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sfc: Make the dmaq size a run-time setting (rather than compile-time)

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- Allow the ring size to be specified in non
   power-of-two sizes (for instance to limit
   the amount of receive buffers).
 - Automatically size the event queue.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steve Hodgson
2010-09-10 06:42:22 +00:00
committed by David S. Miller
parent 8313aca38b
commit ecc910f520
7 changed files with 109 additions and 76 deletions
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33
drivers/net/sfc/rx.c
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@@ -133,7 +133,7 @@ static int efx_init_rx_buffers_skb(struct efx_rx_queue *rx_queue)
unsigned index, count;
for (count = 0; count < EFX_RX_BATCH; ++count) {
index = rx_queue->added_count & EFX_RXQ_MASK;
index = rx_queue->added_count & rx_queue->ptr_mask;
rx_buf = efx_rx_buffer(rx_queue, index);
rx_buf->skb = netdev_alloc_skb(net_dev, skb_len);
@@ -208,7 +208,7 @@ static int efx_init_rx_buffers_page(struct efx_rx_queue *rx_queue)
dma_addr += sizeof(struct efx_rx_page_state);
split:
index = rx_queue->added_count & EFX_RXQ_MASK;
index = rx_queue->added_count & rx_queue->ptr_mask;
rx_buf = efx_rx_buffer(rx_queue, index);
rx_buf->dma_addr = dma_addr + EFX_PAGE_IP_ALIGN;
rx_buf->skb = NULL;
@@ -285,7 +285,7 @@ static void efx_resurrect_rx_buffer(struct efx_rx_queue *rx_queue,
* we'd like to insert an additional descriptor whilst leaving
* EFX_RXD_HEAD_ROOM for the non-recycle path */
fill_level = (rx_queue->added_count - rx_queue->removed_count + 2);
if (unlikely(fill_level >= EFX_RXQ_SIZE - EFX_RXD_HEAD_ROOM)) {
if (unlikely(fill_level > rx_queue->max_fill)) {
/* We could place "state" on a list, and drain the list in
* efx_fast_push_rx_descriptors(). For now, this will do. */
return;
@@ -294,7 +294,7 @@ static void efx_resurrect_rx_buffer(struct efx_rx_queue *rx_queue,
++state->refcnt;
get_page(rx_buf->page);
index = rx_queue->added_count & EFX_RXQ_MASK;
index = rx_queue->added_count & rx_queue->ptr_mask;
new_buf = efx_rx_buffer(rx_queue, index);
new_buf->dma_addr = rx_buf->dma_addr ^ (PAGE_SIZE >> 1);
new_buf->skb = NULL;
@@ -319,7 +319,7 @@ static void efx_recycle_rx_buffer(struct efx_channel *channel,
page_count(rx_buf->page) == 1)
efx_resurrect_rx_buffer(rx_queue, rx_buf);
index = rx_queue->added_count & EFX_RXQ_MASK;
index = rx_queue->added_count & rx_queue->ptr_mask;
new_buf = efx_rx_buffer(rx_queue, index);
memcpy(new_buf, rx_buf, sizeof(*new_buf));
@@ -347,7 +347,7 @@ void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue)
/* Calculate current fill level, and exit if we don't need to fill */
fill_level = (rx_queue->added_count - rx_queue->removed_count);
EFX_BUG_ON_PARANOID(fill_level > EFX_RXQ_SIZE);
EFX_BUG_ON_PARANOID(fill_level > rx_queue->efx->rxq_entries);
if (fill_level >= rx_queue->fast_fill_trigger)
goto out;
@@ -650,15 +650,22 @@ void efx_rx_strategy(struct efx_channel *channel)
int efx_probe_rx_queue(struct efx_rx_queue *rx_queue)
{
struct efx_nic *efx = rx_queue->efx;
unsigned int rxq_size;
unsigned int entries;
int rc;
/* Create the smallest power-of-two aligned ring */
entries = max(roundup_pow_of_two(efx->rxq_entries), EFX_MIN_DMAQ_SIZE);
EFX_BUG_ON_PARANOID(entries > EFX_MAX_DMAQ_SIZE);
rx_queue->ptr_mask = entries - 1;
netif_dbg(efx, probe, efx->net_dev,
"creating RX queue %d\n", efx_rx_queue_index(rx_queue));
"creating RX queue %d size %#x mask %#x\n",
efx_rx_queue_index(rx_queue), efx->rxq_entries,
rx_queue->ptr_mask);
/* Allocate RX buffers */
rxq_size = EFX_RXQ_SIZE * sizeof(*rx_queue->buffer);
rx_queue->buffer = kzalloc(rxq_size, GFP_KERNEL);
rx_queue->buffer = kzalloc(entries * sizeof(*rx_queue->buffer),
GFP_KERNEL);
if (!rx_queue->buffer)
return -ENOMEM;
@@ -672,6 +679,7 @@ 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;
netif_dbg(rx_queue->efx, drv, rx_queue->efx->net_dev,
@@ -682,10 +690,9 @@ void efx_init_rx_queue(struct efx_rx_queue *rx_queue)
rx_queue->notified_count = 0;
rx_queue->removed_count = 0;
rx_queue->min_fill = -1U;
rx_queue->min_overfill = -1U;
/* Initialise limit fields */
max_fill = EFX_RXQ_SIZE - EFX_RXD_HEAD_ROOM;
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;
@@ -710,7 +717,7 @@ void efx_fini_rx_queue(struct efx_rx_queue *rx_queue)
/* Release RX buffers NB start at index 0 not current HW ptr */
if (rx_queue->buffer) {
for (i = 0; i <= EFX_RXQ_MASK; i++) {
for (i = 0; i <= rx_queue->ptr_mask; i++) {
rx_buf = efx_rx_buffer(rx_queue, i);
efx_fini_rx_buffer(rx_queue, rx_buf);
}