cxgb4_uld.h

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/*
 * This file is part of the Chelsio T4 Ethernet driver for Linux.
 *
 * Copyright (c) 2003-2010 Chelsio Communications, 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.
 */

#ifndef __CXGB4_OFLD_H
#define __CXGB4_OFLD_H

#include <linux/cache.h>
#include <linux/spinlock.h>
#include <linux/skbuff.h>
#include <linux/atomic.h>

/* CPL message priority levels */
enum {
    CPL_PRIORITY_DATA     = 0,  /* data messages */
    CPL_PRIORITY_SETUP    = 1,  /* connection setup messages */
    CPL_PRIORITY_TEARDOWN = 0,  /* connection teardown messages */
    CPL_PRIORITY_LISTEN   = 1,  /* listen start/stop messages */
    CPL_PRIORITY_ACK      = 1,  /* RX ACK messages */
    CPL_PRIORITY_CONTROL  = 1   /* control messages */
};

#define INIT_TP_WR(w, tid) do { \
    (w)->wr.wr_hi = htonl(FW_WR_OP(FW_TP_WR) | \
                  FW_WR_IMMDLEN(sizeof(*w) - sizeof(w->wr))); \
    (w)->wr.wr_mid = htonl(FW_WR_LEN16(DIV_ROUND_UP(sizeof(*w), 16)) | \
                   FW_WR_FLOWID(tid)); \
    (w)->wr.wr_lo = cpu_to_be64(0); \
} while (0)

#define INIT_TP_WR_CPL(w, cpl, tid) do { \
    INIT_TP_WR(w, tid); \
    OPCODE_TID(w) = htonl(MK_OPCODE_TID(cpl, tid)); \
} while (0)

#define INIT_ULPTX_WR(w, wrlen, atomic, tid) do { \
    (w)->wr.wr_hi = htonl(FW_WR_OP(FW_ULPTX_WR) | FW_WR_ATOMIC(atomic)); \
    (w)->wr.wr_mid = htonl(FW_WR_LEN16(DIV_ROUND_UP(wrlen, 16)) | \
                   FW_WR_FLOWID(tid)); \
    (w)->wr.wr_lo = cpu_to_be64(0); \
} while (0)

/* Special asynchronous notification message */
#define CXGB4_MSG_AN ((void *)1)

struct serv_entry {
    void *data;
};

union aopen_entry {
    void *data;
    union aopen_entry *next;
};

/*
 * Holds the size, base address, free list start, etc of the TID, server TID,
 * and active-open TID tables.  The tables themselves are allocated dynamically.
 */
struct tid_info {
    void **tid_tab;
    unsigned int ntids;

    struct serv_entry *stid_tab;
    unsigned long *stid_bmap;
    unsigned int nstids;
    unsigned int stid_base;

    union aopen_entry *atid_tab;
    unsigned int natids;

    unsigned int nftids;
    unsigned int ftid_base;
    unsigned int aftid_base;
    unsigned int aftid_end;
    /* Server filter region */
    unsigned int sftid_base;
    unsigned int nsftids;

    spinlock_t atid_lock ____cacheline_aligned_in_smp;
    union aopen_entry *afree;
    unsigned int atids_in_use;

    spinlock_t stid_lock;
    unsigned int stids_in_use;

    atomic_t tids_in_use;
};

static inline void *lookup_tid(const struct tid_info *t, unsigned int tid)
{
    return tid < t->ntids ? t->tid_tab[tid] : NULL;
}

static inline void *lookup_atid(const struct tid_info *t, unsigned int atid)
{
    return atid < t->natids ? t->atid_tab[atid].data : NULL;
}

static inline void *lookup_stid(const struct tid_info *t, unsigned int stid)
{
    stid -= t->stid_base;
    return stid < t->nstids ? t->stid_tab[stid].data : NULL;
}

static inline void cxgb4_insert_tid(struct tid_info *t, void *data,
                    unsigned int tid)
{
    t->tid_tab[tid] = data;
    atomic_inc(&t->tids_in_use);
}

int cxgb4_alloc_atid(struct tid_info *t, void *data);
int cxgb4_alloc_stid(struct tid_info *t, int family, void *data);
void cxgb4_free_atid(struct tid_info *t, unsigned int atid);
void cxgb4_free_stid(struct tid_info *t, unsigned int stid, int family);
void cxgb4_remove_tid(struct tid_info *t, unsigned int qid, unsigned int tid);

struct in6_addr;

int cxgb4_create_server(const struct net_device *dev, unsigned int stid,
            __be32 sip, __be16 sport, unsigned int queue);

