diff options
Diffstat (limited to 'drivers/scsi/cxgbi/libcxgbi.c')
| -rw-r--r-- | drivers/scsi/cxgbi/libcxgbi.c | 2612 |
1 files changed, 2612 insertions, 0 deletions
diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c new file mode 100644 index 00000000000..be5661707df --- /dev/null +++ b/drivers/scsi/cxgbi/libcxgbi.c @@ -0,0 +1,2612 @@ +/* + * 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 */ +#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) +{ + struct net_device *vdev = NULL; + struct cxgbi_device *cdev, *tmp; + int i; + + if (ndev->priv_flags & IFF_802_1Q_VLAN) { + vdev = ndev; + ndev = vlan_dev_real_dev(ndev); + log_debug(1 << CXGBI_DBG_DEV, + "vlan dev %s -> %s.\n", vdev->name, ndev->name); + } + + 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]) { + cdev->hbas[i]->vdev = vdev; + 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; +} + +static struct rtable *find_route_ipv4(__be32 saddr, __be32 daddr, + __be16 sport, __be16 dport, u8 tos) +{ + struct rtable *rt; + struct flowi fl = { + .oif = 0, + .nl_u = { + .ip4_u = { + .daddr = daddr, + .saddr = saddr, + .tos = tos } + }, + .proto = IPPROTO_TCP, + .uli_u = { + .ports = { + .sport = sport, + .dport = dport } + } + }; + + if (ip_route_output_flow(&init_net, &rt, &fl, NULL, 0)) + 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; + 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; + } + + rt = find_route_ipv4(0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0); + 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; + ndev = dst->neighbour->dev; + + 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", + dst->neighbour->dev->name, ndev->name, mtu); + } + + 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; + csk->saddr.sin_addr.s_addr = rt->rt_src; + + 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) { + read_lock_bh(&csk->callback_lock); + if (csk->user_data) + iscsi_conn_failure(csk->user_data, + ISCSI_ERR_CONN_FAILED); + read_unlock_bh(&csk->callback_lock); + } +} + +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; + + csk->advmss = dst_metric(dst, RTAX_ADVMSS); + + 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; + } + + if (cdev->csk_ddp_alloc_gl_skb) { + err = cdev->csk_ddp_alloc_gl_skb(ddp, idx, npods, gfp); + if (err < 0) + goto unmark_entries; + } + + 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); + if (err < 0) { + if (cdev->csk_ddp_free_gl_skb) + cdev->csk_ddp_free_gl_skb(ddp, idx, npods); + 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); + if (cdev->csk_ddp_free_gl_skb) + cdev->csk_ddp_free_gl_skb(ddp, i, npods); + 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); + ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) + + ppmax * sizeof(struct cxgbi_gather_list *)); + 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); + 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; + } + err = skb_read_pdu_data(conn, skb, skb, + err + cdev->skb_rx_extra); + 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)); + } else { + err = skb_read_pdu_bhs(conn, skb); + 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; + } + + if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) { + struct sk_buff *dskb; + + dskb = skb_peek(&csk->receive_queue); + if (!dskb) { + 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; + } + __skb_unlink(dskb, &csk->receive_queue); + + err = skb_read_pdu_data(conn, skb, dskb, 0); + 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); + __kfree_skb(dskb); + } else + err = skb_read_pdu_data(conn, skb, skb, 0); + } +skb_done: + __kfree_skb(skb); + + 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) { + pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n", + csk, conn, err, read); + 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, + unsigned int dlen, skb_frag_t *frags, + 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 == + frags[i - 1].page_offset + frags[i - 1].size) { + frags[i - 1].size += copy; + } else { + if (i >= frag_max) { + pr_warn("too many pages %u, dlen %u.\n", + frag_max, dlen); + return -EINVAL; + } + + frags[i].page = page; + frags[i].page_offset = sg->offset + sgoffset; + frags[i].size = copy; + 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; + struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); + 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) { + pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n", + cdev->skb_tx_rsvd, headroom, opcode); + 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) +{ + u8 submode = 0; + + if (hcrc) + submode |= 1; + if (dcrc) + submode |= 2; + cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode; +} + +int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset, + unsigned int count) +{ + struct iscsi_conn *conn = task->conn; + struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); + 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; + skb_frag_t *frag = tdata->frags; + + /* data fits in the skb's headroom */ + for (i = 0; i < tdata->nr_frags; i++, frag++) { + char *src = kmap_atomic(frag->page, + KM_SOFTIRQ0); + + memcpy(dst, src+frag->page_offset, frag->size); + dst += frag->size; + kunmap_atomic(src, KM_SOFTIRQ0); + } + if (padlen) { + memset(dst, 0, padlen); + padlen = 0; + } + skb_put(skb, count + padlen); + } else { + /* data fit into frag_list */ + for (i = 0; i < tdata->nr_frags; i++) + get_page(tdata->frags[i].page); + + memcpy(skb_shinfo(skb)->frags, tdata->frags, + sizeof(skb_frag_t) * tdata->nr_frags); + 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; + struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); + 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) +{ + struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); + + 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); + +int cxgbi_get_conn_param(struct iscsi_cls_conn *cls_conn, + enum iscsi_param param, char *buf) +{ + struct iscsi_conn *iconn = cls_conn->dd_data; + int len; + + log_debug(1 << CXGBI_DBG_ISCSI, + "cls_conn 0x%p, param %d.\n", cls_conn, param); + + switch (param) { + case ISCSI_PARAM_CONN_PORT: + spin_lock_bh(&iconn->session->lock); + len = sprintf(buf, "%hu\n", iconn->portal_port); + spin_unlock_bh(&iconn->session->lock); + break; + case ISCSI_PARAM_CONN_ADDRESS: + spin_lock_bh(&iconn->session->lock); + len = sprintf(buf, "%s\n", iconn->portal_address); + spin_unlock_bh(&iconn->session->lock); + break; + default: + return iscsi_conn_get_param(cls_conn, param, buf); + } + return len; +} +EXPORT_SYMBOL_GPL(cxgbi_get_conn_param); + +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; + + write_lock_bh(&csk->callback_lock); + csk->user_data = conn; + cconn->chba = cep->chba; + cconn->cep = cep; + cep->cconn = cconn; + write_unlock_bh(&csk->callback_lock); + + cxgbi_conn_max_xmit_dlength(conn); + cxgbi_conn_max_recv_dlength(conn); + + spin_lock_bh(&conn->session->lock); + sprintf(conn->portal_address, "%pI4", &csk->daddr.sin_addr.s_addr); + conn->portal_port = ntohs(csk->daddr.sin_port); + spin_unlock_bh(&conn->session->lock); + + 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); + +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); |