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Message-ID: <1284136917.2267.103.camel@achroite.uk.solarflarecom.com>
Date: Fri, 10 Sep 2010 17:41:57 +0100
From: Ben Hutchings <bhutchings@...arflare.com>
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org, linux-net-drivers@...arflare.com
Subject: [PATCH net-next-2.6 08/10] sfc: Allocate each channel separately,
along with its RX and TX queues
This will allow for reallocation of channel structures and rings.
Change module parameter separate_tx_channels to be read-only, since we
now require its value to be constant.
Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
---
drivers/net/sfc/efx.c | 61 +++++++++++++++++++++++------------------
drivers/net/sfc/falcon.c | 14 +++-------
drivers/net/sfc/net_driver.h | 62 +++++++++++++++--------------------------
3 files changed, 61 insertions(+), 76 deletions(-)
diff --git a/drivers/net/sfc/efx.c b/drivers/net/sfc/efx.c
index 3dd71aa..4b42e61 100644
--- a/drivers/net/sfc/efx.c
+++ b/drivers/net/sfc/efx.c
@@ -114,7 +114,7 @@ static struct workqueue_struct *reset_workqueue;
* This is only used in MSI-X interrupt mode
*/
static unsigned int separate_tx_channels;
-module_param(separate_tx_channels, uint, 0644);
+module_param(separate_tx_channels, uint, 0444);
MODULE_PARM_DESC(separate_tx_channels,
"Use separate channels for TX and RX");
@@ -334,6 +334,7 @@ void efx_process_channel_now(struct efx_channel *channel)
{
struct efx_nic *efx = channel->efx;
+ BUG_ON(channel->channel >= efx->n_channels);
BUG_ON(!channel->enabled);
/* Disable interrupts and wait for ISRs to complete */
@@ -1098,26 +1099,32 @@ static void efx_remove_interrupts(struct efx_nic *efx)
efx->legacy_irq = 0;
}
+struct efx_tx_queue *
+efx_get_tx_queue(struct efx_nic *efx, unsigned index, unsigned type)
+{
+ unsigned tx_channel_offset =
+ separate_tx_channels ? efx->n_channels - efx->n_tx_channels : 0;
+ EFX_BUG_ON_PARANOID(index >= efx->n_tx_channels ||
+ type >= EFX_TXQ_TYPES);
+ return &efx->channel[tx_channel_offset + index]->tx_queue[type];
+}
+
static void efx_set_channels(struct efx_nic *efx)
{
struct efx_channel *channel;
struct efx_tx_queue *tx_queue;
- struct efx_rx_queue *rx_queue;
unsigned tx_channel_offset =
separate_tx_channels ? efx->n_channels - efx->n_tx_channels : 0;
+ /* Channel pointers were set in efx_init_struct() but we now
+ * need to clear them for TX queues in any RX-only channels. */
efx_for_each_channel(channel, efx) {
- if (channel->channel - tx_channel_offset < efx->n_tx_channels) {
- channel->tx_queue = &efx->tx_queue[
- (channel->channel - tx_channel_offset) *
- EFX_TXQ_TYPES];
+ if (channel->channel - tx_channel_offset >=
+ efx->n_tx_channels) {
efx_for_each_channel_tx_queue(tx_queue, channel)
- tx_queue->channel = channel;
+ tx_queue->channel = NULL;
}
}
-
- efx_for_each_rx_queue(rx_queue, efx)
- rx_queue->channel = &efx->channel[rx_queue->queue];
}
static int efx_probe_nic(struct efx_nic *efx)
@@ -2044,7 +2051,7 @@ static int efx_init_struct(struct efx_nic *efx, struct efx_nic_type *type,
struct efx_channel *channel;
struct efx_tx_queue *tx_queue;
