2 * cxgb3i_ddp.h: Chelsio S3xx iSCSI DDP Manager.
4 * Copyright (c) 2008 Chelsio Communications, Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation.
10 * Written by: Karen Xie (kxie@chelsio.com)
13 #ifndef __CXGB3I_ULP2_DDP_H__
14 #define __CXGB3I_ULP2_DDP_H__
16 #include <linux/vmalloc.h>
19 * struct cxgb3i_tag_format - cxgb3i ulp tag format for an iscsi entity
21 * @sw_bits: # of bits used by iscsi software layer
22 * @rsvd_bits: # of bits used by h/w
23 * @rsvd_shift: h/w bits shift left
24 * @rsvd_mask: reserved bit mask
26 struct cxgb3i_tag_format {
27 unsigned char sw_bits;
28 unsigned char rsvd_bits;
29 unsigned char rsvd_shift;
30 unsigned char filler[1];
35 * struct cxgb3i_gather_list - cxgb3i direct data placement memory
38 * @length: total data buffer length
39 * @offset: initial offset to the 1st page
41 * @pages: page pointers
42 * @phys_addr: physical address
44 struct cxgb3i_gather_list {
50 dma_addr_t phys_addr[0];
54 * struct cxgb3i_ddp_info - cxgb3i direct data placement for pdu payload
56 * @list: list head to link elements
57 * @tdev: pointer to t3cdev used by cxgb3 driver
58 * @max_txsz: max tx packet size for ddp
59 * @max_rxsz: max rx packet size for ddp
60 * @llimit: lower bound of the page pod memory
61 * @ulimit: upper bound of the page pod memory
62 * @nppods: # of page pod entries
63 * @idx_last: page pod entry last used
64 * @idx_bits: # of bits the pagepod index would take
65 * @idx_mask: pagepod index mask
66 * @rsvd_tag_mask: tag mask
67 * @map_lock: lock to synchonize access to the page pod map
68 * @gl_map: ddp memory gather list
69 * @gl_skb: skb used to program the pagepod
71 struct cxgb3i_ddp_info {
72 struct list_head list;
75 unsigned int max_txsz;
76 unsigned int max_rxsz;
80 unsigned int idx_last;
81 unsigned char idx_bits;
82 unsigned char filler[3];
86 struct cxgb3i_gather_list **gl_map;
87 struct sk_buff **gl_skb;
90 #define ULP2_MAX_PKT_SIZE 16224
91 #define ULP2_MAX_PDU_PAYLOAD (ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_MAX)
92 #define PPOD_PAGES_MAX 4
93 #define PPOD_PAGES_SHIFT 2 /* 4 pages per pod */
96 * struct pagepod_hdr, pagepod - pagepod format
107 struct pagepod_hdr hdr;
108 u64 addr[PPOD_PAGES_MAX + 1];
111 #define PPOD_SIZE sizeof(struct pagepod) /* 64 */
112 #define PPOD_SIZE_SHIFT 6
114 #define PPOD_COLOR_SHIFT 0
115 #define PPOD_COLOR_SIZE 6
116 #define PPOD_COLOR_MASK ((1 << PPOD_COLOR_SIZE) - 1)
118 #define PPOD_IDX_SHIFT PPOD_COLOR_SIZE
119 #define PPOD_IDX_MAX_SIZE 24
122 #define M_PPOD_TID 0xFFFFFF
123 #define V_PPOD_TID(x) ((x) << S_PPOD_TID)
125 #define S_PPOD_VALID 24
126 #define V_PPOD_VALID(x) ((x) << S_PPOD_VALID)
127 #define F_PPOD_VALID V_PPOD_VALID(1U)
129 #define S_PPOD_COLOR 0
130 #define M_PPOD_COLOR 0x3F
131 #define V_PPOD_COLOR(x) ((x) << S_PPOD_COLOR)
134 #define M_PPOD_TAG 0xFFFFFF
135 #define V_PPOD_TAG(x) ((x) << S_PPOD_TAG)
137 #define S_PPOD_PGSZ 30
138 #define M_PPOD_PGSZ 0x3
139 #define V_PPOD_PGSZ(x) ((x) << S_PPOD_PGSZ)
142 * large memory chunk allocation/release
143 * use vmalloc() if kmalloc() fails
145 static inline void *cxgb3i_alloc_big_mem(unsigned int size,
148 void *p = kmalloc(size, gfp);
156 static inline void cxgb3i_free_big_mem(void *addr)
158 if (is_vmalloc_addr(addr))
165 * cxgb3i ddp tag are 32 bits, it consists of reserved bits used by h/w and
166 * non-reserved bits that can be used by the iscsi s/w.
167 * The reserved bits are identified by the rsvd_bits and rsvd_shift fields
168 * in struct cxgb3i_tag_format.
