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authorDavid Riddoch <driddoch@solarflare.com>2012-04-11 13:09:24 +0100
committerBen Hutchings <bhutchings@solarflare.com>2012-05-10 02:22:17 +0100
commitda9ca505829f6c270b239536b1b169644d7cf072 (patch)
treea5ec93e6649c972576a60a56b4bd09d09d3b581a /drivers
parent3de4e30196f09ff2c096f2f8e17ebc9adda9db8d (diff)
sfc: Fill RX rings completely full, rather than to 95% full
There was no runtime control of the fast_fill_limit in any case, so purged that field. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/sfc/net_driver.h3
-rw-r--r--drivers/net/ethernet/sfc/rx.c15
2 files changed, 4 insertions, 14 deletions
diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index f0385e1fb2d8..eaca447e2a2b 100644
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -252,8 +252,6 @@ struct efx_rx_page_state {
* @max_fill: RX descriptor maximum fill level (<= ring size)
* @fast_fill_trigger: RX descriptor fill level that will trigger a fast fill
* (<= @max_fill)
- * @fast_fill_limit: The level to which a fast fill will fill
- * (@fast_fill_trigger <= @fast_fill_limit <= @max_fill)
* @min_fill: RX descriptor minimum non-zero fill level.
* This records the minimum fill level observed when a ring
* refill was triggered.
@@ -274,7 +272,6 @@ struct efx_rx_queue {
int removed_count;
unsigned int max_fill;
unsigned int fast_fill_trigger;
- unsigned int fast_fill_limit;
unsigned int min_fill;
unsigned int min_overfill;
unsigned int alloc_page_count;
diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c
index 763fa2fe1a38..254fec81894e 100644
--- a/drivers/net/ethernet/sfc/rx.c
+++ b/drivers/net/ethernet/sfc/rx.c
@@ -78,11 +78,6 @@ static int rx_alloc_method = RX_ALLOC_METHOD_AUTO;
*/
static unsigned int rx_refill_threshold = 90;
-/* This is the percentage fill level to which an RX queue will be refilled
- * when the "RX refill threshold" is reached.
- */
-static unsigned int rx_refill_limit = 95;
-
/*
* RX maximum head room required.
*
@@ -342,7 +337,7 @@ static void efx_recycle_rx_buffer(struct efx_channel *channel,
* efx_fast_push_rx_descriptors - push new RX descriptors quickly
* @rx_queue: RX descriptor queue
* This will aim to fill the RX descriptor queue up to
- * @rx_queue->@fast_fill_limit. If there is insufficient atomic
+ * @rx_queue->@max_fill. If there is insufficient atomic
* memory to do so, a slow fill will be scheduled.
*
* The caller must provide serialisation (none is used here). In practise,
@@ -367,7 +362,7 @@ void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue)
rx_queue->min_fill = fill_level;
}
- space = rx_queue->fast_fill_limit - fill_level;
+ space = rx_queue->max_fill - fill_level;
if (space < EFX_RX_BATCH)
goto out;
@@ -375,7 +370,7 @@ void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue)
"RX queue %d fast-filling descriptor ring from"
" level %d to level %d using %s allocation\n",
efx_rx_queue_index(rx_queue), fill_level,
- rx_queue->fast_fill_limit,
+ rx_queue->max_fill,
channel->rx_alloc_push_pages ? "page" : "skb");
do {
@@ -681,7 +676,7 @@ int efx_probe_rx_queue(struct efx_rx_queue *rx_queue)
void efx_init_rx_queue(struct efx_rx_queue *rx_queue)
{
struct efx_nic *efx = rx_queue->efx;
- unsigned int max_fill, trigger, limit;
+ unsigned int max_fill, trigger;
netif_dbg(rx_queue->efx, drv, rx_queue->efx->net_dev,
"initialising RX queue %d\n", efx_rx_queue_index(rx_queue));
@@ -695,11 +690,9 @@ void efx_init_rx_queue(struct efx_rx_queue *rx_queue)
/* Initialise limit fields */
max_fill = efx->rxq_entries - EFX_RXD_HEAD_ROOM;
trigger = max_fill * min(rx_refill_threshold, 100U) / 100U;
- limit = max_fill * min(rx_refill_limit, 100U) / 100U;
rx_queue->max_fill = max_fill;
rx_queue->fast_fill_trigger = trigger;
- rx_queue->fast_fill_limit = limit;
/* Set up RX descriptor ring */
rx_queue->enabled = true;