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sfc: Introduce inline functions to simplify TX insertion

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Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings 2013-06-28 21:47:15 +01:00
parent 306a27825c
commit 0fe5565b64
1 changed files with 33 additions and 20 deletions
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53
drivers/net/ethernet/sfc/tx.c
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@ -33,6 +33,31 @@ unsigned int efx_piobuf_size __read_mostly = EFX_PIOBUF_SIZE_DEF;
#endif /* EFX_USE_PIO */
static inline unsigned int
efx_tx_queue_get_insert_index(const struct efx_tx_queue *tx_queue)
{
return tx_queue->insert_count & tx_queue->ptr_mask;
}
static inline struct efx_tx_buffer *
__efx_tx_queue_get_insert_buffer(const struct efx_tx_queue *tx_queue)
{
return &tx_queue->buffer[efx_tx_queue_get_insert_index(tx_queue)];
}
static inline struct efx_tx_buffer *
efx_tx_queue_get_insert_buffer(const struct efx_tx_queue *tx_queue)
{
struct efx_tx_buffer *buffer =
__efx_tx_queue_get_insert_buffer(tx_queue);
EFX_BUG_ON_PARANOID(buffer->len);
EFX_BUG_ON_PARANOID(buffer->flags);
EFX_BUG_ON_PARANOID(buffer->unmap_len);
return buffer;
}
static void efx_dequeue_buffer(struct efx_tx_queue *tx_queue,
struct efx_tx_buffer *buffer,
unsigned int *pkts_compl,
@ -180,7 +205,7 @@ netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
struct device *dma_dev = &efx->pci_dev->dev;
struct efx_tx_buffer *buffer;
skb_frag_t *fragment;
unsigned int len, unmap_len = 0, insert_ptr;
unsigned int len, unmap_len = 0;
dma_addr_t dma_addr, unmap_addr = 0;
unsigned int dma_len;
unsigned short dma_flags;
@ -221,11 +246,7 @@ netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
/* Add to TX queue, splitting across DMA boundaries */
do {
insert_ptr = tx_queue->insert_count & tx_queue->ptr_mask;
buffer = &tx_queue->buffer[insert_ptr];
EFX_BUG_ON_PARANOID(buffer->flags);
EFX_BUG_ON_PARANOID(buffer->len);
EFX_BUG_ON_PARANOID(buffer->unmap_len);
buffer = efx_tx_queue_get_insert_buffer(tx_queue);
dma_len = efx_max_tx_len(efx, dma_addr);
if (likely(dma_len >= len))
@ -283,8 +304,7 @@ netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
while (tx_queue->insert_count != tx_queue->write_count) {
unsigned int pkts_compl = 0, bytes_compl = 0;
--tx_queue->insert_count;
insert_ptr = tx_queue->insert_count & tx_queue->ptr_mask;
buffer = &tx_queue->buffer[insert_ptr];
buffer = __efx_tx_queue_get_insert_buffer(tx_queue);
efx_dequeue_buffer(tx_queue, buffer, &pkts_compl, &bytes_compl);
}
@ -755,23 +775,18 @@ static void efx_tx_queue_insert(struct efx_tx_queue *tx_queue,
{
struct efx_tx_buffer *buffer;
struct efx_nic *efx = tx_queue->efx;
unsigned dma_len, insert_ptr;
unsigned dma_len;
EFX_BUG_ON_PARANOID(len <= 0);
while (1) {
insert_ptr = tx_queue->insert_count & tx_queue->ptr_mask;
buffer = &tx_queue->buffer[insert_ptr];
buffer = efx_tx_queue_get_insert_buffer(tx_queue);
++tx_queue->insert_count;
EFX_BUG_ON_PARANOID(tx_queue->insert_count -
tx_queue->read_count >=
efx->txq_entries);
EFX_BUG_ON_PARANOID(buffer->len);
EFX_BUG_ON_PARANOID(buffer->unmap_len);
EFX_BUG_ON_PARANOID(buffer->flags);
buffer->dma_addr = dma_addr;
dma_len = efx_max_tx_len(efx, dma_addr);
@ -832,8 +847,7 @@ static void efx_enqueue_unwind(struct efx_tx_queue *tx_queue)
/* Work backwards until we hit the original insert pointer value */
while (tx_queue->insert_count != tx_queue->write_count) {
--tx_queue->insert_count;
buffer = &tx_queue->buffer[tx_queue->insert_count &
tx_queue->ptr_mask];
buffer = __efx_tx_queue_get_insert_buffer(tx_queue);
efx_dequeue_buffer(tx_queue, buffer, NULL, NULL);
}
}
@ -978,7 +992,7 @@ static int tso_start_new_packet(struct efx_tx_queue *tx_queue,
struct tso_state *st)
{
struct efx_tx_buffer *buffer =
&tx_queue->buffer[tx_queue->insert_count & tx_queue->ptr_mask];
efx_tx_queue_get_insert_buffer(tx_queue);
bool is_last = st->out_len <= skb_shinfo(skb)->gso_size;
u8 tcp_flags_clear;
@ -1048,8 +1062,7 @@ static int tso_start_new_packet(struct efx_tx_queue *tx_queue,
/* We mapped the headers in tso_start(). Unmap them
* when the last segment is completed.
*/
buffer = &tx_queue->buffer[tx_queue->insert_count &
tx_queue->ptr_mask];
buffer = efx_tx_queue_get_insert_buffer(tx_queue);
buffer->dma_addr = st->header_dma_addr;
buffer->len = st->header_len;
if (is_last) {