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Commit e941ba86 authored by David S. Miller's avatar David S. Miller
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Merge branch 'gianfar-fixes' 

Jakub Kicinski says:

====================
gianfar: filer changes

respinning with examples as requested.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents b02e3e94 1f2b7293
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Showing with 4 additions and 341 deletions
drivers/net/ethernet/freescale/gianfar_ethtool.c
View file @ e941ba86
......@@ -900,27 +900,6 @@ static int gfar_check_filer_hardware(struct gfar_private *priv)
return 0;
}
static int gfar_comp_asc(const void *a, const void *b)
{
return memcmp(a, b, 4);
}
static int gfar_comp_desc(const void *a, const void *b)
{
return -memcmp(a, b, 4);
}
static void gfar_swap(void *a, void *b, int size)
{
u32 *_a = a;
u32 *_b = b;
swap(_a[0], _b[0]);
swap(_a[1], _b[1]);
swap(_a[2], _b[2]);
swap(_a[3], _b[3]);
}
/* Write a mask to filer cache */
static void gfar_set_mask(u32 mask, struct filer_table *tab)
{
......@@ -1270,310 +1249,6 @@ static int gfar_convert_to_filer(struct ethtool_rx_flow_spec *rule,
return 0;
}
/* Copy size filer entries */
static void gfar_copy_filer_entries(struct gfar_filer_entry dst[0],
struct gfar_filer_entry src[0], s32 size)
{
while (size > 0) {
size--;
dst[size].ctrl = src[size].ctrl;
dst[size].prop = src[size].prop;
}
}
/* Delete the contents of the filer-table between start and end
* and collapse them
*/
static int gfar_trim_filer_entries(u32 begin, u32 end, struct filer_table *tab)
{
int length;
if (end > MAX_FILER_CACHE_IDX || end < begin)
return -EINVAL;
end++;
length = end - begin;
/* Copy */
while (end < tab->index) {
tab->fe[begin].ctrl = tab->fe[end].ctrl;
tab->fe[begin++].prop = tab->fe[end++].prop;
}
/* Fill up with don't cares */
while (begin < tab->index) {
tab->fe[begin].ctrl = 0x60;
tab->fe[begin].prop = 0xFFFFFFFF;
begin++;
}
tab->index -= length;
return 0;
}
/* Make space on the wanted location */
static int gfar_expand_filer_entries(u32 begin, u32 length,
struct filer_table *tab)
{
if (length == 0 || length + tab->index > MAX_FILER_CACHE_IDX ||
begin > MAX_FILER_CACHE_IDX)
return -EINVAL;
gfar_copy_filer_entries(&(tab->fe[begin + length]), &(tab->fe[begin]),
tab->index - length + 1);
tab->index += length;
return 0;
}
static int gfar_get_next_cluster_start(int start, struct filer_table *tab)
{
for (; (start < tab->index) && (start < MAX_FILER_CACHE_IDX - 1);
start++) {
if ((tab->fe[start].ctrl & (RQFCR_AND | RQFCR_CLE)) ==
(RQFCR_AND | RQFCR_CLE))
return start;
}
return -1;
}
static int gfar_get_next_cluster_end(int start, struct filer_table *tab)
{
for (; (start < tab->index) && (start < MAX_FILER_CACHE_IDX - 1);
start++) {
if ((tab->fe[start].ctrl & (RQFCR_AND | RQFCR_CLE)) ==
(RQFCR_CLE))
return start;
}
return -1;
}
/* Uses hardwares clustering option to reduce
* the number of filer table entries
*/
static void gfar_cluster_filer(struct filer_table *tab)
{
s32 i = -1, j, iend, jend;
while ((i = gfar_get_next_cluster_start(++i, tab)) != -1) {
j = i;
while ((j = gfar_get_next_cluster_start(++j, tab)) != -1) {
/* The cluster entries self and the previous one
* (a mask) must be identical!
*/
if (tab->fe[i].ctrl != tab->fe[j].ctrl)
break;
if (tab->fe[i].prop != tab->fe[j].prop)
break;
if (tab->fe[i - 1].ctrl != tab->fe[j - 1].ctrl)
break;
if (tab->fe[i - 1].prop != tab->fe[j - 1].prop)
break;
iend = gfar_get_next_cluster_end(i, tab);
jend = gfar_get_next_cluster_end(j, tab);
if (jend == -1 || iend == -1)
break;
/* First we make some free space, where our cluster
* element should be. Then we copy it there and finally
* delete in from its old location.
