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RDMA/bnxt_re: add helper function __poll_for_resp 

This interface will be used if the driver has not enabled interrupt
and/or interrupt is disabled for a short period of time.
Completion is not possible from interrupt so this interface does
self-polling.

Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://lore.kernel.org/r/1686308514-11996-10-git-send-email-selvin.xavier@broadcom.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Kashyap Desai 2023-06-09 04:01:46 -07:00 committed by Leon Romanovsky
parent 159cf95e42
commit 354f5bd985
2 changed files with 44 additions and 1 deletions
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44
drivers/infiniband/hw/bnxt_re/qplib_rcfw.c
View File

@ -260,6 +260,44 @@ static int __send_message(struct bnxt_qplib_rcfw *rcfw,
return 0;
}
/**
* __poll_for_resp - self poll completion for rcfw command
* @rcfw - rcfw channel instance of rdev
* @cookie - cookie to track the command
* @opcode - rcfw submitted for given opcode
*
* It works same as __wait_for_resp except this function will
* do self polling in sort interval since interrupt is disabled.
* This function can not be called from non-sleepable context.
*
* Returns:
* -ETIMEOUT if command is not completed in specific time interval.
* 0 if command is completed by firmware.
*/
static int __poll_for_resp(struct bnxt_qplib_rcfw *rcfw, u16 cookie,
u8 opcode)
{
struct bnxt_qplib_cmdq_ctx *cmdq = &rcfw->cmdq;
unsigned long issue_time;
u16 cbit;
cbit = cookie % rcfw->cmdq_depth;
issue_time = jiffies;
do {
if (test_bit(ERR_DEVICE_DETACHED, &cmdq->flags))
return bnxt_qplib_map_rc(opcode);
usleep_range(1000, 1001);
bnxt_qplib_service_creq(&rcfw->creq.creq_tasklet);
if (!test_bit(cbit, cmdq->cmdq_bitmap))
return 0;
if (jiffies_to_msecs(jiffies - issue_time) > 10000)
return -ETIMEDOUT;
} while (true);
};
static int __send_message_basic_sanity(struct bnxt_qplib_rcfw *rcfw,
struct bnxt_qplib_cmdqmsg *msg)
{
@ -328,8 +366,10 @@ static int __bnxt_qplib_rcfw_send_message(struct bnxt_qplib_rcfw *rcfw,
if (msg->block)
rc = __block_for_resp(rcfw, cookie, opcode);
else
else if (atomic_read(&rcfw->rcfw_intr_enabled))
rc = __wait_for_resp(rcfw, cookie, opcode);
else
rc = __poll_for_resp(rcfw, cookie, opcode);
if (rc) {
/* timed out */
dev_err(&rcfw->pdev->dev, "cmdq[%#x]=%#x timedout (%d)msec\n",
@ -796,6 +836,7 @@ void bnxt_qplib_rcfw_stop_irq(struct bnxt_qplib_rcfw *rcfw, bool kill)
kfree(creq->irq_name);
creq->irq_name = NULL;
creq->requested = false;
atomic_set(&rcfw->rcfw_intr_enabled, 0);
}
void bnxt_qplib_disable_rcfw_channel(struct bnxt_qplib_rcfw *rcfw)
@ -857,6 +898,7 @@ int bnxt_qplib_rcfw_start_irq(struct bnxt_qplib_rcfw *rcfw, int msix_vector,
creq->requested = true;
bnxt_qplib_ring_nq_db(&creq->creq_db.dbinfo, res->cctx, true);
atomic_inc(&rcfw->rcfw_intr_enabled);
return 0;
}

1
drivers/infiniband/hw/bnxt_re/qplib_rcfw.h
View File

@ -221,6 +221,7 @@ struct bnxt_qplib_rcfw {
u64 oos_prev;
u32 init_oos_stats;
u32 cmdq_depth;
atomic_t rcfw_intr_enabled;
struct semaphore rcfw_inflight;
};