335 lines
9.5 KiB
C
335 lines
9.5 KiB
C
/*
|
|
* libcxgb_ppm.h: Chelsio common library for T3/T4/T5 iSCSI ddp operation
|
|
*
|
|
* Copyright (c) 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.
|
|
*
|
|
* Written by: Karen Xie (kxie@chelsio.com)
|
|
*/
|
|
|
|
#ifndef __LIBCXGB_PPM_H__
|
|
#define __LIBCXGB_PPM_H__
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/types.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/list.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/bitmap.h>
|
|
|
|
struct cxgbi_pagepod_hdr {
|
|
u32 vld_tid;
|
|
u32 pgsz_tag_clr;
|
|
u32 max_offset;
|
|
u32 page_offset;
|
|
u64 rsvd;
|
|
};
|
|
|
|
#define PPOD_PAGES_MAX 4
|
|
struct cxgbi_pagepod {
|
|
struct cxgbi_pagepod_hdr hdr;
|
|
__be64 addr[PPOD_PAGES_MAX + 1];
|
|
};
|
|
|
|
/* ddp tag format
|
|
* for a 32-bit tag:
|
|
* bit #
|
|
* 31 ..... ..... 0
|
|
* X Y...Y Z...Z, where
|
|
* ^ ^^^^^ ^^^^
|
|
* | | |____ when ddp bit = 0: color bits
|
|
* | |
|
|
* | |____ when ddp bit = 0: idx into the ddp memory region
|
|
* |
|
|
* |____ ddp bit: 0 - ddp tag, 1 - non-ddp tag
|
|
*
|
|
* [page selector:2] [sw/free bits] [0] [idx] [color:6]
|
|
*/
|
|
|
|
#define DDP_PGIDX_MAX 4
|
|
#define DDP_PGSZ_BASE_SHIFT 12 /* base page 4K */
|
|
|
|
struct cxgbi_task_tag_info {
|
|
unsigned char flags;
|
|
#define CXGBI_PPOD_INFO_FLAG_VALID 0x1
|
|
#define CXGBI_PPOD_INFO_FLAG_MAPPED 0x2
|
|
unsigned char cid;
|
|
unsigned short pg_shift;
|
|
unsigned int npods;
|
|
unsigned int idx;
|
|
unsigned int tag;
|
|
struct cxgbi_pagepod_hdr hdr;
|
|
int nents;
|
|
int nr_pages;
|
|
struct scatterlist *sgl;
|
|
};
|
|
|
|
struct cxgbi_tag_format {
|
|
unsigned char pgsz_order[DDP_PGIDX_MAX];
|
|
unsigned char pgsz_idx_dflt;
|
|
unsigned char free_bits:4;
|
|
unsigned char color_bits:4;
|
|
unsigned char idx_bits;
|
|
unsigned char rsvd_bits;
|
|
unsigned int no_ddp_mask;
|
|
unsigned int idx_mask;
|
|
unsigned int color_mask;
|
|
unsigned int idx_clr_mask;
|
|
unsigned int rsvd_mask;
|
|
};
|
|
|
|
struct cxgbi_ppod_data {
|
|
unsigned char pg_idx:2;
|
|
unsigned char color:6;
|
|
unsigned char chan_id;
|
|
unsigned short npods;
|
|
unsigned long caller_data;
|
|
};
|
|
|
|
/* per cpu ppm pool */
|
|
struct cxgbi_ppm_pool {
|
|
unsigned int base; /* base index */
|
|
unsigned int next; /* next possible free index */
|
|
spinlock_t lock; /* ppm pool lock */
|
|
unsigned long bmap[0];
|
|
} ____cacheline_aligned_in_smp;
|
|
|
|
struct cxgbi_ppm {
|
|
struct kref refcnt;
|
|
struct net_device *ndev; /* net_device, 1st port */
|
|
struct pci_dev *pdev;
|
|
void *lldev;
|
|
void **ppm_pp;
|
|
struct cxgbi_tag_format tformat;
|
|
unsigned int ppmax;
|
|
unsigned int llimit;
|
|
unsigned int base_idx;
|
|
|
|
unsigned int pool_rsvd;
|
|
unsigned int pool_index_max;
|
|
struct cxgbi_ppm_pool __percpu *pool;
|
|
/* map lock */
|
|
spinlock_t map_lock; /* ppm map lock */
|
|
unsigned int bmap_index_max;
|
|
unsigned int next;
|
|
unsigned long *ppod_bmap;
|
|
struct cxgbi_ppod_data ppod_data[0];
