / lldi->nchan;
	csk->rss_qid = lldi->rxq_ids[cxgb4_port_idx(ndev) * step];
	csk->wr_max_cred = csk->wr_cred = lldi->wr_cred;
	csk->wr_una_cred = 0;
	cxgbi_sock_reset_wr_list(csk);
	csk->err = 0;
	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,p%d,%s, %u,%u,%u, mss %u,%u, smac %u.\n",
		csk, pi->port_id, ndev->name, csk->tx_chan,
		csk->txq_idx, csk->rss_qid, csk->mtu, csk->mss_idx,
		csk->smac_idx);

	cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
	send_act_open_req(csk, skb, csk->l2t);
	return 0;

rel_resource:
	if (skb)
		__kfree_skb(skb);
	return -EINVAL;
}

cxgb4i_cplhandler_func cxgb4i_cplhandlers[NUM_CPL_CMDS] = {
	[CPL_ACT_ESTABLISH] = do_act_establish,
	[CPL_ACT_OPEN_RPL] = do_act_open_rpl,
	[CPL_PEER_CLOSE] = do_peer_close,
	[CPL_ABORT_REQ_RSS] = do_abort_req_rss,
	[CPL_ABORT_RPL_RSS] = do_abort_rpl_rss,
	[CPL_CLOSE_CON_RPL] = do_close_con_rpl,
	[CPL_FW4_ACK] = do_fw4_ack,
	[CPL_ISCSI_HDR] = do_rx_iscsi_hdr,
	[CPL_SET_TCB_RPL] = do_set_tcb_rpl,
	[CPL_RX_DATA_DDP] = do_rx_data_ddp,
};

int cxgb4i_ofld_init(struct cxgbi_device *cdev)
{
	int rc;

	if (cxgb4i_max_connect > CXGB4I_MAX_CONN)
		cxgb4i_max_connect = CXGB4I_MAX_CONN;

	rc = cxgbi_device_portmap_create(cdev, cxgb4i_sport_base,
					cxgb4i_max_connect);
	if (rc < 0)
		return rc;

	cdev->csk_release_offload_resources = release_offload_resources;
	cdev->csk_push_tx_frames = push_tx_frames;
	cdev->csk_send_abort_req = send_abort_req;
	cdev->csk_send_close_req = send_close_req;
	cdev->csk_send_rx_credits = send_rx_credits;
	cdev->csk_alloc_cpls = alloc_cpls;
	cdev->csk_init_act_open = init_act_open;

	pr_info("cdev 0x%p, offload up, added.\n", cdev);
	return 0;
}

/*
 * functions to program the pagepod in h/w
 */
1233
#define ULPMEM_IDATA_MAX_NPPODS	4 /* 256/PPOD_SIZE */
1234
static inline void ulp_mem_io_set_hdr(struct ulp_mem_io *req,
1235 1236
				unsigned int wr_len, unsigned int dlen,
				unsigned int pm_addr)
1237
{
1238
	struct ulptx_idata *idata = (struct ulptx_idata *)(req + 1);
1239 1240

	INIT_ULPTX_WR(req, wr_len, 0, 0);
1241
	req->cmd = htonl(ULPTX_CMD(ULP_TX_MEM_WRITE) | (1 << 23));
1242 1243 1244
	req->dlen = htonl(ULP_MEMIO_DATA_LEN(dlen >> 5));
	req->lock_addr = htonl(ULP_MEMIO_ADDR(pm_addr >> 5));
	req->len16 = htonl(DIV_ROUND_UP(wr_len - sizeof(req->wr), 16));
1245 1246 1247

	idata->cmd_more = htonl(ULPTX_CMD(ULP_TX_SC_IMM));
	idata->len = htonl(dlen);
1248 1249
}

