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Check for number of MSI-x upon partial allocation in ENA

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The ENA driver needs at least 2 MSI-x - one for admin queue, and one for
IO queues pair. If there were not enough resources to allocate more than
one MSI-x, the device should not be attached.

Submitted by:  Michal Krawczyk <mk@semihalf.com>
Obtained from: Semihalf
Sponsored by:  Amazon, Inc.
This commit is contained in:
Marcin Wojtas 2019-05-30 13:22:12 +00:00
parent 469a84079c
commit 2b5b60fe0d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=348397
1 changed files with 8 additions and 0 deletions
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8
sys/dev/ena/ena.c
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@ -1865,6 +1865,14 @@ ena_enable_msix(struct ena_adapter *adapter)
}
if (msix_vecs != msix_req) {
if (msix_vecs == ENA_ADMIN_MSIX_VEC) {
device_printf(dev,
"Not enough number of MSI-x allocated: %d\n",
msix_vecs);
pci_release_msi(dev);
rc = ENOSPC;
goto err_msix_free;
}
device_printf(dev, "Enable only %d MSI-x (out of %d), reduce "
"the number of queues\n", msix_vecs, msix_req);
adapter->num_queues = msix_vecs - ENA_ADMIN_MSIX_VEC;