*/
if (gfar_expand_filer_entries(iend, (jend - j), tab) ==
-EINVAL)
break;
gfar_copy_filer_entries(&(tab->fe[iend + 1]),
&(tab->fe[jend + 1]), jend - j);
if (gfar_trim_filer_entries(jend - 1,
jend + (jend - j),
tab) == -EINVAL)
return;
/* Mask out cluster bit */
tab->fe[iend].ctrl &= ~(RQFCR_CLE);
}
}
}
/* Swaps the masked bits of a1<>a2 and b1<>b2 */
static void gfar_swap_bits(struct gfar_filer_entry *a1,
struct gfar_filer_entry *a2,
struct gfar_filer_entry *b1,
struct gfar_filer_entry *b2, u32 mask)
{
u32 temp[4];
temp[0] = a1->ctrl & mask;
temp[1] = a2->ctrl & mask;
temp[2] = b1->ctrl & mask;
temp[3] = b2->ctrl & mask;
a1->ctrl &= ~mask;
a2->ctrl &= ~mask;
b1->ctrl &= ~mask;
b2->ctrl &= ~mask;
a1->ctrl |= temp[1];
a2->ctrl |= temp[0];
b1->ctrl |= temp[3];
b2->ctrl |= temp[2];
}
/* Generate a list consisting of masks values with their start and
* end of validity and block as indicator for parts belonging
* together (glued by ANDs) in mask_table
*/
static u32 gfar_generate_mask_table(struct gfar_mask_entry *mask_table,
struct filer_table *tab)
{
u32 i, and_index = 0, block_index = 1;
for (i = 0; i < tab->index; i++) {
/* LSByte of control = 0 sets a mask */
if (!(tab->fe[i].ctrl & 0xF)) {
mask_table[and_index].mask = tab->fe[i].prop;
mask_table[and_index].start = i;
mask_table[and_index].block = block_index;
if (and_index >= 1)
mask_table[and_index - 1].end = i - 1;
and_index++;
}
/* cluster starts and ends will be separated because they should
* hold their position
*/
if (tab->fe[i].ctrl & RQFCR_CLE)
block_index++;
/* A not set AND indicates the end of a depended block */
if (!(tab->fe[i].ctrl & RQFCR_AND))
block_index++;
}
mask_table[and_index - 1].end = i - 1;
return and_index;
}
/* Sorts the entries of mask_table by the values of the masks.
* Important: The 0xFF80 flags of the first and last entry of a
* block must hold their position (which queue, CLusterEnable, ReJEct,
* AND)
*/
static void gfar_sort_mask_table(struct gfar_mask_entry *mask_table,
struct filer_table *temp_table, u32 and_index)
{
/* Pointer to compare function (_asc or _desc) */
int (*gfar_comp)(const void *, const void *);
u32 i, size = 0, start = 0, prev = 1;
u32 old_first, old_last, new_first, new_last;
gfar_comp = &gfar_comp_desc;
for (i = 0; i < and_index; i++) {
if (prev != mask_table[i].block) {
old_first = mask_table[start].start + 1;
old_last = mask_table[i - 1].end;
sort(mask_table + start, size,
sizeof(struct gfar_mask_entry),
gfar_comp, &gfar_swap);
/* Toggle order for every block. This makes the
* thing more efficient!
*/
if (gfar_comp == gfar_comp_desc)
gfar_comp = &gfar_comp_asc;
else
gfar_comp = &gfar_comp_desc;
new_first = mask_table[start].start + 1;
new_last = mask_table[i - 1].end;
gfar_swap_bits(&temp_table->fe[new_first],
&temp_table->fe[old_first],
&temp_table->fe[new_last],
&temp_table->fe[old_last],
RQFCR_QUEUE | RQFCR_CLE |
RQFCR_RJE | RQFCR_AND);
start = i;
size = 0;
}
size++;
prev = mask_table[i].block;
}
}
/* Reduces the number of masks needed in the filer table to save entries
* This is done by sorting the masks of a depended block. A depended block is
* identified by gluing ANDs or CLE. The sorting order toggles after every
* block. Of course entries in scope of a mask must change their location with
* it.