struct efx_rx_queue *rx_queue;
- int i;
+ int i, j;
/* Initialise common structures */
memset(efx, 0, sizeof(*efx));
@@ -2072,27 +2079,22 @@ static int efx_init_struct(struct efx_nic *efx, struct efx_nic_type *type,
INIT_WORK(&efx->mac_work, efx_mac_work);
for (i = 0; i < EFX_MAX_CHANNELS; i++) {
- channel = &efx->channel[i];
+ efx->channel[i] = kzalloc(sizeof(*channel), GFP_KERNEL);
+ channel = efx->channel[i];
channel->efx = efx;
channel->channel = i;
- channel->work_pending = false;
spin_lock_init(&channel->tx_stop_lock);
atomic_set(&channel->tx_stop_count, 1);
- }
- for (i = 0; i < EFX_MAX_TX_QUEUES; i++) {
- tx_queue = &efx->tx_queue[i];
- tx_queue->efx = efx;
- tx_queue->queue = i;
- tx_queue->buffer = NULL;
- tx_queue->channel = &efx->channel[0]; /* for safety */
- tx_queue->tso_headers_free = NULL;
- }
- for (i = 0; i < EFX_MAX_RX_QUEUES; i++) {
- rx_queue = &efx->rx_queue[i];
+
+ for (j = 0; j < EFX_TXQ_TYPES; j++) {
+ tx_queue = &channel->tx_queue[j];
+ tx_queue->efx = efx;
+ tx_queue->queue = i * EFX_TXQ_TYPES + j;
+ tx_queue->channel = channel;
+ }
+
+ rx_queue = &channel->rx_queue;
rx_queue->efx = efx;
- rx_queue->queue = i;
- rx_queue->channel = &efx->channel[0]; /* for safety */
- rx_queue->buffer = NULL;
setup_timer(&rx_queue->slow_fill, efx_rx_slow_fill,
(unsigned long)rx_queue);
}
@@ -2120,6 +2122,11 @@ static int efx_init_struct(struct efx_nic *efx, struct efx_nic_type *type,
static void efx_fini_struct(struct efx_nic *efx)
{
+ int i;
+
+ for (i = 0; i < EFX_MAX_CHANNELS; i++)
+ kfree(efx->channel[i]);
+
if (efx->workqueue) {
destroy_workqueue(efx->workqueue);
efx->workqueue = NULL;
diff --git a/drivers/net/sfc/falcon.c b/drivers/net/sfc/falcon.c
index 4f9d33f..b4d8efe 100644
--- a/drivers/net/sfc/falcon.c
+++ b/drivers/net/sfc/falcon.c
@@ -159,7 +159,6 @@ irqreturn_t falcon_legacy_interrupt_a1(int irq, void *dev_id)
{
struct efx_nic *efx = dev_id;
efx_oword_t *int_ker = efx->irq_status.addr;
- struct efx_channel *channel;
int syserr;
int queues;
@@ -194,15 +193,10 @@ irqreturn_t falcon_legacy_interrupt_a1(int irq, void *dev_id)
wmb(); /* Ensure the vector is cleared before interrupt ack */
falcon_irq_ack_a1(efx);
- /* Schedule processing of any interrupting queues */
- channel = &efx->channel[0];
- while (queues) {
- if (queues & 0x01)
- efx_schedule_channel(channel);
- channel++;
- queues >>= 1;
- }
-
+ if (queues & 1)
+ efx_schedule_channel(efx_get_channel(efx, 0));
+ if (queues & 2)
+ efx_schedule_channel(efx_get_channel(efx, 1));
return IRQ_HANDLED;
}
/**************************************************************************
diff --git a/drivers/net/sfc/net_driver.h b/drivers/net/sfc/net_driver.h
index eb35375..cfc65f5 100644
--- a/drivers/net/sfc/net_driver.h
+++ b/drivers/net/sfc/net_driver.h
@@ -225,8 +225,6 @@ struct efx_rx_page_state {
/**
* struct efx_rx_queue - An Efx RX queue
* @efx: The associated Efx NIC
- * @queue: DMA queue number
- * @channel: The associated channel
* @buffer: The software buffer ring
* @rxd: The hardware descriptor ring
* @added_count: Number of buffers added to the receive queue.
