cxgb3_offload.c

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/*
 * Copyright (c) 2006-2007 Chelsio, 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 = 0x10000;

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) {
		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 = NULL;
				if (grp)
					dev = vlan_group_get_device(grp, vlan);
			} 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 *rdma = data;
		struct pci_dev *pdev = adapter->pdev;

		rdma->udbell_physbase = pci_resource_start(pdev, 2);
		rdma->udbell_len = pci_resource_len(pdev, 2);
		rdma->tpt_base =
			t3_read_reg(adapter, A_ULPTX_TPT_LLIMIT);
		rdma->tpt_top = t3_read_reg(adapter, A_ULPTX_TPT_ULIMIT);
		rdma->pbl_base =
			t3_read_reg(adapter, A_ULPTX_PBL_LLIMIT);
		rdma->pbl_top = t3_read_reg(adapter, A_ULPTX_PBL_ULIMIT);
		rdma->rqt_base = t3_read_reg(adapter, A_ULPRX_RQ_LLIMIT);
		rdma->rqt_top = t3_read_reg(adapter, A_ULPRX_RQ_ULIMIT);
		rdma->kdb_addr = adapter->regs + A_SG_KDOORBELL;
		rdma->pdev = pdev;
		break;
	}
	case RDMA_CQ_OP:{
		unsigned long flags;
		struct rdma_cq_op *rdma = data;

		/* may be called in any context */
		spin_lock_irqsave(&adapter->sge.reg_lock, flags);
		ret = t3_sge_cqcntxt_op(adapter, rdma->id, rdma->op,
					rdma->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 *rdma = data;

		spin_lock_irq(&adapter->sge.reg_lock);
		ret =
			t3_sge_init_cqcntxt(adapter, rdma->id,
					rdma->base_addr, rdma->size,
					ASYNC_NOTIF_RSPQ,
					rdma->ovfl_mode, rdma->credits,
					rdma->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 *rdma = 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,
						rdma->base_addr, rdma->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;
	struct ofld_page_info *rx_page_info;
	struct tp_params *tp = &adapter->params.tp;
	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);
	case GET_RX_PAGE_INFO:
		rx_page_info = data;
		rx_page_info->page_size = tp->rx_pg_size;
		rx_page_info->num = tp->rx_num_pgs;
		break;
	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(*(__be32 *)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;