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linux-next/drivers/net/ehea/ehea_qmr.h
Jan-Bernd Themann 2c69448bbc ehea: DLPAR memory add fix 
Due to stability issues in high load situations the HW queue handling
has to be changed. The HW queues are now stopped and restarted again instead
of destroying and allocating new HW queues.

Signed-off-by: Jan-Bernd Themann <themann@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2007-10-10 16:54:05 -07:00

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/*
* 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 (1UL << EHEA_PAGESHIFT)
#define EHEA_SECTSIZE (1UL << 24)
#define EHEA_PAGES_PER_SECTION (EHEA_SECTSIZE >> EHEA_PAGESHIFT)
#if (1UL << SECTION_SIZE_BITS) < EHEA_SECTSIZE
#error eHEA module can't work if kernel sectionsize < ehea sectionsize
#endif
/* 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 0x720F
#define EHEA_CQE_STAT_FAT_ERR_MASK 0x1F
#define EHEA_CQE_STAT_ERR_TCP 0x4000
#define EHEA_CQE_STAT_ERR_IP 0x2000
#define EHEA_CQE_STAT_ERR_CRC 0x1000
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;
};
#define ERROR_DATA_LENGTH EHEA_BMASK_IBM(52,63)
#define ERROR_DATA_TYPE EHEA_BMASK_IBM(0,7)
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 &current_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_cq(struct ehea_cq *cq)
{
hw_qeit_inc(&cq->hw_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_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_kernel_mr(struct ehea_adapter *adapter, struct ehea_mr *mr);
int ehea_gen_smr(struct ehea_adapter *adapter, struct ehea_mr *old_mr,
struct ehea_mr *shared_mr);
int ehea_rem_mr(struct ehea_mr *mr);
void ehea_error_data(struct ehea_adapter *adapter, u64 res_handle);
int ehea_create_busmap( void );
void ehea_destroy_busmap( void );
u64 ehea_map_vaddr(void *caddr);
#endif /* __EHEA_QMR_H__ */
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