libcxgbi.c 67.2 KB
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/*
 * libcxgbi.c: Chelsio common library for T3/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)
 * Written by: Rakesh Ranjan (rranjan@chelsio.com)
 */

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

#include <linux/skbuff.h>
#include <linux/crypto.h>
#include <linux/scatterlist.h>
#include <linux/pci.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include <linux/if_vlan.h>
#include <linux/inet.h>
#include <net/dst.h>
#include <net/route.h>
#include <linux/inetdevice.h>	/* ip_dev_find */
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#include <linux/module.h>
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#include <net/tcp.h>

static unsigned int dbg_level;

#include "libcxgbi.h"

#define DRV_MODULE_NAME		"libcxgbi"
#define DRV_MODULE_DESC		"Chelsio iSCSI driver library"
#define DRV_MODULE_VERSION	"0.9.0"
#define DRV_MODULE_RELDATE	"Jun. 2010"

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, "libiscsi debug level (default=0)");


/*
 * cxgbi device management
 * maintains a list of the cxgbi devices
 */
static LIST_HEAD(cdev_list);
static DEFINE_MUTEX(cdev_mutex);

int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
				unsigned int max_conn)
{
	struct cxgbi_ports_map *pmap = &cdev->pmap;

	pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
					     sizeof(struct cxgbi_sock *),
					     GFP_KERNEL);
	if (!pmap->port_csk) {
		pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
		return -ENOMEM;
	}

	pmap->max_connect = max_conn;
	pmap->sport_base = base;
	spin_lock_init(&pmap->lock);
	return 0;
}
EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);

void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
{
	struct cxgbi_ports_map *pmap = &cdev->pmap;
	struct cxgbi_sock *csk;
	int i;

	for (i = 0; i < pmap->max_connect; i++) {
		if (pmap->port_csk[i]) {
			csk = pmap->port_csk[i];
			pmap->port_csk[i] = NULL;
			log_debug(1 << CXGBI_DBG_SOCK,
				"csk 0x%p, cdev 0x%p, offload down.\n",
				csk, cdev);
			spin_lock_bh(&csk->lock);
			cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
			cxgbi_sock_closed(csk);
			spin_unlock_bh(&csk->lock);
			cxgbi_sock_put(csk);
		}
	}
}
EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);

static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
{
	log_debug(1 << CXGBI_DBG_DEV,
		"cdev 0x%p, p# %u.\n", cdev, cdev->nports);
	cxgbi_hbas_remove(cdev);
	cxgbi_device_portmap_cleanup(cdev);
	if (cdev->dev_ddp_cleanup)
		cdev->dev_ddp_cleanup(cdev);
	else
		cxgbi_ddp_cleanup(cdev);
	if (cdev->ddp)
		cxgbi_ddp_cleanup(cdev);
	if (cdev->pmap.max_connect)
		cxgbi_free_big_mem(cdev->pmap.port_csk);
	kfree(cdev);
}

struct cxgbi_device *cxgbi_device_register(unsigned int extra,
					   unsigned int nports)
{
	struct cxgbi_device *cdev;

	cdev = kzalloc(sizeof(*cdev) + extra + nports *
			(sizeof(struct cxgbi_hba *) +
			 sizeof(struct net_device *)),
			GFP_KERNEL);
	if (!cdev) {
		pr_warn("nport %d, OOM.\n", nports);
		return NULL;
	}
	cdev->ports = (struct net_device **)(cdev + 1);
	cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
						sizeof(struct net_device *));
	if (extra)
		cdev->dd_data = ((char *)cdev->hbas) +
				nports * sizeof(struct cxgbi_hba *);
	spin_lock_init(&cdev->pmap.lock);

	mutex_lock(&cdev_mutex);
	list_add_tail(&cdev->list_head, &cdev_list);
	mutex_unlock(&cdev_mutex);

	log_debug(1 << CXGBI_DBG_DEV,
		"cdev 0x%p, p# %u.\n", cdev, nports);
	return cdev;
}
EXPORT_SYMBOL_GPL(cxgbi_device_register);

void cxgbi_device_unregister(struct cxgbi_device *cdev)
{
	log_debug(1 << CXGBI_DBG_DEV,
		"cdev 0x%p, p# %u,%s.\n",
		cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
	mutex_lock(&cdev_mutex);
	list_del(&cdev->list_head);
	mutex_unlock(&cdev_mutex);
	cxgbi_device_destroy(cdev);
}
EXPORT_SYMBOL_GPL(cxgbi_device_unregister);

void cxgbi_device_unregister_all(unsigned int flag)
{
	struct cxgbi_device *cdev, *tmp;

	mutex_lock(&cdev_mutex);
	list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
		if ((cdev->flags & flag) == flag) {
			log_debug(1 << CXGBI_DBG_DEV,
				"cdev 0x%p, p# %u,%s.\n",
				cdev, cdev->nports, cdev->nports ?
				 cdev->ports[0]->name : "");
			list_del(&cdev->list_head);
			cxgbi_device_destroy(cdev);
		}
	}
	mutex_unlock(&cdev_mutex);
}
EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);

struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
{
	struct cxgbi_device *cdev, *tmp;

	mutex_lock(&cdev_mutex);
	list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
		if (cdev->lldev == lldev) {
			mutex_unlock(&cdev_mutex);
			return cdev;
		}
	}
	mutex_unlock(&cdev_mutex);
	log_debug(1 << CXGBI_DBG_DEV,
		"lldev 0x%p, NO match found.\n", lldev);
	return NULL;
}
EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);

static struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
							int *port)
{
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	struct net_device *vdev = NULL;
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	struct cxgbi_device *cdev, *tmp;
	int i;

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	if (ndev->priv_flags & IFF_802_1Q_VLAN) {
		vdev = ndev;
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		ndev = vlan_dev_real_dev(ndev);
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		log_debug(1 << CXGBI_DBG_DEV,
			"vlan dev %s -> %s.\n", vdev->name, ndev->name);
	}
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	mutex_lock(&cdev_mutex);
	list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
		for (i = 0; i < cdev->nports; i++) {
			if (ndev == cdev->ports[i]) {
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				cdev->hbas[i]->vdev = vdev;
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				mutex_unlock(&cdev_mutex);
				if (port)
					*port = i;
				return cdev;
			}
		}
	}
	mutex_unlock(&cdev_mutex);
	log_debug(1 << CXGBI_DBG_DEV,
		"ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
	return NULL;
}

void cxgbi_hbas_remove(struct cxgbi_device *cdev)
{
	int i;
	struct cxgbi_hba *chba;

	log_debug(1 << CXGBI_DBG_DEV,
		"cdev 0x%p, p#%u.\n", cdev, cdev->nports);

	for (i = 0; i < cdev->nports; i++) {
		chba = cdev->hbas[i];
		if (chba) {
			cdev->hbas[i] = NULL;
			iscsi_host_remove(chba->shost);
			pci_dev_put(cdev->pdev);
			iscsi_host_free(chba->shost);
		}
	}
}
EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);

int cxgbi_hbas_add(struct cxgbi_device *cdev, unsigned int max_lun,
		unsigned int max_id, struct scsi_host_template *sht,
		struct scsi_transport_template *stt)
{
	struct cxgbi_hba *chba;
	struct Scsi_Host *shost;
	int i, err;

	log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);

	for (i = 0; i < cdev->nports; i++) {
		shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
		if (!shost) {
			pr_info("0x%p, p%d, %s, host alloc failed.\n",
				cdev, i, cdev->ports[i]->name);
			err = -ENOMEM;
			goto err_out;
		}

		shost->transportt = stt;
		shost->max_lun = max_lun;
		shost->max_id = max_id;
		shost->max_channel = 0;
		shost->max_cmd_len = 16;

		chba = iscsi_host_priv(shost);
		chba->cdev = cdev;
		chba->ndev = cdev->ports[i];
		chba->shost = shost;

		log_debug(1 << CXGBI_DBG_DEV,
			"cdev 0x%p, p#%d %s: chba 0x%p.\n",
			cdev, i, cdev->ports[i]->name, chba);

		pci_dev_get(cdev->pdev);
		err = iscsi_host_add(shost, &cdev->pdev->dev);
		if (err) {
			pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
				cdev, i, cdev->ports[i]->name);
			pci_dev_put(cdev->pdev);
			scsi_host_put(shost);
			goto  err_out;
		}

		cdev->hbas[i] = chba;
	}

	return 0;

err_out:
	cxgbi_hbas_remove(cdev);
	return err;
}
EXPORT_SYMBOL_GPL(cxgbi_hbas_add);

