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mpc85xx: revert the napi polling code to the one from an older kernel version to fix stability issues (#14020) 

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38409 3c298f89-4303-0410-b956-a3cf2f4a3e73
master
Felix Fietkau 2013-10-15 11:20:06 +00:00
parent 3b4aef3445
commit c5189ceb0f
1 changed files with 162 additions and 0 deletions
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162
target/linux/mpc85xx/patches-3.10/200-gianfar_napi_poll_revert.patch Normal file
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@ -0,0 +1,162 @@
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -132,7 +132,7 @@ static int gfar_poll(struct napi_struct
static void gfar_netpoll(struct net_device *dev);
#endif
int gfar_clean_rx_ring(struct gfar_priv_rx_q *rx_queue, int rx_work_limit);
-static void gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue);
+static int gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue);
static void gfar_process_frame(struct net_device *dev, struct sk_buff *skb,
int amount_pull, struct napi_struct *napi);
void gfar_halt(struct net_device *dev);
@@ -2475,7 +2475,7 @@ static void gfar_align_skb(struct sk_buf
}
/* Interrupt Handler for Transmit complete */
-static void gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue)
+static int gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue)
{
struct net_device *dev = tx_queue->dev;
struct netdev_queue *txq;
@@ -2575,6 +2575,8 @@ static void gfar_clean_tx_ring(struct gf
tx_queue->dirty_tx = bdp;
netdev_tx_completed_queue(txq, howmany, bytes_sent);
+
+ return howmany;
}
static void gfar_schedule_cleanup(struct gfar_priv_grp *gfargrp)
@@ -2833,82 +2835,62 @@ static int gfar_poll(struct napi_struct
struct gfar __iomem *regs = gfargrp->regs;
struct gfar_priv_tx_q *tx_queue = NULL;
struct gfar_priv_rx_q *rx_queue = NULL;
- int work_done = 0, work_done_per_q = 0;
- int i, budget_per_q = 0;
- int has_tx_work;
- unsigned long rstat_rxf;
- int num_act_queues;
+ int rx_cleaned = 0, budget_per_queue = 0, rx_cleaned_per_queue = 0;
+ int tx_cleaned = 0, i, left_over_budget = budget;
+ unsigned long serviced_queues = 0;
+ int num_queues = 0;
+
+ num_queues = gfargrp->num_rx_queues;
+ budget_per_queue = budget/num_queues;
/* Clear IEVENT, so interrupts aren't called again
* because of the packets that have already arrived
*/
gfar_write(&regs->ievent, IEVENT_RTX_MASK);
- rstat_rxf = gfar_read(&regs->rstat) & RSTAT_RXF_MASK;
-
- num_act_queues = bitmap_weight(&rstat_rxf, MAX_RX_QS);
- if (num_act_queues)
- budget_per_q = budget/num_act_queues;
-
- while (1) {
- has_tx_work = 0;
- for_each_set_bit(i, &gfargrp->tx_bit_map, priv->num_tx_queues) {
- tx_queue = priv->tx_queue[i];
- /* run Tx cleanup to completion */
- if (tx_queue->tx_skbuff[tx_queue->skb_dirtytx]) {
- gfar_clean_tx_ring(tx_queue);
- has_tx_work = 1;
- }
- }
+ while (num_queues && left_over_budget) {
+ budget_per_queue = left_over_budget/num_queues;
+ left_over_budget = 0;
for_each_set_bit(i, &gfargrp->rx_bit_map, priv->num_rx_queues) {
- /* skip queue if not active */
- if (!(rstat_rxf & (RSTAT_CLEAR_RXF0 >> i)))
+ if (test_bit(i, &serviced_queues))
continue;
-
rx_queue = priv->rx_queue[i];
- work_done_per_q =
- gfar_clean_rx_ring(rx_queue, budget_per_q);
- work_done += work_done_per_q;
-
- /* finished processing this queue */
- if (work_done_per_q < budget_per_q) {
- /* clear active queue hw indication */
- gfar_write(&regs->rstat,
- RSTAT_CLEAR_RXF0 >> i);
- rstat_rxf &= ~(RSTAT_CLEAR_RXF0 >> i);
- num_act_queues--;
-
- if (!num_act_queues)
- break;
- /* recompute budget per Rx queue */
- budget_per_q =
- (budget - work_done) / num_act_queues;
+ tx_queue = priv->tx_queue[rx_queue->qindex];
+
+ tx_cleaned += gfar_clean_tx_ring(tx_queue);
+ rx_cleaned_per_queue =
+ gfar_clean_rx_ring(rx_queue, budget_per_queue);
+ rx_cleaned += rx_cleaned_per_queue;
+ if (rx_cleaned_per_queue < budget_per_queue) {
+ left_over_budget = left_over_budget +
+ (budget_per_queue -
+ rx_cleaned_per_queue);
+ set_bit(i, &serviced_queues);
+ num_queues--;
}
}
+ }
- if (work_done >= budget)
- break;
-
- if (!num_act_queues && !has_tx_work) {
+ if (tx_cleaned)
+ return budget;
- napi_complete(napi);
+ if (rx_cleaned < budget) {
+ napi_complete(napi);
- /* Clear the halt bit in RSTAT */
- gfar_write(&regs->rstat, gfargrp->rstat);
+ /* Clear the halt bit in RSTAT */
+ gfar_write(&regs->rstat, gfargrp->rstat);
- gfar_write(&regs->imask, IMASK_DEFAULT);
+ gfar_write(&regs->imask, IMASK_DEFAULT);
- /* If we are coalescing interrupts, update the timer
- * Otherwise, clear it
- */
- gfar_configure_coalescing(priv, gfargrp->rx_bit_map,
- gfargrp->tx_bit_map);
- break;
- }
+ /* If we are coalescing interrupts, update the timer
+ * Otherwise, clear it
+ */
+ gfar_configure_coalescing(priv, gfargrp->rx_bit_map,
+ gfargrp->tx_bit_map);
}
- return work_done;
+ return rx_cleaned;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
--- a/drivers/net/ethernet/freescale/gianfar.h
+++ b/drivers/net/ethernet/freescale/gianfar.h
@@ -291,9 +291,7 @@ extern const char gfar_driver_version[];
#define RCTRL_PADDING(x) ((x << 16) & RCTRL_PAL_MASK)
-#define RSTAT_CLEAR_RHALT 0x00800000
-#define RSTAT_CLEAR_RXF0 0x00000080
-#define RSTAT_RXF_MASK 0x000000ff
+#define RSTAT_CLEAR_RHALT 0x00800000
#define TCTRL_IPCSEN 0x00004000
#define TCTRL_TUCSEN 0x00002000