be2net: fix bug in rx page posting
Pages are posted to the rxq in such a way that more than one frag
can share the page. The last frag that uses the page unmaps the
page. In the case when a page is not fully used (due to lack of space in rxq)
the last frag that uses the page is not being set as a "last_page_user";
instead, the next frag in the rxq is incorrectly being set.
The fix has also been tested on ppc64 with 64k pages...
Signed-off-by: Sathya Perla <sathyap@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/benet/be_main.c b/drivers/net/benet/be_main.c
index 3a1f790..33ab8c7 100644
--- a/drivers/net/benet/be_main.c
+++ b/drivers/net/benet/be_main.c
@@ -910,7 +910,7 @@
static void be_post_rx_frags(struct be_adapter *adapter)
{
struct be_rx_page_info *page_info_tbl = adapter->rx_obj.page_info_tbl;
- struct be_rx_page_info *page_info = NULL;
+ struct be_rx_page_info *page_info = NULL, *prev_page_info = NULL;
struct be_queue_info *rxq = &adapter->rx_obj.q;
struct page *pagep = NULL;
struct be_eth_rx_d *rxd;
@@ -941,7 +941,6 @@
rxd = queue_head_node(rxq);
rxd->fragpa_lo = cpu_to_le32(frag_dmaaddr & 0xFFFFFFFF);
rxd->fragpa_hi = cpu_to_le32(upper_32_bits(frag_dmaaddr));
- queue_head_inc(rxq);
/* Any space left in the current big page for another frag? */
if ((page_offset + rx_frag_size + rx_frag_size) >
@@ -949,10 +948,13 @@
pagep = NULL;
page_info->last_page_user = true;
}
+
+ prev_page_info = page_info;
+ queue_head_inc(rxq);
page_info = &page_info_tbl[rxq->head];
}
if (pagep)
- page_info->last_page_user = true;
+ prev_page_info->last_page_user = true;
if (posted) {
atomic_add(posted, &rxq->used);