/*
 * iSCSI offload
 *
 * - source port management
 *   To find a free source port in the port allocation map we use a very simple
 *   rotor scheme to look for the next free port.
 *
 *   If a source port has been specified make sure that it doesn't collide with
 *   our normal source port allocation map.  If it's outside the range of our
 *   allocation/deallocation scheme just let them use it.
 *
 *   If the source port is outside our allocation range, the caller is
 *   responsible for keeping track of their port usage.
 */
static int sock_get_port(struct cxgbi_sock *csk)
{
	struct cxgbi_device *cdev = csk->cdev;
	struct cxgbi_ports_map *pmap = &cdev->pmap;
	unsigned int start;
	int idx;

	if (!pmap->max_connect) {
		pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
			   cdev, csk->port_id, cdev->ports[csk->port_id]->name);
		return -EADDRNOTAVAIL;
	}

	if (csk->saddr.sin_port) {
		pr_err("source port NON-ZERO %u.\n",
			ntohs(csk->saddr.sin_port));
		return -EADDRINUSE;
	}

	spin_lock_bh(&pmap->lock);
	if (pmap->used >= pmap->max_connect) {
		spin_unlock_bh(&pmap->lock);
		pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
			cdev, csk->port_id, cdev->ports[csk->port_id]->name);
		return -EADDRNOTAVAIL;
	}

	start = idx = pmap->next;
	do {
		if (++idx >= pmap->max_connect)
			idx = 0;
		if (!pmap->port_csk[idx]) {
			pmap->used++;
			csk->saddr.sin_port =
				htons(pmap->sport_base + idx);
			pmap->next = idx;
			pmap->port_csk[idx] = csk;
			spin_unlock_bh(&pmap->lock);
			cxgbi_sock_get(csk);
			log_debug(1 << CXGBI_DBG_SOCK,
				"cdev 0x%p, p#%u %s, p %u, %u.\n",
				cdev, csk->port_id,
				cdev->ports[csk->port_id]->name,
				pmap->sport_base + idx, pmap->next);
			return 0;
		}
	} while (idx != start);
	spin_unlock_bh(&pmap->lock);

	/* should not happen */
	pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
		cdev, csk->port_id, cdev->ports[csk->port_id]->name,
		pmap->next);
	return -EADDRNOTAVAIL;
}

static void sock_put_port(struct cxgbi_sock *csk)
{
	struct cxgbi_device *cdev = csk->cdev;
	struct cxgbi_ports_map *pmap = &cdev->pmap;

	if (csk->saddr.sin_port) {
		int idx = ntohs(csk->saddr.sin_port) - pmap->sport_base;

		csk->saddr.sin_port = 0;
		if (idx < 0 || idx >= pmap->max_connect) {
			pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
				cdev, csk->port_id,
				cdev->ports[csk->port_id]->name,
				ntohs(csk->saddr.sin_port));
			return;
		}

		spin_lock_bh(&pmap->lock);
		pmap->port_csk[idx] = NULL;
		pmap->used--;
		spin_unlock_bh(&pmap->lock);

		log_debug(1 << CXGBI_DBG_SOCK,
			"cdev 0x%p, p#%u %s, release %u.\n",
			cdev, csk->port_id, cdev->ports[csk->port_id]->name,
			pmap->sport_base + idx);

		cxgbi_sock_put(csk);
	}
}

/*
 * iscsi tcp connection
 */
void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
{
	if (csk->cpl_close) {
		kfree_skb(csk->cpl_close);
		csk->cpl_close = NULL;
	}
	if (csk->cpl_abort_req) {
		kfree_skb(csk->cpl_abort_req);
		csk->cpl_abort_req = NULL;
	}
	if (csk->cpl_abort_rpl) {
		kfree_skb(csk->cpl_abort_rpl);
		csk->cpl_abort_rpl = NULL;
	}
}
EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);

static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
{
	struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);

	if (!csk) {
		pr_info("alloc csk %zu failed.\n", sizeof(*csk));
		return NULL;
	}

	if (cdev->csk_alloc_cpls(csk) < 0) {
		pr_info("csk 0x%p, alloc cpls failed.\n", csk);
		kfree(csk);
		return NULL;
	}

	spin_lock_init(&csk->lock);
	kref_init(&csk->refcnt);
	skb_queue_head_init(&csk->receive_queue);
	skb_queue_head_init(&csk->write_queue);
	setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
	rwlock_init(&csk->callback_lock);
	csk->cdev = cdev;
	csk->flags = 0;
	cxgbi_sock_set_state(csk, CTP_CLOSED);

	log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);

	return csk;
}

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static struct rtable *find_route_ipv4(struct flowi4 *fl4,
				      __be32 saddr, __be32 daddr,
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				      __be16 sport, __be16 dport, u8 tos)
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{
	struct rtable *rt;

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	rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
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				   dport, sport, IPPROTO_TCP, tos, 0);
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	if (IS_ERR(rt))
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		return NULL;

	return rt;
}

static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
{
	struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
	struct dst_entry *dst;
	struct net_device *ndev;
	struct cxgbi_device *cdev;
	struct rtable *rt = NULL;
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	struct neighbour *n;
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	struct flowi4 fl4;
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	struct cxgbi_sock *csk = NULL;
	unsigned int mtu = 0;
	int port = 0xFFFF;
	int err = 0;

	if (daddr->sin_family != AF_INET) {
		pr_info("address family 0x%x NOT supported.\n",
			daddr->sin_family);
		err = -EAFNOSUPPORT;
		goto err_out;
	}

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	rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
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	if (!rt) {
		pr_info("no route to ipv4 0x%x, port %u.\n",
			daddr->sin_addr.s_addr, daddr->sin_port);
		err = -ENETUNREACH;
		goto err_out;
	}
	dst = &rt->dst;
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	n = dst_get_neighbour_noref(dst);
	if (!n) {
		err = -ENODEV;
		goto rel_rt;
	}
	ndev = n->dev;
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	if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
		pr_info("multi-cast route %pI4, port %u, dev %s.\n",
			&daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
			ndev->name);
		err = -ENETUNREACH;
		goto rel_rt;
	}

	if (ndev->flags & IFF_LOOPBACK) {
		ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
		mtu = ndev->mtu;
		pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
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			n->dev->name, ndev->name, mtu);
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	}

	cdev = cxgbi_device_find_by_netdev(ndev, &port);
	if (!cdev) {
		pr_info("dst %pI4, %s, NOT cxgbi device.\n",
			&daddr->sin_addr.s_addr, ndev->name);
		err = -ENETUNREACH;
		goto rel_rt;
	}
	log_debug(1 << CXGBI_DBG_SOCK,
		"route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
		&daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
			   port, ndev->name, cdev);

	csk = cxgbi_sock_create(cdev);
	if (!csk) {
		err = -ENOMEM;
		goto rel_rt;
	}
	csk->cdev = cdev;
	csk->port_id = port;
	csk->mtu = mtu;
	csk->dst = dst;
	csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
	csk->daddr.sin_port = daddr->sin_port;
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	csk->daddr.sin_family = daddr->sin_family;
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	csk->saddr.sin_addr.s_addr = fl4.saddr;
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	return csk;

rel_rt:
	ip_rt_put(rt);
	if (csk)
		cxgbi_sock_closed(csk);
err_out:
	return ERR_PTR(err);
}

void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
			unsigned int opt)
{
	csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
	dst_confirm(csk->dst);
	smp_mb();
	cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_established);

static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
{
	log_debug(1 << CXGBI_DBG_SOCK,
		"csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
		csk, csk->state, csk->flags, csk->user_data);

	if (csk->state != CTP_ESTABLISHED) {
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		read_lock_bh(&csk->callback_lock);
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		if (csk->user_data)
			iscsi_conn_failure(csk->user_data,
					ISCSI_ERR_CONN_FAILED);
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576
		read_unlock_bh(&csk->callback_lock);
577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824
	}
}

void cxgbi_sock_closed(struct cxgbi_sock *csk)
{
	log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
		csk, (csk)->state, (csk)->flags, (csk)->tid);
	cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
	if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
		return;
	if (csk->saddr.sin_port)
		sock_put_port(csk);
	if (csk->dst)
		dst_release(csk->dst);
	csk->cdev->csk_release_offload_resources(csk);
	cxgbi_sock_set_state(csk, CTP_CLOSED);
	cxgbi_inform_iscsi_conn_closing(csk);
	cxgbi_sock_put(csk);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_closed);

static void need_active_close(struct cxgbi_sock *csk)
{
	int data_lost;
	int close_req = 0;

	log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
		csk, (csk)->state, (csk)->flags, (csk)->tid);
	spin_lock_bh(&csk->lock);
	dst_confirm(csk->dst);
	data_lost = skb_queue_len(&csk->receive_queue);
	__skb_queue_purge(&csk->receive_queue);

	if (csk->state == CTP_ACTIVE_OPEN)
		cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
	else if (csk->state == CTP_ESTABLISHED) {
		close_req = 1;
		cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
	} else if (csk->state == CTP_PASSIVE_CLOSE) {
		close_req = 1;
		cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
	}

	if (close_req) {
		if (data_lost)
			csk->cdev->csk_send_abort_req(csk);
		else
			csk->cdev->csk_send_close_req(csk);
	}

	spin_unlock_bh(&csk->lock);
}

void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
{
	pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
			csk, csk->state, csk->flags,
			&csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
			&csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
			errno);

	cxgbi_sock_set_state(csk, CTP_CONNECTING);
	csk->err = errno;
	cxgbi_sock_closed(csk);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);

void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
{
	struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;

	log_debug(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);
	if (csk->state == CTP_ACTIVE_OPEN)
		cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
	spin_unlock_bh(&csk->lock);
	cxgbi_sock_put(csk);
	__kfree_skb(skb);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);

