Add support for the latest 1G/10G Chelsio adapter, T3.

This driver is required by the Chelsio T3 RDMA driver posted by
Steve Wise.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 1222 insertions, 0 deletions

diff --git a/drivers/net/cxgb3/cxgb3_offload.c b/drivers/net/cxgb3/cxgb3_offload.c
new file mode 100644
index 000000000000..3abd4d25c3b8
--- /dev/null
+++ b/drivers/net/cxgb3/cxgb3_offload.c
@@ -0,0 +1,1222 @@
+/*
+ * Copyright (c) 2006 Chelsio, Inc. All rights reserved.
+ * Copyright (c) 2006 Open Grid Computing, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/list.h>
+#include <net/neighbour.h>
+#include <linux/notifier.h>
+#include <asm/atomic.h>
+#include <linux/proc_fs.h>
+#include <linux/if_vlan.h>
+#include <net/netevent.h>
+#include <linux/highmem.h>
+#include <linux/vmalloc.h>
+
+#include "common.h"
+#include "regs.h"
+#include "cxgb3_ioctl.h"
+#include "cxgb3_ctl_defs.h"
+#include "cxgb3_defs.h"
+#include "l2t.h"
+#include "firmware_exports.h"
+#include "cxgb3_offload.h"
+
+static LIST_HEAD(client_list);
+static LIST_HEAD(ofld_dev_list);
+static DEFINE_MUTEX(cxgb3_db_lock);
+
+static DEFINE_RWLOCK(adapter_list_lock);
+static LIST_HEAD(adapter_list);
+
+static const unsigned int MAX_ATIDS = 64 * 1024;
+static const unsigned int ATID_BASE = 0x100000;
+
+static inline int offload_activated(struct t3cdev *tdev)
+{
+        const struct adapter *adapter = tdev2adap(tdev);
+
+        return (test_bit(OFFLOAD_DEVMAP_BIT, &adapter->open_device_map));
+}
+
+/**
+ *      cxgb3_register_client - register an offload client
+ *      @client: the client
+ *
+ *      Add the client to the client list,
+ *      and call backs the client for each activated offload device
+ */
+void cxgb3_register_client(struct cxgb3_client *client)
+{
+        struct t3cdev *tdev;
+
+        mutex_lock(&cxgb3_db_lock);
+        list_add_tail(&client->client_list, &client_list);
+
+        if (client->add) {
+                list_for_each_entry(tdev, &ofld_dev_list, ofld_dev_list) {
+                        if (offload_activated(tdev))
+                                client->add(tdev);
+                }
+        }
+        mutex_unlock(&cxgb3_db_lock);
+}
+
+EXPORT_SYMBOL(cxgb3_register_client);
+
+/**
+ *      cxgb3_unregister_client - unregister an offload client
+ *      @client: the client
+ *
+ *      Remove the client to the client list,
+ *      and call backs the client for each activated offload device.
+ */
+void cxgb3_unregister_client(struct cxgb3_client *client)
+{
+        struct t3cdev *tdev;
+
+        mutex_lock(&cxgb3_db_lock);
+        list_del(&client->client_list);
+
+        if (client->remove) {
+                list_for_each_entry(tdev, &ofld_dev_list, ofld_dev_list) {
+                        if (offload_activated(tdev))
+                                client->remove(tdev);
+                }
+        }
+        mutex_unlock(&cxgb3_db_lock);
+}
+
+EXPORT_SYMBOL(cxgb3_unregister_client);
+
+/**
+ *      cxgb3_add_clients - activate registered clients for an offload device
+ *      @tdev: the offload device
+ *
+ *      Call backs all registered clients once a offload device is activated
+ */
+void cxgb3_add_clients(struct t3cdev *tdev)
+{
+        struct cxgb3_client *client;
+
+        mutex_lock(&cxgb3_db_lock);
+        list_for_each_entry(client, &client_list, client_list) {
+                if (client->add)
+                        client->add(tdev);
+        }
+        mutex_unlock(&cxgb3_db_lock);
+}
+
+/**
+ *      cxgb3_remove_clients - deactivates registered clients
+ *                             for an offload device
+ *      @tdev: the offload device
+ *
+ *      Call backs all registered clients once a offload device is deactivated
+ */
+void cxgb3_remove_clients(struct t3cdev *tdev)
+{
+        struct cxgb3_client *client;
+
+        mutex_lock(&cxgb3_db_lock);
+        list_for_each_entry(client, &client_list, client_list) {
+                if (client->remove)
+                        client->remove(tdev);
+        }
+        mutex_unlock(&cxgb3_db_lock);
+}
+
+static struct net_device *get_iff_from_mac(struct adapter *adapter,
+                                           const unsigned char *mac,
+                                           unsigned int vlan)
+{
+        int i;
+
+        for_each_port(adapter, i) {
+                const struct vlan_group *grp;
+                struct net_device *dev = adapter->port[i];
+                const struct port_info *p = netdev_priv(dev);
+
+                if (!memcmp(dev->dev_addr, mac, ETH_ALEN)) {
+                        if (vlan && vlan != VLAN_VID_MASK) {
+                                grp = p->vlan_grp;
+                                dev = grp ? grp->vlan_devices[vlan] : NULL;
+                        } else
+                                while (dev->master)
+                                        dev = dev->master;
+                        return dev;
+                }
+        }
+        return NULL;
+}
+
+static int cxgb_ulp_iscsi_ctl(struct adapter *adapter, unsigned int req,
+                              void *data)
+{
+        int ret = 0;
+        struct ulp_iscsi_info *uiip = data;
+
+        switch (req) {
+        case ULP_ISCSI_GET_PARAMS:
+                uiip->pdev = adapter->pdev;
+                uiip->llimit = t3_read_reg(adapter, A_ULPRX_ISCSI_LLIMIT);
+                uiip->ulimit = t3_read_reg(adapter, A_ULPRX_ISCSI_ULIMIT);
+                uiip->tagmask = t3_read_reg(adapter, A_ULPRX_ISCSI_TAGMASK);
+                /*
+                 * On tx, the iscsi pdu has to be <= tx page size and has to
+                 * fit into the Tx PM FIFO.