170 * The upper most reserved bit can be used to check if a tag is ddp tag or not:
171 * if the bit is 0, the tag is a valid ddp tag
175 * cxgb3i_is_ddp_tag - check if a given tag is a hw/ddp tag
176 * @tformat: tag format information
177 * @tag: tag to be checked
179 * return true if the tag is a ddp tag, false otherwise.
181 static inline int cxgb3i_is_ddp_tag(struct cxgb3i_tag_format *tformat, u32 tag)
183 return !(tag & (1 << (tformat->rsvd_bits + tformat->rsvd_shift - 1)));
187 * cxgb3i_sw_tag_usable - check if a given s/w tag has enough bits left for
188 * the reserved/hw bits
189 * @tformat: tag format information
190 * @sw_tag: s/w tag to be checked
192 * return true if the tag is a ddp tag, false otherwise.
194 static inline int cxgb3i_sw_tag_usable(struct cxgb3i_tag_format *tformat,
197 sw_tag >>= (32 - tformat->rsvd_bits);
202 * cxgb3i_set_non_ddp_tag - mark a given s/w tag as an invalid ddp tag
203 * @tformat: tag format information
204 * @sw_tag: s/w tag to be checked
206 * insert 1 at the upper most reserved bit to mark it as an invalid ddp tag.
208 static inline u32 cxgb3i_set_non_ddp_tag(struct cxgb3i_tag_format *tformat,
211 unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
212 u32 mask = (1 << shift) - 1;
214 if (sw_tag && (sw_tag & ~mask)) {
215 u32 v1 = sw_tag & ((1 << shift) - 1);
216 u32 v2 = (sw_tag >> (shift - 1)) << shift;
218 return v2 | v1 | 1 << shift;
220 return sw_tag | 1 << shift;
224 * cxgb3i_ddp_tag_base - shift the s/w tag bits so that reserved bits are not
226 * @tformat: tag format information
227 * @sw_tag: s/w tag to be checked
229 static inline u32 cxgb3i_ddp_tag_base(struct cxgb3i_tag_format *tformat,
232 u32 mask = (1 << tformat->rsvd_shift) - 1;
234 if (sw_tag && (sw_tag & ~mask)) {
235 u32 v1 = sw_tag & mask;
236 u32 v2 = sw_tag >> tformat->rsvd_shift;
238 v2 <<= tformat->rsvd_shift + tformat->rsvd_bits;
245 * cxgb3i_tag_rsvd_bits - get the reserved bits used by the h/w
246 * @tformat: tag format information
247 * @tag: tag to be checked
249 * return the reserved bits in the tag
251 static inline u32 cxgb3i_tag_rsvd_bits(struct cxgb3i_tag_format *tformat,
254 if (cxgb3i_is_ddp_tag(tformat, tag))
255 return (tag >> tformat->rsvd_shift) & tformat->rsvd_mask;
260 * cxgb3i_tag_nonrsvd_bits - get the non-reserved bits used by the s/w
261 * @tformat: tag format information
262 * @tag: tag to be checked
264 * return the non-reserved bits in the tag.
266 static inline u32 cxgb3i_tag_nonrsvd_bits(struct cxgb3i_tag_format *tformat,
269 unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
272 if (cxgb3i_is_ddp_tag(tformat, tag)) {
273 v1 = tag & ((1 << tformat->rsvd_shift) - 1);
274 v2 = (tag >> (shift + 1)) << tformat->rsvd_shift;
276 u32 mask = (1 << shift) - 1;
278 tag &= ~(1 << shift);
280 v2 = (tag >> 1) & ~mask;
285 int cxgb3i_ddp_tag_reserve(struct t3cdev *, unsigned int tid,
286 struct cxgb3i_tag_format *, u32 *tag,
287 struct cxgb3i_gather_list *, gfp_t gfp);
288 void cxgb3i_ddp_tag_release(struct t3cdev *, u32 tag);
290 struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
291 struct scatterlist *sgl,
293 struct pci_dev *pdev,
295 void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
296 struct pci_dev *pdev);
298 int cxgb3i_setup_conn_host_pagesize(struct t3cdev *, unsigned int tid,
300 int cxgb3i_setup_conn_pagesize(struct t3cdev *, unsigned int tid, int reply,
302 int cxgb3i_setup_conn_digest(struct t3cdev *, unsigned int tid,
303 int hcrc, int dcrc, int reply);
304 int cxgb3i_ddp_find_page_index(unsigned long pgsz);
305 int cxgb3i_adapter_ddp_init(struct t3cdev *, struct cxgb3i_tag_format *,
306 unsigned int *txsz, unsigned int *rxsz);
307 void cxgb3i_adapter_ddp_cleanup(struct t3cdev *);