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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/net/sfc/efx.c
View File

@ -348,7 +348,7 @@ void efx_process_channel_now(struct efx_channel *channel)
napi_disable(&channel->napi_str);
/* Poll the channel */
efx_process_channel(channel, EFX_EVQ_SIZE);
efx_process_channel(channel, channel->eventq_mask + 1);
/* Ack the eventq. This may cause an interrupt to be generated
* when they are reenabled */
@ -365,9 +365,18 @@ void efx_process_channel_now(struct efx_channel *channel)
*/
static int efx_probe_eventq(struct efx_channel *channel)
{
struct efx_nic *efx = channel->efx;
unsigned long entries;
netif_dbg(channel->efx, probe, channel->efx->net_dev,
"chan %d create event queue\n", channel->channel);
/* Build an event queue with room for one event per tx and rx buffer,
* plus some extra for link state events and MCDI completions. */
entries = roundup_pow_of_two(efx->rxq_entries + efx->txq_entries + 128);
EFX_BUG_ON_PARANOID(entries > EFX_MAX_EVQ_SIZE);
channel->eventq_mask = max(entries, EFX_MIN_EVQ_SIZE) - 1;
return efx_nic_probe_eventq(channel);
}
@ -1191,6 +1200,7 @@ static int efx_probe_all(struct efx_nic *efx)
}
/* Create channels */
efx->rxq_entries = efx->txq_entries = EFX_DEFAULT_DMAQ_SIZE;
efx_for_each_channel(channel, efx) {
rc = efx_probe_channel(channel);
if (rc) {
@ -2101,9 +2111,6 @@ static int efx_init_struct(struct efx_nic *efx, struct efx_nic_type *type,
efx->type = type;
/* As close as we can get to guaranteeing that we don't overflow */
BUILD_BUG_ON(EFX_EVQ_SIZE < EFX_TXQ_SIZE + EFX_RXQ_SIZE);
EFX_BUG_ON_PARANOID(efx->type->phys_addr_channels > EFX_MAX_CHANNELS);
/* Higher numbered interrupt modes are less capable! */

13
drivers/net/sfc/efx.h
View File

@ -37,8 +37,6 @@ efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb);
extern void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index);
extern void efx_stop_queue(struct efx_channel *channel);
extern void efx_wake_queue(struct efx_channel *channel);
#define EFX_TXQ_SIZE 1024
#define EFX_TXQ_MASK (EFX_TXQ_SIZE - 1)
/* RX */
extern int efx_probe_rx_queue(struct efx_rx_queue *rx_queue);
@ -53,13 +51,16 @@ extern void __efx_rx_packet(struct efx_channel *channel,
extern void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
unsigned int len, bool checksummed, bool discard);
extern void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue);
#define EFX_RXQ_SIZE 1024
#define EFX_RXQ_MASK (EFX_RXQ_SIZE - 1)
#define EFX_MAX_DMAQ_SIZE 4096UL
#define EFX_DEFAULT_DMAQ_SIZE 1024UL
#define EFX_MIN_DMAQ_SIZE 512UL
#define EFX_MAX_EVQ_SIZE 16384UL
#define EFX_MIN_EVQ_SIZE 512UL
/* Channels */
extern void efx_process_channel_now(struct efx_channel *channel);
#define EFX_EVQ_SIZE 4096
#define EFX_EVQ_MASK (EFX_EVQ_SIZE - 1)
/* Ports */
extern int efx_reconfigure_port(struct efx_nic *efx);

