[linux-2.6-block.git] / drivers / target / iscsi / cxgbit / cxgbit_main.c

/*
 * Copyright (c) 2016 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 version 2 as
 * published by the Free Software Foundation.
 */

#define DRV_NAME "cxgbit"
#define DRV_VERSION "1.0.0-ko"
#define pr_fmt(fmt) DRV_NAME ": " fmt

#include "cxgbit.h"

#ifdef CONFIG_CHELSIO_T4_DCB
#include <net/dcbevent.h>
#include "cxgb4_dcb.h"
#endif

LIST_HEAD(cdev_list_head);
/* cdev list lock */
DEFINE_MUTEX(cdev_list_lock);

void _cxgbit_free_cdev(struct kref *kref)
{
	struct cxgbit_device *cdev;

	cdev = container_of(kref, struct cxgbit_device, kref);
	kfree(cdev);
}

static void cxgbit_set_mdsl(struct cxgbit_device *cdev)
{
	struct cxgb4_lld_info *lldi = &cdev->lldi;
	u32 mdsl;

#define ULP2_MAX_PKT_LEN 16224
#define ISCSI_PDU_NONPAYLOAD_LEN 312
	mdsl = min_t(u32, lldi->iscsi_iolen - ISCSI_PDU_NONPAYLOAD_LEN,
		     ULP2_MAX_PKT_LEN - ISCSI_PDU_NONPAYLOAD_LEN);
	mdsl = min_t(u32, mdsl, 8192);
	mdsl = min_t(u32, mdsl, (MAX_SKB_FRAGS - 1) * PAGE_SIZE);

	cdev->mdsl = mdsl;
}

static void *cxgbit_uld_add(const struct cxgb4_lld_info *lldi)
{
	struct cxgbit_device *cdev;

	if (is_t4(lldi->adapter_type))
		return ERR_PTR(-ENODEV);

	cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
	if (!cdev)
		return ERR_PTR(-ENOMEM);

	kref_init(&cdev->kref);

	cdev->lldi = *lldi;

	cxgbit_set_mdsl(cdev);

	if (cxgbit_ddp_init(cdev) < 0) {
		kfree(cdev);
		return ERR_PTR(-EINVAL);
	}

	if (!test_bit(CDEV_DDP_ENABLE, &cdev->flags))
		pr_info("cdev %s ddp init failed\n",
			pci_name(lldi->pdev));

	if (lldi->fw_vers >= 0x10d2b00)
		set_bit(CDEV_ISO_ENABLE, &cdev->flags);

	spin_lock_init(&cdev->cskq.lock);
	INIT_LIST_HEAD(&cdev->cskq.list);

	mutex_lock(&cdev_list_lock);
	list_add_tail(&cdev->list, &cdev_list_head);
	mutex_unlock(&cdev_list_lock);

	pr_info("cdev %s added for iSCSI target transport\n",
		pci_name(lldi->pdev));

	return cdev;
}

static void cxgbit_close_conn(struct cxgbit_device *cdev)
{
	struct cxgbit_sock *csk;
	struct sk_buff *skb;
	bool wakeup_thread = false;

	spin_lock_bh(&cdev->cskq.lock);
	list_for_each_entry(csk, &cdev->cskq.list, list) {
		skb = alloc_skb(0, GFP_ATOMIC);
		if (!skb)
			continue;

		spin_lock_bh(&csk->rxq.lock);
		__skb_queue_tail(&csk->rxq, skb);
		if (skb_queue_len(&csk->rxq) == 1)
			wakeup_thread = true;
		spin_unlock_bh(&csk->rxq.lock);

		if (wakeup_thread) {
			wake_up(&csk->waitq);
			wakeup_thread = false;
		}
	}
	spin_unlock_bh(&cdev->cskq.lock);
}

static void cxgbit_detach_cdev(struct cxgbit_device *cdev)
{
	bool free_cdev = false;

	spin_lock_bh(&cdev->cskq.lock);
	if (list_empty(&cdev->cskq.list))
		free_cdev = true;
	spin_unlock_bh(&cdev->cskq.lock);

	if (free_cdev) {
		mutex_lock(&cdev_list_lock);
		list_del(&cdev->list);
		mutex_unlock(&cdev_list_lock);

		cxgbit_put_cdev(cdev);
	} else {
		cxgbit_close_conn(cdev);
	}
}

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

	switch (state) {
	case CXGB4_STATE_UP:
		set_bit(CDEV_STATE_UP, &cdev->flags);
		pr_info("cdev %s state UP.\n", pci_name(cdev->lldi.pdev));
		break;
	case CXGB4_STATE_START_RECOVERY:
		clear_bit(CDEV_STATE_UP, &cdev->flags);
		cxgbit_close_conn(cdev);
		pr_info("cdev %s state RECOVERY.\n", pci_name(cdev->lldi.pdev));
		break;
	case CXGB4_STATE_DOWN:
		pr_info("cdev %s state DOWN.\n", pci_name(cdev->lldi.pdev));
		break;
	case CXGB4_STATE_DETACH:
		clear_bit(CDEV_STATE_UP, &cdev->flags);
		pr_info("cdev %s state DETACH.\n", pci_name(cdev->lldi.pdev));
		cxgbit_detach_cdev(cdev);
		break;
	default:
		pr_info("cdev %s unknown state %d.\n",
			pci_name(cdev->lldi.pdev), state);
		break;
	}
	return 0;
}

static void
cxgbit_proc_ddp_status(unsigned int tid, struct cpl_rx_data_ddp *cpl,
		       struct cxgbit_lro_pdu_cb *pdu_cb)
{
	unsigned int status = ntohl(cpl->ddpvld);

	pdu_cb->flags |= PDUCBF_RX_STATUS;
	pdu_cb->ddigest = ntohl(cpl->ulp_crc);
	pdu_cb->pdulen = ntohs(cpl->len);

	if (status & (1 << CPL_RX_ISCSI_DDP_STATUS_HCRC_SHIFT)) {
		pr_info("tid 0x%x, status 0x%x, hcrc bad.\n", tid, status);
		pdu_cb->flags |= PDUCBF_RX_HCRC_ERR;
	}

	if (status & (1 << CPL_RX_ISCSI_DDP_STATUS_DCRC_SHIFT)) {
		pr_info("tid 0x%x, status 0x%x, dcrc bad.\n", tid, status);
		pdu_cb->flags |= PDUCBF_RX_DCRC_ERR;
	}

