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i40e: Do not allow use more TC queue pairs than MSI-X vectors exist

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This patch suppresses the message about invalid TC mapping and wrong
selected TX queue. The root cause of this bug was setting too many
TC queue pairs on huge multiprocessor machines. When quantity of the
TC queue pairs is exceeding MSI-X vectors count then TX queue number
can be selected beyond actual TX queues amount.

Signed-off-by: Paweł Jabłoński <pawel.jablonski@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Paweł Jabłoński 2017-12-29 08:49:10 -05:00 committed by Jeff Kirsher
parent a3f9fb5ef3
commit 1563f2d2e0
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ethernet/intel/i40e/i40e_main.c
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@ -1818,6 +1818,10 @@ static void i40e_vsi_setup_queue_map(struct i40e_vsi *vsi,
num_tc_qps = qcount / numtc;
num_tc_qps = min_t(int, num_tc_qps, i40e_pf_get_max_q_per_tc(pf));
/* Do not allow use more TC queue pairs than MSI-X vectors exist */
if (pf->flags & I40E_FLAG_MSIX_ENABLED)
num_tc_qps = min_t(int, num_tc_qps, pf->num_lan_msix);
/* Setup queue offset/count for all TCs for given VSI */
for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++) {
/* See if the given TC is enabled for the given VSI */