+                 */
+                uiip->max_txsz = min(adapter->params.tp.tx_pg_size,
+                                     t3_read_reg(adapter, A_PM1_TX_CFG) >> 17);
+                /* on rx, the iscsi pdu has to be < rx page size and the
+                   whole pdu + cpl headers has to fit into one sge buffer */
+                uiip->max_rxsz = min_t(unsigned int,
+                                       adapter->params.tp.rx_pg_size,
+                                       (adapter->sge.qs[0].fl[1].buf_size -
+                                        sizeof(struct cpl_rx_data) * 2 -
+                                        sizeof(struct cpl_rx_data_ddp)));
+                break;
+        case ULP_ISCSI_SET_PARAMS:
+                t3_write_reg(adapter, A_ULPRX_ISCSI_TAGMASK, uiip->tagmask);
+                break;
+        default:
+                ret = -EOPNOTSUPP;
+        }
+        return ret;
+}
+
+/* Response queue used for RDMA events. */
+#define ASYNC_NOTIF_RSPQ 0
+
+static int cxgb_rdma_ctl(struct adapter *adapter, unsigned int req, void *data)
+{
+        int ret = 0;
+
+        switch (req) {
+        case RDMA_GET_PARAMS:{
+                struct rdma_info *req = data;
+                struct pci_dev *pdev = adapter->pdev;
+
+                req->udbell_physbase = pci_resource_start(pdev, 2);
+                req->udbell_len = pci_resource_len(pdev, 2);
+                req->tpt_base =
+                        t3_read_reg(adapter, A_ULPTX_TPT_LLIMIT);
+                req->tpt_top = t3_read_reg(adapter, A_ULPTX_TPT_ULIMIT);
+                req->pbl_base =
+                        t3_read_reg(adapter, A_ULPTX_PBL_LLIMIT);
+                req->pbl_top = t3_read_reg(adapter, A_ULPTX_PBL_ULIMIT);
+                req->rqt_base = t3_read_reg(adapter, A_ULPRX_RQ_LLIMIT);
+                req->rqt_top = t3_read_reg(adapter, A_ULPRX_RQ_ULIMIT);
+                req->kdb_addr = adapter->regs + A_SG_KDOORBELL;
+                req->pdev = pdev;
+                break;
+        }
+        case RDMA_CQ_OP:{
+                unsigned long flags;
+                struct rdma_cq_op *req = data;
+
+                /* may be called in any context */
+                spin_lock_irqsave(&adapter->sge.reg_lock, flags);
+                ret = t3_sge_cqcntxt_op(adapter, req->id, req->op,
+                                        req->credits);
+                spin_unlock_irqrestore(&adapter->sge.reg_lock, flags);
+                break;
+        }
+        case RDMA_GET_MEM:{
+                struct ch_mem_range *t = data;
+                struct mc7 *mem;
+
+                if ((t->addr & 7) || (t->len & 7))
+                        return -EINVAL;
+                if (t->mem_id == MEM_CM)
+                        mem = &adapter->cm;
+                else if (t->mem_id == MEM_PMRX)
+                        mem = &adapter->pmrx;
+                else if (t->mem_id == MEM_PMTX)
+                        mem = &adapter->pmtx;
+                else
+                        return -EINVAL;
+
+                ret =
+                        t3_mc7_bd_read(mem, t->addr / 8, t->len / 8,
+                                        (u64 *) t->buf);
+                if (ret)
+                        return ret;
+                break;
+        }
+        case RDMA_CQ_SETUP:{
+                struct rdma_cq_setup *req = data;
+
+                spin_lock_irq(&adapter->sge.reg_lock);
+                ret =
+                        t3_sge_init_cqcntxt(adapter, req->id,
+                                        req->base_addr, req->size,
+                                        ASYNC_NOTIF_RSPQ,
+                                        req->ovfl_mode, req->credits,
+                                        req->credit_thres);
+                spin_unlock_irq(&adapter->sge.reg_lock);
+                break;
+        }
+        case RDMA_CQ_DISABLE:
+                spin_lock_irq(&adapter->sge.reg_lock);
+                ret = t3_sge_disable_cqcntxt(adapter, *(unsigned int *)data);
+                spin_unlock_irq(&adapter->sge.reg_lock);
+                break;
+        case RDMA_CTRL_QP_SETUP:{
+                struct rdma_ctrlqp_setup *req = data;
+
+                spin_lock_irq(&adapter->sge.reg_lock);
+                ret = t3_sge_init_ecntxt(adapter, FW_RI_SGEEC_START, 0,
+                                                SGE_CNTXT_RDMA,
+                                                ASYNC_NOTIF_RSPQ,
+                                                req->base_addr, req->size,
+                                                FW_RI_TID_START, 1, 0);
+                spin_unlock_irq(&adapter->sge.reg_lock);
+                break;
+        }
+        default:
+                ret = -EOPNOTSUPP;
+        }
+        return ret;
+}
+
+static int cxgb_offload_ctl(struct t3cdev *tdev, unsigned int req, void *data)
+{
+        struct adapter *adapter = tdev2adap(tdev);
+        struct tid_range *tid;
+        struct mtutab *mtup;