	if (status & (1 << CPL_RX_ISCSI_DDP_STATUS_PAD_SHIFT))
		pr_info("tid 0x%x, status 0x%x, pad bad.\n", tid, status);

	if ((status & (1 << CPL_RX_ISCSI_DDP_STATUS_DDP_SHIFT)) &&
	    (!(pdu_cb->flags & PDUCBF_RX_DATA))) {
		pdu_cb->flags |= PDUCBF_RX_DATA_DDPD;
	}
}

static void
cxgbit_lro_add_packet_rsp(struct sk_buff *skb, u8 op, const __be64 *rsp)
{
	struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
	struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb,
						lro_cb->pdu_idx);
	struct cpl_rx_iscsi_ddp *cpl = (struct cpl_rx_iscsi_ddp *)(rsp + 1);

	cxgbit_proc_ddp_status(lro_cb->csk->tid, cpl, pdu_cb);

	if (pdu_cb->flags & PDUCBF_RX_HDR)
		pdu_cb->complete = true;

	lro_cb->complete = true;
	lro_cb->pdu_totallen += pdu_cb->pdulen;
	lro_cb->pdu_idx++;
}

static void
cxgbit_copy_frags(struct sk_buff *skb, const struct pkt_gl *gl,
		  unsigned int offset)
{
	u8 skb_frag_idx = skb_shinfo(skb)->nr_frags;
	u8 i;

	/* usually there's just one frag */
	__skb_fill_page_desc(skb, skb_frag_idx, gl->frags[0].page,
			     gl->frags[0].offset + offset,
			     gl->frags[0].size - offset);
	for (i = 1; i < gl->nfrags; i++)
		__skb_fill_page_desc(skb, skb_frag_idx + i,
				     gl->frags[i].page,
				     gl->frags[i].offset,
				     gl->frags[i].size);

	skb_shinfo(skb)->nr_frags += gl->nfrags;

	/* get a reference to the last page, we don't own it */
	get_page(gl->frags[gl->nfrags - 1].page);
}

static void
cxgbit_lro_add_packet_gl(struct sk_buff *skb, u8 op, const struct pkt_gl *gl)
{
	struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
	struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb,
						lro_cb->pdu_idx);
	u32 len, offset;

	if (op == CPL_ISCSI_HDR) {
		struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)gl->va;

		offset = sizeof(struct cpl_iscsi_hdr);
		pdu_cb->flags |= PDUCBF_RX_HDR;
		pdu_cb->seq = ntohl(cpl->seq);
		len = ntohs(cpl->len);
		pdu_cb->hdr = gl->va + offset;
		pdu_cb->hlen = len;
		pdu_cb->hfrag_idx = skb_shinfo(skb)->nr_frags;

		if (unlikely(gl->nfrags > 1))
			cxgbit_skcb_flags(skb) = 0;

		lro_cb->complete = false;
	} else {
		struct cpl_iscsi_data *cpl = (struct cpl_iscsi_data *)gl->va;

		offset = sizeof(struct cpl_iscsi_data);
		pdu_cb->flags |= PDUCBF_RX_DATA;
		len = ntohs(cpl->len);
		pdu_cb->dlen = len;
		pdu_cb->doffset = lro_cb->offset;
		pdu_cb->nr_dfrags = gl->nfrags;
		pdu_cb->dfrag_idx = skb_shinfo(skb)->nr_frags;
	}

	cxgbit_copy_frags(skb, gl, offset);

	pdu_cb->frags += gl->nfrags;
	lro_cb->offset += len;
	skb->len += len;
	skb->data_len += len;
	skb->truesize += len;
}

static struct sk_buff *
cxgbit_lro_init_skb(struct cxgbit_sock *csk, u8 op, const struct pkt_gl *gl,
		    const __be64 *rsp, struct napi_struct *napi)
{
	struct sk_buff *skb;
	struct cxgbit_lro_cb *lro_cb;

	skb = napi_alloc_skb(napi, LRO_SKB_MAX_HEADROOM);

	if (unlikely(!skb))
		return NULL;

	memset(skb->data, 0, LRO_SKB_MAX_HEADROOM);

	cxgbit_skcb_flags(skb) |= SKCBF_RX_LRO;

	lro_cb = cxgbit_skb_lro_cb(skb);

	cxgbit_get_csk(csk);

	lro_cb->csk = csk;

	return skb;
}

static void cxgbit_queue_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
{
	bool wakeup_thread = false;

	spin_lock(&csk->rxq.lock);
	__skb_queue_tail(&csk->rxq, skb);
	if (skb_queue_len(&csk->rxq) == 1)
		wakeup_thread = true;
	spin_unlock(&csk->rxq.lock);

	if (wakeup_thread)
		wake_up(&csk->waitq);
}

static void cxgbit_lro_flush(struct t4_lro_mgr *lro_mgr, struct sk_buff *skb)
{
	struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
	struct cxgbit_sock *csk = lro_cb->csk;

	csk->lro_skb = NULL;

	__skb_unlink(skb, &lro_mgr->lroq);
	cxgbit_queue_lro_skb(csk, skb);

	cxgbit_put_csk(csk);

	lro_mgr->lro_pkts++;
	lro_mgr->lro_session_cnt--;
}

static void cxgbit_uld_lro_flush(struct t4_lro_mgr *lro_mgr)
{
	struct sk_buff *skb;

	while ((skb = skb_peek(&lro_mgr->lroq)))
		cxgbit_lro_flush(lro_mgr, skb);
}

static int
cxgbit_lro_receive(struct cxgbit_sock *csk, u8 op, const __be64 *rsp,
		   const struct pkt_gl *gl, struct t4_lro_mgr *lro_mgr,
		   struct napi_struct *napi)
{
	struct sk_buff *skb;
	struct cxgbit_lro_cb *lro_cb;

	if (!csk) {
		pr_err("%s: csk NULL, op 0x%x.\n", __func__, op);
		goto out;
	}

	if (csk->lro_skb)
		goto add_packet;

start_lro:
	if (lro_mgr->lro_session_cnt >= MAX_LRO_SESSIONS) {
		cxgbit_uld_lro_flush(lro_mgr);
		goto start_lro;
	}

	skb = cxgbit_lro_init_skb(csk, op, gl, rsp, napi);
	if (unlikely(!skb))
		goto out;

	csk->lro_skb = skb;