1250
static int ddp_ppod_write_idata(struct cxgbi_device *cdev, unsigned int port_id,
1251 1252 1253 1254 1255 1256 1257 1258
				struct cxgbi_pagepod_hdr *hdr, unsigned int idx,
				unsigned int npods,
				struct cxgbi_gather_list *gl,
				unsigned int gl_pidx)
{
	struct cxgbi_ddp_info *ddp = cdev->ddp;
	struct sk_buff *skb;
	struct ulp_mem_io *req;
1259
	struct ulptx_idata *idata;
1260
	struct cxgbi_pagepod *ppod;
1261 1262 1263 1264
	unsigned int pm_addr = idx * PPOD_SIZE + ddp->llimit;
	unsigned int dlen = PPOD_SIZE * npods;
	unsigned int wr_len = roundup(sizeof(struct ulp_mem_io) +
				sizeof(struct ulptx_idata) + dlen, 16);
1265 1266
	unsigned int i;

1267
	skb = alloc_wr(wr_len, 0, GFP_ATOMIC);
1268 1269 1270 1271 1272 1273 1274 1275
	if (!skb) {
		pr_err("cdev 0x%p, idx %u, npods %u, OOM.\n",
			cdev, idx, npods);
		return -ENOMEM;
	}
	req = (struct ulp_mem_io *)skb->head;
	set_queue(skb, CPL_PRIORITY_CONTROL, NULL);

1276 1277 1278
	ulp_mem_io_set_hdr(req, wr_len, dlen, pm_addr);
	idata = (struct ulptx_idata *)(req + 1);
	ppod = (struct cxgbi_pagepod *)(idata + 1);
1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299

	for (i = 0; i < npods; i++, ppod++, gl_pidx += PPOD_PAGES_MAX) {
		if (!hdr && !gl)
			cxgbi_ddp_ppod_clear(ppod);
		else
			cxgbi_ddp_ppod_set(ppod, hdr, gl, gl_pidx);
	}

	cxgb4_ofld_send(cdev->ports[port_id], skb);
	return 0;
}

static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
			unsigned int idx, unsigned int npods,
			struct cxgbi_gather_list *gl)
{
	unsigned int i, cnt;
	int err = 0;

	for (i = 0; i < npods; i += cnt, idx += cnt) {
		cnt = npods - i;
1300 1301 1302
		if (cnt > ULPMEM_IDATA_MAX_NPPODS)
			cnt = ULPMEM_IDATA_MAX_NPPODS;
		err = ddp_ppod_write_idata(csk->cdev, csk->port_id, hdr,
1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317
					idx, cnt, gl, 4 * i);
		if (err < 0)
			break;
	}
	return err;
}

static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
			  unsigned int idx, unsigned int npods)
{
	unsigned int i, cnt;
	int err;

	for (i = 0; i < npods; i += cnt, idx += cnt) {
		cnt = npods - i;
1318 1319 1320
		if (cnt > ULPMEM_IDATA_MAX_NPPODS)
			cnt = ULPMEM_IDATA_MAX_NPPODS;
		err = ddp_ppod_write_idata(chba->cdev, chba->port_id, NULL,
1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332
					idx, cnt, NULL, 0);
		if (err < 0)
			break;
	}
}

static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk, unsigned int tid,
				int pg_idx, bool reply)
{
	struct sk_buff *skb;
	struct cpl_set_tcb_field *req;

1333
	if (!pg_idx || pg_idx >= DDP_PGIDX_MAX)
1334 1335
		return 0;

1336
	skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1337 1338 1339
	if (!skb)
		return -ENOMEM;

1340
	/*  set up ulp page size */
1341 1342 1343 1344
	req = (struct cpl_set_tcb_field *)skb->head;
	INIT_TP_WR(req, csk->tid);
	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
	req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1345 1346 1347
	req->word_cookie = htons(0);
	req->mask = cpu_to_be64(0x3 << 8);
	req->val = cpu_to_be64(pg_idx << 8);
1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362
	set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p, tid 0x%x, pg_idx %u.\n", csk, csk->tid, pg_idx);

	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
	return 0;
}

static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
				 int hcrc, int dcrc, int reply)
{
	struct sk_buff *skb;
	struct cpl_set_tcb_field *req;