+        struct iff_mac *iffmacp;
+        struct ddp_params *ddpp;
+        struct adap_ports *ports;
+        int i;
+
+        switch (req) {
+        case GET_MAX_OUTSTANDING_WR:
+                *(unsigned int *)data = FW_WR_NUM;
+                break;
+        case GET_WR_LEN:
+                *(unsigned int *)data = WR_FLITS;
+                break;
+        case GET_TX_MAX_CHUNK:
+                *(unsigned int *)data = 1 << 20;        /* 1MB */
+                break;
+        case GET_TID_RANGE:
+                tid = data;
+                tid->num = t3_mc5_size(&adapter->mc5) -
+                    adapter->params.mc5.nroutes -
+                    adapter->params.mc5.nfilters - adapter->params.mc5.nservers;
+                tid->base = 0;
+                break;
+        case GET_STID_RANGE:
+                tid = data;
+                tid->num = adapter->params.mc5.nservers;
+                tid->base = t3_mc5_size(&adapter->mc5) - tid->num -
+                    adapter->params.mc5.nfilters - adapter->params.mc5.nroutes;
+                break;
+        case GET_L2T_CAPACITY:
+                *(unsigned int *)data = 2048;
+                break;
+        case GET_MTUS:
+                mtup = data;
+                mtup->size = NMTUS;
+                mtup->mtus = adapter->params.mtus;
+                break;
+        case GET_IFF_FROM_MAC:
+                iffmacp = data;
+                iffmacp->dev = get_iff_from_mac(adapter, iffmacp->mac_addr,
+                                                iffmacp->vlan_tag &
+                                                VLAN_VID_MASK);
+                break;
+        case GET_DDP_PARAMS:
+                ddpp = data;
+                ddpp->llimit = t3_read_reg(adapter, A_ULPRX_TDDP_LLIMIT);
+                ddpp->ulimit = t3_read_reg(adapter, A_ULPRX_TDDP_ULIMIT);
+                ddpp->tag_mask = t3_read_reg(adapter, A_ULPRX_TDDP_TAGMASK);
+                break;
+        case GET_PORTS:
+                ports = data;
+                ports->nports = adapter->params.nports;
+                for_each_port(adapter, i)
+                        ports->lldevs[i] = adapter->port[i];
+                break;
+        case ULP_ISCSI_GET_PARAMS:
+        case ULP_ISCSI_SET_PARAMS:
+                if (!offload_running(adapter))
+                        return -EAGAIN;
+                return cxgb_ulp_iscsi_ctl(adapter, req, data);
+        case RDMA_GET_PARAMS:
+        case RDMA_CQ_OP:
+        case RDMA_CQ_SETUP:
+        case RDMA_CQ_DISABLE:
+        case RDMA_CTRL_QP_SETUP:
+        case RDMA_GET_MEM:
+                if (!offload_running(adapter))
+                        return -EAGAIN;
+                return cxgb_rdma_ctl(adapter, req, data);
+        default:
+                return -EOPNOTSUPP;
+        }
+        return 0;
+}
+
+/*
+ * Dummy handler for Rx offload packets in case we get an offload packet before
+ * proper processing is setup.  This complains and drops the packet as it isn't
+ * normal to get offload packets at this stage.
+ */
+static int rx_offload_blackhole(struct t3cdev *dev, struct sk_buff **skbs,
+                                int n)
+{
+        CH_ERR(tdev2adap(dev), "%d unexpected offload packets, first data %u\n",
+               n, ntohl(*(u32 *)skbs[0]->data));
+        while (n--)
+                dev_kfree_skb_any(skbs[n]);
+        return 0;
+}
+
+static void dummy_neigh_update(struct t3cdev *dev, struct neighbour *neigh)
+{
+}
+
+void cxgb3_set_dummy_ops(struct t3cdev *dev)
+{
+        dev->recv = rx_offload_blackhole;
+        dev->neigh_update = dummy_neigh_update;
+}
+
+/*
+ * Free an active-open TID.
+ */
+void *cxgb3_free_atid(struct t3cdev *tdev, int atid)
+{
+        struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
+        union active_open_entry *p = atid2entry(t, atid);
+        void *ctx = p->t3c_tid.ctx;
+
+        spin_lock_bh(&t->atid_lock);
+        p->next = t->afree;
+        t->afree = p;
+        t->atids_in_use--;
+        spin_unlock_bh(&t->atid_lock);
+
+        return ctx;
+}
+
+EXPORT_SYMBOL(cxgb3_free_atid);
+
+/*
+ * Free a server TID and return it to the free pool.
+ */
+void cxgb3_free_stid(struct t3cdev *tdev, int stid)
+{
+        struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
+        union listen_entry *p = stid2entry(t, stid);
+
+        spin_lock_bh(&t->stid_lock);
+        p->next = t->sfree;
+        t->sfree = p;
+        t->stids_in_use--;
+        spin_unlock_bh(&t->stid_lock);
+}
+
+EXPORT_SYMBOL(cxgb3_free_stid);
+
+void cxgb3_insert_tid(struct t3cdev *tdev, struct cxgb3_client *client,
+                      void *ctx, unsigned int tid)
+{
+        struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
+
+        t->tid_tab[tid].client = client;
+        t->tid_tab[tid].ctx = ctx;
+        atomic_inc(&t->tids_in_use);
+}
+
+EXPORT_SYMBOL(cxgb3_insert_tid);
+
+/*
+ * Populate a TID_RELEASE WR.  The skb must be already propely sized.
