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i40e: check if vectors are already depleted when doing VMDq allocation

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During MSI-X vector allocation for VMDq, a check for "no vectors left"
was missing, add it. This prevents more vectors to be allocated than
available.

Signed-off-by: Stefan Assmann <sassmann@kpanic.de>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Stefan Assmann 2016-09-19 13:37:49 +02:00 committed by Jeff Kirsher
parent b9118b7221
commit 9ca57e97a7
1 changed files with 16 additions and 11 deletions
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27
drivers/net/ethernet/intel/i40e/i40e_main.c
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@ -7674,18 +7674,23 @@ static int i40e_init_msix(struct i40e_pf *pf)
int vmdq_vecs_wanted = pf->num_vmdq_vsis * pf->num_vmdq_qps;
int vmdq_vecs = min_t(int, vectors_left, vmdq_vecs_wanted);
/* if we're short on vectors for what's desired, we limit
* the queues per vmdq. If this is still more than are
* available, the user will need to change the number of
* queues/vectors used by the PF later with the ethtool
* channels command
*/
if (vmdq_vecs < vmdq_vecs_wanted)
pf->num_vmdq_qps = 1;
pf->num_vmdq_msix = pf->num_vmdq_qps;
if (!vectors_left) {
pf->num_vmdq_msix = 0;
pf->num_vmdq_qps = 0;
} else {
/* if we're short on vectors for what's desired, we limit
* the queues per vmdq. If this is still more than are
* available, the user will need to change the number of
* queues/vectors used by the PF later with the ethtool
* channels command
*/
if (vmdq_vecs < vmdq_vecs_wanted)
pf->num_vmdq_qps = 1;
pf->num_vmdq_msix = pf->num_vmdq_qps;
v_budget += vmdq_vecs;
vectors_left -= vmdq_vecs;
v_budget += vmdq_vecs;
vectors_left -= vmdq_vecs;
}
}
pf->msix_entries = kcalloc(v_budget, sizeof(struct msix_entry),