	__skb_queue_tail(&lro_mgr->lroq, skb);
	lro_mgr->lro_session_cnt++;

add_packet:
	skb = csk->lro_skb;
	lro_cb = cxgbit_skb_lro_cb(skb);

	if ((gl && (((skb_shinfo(skb)->nr_frags + gl->nfrags) >
	    MAX_SKB_FRAGS) || (lro_cb->pdu_totallen >= LRO_FLUSH_LEN_MAX))) ||
	    (lro_cb->pdu_idx >= MAX_SKB_FRAGS)) {
		cxgbit_lro_flush(lro_mgr, skb);
		goto start_lro;
	}

	if (gl)
		cxgbit_lro_add_packet_gl(skb, op, gl);
	else
		cxgbit_lro_add_packet_rsp(skb, op, rsp);

	lro_mgr->lro_merged++;

	return 0;

out:
	return -1;
}

static int
cxgbit_uld_lro_rx_handler(void *hndl, const __be64 *rsp,
			  const struct pkt_gl *gl, struct t4_lro_mgr *lro_mgr,
			  struct napi_struct *napi)
{
	struct cxgbit_device *cdev = hndl;
	struct cxgb4_lld_info *lldi = &cdev->lldi;
	struct cpl_tx_data *rpl = NULL;
	struct cxgbit_sock *csk = NULL;
	unsigned int tid = 0;
	struct sk_buff *skb;
	unsigned int op = *(u8 *)rsp;
	bool lro_flush = true;

	switch (op) {
	case CPL_ISCSI_HDR:
	case CPL_ISCSI_DATA:
	case CPL_RX_ISCSI_DDP:
	case CPL_FW4_ACK:
		lro_flush = false;
	case CPL_ABORT_RPL_RSS:
	case CPL_PASS_ESTABLISH:
	case CPL_PEER_CLOSE:
	case CPL_CLOSE_CON_RPL:
	case CPL_ABORT_REQ_RSS:
	case CPL_SET_TCB_RPL:
	case CPL_RX_DATA:
		rpl = gl ? (struct cpl_tx_data *)gl->va :
			   (struct cpl_tx_data *)(rsp + 1);
		tid = GET_TID(rpl);
		csk = lookup_tid(lldi->tids, tid);
		break;
	default:
		break;
	}

	if (csk && csk->lro_skb && lro_flush)
		cxgbit_lro_flush(lro_mgr, csk->lro_skb);

	if (!gl) {
		unsigned int len;

		if (op == CPL_RX_ISCSI_DDP) {
			if (!cxgbit_lro_receive(csk, op, rsp, NULL, lro_mgr,
						napi))
				return 0;
		}

		len = 64 - sizeof(struct rsp_ctrl) - 8;
		skb = napi_alloc_skb(napi, len);
		if (!skb)
			goto nomem;
		__skb_put(skb, len);
		skb_copy_to_linear_data(skb, &rsp[1], len);
	} else {
		if (unlikely(op != *(u8 *)gl->va)) {
			pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
				gl->va, be64_to_cpu(*rsp),
				be64_to_cpu(*(u64 *)gl->va),
				gl->tot_len);
			return 0;
		}

		if (op == CPL_ISCSI_HDR || op == CPL_ISCSI_DATA) {
			if (!cxgbit_lro_receive(csk, op, rsp, gl, lro_mgr,
						napi))
				return 0;
		}

#define RX_PULL_LEN 128
		skb = cxgb4_pktgl_to_skb(gl, RX_PULL_LEN, RX_PULL_LEN);
		if (unlikely(!skb))
			goto nomem;
	}

	rpl = (struct cpl_tx_data *)skb->data;
	op = rpl->ot.opcode;
	cxgbit_skcb_rx_opcode(skb) = op;

	pr_debug("cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
		 cdev, op, rpl->ot.opcode_tid,
		 ntohl(rpl->ot.opcode_tid), skb);

	if (op < NUM_CPL_CMDS && cxgbit_cplhandlers[op]) {
		cxgbit_cplhandlers[op](cdev, skb);
	} else {
		pr_err("No handler for opcode 0x%x.\n", op);
		__kfree_skb(skb);
	}
	return 0;
nomem:
	pr_err("%s OOM bailing out.\n", __func__);
	return 1;
}

#ifdef CONFIG_CHELSIO_T4_DCB
struct cxgbit_dcb_work {
	struct dcb_app_type dcb_app;
	struct work_struct work;
};

static void
cxgbit_update_dcb_priority(struct cxgbit_device *cdev, u8 port_id,
			   u8 dcb_priority, u16 port_num)
{
	struct cxgbit_sock *csk;
	struct sk_buff *skb;
	u16 local_port;
	bool wakeup_thread = false;

	spin_lock_bh(&cdev->cskq.lock);
	list_for_each_entry(csk, &cdev->cskq.list, list) {
		if (csk->port_id != port_id)
			continue;

		if (csk->com.local_addr.ss_family == AF_INET6) {
			struct sockaddr_in6 *sock_in6;

			sock_in6 = (struct sockaddr_in6 *)&csk->com.local_addr;
			local_port = ntohs(sock_in6->sin6_port);
		} else {
			struct sockaddr_in *sock_in;

			sock_in = (struct sockaddr_in *)&csk->com.local_addr;
			local_port = ntohs(sock_in->sin_port);
		}

		if (local_port != port_num)
			continue;

		if (csk->dcb_priority == dcb_priority)
			continue;

		skb = alloc_skb(0, GFP_ATOMIC);
		if (!skb)
			continue;

		spin_lock(&csk->rxq.lock);
		__skb_queue_tail(&csk->rxq, skb);
		if (skb_queue_len(&csk->rxq) == 1)
			wakeup_thread = true;
		spin_unlock(&csk->rxq.lock);

		if (wakeup_thread) {
			wake_up(&csk->waitq);
			wakeup_thread = false;
		}
	}
	spin_unlock_bh(&cdev->cskq.lock);
}

static void cxgbit_dcb_workfn(struct work_struct *work)
{
	struct cxgbit_dcb_work *dcb_work;
	struct net_device *ndev;
	struct cxgbit_device *cdev = NULL;
	struct dcb_app_type *iscsi_app;
	u8 priority, port_id = 0xff;

	dcb_work = container_of(work, struct cxgbit_dcb_work, work);
	iscsi_app = &dcb_work->dcb_app;

	if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_IEEE) {
		if (iscsi_app->app.selector != IEEE_8021QAZ_APP_SEL_ANY)
			goto out;

		priority = iscsi_app->app.priority;

