+++ /dev/null
-/*
- * cxgb3i_ddp.h: Chelsio S3xx iSCSI DDP Manager.
- *
- * Copyright (c) 2008 Chelsio Communications, Inc.
- *
- * 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.
- *
- * Written by: Karen Xie (kxie@chelsio.com)
- */
-
-#ifndef __CXGB3I_ULP2_DDP_H__
-#define __CXGB3I_ULP2_DDP_H__
-
-#include <linux/slab.h>
-#include <linux/vmalloc.h>
-
-/**
- * struct cxgb3i_tag_format - cxgb3i ulp tag format for an iscsi entity
- *
- * @sw_bits: # of bits used by iscsi software layer
- * @rsvd_bits: # of bits used by h/w
- * @rsvd_shift: h/w bits shift left
- * @rsvd_mask: reserved bit mask
- */
-struct cxgb3i_tag_format {
- unsigned char sw_bits;
- unsigned char rsvd_bits;
- unsigned char rsvd_shift;
- unsigned char filler[1];
- u32 rsvd_mask;
-};
-
-/**
- * struct cxgb3i_gather_list - cxgb3i direct data placement memory
- *
- * @tag: ddp tag
- * @length: total data buffer length
- * @offset: initial offset to the 1st page
- * @nelem: # of pages
- * @pages: page pointers
- * @phys_addr: physical address
- */
-struct cxgb3i_gather_list {
- u32 tag;
- unsigned int length;
- unsigned int offset;
- unsigned int nelem;
- struct page **pages;
- dma_addr_t phys_addr[0];
-};
-
-/**
- * struct cxgb3i_ddp_info - cxgb3i direct data placement for pdu payload
- *
- * @list: list head to link elements
- * @refcnt: ref. count
- * @tdev: pointer to t3cdev used by cxgb3 driver
- * @max_txsz: max tx packet size for ddp
- * @max_rxsz: max rx packet size for ddp
- * @llimit: lower bound of the page pod memory
- * @ulimit: upper bound of the page pod memory
- * @nppods: # of page pod entries
- * @idx_last: page pod entry last used
- * @idx_bits: # of bits the pagepod index would take
- * @idx_mask: pagepod index mask
- * @rsvd_tag_mask: tag mask
- * @map_lock: lock to synchonize access to the page pod map
- * @gl_map: ddp memory gather list
- * @gl_skb: skb used to program the pagepod
- */
-struct cxgb3i_ddp_info {
- struct list_head list;
- struct kref refcnt;
- struct t3cdev *tdev;
- struct pci_dev *pdev;
- unsigned int max_txsz;
- unsigned int max_rxsz;
- unsigned int llimit;
- unsigned int ulimit;
- unsigned int nppods;
- unsigned int idx_last;
- unsigned char idx_bits;
- unsigned char filler[3];
- u32 idx_mask;
- u32 rsvd_tag_mask;
- spinlock_t map_lock;
- struct cxgb3i_gather_list **gl_map;
- struct sk_buff **gl_skb;
-};
-
-#define ISCSI_PDU_NONPAYLOAD_LEN 312 /* bhs(48) + ahs(256) + digest(8) */
-#define ULP2_MAX_PKT_SIZE 16224
-#define ULP2_MAX_PDU_PAYLOAD (ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_LEN)
-#define PPOD_PAGES_MAX 4
-#define PPOD_PAGES_SHIFT 2 /* 4 pages per pod */
-
-/*
- * struct pagepod_hdr, pagepod - pagepod format
- */
-struct pagepod_hdr {
- u32 vld_tid;
- u32 pgsz_tag_clr;
- u32 maxoffset;
- u32 pgoffset;
- u64 rsvd;
-};
-
-struct pagepod {
- struct pagepod_hdr hdr;
- u64 addr[PPOD_PAGES_MAX + 1];
-};
-
-#define PPOD_SIZE sizeof(struct pagepod) /* 64 */
-#define PPOD_SIZE_SHIFT 6
-
-#define PPOD_COLOR_SHIFT 0
-#define PPOD_COLOR_SIZE 6
-#define PPOD_COLOR_MASK ((1 << PPOD_COLOR_SIZE) - 1)
-
-#define PPOD_IDX_SHIFT PPOD_COLOR_SIZE
-#define PPOD_IDX_MAX_SIZE 24
-
-#define S_PPOD_TID 0
-#define M_PPOD_TID 0xFFFFFF
-#define V_PPOD_TID(x) ((x) << S_PPOD_TID)
-
-#define S_PPOD_VALID 24
-#define V_PPOD_VALID(x) ((x) << S_PPOD_VALID)
-#define F_PPOD_VALID V_PPOD_VALID(1U)
-
-#define S_PPOD_COLOR 0
-#define M_PPOD_COLOR 0x3F
-#define V_PPOD_COLOR(x) ((x) << S_PPOD_COLOR)
-
-#define S_PPOD_TAG 6
-#define M_PPOD_TAG 0xFFFFFF
-#define V_PPOD_TAG(x) ((x) << S_PPOD_TAG)
-
-#define S_PPOD_PGSZ 30
-#define M_PPOD_PGSZ 0x3
-#define V_PPOD_PGSZ(x) ((x) << S_PPOD_PGSZ)
-
-/*
- * large memory chunk allocation/release
- * use vmalloc() if kmalloc() fails
- */
-static inline void *cxgb3i_alloc_big_mem(unsigned int size,
- gfp_t gfp)
-{
- void *p = kmalloc(size, gfp);
- if (!p)
- p = vmalloc(size);
- if (p)
- memset(p, 0, size);
- return p;
-}
-
-static inline void cxgb3i_free_big_mem(void *addr)
-{
- if (is_vmalloc_addr(addr))
- vfree(addr);
- else
- kfree(addr);
-}
-
-/*
- * cxgb3i ddp tag are 32 bits, it consists of reserved bits used by h/w and
- * non-reserved bits that can be used by the iscsi s/w.