void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
{
	cxgbi_sock_get(csk);
	spin_lock_bh(&csk->lock);
	if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
		if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
			cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
		else {
			cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
			cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
			if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
				pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
					csk, csk->state, csk->flags, csk->tid);
			cxgbi_sock_closed(csk);
		}
	}
	spin_unlock_bh(&csk->lock);
	cxgbi_sock_put(csk);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);

void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
{
	log_debug(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);

	if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
		goto done;

	switch (csk->state) {
	case CTP_ESTABLISHED:
		cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
		break;
	case CTP_ACTIVE_CLOSE:
		cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
		break;
	case CTP_CLOSE_WAIT_1:
		cxgbi_sock_closed(csk);
		break;
	case CTP_ABORTING:
		break;
	default:
		pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
			csk, csk->state, csk->flags, csk->tid);
	}
	cxgbi_inform_iscsi_conn_closing(csk);
done:
	spin_unlock_bh(&csk->lock);
	cxgbi_sock_put(csk);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);

void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
{
	log_debug(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);

	csk->snd_una = snd_nxt - 1;
	if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
		goto done;

	switch (csk->state) {
	case CTP_ACTIVE_CLOSE:
		cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
		break;
	case CTP_CLOSE_WAIT_1:
	case CTP_CLOSE_WAIT_2:
		cxgbi_sock_closed(csk);
		break;
	case CTP_ABORTING:
		break;
	default:
		pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
			csk, csk->state, csk->flags, csk->tid);
	}
done:
	spin_unlock_bh(&csk->lock);
	cxgbi_sock_put(csk);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);

void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
			   unsigned int snd_una, int seq_chk)
{
	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
			"csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
			csk, csk->state, csk->flags, csk->tid, credits,
			csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);

	spin_lock_bh(&csk->lock);

	csk->wr_cred += credits;
	if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
		csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;

	while (credits) {
		struct sk_buff *p = cxgbi_sock_peek_wr(csk);

		if (unlikely(!p)) {
			pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
				csk, csk->state, csk->flags, csk->tid, credits,
				csk->wr_cred, csk->wr_una_cred);
			break;
		}

		if (unlikely(credits < p->csum)) {
			pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
				csk, csk->state, csk->flags, csk->tid,
				credits, csk->wr_cred, csk->wr_una_cred,
				p->csum);
			p->csum -= credits;
			break;
		} else {
			cxgbi_sock_dequeue_wr(csk);
			credits -= p->csum;
			kfree_skb(p);
		}
	}

	cxgbi_sock_check_wr_invariants(csk);

	if (seq_chk) {
		if (unlikely(before(snd_una, csk->snd_una))) {
			pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
				csk, csk->state, csk->flags, csk->tid, snd_una,
				csk->snd_una);
			goto done;
		}

		if (csk->snd_una != snd_una) {
			csk->snd_una = snd_una;
			dst_confirm(csk->dst);
		}
	}

	if (skb_queue_len(&csk->write_queue)) {
		if (csk->cdev->csk_push_tx_frames(csk, 0))
			cxgbi_conn_tx_open(csk);
	} else
		cxgbi_conn_tx_open(csk);
done:
	spin_unlock_bh(&csk->lock);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);

static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
					     unsigned short mtu)
{
	int i = 0;

	while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
		++i;

	return i;
}

unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
{
	unsigned int idx;
	struct dst_entry *dst = csk->dst;

825
	csk->advmss = dst_metric_advmss(dst);
826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 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 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 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 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 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 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286

	if (csk->advmss > pmtu - 40)
		csk->advmss = pmtu - 40;
	if (csk->advmss < csk->cdev->mtus[0] - 40)
		csk->advmss = csk->cdev->mtus[0] - 40;
	idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);

	return idx;
}
EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);

void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
{
	cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
	__skb_queue_tail(&csk->write_queue, skb);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);

void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
{
	struct sk_buff *skb;

	while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
		kfree_skb(skb);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);

void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
{
	int pending = cxgbi_sock_count_pending_wrs(csk);

	if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
		pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
			csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
}
EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);

static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
{
	struct cxgbi_device *cdev = csk->cdev;
	struct sk_buff *next;
	int err, copied = 0;

	spin_lock_bh(&csk->lock);

	if (csk->state != CTP_ESTABLISHED) {
		log_debug(1 << CXGBI_DBG_PDU_TX,
			"csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
			csk, csk->state, csk->flags, csk->tid);
		err = -EAGAIN;
		goto out_err;
	}

	if (csk->err) {
		log_debug(1 << CXGBI_DBG_PDU_TX,
			"csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
			csk, csk->state, csk->flags, csk->tid, csk->err);
		err = -EPIPE;
		goto out_err;
	}

	if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
		log_debug(1 << CXGBI_DBG_PDU_TX,
			"csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
			csk, csk->state, csk->flags, csk->tid, csk->write_seq,
			csk->snd_una, cdev->snd_win);
		err = -ENOBUFS;
		goto out_err;
	}

	while (skb) {
		int frags = skb_shinfo(skb)->nr_frags +
				(skb->len != skb->data_len);

		if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
			pr_err("csk 0x%p, skb head %u < %u.\n",
				csk, skb_headroom(skb), cdev->skb_tx_rsvd);
			err = -EINVAL;
			goto out_err;
		}

		if (frags >= SKB_WR_LIST_SIZE) {
			pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
				csk, skb_shinfo(skb)->nr_frags, skb->len,
				skb->data_len, (uint)(SKB_WR_LIST_SIZE));
			err = -EINVAL;
			goto out_err;
		}

		next = skb->next;
		skb->next = NULL;
		cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
		cxgbi_sock_skb_entail(csk, skb);
		copied += skb->len;
		csk->write_seq += skb->len +
				cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
		skb = next;
	}
done:
	if (likely(skb_queue_len(&csk->write_queue)))
		cdev->csk_push_tx_frames(csk, 1);
	spin_unlock_bh(&csk->lock);
	return copied;

out_err:
	if (copied == 0 && err == -EPIPE)
		copied = csk->err ? csk->err : -EPIPE;
	else
		copied = err;
	goto done;
}

/*
 * Direct Data Placement -
 * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
 * final destination host-memory buffers based on the Initiator Task Tag (ITT)
 * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
 * The host memory address is programmed into h/w in the format of pagepod
 * entries.
 * The location of the pagepod entry is encoded into ddp tag which is used as
 * the base for ITT/TTT.
 */

static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
static unsigned char page_idx = DDP_PGIDX_MAX;

static unsigned char sw_tag_idx_bits;
static unsigned char sw_tag_age_bits;

/*
 * Direct-Data Placement page size adjustment
 */
static int ddp_adjust_page_table(void)
{
	int i;
	unsigned int base_order, order;

	if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
		pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
			PAGE_SIZE, 1UL << ddp_page_shift[0]);
		return -EINVAL;
	}

	base_order = get_order(1UL << ddp_page_shift[0]);
	order = get_order(1UL << PAGE_SHIFT);

	for (i = 0; i < DDP_PGIDX_MAX; i++) {
		/* first is the kernel page size, then just doubling */
		ddp_page_order[i] = order - base_order + i;
		ddp_page_shift[i] = PAGE_SHIFT + i;
	}
	return 0;
}

static int ddp_find_page_index(unsigned long pgsz)
{
	int i;

	for (i = 0; i < DDP_PGIDX_MAX; i++) {
		if (pgsz == (1UL << ddp_page_shift[i]))
			return i;
	}
	pr_info("ddp page size %lu not supported.\n", pgsz);
	return DDP_PGIDX_MAX;
}

static void ddp_setup_host_page_size(void)
{
	if (page_idx == DDP_PGIDX_MAX) {
		page_idx = ddp_find_page_index(PAGE_SIZE);

		if (page_idx == DDP_PGIDX_MAX) {
			pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
			if (ddp_adjust_page_table() < 0) {
				pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
				return;
			}
			page_idx = ddp_find_page_index(PAGE_SIZE);
		}
		pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
	}
}

void cxgbi_ddp_page_size_factor(int *pgsz_factor)
{
	int i;

	for (i = 0; i < DDP_PGIDX_MAX; i++)
		pgsz_factor[i] = ddp_page_order[i];
}
EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);

/*
 * DDP setup & teardown
 */

void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
			struct cxgbi_pagepod_hdr *hdr,
			struct cxgbi_gather_list *gl, unsigned int gidx)
{
	int i;

	memcpy(ppod, hdr, sizeof(*hdr));
	for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
		ppod->addr[i] = gidx < gl->nelem ?
				cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
	}
}
EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);

void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
{
	memset(ppod, 0, sizeof(*ppod));
}
EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);

static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
					unsigned int start, unsigned int max,
					unsigned int count,
					struct cxgbi_gather_list *gl)
{
	unsigned int i, j, k;