	} else if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_CEE) {
		if (iscsi_app->app.selector != DCB_APP_IDTYPE_PORTNUM)
			goto out;

		if (!iscsi_app->app.priority)
			goto out;

		priority = ffs(iscsi_app->app.priority) - 1;
	} else {
		goto out;
	}

	pr_debug("priority for ifid %d is %u\n",
		 iscsi_app->ifindex, priority);

	ndev = dev_get_by_index(&init_net, iscsi_app->ifindex);

	if (!ndev)
		goto out;

	mutex_lock(&cdev_list_lock);
	cdev = cxgbit_find_device(ndev, &port_id);

	dev_put(ndev);

	if (!cdev) {
		mutex_unlock(&cdev_list_lock);
		goto out;
	}

	cxgbit_update_dcb_priority(cdev, port_id, priority,
				   iscsi_app->app.protocol);
	mutex_unlock(&cdev_list_lock);
out:
	kfree(dcb_work);
}

static int
cxgbit_dcbevent_notify(struct notifier_block *nb, unsigned long action,
		       void *data)
{
	struct cxgbit_dcb_work *dcb_work;
	struct dcb_app_type *dcb_app = data;

	dcb_work = kzalloc(sizeof(*dcb_work), GFP_ATOMIC);
	if (!dcb_work)
		return NOTIFY_DONE;

	dcb_work->dcb_app = *dcb_app;
	INIT_WORK(&dcb_work->work, cxgbit_dcb_workfn);
	schedule_work(&dcb_work->work);
	return NOTIFY_OK;
}
#endif

static enum target_prot_op cxgbit_get_sup_prot_ops(struct iscsi_conn *conn)
{
	return TARGET_PROT_NORMAL;
}

static struct iscsit_transport cxgbit_transport = {
	.name			= DRV_NAME,
	.transport_type		= ISCSI_CXGBIT,
	.rdma_shutdown		= false,
	.priv_size		= sizeof(struct cxgbit_cmd),
	.owner			= THIS_MODULE,
	.iscsit_setup_np	= cxgbit_setup_np,
	.iscsit_accept_np	= cxgbit_accept_np,
	.iscsit_free_np		= cxgbit_free_np,
	.iscsit_free_conn	= cxgbit_free_conn,
	.iscsit_get_login_rx	= cxgbit_get_login_rx,
	.iscsit_put_login_tx	= cxgbit_put_login_tx,
	.iscsit_immediate_queue	= iscsit_immediate_queue,
	.iscsit_response_queue	= iscsit_response_queue,
	.iscsit_get_dataout	= iscsit_build_r2ts_for_cmd,
	.iscsit_queue_data_in	= iscsit_queue_rsp,
	.iscsit_queue_status	= iscsit_queue_rsp,
	.iscsit_xmit_pdu	= cxgbit_xmit_pdu,
	.iscsit_get_r2t_ttt	= cxgbit_get_r2t_ttt,
	.iscsit_get_rx_pdu	= cxgbit_get_rx_pdu,
	.iscsit_validate_params	= cxgbit_validate_params,
	.iscsit_release_cmd	= cxgbit_release_cmd,
	.iscsit_aborted_task	= iscsit_aborted_task,
	.iscsit_get_sup_prot_ops = cxgbit_get_sup_prot_ops,
};

static struct cxgb4_uld_info cxgbit_uld_info = {
	.name		= DRV_NAME,
	.add		= cxgbit_uld_add,
	.state_change	= cxgbit_uld_state_change,
	.lro_rx_handler = cxgbit_uld_lro_rx_handler,
	.lro_flush	= cxgbit_uld_lro_flush,
};

#ifdef CONFIG_CHELSIO_T4_DCB
static struct notifier_block cxgbit_dcbevent_nb = {
	.notifier_call = cxgbit_dcbevent_notify,
};
#endif

static int __init cxgbit_init(void)
{
	cxgb4_register_uld(CXGB4_ULD_ISCSIT, &cxgbit_uld_info);
	iscsit_register_transport(&cxgbit_transport);

#ifdef CONFIG_CHELSIO_T4_DCB
	pr_info("%s dcb enabled.\n", DRV_NAME);
	register_dcbevent_notifier(&cxgbit_dcbevent_nb);
#endif
	BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
		     sizeof(union cxgbit_skb_cb));
	return 0;
}

static void __exit cxgbit_exit(void)
{
	struct cxgbit_device *cdev, *tmp;

#ifdef CONFIG_CHELSIO_T4_DCB
	unregister_dcbevent_notifier(&cxgbit_dcbevent_nb);
#endif
	mutex_lock(&cdev_list_lock);
	list_for_each_entry_safe(cdev, tmp, &cdev_list_head, list) {
		list_del(&cdev->list);
		cxgbit_put_cdev(cdev);
	}
	mutex_unlock(&cdev_list_lock);
	iscsit_unregister_transport(&cxgbit_transport);
	cxgb4_unregister_uld(CXGB4_ULD_ISCSIT);
}

module_init(cxgbit_init);
module_exit(cxgbit_exit);