13
drivers/net/sfc/net_driver.h
View File

@ -137,6 +137,7 @@ struct efx_tx_buffer {
* @channel: The associated channel
* @buffer: The software buffer ring
* @txd: The hardware descriptor ring
* @ptr_mask: The size of the ring minus 1.
* @flushed: Used when handling queue flushing
* @read_count: Current read pointer.
* This is the number of buffers that have been removed from both rings.
@ -170,6 +171,7 @@ struct efx_tx_queue {
struct efx_nic *nic;
struct efx_tx_buffer *buffer;
struct efx_special_buffer txd;
unsigned int ptr_mask;
enum efx_flush_state flushed;
/* Members used mainly on the completion path */
@ -227,6 +229,7 @@ struct efx_rx_page_state {
* @efx: The associated Efx NIC
* @buffer: The software buffer ring
* @rxd: The hardware descriptor ring
* @ptr_mask: The size of the ring minus 1.
* @added_count: Number of buffers added to the receive queue.
* @notified_count: Number of buffers given to NIC (<= @added_count).
* @removed_count: Number of buffers removed from the receive queue.
@ -238,9 +241,6 @@ struct efx_rx_page_state {
* @min_fill: RX descriptor minimum non-zero fill level.
* This records the minimum fill level observed when a ring
* refill was triggered.
* @min_overfill: RX descriptor minimum overflow fill level.
* This records the minimum fill level at which RX queue
* overflow was observed. It should never be set.
* @alloc_page_count: RX allocation strategy counter.
* @alloc_skb_count: RX allocation strategy counter.
* @slow_fill: Timer used to defer efx_nic_generate_fill_event().
@ -250,6 +250,7 @@ struct efx_rx_queue {
struct efx_nic *efx;
struct efx_rx_buffer *buffer;
struct efx_special_buffer rxd;
unsigned int ptr_mask;
int added_count;
int notified_count;
@ -307,6 +308,7 @@ enum efx_rx_alloc_method {
* @reset_work: Scheduled reset work thread
* @work_pending: Is work pending via NAPI?
* @eventq: Event queue buffer
* @eventq_mask: Event queue pointer mask
* @eventq_read_ptr: Event queue read pointer
* @last_eventq_read_ptr: Last event queue read pointer value.
* @magic_count: Event queue test event count
@ -339,6 +341,7 @@ struct efx_channel {
struct napi_struct napi_str;
bool work_pending;
struct efx_special_buffer eventq;
unsigned int eventq_mask;
unsigned int eventq_read_ptr;
unsigned int last_eventq_read_ptr;
unsigned int magic_count;
@ -641,6 +644,8 @@ union efx_multicast_hash {
* @tx_queue: TX DMA queues
* @rx_queue: RX DMA queues
* @channel: Channels
* @rxq_entries: Size of receive queues requested by user.
* @txq_entries: Size of transmit queues requested by user.
* @next_buffer_table: First available buffer table id
* @n_channels: Number of channels in use
* @n_rx_channels: Number of channels used for RX (= number of RX queues)
@ -726,6 +731,8 @@ struct efx_nic {
struct efx_channel *channel[EFX_MAX_CHANNELS];
unsigned rxq_entries;
unsigned txq_entries;
unsigned next_buffer_table;
unsigned n_channels;
unsigned n_rx_channels;