static inline void set_wr_txq(struct sk_buff *skb, int prio, int queue)
{
    skb_set_queue_mapping(skb, (queue << 1) | prio);
}

enum cxgb4_uld {
    CXGB4_ULD_RDMA,
    CXGB4_ULD_ISCSI,
    CXGB4_ULD_MAX
};

enum cxgb4_state {
    CXGB4_STATE_UP,
    CXGB4_STATE_START_RECOVERY,
    CXGB4_STATE_DOWN,
    CXGB4_STATE_DETACH
};

enum cxgb4_control {
    CXGB4_CONTROL_DB_FULL,
    CXGB4_CONTROL_DB_EMPTY,
    CXGB4_CONTROL_DB_DROP,
};

struct pci_dev;
struct l2t_data;
struct net_device;
struct pkt_gl;
struct tp_tcp_stats;

struct cxgb4_range {
    unsigned int start;
    unsigned int size;
};

struct cxgb4_virt_res {                      /* virtualized HW resources */
    struct cxgb4_range ddp;
    struct cxgb4_range iscsi;
    struct cxgb4_range stag;
    struct cxgb4_range rq;
    struct cxgb4_range pbl;
    struct cxgb4_range qp;
    struct cxgb4_range cq;
    struct cxgb4_range ocq;
};

#define OCQ_WIN_OFFSET(pdev, vres) \
    (pci_resource_len((pdev), 2) - roundup_pow_of_two((vres)->ocq.size))

/*
 * Block of information the LLD provides to ULDs attaching to a device.
 */
struct cxgb4_lld_info {
    struct pci_dev *pdev;                /* associated PCI device */
    struct l2t_data *l2t;                /* L2 table */
    struct tid_info *tids;               /* TID table */
    struct net_device **ports;           /* device ports */
    const struct cxgb4_virt_res *vr;     /* assorted HW resources */
    const unsigned short *mtus;          /* MTU table */
    const unsigned short *rxq_ids;       /* the ULD's Rx queue ids */
    unsigned short nrxq;                 /* # of Rx queues */
    unsigned short ntxq;                 /* # of Tx queues */
    unsigned char nchan:4;               /* # of channels */
    unsigned char nports:4;              /* # of ports */
    unsigned char wr_cred;               /* WR 16-byte credits */
    unsigned char adapter_type;          /* type of adapter */
    unsigned char fw_api_ver;            /* FW API version */
    unsigned int fw_vers;                /* FW version */
    unsigned int iscsi_iolen;            /* iSCSI max I/O length */
    unsigned short udb_density;          /* # of user DB/page */
    unsigned short ucq_density;          /* # of user CQs/page */
    void __iomem *gts_reg;               /* address of GTS register */
    void __iomem *db_reg;                /* address of kernel doorbell */
    int dbfifo_int_thresh;           /* doorbell fifo int threshold */
};

struct cxgb4_uld_info {
    const char *name;
    void *(*add)(const struct cxgb4_lld_info *p);
    int (*rx_handler)(void *handle, const __be64 *rsp,
              const struct pkt_gl *gl);
    int (*state_change)(void *handle, enum cxgb4_state new_state);
    int (*control)(void *handle, enum cxgb4_control control, ...);
};

int cxgb4_register_uld(enum cxgb4_uld type, const struct cxgb4_uld_info *p);
int cxgb4_unregister_uld(enum cxgb4_uld type);
int cxgb4_ofld_send(struct net_device *dev, struct sk_buff *skb);
unsigned int cxgb4_dbfifo_count(const struct net_device *dev, int lpfifo);
unsigned int cxgb4_port_chan(const struct net_device *dev);
unsigned int cxgb4_port_viid(const struct net_device *dev);
unsigned int cxgb4_port_idx(const struct net_device *dev);
unsigned int cxgb4_best_mtu(const unsigned short *mtus, unsigned short mtu,
                unsigned int *idx);
void cxgb4_get_tcp_stats(struct pci_dev *pdev, struct tp_tcp_stats *v4,
             struct tp_tcp_stats *v6);
void cxgb4_iscsi_init(struct net_device *dev, unsigned int tag_mask,
              const unsigned int *pgsz_order);
struct sk_buff *cxgb4_pktgl_to_skb(const struct pkt_gl *gl,
                   unsigned int skb_len, unsigned int pull_len);
int cxgb4_sync_txq_pidx(struct net_device *dev, u16 qid, u16 pidx, u16 size);
int cxgb4_flush_eq_cache(struct net_device *dev);
#endif  /* !__CXGB4_OFLD_H */