/*
* linux/drivers/net/ehea/ehea_qmr.h
*
* eHEA ethernet device driver for IBM eServer System p
*
* (C) Copyright IBM Corp. 2006
*
* Authors:
* Christoph Raisch <raisch@de.ibm.com>
* Jan-Bernd Themann <themann@de.ibm.com>
* Thomas Klein <tklein@de.ibm.com>
*
*
* 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; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __EHEA_QMR_H__
#define __EHEA_QMR_H__
#include "ehea.h"
#include "ehea_hw.h"
/*
* page size of ehea hardware queues
*/
#define EHEA_PAGESHIFT 12
#define EHEA_PAGESIZE 4096UL
/* Some abbreviations used here:
*
* WQE - Work Queue Entry
* SWQE - Send Work Queue Entry
* RWQE - Receive Work Queue Entry
* CQE - Completion Queue Entry
* EQE - Event Queue Entry
* MR - Memory Region
*/
/* Use of WR_ID field for EHEA */
#define EHEA_WR_ID_COUNT EHEA_BMASK_IBM(0, 19)
#define EHEA_WR_ID_TYPE EHEA_BMASK_IBM(20, 23)
#define EHEA_SWQE2_TYPE 0x1
#define EHEA_SWQE3_TYPE 0x2
#define EHEA_RWQE2_TYPE 0x3
#define EHEA_RWQE3_TYPE 0x4
#define EHEA_WR_ID_INDEX EHEA_BMASK_IBM(24, 47)
#define EHEA_WR_ID_REFILL EHEA_BMASK_IBM(48, 63)
struct ehea_vsgentry {
u64 vaddr;
u32 l_key;
u32 len;
};
/* maximum number of sg entries allowed in a WQE */
#define EHEA_MAX_WQE_SG_ENTRIES 252
#define SWQE2_MAX_IMM (0xD0 - 0x30)
#define SWQE3_MAX_IMM 224
/* tx control flags for swqe */
#define EHEA_SWQE_CRC 0x8000
#define EHEA_SWQE_IP_CHECKSUM 0x4000
#define EHEA_SWQE_TCP_CHECKSUM 0x2000
#define EHEA_SWQE_TSO 0x1000
#define EHEA_SWQE_SIGNALLED_COMPLETION 0x0800
#define EHEA_SWQE_VLAN_INSERT 0x0400
#define EHEA_SWQE_IMM_DATA_PRESENT 0x0200
#define EHEA_SWQE_DESCRIPTORS_PRESENT 0x0100
#define EHEA_SWQE_WRAP_CTL_REC 0x0080
#define EHEA_SWQE_WRAP_CTL_FORCE 0x0040
#define EHEA_SWQE_BIND 0x0020
#define EHEA_SWQE_PURGE 0x0010
/* sizeof(struct ehea_swqe) less the union */
#define SWQE_HEADER_SIZE 32
struct ehea_swqe {
u64 wr_id;
u16 tx_control;
u16 vlan_tag;
u8 reserved1;
u8 ip_start;
u8 ip_end;
u8 immediate_data_length;
u8 tcp_offset;
u8 reserved2;
u16 tcp_end;
u8 wrap_tag;
u8 descriptors; /* number of valid descriptors in WQE */
u16 reserved3;
u16 reserved4;
u16 mss;
u32 reserved5;
union {
/* Send WQE Format 1 */
struct {
struct ehea_vsgentry sg_list[EHEA_MAX_WQE_SG_ENTRIES];
} no_immediate_data;
/* Send WQE Format 2 */
struct {
struct ehea_vsgentry sg_entry;
/* 0x30 */
u8 immediate_data[SWQE2_MAX_IMM];
/* 0xd0 */
struct ehea_vsgentry sg_list[EHEA_MAX_WQE_SG_ENTRIES-1];
} immdata_desc __attribute__ ((packed));
/* Send WQE Format 3 */
struct {
u8 immediate_data[SWQE3_MAX_IMM];
} immdata_nodesc;
} u;
};
struct ehea_rwqe {
u64 wr_id; /* work request ID */
u8 reserved1[5];
u8 data_segments;
u16 reserved2;