53
drivers/net/sfc/nic.c
View File

@ -356,7 +356,7 @@ static inline void efx_notify_tx_desc(struct efx_tx_queue *tx_queue)
unsigned write_ptr;
efx_dword_t reg;
write_ptr = tx_queue->write_count & EFX_TXQ_MASK;
write_ptr = tx_queue->write_count & tx_queue->ptr_mask;
EFX_POPULATE_DWORD_1(reg, FRF_AZ_TX_DESC_WPTR_DWORD, write_ptr);
efx_writed_page(tx_queue->efx, &reg,
FR_AZ_TX_DESC_UPD_DWORD_P0, tx_queue->queue);
@ -377,7 +377,7 @@ void efx_nic_push_buffers(struct efx_tx_queue *tx_queue)
BUG_ON(tx_queue->write_count == tx_queue->insert_count);
do {
write_ptr = tx_queue->write_count & EFX_TXQ_MASK;
write_ptr = tx_queue->write_count & tx_queue->ptr_mask;
buffer = &tx_queue->buffer[write_ptr];
txd = efx_tx_desc(tx_queue, write_ptr);
++tx_queue->write_count;
@ -398,10 +398,11 @@ void efx_nic_push_buffers(struct efx_tx_queue *tx_queue)
int efx_nic_probe_tx(struct efx_tx_queue *tx_queue)
{
struct efx_nic *efx = tx_queue->efx;
BUILD_BUG_ON(EFX_TXQ_SIZE < 512 || EFX_TXQ_SIZE > 4096 ||
EFX_TXQ_SIZE & EFX_TXQ_MASK);
unsigned entries;
entries = tx_queue->ptr_mask + 1;
return efx_alloc_special_buffer(efx, &tx_queue->txd,
EFX_TXQ_SIZE * sizeof(efx_qword_t));
entries * sizeof(efx_qword_t));
}
void efx_nic_init_tx(struct efx_tx_queue *tx_queue)
@ -526,30 +527,32 @@ efx_build_rx_desc(struct efx_rx_queue *rx_queue, unsigned index)
*/
void efx_nic_notify_rx_desc(struct efx_rx_queue *rx_queue)
{
struct efx_nic *efx = rx_queue->efx;
efx_dword_t reg;
unsigned write_ptr;
while (rx_queue->notified_count != rx_queue->added_count) {
efx_build_rx_desc(rx_queue,
rx_queue->notified_count &
EFX_RXQ_MASK);
efx_build_rx_desc(
rx_queue,
rx_queue->notified_count & rx_queue->ptr_mask);
++rx_queue->notified_count;
}
wmb();
write_ptr = rx_queue->added_count & EFX_RXQ_MASK;
write_ptr = rx_queue->added_count & rx_queue->ptr_mask;
EFX_POPULATE_DWORD_1(reg, FRF_AZ_RX_DESC_WPTR_DWORD, write_ptr);
efx_writed_page(rx_queue->efx, &reg, FR_AZ_RX_DESC_UPD_DWORD_P0,
efx_writed_page(efx, &reg, FR_AZ_RX_DESC_UPD_DWORD_P0,
efx_rx_queue_index(rx_queue));
}
int efx_nic_probe_rx(struct efx_rx_queue *rx_queue)
{
struct efx_nic *efx = rx_queue->efx;
BUILD_BUG_ON(EFX_RXQ_SIZE < 512 || EFX_RXQ_SIZE > 4096 ||
EFX_RXQ_SIZE & EFX_RXQ_MASK);
unsigned entries;
entries = rx_queue->ptr_mask + 1;
return efx_alloc_special_buffer(efx, &rx_queue->rxd,
EFX_RXQ_SIZE * sizeof(efx_qword_t));
entries * sizeof(efx_qword_t));
}
void efx_nic_init_rx(struct efx_rx_queue *rx_queue)
@ -685,7 +688,7 @@ efx_handle_tx_event(struct efx_channel *channel, efx_qword_t *event)
tx_queue = efx_channel_get_tx_queue(
channel, tx_ev_q_label % EFX_TXQ_TYPES);
tx_packets = ((tx_ev_desc_ptr - tx_queue->read_count) &
EFX_TXQ_MASK);
tx_queue->ptr_mask);
channel->irq_mod_score += tx_packets;
efx_xmit_done(tx_queue, tx_ev_desc_ptr);
} else if (EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_WQ_FF_FULL)) {
