> Subject: [PATCH 1/1] net/mana: add 32 bit short doorbell
>
> Add 32 bit short doorbell support. Ring short doorbell when running in 32 bit
> applicactions.
>
> Cc: sta...@dpdk.org
>
> Signed-off-by: Wei Hu <w...@microsoft.com>
Please send this patch to
Ferruh Yigit <ferruh.yi...@amd.com>
Andrew Rybchenko <andrew.rybche...@oktetlabs.ru>
> ---
> drivers/net/mana/gdma.c | 95
> +++++++++++++++++++++++++++++++++++++++++
> drivers/net/mana/mana.h | 25 +++++++++++
> drivers/net/mana/rx.c | 52 ++++++++++++++++++++++
> drivers/net/mana/tx.c | 28 ++++++++++++
> 4 files changed, 200 insertions(+)
>
> diff --git a/drivers/net/mana/gdma.c b/drivers/net/mana/gdma.c index
> 65685fe236..d1da025d1b 100644
> --- a/drivers/net/mana/gdma.c
> +++ b/drivers/net/mana/gdma.c
> @@ -166,6 +166,97 @@ gdma_post_work_request(struct
> mana_gdma_queue *queue,
> return 0;
> }
>
> +#ifdef RTE_ARCH_32
> +union gdma_short_doorbell_entry {
> + uint32_t as_uint32;
> +
> + struct {
> + uint32_t tail_ptr_incr : 16; /* Number of CQEs */
> + uint32_t id : 12;
> + uint32_t reserved : 3;
> + uint32_t arm : 1;
> + } cq;
> +
> + struct {
> + uint32_t tail_ptr_incr : 16; /* In number of bytes */
> + uint32_t id : 12;
> + uint32_t reserved : 4;
> + } rq;
> +
> + struct {
> + uint32_t tail_ptr_incr : 16; /* In number of bytes */
> + uint32_t id : 12;
> + uint32_t reserved : 4;
> + } sq;
> +
> + struct {
> + uint32_t tail_ptr_incr : 16; /* Number of EQEs */
> + uint32_t id : 12;
> + uint32_t reserved : 3;
> + uint32_t arm : 1;
> + } eq;
> +}; /* HW DATA */
> +
> +enum {
> + DOORBELL_SHORT_OFFSET_SQ = 0x10,
> + DOORBELL_SHORT_OFFSET_RQ = 0x410,
> + DOORBELL_SHORT_OFFSET_CQ = 0x810,
> + DOORBELL_SHORT_OFFSET_EQ = 0xFF0,
> +};
> +
> +/*
> + * Write to hardware doorbell to notify new activity.
> + */
> +int
> +mana_ring_short_doorbell(void *db_page, enum gdma_queue_types
> queue_type,
> + uint32_t queue_id, uint32_t tail_incr, uint8_t arm) {
> + uint8_t *addr = db_page;
> + union gdma_short_doorbell_entry e = {};
> +
> + if ((queue_id & ~GDMA_SHORT_DB_QID_MASK) ||
> + (tail_incr & ~GDMA_SHORT_DB_INC_MASK)) {
> + DP_LOG(ERR, "%s: queue_id %u or "
> + "tail_incr %u overflowed, queue type %d",
> + __func__, queue_id, tail_incr, queue_type);
This should never happen.
What does "overflowed" mean? Is it a hardware error or software error? If this
is a software error, the calling code needs to make sure it never overflows
when using short doorbells.
Thanks,
Long