+ */
+static inline void mk_tid_release(struct sk_buff *skb, unsigned int tid)
+{
+        struct cpl_tid_release *req;
+
+        skb->priority = CPL_PRIORITY_SETUP;
+        req = (struct cpl_tid_release *)__skb_put(skb, sizeof(*req));
+        req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
+        OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_TID_RELEASE, tid));
+}
+
+static void t3_process_tid_release_list(struct work_struct *work)
+{
+        struct t3c_data *td = container_of(work, struct t3c_data,
+                                           tid_release_task);
+        struct sk_buff *skb;
+        struct t3cdev *tdev = td->dev;
+        
+
+        spin_lock_bh(&td->tid_release_lock);
+        while (td->tid_release_list) {
+                struct t3c_tid_entry *p = td->tid_release_list;
+
+                td->tid_release_list = (struct t3c_tid_entry *)p->ctx;
+                spin_unlock_bh(&td->tid_release_lock);
+
+                skb = alloc_skb(sizeof(struct cpl_tid_release),
+                                GFP_KERNEL | __GFP_NOFAIL);
+                mk_tid_release(skb, p - td->tid_maps.tid_tab);
+                cxgb3_ofld_send(tdev, skb);
+                p->ctx = NULL;
+                spin_lock_bh(&td->tid_release_lock);
+        }
+        spin_unlock_bh(&td->tid_release_lock);
+}
+
+/* use ctx as a next pointer in the tid release list */
+void cxgb3_queue_tid_release(struct t3cdev *tdev, unsigned int tid)
+{
+        struct t3c_data *td = T3C_DATA(tdev);
+        struct t3c_tid_entry *p = &td->tid_maps.tid_tab[tid];
+
+        spin_lock_bh(&td->tid_release_lock);
+        p->ctx = (void *)td->tid_release_list;
+        td->tid_release_list = p;
+        if (!p->ctx)
+                schedule_work(&td->tid_release_task);
+        spin_unlock_bh(&td->tid_release_lock);
+}
+
+EXPORT_SYMBOL(cxgb3_queue_tid_release);
+
+/*
+ * Remove a tid from the TID table.  A client may defer processing its last
+ * CPL message if it is locked at the time it arrives, and while the message
+ * sits in the client's backlog the TID may be reused for another connection.
+ * To handle this we atomically switch the TID association if it still points
+ * to the original client context.
+ */
+void cxgb3_remove_tid(struct t3cdev *tdev, void *ctx, unsigned int tid)
+{
+        struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
+
+        BUG_ON(tid >= t->ntids);
+        if (tdev->type == T3A)
+                (void)cmpxchg(&t->tid_tab[tid].ctx, ctx, NULL);
+        else {
+                struct sk_buff *skb;
+
+                skb = alloc_skb(sizeof(struct cpl_tid_release), GFP_ATOMIC);
+                if (likely(skb)) {
+                        mk_tid_release(skb, tid);
+                        cxgb3_ofld_send(tdev, skb);
+                        t->tid_tab[tid].ctx = NULL;
+                } else
+                        cxgb3_queue_tid_release(tdev, tid);
+        }
+        atomic_dec(&t->tids_in_use);
+}
+
+EXPORT_SYMBOL(cxgb3_remove_tid);
+
+int cxgb3_alloc_atid(struct t3cdev *tdev, struct cxgb3_client *client,
+                     void *ctx)
+{
+        int atid = -1;
+        struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
+
+        spin_lock_bh(&t->atid_lock);
+        if (t->afree) {
+                union active_open_entry *p = t->afree;
+
+                atid = (p - t->atid_tab) + t->atid_base;
+                t->afree = p->next;
+                p->t3c_tid.ctx = ctx;
+                p->t3c_tid.client = client;
+                t->atids_in_use++;
+        }
+        spin_unlock_bh(&t->atid_lock);
+        return atid;
+}
+
+EXPORT_SYMBOL(cxgb3_alloc_atid);
+
+int cxgb3_alloc_stid(struct t3cdev *tdev, struct cxgb3_client *client,
+                     void *ctx)
+{
+        int stid = -1;
+        struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
+
+        spin_lock_bh(&t->stid_lock);
+        if (t->sfree) {
+                union listen_entry *p = t->sfree;
+
+                stid = (p - t->stid_tab) + t->stid_base;
+                t->sfree = p->next;
+                p->t3c_tid.ctx = ctx;
+                p->t3c_tid.client = client;
+                t->stids_in_use++;
+        }
+        spin_unlock_bh(&t->stid_lock);
+        return stid;
+}
+
+EXPORT_SYMBOL(cxgb3_alloc_stid);
+
+static int do_smt_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
+{
+        struct cpl_smt_write_rpl *rpl = cplhdr(skb);
+
+        if (rpl->status != CPL_ERR_NONE)
+                printk(KERN_ERR
+                       "Unexpected SMT_WRITE_RPL status %u for entry %u\n",
+                       rpl->status, GET_TID(rpl));
+
+        return CPL_RET_BUF_DONE;
+}
+
+static int do_l2t_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
+{
+        struct cpl_l2t_write_rpl *rpl = cplhdr(skb);
+
+        if (rpl->status != CPL_ERR_NONE)
+                printk(KERN_ERR
+                       "Unexpected L2T_WRITE_RPL status %u for entry %u\n",
+                       rpl->status, GET_TID(rpl));
+
+        return CPL_RET_BUF_DONE;
+}
+
+static int do_act_open_rpl(struct t3cdev *dev, struct sk_buff *skb)
+{
+        struct cpl_act_open_rpl *rpl = cplhdr(skb);
+        unsigned int atid = G_TID(ntohl(rpl->atid));
+        struct t3c_tid_entry *t3c_tid;
+
+        t3c_tid = lookup_atid(&(T3C_DATA(dev))->tid_maps, atid);
+        if (t3c_tid->ctx && t3c_tid->client && t3c_tid->client->handlers &&
+            t3c_tid->client->handlers[CPL_ACT_OPEN_RPL]) {
+                return t3c_tid->client->handlers[CPL_ACT_OPEN_RPL] (dev, skb,
+                                                                    t3c_tid->
+                                                                    ctx);
+        } else {
+                printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
+                       dev->name, CPL_ACT_OPEN_RPL);
+                return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
+        }
+}
+
+static int do_stid_rpl(struct t3cdev *dev, struct sk_buff *skb)
+{
+        union opcode_tid *p = cplhdr(skb);
+        unsigned int stid = G_TID(ntohl(p->opcode_tid));
+        struct t3c_tid_entry *t3c_tid;
+
+        t3c_tid = lookup_stid(&(T3C_DATA(dev))->tid_maps, stid);
+        if (t3c_tid->ctx && t3c_tid->client->handlers &&
+            t3c_tid->client->handlers[p->opcode]) {
