Hello!
> -Original Message-
> From: netdev-ow...@vger.kernel.org [mailto:netdev-ow...@vger.kernel.org] On
> Behalf Of Sunil
> Goutham
> Sent: Wednesday, December 09, 2015 2:38 PM
> To: netdev@vger.kernel.org
> Cc: linux-ker...@vger.kernel.org; linux-arm-ker...@lists.infradead.org;
> p.fe...@samsung.com;
> sunil.gout...@caviumnetworks.com; Sunil Goutham
> Subject: [PATCH 2/2] net: thunderx: Enable CQE count threshold interrupt
>
> From: Sunil Goutham
>
> This feature is introduced in pass-2 chip and with this CQ interrupt
> coalescing will work based on both timer and count.
>
> Signed-off-by: Sunil Goutham
> ---
> drivers/net/ethernet/cavium/thunder/nic.h |2 ++
> drivers/net/ethernet/cavium/thunder/nicvf_main.c |2 +-
> drivers/net/ethernet/cavium/thunder/nicvf_queues.c |5 -
> drivers/net/ethernet/cavium/thunder/nicvf_queues.h |3 ++-
> 4 files changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ethernet/cavium/thunder/nic.h
> b/drivers/net/ethernet/cavium/thunder/nic.h
> index 02571f4..e782856 100644
> --- a/drivers/net/ethernet/cavium/thunder/nic.h
> +++ b/drivers/net/ethernet/cavium/thunder/nic.h
> @@ -34,6 +34,8 @@
> /* NIC priv flags */
> #define NIC_SRIOV_ENABLED BIT(0)
>
> +#define VNIC_NAPI_WEIGHTNAPI_POLL_WEIGHT
> +
> /* Min/Max packet size */
> #define NIC_HW_MIN_FRS 64
> #define NIC_HW_MAX_FRS 9200 /* 9216 max packet
> including FCS */
> diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c
> b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
> index c24cb2a..e06a7f8 100644
> --- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c
> +++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
> @@ -1155,7 +1155,7 @@ int nicvf_open(struct net_device *netdev)
> cq_poll->cq_idx = qidx;
> cq_poll->nicvf = nic;
> netif_napi_add(netdev, &cq_poll->napi, nicvf_poll,
> -NAPI_POLL_WEIGHT);
> +VNIC_NAPI_WEIGHT);
What's the sense in introducing another constant which is aliased to the
previous one? Making LOC bigger?
> napi_enable(&cq_poll->napi);
> nic->napi[qidx] = cq_poll;
> }
> diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
> b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
> index b11fc09..4e9709e 100644
> --- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
> +++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
> @@ -299,7 +299,10 @@ static int nicvf_init_cmp_queue(struct nicvf *nic,
> return err;
>
> cq->desc = cq->dmem.base;
> - cq->thresh = CMP_QUEUE_CQE_THRESH;
> + if (!pass1_silicon(nic->pdev))
> + cq->thresh = CMP_QUEUE_CQE_THRESH;
> + else
> + cq->thresh = 0;
IMHO "cq->thresh = pass1_silicon(nic->pdev) ? CMP_QUEUE_CQE_THRESH : 0" looks
less bulky.
> nic->cq_coalesce_usecs = (CMP_QUEUE_TIMER_THRESH * 0.05) - 1;
>
> return 0;
> diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.h
> b/drivers/net/ethernet/cavium/thunder/nicvf_queues.h
> index a4f6667..0fae6ad 100644
> --- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.h
> +++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.h
> @@ -10,6 +10,7 @@
> #define NICVF_QUEUES_H
>
> #include
> +#include "nic.h"
> #include "q_struct.h"
>
> #define MAX_QUEUE_SET128
> @@ -75,7 +76,7 @@
> */
> #define CMP_QSIZECMP_QUEUE_SIZE2
> #define CMP_QUEUE_LEN(1ULL << (CMP_QSIZE + 10))
> -#define CMP_QUEUE_CQE_THRESH 0
> +#define CMP_QUEUE_CQE_THRESH (VNIC_NAPI_WEIGHT / 2)
> #define CMP_QUEUE_TIMER_THRESH 80 /* ~2usec */
>
> #define RBDR_SIZERBDR_SIZE0
> --
> 1.7.1
Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia
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