u64 reserved3;
u64 reserved4;
struct ehea_vsgentry sg_list[EHEA_MAX_WQE_SG_ENTRIES];
};
#define EHEA_CQE_VLAN_TAG_XTRACT 0x0400
#define EHEA_CQE_TYPE_RQ 0x60
#define EHEA_CQE_STAT_ERR_MASK 0x721F
#define EHEA_CQE_STAT_FAT_ERR_MASK 0x1F
#define EHEA_CQE_STAT_ERR_TCP 0x4000
struct ehea_cqe {
u64 wr_id; /* work request ID from WQE */
u8 type;
u8 valid;
u16 status;
u16 reserved1;
u16 num_bytes_transfered;
u16 vlan_tag;
u16 inet_checksum_value;
u8 reserved2;
u8 header_length;
u16 reserved3;
u16 page_offset;
u16 wqe_count;
u32 qp_token;
u32 timestamp;
u32 reserved4;
u64 reserved5[3];
};
#define EHEA_EQE_VALID EHEA_BMASK_IBM(0, 0)
#define EHEA_EQE_IS_CQE EHEA_BMASK_IBM(1, 1)
#define EHEA_EQE_IDENTIFIER EHEA_BMASK_IBM(2, 7)
#define EHEA_EQE_QP_CQ_NUMBER EHEA_BMASK_IBM(8, 31)
#define EHEA_EQE_QP_TOKEN EHEA_BMASK_IBM(32, 63)
#define EHEA_EQE_CQ_TOKEN EHEA_BMASK_IBM(32, 63)
#define EHEA_EQE_KEY EHEA_BMASK_IBM(32, 63)
#define EHEA_EQE_PORT_NUMBER EHEA_BMASK_IBM(56, 63)
#define EHEA_EQE_EQ_NUMBER EHEA_BMASK_IBM(48, 63)
#define EHEA_EQE_SM_ID EHEA_BMASK_IBM(48, 63)
#define EHEA_EQE_SM_MECH_NUMBER EHEA_BMASK_IBM(48, 55)
#define EHEA_EQE_SM_PORT_NUMBER EHEA_BMASK_IBM(56, 63)
struct ehea_eqe {
u64 entry;
};
static inline void *hw_qeit_calc(struct hw_queue *queue, u64 q_offset)
{
struct ehea_page *current_page;
if (q_offset >= queue->queue_length)
q_offset -= queue->queue_length;
current_page = (queue->queue_pages)[q_offset >> EHEA_PAGESHIFT];
return ¤t_page->entries[q_offset & (EHEA_PAGESIZE - 1)];
}
static inline void *hw_qeit_get(struct hw_queue *queue)
{
return hw_qeit_calc(queue, queue->current_q_offset);
}
static inline void hw_qeit_inc(struct hw_queue *queue)
{
queue->current_q_offset += queue->qe_size;
if (queue->current_q_offset >= queue->queue_length) {
queue->current_q_offset = 0;
/* toggle the valid flag */
queue->toggle_state = (~queue->toggle_state) & 1;
}
}
static inline void *hw_qeit_get_inc(struct hw_queue *queue)
{
void *retvalue = hw_qeit_get(queue);
hw_qeit_inc(queue);
return retvalue;
}
static inline void *hw_qeit_get_inc_valid(struct hw_queue *queue)
{
struct ehea_cqe *retvalue = hw_qeit_get(queue);
u8 valid = retvalue->valid;
void *pref;
if ((valid >> 7) == (queue->toggle_state & 1)) {
/* this is a good one */
hw_qeit_inc(queue);
pref = hw_qeit_calc(queue, queue->current_q_offset);
prefetch(pref);
prefetch(pref + 128);
} else
retvalue = NULL;
return retvalue;
}
static inline void *hw_qeit_get_valid(struct hw_queue *queue)
{
struct ehea_cqe *retvalue = hw_qeit_get(queue);
void *pref;
u8 valid;
pref = hw_qeit_calc(queue, queue->current_q_offset);
prefetch(pref);
prefetch(pref + 128);
prefetch(pref + 256);