@ -796,8 +799,8 @@ efx_handle_rx_bad_index(struct efx_rx_queue *rx_queue, unsigned index)
struct efx_nic *efx = rx_queue->efx;
unsigned expected, dropped;
expected = rx_queue->removed_count & EFX_RXQ_MASK;
dropped = (index - expected) & EFX_RXQ_MASK;
expected = rx_queue->removed_count & rx_queue->ptr_mask;
dropped = (index - expected) & rx_queue->ptr_mask;
netif_info(efx, rx_err, efx->net_dev,
"dropped %d events (index=%d expected=%d)\n",
dropped, index, expected);
@ -835,7 +838,7 @@ efx_handle_rx_event(struct efx_channel *channel, const efx_qword_t *event)
rx_queue = efx_channel_get_rx_queue(channel);
rx_ev_desc_ptr = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_DESC_PTR);
expected_ptr = rx_queue->removed_count & EFX_RXQ_MASK;
expected_ptr = rx_queue->removed_count & rx_queue->ptr_mask;
if (unlikely(rx_ev_desc_ptr != expected_ptr))
efx_handle_rx_bad_index(rx_queue, rx_ev_desc_ptr);
@ -1002,6 +1005,7 @@ efx_handle_driver_event(struct efx_channel *channel, efx_qword_t *event)
int efx_nic_process_eventq(struct efx_channel *channel, int budget)
{
struct efx_nic *efx = channel->efx;
unsigned int read_ptr;
efx_qword_t event, *p_event;
int ev_code;
@ -1026,7 +1030,7 @@ int efx_nic_process_eventq(struct efx_channel *channel, int budget)
EFX_SET_QWORD(*p_event);
/* Increment read pointer */
read_ptr = (read_ptr + 1) & EFX_EVQ_MASK;
read_ptr = (read_ptr + 1) & channel->eventq_mask;
ev_code = EFX_QWORD_FIELD(event, FSF_AZ_EV_CODE);
@ -1038,7 +1042,7 @@ int efx_nic_process_eventq(struct efx_channel *channel, int budget)
break;
case FSE_AZ_EV_CODE_TX_EV:
tx_packets += efx_handle_tx_event(channel, &event);
if (tx_packets >= EFX_TXQ_SIZE) {
if (tx_packets > efx->txq_entries) {
spent = budget;
goto out;
}
@ -1073,10 +1077,11 @@ out:
int efx_nic_probe_eventq(struct efx_channel *channel)
{
struct efx_nic *efx = channel->efx;
BUILD_BUG_ON(EFX_EVQ_SIZE < 512 || EFX_EVQ_SIZE > 32768 ||
EFX_EVQ_SIZE & EFX_EVQ_MASK);
unsigned entries;
entries = channel->eventq_mask + 1;
return efx_alloc_special_buffer(efx, &channel->eventq,
EFX_EVQ_SIZE * sizeof(efx_qword_t));
entries * sizeof(efx_qword_t));
}
void efx_nic_init_eventq(struct efx_channel *channel)
@ -1172,7 +1177,7 @@ static void efx_poll_flush_events(struct efx_nic *efx)
struct efx_tx_queue *tx_queue;
struct efx_rx_queue *rx_queue;
unsigned int read_ptr = channel->eventq_read_ptr;
unsigned int end_ptr = (read_ptr - 1) & EFX_EVQ_MASK;
unsigned int end_ptr = (read_ptr - 1) & channel->eventq_mask;
do {
efx_qword_t *event = efx_event(channel, read_ptr);
@ -1212,7 +1217,7 @@ static void efx_poll_flush_events(struct efx_nic *efx)
* it's ok to throw away every non-flush event */
EFX_SET_QWORD(*event);
read_ptr = (read_ptr + 1) & EFX_EVQ_MASK;
read_ptr = (read_ptr + 1) & channel->eventq_mask;
} while (read_ptr != end_ptr);
channel->eventq_read_ptr = read_ptr;

