You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
90 lines
2.9 KiB
Diff
90 lines
2.9 KiB
Diff
Subject: net/ps3_gelic: Fix RX DMA restart
|
|
|
|
Fix the condition where PS3 network RX hangs when no network
|
|
TX is occuring by calling gelic_card_enable_rxdmac() during
|
|
RX_DMA_CHAIN_END event processing.
|
|
|
|
The gelic hardware automatically clears its RX_DMA_EN flag when
|
|
it detects an RX_DMA_CHAIN_END event. In its processing of
|
|
RX_DMA_CHAIN_END the gelic driver is required to set RX_DMA_EN
|
|
(with a call to gelic_card_enable_rxdmac()) to restart RX DMA
|
|
transfers. The existing gelic driver code does not set
|
|
RX_DMA_EN directly in its processing of the RX_DMA_CHAIN_END
|
|
event, but uses a flag variable card->rx_dma_restart_required
|
|
to schedule the setting of RX_DMA_EN until next inside the
|
|
interrupt handler.
|
|
|
|
It seems this delayed setting of RX_DMA_EN causes the hang since
|
|
the next RX interrupt after the RX_DMA_CHAIN_END event where
|
|
RX_DMA_EN is scheduled to be set will not occur since RX_DMA_EN
|
|
was not set. In the case were network TX is occuring, RX_DMA_EN
|
|
is set in the next TX interrupt and RX processing continues.
|
|
|
|
Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
|
|
---
|
|
drivers/net/ps3_gelic_net.c | 21 ++++++++-------------
|
|
drivers/net/ps3_gelic_net.h | 1 -
|
|
2 files changed, 8 insertions(+), 14 deletions(-)
|
|
|
|
--- a/drivers/net/ps3_gelic_net.c
|
|
+++ b/drivers/net/ps3_gelic_net.c
|
|
@@ -969,10 +969,6 @@ static int gelic_card_decode_one_descr(s
|
|
int dmac_chain_ended;
|
|
|
|
status = gelic_descr_get_status(descr);
|
|
- /* is this descriptor terminated with next_descr == NULL? */
|
|
- dmac_chain_ended =
|
|
- be32_to_cpu(descr->dmac_cmd_status) &
|
|
- GELIC_DESCR_RX_DMA_CHAIN_END;
|
|
|
|
if (status == GELIC_DESCR_DMA_CARDOWNED)
|
|
return 0;
|
|
@@ -1035,6 +1031,11 @@ static int gelic_card_decode_one_descr(s
|
|
/* ok, we've got a packet in descr */
|
|
gelic_net_pass_skb_up(descr, card, netdev);
|
|
refill:
|
|
+
|
|
+ /* is the current descriptor terminated with next_descr == NULL? */
|
|
+ dmac_chain_ended =
|
|
+ be32_to_cpu(descr->dmac_cmd_status) &
|
|
+ GELIC_DESCR_RX_DMA_CHAIN_END;
|
|
/*
|
|
* So that always DMAC can see the end
|
|
* of the descriptor chain to avoid
|
|
@@ -1063,10 +1064,9 @@ refill:
|
|
* If dmac chain was met, DMAC stopped.
|
|
* thus re-enable it
|
|
*/
|
|
- if (dmac_chain_ended) {
|
|
- card->rx_dma_restart_required = 1;
|
|
- dev_dbg(ctodev(card), "reenable rx dma scheduled\n");
|
|
- }
|
|
+
|
|
+ if (dmac_chain_ended)
|
|
+ gelic_card_enable_rxdmac(card);
|
|
|
|
return 1;
|
|
}
|
|
@@ -1132,11 +1132,6 @@ static irqreturn_t gelic_card_interrupt(
|
|
|
|
status &= card->irq_mask;
|
|
|
|
- if (card->rx_dma_restart_required) {
|
|
- card->rx_dma_restart_required = 0;
|
|
- gelic_card_enable_rxdmac(card);
|
|
- }
|
|
-
|
|
if (status & GELIC_CARD_RXINT) {
|
|
gelic_card_rx_irq_off(card);
|
|
napi_schedule(&card->napi);
|
|
--- a/drivers/net/ps3_gelic_net.h
|
|
+++ b/drivers/net/ps3_gelic_net.h
|
|
@@ -284,7 +284,6 @@ struct gelic_card {
|
|
|
|
struct gelic_descr_chain tx_chain;
|
|
struct gelic_descr_chain rx_chain;
|
|
- int rx_dma_restart_required;
|
|
int rx_csum;
|
|
/*
|
|
* tx_lock guards tx descriptor list and
|