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s390/qeth: use page pointers to manage RX buffer pool 

The RX buffer elements are always backed with full pages, reflect this
in the pointer type.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann 2020-03-11 18:07:09 +01:00 committed by David S. Miller
parent 2677625387
commit f81649dfa5
2 changed files with 18 additions and 19 deletions
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2
drivers/s390/net/qeth_core.h
View File

@ -369,7 +369,7 @@ enum qeth_qdio_info_states {
struct qeth_buffer_pool_entry {
struct list_head list;
struct list_head init_list;
void *elements[QDIO_MAX_ELEMENTS_PER_BUFFER];
struct page *elements[QDIO_MAX_ELEMENTS_PER_BUFFER];
};
struct qeth_qdio_buffer_pool {

35
drivers/s390/net/qeth_core_main.c
View File

@ -215,7 +215,6 @@ EXPORT_SYMBOL_GPL(qeth_clear_working_pool_list);
static int qeth_alloc_buffer_pool(struct qeth_card *card)
{
struct qeth_buffer_pool_entry *pool_entry;
void *ptr;
int i, j;
QETH_CARD_TEXT(card, 5, "alocpool");
@ -225,17 +224,18 @@ static int qeth_alloc_buffer_pool(struct qeth_card *card)
qeth_free_buffer_pool(card);
return -ENOMEM;
}
for (j = 0; j < QETH_MAX_BUFFER_ELEMENTS(card); ++j) {
ptr = (void *) __get_free_page(GFP_KERNEL);
if (!ptr) {
struct page *page = alloc_page(GFP_KERNEL);
if (!page) {
while (j > 0)
free_page((unsigned long)
pool_entry->elements[--j]);
__free_page(pool_entry->elements[--j]);
kfree(pool_entry);
qeth_free_buffer_pool(card);
return -ENOMEM;
}
pool_entry->elements[j] = ptr;
pool_entry->elements[j] = page;
}
list_add(&pool_entry->init_list,
&card->qdio.init_pool.entry_list);
@ -1177,7 +1177,7 @@ static void qeth_free_buffer_pool(struct qeth_card *card)
list_for_each_entry_safe(pool_entry, tmp,
&card->qdio.init_pool.entry_list, init_list){
for (i = 0; i < QETH_MAX_BUFFER_ELEMENTS(card); ++i)
free_page((unsigned long)pool_entry->elements[i]);
__free_page(pool_entry->elements[i]);
list_del(&pool_entry->init_list);
kfree(pool_entry);
}
@ -2573,7 +2573,6 @@ static struct qeth_buffer_pool_entry *qeth_find_free_buffer_pool_entry(
struct list_head *plh;
struct qeth_buffer_pool_entry *entry;
int i, free;
struct page *page;
if (list_empty(&card->qdio.in_buf_pool.entry_list))
return NULL;
@ -2582,7 +2581,7 @@ static struct qeth_buffer_pool_entry *qeth_find_free_buffer_pool_entry(
entry = list_entry(plh, struct qeth_buffer_pool_entry, list);
free = 1;
for (i = 0; i < QETH_MAX_BUFFER_ELEMENTS(card); ++i) {
if (page_count(virt_to_page(entry->elements[i])) > 1) {
if (page_count(entry->elements[i]) > 1) {
free = 0;
break;
}
@ -2597,15 +2596,15 @@ static struct qeth_buffer_pool_entry *qeth_find_free_buffer_pool_entry(
entry = list_entry(card->qdio.in_buf_pool.entry_list.next,
struct qeth_buffer_pool_entry, list);
for (i = 0; i < QETH_MAX_BUFFER_ELEMENTS(card); ++i) {
if (page_count(virt_to_page(entry->elements[i])) > 1) {
page = alloc_page(GFP_ATOMIC);
if (!page) {
if (page_count(entry->elements[i]) > 1) {
struct page *page = alloc_page(GFP_ATOMIC);
if (!page)
return NULL;
} else {
free_page((unsigned long)entry->elements[i]);
entry->elements[i] = page_address(page);
QETH_CARD_STAT_INC(card, rx_sg_alloc_page);
}
__free_page(entry->elements[i]);
entry->elements[i] = page;
QETH_CARD_STAT_INC(card, rx_sg_alloc_page);
}
}
list_del_init(&entry->list);
@ -2641,7 +2640,7 @@ static int qeth_init_input_buffer(struct qeth_card *card,
for (i = 0; i < QETH_MAX_BUFFER_ELEMENTS(card); ++i) {
buf->buffer->element[i].length = PAGE_SIZE;
buf->buffer->element[i].addr =
virt_to_phys(pool_entry->elements[i]);
page_to_phys(pool_entry->elements[i]);
if (i == QETH_MAX_BUFFER_ELEMENTS(card) - 1)
buf->buffer->element[i].eflags = SBAL_EFLAGS_LAST_ENTRY;
else