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qeth: NAPI support for l2 and l3 discipline

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This patch adds NAPI support to the qeth layer 2 and layer 3
discipline. It is important to understand that we can not enable/disable
IRQs as usual, we have to use the corresponding new QDIO interface.
Also to not overdraw the budget we have to stop and restart buffer
processing at any point during processing a bulk of QDIO buffers.
Having the driver NAPI enabled it is possible to turn on GRO for the
layer 3 discipline.

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Frank Blaschka
2010-09-07 21:14:42 +00:00
committed by David S. Miller
parent 81d5374941
commit a1c3ed4c9c
4 changed files with 260 additions and 138 deletions
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26
drivers/s390/net/qeth_core_main.c
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@@ -2911,6 +2911,27 @@ static void qeth_check_outbound_queue(struct qeth_qdio_out_q *queue)
}
}
void qeth_qdio_start_poll(struct ccw_device *ccwdev, int queue,
unsigned long card_ptr)
{
struct qeth_card *card = (struct qeth_card *)card_ptr;
if (card->dev)
napi_schedule(&card->napi);
}
EXPORT_SYMBOL_GPL(qeth_qdio_start_poll);
void qeth_qdio_input_handler(struct ccw_device *ccwdev, unsigned int qdio_err,
unsigned int queue, int first_element, int count,
unsigned long card_ptr)
{
struct qeth_card *card = (struct qeth_card *)card_ptr;
if (qdio_err)
qeth_schedule_recovery(card);
}
EXPORT_SYMBOL_GPL(qeth_qdio_input_handler);
void qeth_qdio_output_handler(struct ccw_device *ccwdev,
unsigned int qdio_error, int __queue, int first_element,
int count, unsigned long card_ptr)
@@ -3843,6 +3864,7 @@ static int qeth_qdio_establish(struct qeth_card *card)
init_data.no_output_qs = card->qdio.no_out_queues;
init_data.input_handler = card->discipline.input_handler;
init_data.output_handler = card->discipline.output_handler;
init_data.queue_start_poll = card->discipline.start_poll;
init_data.int_parm = (unsigned long) card;
init_data.input_sbal_addr_array = (void **) in_sbal_ptrs;
init_data.output_sbal_addr_array = (void **) out_sbal_ptrs;
@@ -4513,8 +4535,8 @@ static struct {
/* 20 */{"queue 1 buffer usage"},
{"queue 2 buffer usage"},
{"queue 3 buffer usage"},
{"rx handler time"},
{"rx handler count"},
{"rx poll time"},
{"rx poll count"},
{"rx do_QDIO time"},
{"rx do_QDIO count"},
{"tx handler time"},