*/
static int gfar_optimize_filer_masks(struct filer_table *tab)
{
struct filer_table *temp_table;
struct gfar_mask_entry *mask_table;
u32 and_index = 0, previous_mask = 0, i = 0, j = 0, size = 0;
s32 ret = 0;
/* We need a copy of the filer table because
* we want to change its order
*/
temp_table = kmemdup(tab, sizeof(*temp_table), GFP_KERNEL);
if (temp_table == NULL)
return -ENOMEM;
mask_table = kcalloc(MAX_FILER_CACHE_IDX / 2 + 1,
sizeof(struct gfar_mask_entry), GFP_KERNEL);
if (mask_table == NULL) {
ret = -ENOMEM;
goto end;
}
and_index = gfar_generate_mask_table(mask_table, tab);
gfar_sort_mask_table(mask_table, temp_table, and_index);
/* Now we can copy the data from our duplicated filer table to
* the real one in the order the mask table says
*/
for (i = 0; i < and_index; i++) {
size = mask_table[i].end - mask_table[i].start + 1;
gfar_copy_filer_entries(&(tab->fe[j]),
&(temp_table->fe[mask_table[i].start]), size);
j += size;
}
/* And finally we just have to check for duplicated masks and drop the
* second ones
*/
for (i = 0; i < tab->index && i < MAX_FILER_CACHE_IDX; i++) {
if (tab->fe[i].ctrl == 0x80) {
previous_mask = i++;
break;
}
}
for (; i < tab->index && i < MAX_FILER_CACHE_IDX; i++) {
if (tab->fe[i].ctrl == 0x80) {
if (tab->fe[i].prop == tab->fe[previous_mask].prop) {
/* Two identical ones found!
* So drop the second one!
*/
gfar_trim_filer_entries(i, i, tab);
} else
/* Not identical! */
previous_mask = i;
}
}
kfree(mask_table);
end: kfree(temp_table);
return ret;
}
/* Write the bit-pattern from software's buffer to hardware registers */
static int gfar_write_filer_table(struct gfar_private *priv,
struct filer_table *tab)
......@@ -1583,11 +1258,10 @@ static int gfar_write_filer_table(struct gfar_private *priv,
return -EBUSY;
/* Fill regular entries */
for (; i < MAX_FILER_IDX - 1 && (tab->fe[i].ctrl | tab->fe[i].prop);
i++)
for (; i < MAX_FILER_IDX && (tab->fe[i].ctrl | tab->fe[i].prop); i++)
gfar_write_filer(priv, i, tab->fe[i].ctrl, tab->fe[i].prop);
/* Fill the rest with fall-troughs */
for (; i < MAX_FILER_IDX - 1; i++)
for (; i < MAX_FILER_IDX; i++)
gfar_write_filer(priv, i, 0x60, 0xFFFFFFFF);
/* Last entry must be default accept
* because that's what people expect
......@@ -1621,7 +1295,6 @@ static int gfar_process_filer_changes(struct gfar_private *priv)
{
struct ethtool_flow_spec_container *j;
struct filer_table *tab;
s32 i = 0;
s32 ret = 0;
/* So index is set to zero, too! */
......@@ -1646,17 +1319,6 @@ static int gfar_process_filer_changes(struct gfar_private *priv)
}
}
i = tab->index;
/* Optimizations to save entries */
gfar_cluster_filer(tab);
gfar_optimize_filer_masks(tab);
pr_debug("\tSummary:\n"
"\tData on hardware: %d\n"
"\tCompression rate: %d%%\n",
tab->index, 100 - (100 * tab->index) / i);
/* Write everything to hardware */
ret = gfar_write_filer_table(priv, tab);
if (ret == -EBUSY) {
......@@ -1722,13 +1384,14 @@ static int gfar_add_cls(struct gfar_private *priv,
}
process:
priv->rx_list.count++;
ret = gfar_process_filer_changes(priv);
if (ret)
goto clean_list;
priv->rx_list.count++;
return ret;
clean_list:
priv->rx_list.count--;
list_del(&temp->list);
clean_mem:
kfree(temp);
......
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