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be2net: post buffers before destroying RXQs in Lancer 

An RX stall issue was seen on Lancer adapters, when RXQs are destroyed
while they are in an "out of buffer" state. This patch fixes this issue
by posting 64 buffers to each RXQ before destroying them in the close path.
This is done after ensuring that no more new packets are selected for
transfer to the RXQs by disabling interface filters.

Signed-off-by: Kalesh AP <kalesh.purayil@avagotech.com>
Signed-off-by: Sathya Perla <sathya.perla@avagotech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kalesh AP 2015-08-05 03:27:49 -04:00 committed by David S. Miller
parent bcc84140a6
commit 99b44304f2
1 changed files with 30 additions and 12 deletions
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42
drivers/net/ethernet/emulex/benet/be_main.c
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@ -2451,10 +2451,24 @@ static void be_eq_clean(struct be_eq_obj *eqo)
be_eq_notify(eqo->adapter, eqo->q.id, false, true, num, 0);
}
/* Free posted rx buffers that were not used */
static void be_rxq_clean(struct be_rx_obj *rxo)
{
struct be_queue_info *rxq = &rxo->q;
struct be_rx_page_info *page_info;
while (atomic_read(&rxq->used) > 0) {
page_info = get_rx_page_info(rxo);
put_page(page_info->page);
memset(page_info, 0, sizeof(*page_info));
}
BUG_ON(atomic_read(&rxq->used));
rxq->tail = 0;
rxq->head = 0;
}
static void be_rx_cq_clean(struct be_rx_obj *rxo)
{
struct be_rx_page_info *page_info;
struct be_queue_info *rxq = &rxo->q;
struct be_queue_info *rx_cq = &rxo->cq;
struct be_rx_compl_info *rxcp;
struct be_adapter *adapter = rxo->adapter;
@ -2491,16 +2505,6 @@ static void be_rx_cq_clean(struct be_rx_obj *rxo)
/* After cleanup, leave the CQ in unarmed state */
be_cq_notify(adapter, rx_cq->id, false, 0);
/* Then free posted rx buffers that were not used */
while (atomic_read(&rxq->used) > 0) {
page_info = get_rx_page_info(rxo);
put_page(page_info->page);
memset(page_info, 0, sizeof(*page_info));
}
BUG_ON(atomic_read(&rxq->used));
rxq->tail = 0;
rxq->head = 0;
}
static void be_tx_compl_clean(struct be_adapter *adapter)
@ -3358,8 +3362,22 @@ static void be_rx_qs_destroy(struct be_adapter *adapter)
for_all_rx_queues(adapter, rxo, i) {
q = &rxo->q;
if (q->created) {
/* If RXQs are destroyed while in an "out of buffer"
* state, there is a possibility of an HW stall on
* Lancer. So, post 64 buffers to each queue to relieve
* the "out of buffer" condition.
* Make sure there's space in the RXQ before posting.
*/
if (lancer_chip(adapter)) {
be_rx_cq_clean(rxo);
if (atomic_read(&q->used) == 0)
be_post_rx_frags(rxo, GFP_KERNEL,
MAX_RX_POST);
}
be_cmd_rxq_destroy(adapter, q);
be_rx_cq_clean(rxo);
be_rxq_clean(rxo);
}
be_queue_free(adapter, q);
}