	/*  not enough entries */
	if ((max - start) < count) {
		log_debug(1 << CXGBI_DBG_DDP,
			"NOT enough entries %u+%u < %u.\n", start, count, max);
		return -EBUSY;
	}

	max -= count;
	spin_lock(&ddp->map_lock);
	for (i = start; i < max;) {
		for (j = 0, k = i; j < count; j++, k++) {
			if (ddp->gl_map[k])
				break;
		}
		if (j == count) {
			for (j = 0, k = i; j < count; j++, k++)
				ddp->gl_map[k] = gl;
			spin_unlock(&ddp->map_lock);
			return i;
		}
		i += j + 1;
	}
	spin_unlock(&ddp->map_lock);
	log_debug(1 << CXGBI_DBG_DDP,
		"NO suitable entries %u available.\n", count);
	return -EBUSY;
}

static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
						int start, int count)
{
	spin_lock(&ddp->map_lock);
	memset(&ddp->gl_map[start], 0,
		count * sizeof(struct cxgbi_gather_list *));
	spin_unlock(&ddp->map_lock);
}

static inline void ddp_gl_unmap(struct pci_dev *pdev,
					struct cxgbi_gather_list *gl)
{
	int i;

	for (i = 0; i < gl->nelem; i++)
		dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
				PCI_DMA_FROMDEVICE);
}

static inline int ddp_gl_map(struct pci_dev *pdev,
				    struct cxgbi_gather_list *gl)
{
	int i;

	for (i = 0; i < gl->nelem; i++) {
		gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
						PAGE_SIZE,
						PCI_DMA_FROMDEVICE);
		if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
			log_debug(1 << CXGBI_DBG_DDP,
				"page %d 0x%p, 0x%p dma mapping err.\n",
				i, gl->pages[i], pdev);
			goto unmap;
		}
	}
	return i;
unmap:
	if (i) {
		unsigned int nelem = gl->nelem;

		gl->nelem = i;
		ddp_gl_unmap(pdev, gl);
		gl->nelem = nelem;
	}
	return -EINVAL;
}

static void ddp_release_gl(struct cxgbi_gather_list *gl,
				  struct pci_dev *pdev)
{
	ddp_gl_unmap(pdev, gl);
	kfree(gl);
}

static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
						    struct scatterlist *sgl,
						    unsigned int sgcnt,
						    struct pci_dev *pdev,
						    gfp_t gfp)
{
	struct cxgbi_gather_list *gl;
	struct scatterlist *sg = sgl;
	struct page *sgpage = sg_page(sg);
	unsigned int sglen = sg->length;
	unsigned int sgoffset = sg->offset;
	unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
				PAGE_SHIFT;
	int i = 1, j = 0;

	if (xferlen < DDP_THRESHOLD) {
		log_debug(1 << CXGBI_DBG_DDP,
			"xfer %u < threshold %u, no ddp.\n",
			xferlen, DDP_THRESHOLD);
		return NULL;
	}

	gl = kzalloc(sizeof(struct cxgbi_gather_list) +
		     npages * (sizeof(dma_addr_t) +
		     sizeof(struct page *)), gfp);
	if (!gl) {
		log_debug(1 << CXGBI_DBG_DDP,
			"xfer %u, %u pages, OOM.\n", xferlen, npages);
		return NULL;
	}

	 log_debug(1 << CXGBI_DBG_DDP,
		"xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);

	gl->pages = (struct page **)&gl->phys_addr[npages];
	gl->nelem = npages;
	gl->length = xferlen;
	gl->offset = sgoffset;
	gl->pages[0] = sgpage;

	for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
		i++, sg = sg_next(sg)) {
		struct page *page = sg_page(sg);

		if (sgpage == page && sg->offset == sgoffset + sglen)
			sglen += sg->length;
		else {
			/*  make sure the sgl is fit for ddp:
			 *  each has the same page size, and
			 *  all of the middle pages are used completely
			 */
			if ((j && sgoffset) || ((i != sgcnt - 1) &&
			    ((sglen + sgoffset) & ~PAGE_MASK))) {
				log_debug(1 << CXGBI_DBG_DDP,
					"page %d/%u, %u + %u.\n",
					i, sgcnt, sgoffset, sglen);
				goto error_out;
			}

			j++;
			if (j == gl->nelem || sg->offset) {
				log_debug(1 << CXGBI_DBG_DDP,
					"page %d/%u, offset %u.\n",
					j, gl->nelem, sg->offset);
				goto error_out;
			}
			gl->pages[j] = page;
			sglen = sg->length;
			sgoffset = sg->offset;
			sgpage = page;
		}
	}
	gl->nelem = ++j;

	if (ddp_gl_map(pdev, gl) < 0)
		goto error_out;

	return gl;

error_out:
	kfree(gl);
	return NULL;
}

static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
{
	struct cxgbi_device *cdev = chba->cdev;
	struct cxgbi_ddp_info *ddp = cdev->ddp;
	u32 idx;

	idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
	if (idx < ddp->nppods) {
		struct cxgbi_gather_list *gl = ddp->gl_map[idx];
		unsigned int npods;

		if (!gl || !gl->nelem) {
			pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
				tag, idx, gl, gl ? gl->nelem : 0);
			return;
		}
		npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
		log_debug(1 << CXGBI_DBG_DDP,
			"tag 0x%x, release idx %u, npods %u.\n",
			tag, idx, npods);
		cdev->csk_ddp_clear(chba, tag, idx, npods);
		ddp_unmark_entries(ddp, idx, npods);
		ddp_release_gl(gl, ddp->pdev);
	} else
		pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
}

static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
			   u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
			   gfp_t gfp)
{
	struct cxgbi_device *cdev = csk->cdev;
	struct cxgbi_ddp_info *ddp = cdev->ddp;
	struct cxgbi_tag_format *tformat = &cdev->tag_format;
	struct cxgbi_pagepod_hdr hdr;
	unsigned int npods;
	int idx = -1;
	int err = -ENOMEM;
	u32 tag;

	npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
	if (ddp->idx_last == ddp->nppods)
		idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
							npods, gl);
	else {
		idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
							ddp->nppods, npods,
							gl);
		if (idx < 0 && ddp->idx_last >= npods) {
			idx = ddp_find_unused_entries(ddp, 0,
				min(ddp->idx_last + npods, ddp->nppods),
							npods, gl);
		}
	}
	if (idx < 0) {
		log_debug(1 << CXGBI_DBG_DDP,
			"xferlen %u, gl %u, npods %u NO DDP.\n",
			gl->length, gl->nelem, npods);
		return idx;
	}

	tag = cxgbi_ddp_tag_base(tformat, sw_tag);
	tag |= idx << PPOD_IDX_SHIFT;

	hdr.rsvd = 0;
	hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
	hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
	hdr.max_offset = htonl(gl->length);
	hdr.page_offset = htonl(gl->offset);

	err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1287
	if (err < 0)
1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 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 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700
		goto unmark_entries;

	ddp->idx_last = idx;
	log_debug(1 << CXGBI_DBG_DDP,
		"xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
		gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
		npods);
	*tagp = tag;
	return 0;

unmark_entries:
	ddp_unmark_entries(ddp, idx, npods);
	return err;
}

int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
			unsigned int sw_tag, unsigned int xferlen,
			struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
{
	struct cxgbi_device *cdev = csk->cdev;
	struct cxgbi_tag_format *tformat = &cdev->tag_format;
	struct cxgbi_gather_list *gl;
	int err;

	if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
	    xferlen < DDP_THRESHOLD) {
		log_debug(1 << CXGBI_DBG_DDP,
			"pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
		return -EINVAL;
	}

	if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
		log_debug(1 << CXGBI_DBG_DDP,
			"sw_tag 0x%x NOT usable.\n", sw_tag);
		return -EINVAL;
	}

	gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
	if (!gl)
		return -ENOMEM;

	err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
	if (err < 0)
		ddp_release_gl(gl, cdev->pdev);

	return err;
}

static void ddp_destroy(struct kref *kref)
{
	struct cxgbi_ddp_info *ddp = container_of(kref,
						struct cxgbi_ddp_info,
						refcnt);
	struct cxgbi_device *cdev = ddp->cdev;
	int i = 0;

	pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);

	while (i < ddp->nppods) {
		struct cxgbi_gather_list *gl = ddp->gl_map[i];

		if (gl) {
			int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
					>> PPOD_PAGES_SHIFT;
			pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
			kfree(gl);
			i += npods;
		} else
			i++;
	}
	cxgbi_free_big_mem(ddp);
}

int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
{
	struct cxgbi_ddp_info *ddp = cdev->ddp;

	log_debug(1 << CXGBI_DBG_DDP,
		"cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
	cdev->ddp = NULL;
	if (ddp)
		return kref_put(&ddp->refcnt, ddp_destroy);
	return 0;
}
EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);

int cxgbi_ddp_init(struct cxgbi_device *cdev,
		   unsigned int llimit, unsigned int ulimit,
		   unsigned int max_txsz, unsigned int max_rxsz)
{
	struct cxgbi_ddp_info *ddp;
	unsigned int ppmax, bits;

	ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
	bits = __ilog2_u32(ppmax) + 1;
	if (bits > PPOD_IDX_MAX_SIZE)
		bits = PPOD_IDX_MAX_SIZE;
	ppmax = (1 << (bits - 1)) - 1;

	ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
				ppmax * (sizeof(struct cxgbi_gather_list *) +
					 sizeof(struct sk_buff *)),
				GFP_KERNEL);
	if (!ddp) {
		pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
		return -ENOMEM;
	}
	ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
	cdev->ddp = ddp;

	spin_lock_init(&ddp->map_lock);
	kref_init(&ddp->refcnt);

	ddp->cdev = cdev;
	ddp->pdev = cdev->pdev;
	ddp->llimit = llimit;
	ddp->ulimit = ulimit;
	ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
	ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
	ddp->nppods = ppmax;
	ddp->idx_last = ppmax;
	ddp->idx_bits = bits;
	ddp->idx_mask = (1 << bits) - 1;
	ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;

	cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
	cdev->tag_format.rsvd_bits = ddp->idx_bits;
	cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
	cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;

	pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
		cdev->ports[0]->name, cdev->tag_format.sw_bits,
		cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
		cdev->tag_format.rsvd_mask);

	cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
				ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
	cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
				ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);

	log_debug(1 << CXGBI_DBG_DDP,
		"%s max payload size: %u/%u, %u/%u.\n",
		cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
		cdev->rx_max_size, ddp->max_rxsz);
	return 0;
}
EXPORT_SYMBOL_GPL(cxgbi_ddp_init);

/*
 * APIs interacting with open-iscsi libraries
 */

static unsigned char padding[4];

static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
{
	struct scsi_cmnd *sc = task->sc;
	struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
	struct cxgbi_conn *cconn = tcp_conn->dd_data;
	struct cxgbi_hba *chba = cconn->chba;
	struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
	u32 tag = ntohl((__force u32)hdr_itt);

	log_debug(1 << CXGBI_DBG_DDP,
		   "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
	if (sc &&
	    (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
	    cxgbi_is_ddp_tag(tformat, tag))
		ddp_tag_release(chba, tag);
}

static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
{
	struct scsi_cmnd *sc = task->sc;
	struct iscsi_conn *conn = task->conn;
	struct iscsi_session *sess = conn->session;
	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
	struct cxgbi_conn *cconn = tcp_conn->dd_data;
	struct cxgbi_hba *chba = cconn->chba;
	struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
	u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
	u32 tag = 0;
	int err = -EINVAL;

	if (sc &&
	    (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
		err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
					scsi_in(sc)->length,
					scsi_in(sc)->table.sgl,
					scsi_in(sc)->table.nents,
					GFP_ATOMIC);
		if (err < 0)
			log_debug(1 << CXGBI_DBG_DDP,
				"csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
				cconn->cep->csk, task, scsi_in(sc)->length,
				scsi_in(sc)->table.nents);
	}

	if (err < 0)
		tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
	/*  the itt need to sent in big-endian order */
	*hdr_itt = (__force itt_t)htonl(tag);

	log_debug(1 << CXGBI_DBG_DDP,
		"cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
		chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
	return 0;
}

void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
{
	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
	struct cxgbi_conn *cconn = tcp_conn->dd_data;
	struct cxgbi_device *cdev = cconn->chba->cdev;
	u32 tag = ntohl((__force u32) itt);
	u32 sw_bits;

	sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
	if (idx)
		*idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
	if (age)
		*age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;

	log_debug(1 << CXGBI_DBG_DDP,
		"cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
		cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
		age ? *age : 0xFF);
}
EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);

void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
{
	struct iscsi_conn *conn = csk->user_data;

	if (conn) {
		log_debug(1 << CXGBI_DBG_SOCK,
			"csk 0x%p, cid %d.\n", csk, conn->id);
		iscsi_conn_queue_work(conn);
	}
}
EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);

/*
 * pdu receive, interact with libiscsi_tcp
 */
static inline int read_pdu_skb(struct iscsi_conn *conn,
			       struct sk_buff *skb,
			       unsigned int offset,
			       int offloaded)
{
	int status = 0;
	int bytes_read;

	bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
	switch (status) {
	case ISCSI_TCP_CONN_ERR:
		pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
			  skb, offset, offloaded);
		return -EIO;
	case ISCSI_TCP_SUSPENDED:
		log_debug(1 << CXGBI_DBG_PDU_RX,
			"skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
			skb, offset, offloaded, bytes_read);
		/* no transfer - just have caller flush queue */
		return bytes_read;
	case ISCSI_TCP_SKB_DONE:
		pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
			skb, offset, offloaded);
		/*
		 * pdus should always fit in the skb and we should get
		 * segment done notifcation.
		 */
		iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
		return -EFAULT;
	case ISCSI_TCP_SEGMENT_DONE:
		log_debug(1 << CXGBI_DBG_PDU_RX,
			"skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
			skb, offset, offloaded, bytes_read);
		return bytes_read;
	default:
		pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
			skb, offset, offloaded, status);
		return -EINVAL;
	}
}

static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
{
	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;

	log_debug(1 << CXGBI_DBG_PDU_RX,
		"conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
		conn, skb, skb->len, cxgbi_skcb_flags(skb));

	if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
		pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
		iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
		return -EIO;
	}

	if (conn->hdrdgst_en &&
	    cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
		pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
		iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
		return -EIO;
	}

	return read_pdu_skb(conn, skb, 0, 0);
}

static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
			     struct sk_buff *skb, unsigned int offset)
{
	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
	bool offloaded = 0;
	int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;

	log_debug(1 << CXGBI_DBG_PDU_RX,
		"conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
		conn, skb, skb->len, cxgbi_skcb_flags(skb));

	if (conn->datadgst_en &&
	    cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
		pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
			conn, lskb, cxgbi_skcb_flags(lskb));
		iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
		return -EIO;
	}

	if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
		return 0;

	/* coalesced, add header digest length */
	if (lskb == skb && conn->hdrdgst_en)
		offset += ISCSI_DIGEST_SIZE;

	if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
		offloaded = 1;

	if (opcode == ISCSI_OP_SCSI_DATA_IN)
		log_debug(1 << CXGBI_DBG_PDU_RX,
			"skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
			skb, opcode, ntohl(tcp_conn->in.hdr->itt),
			tcp_conn->in.datalen, offloaded ? "is" : "not");

	return read_pdu_skb(conn, skb, offset, offloaded);
}

static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
{
	struct cxgbi_device *cdev = csk->cdev;
	int must_send;
	u32 credits;

	log_debug(1 << CXGBI_DBG_PDU_RX,
		"csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n",
		csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
		csk->rcv_wup, cdev->rx_credit_thres,
		cdev->rcv_win);

	if (csk->state != CTP_ESTABLISHED)
		return;

	credits = csk->copied_seq - csk->rcv_wup;
	if (unlikely(!credits))
		return;
	if (unlikely(cdev->rx_credit_thres == 0))
		return;

	must_send = credits + 16384 >= cdev->rcv_win;
	if (must_send || credits >= cdev->rx_credit_thres)
		csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
}

void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
{
	struct cxgbi_device *cdev = csk->cdev;
	struct iscsi_conn *conn = csk->user_data;
	struct sk_buff *skb;
	unsigned int read = 0;
	int err = 0;

	log_debug(1 << CXGBI_DBG_PDU_RX,
		"csk 0x%p, conn 0x%p.\n", csk, conn);

	if (unlikely(!conn || conn->suspend_rx)) {
		log_debug(1 << CXGBI_DBG_PDU_RX,
			"csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
			csk, conn, conn ? conn->id : 0xFF,
			conn ? conn->suspend_rx : 0xFF);
		return;
	}

	while (!err) {
		skb = skb_peek(&csk->receive_queue);
		if (!skb ||
		    !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
			if (skb)
				log_debug(1 << CXGBI_DBG_PDU_RX,
					"skb 0x%p, NOT ready 0x%lx.\n",
					skb, cxgbi_skcb_flags(skb));
			break;
		}
		__skb_unlink(skb, &csk->receive_queue);

		read += cxgbi_skcb_rx_pdulen(skb);
		log_debug(1 << CXGBI_DBG_PDU_RX,
			"csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
			csk, skb, skb->len, cxgbi_skcb_flags(skb),
			cxgbi_skcb_rx_pdulen(skb));

		if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
			err = skb_read_pdu_bhs(conn, skb);
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			if (err < 0) {
				pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
					"f 0x%lx, plen %u.\n",
					csk, skb, skb->len,
					cxgbi_skcb_flags(skb),
					cxgbi_skcb_rx_pdulen(skb));
				goto skb_done;
			}
1709 1710
			err = skb_read_pdu_data(conn, skb, skb,
						err + cdev->skb_rx_extra);
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			if (err < 0)
				pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
					"f 0x%lx, plen %u.\n",
					csk, skb, skb->len,
					cxgbi_skcb_flags(skb),
					cxgbi_skcb_rx_pdulen(skb));
1717 1718
		} else {
			err = skb_read_pdu_bhs(conn, skb);
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			if (err < 0) {
				pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
					"f 0x%lx, plen %u.\n",
					csk, skb, skb->len,
					cxgbi_skcb_flags(skb),
					cxgbi_skcb_rx_pdulen(skb));
				goto skb_done;
			}

