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sfc: Fill RX rings completely full, rather than to 95% full

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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>
This commit is contained in:
David Riddoch 2012-04-11 13:09:24 +01:00 committed by Ben Hutchings
parent 3de4e30196
commit da9ca50582
2 changed files with 4 additions and 14 deletions
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3
drivers/net/ethernet/sfc/net_driver.h
View file

@ -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;

15
drivers/net/ethernet/sfc/rx.c
View file

@ -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;