1363 1364
	if (!hcrc && !dcrc)
		return 0;
1365

1366
	skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1367 1368 1369 1370 1371
	if (!skb)
		return -ENOMEM;

	csk->hcrc_len = (hcrc ? 4 : 0);
	csk->dcrc_len = (dcrc ? 4 : 0);
1372
	/*  set up ulp submode */
1373 1374 1375 1376
	req = (struct cpl_set_tcb_field *)skb->head;
	INIT_TP_WR(req, tid);
	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
	req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1377 1378 1379 1380
	req->word_cookie = htons(0);
	req->mask = cpu_to_be64(0x3 << 4);
	req->val = cpu_to_be64(((hcrc ? ULP_CRC_HEADER : 0) |
				(dcrc ? ULP_CRC_DATA : 0)) << 4);
1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468
	set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p, tid 0x%x, crc %d,%d.\n", csk, csk->tid, hcrc, dcrc);

	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
	return 0;
}

static int cxgb4i_ddp_init(struct cxgbi_device *cdev)
{
	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
	struct cxgbi_ddp_info *ddp = cdev->ddp;
	unsigned int tagmask, pgsz_factor[4];
	int err;

	if (ddp) {
		kref_get(&ddp->refcnt);
		pr_warn("cdev 0x%p, ddp 0x%p already set up.\n",
			cdev, cdev->ddp);
		return -EALREADY;
	}

	err = cxgbi_ddp_init(cdev, lldi->vr->iscsi.start,
			lldi->vr->iscsi.start + lldi->vr->iscsi.size - 1,
			lldi->iscsi_iolen, lldi->iscsi_iolen);
	if (err < 0)
		return err;

	ddp = cdev->ddp;

	tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
	cxgbi_ddp_page_size_factor(pgsz_factor);
	cxgb4_iscsi_init(lldi->ports[0], tagmask, pgsz_factor);

	cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
	cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
	cdev->csk_ddp_set = ddp_set_map;
	cdev->csk_ddp_clear = ddp_clear_map;

	pr_info("cxgb4i 0x%p tag: sw %u, rsvd %u,%u, mask 0x%x.\n",
		cdev, cdev->tag_format.sw_bits, cdev->tag_format.rsvd_bits,
		cdev->tag_format.rsvd_shift, cdev->tag_format.rsvd_mask);
	pr_info("cxgb4i 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
		" %u/%u.\n",
		cdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
		ddp->rsvd_tag_mask, ddp->max_txsz, lldi->iscsi_iolen,
		ddp->max_rxsz, lldi->iscsi_iolen);
	pr_info("cxgb4i 0x%p max payload size: %u/%u, %u/%u.\n",
		cdev, cdev->tx_max_size, ddp->max_txsz, cdev->rx_max_size,
		ddp->max_rxsz);
	return 0;
}

static void *t4_uld_add(const struct cxgb4_lld_info *lldi)
{
	struct cxgbi_device *cdev;
	struct port_info *pi;
	int i, rc;

	cdev = cxgbi_device_register(sizeof(*lldi), lldi->nports);
	if (!cdev) {
		pr_info("t4 device 0x%p, register failed.\n", lldi);
		return NULL;
	}
	pr_info("0x%p,0x%x, ports %u,%s, chan %u, q %u,%u, wr %u.\n",
		cdev, lldi->adapter_type, lldi->nports,
		lldi->ports[0]->name, lldi->nchan, lldi->ntxq,
		lldi->nrxq, lldi->wr_cred);
	for (i = 0; i < lldi->nrxq; i++)
		log_debug(1 << CXGBI_DBG_DEV,
			"t4 0x%p, rxq id #%d: %u.\n",
			cdev, i, lldi->rxq_ids[i]);

	memcpy(cxgbi_cdev_priv(cdev), lldi, sizeof(*lldi));
	cdev->flags = CXGBI_FLAG_DEV_T4;
	cdev->pdev = lldi->pdev;
	cdev->ports = lldi->ports;
	cdev->nports = lldi->nports;
	cdev->mtus = lldi->mtus;
	cdev->nmtus = NMTUS;
	cdev->snd_win = cxgb4i_snd_win;
	cdev->rcv_win = cxgb4i_rcv_win;
	cdev->rx_credit_thres = cxgb4i_rx_credit_thres;
	cdev->skb_tx_rsvd = CXGB4I_TX_HEADER_LEN;
	cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr);
	cdev->itp = &cxgb4i_iscsi_transport;

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	cdev->pfvf = FW_VIID_PFN_GET(cxgb4_port_viid(lldi->ports[0])) << 8;
	pr_info("cdev 0x%p,%s, pfvf %u.\n",
		cdev, lldi->ports[0]->name, cdev->pfvf);