MODULE_DESCRIPTION("Chelsio iSCSI target offload driver");
MODULE_AUTHOR("Chelsio Communications");
MODULE_VERSION(DRV_VERSION);
MODULE_LICENSE("GPL");
Commit	Line	Data
9730ffcb VP	1	/*
	2	* Copyright (c) 2016 Chelsio Communications, Inc.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8
	9	#define DRV_NAME "cxgbit"
	10	#define DRV_VERSION "1.0.0-ko"
	11	#define pr_fmt(fmt) DRV_NAME ": " fmt
	12
	13	#include "cxgbit.h"
	14
	15	#ifdef CONFIG_CHELSIO_T4_DCB
	16	#include <net/dcbevent.h>
	17	#include "cxgb4_dcb.h"
	18	#endif
	19
	20	LIST_HEAD(cdev_list_head);
	21	/* cdev list lock */
	22	DEFINE_MUTEX(cdev_list_lock);
	23
	24	void _cxgbit_free_cdev(struct kref *kref)
	25	{
	26	struct cxgbit_device *cdev;
	27
	28	cdev = container_of(kref, struct cxgbit_device, kref);
	29	kfree(cdev);
	30	}
	31
	32	static void cxgbit_set_mdsl(struct cxgbit_device *cdev)
	33	{
	34	struct cxgb4_lld_info *lldi = &cdev->lldi;
	35	u32 mdsl;
	36
	37	#define ULP2_MAX_PKT_LEN 16224
	38	#define ISCSI_PDU_NONPAYLOAD_LEN 312
	39	mdsl = min_t(u32, lldi->iscsi_iolen - ISCSI_PDU_NONPAYLOAD_LEN,
	40	ULP2_MAX_PKT_LEN - ISCSI_PDU_NONPAYLOAD_LEN);
	41	mdsl = min_t(u32, mdsl, 8192);
	42	mdsl = min_t(u32, mdsl, (MAX_SKB_FRAGS - 1) * PAGE_SIZE);
	43
	44	cdev->mdsl = mdsl;
	45	}
	46
	47	static void cxgbit_uld_add(const struct cxgb4_lld_info lldi)
	48	{
	49	struct cxgbit_device *cdev;
	50
	51	if (is_t4(lldi->adapter_type))
	52	return ERR_PTR(-ENODEV);
	53
	54	cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
	55	if (!cdev)
	56	return ERR_PTR(-ENOMEM);
	57
	58	kref_init(&cdev->kref);
	59
	60	cdev->lldi = *lldi;
	61
	62	cxgbit_set_mdsl(cdev);
	63
	64	if (cxgbit_ddp_init(cdev) < 0) {
65	kfree(cdev);
66	return ERR_PTR(-EINVAL);
67	}
68
69	if (!test_bit(CDEV_DDP_ENABLE, &cdev->flags))
70	pr_info("cdev %s ddp init failed\n",
71	pci_name(lldi->pdev));
72
73	if (lldi->fw_vers >= 0x10d2b00)
74	set_bit(CDEV_ISO_ENABLE, &cdev->flags);
75
76	spin_lock_init(&cdev->cskq.lock);
77	INIT_LIST_HEAD(&cdev->cskq.list);
78
79	mutex_lock(&cdev_list_lock);
80	list_add_tail(&cdev->list, &cdev_list_head);
81	mutex_unlock(&cdev_list_lock);
82
83	pr_info("cdev %s added for iSCSI target transport\n",
84	pci_name(lldi->pdev));
85
86	return cdev;
87	}
88
89	static void cxgbit_close_conn(struct cxgbit_device *cdev)
90	{
91	struct cxgbit_sock *csk;
92	struct sk_buff *skb;
93	bool wakeup_thread = false;
94
95	spin_lock_bh(&cdev->cskq.lock);
96	list_for_each_entry(csk, &cdev->cskq.list, list) {
97	skb = alloc_skb(0, GFP_ATOMIC);
98	if (!skb)
99	continue;
100
101	spin_lock_bh(&csk->rxq.lock);
102	__skb_queue_tail(&csk->rxq, skb);
103	if (skb_queue_len(&csk->rxq) == 1)
104	wakeup_thread = true;
105	spin_unlock_bh(&csk->rxq.lock);
106
107	if (wakeup_thread) {
108	wake_up(&csk->waitq);
109	wakeup_thread = false;
110	}
111	}
112	spin_unlock_bh(&cdev->cskq.lock);
113	}
114
115	static void cxgbit_detach_cdev(struct cxgbit_device *cdev)
116	{
117	bool free_cdev = false;
118
119	spin_lock_bh(&cdev->cskq.lock);
120	if (list_empty(&cdev->cskq.list))
121	free_cdev = true;
122	spin_unlock_bh(&cdev->cskq.lock);
123
124	if (free_cdev) {
125	mutex_lock(&cdev_list_lock);
126	list_del(&cdev->list);
127	mutex_unlock(&cdev_list_lock);
128
129	cxgbit_put_cdev(cdev);
130	} else {
131	cxgbit_close_conn(cdev);
132	}
133	}
134
135	static int cxgbit_uld_state_change(void *handle, enum cxgb4_state state)
136	{
137	struct cxgbit_device *cdev = handle;
138
139	switch (state) {
140	case CXGB4_STATE_UP:
141	set_bit(CDEV_STATE_UP, &cdev->flags);
142	pr_info("cdev %s state UP.\n", pci_name(cdev->lldi.pdev));
143	break;
144	case CXGB4_STATE_START_RECOVERY:
145	clear_bit(CDEV_STATE_UP, &cdev->flags);
146	cxgbit_close_conn(cdev);
147	pr_info("cdev %s state RECOVERY.\n", pci_name(cdev->lldi.pdev));
148	break;
149	case CXGB4_STATE_DOWN:
150	pr_info("cdev %s state DOWN.\n", pci_name(cdev->lldi.pdev));
151	break;
152	case CXGB4_STATE_DETACH:
153	clear_bit(CDEV_STATE_UP, &cdev->flags);
154	pr_info("cdev %s state DETACH.\n", pci_name(cdev->lldi.pdev));
155	cxgbit_detach_cdev(cdev);
156	break;
157	default:
158	pr_info("cdev %s unknown state %d.\n",
159	pci_name(cdev->lldi.pdev), state);
160	break;
161	}
162	return 0;
163	}
164
165	static void
166	cxgbit_proc_ddp_status(unsigned int tid, struct cpl_rx_data_ddp *cpl,
167	struct cxgbit_lro_pdu_cb *pdu_cb)
168	{
169	unsigned int status = ntohl(cpl->ddpvld);
170
171	pdu_cb->flags \|= PDUCBF_RX_STATUS;
172	pdu_cb->ddigest = ntohl(cpl->ulp_crc);
173	pdu_cb->pdulen = ntohs(cpl->len);
174
175	if (status & (1 << CPL_RX_ISCSI_DDP_STATUS_HCRC_SHIFT)) {
176	pr_info("tid 0x%x, status 0x%x, hcrc bad.\n", tid, status);
177	pdu_cb->flags \|= PDUCBF_RX_HCRC_ERR;
178	}
179