+                return t3c_tid->client->handlers[p->opcode] (dev, skb,
+                                                             t3c_tid->ctx);
+        } else {
+                printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
+                       dev->name, p->opcode);
+                return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
+        }
+}
+
+static int do_hwtid_rpl(struct t3cdev *dev, struct sk_buff *skb)
+{
+        union opcode_tid *p = cplhdr(skb);
+        unsigned int hwtid = G_TID(ntohl(p->opcode_tid));
+        struct t3c_tid_entry *t3c_tid;
+
+        t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
+        if (t3c_tid->ctx && t3c_tid->client->handlers &&
+            t3c_tid->client->handlers[p->opcode]) {
+                return t3c_tid->client->handlers[p->opcode]
+                    (dev, skb, t3c_tid->ctx);
+        } else {
+                printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
+                       dev->name, p->opcode);
+                return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
+        }
+}
+
+static int do_cr(struct t3cdev *dev, struct sk_buff *skb)
+{
+        struct cpl_pass_accept_req *req = cplhdr(skb);
+        unsigned int stid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
+        struct t3c_tid_entry *t3c_tid;
+
+        t3c_tid = lookup_stid(&(T3C_DATA(dev))->tid_maps, stid);
+        if (t3c_tid->ctx && t3c_tid->client->handlers &&
+            t3c_tid->client->handlers[CPL_PASS_ACCEPT_REQ]) {
+                return t3c_tid->client->handlers[CPL_PASS_ACCEPT_REQ]
+                    (dev, skb, t3c_tid->ctx);
+        } else {
+                printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
+                       dev->name, CPL_PASS_ACCEPT_REQ);
+                return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
+        }
+}
+
+static int do_abort_req_rss(struct t3cdev *dev, struct sk_buff *skb)
+{
+        union opcode_tid *p = cplhdr(skb);
+        unsigned int hwtid = G_TID(ntohl(p->opcode_tid));
+        struct t3c_tid_entry *t3c_tid;
+
+        t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
+        if (t3c_tid->ctx && t3c_tid->client->handlers &&
+            t3c_tid->client->handlers[p->opcode]) {
+                return t3c_tid->client->handlers[p->opcode]
+                    (dev, skb, t3c_tid->ctx);
+        } else {
+                struct cpl_abort_req_rss *req = cplhdr(skb);
+                struct cpl_abort_rpl *rpl;
+
+                struct sk_buff *skb =
+                    alloc_skb(sizeof(struct cpl_abort_rpl), GFP_ATOMIC);
+                if (!skb) {
+                        printk("do_abort_req_rss: couldn't get skb!\n");
+                        goto out;
+                }
+                skb->priority = CPL_PRIORITY_DATA;
+                __skb_put(skb, sizeof(struct cpl_abort_rpl));
+                rpl = cplhdr(skb);
+                rpl->wr.wr_hi =
+                    htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
+                rpl->wr.wr_lo = htonl(V_WR_TID(GET_TID(req)));
+                OPCODE_TID(rpl) =
+                    htonl(MK_OPCODE_TID(CPL_ABORT_RPL, GET_TID(req)));
+                rpl->cmd = req->status;
+                cxgb3_ofld_send(dev, skb);
+out:
+                return CPL_RET_BUF_DONE;
+        }
+}
+
+static int do_act_establish(struct t3cdev *dev, struct sk_buff *skb)
+{
+        struct cpl_act_establish *req = cplhdr(skb);
+        unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
+        struct t3c_tid_entry *t3c_tid;
+
+        t3c_tid = lookup_atid(&(T3C_DATA(dev))->tid_maps, atid);
+        if (t3c_tid->ctx && t3c_tid->client->handlers &&
+            t3c_tid->client->handlers[CPL_ACT_ESTABLISH]) {
+                return t3c_tid->client->handlers[CPL_ACT_ESTABLISH]
+                    (dev, skb, t3c_tid->ctx);
+        } else {
+                printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
+                       dev->name, CPL_PASS_ACCEPT_REQ);
+                return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
+        }
+}
+
+static int do_set_tcb_rpl(struct t3cdev *dev, struct sk_buff *skb)
+{
+        struct cpl_set_tcb_rpl *rpl = cplhdr(skb);
+
+        if (rpl->status != CPL_ERR_NONE)
+                printk(KERN_ERR
+                       "Unexpected SET_TCB_RPL status %u for tid %u\n",
+                       rpl->status, GET_TID(rpl));
+        return CPL_RET_BUF_DONE;
+}
+
+static int do_trace(struct t3cdev *dev, struct sk_buff *skb)
+{
+        struct cpl_trace_pkt *p = cplhdr(skb);
+
+        skb->protocol = 0xffff;
+        skb->dev = dev->lldev;
+        skb_pull(skb, sizeof(*p));
+        skb->mac.raw = skb->data;
+        netif_receive_skb(skb);
+        return 0;
+}
+
+static int do_term(struct t3cdev *dev, struct sk_buff *skb)
+{
+        unsigned int hwtid = ntohl(skb->priority) >> 8 & 0xfffff;
+        unsigned int opcode = G_OPCODE(ntohl(skb->csum));
+        struct t3c_tid_entry *t3c_tid;
+
+        t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
+        if (t3c_tid->ctx && t3c_tid->client->handlers &&
+            t3c_tid->client->handlers[opcode]) {
+                return t3c_tid->client->handlers[opcode] (dev, skb,
+                                                          t3c_tid->ctx);
+        } else {
+                printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
+                       dev->name, opcode);
+                return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
+        }
+}
+
+static int nb_callback(struct notifier_block *self, unsigned long event,
+                       void *ctx)
+{
+        switch (event) {
+        case (NETEVENT_NEIGH_UPDATE):{
+                cxgb_neigh_update((struct neighbour *)ctx);
+                break;
+        }
+        case (NETEVENT_PMTU_UPDATE):
+                break;
+        case (NETEVENT_REDIRECT):{
+                struct netevent_redirect *nr = ctx;
+                cxgb_redirect(nr->old, nr->new);
+                cxgb_neigh_update(nr->new->neighbour);
+                break;
+        }
+        default:
+                break;
+        }
+        return 0;
+}
+
+static struct notifier_block nb = {
+        .notifier_call = nb_callback
+};
+
+/*
+ * Process a received packet with an unknown/unexpected CPL opcode.