|
|
};
|
|
|
|
#define DDP_THRESHOLD 512
|
|
|
|
#define PPOD_PAGES_SHIFT 2 /* 4 pages per pod */
|
|
|
|
#define IPPOD_SIZE sizeof(struct cxgbi_pagepod) /* 64 */
|
|
#define PPOD_SIZE_SHIFT 6
|
|
|
|
/* page pods are allocated in groups of this size (must be power of 2) */
|
|
#define PPOD_CLUSTER_SIZE 16U
|
|
|
|
#define ULPMEM_DSGL_MAX_NPPODS 16 /* 1024/PPOD_SIZE */
|
|
#define ULPMEM_IDATA_MAX_NPPODS 3 /* (PPOD_SIZE * 3 + ulptx hdr) < 256B */
|
|
#define PCIE_MEMWIN_MAX_NPPODS 16 /* 1024/PPOD_SIZE */
|
|
|
|
#define PPOD_COLOR_SHIFT 0
|
|
#define PPOD_COLOR(x) ((x) << PPOD_COLOR_SHIFT)
|
|
|
|
#define PPOD_IDX_SHIFT 6
|
|
#define PPOD_IDX_MAX_SIZE 24
|
|
|
|
#define PPOD_TID_SHIFT 0
|
|
#define PPOD_TID(x) ((x) << PPOD_TID_SHIFT)
|
|
|
|
#define PPOD_TAG_SHIFT 6
|
|
#define PPOD_TAG(x) ((x) << PPOD_TAG_SHIFT)
|
|
|
|
#define PPOD_VALID_SHIFT 24
|
|
#define PPOD_VALID(x) ((x) << PPOD_VALID_SHIFT)
|
|
#define PPOD_VALID_FLAG PPOD_VALID(1U)
|
|
|
|
#define PPOD_PI_EXTRACT_CTL_SHIFT 31
|
|
#define PPOD_PI_EXTRACT_CTL(x) ((x) << PPOD_PI_EXTRACT_CTL_SHIFT)
|
|
#define PPOD_PI_EXTRACT_CTL_FLAG V_PPOD_PI_EXTRACT_CTL(1U)
|
|
|
|
#define PPOD_PI_TYPE_SHIFT 29
|
|
#define PPOD_PI_TYPE_MASK 0x3
|
|
#define PPOD_PI_TYPE(x) ((x) << PPOD_PI_TYPE_SHIFT)
|
|
|
|
#define PPOD_PI_CHECK_CTL_SHIFT 27
|
|
#define PPOD_PI_CHECK_CTL_MASK 0x3
|
|
#define PPOD_PI_CHECK_CTL(x) ((x) << PPOD_PI_CHECK_CTL_SHIFT)
|
|
|
|
#define PPOD_PI_REPORT_CTL_SHIFT 25
|
|
#define PPOD_PI_REPORT_CTL_MASK 0x3
|
|
#define PPOD_PI_REPORT_CTL(x) ((x) << PPOD_PI_REPORT_CTL_SHIFT)
|
|
|
|
static inline int cxgbi_ppm_is_ddp_tag(struct cxgbi_ppm *ppm, u32 tag)
|
|
{
|
|
return !(tag & ppm->tformat.no_ddp_mask);
|
|
}
|
|
|
|
static inline int cxgbi_ppm_sw_tag_is_usable(struct cxgbi_ppm *ppm,
|
|
u32 tag)
|
|
{
|
|
/* the sw tag must be using <= 31 bits */
|
|
return !(tag & 0x80000000U);
|
|
}
|
|
|
|
static inline int cxgbi_ppm_make_non_ddp_tag(struct cxgbi_ppm *ppm,
|
|
u32 sw_tag,
|
|
u32 *final_tag)
|
|
{
|
|
struct cxgbi_tag_format *tformat = &ppm->tformat;
|
|
|
|
if (!cxgbi_ppm_sw_tag_is_usable(ppm, sw_tag)) {
|
|
pr_info("sw_tag 0x%x NOT usable.\n", sw_tag);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!sw_tag) {
|
|
*final_tag = tformat->no_ddp_mask;
|
|
} else {
|
|
unsigned int shift = tformat->idx_bits + tformat->color_bits;
|
|
u32 lower = sw_tag & tformat->idx_clr_mask;
|
|
u32 upper = (sw_tag >> shift) << (shift + 1);
|
|
|
|
*final_tag = upper | tformat->no_ddp_mask | lower;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline u32 cxgbi_ppm_decode_non_ddp_tag(struct cxgbi_ppm *ppm,
|
|
u32 tag)
|
|
{
|
|
struct cxgbi_tag_format *tformat = &ppm->tformat;
|
|
unsigned int shift = tformat->idx_bits + tformat->color_bits;
|
|
u32 lower = tag & tformat->idx_clr_mask;
|
|
u32 upper = (tag >> tformat->rsvd_bits) << shift;
|
|
|
|
return upper | lower;
|
|
}
|
|
|
|
static inline u32 cxgbi_ppm_ddp_tag_get_idx(struct cxgbi_ppm *ppm,
|
|
u32 ddp_tag)
|
|
{
|
|
u32 hw_idx = (ddp_tag >> PPOD_IDX_SHIFT) &
