path: root/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.h

/*
 * This file is part of the Chelsio T4 Ethernet driver for Linux.
 *
 * Copyright (c) 2003-2016 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_ULD_H
#define __CXGB4_ULD_H

#include <linux/cache.h>
#include <linux/spinlock.h>
#include <linux/skbuff.h>
#include <linux/inetdevice.h>
#include <linux/atomic.h>
#include "cxgb4.h"

#define MAX_ULD_QSETS 16

/* 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_V(FW_TP_WR) | \
			      FW_WR_IMMDLEN_V(sizeof(*w) - sizeof(w->wr))); \
	(w)->wr.wr_mid = htonl(FW_WR_LEN16_V(DIV_ROUND_UP(sizeof(*w), 16)) | \
			       FW_WR_FLOWID_V(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_V(FW_ULPTX_WR) | \
			      FW_WR_ATOMIC_V(atomic)); \
	(w)->wr.wr_mid = htonl(FW_WR_LEN16_V(DIV_ROUND_UP(wrlen, 16)) | \
			       FW_WR_FLOWID_V(tid)); \
	(w)->wr.wr_lo = cpu_to_be64(0); \
} while (0)

/* Special asynchronous notification message */
#define CXGB4_MSG_AN ((void *)1)
#define TX_ULD(uld)(((uld) != CXGB4_ULD_CRYPTO) ? CXGB4_TX_OFLD :\
		      CXGB4_TX_CRYPTO)

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;
	unsigned int hash_base;

	union aopen_entry *atid_tab;
	unsigned int natids;
	unsigned int atid_base;

	struct filter_entry *ftid_tab;
	unsigned long *ftid_bmap;
	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;
	unsigned int v6_stids_in_use;
	unsigned int sftids_in_use;

	/* TIDs in the TCAM */
	atomic_t tids_in_use;
	/* TIDs in the HASH */
	atomic_t hash_tids_in_use;
	atomic_t conns_in_use;
	/* lock for setting/clearing filter bitmap */
	spinlock_t ftid_lock;
};

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)
{
	/* Is it a server filter TID? */
	if (t->nsftids && (stid >= t->sftid_base)) {
		stid -= t->sftid_base;
		stid += t->nstids;
	} else {
		stid -= t->stid_base;
	}

	return stid < (t->nstids + t->nsftids) ? t->stid_tab[stid].data : NULL;
}

static inline void cxgb4_insert_tid(struct tid_info *t, void *data,
				    unsigned int tid, unsigned short family)
{
	t->tid_tab[tid] = data;
	if (t->hash_base && (tid >= t->hash_base)) {
		if (family == AF_INET6)
			atomic_add(2, &t->hash_tids_in_use);
		else
			atomic_inc(&t->hash_tids_in_use);
	} else {
		if (family == AF_INET6)
			atomic_add(2, &t->tids_in_use);
		else
			atomic_inc(&t->tids_in_use);
	}
	atomic_inc(&t->conns_in_use);
}

int cxgb4_alloc_atid(struct tid_info *t, void *data);
int cxgb4_alloc_stid(struct tid_info *t, int family, void *data);
int cxgb4_alloc_sftid(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,
		      unsigned short family);
struct in6_addr;

int cxgb4_create_server(const struct net_device *dev, unsigned int stid,
			__be32 sip, __be16 sport, __be16 vlan,
			unsigned int queue);
int cxgb4_create_server6(const struct net_device *dev, unsigned int stid,
			 const struct in6_addr *sip, __be16 sport,
			 unsigned int queue);
int cxgb4_remove_server(const struct net_device *dev, unsigned int stid,
			unsigned int queue, bool ipv6);
int cxgb4_create_server_filter(const struct net_device *dev, unsigned int stid,
			       __be32 sip, __be16 sport, __be16 vlan,
			       unsigned int queue,
			       unsigned char port, unsigned char mask);
int cxgb4_remove_server_filter(const struct net_device *dev, unsigned int stid,
			       unsigned int queue, bool ipv6);

/* Filter operation context to allow callers of cxgb4_set_filter() and
 * cxgb4_del_filter() to wait for an asynchronous completion.
 */
struct filter_ctx {
	struct completion completion;	/* completion rendezvous */
	void *closure;			/* caller's opaque information */
	int result;			/* result of operation */
	u32 tid;			/* to store tid */
};

struct ch_filter_specification;

int cxgb4_get_free_ftid(struct net_device *dev, int family);
int __cxgb4_set_filter(struct net_device *dev, int filter_id,
		       struct ch_filter_specification *fs,
		       struct filter_ctx *ctx);
int __cxgb4_del_filter(struct net_device *dev, int filter_id,
		       struct ch_filter_specification *fs,
		       struct filter_ctx *ctx);
int cxgb4_set_filter(struct net_device *dev, int filter_id,
		     struct ch_filter_specification *fs);
int cxgb4_del_filter(struct net_device *dev, int filter_id,
		     struct ch_filter_specification *fs);
int cxgb4_get_filter_counters(struct net_device *dev, unsigned int fidx,
			      u64 *hitcnt, u64 *bytecnt, bool hash);

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_INIT,
	CXGB4_ULD_RDMA,
	CXGB4_ULD_ISCSI,
	CXGB4_ULD_ISCSIT,
	CXGB4_ULD_CRYPTO,
	CXGB4_ULD_TLS,
	CXGB4_ULD_MAX
};

enum cxgb4_tx_uld {
	CXGB4_TX_OFLD,
	CXGB4_TX_CRYPTO,
	CXGB4_TX_MAX
};

enum cxgb4_txq_type {
	CXGB4_TXQ_ETH,
	CXGB4_TXQ_ULD,
	CXGB4_TXQ_CTRL,
	CXGB4_TXQ_MAX
};

enum cxgb4_state {
	CXGB4_STATE_UP,
	CXGB4_STATE_START_RECOVERY,
	CXGB4_STATE_DOWN,
	CXGB4_STATE_DETACH,
	CXGB4_STATE_FATAL_ERROR
};

enum cxgb4_control {
	CXGB4_CONTROL_DB_FULL,
	CXGB4_CONTROL_DB_EMPTY,
	CXGB4_CONTROL_DB_DROP,
};

struct pci_dev;
struct l2t_data;
struct net_device