+ */
+static int do_bad_cpl(struct t3cdev *dev, struct sk_buff *skb)
+{
+        printk(KERN_ERR "%s: received bad CPL command 0x%x\n", dev->name,
+               *skb->data);
+        return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
+}
+
+/*
+ * Handlers for each CPL opcode
+ */
+static cpl_handler_func cpl_handlers[NUM_CPL_CMDS];
+
+/*
+ * Add a new handler to the CPL dispatch table.  A NULL handler may be supplied
+ * to unregister an existing handler.
+ */
+void t3_register_cpl_handler(unsigned int opcode, cpl_handler_func h)
+{
+        if (opcode < NUM_CPL_CMDS)
+                cpl_handlers[opcode] = h ? h : do_bad_cpl;
+        else
+                printk(KERN_ERR "T3C: handler registration for "
+                       "opcode %x failed\n", opcode);
+}
+
+EXPORT_SYMBOL(t3_register_cpl_handler);
+
+/*
+ * T3CDEV's receive method.
+ */
+int process_rx(struct t3cdev *dev, struct sk_buff **skbs, int n)
+{
+        while (n--) {
+                struct sk_buff *skb = *skbs++;
+                unsigned int opcode = G_OPCODE(ntohl(skb->csum));
+                int ret = cpl_handlers[opcode] (dev, skb);
+
+#if VALIDATE_TID
+                if (ret & CPL_RET_UNKNOWN_TID) {
+                        union opcode_tid *p = cplhdr(skb);
+
+                        printk(KERN_ERR "%s: CPL message (opcode %u) had "
+                               "unknown TID %u\n", dev->name, opcode,
+                               G_TID(ntohl(p->opcode_tid)));
+                }
+#endif
+                if (ret & CPL_RET_BUF_DONE)
+                        kfree_skb(skb);
+        }
+        return 0;
+}
+
+/*
+ * Sends an sk_buff to a T3C driver after dealing with any active network taps.
+ */
+int cxgb3_ofld_send(struct t3cdev *dev, struct sk_buff *skb)
+{
+        int r;
+
+        local_bh_disable();
+        r = dev->send(dev, skb);
+        local_bh_enable();
+        return r;
+}
+
+EXPORT_SYMBOL(cxgb3_ofld_send);
+
+static int is_offloading(struct net_device *dev)
+{
+        struct adapter *adapter;
+        int i;
+
+        read_lock_bh(&adapter_list_lock);
+        list_for_each_entry(adapter, &adapter_list, adapter_list) {
+                for_each_port(adapter, i) {
+                        if (dev == adapter->port[i]) {
+                                read_unlock_bh(&adapter_list_lock);
+                                return 1;
+                        }
+                }
+        }
+        read_unlock_bh(&adapter_list_lock);
+        return 0;
+}
+
+void cxgb_neigh_update(struct neighbour *neigh)
+{
+        struct net_device *dev = neigh->dev;
+
+        if (dev && (is_offloading(dev))) {
+                struct t3cdev *tdev = T3CDEV(dev);
+
+                BUG_ON(!tdev);
+                t3_l2t_update(tdev, neigh);
+        }
+}
+
+static void set_l2t_ix(struct t3cdev *tdev, u32 tid, struct l2t_entry *e)
+{
+        struct sk_buff *skb;
+        struct cpl_set_tcb_field *req;
+
+        skb = alloc_skb(sizeof(*req), GFP_ATOMIC);
+        if (!skb) {
+                printk(KERN_ERR "%s: cannot allocate skb!\n", __FUNCTION__);
+                return;
+        }
+        skb->priority = CPL_PRIORITY_CONTROL;
+        req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
+        req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
+        OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
+        req->reply = 0;
+        req->cpu_idx = 0;
+        req->word = htons(W_TCB_L2T_IX);
+        req->mask = cpu_to_be64(V_TCB_L2T_IX(M_TCB_L2T_IX));
+        req->val = cpu_to_be64(V_TCB_L2T_IX(e->idx));
+        tdev->send(tdev, skb);
+}
+
+void cxgb_redirect(struct dst_entry *old, struct dst_entry *new)
+{
+        struct net_device *olddev, *newdev;
+        struct tid_info *ti;
+        struct t3cdev *tdev;
+        u32 tid;
+        int update_tcb;
+        struct l2t_entry *e;
+        struct t3c_tid_entry *te;
+
+        olddev = old->neighbour->dev;
+        newdev = new->neighbour->dev;
+        if (!is_offloading(olddev))
+                return;
+        if (!is_offloading(newdev)) {
+                printk(KERN_WARNING "%s: Redirect to non-offload"
+                       "device ignored.\n", __FUNCTION__);
+                return;
+        }
+        tdev = T3CDEV(olddev);
+        BUG_ON(!tdev);
+        if (tdev != T3CDEV(newdev)) {
+                printk(KERN_WARNING "%s: Redirect to different "
+                       "offload device ignored.\n", __FUNCTION__);
+                return;
+        }
+
+        /* Add new L2T entry */
+        e = t3_l2t_get(tdev, new->neighbour, newdev);
+        if (!e) {
+                printk(KERN_ERR "%s: couldn't allocate new l2t entry!\n",
+                       __FUNCTION__);
+                return;
+        }
+
+        /* Walk tid table and notify clients of dst change. */
+        ti = &(T3C_DATA(tdev))->tid_maps;
+        for (tid = 0; tid < ti->ntids; tid++) {
+                te = lookup_tid(ti, tid);
+                BUG_ON(!te);
+                if (te->ctx && te->client && te->client->redirect) {
+                        update_tcb = te->client->redirect(te->ctx, old, new, e);
+                        if (update_tcb) {
+                                l2t_hold(L2DATA(tdev), e);
+                                set_l2t_ix(tdev, tid, e);
+                        }
+                }
+        }
+        l2t_release(L2DATA(tdev), e);
+}
+
+/*
+ * Allocate a chunk of memory using kmalloc or, if that fails, vmalloc.