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	rc = cxgb4i_ddp_init(cdev);
	if (rc) {
		pr_info("t4 0x%p ddp init failed.\n", cdev);
		goto err_out;
	}
	rc = cxgb4i_ofld_init(cdev);
	if (rc) {
		pr_info("t4 0x%p ofld init failed.\n", cdev);
		goto err_out;
	}

	rc = cxgbi_hbas_add(cdev, CXGB4I_MAX_LUN, CXGBI_MAX_CONN,
				&cxgb4i_host_template, cxgb4i_stt);
	if (rc)
		goto err_out;

	for (i = 0; i < cdev->nports; i++) {
		pi = netdev_priv(lldi->ports[i]);
		cdev->hbas[i]->port_id = pi->port_id;
	}
	return cdev;

err_out:
	cxgbi_device_unregister(cdev);
	return ERR_PTR(-ENOMEM);
}

#define RX_PULL_LEN	128
static int t4_uld_rx_handler(void *handle, const __be64 *rsp,
				const struct pkt_gl *pgl)
{
	const struct cpl_act_establish *rpl;
	struct sk_buff *skb;
	unsigned int opc;
	struct cxgbi_device *cdev = handle;

	if (pgl == NULL) {
		unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;

1512
		skb = alloc_wr(len, 0, GFP_ATOMIC);
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		if (!skb)
			goto nomem;
		skb_copy_to_linear_data(skb, &rsp[1], len);
	} else {
		if (unlikely(*(u8 *)rsp != *(u8 *)pgl->va)) {
			pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
				pgl->va, be64_to_cpu(*rsp),
				be64_to_cpu(*(u64 *)pgl->va),
				pgl->tot_len);
			return 0;
		}
		skb = cxgb4_pktgl_to_skb(pgl, RX_PULL_LEN, RX_PULL_LEN);
		if (unlikely(!skb))
			goto nomem;
	}

	rpl = (struct cpl_act_establish *)skb->data;
	opc = rpl->ot.opcode;
	log_debug(1 << CXGBI_DBG_TOE,
		"cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
		 cdev, opc, rpl->ot.opcode_tid, ntohl(rpl->ot.opcode_tid), skb);
	if (cxgb4i_cplhandlers[opc])
		cxgb4i_cplhandlers[opc](cdev, skb);
	else {
		pr_err("No handler for opcode 0x%x.\n", opc);
		__kfree_skb(skb);
	}
	return 0;
nomem:
	log_debug(1 << CXGBI_DBG_TOE, "OOM bailing out.\n");
	return 1;
}

static int t4_uld_state_change(void *handle, enum cxgb4_state state)
{
	struct cxgbi_device *cdev = handle;

	switch (state) {
	case CXGB4_STATE_UP:
		pr_info("cdev 0x%p, UP.\n", cdev);
		/* re-initialize */
		break;
	case CXGB4_STATE_START_RECOVERY:
		pr_info("cdev 0x%p, RECOVERY.\n", cdev);
		/* close all connections */
		break;
	case CXGB4_STATE_DOWN:
		pr_info("cdev 0x%p, DOWN.\n", cdev);
		break;
	case CXGB4_STATE_DETACH:
		pr_info("cdev 0x%p, DETACH.\n", cdev);
		break;
	default:
		pr_info("cdev 0x%p, unknown state %d.\n", cdev, state);
		break;
	}
	return 0;
}

static int __init cxgb4i_init_module(void)
{
	int rc;

	printk(KERN_INFO "%s", version);

	rc = cxgbi_iscsi_init(&cxgb4i_iscsi_transport, &cxgb4i_stt);
	if (rc < 0)
		return rc;
	cxgb4_register_uld(CXGB4_ULD_ISCSI, &cxgb4i_uld_info);
	return 0;
}

static void __exit cxgb4i_exit_module(void)
{
	cxgb4_unregister_uld(CXGB4_ULD_ISCSI);
	cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T4);
	cxgbi_iscsi_cleanup(&cxgb4i_iscsi_transport, &cxgb4i_stt);
}

module_init(cxgb4i_init_module);
module_exit(cxgb4i_exit_module);