|
|
ppm->tformat.idx_mask;
|
|
|
|
return hw_idx - ppm->base_idx;
|
|
}
|
|
|
|
static inline u32 cxgbi_ppm_make_ddp_tag(unsigned int hw_idx,
|
|
unsigned char color)
|
|
{
|
|
return (hw_idx << PPOD_IDX_SHIFT) | ((u32)color);
|
|
}
|
|
|
|
static inline unsigned long
|
|
cxgbi_ppm_get_tag_caller_data(struct cxgbi_ppm *ppm,
|
|
u32 ddp_tag)
|
|
{
|
|
u32 idx = cxgbi_ppm_ddp_tag_get_idx(ppm, ddp_tag);
|
|
|
|
return ppm->ppod_data[idx].caller_data;
|
|
}
|
|
|
|
/* sw bits are the free bits */
|
|
static inline int cxgbi_ppm_ddp_tag_update_sw_bits(struct cxgbi_ppm *ppm,
|
|
u32 val, u32 orig_tag,
|
|
u32 *final_tag)
|
|
{
|
|
struct cxgbi_tag_format *tformat = &ppm->tformat;
|
|
u32 v = val >> tformat->free_bits;
|
|
|
|
if (v) {
|
|
pr_info("sw_bits 0x%x too large, avail bits %u.\n",
|
|
val, tformat->free_bits);
|
|
return -EINVAL;
|
|
}
|
|
if (!cxgbi_ppm_is_ddp_tag(ppm, orig_tag))
|
|
return -EINVAL;
|
|
|
|
*final_tag = (val << tformat->rsvd_bits) |
|
|
(orig_tag & ppm->tformat.rsvd_mask);
|
|
return 0;
|
|
}
|
|
|
|
static inline void cxgbi_ppm_ppod_clear(struct cxgbi_pagepod *ppod)
|
|
{
|
|
ppod->hdr.vld_tid = 0U;
|
|
}
|
|
|
|
static inline void cxgbi_tagmask_check(unsigned int tagmask,
|
|
struct cxgbi_tag_format *tformat)
|
|
{
|
|
unsigned int bits = fls(tagmask);
|
|
|
|
/* reserve top most 2 bits for page selector */
|
|
tformat->free_bits = 32 - 2 - bits;
|
|
tformat->rsvd_bits = bits;
|
|
tformat->color_bits = PPOD_IDX_SHIFT;
|
|
tformat->idx_bits = bits - 1 - PPOD_IDX_SHIFT;
|
|
tformat->no_ddp_mask = 1 << (bits - 1);
|
|
tformat->idx_mask = (1 << tformat->idx_bits) - 1;
|
|
tformat->color_mask = (1 << PPOD_IDX_SHIFT) - 1;
|
|
tformat->idx_clr_mask = (1 << (bits - 1)) - 1;
|
|
tformat->rsvd_mask = (1 << bits) - 1;
|
|
|
|
pr_info("ippm: tagmask 0x%x, rsvd %u=%u+%u+1, mask 0x%x,0x%x, "
|
|
"pg %u,%u,%u,%u.\n",
|
|
tagmask, tformat->rsvd_bits, tformat->idx_bits,
|
|
tformat->color_bits, tformat->no_ddp_mask, tformat->rsvd_mask,
|
|
tformat->pgsz_order[0], tformat->pgsz_order[1],
|
|
tformat->pgsz_order[2], tformat->pgsz_order[3]);
|
|
}
|
|
|
|
int cxgbi_ppm_find_page_index(struct cxgbi_ppm *ppm, unsigned long pgsz);
|
|
void cxgbi_ppm_make_ppod_hdr(struct cxgbi_ppm *ppm, u32 tag,
|
|
unsigned int tid, unsigned int offset,
|
|
unsigned int length,
|
|
struct cxgbi_pagepod_hdr *hdr);
|
|
void cxgbi_ppm_ppod_release(struct cxgbi_ppm *, u32 idx);
|
|
int cxgbi_ppm_ppods_reserve(struct cxgbi_ppm *, unsigned short nr_pages,
|
|
u32 per_tag_pg_idx, u32 *ppod_idx, u32 *ddp_tag,
|
|
unsigned long caller_data);
|
|
int cxgbi_ppm_init(void **ppm_pp, struct net_device *, struct pci_dev *,
|
|
void *lldev, struct cxgbi_tag_format *,
|
|
unsigned int ppmax, unsigned int llimit,
|
|
unsigned int start,
|
|
unsigned int reserve_factor);
|
|
int cxgbi_ppm_release(struct cxgbi_ppm *ppm);
|
|
void cxgbi_tagmask_check(unsigned int tagmask, struct cxgbi_tag_format *);
|
|
unsigned int cxgbi_tagmask_set(unsigned int ppmax);
|
|
|
|
#endif /*__LIBCXGB_PPM_H__*/
|