From e395153984871e33624ce5e3f72038de979f5b3e Mon Sep 17 00:00:00 2001 From: Edward Cree Date: Mon, 14 Nov 2022 13:15:51 +0000 Subject: [PATCH] sfc: add ability for an RXQ to grant credits on refill 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 Signed-off-by: David S. Miller --- drivers/net/ethernet/sfc/ef100_rx.c | 14 +++++++++++--- drivers/net/ethernet/sfc/net_driver.h | 8 ++++++++ drivers/net/ethernet/sfc/rx_common.c | 3 +++ 3 files changed, 22 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/sfc/ef100_rx.c b/drivers/net/ethernet/sfc/ef100_rx.c index 0721260..735f503 100644 --- a/drivers/net/ethernet/sfc/ef100_rx.c +++ b/drivers/net/ethernet/sfc/ef100_rx.c @@ -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); } diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h index 7ef823d..efb867b 100644 --- a/drivers/net/ethernet/sfc/net_driver.h +++ b/drivers/net/ethernet/sfc/net_driver.h @@ -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; diff --git a/drivers/net/ethernet/sfc/rx_common.c b/drivers/net/ethernet/sfc/rx_common.c index 9220afe..d2f35ee 100644 --- a/drivers/net/ethernet/sfc/rx_common.c +++ b/drivers/net/ethernet/sfc/rx_common.c @@ -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) { -- 2.7.4