180	if (status & (1 << CPL_RX_ISCSI_DDP_STATUS_DCRC_SHIFT)) {
181	pr_info("tid 0x%x, status 0x%x, dcrc bad.\n", tid, status);
182	pdu_cb->flags \|= PDUCBF_RX_DCRC_ERR;
183	}
184
185	if (status & (1 << CPL_RX_ISCSI_DDP_STATUS_PAD_SHIFT))
186	pr_info("tid 0x%x, status 0x%x, pad bad.\n", tid, status);
187
188	if ((status & (1 << CPL_RX_ISCSI_DDP_STATUS_DDP_SHIFT)) &&
189	(!(pdu_cb->flags & PDUCBF_RX_DATA))) {
190	pdu_cb->flags \|= PDUCBF_RX_DATA_DDPD;
191	}
192	}
193
194	static void
195	cxgbit_lro_add_packet_rsp(struct sk_buff skb, u8 op, const __be64 rsp)
196	{
197	struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
198	struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb,
199	lro_cb->pdu_idx);
200	struct cpl_rx_iscsi_ddp cpl = (struct cpl_rx_iscsi_ddp )(rsp + 1);
201
202	cxgbit_proc_ddp_status(lro_cb->csk->tid, cpl, pdu_cb);
203
204	if (pdu_cb->flags & PDUCBF_RX_HDR)
205	pdu_cb->complete = true;
206
207	lro_cb->complete = true;
208	lro_cb->pdu_totallen += pdu_cb->pdulen;
209	lro_cb->pdu_idx++;
210	}
211
212	static void
213	cxgbit_copy_frags(struct sk_buff skb, const struct pkt_gl gl,
214	unsigned int offset)
215	{
216	u8 skb_frag_idx = skb_shinfo(skb)->nr_frags;
217	u8 i;
218
219	/* usually there's just one frag */
220	__skb_fill_page_desc(skb, skb_frag_idx, gl->frags[0].page,
221	gl->frags[0].offset + offset,
222	gl->frags[0].size - offset);
223	for (i = 1; i < gl->nfrags; i++)
224	__skb_fill_page_desc(skb, skb_frag_idx + i,
225	gl->frags[i].page,
226	gl->frags[i].offset,
227	gl->frags[i].size);
228
229	skb_shinfo(skb)->nr_frags += gl->nfrags;
230
231	/* get a reference to the last page, we don't own it */
232	get_page(gl->frags[gl->nfrags - 1].page);
233	}
234
235	static void
236	cxgbit_lro_add_packet_gl(struct sk_buff skb, u8 op, const struct pkt_gl gl)
237	{
238	struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
239	struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb,
240	lro_cb->pdu_idx);
241	u32 len, offset;
242
243	if (op == CPL_ISCSI_HDR) {
244	struct cpl_iscsi_hdr cpl = (struct cpl_iscsi_hdr )gl->va;
245
246	offset = sizeof(struct cpl_iscsi_hdr);
247	pdu_cb->flags \|= PDUCBF_RX_HDR;
248	pdu_cb->seq = ntohl(cpl->seq);
249	len = ntohs(cpl->len);
250	pdu_cb->hdr = gl->va + offset;
251	pdu_cb->hlen = len;
252	pdu_cb->hfrag_idx = skb_shinfo(skb)->nr_frags;
253
254	if (unlikely(gl->nfrags > 1))
255	cxgbit_skcb_flags(skb) = 0;
256
257	lro_cb->complete = false;
258	} else {
259	struct cpl_iscsi_data cpl = (struct cpl_iscsi_data )gl->va;
260
261	offset = sizeof(struct cpl_iscsi_data);
262	pdu_cb->flags \|= PDUCBF_RX_DATA;
263	len = ntohs(cpl->len);
264	pdu_cb->dlen = len;
265	pdu_cb->doffset = lro_cb->offset;
266	pdu_cb->nr_dfrags = gl->nfrags;
267	pdu_cb->dfrag_idx = skb_shinfo(skb)->nr_frags;
268	}
269
270	cxgbit_copy_frags(skb, gl, offset);
271
272	pdu_cb->frags += gl->nfrags;
273	lro_cb->offset += len;
274	skb->len += len;
275	skb->data_len += len;
276	skb->truesize += len;
277	}
278
279	static struct sk_buff *
280	cxgbit_lro_init_skb(struct cxgbit_sock csk, u8 op, const struct pkt_gl gl,
281	const __be64 rsp, struct napi_struct napi)
282	{
283	struct sk_buff *skb;
284	struct cxgbit_lro_cb *lro_cb;
285
286	skb = napi_alloc_skb(napi, LRO_SKB_MAX_HEADROOM);
287
288	if (unlikely(!skb))
289	return NULL;
290
291	memset(skb->data, 0, LRO_SKB_MAX_HEADROOM);
292
293	cxgbit_skcb_flags(skb) \|= SKCBF_RX_LRO;
294
295	lro_cb = cxgbit_skb_lro_cb(skb);
296
297	cxgbit_get_csk(csk);
298
299	lro_cb->csk = csk;
300
301	return skb;
302	}
303
304	static void cxgbit_queue_lro_skb(struct cxgbit_sock csk, struct sk_buff skb)
305	{
306	bool wakeup_thread = false;
307
308	spin_lock(&csk->rxq.lock);
309	__skb_queue_tail(&csk->rxq, skb);
310	if (skb_queue_len(&csk->rxq) == 1)
311	wakeup_thread = true;
312	spin_unlock(&csk->rxq.lock);
313
314	if (wakeup_thread)
315	wake_up(&csk->waitq);
316	}
317
318	static void cxgbit_lro_flush(struct t4_lro_mgr lro_mgr, struct sk_buff skb)
319	{
320	struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
321	struct cxgbit_sock *csk = lro_cb->csk;
322
323	csk->lro_skb = NULL;
324
325	__skb_unlink(skb, &lro_mgr->lroq);
326	cxgbit_queue_lro_skb(csk, skb);
327
328	cxgbit_put_csk(csk);
329
330	lro_mgr->lro_pkts++;
331	lro_mgr->lro_session_cnt--;
332	}
333
334	static void cxgbit_uld_lro_flush(struct t4_lro_mgr *lro_mgr)
335	{
336	struct sk_buff *skb;
337
338	while ((skb = skb_peek(&lro_mgr->lroq)))
339	cxgbit_lro_flush(lro_mgr, skb);
340	}
341
342	static int
343	cxgbit_lro_receive(struct cxgbit_sock csk, u8 op, const __be64 rsp,
344	const struct pkt_gl gl, struct t4_lro_mgr lro_mgr,
345	struct napi_struct *napi)
346	{
347	struct sk_buff *skb;
348	struct cxgbit_lro_cb *lro_cb;
349
350	if (!csk) {