valid = retvalue->valid;
if (!((valid >> 7) == (queue->toggle_state & 1)))
retvalue = NULL;
return retvalue;
}
static inline void *hw_qeit_reset(struct hw_queue *queue)
{
queue->current_q_offset = 0;
return hw_qeit_get(queue);
}
static inline void *hw_qeit_eq_get_inc(struct hw_queue *queue)
{
u64 last_entry_in_q = queue->queue_length - queue->qe_size;
void *retvalue;
retvalue = hw_qeit_get(queue);
queue->current_q_offset += queue->qe_size;
if (queue->current_q_offset > last_entry_in_q) {
queue->current_q_offset = 0;
queue->toggle_state = (~queue->toggle_state) & 1;
}
return retvalue;
}
static inline void *hw_eqit_eq_get_inc_valid(struct hw_queue *queue)
{
void *retvalue = hw_qeit_get(queue);
u32 qe = *(u8*)retvalue;
if ((qe >> 7) == (queue->toggle_state & 1))
hw_qeit_eq_get_inc(queue);
else
retvalue = NULL;
return retvalue;
}
static inline struct ehea_rwqe *ehea_get_next_rwqe(struct ehea_qp *qp,
int rq_nr)
{
struct hw_queue *queue;
if (rq_nr == 1)
queue = &qp->hw_rqueue1;
else if (rq_nr == 2)
queue = &qp->hw_rqueue2;
else
queue = &qp->hw_rqueue3;
return hw_qeit_get_inc(queue);
}
static inline struct ehea_swqe *ehea_get_swqe(struct ehea_qp *my_qp,
int *wqe_index)
{
struct hw_queue *queue = &my_qp->hw_squeue;
struct ehea_swqe *wqe_p;
*wqe_index = (queue->current_q_offset) >> (7 + EHEA_SG_SQ);
wqe_p = hw_qeit_get_inc(&my_qp->hw_squeue);
return wqe_p;
}
static inline void ehea_post_swqe(struct ehea_qp *my_qp, struct ehea_swqe *swqe)
{
iosync();
ehea_update_sqa(my_qp, 1);
}
static inline struct ehea_cqe *ehea_poll_rq1(struct ehea_qp *qp, int *wqe_index)
{
struct hw_queue *queue = &qp->hw_rqueue1;
*wqe_index = (queue->current_q_offset) >> (7 + EHEA_SG_RQ1);
return hw_qeit_get_valid(queue);
}
static inline void ehea_inc_rq1(struct ehea_qp *qp)
{
hw_qeit_inc(&qp->hw_rqueue1);
}
static inline struct ehea_cqe *ehea_poll_cq(struct ehea_cq *my_cq)
{
return hw_qeit_get_inc_valid(&my_cq->hw_queue);
}
#define EHEA_CQ_REGISTER_ORIG 0
#define EHEA_EQ_REGISTER_ORIG 0
enum ehea_eq_type {
EHEA_EQ = 0, /* event queue */
EHEA_NEQ /* notification event queue */
};
struct ehea_eq *ehea_create_eq(struct ehea_adapter *adapter,
enum ehea_eq_type type,
const u32 length, const u8 eqe_gen);
int ehea_destroy_eq(struct ehea_eq *eq);
struct ehea_eqe *ehea_poll_eq(struct ehea_eq *eq);
struct ehea_cq *ehea_create_cq(struct ehea_adapter *adapter, int cqe,
u64 eq_handle, u32 cq_token);
int ehea_destroy_cq(struct ehea_cq *cq);
struct ehea_qp *ehea_create_qp(struct ehea_adapter * adapter, u32 pd,
struct ehea_qp_init_attr *init_attr);
int ehea_destroy_qp(struct ehea_qp *qp);
int ehea_reg_mr_adapter(struct ehea_adapter *adapter);
#endif /* __EHEA_QMR_H__ */