1728 1729 1730 1731 1732
			if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
				struct sk_buff *dskb;

				dskb = skb_peek(&csk->receive_queue);
				if (!dskb) {
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					pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
						" plen %u, NO data.\n",
						csk, skb, skb->len,
						cxgbi_skcb_flags(skb),
						cxgbi_skcb_rx_pdulen(skb));
					err = -EIO;
					goto skb_done;
1740 1741 1742 1743
				}
				__skb_unlink(dskb, &csk->receive_queue);

				err = skb_read_pdu_data(conn, skb, dskb, 0);
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				if (err < 0)
					pr_err("data, csk 0x%p, skb 0x%p,%u, "
						"f 0x%lx, plen %u, dskb 0x%p,"
						"%u.\n",
						csk, skb, skb->len,
						cxgbi_skcb_flags(skb),
						cxgbi_skcb_rx_pdulen(skb),
						dskb, dskb->len);
1752 1753 1754 1755
				__kfree_skb(dskb);
			} else
				err = skb_read_pdu_data(conn, skb, skb, 0);
		}
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skb_done:
		__kfree_skb(skb);

1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770
		if (err < 0)
			break;
	}

	log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
	if (read) {
		csk->copied_seq += read;
		csk_return_rx_credits(csk, read);
		conn->rxdata_octets += read;
	}

	if (err < 0) {
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		pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
			csk, conn, err, read);
1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796
		iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
	}
}
EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);

static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
				unsigned int offset, unsigned int *off,
				struct scatterlist **sgp)
{
	int i;
	struct scatterlist *sg;

	for_each_sg(sgl, sg, sgcnt, i) {
		if (offset < sg->length) {
			*off = offset;
			*sgp = sg;
			return 0;
		}
		offset -= sg->length;
	}
	return -EFAULT;
}

static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1797
				unsigned int dlen, struct page_frag *frags,
1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823
				int frag_max)
{
	unsigned int datalen = dlen;
	unsigned int sglen = sg->length - sgoffset;
	struct page *page = sg_page(sg);
	int i;

	i = 0;
	do {
		unsigned int copy;

		if (!sglen) {
			sg = sg_next(sg);
			if (!sg) {
				pr_warn("sg %d NULL, len %u/%u.\n",
					i, datalen, dlen);
				return -EINVAL;
			}
			sgoffset = 0;
			sglen = sg->length;
			page = sg_page(sg);

		}
		copy = min(datalen, sglen);
		if (i && page == frags[i - 1].page &&
		    sgoffset + sg->offset ==
1824 1825
			frags[i - 1].offset + frags[i - 1].size) {
			frags[i - 1].size += copy;
1826 1827 1828 1829 1830 1831 1832 1833
		} else {
			if (i >= frag_max) {
				pr_warn("too many pages %u, dlen %u.\n",
					frag_max, dlen);
				return -EINVAL;
			}

			frags[i].page = page;
1834 1835
			frags[i].offset = sg->offset + sgoffset;
			frags[i].size = copy;
1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852
			i++;
		}
		datalen -= copy;
		sgoffset += copy;
		sglen -= copy;
	} while (datalen);

	return i;
}

int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
{
	struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
	struct cxgbi_conn *cconn = tcp_conn->dd_data;
	struct cxgbi_device *cdev = cconn->chba->cdev;
	struct iscsi_conn *conn = task->conn;
	struct iscsi_tcp_task *tcp_task = task->dd_data;
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	struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870
	struct scsi_cmnd *sc = task->sc;
	int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;

	tcp_task->dd_data = tdata;
	task->hdr = NULL;

	if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
	    (opcode == ISCSI_OP_SCSI_DATA_OUT ||
	     (opcode == ISCSI_OP_SCSI_CMD &&
	      (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
		/* data could goes into skb head */
		headroom += min_t(unsigned int,
				SKB_MAX_HEAD(cdev->skb_tx_rsvd),
				conn->max_xmit_dlength);

	tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
	if (!tdata->skb) {
1871 1872 1873
		struct cxgbi_sock *csk = cconn->cep->csk;
		struct net_device *ndev = cdev->ports[csk->port_id];
		ndev->stats.tx_dropped++;
1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895
		return -ENOMEM;
	}

	skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
	task->hdr = (struct iscsi_hdr *)tdata->skb->data;
	task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */

	/* data_out uses scsi_cmd's itt */
	if (opcode != ISCSI_OP_SCSI_DATA_OUT)
		task_reserve_itt(task, &task->hdr->itt);

	log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
		"task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
		task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
		conn->max_xmit_dlength, ntohl(task->hdr->itt));

	return 0;
}
EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);

static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
{
1896 1897
	if (hcrc || dcrc) {
		u8 submode = 0;
1898

1899 1900 1901 1902 1903 1904 1905
		if (hcrc)
			submode |= 1;
		if (dcrc)
			submode |= 2;
		cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
	} else
		cxgbi_skcb_ulp_mode(skb) = 0;
1906 1907 1908 1909 1910 1911
}

int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
			      unsigned int count)
{
	struct iscsi_conn *conn = task->conn;
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	struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954
	struct sk_buff *skb = tdata->skb;
	unsigned int datalen = count;
	int i, padlen = iscsi_padding(count);
	struct page *pg;

	log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
		"task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
		task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
		ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);

	skb_put(skb, task->hdr_len);
	tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
	if (!count)
		return 0;

	if (task->sc) {
		struct scsi_data_buffer *sdb = scsi_out(task->sc);
		struct scatterlist *sg = NULL;
		int err;

		tdata->offset = offset;
		tdata->count = count;
		err = sgl_seek_offset(
					sdb->table.sgl, sdb->table.nents,
					tdata->offset, &tdata->sgoffset, &sg);
		if (err < 0) {
			pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
				sdb->table.nents, tdata->offset, sdb->length);
			return err;
		}
		err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
					tdata->frags, MAX_PDU_FRAGS);
		if (err < 0) {
			pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
				sdb->table.nents, tdata->offset, tdata->count);
			return err;
		}
		tdata->nr_frags = err;

		if (tdata->nr_frags > MAX_SKB_FRAGS ||
		    (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
			char *dst = skb->data + task->hdr_len;
1955
			struct page_frag *frag = tdata->frags;
1956 1957 1958 1959 1960 1961

			/* data fits in the skb's headroom */
			for (i = 0; i < tdata->nr_frags; i++, frag++) {
				char *src = kmap_atomic(frag->page,
							KM_SOFTIRQ0);

1962 1963
				memcpy(dst, src+frag->offset, frag->size);
				dst += frag->size;
1964 1965 1966 1967 1968 1969 1970 1971 1972
				kunmap_atomic(src, KM_SOFTIRQ0);
			}
			if (padlen) {
				memset(dst, 0, padlen);
				padlen = 0;
			}
			skb_put(skb, count + padlen);
		} else {
			/* data fit into frag_list */
1973 1974 1975 1976 1977 1978 1979
			for (i = 0; i < tdata->nr_frags; i++) {
				__skb_fill_page_desc(skb, i,
						tdata->frags[i].page,
						tdata->frags[i].offset,
						tdata->frags[i].size);
				skb_frag_ref(skb, i);
			}
1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015
			skb_shinfo(skb)->nr_frags = tdata->nr_frags;
			skb->len += count;
			skb->data_len += count;
			skb->truesize += count;
		}

	} else {
		pg = virt_to_page(task->data);

		get_page(pg);
		skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
					count);
		skb->len += count;
		skb->data_len += count;
		skb->truesize += count;
	}

	if (padlen) {
		i = skb_shinfo(skb)->nr_frags;
		skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
				virt_to_page(padding), offset_in_page(padding),
				padlen);

		skb->data_len += padlen;
		skb->truesize += padlen;
		skb->len += padlen;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);

int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
{
	struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
	struct cxgbi_conn *cconn = tcp_conn->dd_data;
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	struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067
	struct sk_buff *skb = tdata->skb;
	unsigned int datalen;
	int err;

	if (!skb) {
		log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
			"task 0x%p, skb NULL.\n", task);
		return 0;
	}

	datalen = skb->data_len;
	tdata->skb = NULL;
	err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
	if (err > 0) {
		int pdulen = err;

		log_debug(1 << CXGBI_DBG_PDU_TX,
			"task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
			task, task->sc, skb, skb->len, skb->data_len, err);

		if (task->conn->hdrdgst_en)
			pdulen += ISCSI_DIGEST_SIZE;

		if (datalen && task->conn->datadgst_en)
			pdulen += ISCSI_DIGEST_SIZE;

		task->conn->txdata_octets += pdulen;
		return 0;
	}

	if (err == -EAGAIN || err == -ENOBUFS) {
		log_debug(1 << CXGBI_DBG_PDU_TX,
			"task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
			task, skb, skb->len, skb->data_len, err);
		/* reset skb to send when we are called again */
		tdata->skb = skb;
		return err;
	}

	kfree_skb(skb);
	log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
		"itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
		task->itt, skb, skb->len, skb->data_len, err);
	iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
	iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
	return err;
}
EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);

void cxgbi_cleanup_task(struct iscsi_task *task)
{
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kxie@chelsio.com 已提交
2068
	struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202

	log_debug(1 << CXGBI_DBG_ISCSI,
		"task 0x%p, skb 0x%p, itt 0x%x.\n",
		task, tdata->skb, task->hdr_itt);