33
drivers/net/sfc/rx.c
View File

@ -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);
}

2
drivers/net/sfc/selftest.c
View File

@ -506,7 +506,7 @@ efx_test_loopback(struct efx_tx_queue *tx_queue,
for (i = 0; i < 3; i++) {
/* Determine how many packets to send */
state->packet_count = EFX_TXQ_SIZE / 3;
state->packet_count = efx->txq_entries / 3;
state->packet_count = min(1 << (i << 2), state->packet_count);
state->skbs = kzalloc(sizeof(state->skbs[0]) *
state->packet_count, GFP_KERNEL);

56
drivers/net/sfc/tx.c
View File

@ -28,7 +28,7 @@
* The tx_queue descriptor ring fill-level must fall below this value
* before we restart the netif queue
*/
#define EFX_TXQ_THRESHOLD (EFX_TXQ_MASK / 2u)
#define EFX_TXQ_THRESHOLD(_efx) ((_efx)->txq_entries / 2u)
/* We need to be able to nest calls to netif_tx_stop_queue(), partly
* because of the 2 hardware queues associated with each core queue,
@ -207,7 +207,7 @@ netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
}
fill_level = tx_queue->insert_count - tx_queue->old_read_count;
q_space = EFX_TXQ_MASK - 1 - fill_level;
q_space = efx->txq_entries - 1 - fill_level;
/* Map for DMA. Use pci_map_single rather than pci_map_page
* since this is more efficient on machines with sparse
@ -244,14 +244,14 @@ netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
&tx_queue->read_count;
fill_level = (tx_queue->insert_count
- tx_queue->old_read_count);
q_space = EFX_TXQ_MASK - 1 - fill_level;
q_space = efx->txq_entries - 1 - fill_level;
if (unlikely(q_space-- <= 0))
goto stop;
smp_mb();
--tx_queue->stopped;
}
insert_ptr = tx_queue->insert_count & EFX_TXQ_MASK;
insert_ptr = tx_queue->insert_count & tx_queue->ptr_mask;
buffer = &tx_queue->buffer[insert_ptr];
efx_tsoh_free(tx_queue, buffer);
EFX_BUG_ON_PARANOID(buffer->tsoh);
@ -320,7 +320,7 @@ netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
/* Work backwards until we hit the original insert pointer value */
while (tx_queue->insert_count != tx_queue->write_count) {
--tx_queue->insert_count;
insert_ptr = tx_queue->insert_count & EFX_TXQ_MASK;
insert_ptr = tx_queue->insert_count & tx_queue->ptr_mask;
buffer = &tx_queue->buffer[insert_ptr];
efx_dequeue_buffer(tx_queue, buffer);
buffer->len = 0;
@ -350,8 +350,8 @@ static void efx_dequeue_buffers(struct efx_tx_queue *tx_queue,
struct efx_nic *efx = tx_queue->efx;
unsigned int stop_index, read_ptr;
stop_index = (index + 1) & EFX_TXQ_MASK;
read_ptr = tx_queue->read_count & EFX_TXQ_MASK;
stop_index = (index + 1) & tx_queue->ptr_mask;
read_ptr = tx_queue->read_count & tx_queue->ptr_mask;
while (read_ptr != stop_index) {
struct efx_tx_buffer *buffer = &tx_queue->buffer[read_ptr];
@ -368,7 +368,7 @@ static void efx_dequeue_buffers(struct efx_tx_queue *tx_queue,
buffer->len = 0;
++tx_queue->read_count;
read_ptr = tx_queue->read_count & EFX_TXQ_MASK;
read_ptr = tx_queue->read_count & tx_queue->ptr_mask;
}
}
@ -402,7 +402,7 @@ void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index)
unsigned fill_level;
struct efx_nic *efx = tx_queue->efx;
EFX_BUG_ON_PARANOID(index > EFX_TXQ_MASK);
EFX_BUG_ON_PARANOID(index > tx_queue->ptr_mask);
efx_dequeue_buffers(tx_queue, index);
@ -412,7 +412,7 @@ void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index)
smp_mb();
if (unlikely(tx_queue->stopped) && likely(efx->port_enabled)) {
fill_level = tx_queue->insert_count - tx_queue->read_count;
if (fill_level < EFX_TXQ_THRESHOLD) {
if (fill_level < EFX_TXQ_THRESHOLD(efx)) {
EFX_BUG_ON_PARANOID(!efx_dev_registered(efx));
/* Do this under netif_tx_lock(), to avoid racing