351	pr_err("%s: csk NULL, op 0x%x.\n", __func__, op);
352	goto out;
353	}
354
355	if (csk->lro_skb)
356	goto add_packet;
357
358	start_lro:
359	if (lro_mgr->lro_session_cnt >= MAX_LRO_SESSIONS) {
360	cxgbit_uld_lro_flush(lro_mgr);
361	goto start_lro;
362	}
363
364	skb = cxgbit_lro_init_skb(csk, op, gl, rsp, napi);
365	if (unlikely(!skb))
366	goto out;
367
368	csk->lro_skb = skb;
369
370	__skb_queue_tail(&lro_mgr->lroq, skb);
371	lro_mgr->lro_session_cnt++;
372
373	add_packet:
374	skb = csk->lro_skb;
375	lro_cb = cxgbit_skb_lro_cb(skb);
376
377	if ((gl && (((skb_shinfo(skb)->nr_frags + gl->nfrags) >
378	MAX_SKB_FRAGS) \|\| (lro_cb->pdu_totallen >= LRO_FLUSH_LEN_MAX))) \|\|
379	(lro_cb->pdu_idx >= MAX_SKB_FRAGS)) {
380	cxgbit_lro_flush(lro_mgr, skb);
381	goto start_lro;
382	}
383
384	if (gl)
385	cxgbit_lro_add_packet_gl(skb, op, gl);
386	else
387	cxgbit_lro_add_packet_rsp(skb, op, rsp);
388
389	lro_mgr->lro_merged++;
390
391	return 0;
392
393	out:
394	return -1;
395	}
396
397	static int
398	cxgbit_uld_lro_rx_handler(void hndl, const __be64 rsp,
399	const struct pkt_gl gl, struct t4_lro_mgr lro_mgr,
400	struct napi_struct *napi)
401	{
402	struct cxgbit_device *cdev = hndl;
403	struct cxgb4_lld_info *lldi = &cdev->lldi;
404	struct cpl_tx_data *rpl = NULL;
405	struct cxgbit_sock *csk = NULL;
406	unsigned int tid = 0;
407	struct sk_buff *skb;
408	unsigned int op = (u8 )rsp;
409	bool lro_flush = true;
410
411	switch (op) {
412	case CPL_ISCSI_HDR:
413	case CPL_ISCSI_DATA:
414	case CPL_RX_ISCSI_DDP:
415	case CPL_FW4_ACK:
416	lro_flush = false;
417	case CPL_ABORT_RPL_RSS:
418	case CPL_PASS_ESTABLISH:
419	case CPL_PEER_CLOSE:
420	case CPL_CLOSE_CON_RPL:
421	case CPL_ABORT_REQ_RSS:
422	case CPL_SET_TCB_RPL:
423	case CPL_RX_DATA:
424	rpl = gl ? (struct cpl_tx_data *)gl->va :
425	(struct cpl_tx_data *)(rsp + 1);
426	tid = GET_TID(rpl);
427	csk = lookup_tid(lldi->tids, tid);
428	break;
429	default:
430	break;
431	}
432
433	if (csk && csk->lro_skb && lro_flush)
434	cxgbit_lro_flush(lro_mgr, csk->lro_skb);
435
436	if (!gl) {
437	unsigned int len;
438
439	if (op == CPL_RX_ISCSI_DDP) {
440	if (!cxgbit_lro_receive(csk, op, rsp, NULL, lro_mgr,
441	napi))
442	return 0;
443	}
444
445	len = 64 - sizeof(struct rsp_ctrl) - 8;
446	skb = napi_alloc_skb(napi, len);
447	if (!skb)
448	goto nomem;
449	__skb_put(skb, len);
450	skb_copy_to_linear_data(skb, &rsp[1], len);
451	} else {
452	if (unlikely(op != (u8 )gl->va)) {
453	pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
454	gl->va, be64_to_cpu(*rsp),
455	be64_to_cpu((u64 )gl->va),
456	gl->tot_len);
457	return 0;
458	}
459
460	if (op == CPL_ISCSI_HDR \|\| op == CPL_ISCSI_DATA) {
461	if (!cxgbit_lro_receive(csk, op, rsp, gl, lro_mgr,
462	napi))
463	return 0;
464	}
465
466	#define RX_PULL_LEN 128
467	skb = cxgb4_pktgl_to_skb(gl, RX_PULL_LEN, RX_PULL_LEN);
468	if (unlikely(!skb))
469	goto nomem;
470	}
471
472	rpl = (struct cpl_tx_data *)skb->data;
473	op = rpl->ot.opcode;
474	cxgbit_skcb_rx_opcode(skb) = op;
475
476	pr_debug("cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
477	cdev, op, rpl->ot.opcode_tid,
478	ntohl(rpl->ot.opcode_tid), skb);
479
480	if (op < NUM_CPL_CMDS && cxgbit_cplhandlers[op]) {
481	cxgbit_cplhandlers[op](cdev, skb);
482	} else {
483	pr_err("No handler for opcode 0x%x.\n", op);
484	__kfree_skb(skb);
485	}
486	return 0;
487	nomem:
488	pr_err("%s OOM bailing out.\n", __func__);
489	return 1;
490	}
491
492	#ifdef CONFIG_CHELSIO_T4_DCB
493	struct cxgbit_dcb_work {
494	struct dcb_app_type dcb_app;
495	struct work_struct work;
496	};
497
498	static void
499	cxgbit_update_dcb_priority(struct cxgbit_device *cdev, u8 port_id,
500	u8 dcb_priority, u16 port_num)
501	{
502	struct cxgbit_sock *csk;
503	struct sk_buff *skb;
504	u16 local_port;
505	bool wakeup_thread = false;
506
507	spin_lock_bh(&cdev->cskq.lock);
508	list_for_each_entry(csk, &cdev->cskq.list, list) {
509	if (csk->port_id != port_id)
510	continue;
511
512	if (csk->com.local_addr.ss_family == AF_INET6) {
513	struct sockaddr_in6 *sock_in6;
514
515	sock_in6 = (struct sockaddr_in6 *)&csk->com.local_addr;
516	local_port = ntohs(sock_in6->sin6_port);
517	} else {
518	struct sockaddr_in *sock_in;
519
520	sock_in = (struct sockaddr_in *)&csk->com.local_addr;
521	local_port = ntohs(sock_in->sin_port);
522	}
523
524	if (local_port != port_num)
525	continue;
526
527	if (csk->dcb_priority == dcb_priority)
528	continue;
529
530	skb = alloc_skb(0, GFP_ATOMIC);
531	if (!skb)
532	continue;
533
534	spin_lock(&csk->rxq.lock);
535	__skb_queue_tail(&csk->rxq, skb);
536	if (skb_queue_len(&csk->rxq) == 1)
537	wakeup_thread = true;
538	spin_unlock(&csk->rxq.lock);
539
540	if (wakeup_thread) {
541	wake_up(&csk->waitq);
542	wakeup_thread = false;