+ * The allocated memory is cleared.
+ */
+void *cxgb_alloc_mem(unsigned long size)
+{
+        void *p = kmalloc(size, GFP_KERNEL);
+
+        if (!p)
+                p = vmalloc(size);
+        if (p)
+                memset(p, 0, size);
+        return p;
+}
+
+/*
+ * Free memory allocated through t3_alloc_mem().
+ */
+void cxgb_free_mem(void *addr)
+{
+        unsigned long p = (unsigned long)addr;
+
+        if (p >= VMALLOC_START && p < VMALLOC_END)
+                vfree(addr);
+        else
+                kfree(addr);
+}
+
+/*
+ * Allocate and initialize the TID tables.  Returns 0 on success.
+ */
+static int init_tid_tabs(struct tid_info *t, unsigned int ntids,
+                         unsigned int natids, unsigned int nstids,
+                         unsigned int atid_base, unsigned int stid_base)
+{
+        unsigned long size = ntids * sizeof(*t->tid_tab) +
+            natids * sizeof(*t->atid_tab) + nstids * sizeof(*t->stid_tab);
+
+        t->tid_tab = cxgb_alloc_mem(size);
+        if (!t->tid_tab)
+                return -ENOMEM;
+
+        t->stid_tab = (union listen_entry *)&t->tid_tab[ntids];
+        t->atid_tab = (union active_open_entry *)&t->stid_tab[nstids];
+        t->ntids = ntids;
+        t->nstids = nstids;
+        t->stid_base = stid_base;
+        t->sfree = NULL;
+        t->natids = natids;
+        t->atid_base = atid_base;
+        t->afree = NULL;
+        t->stids_in_use = t->atids_in_use = 0;
+        atomic_set(&t->tids_in_use, 0);
+        spin_lock_init(&t->stid_lock);
+        spin_lock_init(&t->atid_lock);
+
+        /*
+         * Setup the free lists for stid_tab and atid_tab.
+         */
+        if (nstids) {
+                while (--nstids)
+                        t->stid_tab[nstids - 1].next = &t->stid_tab[nstids];
+                t->sfree = t->stid_tab;
+        }
+        if (natids) {
+                while (--natids)
+                        t->atid_tab[natids - 1].next = &t->atid_tab[natids];
+                t->afree = t->atid_tab;
+        }
+        return 0;
+}
+
+static void free_tid_maps(struct tid_info *t)
+{
+        cxgb_free_mem(t->tid_tab);
+}
+
+static inline void add_adapter(struct adapter *adap)
+{
+        write_lock_bh(&adapter_list_lock);
+        list_add_tail(&adap->adapter_list, &adapter_list);
+        write_unlock_bh(&adapter_list_lock);
+}
+
+static inline void remove_adapter(struct adapter *adap)
+{
+        write_lock_bh(&adapter_list_lock);
+        list_del(&adap->adapter_list);
+        write_unlock_bh(&adapter_list_lock);
+}
+
+int cxgb3_offload_activate(struct adapter *adapter)
+{
+        struct t3cdev *dev = &adapter->tdev;
+        int natids, err;
+        struct t3c_data *t;
+        struct tid_range stid_range, tid_range;
+        struct mtutab mtutab;
+        unsigned int l2t_capacity;
+
+        t = kcalloc(1, sizeof(*t), GFP_KERNEL);
+        if (!t)
+                return -ENOMEM;
+
+        err = -EOPNOTSUPP;
+        if (dev->ctl(dev, GET_TX_MAX_CHUNK, &t->tx_max_chunk) < 0 ||
+            dev->ctl(dev, GET_MAX_OUTSTANDING_WR, &t->max_wrs) < 0 ||
+            dev->ctl(dev, GET_L2T_CAPACITY, &l2t_capacity) < 0 ||
+            dev->ctl(dev, GET_MTUS, &mtutab) < 0 ||
+            dev->ctl(dev, GET_TID_RANGE, &tid_range) < 0 ||
+            dev->ctl(dev, GET_STID_RANGE, &stid_range) < 0)
+                goto out_free;
+
+        err = -ENOMEM;
+        L2DATA(dev) = t3_init_l2t(l2t_capacity);
+        if (!L2DATA(dev))
+                goto out_free;
+
+        natids = min(tid_range.num / 2, MAX_ATIDS);
+        err = init_tid_tabs(&t->tid_maps, tid_range.num, natids,
+                            stid_range.num, ATID_BASE, stid_range.base);
+        if (err)
+                goto out_free_l2t;
+
+        t->mtus = mtutab.mtus;
+        t->nmtus = mtutab.size;
+
