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i40e: avoid divide by zero

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In some weird circumstances with DCB enabled, the firmware can fail to
configure the VSI, leaving us with zero traffic classes. Check for this
state when we configure RSS to avoid a panic.

Signed-off-by: Mitch Williams <mitch.a.williams@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:
Mitch Williams 2017-12-18 05:15:25 -05:00 committed by Jeff Kirsher
parent e3a5d6e6fa
commit b356dac8ab
1 changed files with 7 additions and 2 deletions
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9
drivers/net/ethernet/intel/i40e/i40e_main.c
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@ -10783,8 +10783,13 @@ static int i40e_pf_config_rss(struct i40e_pf *pf)
/* Determine the RSS size of the VSI */
if (!vsi->rss_size) {
u16 qcount;
qcount = vsi->num_queue_pairs / vsi->tc_config.numtc;
/* If the firmware does something weird during VSI init, we
* could end up with zero TCs. Check for that to avoid
* divide-by-zero. It probably won't pass traffic, but it also
* won't panic.
*/
qcount = vsi->num_queue_pairs /
(vsi->tc_config.numtc ? vsi->tc_config.numtc : 1);
vsi->rss_size = min_t(int, pf->alloc_rss_size, qcount);
}
if (!vsi->rss_size)