543	}
544	}
545	spin_unlock_bh(&cdev->cskq.lock);
546	}
547
548	static void cxgbit_dcb_workfn(struct work_struct *work)
549	{
550	struct cxgbit_dcb_work *dcb_work;
551	struct net_device *ndev;
552	struct cxgbit_device *cdev = NULL;
553	struct dcb_app_type *iscsi_app;
554	u8 priority, port_id = 0xff;
555
556	dcb_work = container_of(work, struct cxgbit_dcb_work, work);
557	iscsi_app = &dcb_work->dcb_app;
558
559	if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_IEEE) {
560	if (iscsi_app->app.selector != IEEE_8021QAZ_APP_SEL_ANY)
561	goto out;
562
563	priority = iscsi_app->app.priority;
564
565	} else if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_CEE) {
566	if (iscsi_app->app.selector != DCB_APP_IDTYPE_PORTNUM)
567	goto out;
568
569	if (!iscsi_app->app.priority)
570	goto out;
571
572	priority = ffs(iscsi_app->app.priority) - 1;
573	} else {
574	goto out;
575	}
576
577	pr_debug("priority for ifid %d is %u\n",
578	iscsi_app->ifindex, priority);
579
580	ndev = dev_get_by_index(&init_net, iscsi_app->ifindex);
581
582	if (!ndev)
583	goto out;
584
585	mutex_lock(&cdev_list_lock);
586	cdev = cxgbit_find_device(ndev, &port_id);
587
588	dev_put(ndev);
589
590	if (!cdev) {
591	mutex_unlock(&cdev_list_lock);
592	goto out;
593	}
594
595	cxgbit_update_dcb_priority(cdev, port_id, priority,
596	iscsi_app->app.protocol);
597	mutex_unlock(&cdev_list_lock);
598	out:
599	kfree(dcb_work);
600	}
601
602	static int
603	cxgbit_dcbevent_notify(struct notifier_block *nb, unsigned long action,
604	void *data)
605	{
606	struct cxgbit_dcb_work *dcb_work;
607	struct dcb_app_type *dcb_app = data;
608
609	dcb_work = kzalloc(sizeof(*dcb_work), GFP_ATOMIC);
610	if (!dcb_work)
611	return NOTIFY_DONE;
612
613	dcb_work->dcb_app = *dcb_app;
614	INIT_WORK(&dcb_work->work, cxgbit_dcb_workfn);
615	schedule_work(&dcb_work->work);
616	return NOTIFY_OK;
617	}
618	#endif
619
620	static enum target_prot_op cxgbit_get_sup_prot_ops(struct iscsi_conn *conn)
621	{
622	return TARGET_PROT_NORMAL;
623	}
624
625	static struct iscsit_transport cxgbit_transport = {
626	.name = DRV_NAME,
ff7199b0	627	.transport_type = ISCSI_CXGBIT,
bd027d85	628	.rdma_shutdown = false,
9730ffcb VP	629	.priv_size = sizeof(struct cxgbit_cmd),
	630	.owner = THIS_MODULE,
	631	.iscsit_setup_np = cxgbit_setup_np,
	632	.iscsit_accept_np = cxgbit_accept_np,
	633	.iscsit_free_np = cxgbit_free_np,
	634	.iscsit_free_conn = cxgbit_free_conn,
	635	.iscsit_get_login_rx = cxgbit_get_login_rx,
	636	.iscsit_put_login_tx = cxgbit_put_login_tx,
	637	.iscsit_immediate_queue = iscsit_immediate_queue,
	638	.iscsit_response_queue = iscsit_response_queue,
	639	.iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
	640	.iscsit_queue_data_in = iscsit_queue_rsp,
	641	.iscsit_queue_status = iscsit_queue_rsp,
	642	.iscsit_xmit_pdu = cxgbit_xmit_pdu,
	643	.iscsit_get_r2t_ttt = cxgbit_get_r2t_ttt,
	644	.iscsit_get_rx_pdu = cxgbit_get_rx_pdu,
	645	.iscsit_validate_params = cxgbit_validate_params,
	646	.iscsit_release_cmd = cxgbit_release_cmd,
	647	.iscsit_aborted_task = iscsit_aborted_task,
	648	.iscsit_get_sup_prot_ops = cxgbit_get_sup_prot_ops,
	649	};
	650
	651	static struct cxgb4_uld_info cxgbit_uld_info = {
	652	.name = DRV_NAME,
	653	.add = cxgbit_uld_add,
	654	.state_change = cxgbit_uld_state_change,
	655	.lro_rx_handler = cxgbit_uld_lro_rx_handler,
	656	.lro_flush = cxgbit_uld_lro_flush,
	657	};
	658
	659	#ifdef CONFIG_CHELSIO_T4_DCB
	660	static struct notifier_block cxgbit_dcbevent_nb = {
	661	.notifier_call = cxgbit_dcbevent_notify,
	662	};
	663	#endif
	664
	665	static int __init cxgbit_init(void)
	666	{
	667	cxgb4_register_uld(CXGB4_ULD_ISCSIT, &cxgbit_uld_info);
	668	iscsit_register_transport(&cxgbit_transport);
	669
	670	#ifdef CONFIG_CHELSIO_T4_DCB
	671	pr_info("%s dcb enabled.\n", DRV_NAME);
	672	register_dcbevent_notifier(&cxgbit_dcbevent_nb);
	673	#endif
	674	BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
	675	sizeof(union cxgbit_skb_cb));
	676	return 0;
	677	}
	678
	679	static void __exit cxgbit_exit(void)
	680	{
	681	struct cxgbit_device cdev, tmp;
	682
	683	#ifdef CONFIG_CHELSIO_T4_DCB
	684	unregister_dcbevent_notifier(&cxgbit_dcbevent_nb);
	685	#endif
	686	mutex_lock(&cdev_list_lock);
	687	list_for_each_entry_safe(cdev, tmp, &cdev_list_head, list) {
	688	list_del(&cdev->list);
	689	cxgbit_put_cdev(cdev);
	690	}
	691	mutex_unlock(&cdev_list_lock);
	692	iscsit_unregister_transport(&cxgbit_transport);
693	cxgb4_unregister_uld(CXGB4_ULD_ISCSIT);
694	}
695
696	module_init(cxgbit_init);
697	module_exit(cxgbit_exit);
698
699	MODULE_DESCRIPTION("Chelsio iSCSI target offload driver");
700	MODULE_AUTHOR("Chelsio Communications");
701	MODULE_VERSION(DRV_VERSION);
702	MODULE_LICENSE("GPL");