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[SCSI] libosd: OSD2r05: Prepare for rev5 attribute list changes 

In OSD2r05 draft each attribute list element header was changed
so attribute-value would be 8 bytes aligned. In OSD2r01-r04
it was aligned on 2 bytes. (This is because in OSD2r01 the complete
element was 8 bytes padded at end but the header was not adjusted
and caused permanent miss-alignment.)

OSD1 elements are not padded and might be or might not be aligned.
OSD1 is still supported.

In this code we do all the code re-factoring to separate OSD1/OSD2
differences but do not change actual wire format. All wire format
changes will happen in one patch later, for bisect-ability.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Boaz Harrosh 2009-04-19 19:11:42 +03:00 committed by James Bottomley
parent bf5e84f696
commit 71f32e31e5
2 changed files with 85 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

86
drivers/scsi/osd/osd_initiator.c
View File

@ -205,6 +205,69 @@ static unsigned _osd_req_alist_elem_size(struct osd_request *or, unsigned len)
osdv2_attr_list_elem_size(len);
}
static void _osd_req_alist_elem_encode(struct osd_request *or,
void *attr_last, const struct osd_attr *oa)
{
if (osd_req_is_ver1(or)) {
struct osdv1_attributes_list_element *attr = attr_last;
attr->attr_page = cpu_to_be32(oa->attr_page);
attr->attr_id = cpu_to_be32(oa->attr_id);
attr->attr_bytes = cpu_to_be16(oa->len);
memcpy(attr->attr_val, oa->val_ptr, oa->len);
} else {
struct osdv2_attributes_list_element *attr = attr_last;
attr->attr_page = cpu_to_be32(oa->attr_page);
attr->attr_id = cpu_to_be32(oa->attr_id);
attr->attr_bytes = cpu_to_be16(oa->len);
memcpy(attr->attr_val, oa->val_ptr, oa->len);
}
}
static int _osd_req_alist_elem_decode(struct osd_request *or,
void *cur_p, struct osd_attr *oa, unsigned max_bytes)
{
unsigned inc;
if (osd_req_is_ver1(or)) {
struct osdv1_attributes_list_element *attr = cur_p;
if (max_bytes < sizeof(*attr))
return -1;
oa->len = be16_to_cpu(attr->attr_bytes);
inc = _osd_req_alist_elem_size(or, oa->len);
if (inc > max_bytes)
return -1;
oa->attr_page = be32_to_cpu(attr->attr_page);
oa->attr_id = be32_to_cpu(attr->attr_id);
/* OSD1: On empty attributes we return a pointer to 2 bytes
* of zeros. This keeps similar behaviour with OSD2.
* (See below)
*/
oa->val_ptr = likely(oa->len) ? attr->attr_val :
(u8 *)&attr->attr_bytes;
} else {
struct osdv2_attributes_list_element *attr = cur_p;
if (max_bytes < sizeof(*attr))
return -1;
oa->len = be16_to_cpu(attr->attr_bytes);
inc = _osd_req_alist_elem_size(or, oa->len);
if (inc > max_bytes)
return -1;
oa->attr_page = be32_to_cpu(attr->attr_page);
oa->attr_id = be32_to_cpu(attr->attr_id);
oa->val_ptr = attr->attr_val;
}
return inc;
}
static unsigned _osd_req_alist_size(struct osd_request *or, void *list_head)
{
return osd_req_is_ver1(or) ?
@ -798,7 +861,6 @@ int osd_req_add_set_attr_list(struct osd_request *or,
attr_last = or->set_attr.buff + total_bytes;
for (; nelem; --nelem) {
struct osd_attributes_list_element *attr;
unsigned elem_size = _osd_req_alist_elem_size(or, oa->len);
total_bytes += elem_size;
@ -811,11 +873,7 @@ int osd_req_add_set_attr_list(struct osd_request *or,
or->set_attr.buff + or->set_attr.total_bytes;
}
attr = attr_last;
attr->attr_page = cpu_to_be32(oa->attr_page);
attr->attr_id = cpu_to_be32(oa->attr_id);
attr->attr_bytes = cpu_to_be16(oa->len);
memcpy(attr->attr_val, oa->val_ptr, oa->len);
_osd_req_alist_elem_encode(or, attr_last, oa);
attr_last += elem_size;
++oa;
@ -1070,15 +1128,10 @@ int osd_req_decode_get_attr_list(struct osd_request *or,
}
for (n = 0; (n < *nelem) && (cur_bytes < returned_bytes); ++n) {
struct osd_attributes_list_element *attr = cur_p;
unsigned inc;
int inc = _osd_req_alist_elem_decode(or, cur_p, oa,
returned_bytes - cur_bytes);
oa->len = be16_to_cpu(attr->attr_bytes);
inc = _osd_req_alist_elem_size(or, oa->len);
OSD_DEBUG("oa->len=%d inc=%d cur_bytes=%d\n",
oa->len, inc, cur_bytes);
cur_bytes += inc;
if (cur_bytes > returned_bytes) {
if (inc < 0) {
OSD_ERR("BAD FOOD from target. list not valid!"
"c=%d r=%d n=%d\n",
cur_bytes, returned_bytes, n);
@ -1086,10 +1139,7 @@ int osd_req_decode_get_attr_list(struct osd_request *or,
break;
}
oa->attr_page = be32_to_cpu(attr->attr_page);
oa->attr_id = be32_to_cpu(attr->attr_id);
oa->val_ptr = attr->attr_val;
cur_bytes += inc;
cur_p += inc;
++oa;
}

24
include/scsi/osd_protocol.h
View File

@ -301,14 +301,24 @@ struct osd_attributes_list_attrid {
} __packed;
/*
* osd2r03: 7.1.3.3 List entry format for retrieved attributes and
* for setting attributes
* NOTE: v2 is 8-bytes aligned, v1 is not aligned.
* NOTE: v1: is not aligned.
*/
struct osd_attributes_list_element {
struct osdv1_attributes_list_element {
__be32 attr_page;
__be32 attr_id;
__be16 attr_bytes;
__be16 attr_bytes; /* valid bytes at attr_val without padding */
u8 attr_val[0];
} __packed;
/*
* osd2r03: 7.1.3.3 List entry format for retrieved attributes and
* for setting attributes
* NOTE: v2 is 8-bytes aligned
*/
struct osdv2_attributes_list_element {
__be32 attr_page;
__be32 attr_id;
__be16 attr_bytes; /* valid bytes at attr_val without padding */
u8 attr_val[0];
} __packed;
@ -324,13 +334,13 @@ enum {
static inline unsigned osdv1_attr_list_elem_size(unsigned len)
{
return ALIGN(len + sizeof(struct osd_attributes_list_element),
return ALIGN(len + sizeof(struct osdv1_attributes_list_element),
OSDv1_ATTRIBUTES_ELEM_ALIGN);
}
static inline unsigned osdv2_attr_list_elem_size(unsigned len)
{
return ALIGN(len + sizeof(struct osd_attributes_list_element),
return ALIGN(len + sizeof(struct osdv2_attributes_list_element),
OSD_ATTRIBUTES_ELEM_ALIGN);
}