	/*  never reached the xmit task callout */
	if (tdata->skb)
		__kfree_skb(tdata->skb);
	memset(tdata, 0, sizeof(*tdata));

	task_release_itt(task, task->hdr_itt);
	iscsi_tcp_cleanup_task(task);
}
EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);

void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
				struct iscsi_stats *stats)
{
	struct iscsi_conn *conn = cls_conn->dd_data;

	stats->txdata_octets = conn->txdata_octets;
	stats->rxdata_octets = conn->rxdata_octets;
	stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
	stats->dataout_pdus = conn->dataout_pdus_cnt;
	stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
	stats->datain_pdus = conn->datain_pdus_cnt;
	stats->r2t_pdus = conn->r2t_pdus_cnt;
	stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
	stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
	stats->digest_err = 0;
	stats->timeout_err = 0;
	stats->custom_length = 1;
	strcpy(stats->custom[0].desc, "eh_abort_cnt");
	stats->custom[0].value = conn->eh_abort_cnt;
}
EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);

static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
{
	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
	struct cxgbi_conn *cconn = tcp_conn->dd_data;
	struct cxgbi_device *cdev = cconn->chba->cdev;
	unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
	unsigned int max_def = 512 * MAX_SKB_FRAGS;
	unsigned int max = max(max_def, headroom);

	max = min(cconn->chba->cdev->tx_max_size, max);
	if (conn->max_xmit_dlength)
		conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
	else
		conn->max_xmit_dlength = max;
	cxgbi_align_pdu_size(conn->max_xmit_dlength);

	return 0;
}

static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
{
	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
	struct cxgbi_conn *cconn = tcp_conn->dd_data;
	unsigned int max = cconn->chba->cdev->rx_max_size;

	cxgbi_align_pdu_size(max);

	if (conn->max_recv_dlength) {
		if (conn->max_recv_dlength > max) {
			pr_err("MaxRecvDataSegmentLength %u > %u.\n",
				conn->max_recv_dlength, max);
			return -EINVAL;
		}
		conn->max_recv_dlength = min(conn->max_recv_dlength, max);
		cxgbi_align_pdu_size(conn->max_recv_dlength);
	} else
		conn->max_recv_dlength = max;

	return 0;
}

int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
			enum iscsi_param param, char *buf, int buflen)
{
	struct iscsi_conn *conn = cls_conn->dd_data;
	struct iscsi_session *session = conn->session;
	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
	struct cxgbi_conn *cconn = tcp_conn->dd_data;
	struct cxgbi_sock *csk = cconn->cep->csk;
	int value, err = 0;

	log_debug(1 << CXGBI_DBG_ISCSI,
		"cls_conn 0x%p, param %d, buf(%d) %s.\n",
		cls_conn, param, buflen, buf);

	switch (param) {
	case ISCSI_PARAM_HDRDGST_EN:
		err = iscsi_set_param(cls_conn, param, buf, buflen);
		if (!err && conn->hdrdgst_en)
			err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
							conn->hdrdgst_en,
							conn->datadgst_en, 0);
		break;
	case ISCSI_PARAM_DATADGST_EN:
		err = iscsi_set_param(cls_conn, param, buf, buflen);
		if (!err && conn->datadgst_en)
			err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
							conn->hdrdgst_en,
							conn->datadgst_en, 0);
		break;
	case ISCSI_PARAM_MAX_R2T:
		sscanf(buf, "%d", &value);
		if (value <= 0 || !is_power_of_2(value))
			return -EINVAL;
		if (session->max_r2t == value)
			break;
		iscsi_tcp_r2tpool_free(session);
		err = iscsi_set_param(cls_conn, param, buf, buflen);
		if (!err && iscsi_tcp_r2tpool_alloc(session))
			return -ENOMEM;
	case ISCSI_PARAM_MAX_RECV_DLENGTH:
		err = iscsi_set_param(cls_conn, param, buf, buflen);
		if (!err)
			err = cxgbi_conn_max_recv_dlength(conn);
		break;
	case ISCSI_PARAM_MAX_XMIT_DLENGTH:
		err = iscsi_set_param(cls_conn, param, buf, buflen);
		if (!err)
			err = cxgbi_conn_max_xmit_dlength(conn);
		break;
	default:
		return iscsi_set_param(cls_conn, param, buf, buflen);
	}
	return err;
}
EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);

2203 2204
int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
		       char *buf)
2205
{
2206 2207
	struct cxgbi_endpoint *cep = ep->dd_data;
	struct cxgbi_sock *csk;
2208 2209 2210
	int len;

	log_debug(1 << CXGBI_DBG_ISCSI,
2211
		"cls_conn 0x%p, param %d.\n", ep, param);
2212 2213 2214 2215

	switch (param) {
	case ISCSI_PARAM_CONN_PORT:
	case ISCSI_PARAM_CONN_ADDRESS:
2216 2217 2218 2219 2220 2221 2222 2223 2224
		if (!cep)
			return -ENOTCONN;

		csk = cep->csk;
		if (!csk)
			return -ENOTCONN;

		return iscsi_conn_get_addr_param((struct sockaddr_storage *)
						 &csk->daddr, param, buf);
2225
	default:
2226
		return -ENOSYS;
2227 2228 2229
	}
	return len;
}
2230
EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286

struct iscsi_cls_conn *
cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
{
	struct iscsi_cls_conn *cls_conn;
	struct iscsi_conn *conn;
	struct iscsi_tcp_conn *tcp_conn;
	struct cxgbi_conn *cconn;

	cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
	if (!cls_conn)
		return NULL;

	conn = cls_conn->dd_data;
	tcp_conn = conn->dd_data;
	cconn = tcp_conn->dd_data;
	cconn->iconn = conn;

	log_debug(1 << CXGBI_DBG_ISCSI,
		"cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
		cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);

	return cls_conn;
}
EXPORT_SYMBOL_GPL(cxgbi_create_conn);

int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
				struct iscsi_cls_conn *cls_conn,
				u64 transport_eph, int is_leading)
{
	struct iscsi_conn *conn = cls_conn->dd_data;
	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
	struct cxgbi_conn *cconn = tcp_conn->dd_data;
	struct iscsi_endpoint *ep;
	struct cxgbi_endpoint *cep;
	struct cxgbi_sock *csk;
	int err;

	ep = iscsi_lookup_endpoint(transport_eph);
	if (!ep)
		return -EINVAL;

	/*  setup ddp pagesize */
	cep = ep->dd_data;
	csk = cep->csk;
	err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
	if (err < 0)
		return err;

	err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
	if (err)
		return -EINVAL;

	/*  calculate the tag idx bits needed for this conn based on cmds_max */
	cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;

K
kxie@chelsio.com 已提交
2287
	write_lock_bh(&csk->callback_lock);
2288 2289 2290 2291
	csk->user_data = conn;
	cconn->chba = cep->chba;
	cconn->cep = cep;
	cep->cconn = cconn;
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kxie@chelsio.com 已提交
2292
	write_unlock_bh(&csk->callback_lock);
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	cxgbi_conn_max_xmit_dlength(conn);
	cxgbi_conn_max_recv_dlength(conn);

	log_debug(1 << CXGBI_DBG_ISCSI,
		"cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
		cls_session, cls_conn, ep, cconn, csk);
	/*  init recv engine */
	iscsi_tcp_hdr_recv_prep(tcp_conn);

	return 0;
}
EXPORT_SYMBOL_GPL(cxgbi_bind_conn);

struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
						u16 cmds_max, u16 qdepth,
						u32 initial_cmdsn)
{
	struct cxgbi_endpoint *cep;
	struct cxgbi_hba *chba;
	struct Scsi_Host *shost;
	struct iscsi_cls_session *cls_session;
	struct iscsi_session *session;

	if (!ep) {
		pr_err("missing endpoint.\n");
		return NULL;
	}

	cep = ep->dd_data;
	chba = cep->chba;
	shost = chba->shost;

