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When negotiating MSIX parameters, give other head time to see our

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NTB_MSIX_RECEIVED status, before making upper layers overwrite it.

This is not completely perfect, but now it works better then before.

MFC after:	2 weeks
Sponsored by:	iXsystems, Inc.
This commit is contained in:
mav 2016-06-04 00:08:37 +00:00
parent 356a290b3d
commit a0753989c6
1 changed files with 10 additions and 3 deletions
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13
sys/dev/ntb/ntb_hw/ntb_hw.c
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@ -2801,6 +2801,8 @@ ntb_exchange_msix(void *ctx)
ntb = ctx;
if (ntb->peer_msix_good)
goto msix_good;
if (ntb->peer_msix_done)
goto msix_done;
@ -2832,16 +2834,21 @@ msix_done:
goto reschedule;
ntb->peer_msix_good = true;
/* Give peer time to see our NTB_MSIX_RECEIVED. */
goto reschedule;
msix_good:
ntb_poll_link(ntb);
ntb_link_event(ntb);
return;
reschedule:
ntb->lnk_sta = pci_read_config(ntb->device, ntb->reg->lnk_sta, 2);
if (_xeon_link_is_up(ntb))
callout_reset(&ntb->peer_msix_work, hz / 100, ntb_exchange_msix, ntb);
else
if (_xeon_link_is_up(ntb)) {
callout_reset(&ntb->peer_msix_work,
hz * (ntb->peer_msix_good ? 2 : 1) / 100,
ntb_exchange_msix, ntb);
} else
ntb_spad_clear(ntb);
}