+        INIT_WORK(&t->tid_release_task, t3_process_tid_release_list);
+        spin_lock_init(&t->tid_release_lock);
+        INIT_LIST_HEAD(&t->list_node);
+        t->dev = dev;
+
+        T3C_DATA(dev) = t;
+        dev->recv = process_rx;
+        dev->neigh_update = t3_l2t_update;
+
+        /* Register netevent handler once */
+        if (list_empty(&adapter_list))
+                register_netevent_notifier(&nb);
+
+        add_adapter(adapter);
+        return 0;
+
+out_free_l2t:
+        t3_free_l2t(L2DATA(dev));
+        L2DATA(dev) = NULL;
+out_free:
+        kfree(t);
+        return err;
+}
+
+void cxgb3_offload_deactivate(struct adapter *adapter)
+{
+        struct t3cdev *tdev = &adapter->tdev;
+        struct t3c_data *t = T3C_DATA(tdev);
+
+        remove_adapter(adapter);
+        if (list_empty(&adapter_list))
+                unregister_netevent_notifier(&nb);
+
+        free_tid_maps(&t->tid_maps);
+        T3C_DATA(tdev) = NULL;
+        t3_free_l2t(L2DATA(tdev));
+        L2DATA(tdev) = NULL;
+        kfree(t);
+}
+
+static inline void register_tdev(struct t3cdev *tdev)
+{
+        static int unit;
+
+        mutex_lock(&cxgb3_db_lock);
+        snprintf(tdev->name, sizeof(tdev->name), "ofld_dev%d", unit++);
+        list_add_tail(&tdev->ofld_dev_list, &ofld_dev_list);
+        mutex_unlock(&cxgb3_db_lock);
+}
+
+static inline void unregister_tdev(struct t3cdev *tdev)
+{
+        mutex_lock(&cxgb3_db_lock);
+        list_del(&tdev->ofld_dev_list);
+        mutex_unlock(&cxgb3_db_lock);
+}
+
+void __devinit cxgb3_adapter_ofld(struct adapter *adapter)
+{
+        struct t3cdev *tdev = &adapter->tdev;
+
+        INIT_LIST_HEAD(&tdev->ofld_dev_list);
+
+        cxgb3_set_dummy_ops(tdev);
+        tdev->send = t3_offload_tx;
+        tdev->ctl = cxgb_offload_ctl;
+        tdev->type = adapter->params.rev == 0 ? T3A : T3B;
+
+        register_tdev(tdev);
+}
+
+void __devexit cxgb3_adapter_unofld(struct adapter *adapter)
+{
+        struct t3cdev *tdev = &adapter->tdev;
+
+        tdev->recv = NULL;
+        tdev->neigh_update = NULL;
+
+        unregister_tdev(tdev);
+}
+
+void __init cxgb3_offload_init(void)
+{
+        int i;
+
+        for (i = 0; i < NUM_CPL_CMDS; ++i)
+                cpl_handlers[i] = do_bad_cpl;
+
+        t3_register_cpl_handler(CPL_SMT_WRITE_RPL, do_smt_write_rpl);
+        t3_register_cpl_handler(CPL_L2T_WRITE_RPL, do_l2t_write_rpl);
+        t3_register_cpl_handler(CPL_PASS_OPEN_RPL, do_stid_rpl);
+        t3_register_cpl_handler(CPL_CLOSE_LISTSRV_RPL, do_stid_rpl);
+        t3_register_cpl_handler(CPL_PASS_ACCEPT_REQ, do_cr);
+        t3_register_cpl_handler(CPL_PASS_ESTABLISH, do_hwtid_rpl);
+        t3_register_cpl_handler(CPL_ABORT_RPL_RSS, do_hwtid_rpl);
+        t3_register_cpl_handler(CPL_ABORT_RPL, do_hwtid_rpl);
+        t3_register_cpl_handler(CPL_RX_URG_NOTIFY, do_hwtid_rpl);
+        t3_register_cpl_handler(CPL_RX_DATA, do_hwtid_rpl);
+        t3_register_cpl_handler(CPL_TX_DATA_ACK, do_hwtid_rpl);
+        t3_register_cpl_handler(CPL_TX_DMA_ACK, do_hwtid_rpl);
+        t3_register_cpl_handler(CPL_ACT_OPEN_RPL, do_act_open_rpl);
+        t3_register_cpl_handler(CPL_PEER_CLOSE, do_hwtid_rpl);
+        t3_register_cpl_handler(CPL_CLOSE_CON_RPL, do_hwtid_rpl);
+        t3_register_cpl_handler(CPL_ABORT_REQ_RSS, do_abort_req_rss);
+        t3_register_cpl_handler(CPL_ACT_ESTABLISH, do_act_establish);
+        t3_register_cpl_handler(CPL_SET_TCB_RPL, do_set_tcb_rpl);
+        t3_register_cpl_handler(CPL_RDMA_TERMINATE, do_term);
+        t3_register_cpl_handler(CPL_RDMA_EC_STATUS, do_hwtid_rpl);
+        t3_register_cpl_handler(CPL_TRACE_PKT, do_trace);
+        t3_register_cpl_handler(CPL_RX_DATA_DDP, do_hwtid_rpl);
+        t3_register_cpl_handler(CPL_RX_DDP_COMPLETE, do_hwtid_rpl);
+        t3_register_cpl_handler(CPL_ISCSI_HDR, do_hwtid_rpl);
+}