- * The reserved bits are identified by the rsvd_bits and rsvd_shift fields
- * in struct cxgb3i_tag_format.
- *
- * The upper most reserved bit can be used to check if a tag is ddp tag or not:
- * if the bit is 0, the tag is a valid ddp tag
- */
-
-/**
- * cxgb3i_is_ddp_tag - check if a given tag is a hw/ddp tag
- * @tformat: tag format information
- * @tag: tag to be checked
- *
- * return true if the tag is a ddp tag, false otherwise.
- */
-static inline int cxgb3i_is_ddp_tag(struct cxgb3i_tag_format *tformat, u32 tag)
-{
- return !(tag & (1 << (tformat->rsvd_bits + tformat->rsvd_shift - 1)));
-}
-
-/**
- * cxgb3i_sw_tag_usable - check if s/w tag has enough bits left for hw bits
- * @tformat: tag format information
- * @sw_tag: s/w tag to be checked
- *
- * return true if the tag can be used for hw ddp tag, false otherwise.
- */
-static inline int cxgb3i_sw_tag_usable(struct cxgb3i_tag_format *tformat,
- u32 sw_tag)
-{
- sw_tag >>= (32 - tformat->rsvd_bits);
- return !sw_tag;
-}
-
-/**
- * cxgb3i_set_non_ddp_tag - mark a given s/w tag as an invalid ddp tag
- * @tformat: tag format information
- * @sw_tag: s/w tag to be checked
- *
- * insert 1 at the upper most reserved bit to mark it as an invalid ddp tag.
- */
-static inline u32 cxgb3i_set_non_ddp_tag(struct cxgb3i_tag_format *tformat,
- u32 sw_tag)
-{
- unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
- u32 mask = (1 << shift) - 1;
-
- if (sw_tag && (sw_tag & ~mask)) {
- u32 v1 = sw_tag & ((1 << shift) - 1);
- u32 v2 = (sw_tag >> (shift - 1)) << shift;
-
- return v2 | v1 | 1 << shift;
- }
- return sw_tag | 1 << shift;
-}
-
-/**
- * cxgb3i_ddp_tag_base - shift s/w tag bits so that reserved bits are not used
- * @tformat: tag format information
- * @sw_tag: s/w tag to be checked
- */
-static inline u32 cxgb3i_ddp_tag_base(struct cxgb3i_tag_format *tformat,
- u32 sw_tag)
-{
- u32 mask = (1 << tformat->rsvd_shift) - 1;
-
- if (sw_tag && (sw_tag & ~mask)) {
- u32 v1 = sw_tag & mask;
- u32 v2 = sw_tag >> tformat->rsvd_shift;
-
- v2 <<= tformat->rsvd_shift + tformat->rsvd_bits;
- return v2 | v1;
- }
- return sw_tag;
-}
-
-/**
- * cxgb3i_tag_rsvd_bits - get the reserved bits used by the h/w
- * @tformat: tag format information
- * @tag: tag to be checked
- *
- * return the reserved bits in the tag
- */
-static inline u32 cxgb3i_tag_rsvd_bits(struct cxgb3i_tag_format *tformat,
- u32 tag)
-{
- if (cxgb3i_is_ddp_tag(tformat, tag))
- return (tag >> tformat->rsvd_shift) & tformat->rsvd_mask;
- return 0;
-}
-
-/**
- * cxgb3i_tag_nonrsvd_bits - get the non-reserved bits used by the s/w
- * @tformat: tag format information
- * @tag: tag to be checked
- *
- * return the non-reserved bits in the tag.
- */
-static inline u32 cxgb3i_tag_nonrsvd_bits(struct cxgb3i_tag_format *tformat,
- u32 tag)
-{
- unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
- u32 v1, v2;
-
- if (cxgb3i_is_ddp_tag(tformat, tag)) {
- v1 = tag & ((1 << tformat->rsvd_shift) - 1);
- v2 = (tag >> (shift + 1)) << tformat->rsvd_shift;
- } else {
- u32 mask = (1 << shift) - 1;
-
- tag &= ~(1 << shift);
- v1 = tag & mask;
- v2 = (tag >> 1) & ~mask;
- }
- return v1 | v2;
-}
-
-int cxgb3i_ddp_tag_reserve(struct t3cdev *, unsigned int tid,
- struct cxgb3i_tag_format *, u32 *tag,
- struct cxgb3i_gather_list *, gfp_t gfp);
-void cxgb3i_ddp_tag_release(struct t3cdev *, u32 tag);
-
-struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
- struct scatterlist *sgl,
- unsigned int sgcnt,
- struct pci_dev *pdev,
- gfp_t gfp);
-void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
- struct pci_dev *pdev);
-
-int cxgb3i_setup_conn_host_pagesize(struct t3cdev *, unsigned int tid,
- int reply);
-int cxgb3i_setup_conn_pagesize(struct t3cdev *, unsigned int tid, int reply,
- unsigned long pgsz);
-int cxgb3i_setup_conn_digest(struct t3cdev *, unsigned int tid,
- int hcrc, int dcrc, int reply);
-int cxgb3i_ddp_find_page_index(unsigned long pgsz);
-int cxgb3i_adapter_ddp_info(struct t3cdev *, struct cxgb3i_tag_format *,
- unsigned int *txsz, unsigned int *rxsz);
-
-void cxgb3i_ddp_init(struct t3cdev *);
-void cxgb3i_ddp_cleanup(struct t3cdev *);
-#endif
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