@@ -250,8 +248,6 @@ struct efx_rx_page_state {
*/
struct efx_rx_queue {
struct efx_nic *efx;
- int queue;
- struct efx_channel *channel;
struct efx_rx_buffer *buffer;
struct efx_special_buffer rxd;
@@ -327,9 +323,10 @@ enum efx_rx_alloc_method {
* @n_rx_frm_trunc: Count of RX_FRM_TRUNC errors
* @n_rx_overlength: Count of RX_OVERLENGTH errors
* @n_skbuff_leaks: Count of skbuffs leaked due to RX overrun
- * @tx_queue: Pointer to first TX queue, or %NULL if not used for TX
+ * @rx_queue: RX queue for this channel
* @tx_stop_count: Core TX queue stop count
* @tx_stop_lock: Core TX queue stop lock
+ * @tx_queue: TX queues for this channel
*/
struct efx_channel {
struct efx_nic *efx;
@@ -366,9 +363,12 @@ struct efx_channel {
struct efx_rx_buffer *rx_pkt;
bool rx_pkt_csummed;
- struct efx_tx_queue *tx_queue;
+ struct efx_rx_queue rx_queue;
+
atomic_t tx_stop_count;
spinlock_t tx_stop_lock;
+
+ struct efx_tx_queue tx_queue[2];
};
enum efx_led_mode {
@@ -724,9 +724,7 @@ struct efx_nic {
enum nic_state state;
enum reset_type reset_pending;
- struct efx_tx_queue tx_queue[EFX_MAX_TX_QUEUES];
- struct efx_rx_queue rx_queue[EFX_MAX_RX_QUEUES];
- struct efx_channel channel[EFX_MAX_CHANNELS];
+ struct efx_channel *channel[EFX_MAX_CHANNELS];
unsigned next_buffer_table;
unsigned n_channels;
@@ -913,34 +911,30 @@ static inline struct efx_channel *
efx_get_channel(struct efx_nic *efx, unsigned index)
{
EFX_BUG_ON_PARANOID(index >= efx->n_channels);
- return &efx->channel[index];
+ return efx->channel[index];
}
/* Iterate over all used channels */
#define efx_for_each_channel(_channel, _efx) \
- for (_channel = &((_efx)->channel[0]); \
- _channel < &((_efx)->channel[(efx)->n_channels]); \
- _channel++)
+ for (_channel = (_efx)->channel[0]; \
+ _channel; \
+ _channel = (_channel->channel + 1 < (_efx)->n_channels) ? \
+ (_efx)->channel[_channel->channel + 1] : NULL)
-static inline struct efx_tx_queue *
-efx_get_tx_queue(struct efx_nic *efx, unsigned index, unsigned type)
-{
- EFX_BUG_ON_PARANOID(index >= efx->n_tx_channels ||
- type >= EFX_TXQ_TYPES);
- return &efx->tx_queue[index * EFX_TXQ_TYPES + type];
-}
+extern struct efx_tx_queue *
+efx_get_tx_queue(struct efx_nic *efx, unsigned index, unsigned type);
static inline struct efx_tx_queue *
efx_channel_get_tx_queue(struct efx_channel *channel, unsigned type)
{
struct efx_tx_queue *tx_queue = channel->tx_queue;
EFX_BUG_ON_PARANOID(type >= EFX_TXQ_TYPES);
- return tx_queue ? tx_queue + type : NULL;
+ return tx_queue->channel ? tx_queue + type : NULL;
}
/* Iterate over all TX queues belonging to a channel */
#define efx_for_each_channel_tx_queue(_tx_queue, _channel) \
- for (_tx_queue = (_channel)->tx_queue; \
+ for (_tx_queue = efx_channel_get_tx_queue(channel, 0); \
_tx_queue && _tx_queue < (_channel)->tx_queue + EFX_TXQ_TYPES; \
_tx_queue++)
@@ -948,41 +942,31 @@ static inline struct efx_rx_queue *
efx_get_rx_queue(struct efx_nic *efx, unsigned index)
{
EFX_BUG_ON_PARANOID(index >= efx->n_rx_channels);
- return &efx->rx_queue[index];
+ return &efx->channel[index]->rx_queue;
}
-/* Iterate over all used RX queues */
-#define efx_for_each_rx_queue(_rx_queue, _efx) \
- for (_rx_queue = &((_efx)->rx_queue[0]); \
- _rx_queue < &((_efx)->rx_queue[(_efx)->n_rx_channels]); \
- _rx_queue++)
-
static inline struct efx_rx_queue *
efx_channel_get_rx_queue(struct efx_channel *channel)
{
- struct efx_rx_queue *rx_queue =
- &channel->efx->rx_queue[channel->channel];
- return rx_queue->channel == channel ? rx_queue : NULL;
+ return channel->channel < channel->efx->n_rx_channels ?
+ &channel->rx_queue : NULL;
}
/* Iterate over all RX queues belonging to a channel */
#define efx_for_each_channel_rx_queue(_rx_queue, _channel) \
- for (_rx_queue = &((_channel)->efx->rx_queue[(_channel)->channel]); \
+ for (_rx_queue = efx_channel_get_rx_queue(channel); \
_rx_queue; \
- _rx_queue = NULL) \
- if (_rx_queue->channel != (_channel)) \
- continue; \
- else
+ _rx_queue = NULL)
static inline struct efx_channel *
efx_rx_queue_channel(struct efx_rx_queue *rx_queue)
{
- return rx_queue->channel;
+ return container_of(rx_queue, struct efx_channel, rx_queue);
}
static inline int efx_rx_queue_index(struct efx_rx_queue *rx_queue)
{
- return rx_queue->queue;
+ return efx_rx_queue_channel(rx_queue)->channel;
}
/* Returns a pointer to the specified receive buffer in the RX
--
1.7.2.1
--
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.
--
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