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ionic: batch rx buffer refilling 

We don't need to refill the rx descriptors on every napi
if only a few were handled.  Waiting until we can batch up
a few together will save us a few Rx cycles.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Shannon Nelson 2020-11-12 10:22:04 -08:00 committed by Jakub Kicinski
parent e7e8e087ac
commit a8205ab620
2 changed files with 13 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/net/ethernet/pensando/ionic/ionic_dev.h
View File

@ -12,8 +12,10 @@
#define IONIC_MAX_TX_DESC 8192
#define IONIC_MAX_RX_DESC 16384
#define IONIC_MIN_TXRX_DESC 16
#define IONIC_MIN_TXRX_DESC 64
#define IONIC_DEF_TXRX_DESC 4096
#define IONIC_RX_FILL_THRESHOLD 16
#define IONIC_RX_FILL_DIV 8
#define IONIC_LIFS_MAX 1024
#define IONIC_WATCHDOG_SECS 5
#define IONIC_ITR_COAL_USEC_DEFAULT 64

18
drivers/net/ethernet/pensando/ionic/ionic_txrx.c
View File

@ -392,11 +392,6 @@ void ionic_rx_fill(struct ionic_queue *q)
q->dbval | q->head_idx);
}
static void ionic_rx_fill_cb(void *arg)
{
ionic_rx_fill(arg);
}
void ionic_rx_empty(struct ionic_queue *q)
{
struct ionic_desc_info *desc_info;
@ -480,6 +475,7 @@ int ionic_rx_napi(struct napi_struct *napi, int budget)
struct ionic_cq *cq = napi_to_cq(napi);
struct ionic_dev *idev;
struct ionic_lif *lif;
u16 rx_fill_threshold;
u32 work_done = 0;
u32 flags = 0;
@ -489,7 +485,9 @@ int ionic_rx_napi(struct napi_struct *napi, int budget)
work_done = ionic_cq_service(cq, budget,
ionic_rx_service, NULL, NULL);
if (work_done)
rx_fill_threshold = min_t(u16, IONIC_RX_FILL_THRESHOLD,
cq->num_descs / IONIC_RX_FILL_DIV);
if (work_done && ionic_q_space_avail(cq->bound_q) >= rx_fill_threshold)
ionic_rx_fill(cq->bound_q);
if (work_done < budget && napi_complete_done(napi, work_done)) {
@ -518,6 +516,7 @@ int ionic_txrx_napi(struct napi_struct *napi, int budget)
struct ionic_dev *idev;
struct ionic_lif *lif;
struct ionic_cq *txcq;
u16 rx_fill_threshold;
u32 rx_work_done = 0;
u32 tx_work_done = 0;
u32 flags = 0;
@ -531,8 +530,11 @@ int ionic_txrx_napi(struct napi_struct *napi, int budget)
rx_work_done = ionic_cq_service(rxcq, budget,
ionic_rx_service, NULL, NULL);
if (rx_work_done)
ionic_rx_fill_cb(rxcq->bound_q);
rx_fill_threshold = min_t(u16, IONIC_RX_FILL_THRESHOLD,
rxcq->num_descs / IONIC_RX_FILL_DIV);
if (rx_work_done && ionic_q_space_avail(rxcq->bound_q) >= rx_fill_threshold)
ionic_rx_fill(rxcq->bound_q);
if (rx_work_done < budget && napi_complete_done(napi, rx_work_done)) {
ionic_dim_update(qcq);