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sfc: add ability for an RXQ to grant credits on refill

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EF100 hardware streams MAE counter updates to the driver over a dedicated
 RX queue; however, the MCPU is not able to detect when RX buffers have
 been posted to the ring.  Thus, the driver must call
 MC_CMD_MAE_COUNTERS_STREAM_GIVE_CREDITS; this patch adds the
 infrastructure to support that to the core RXQ handling code.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Edward Cree 2022-11-14 13:15:51 +00:00 committed by David S. Miller
parent 5ae0c22634
commit e395153984
3 changed files with 22 additions and 3 deletions
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14
drivers/net/ethernet/sfc/ef100_rx.c
View File

@ -183,24 +183,32 @@ void efx_ef100_ev_rx(struct efx_channel *channel, const efx_qword_t *p_event)
void ef100_rx_write(struct efx_rx_queue *rx_queue)
{
unsigned int notified_count = rx_queue->notified_count;
struct efx_rx_buffer *rx_buf;
unsigned int idx;
efx_qword_t *rxd;
efx_dword_t rxdb;
while (rx_queue->notified_count != rx_queue->added_count) {
idx = rx_queue->notified_count & rx_queue->ptr_mask;
while (notified_count != rx_queue->added_count) {
idx = notified_count & rx_queue->ptr_mask;
rx_buf = efx_rx_buffer(rx_queue, idx);
rxd = efx_rx_desc(rx_queue, idx);
EFX_POPULATE_QWORD_1(*rxd, ESF_GZ_RX_BUF_ADDR, rx_buf->dma_addr);
++rx_queue->notified_count;
++notified_count;
}
if (notified_count == rx_queue->notified_count)
return;
wmb();
EFX_POPULATE_DWORD_1(rxdb, ERF_GZ_RX_RING_PIDX,
rx_queue->added_count & rx_queue->ptr_mask);
efx_writed_page(rx_queue->efx, &rxdb,
ER_GZ_RX_RING_DOORBELL, efx_rx_queue_index(rx_queue));
if (rx_queue->grant_credits)
wmb();
rx_queue->notified_count = notified_count;
if (rx_queue->grant_credits)
schedule_work(&rx_queue->grant_work);
}

8
drivers/net/ethernet/sfc/net_driver.h
View File

@ -363,8 +363,12 @@ struct efx_rx_page_state {
* @refill_enabled: Enable refill whenever fill level is low
* @flush_pending: Set when a RX flush is pending. Has the same lifetime as
* @rxq_flush_pending.
* @grant_credits: Posted RX descriptors need to be granted to the MAE with
* %MC_CMD_MAE_COUNTERS_STREAM_GIVE_CREDITS. For %EFX_EXTRA_CHANNEL_TC,
* and only supported on EF100.
* @added_count: Number of buffers added to the receive queue.
* @notified_count: Number of buffers given to NIC (<= @added_count).
* @granted_count: Number of buffers granted to the MAE (<= @notified_count).
* @removed_count: Number of buffers removed from the receive queue.
* @scatter_n: Used by NIC specific receive code.
* @scatter_len: Used by NIC specific receive code.
@ -385,6 +389,7 @@ struct efx_rx_page_state {
* refill was triggered.
* @recycle_count: RX buffer recycle counter.
* @slow_fill: Timer used to defer efx_nic_generate_fill_event().
* @grant_work: workitem used to grant credits to the MAE if @grant_credits
* @xdp_rxq_info: XDP specific RX queue information.
* @xdp_rxq_info_valid: Is xdp_rxq_info valid data?.
*/
@ -396,9 +401,11 @@ struct efx_rx_queue {
unsigned int ptr_mask;
bool refill_enabled;
bool flush_pending;
bool grant_credits;
unsigned int added_count;
unsigned int notified_count;
unsigned int granted_count;
unsigned int removed_count;
unsigned int scatter_n;
unsigned int scatter_len;
@ -416,6 +423,7 @@ struct efx_rx_queue {
unsigned int recycle_count;
struct timer_list slow_fill;
unsigned int slow_fill_count;
struct work_struct grant_work;
/* Statistics to supplement MAC stats */
unsigned long rx_packets;
struct xdp_rxq_info xdp_rxq_info;

3
drivers/net/ethernet/sfc/rx_common.c
View File

@ -229,6 +229,7 @@ void efx_init_rx_queue(struct efx_rx_queue *rx_queue)
/* Initialise ptr fields */
rx_queue->added_count = 0;
rx_queue->notified_count = 0;
rx_queue->granted_count = 0;
rx_queue->removed_count = 0;
rx_queue->min_fill = -1U;
efx_init_rx_recycle_ring(rx_queue);
@ -281,6 +282,8 @@ void efx_fini_rx_queue(struct efx_rx_queue *rx_queue)
"shutting down RX queue %d\n", efx_rx_queue_index(rx_queue));
del_timer_sync(&rx_queue->slow_fill);
if (rx_queue->grant_credits)
flush_work(&rx_queue->grant_work);
/* Release RX buffers from the current read ptr to the write ptr */
if (rx_queue->buffer) {