	BUG_ON(chba != iscsi_host_priv(shost));

	cls_session = iscsi_session_setup(chba->cdev->itp, shost,
					cmds_max, 0,
					sizeof(struct iscsi_tcp_task) +
					sizeof(struct cxgbi_task_data),
					initial_cmdsn, ISCSI_MAX_TARGET);
	if (!cls_session)
		return NULL;

	session = cls_session->dd_data;
	if (iscsi_tcp_r2tpool_alloc(session))
		goto remove_session;

	log_debug(1 << CXGBI_DBG_ISCSI,
		"ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
	return cls_session;

remove_session:
	iscsi_session_teardown(cls_session);
	return NULL;
}
EXPORT_SYMBOL_GPL(cxgbi_create_session);

void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
{
	log_debug(1 << CXGBI_DBG_ISCSI,
		"cls sess 0x%p.\n", cls_session);

	iscsi_tcp_r2tpool_free(cls_session->dd_data);
	iscsi_session_teardown(cls_session);
}
EXPORT_SYMBOL_GPL(cxgbi_destroy_session);

int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
			char *buf, int buflen)
{
	struct cxgbi_hba *chba = iscsi_host_priv(shost);

	if (!chba->ndev) {
		shost_printk(KERN_ERR, shost, "Could not get host param. "
				"netdev for host not set.\n");
		return -ENODEV;
	}

	log_debug(1 << CXGBI_DBG_ISCSI,
		"shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
		shost, chba, chba->ndev->name, param, buflen, buf);

	switch (param) {
	case ISCSI_HOST_PARAM_IPADDRESS:
	{
		__be32 addr = in_aton(buf);
		log_debug(1 << CXGBI_DBG_ISCSI,
			"hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
		cxgbi_set_iscsi_ipv4(chba, addr);
		return 0;
	}
	case ISCSI_HOST_PARAM_HWADDRESS:
	case ISCSI_HOST_PARAM_NETDEV_NAME:
		return 0;
	default:
		return iscsi_host_set_param(shost, param, buf, buflen);
	}
}
EXPORT_SYMBOL_GPL(cxgbi_set_host_param);

int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
			char *buf)
{
	struct cxgbi_hba *chba = iscsi_host_priv(shost);
	int len = 0;

	if (!chba->ndev) {
		shost_printk(KERN_ERR, shost, "Could not get host param. "
				"netdev for host not set.\n");
		return -ENODEV;
	}

	log_debug(1 << CXGBI_DBG_ISCSI,
		"shost 0x%p, hba 0x%p,%s, param %d.\n",
		shost, chba, chba->ndev->name, param);

	switch (param) {
	case ISCSI_HOST_PARAM_HWADDRESS:
		len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
		break;
	case ISCSI_HOST_PARAM_NETDEV_NAME:
		len = sprintf(buf, "%s\n", chba->ndev->name);
		break;
	case ISCSI_HOST_PARAM_IPADDRESS:
	{
		__be32 addr;

		addr = cxgbi_get_iscsi_ipv4(chba);
		len = sprintf(buf, "%pI4", &addr);
		log_debug(1 << CXGBI_DBG_ISCSI,
			"hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
		break;
	}
	default:
		return iscsi_host_get_param(shost, param, buf);
	}

	return len;
}
EXPORT_SYMBOL_GPL(cxgbi_get_host_param);

struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
					struct sockaddr *dst_addr,
					int non_blocking)
{
	struct iscsi_endpoint *ep;
	struct cxgbi_endpoint *cep;
	struct cxgbi_hba *hba = NULL;
	struct cxgbi_sock *csk;
	int err = -EINVAL;

	log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
		"shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
		shost, non_blocking, dst_addr);

	if (shost) {
		hba = iscsi_host_priv(shost);
		if (!hba) {
			pr_info("shost 0x%p, priv NULL.\n", shost);
			goto err_out;
		}
	}

	csk = cxgbi_check_route(dst_addr);
	if (IS_ERR(csk))
		return (struct iscsi_endpoint *)csk;
	cxgbi_sock_get(csk);

	if (!hba)
		hba = csk->cdev->hbas[csk->port_id];
	else if (hba != csk->cdev->hbas[csk->port_id]) {
		pr_info("Could not connect through requested host %u"
			"hba 0x%p != 0x%p (%u).\n",
			shost->host_no, hba,
			csk->cdev->hbas[csk->port_id], csk->port_id);
		err = -ENOSPC;
		goto release_conn;
	}

	err = sock_get_port(csk);
	if (err)
		goto release_conn;

	cxgbi_sock_set_state(csk, CTP_CONNECTING);
	err = csk->cdev->csk_init_act_open(csk);
	if (err)
		goto release_conn;

	if (cxgbi_sock_is_closing(csk)) {
		err = -ENOSPC;
		pr_info("csk 0x%p is closing.\n", csk);
		goto release_conn;
	}

	ep = iscsi_create_endpoint(sizeof(*cep));
	if (!ep) {
		err = -ENOMEM;
		pr_info("iscsi alloc ep, OOM.\n");
		goto release_conn;
	}

	cep = ep->dd_data;
	cep->csk = csk;
	cep->chba = hba;

	log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
		"ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
		ep, cep, csk, hba, hba->ndev->name);
	return ep;

release_conn:
	cxgbi_sock_put(csk);
	cxgbi_sock_closed(csk);
err_out:
	return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(cxgbi_ep_connect);

int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
{
	struct cxgbi_endpoint *cep = ep->dd_data;
	struct cxgbi_sock *csk = cep->csk;

	if (!cxgbi_sock_is_established(csk))
		return 0;
	return 1;
}
EXPORT_SYMBOL_GPL(cxgbi_ep_poll);

void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
{
	struct cxgbi_endpoint *cep = ep->dd_data;
	struct cxgbi_conn *cconn = cep->cconn;
	struct cxgbi_sock *csk = cep->csk;

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

	if (cconn && cconn->iconn) {
		iscsi_suspend_tx(cconn->iconn);
		write_lock_bh(&csk->callback_lock);
		cep->csk->user_data = NULL;
		cconn->cep = NULL;
		write_unlock_bh(&csk->callback_lock);
	}
	iscsi_destroy_endpoint(ep);

	if (likely(csk->state >= CTP_ESTABLISHED))
		need_active_close(csk);
	else
		cxgbi_sock_closed(csk);

	cxgbi_sock_put(csk);
}
EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);

int cxgbi_iscsi_init(struct iscsi_transport *itp,
			struct scsi_transport_template **stt)
{
	*stt = iscsi_register_transport(itp);
	if (*stt == NULL) {
		pr_err("unable to register %s transport 0x%p.\n",
			itp->name, itp);
		return -ENODEV;
	}
	log_debug(1 << CXGBI_DBG_ISCSI,
		"%s, registered iscsi transport 0x%p.\n",
		itp->name, stt);
	return 0;
}
EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);

void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
			struct scsi_transport_template **stt)
{
	if (*stt) {
		log_debug(1 << CXGBI_DBG_ISCSI,
			"de-register transport 0x%p, %s, stt 0x%p.\n",
			itp, itp->name, *stt);
		*stt = NULL;
		iscsi_unregister_transport(itp);
	}
}
EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);

2579
umode_t cxgbi_attr_is_visible(int param_type, int param)
2580 2581
{
	switch (param_type) {
2582 2583 2584 2585 2586 2587 2588 2589 2590 2591
	case ISCSI_HOST_PARAM:
		switch (param) {
		case ISCSI_HOST_PARAM_NETDEV_NAME:
		case ISCSI_HOST_PARAM_HWADDRESS:
		case ISCSI_HOST_PARAM_IPADDRESS:
		case ISCSI_HOST_PARAM_INITIATOR_NAME:
			return S_IRUGO;
		default:
			return 0;
		}
2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604
	case ISCSI_PARAM:
		switch (param) {
		case ISCSI_PARAM_MAX_RECV_DLENGTH:
		case ISCSI_PARAM_MAX_XMIT_DLENGTH:
		case ISCSI_PARAM_HDRDGST_EN:
		case ISCSI_PARAM_DATADGST_EN:
		case ISCSI_PARAM_CONN_ADDRESS:
		case ISCSI_PARAM_CONN_PORT:
		case ISCSI_PARAM_EXP_STATSN:
		case ISCSI_PARAM_PERSISTENT_ADDRESS:
		case ISCSI_PARAM_PERSISTENT_PORT:
		case ISCSI_PARAM_PING_TMO:
		case ISCSI_PARAM_RECV_TMO:
2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624
		case ISCSI_PARAM_INITIAL_R2T_EN:
		case ISCSI_PARAM_MAX_R2T:
		case ISCSI_PARAM_IMM_DATA_EN:
		case ISCSI_PARAM_FIRST_BURST:
		case ISCSI_PARAM_MAX_BURST:
		case ISCSI_PARAM_PDU_INORDER_EN:
		case ISCSI_PARAM_DATASEQ_INORDER_EN:
		case ISCSI_PARAM_ERL:
		case ISCSI_PARAM_TARGET_NAME:
		case ISCSI_PARAM_TPGT:
		case ISCSI_PARAM_USERNAME:
		case ISCSI_PARAM_PASSWORD:
		case ISCSI_PARAM_USERNAME_IN:
		case ISCSI_PARAM_PASSWORD_IN:
		case ISCSI_PARAM_FAST_ABORT:
		case ISCSI_PARAM_ABORT_TMO:
		case ISCSI_PARAM_LU_RESET_TMO:
		case ISCSI_PARAM_TGT_RESET_TMO:
		case ISCSI_PARAM_IFACE_NAME:
		case ISCSI_PARAM_INITIATOR_NAME:
2625 2626 2627 2628 2629 2630 2631 2632 2633 2634
			return S_IRUGO;
		default:
			return 0;
		}
	}

	return 0;
}
EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);

2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655
static int __init libcxgbi_init_module(void)
{
	sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
	sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;

	pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
		ISCSI_ITT_MASK, sw_tag_idx_bits,
		ISCSI_AGE_MASK, sw_tag_age_bits);

	ddp_setup_host_page_size();
	return 0;
}

static void __exit libcxgbi_exit_module(void)
{
	cxgbi_device_unregister_all(0xFF);
	return;
}

module_init(libcxgbi_init_module);
module_exit(libcxgbi_exit_module);