diff options
| author | Julian Wiedmann <jwi@linux.ibm.com> | 2020-03-25 10:35:04 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-03-25 12:07:15 -0700 |
| commit | ee1e52d1e4bb91826a2bf5c0586d5b15eb619898 (patch) | |
| tree | 0d6e04b5a6a44c4de138bc829fcf554a2553491b /drivers/s390/net/qeth_core.h | |
| parent | 1ab2f8c699d8e91c97f64c9871bcc89c107cdeef (diff) | |
s390/qeth: add TX IRQ coalescing support for IQD devices
Since IQD devices complete (most of) their transmissions synchronously,
they don't offer TX completion IRQs and have no HW coalescing controls.
But we can fake the easy parts in SW, and give the user some control wrt
to how often the TX NAPI code should be triggered to process the TX
completions.
Having per-queue controls can in particular help the dedicated mcast
queue, as it likely benefits from different fine-tuning than what the
ucast queues need.
CC: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/s390/net/qeth_core.h')
| -rw-r--r-- | drivers/s390/net/qeth_core.h | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h index f56670bfcd0a..a6553e78af08 100644 --- a/drivers/s390/net/qeth_core.h +++ b/drivers/s390/net/qeth_core.h @@ -459,6 +459,7 @@ struct qeth_out_q_stats { u64 packing_mode_switch; u64 stopped; u64 doorbell; + u64 coal_frames; u64 completion_yield; u64 completion_timer; @@ -469,6 +470,8 @@ struct qeth_out_q_stats { u64 tx_dropped; }; +#define QETH_TX_MAX_COALESCED_FRAMES 1 +#define QETH_TX_COALESCE_USECS 25 #define QETH_TX_TIMER_USECS 500 struct qeth_qdio_out_q { @@ -492,9 +495,13 @@ struct qeth_qdio_out_q { struct napi_struct napi; struct timer_list timer; struct qeth_hdr *prev_hdr; + unsigned int coalesced_frames; u8 bulk_start; u8 bulk_count; u8 bulk_max; + + unsigned int coalesce_usecs; + unsigned int max_coalesced_frames; }; #define qeth_for_each_output_queue(card, q, i) \ @@ -503,12 +510,10 @@ struct qeth_qdio_out_q { #define qeth_napi_to_out_queue(n) container_of(n, struct qeth_qdio_out_q, napi) -static inline void qeth_tx_arm_timer(struct qeth_qdio_out_q *queue) +static inline void qeth_tx_arm_timer(struct qeth_qdio_out_q *queue, + unsigned long usecs) { - if (timer_pending(&queue->timer)) - return; - mod_timer(&queue->timer, usecs_to_jiffies(QETH_TX_TIMER_USECS) + - jiffies); + timer_reduce(&queue->timer, usecs_to_jiffies(usecs) + jiffies); } static inline bool qeth_out_queue_is_full(struct qeth_qdio_out_q *queue) |