diff options
| author |   Sunil Goutham <sgoutham@cavium.com> | 2016-11-24 14:48:02 +0530 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2016-11-25 20:21:17 -0500 |
| commit | d5b2d7a7184062c436f9a2b237e77bdb8e06a936 (patch) | |
| tree | 15bb59d54a2694cc96e6542108609838e69b42a6 /drivers/net/ethernet/cavium/thunder/nicvf_queues.h | |
| parent | net: thunderx: Add ethtool support for supported ports and link modes. (diff) | |
| download | linux-dev-d5b2d7a7184062c436f9a2b237e77bdb8e06a936.tar.xz linux-dev-d5b2d7a7184062c436f9a2b237e77bdb8e06a936.zip | |
net: thunderx: Configure RED and backpressure levels
This patch enables moving average calculation of Rx pkt's resources
and configures RED and backpressure levels for both CQ and RBDR.
Also initialize SQ's CQ_LIMIT properly.
Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/cavium/thunder/nicvf_queues.h')
| -rw-r--r-- | drivers/net/ethernet/cavium/thunder/nicvf_queues.h | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.h b/drivers/net/ethernet/cavium/thunder/nicvf_queues.h index 2e3c940c1093..20511f2cb134 100644 --- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.h +++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.h @@ -85,12 +85,26 @@ #define MAX_CQES_FOR_TX ((SND_QUEUE_LEN / MIN_SQ_DESC_PER_PKT_XMIT) * \ MAX_CQE_PER_PKT_XMIT) -/* Calculate number of CQEs to reserve for all SQEs. - * Its 1/256th level of CQ size. - * '+ 1' to account for pipelining + +/* RED and Backpressure levels of CQ for pkt reception + * For CQ, level is a measure of emptiness i.e 0x0 means full + * eg: For CQ of size 4K, and for pass/drop levels of 128/96 + * HW accepts pkt if unused CQE >= 2048 + * RED accepts pkt if unused CQE < 2048 & >= 1536 + * DROPs pkts if unused CQE < 1536 + */ +#define RQ_PASS_CQ_LVL 128ULL +#define RQ_DROP_CQ_LVL 96ULL + +/* RED and Backpressure levels of RBDR for pkt reception + * For RBDR, level is a measure of fullness i.e 0x0 means empty + * eg: For RBDR of size 8K, and for pass/drop levels of 4/0 + * HW accepts pkt if unused RBs >= 256 + * RED accepts pkt if unused RBs < 256 & >= 0 + * DROPs pkts if unused RBs < 0 */ -#define RQ_CQ_DROP ((256 / (CMP_QUEUE_LEN / \ - (CMP_QUEUE_LEN - MAX_CQES_FOR_TX))) + 1) +#define RQ_PASS_RBDR_LVL 8ULL +#define RQ_DROP_RBDR_LVL 0ULL /* Descriptor size in bytes */ #define SND_QUEUE_DESC_SIZE 16 |