@ -430,18 +430,24 @@ void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index)
int efx_probe_tx_queue(struct efx_tx_queue *tx_queue)
{
struct efx_nic *efx = tx_queue->efx;
unsigned int txq_size;
unsigned int entries;
int i, rc;
netif_dbg(efx, probe, efx->net_dev, "creating TX queue %d\n",
tx_queue->queue);
/* Create the smallest power-of-two aligned ring */
entries = max(roundup_pow_of_two(efx->txq_entries), EFX_MIN_DMAQ_SIZE);
EFX_BUG_ON_PARANOID(entries > EFX_MAX_DMAQ_SIZE);
tx_queue->ptr_mask = entries - 1;
netif_dbg(efx, probe, efx->net_dev,
"creating TX queue %d size %#x mask %#x\n",
tx_queue->queue, efx->txq_entries, tx_queue->ptr_mask);
/* Allocate software ring */
txq_size = EFX_TXQ_SIZE * sizeof(*tx_queue->buffer);
tx_queue->buffer = kzalloc(txq_size, GFP_KERNEL);
tx_queue->buffer = kzalloc(entries * sizeof(*tx_queue->buffer),
GFP_KERNEL);
if (!tx_queue->buffer)
return -ENOMEM;
for (i = 0; i <= EFX_TXQ_MASK; ++i)
for (i = 0; i <= tx_queue->ptr_mask; ++i)
tx_queue->buffer[i].continuation = true;
/* Allocate hardware ring */
@ -481,7 +487,7 @@ void efx_release_tx_buffers(struct efx_tx_queue *tx_queue)
/* Free any buffers left in the ring */
while (tx_queue->read_count != tx_queue->write_count) {
buffer = &tx_queue->buffer[tx_queue->read_count & EFX_TXQ_MASK];
buffer = &tx_queue->buffer[tx_queue->read_count & tx_queue->ptr_mask];
efx_dequeue_buffer(tx_queue, buffer);
buffer->continuation = true;
buffer->len = 0;
@ -741,7 +747,7 @@ static int efx_tx_queue_insert(struct efx_tx_queue *tx_queue,
fill_level = tx_queue->insert_count - tx_queue->old_read_count;
/* -1 as there is no way to represent all descriptors used */
q_space = EFX_TXQ_MASK - 1 - fill_level;
q_space = efx->txq_entries - 1 - fill_level;
while (1) {
if (unlikely(q_space-- <= 0)) {
@ -757,7 +763,7 @@ static int efx_tx_queue_insert(struct efx_tx_queue *tx_queue,
*(volatile unsigned *)&tx_queue->read_count;
fill_level = (tx_queue->insert_count
- tx_queue->old_read_count);
q_space = EFX_TXQ_MASK - 1 - fill_level;
q_space = efx->txq_entries - 1 - fill_level;
if (unlikely(q_space-- <= 0)) {
*final_buffer = NULL;
return 1;
@ -766,13 +772,13 @@ static int efx_tx_queue_insert(struct efx_tx_queue *tx_queue,
--tx_queue->stopped;
}
insert_ptr = tx_queue->insert_count & EFX_TXQ_MASK;
insert_ptr = tx_queue->insert_count & tx_queue->ptr_mask;
buffer = &tx_queue->buffer[insert_ptr];
++tx_queue->insert_count;
EFX_BUG_ON_PARANOID(tx_queue->insert_count -
tx_queue->read_count >
EFX_TXQ_MASK);
tx_queue->read_count >=
efx->txq_entries);
efx_tsoh_free(tx_queue, buffer);
EFX_BUG_ON_PARANOID(buffer->len);
@ -813,7 +819,7 @@ static void efx_tso_put_header(struct efx_tx_queue *tx_queue,
{
struct efx_tx_buffer *buffer;
buffer = &tx_queue->buffer[tx_queue->insert_count & EFX_TXQ_MASK];
buffer = &tx_queue->buffer[tx_queue->insert_count & tx_queue->ptr_mask];
efx_tsoh_free(tx_queue, buffer);
EFX_BUG_ON_PARANOID(buffer->len);
EFX_BUG_ON_PARANOID(buffer->unmap_len);
@ -838,7 +844,7 @@ static void efx_enqueue_unwind(struct efx_tx_queue *tx_queue)
while (tx_queue->insert_count != tx_queue->write_count) {
--tx_queue->insert_count;
buffer = &tx_queue->buffer[tx_queue->insert_count &
EFX_TXQ_MASK];
tx_queue->ptr_mask];
efx_tsoh_free(tx_queue, buffer);
EFX_BUG_ON_PARANOID(buffer->skb);
if (buffer->unmap_len) {
@ -1168,7 +1174,7 @@ static void efx_fini_tso(struct efx_tx_queue *tx_queue)
unsigned i;
if (tx_queue->buffer) {
for (i = 0; i <= EFX_TXQ_MASK; ++i)
for (i = 0; i <= tx_queue->ptr_mask; ++i)
efx_tsoh_free(tx_queue, &tx_queue->buffer[i]);
}