i40e: function to reconfigure RSS queues and rebuild
This is the second of 3 patches that allows for changing
the number of queues in the driver on the fly.
This patch adds a function that calls the reinit flow for the
main VSI after making changes to the RSS queue count as requested
by the user.
Change-Id: I82dee91e9fe90eeb4e84a7369f4b8b342155dd85
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 73110cd..73c9a20 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -5411,15 +5411,18 @@
/* The number of vectors we'll request will be comprised of:
* - Add 1 for "other" cause for Admin Queue events, etc.
* - The number of LAN queue pairs
- * already adjusted for the number of cpus in the system
- * assumes symmetric Tx/Rx pairing
+ * - Queues being used for RSS.
+ * We don't need as many as max_rss_size vectors.
+ * use rss_size instead in the calculation since that
+ * is governed by number of cpus in the system.
+ * - assumes symmetric Tx/Rx pairing
* - The number of VMDq pairs
* Once we count this up, try the request.
*
* If we can't get what we want, we'll simplify to nearly nothing
* and try again. If that still fails, we punt.
*/
- pf->num_lan_msix = pf->num_lan_qps;
+ pf->num_lan_msix = pf->num_lan_qps - (pf->rss_size_max - pf->rss_size);
pf->num_vmdq_msix = pf->num_vmdq_qps;
v_budget = 1 + pf->num_lan_msix;
v_budget += (pf->num_vmdq_vsis * pf->num_vmdq_msix);
@@ -5700,6 +5703,42 @@
}
/**
+ * i40e_reconfig_rss_queues - change number of queues for rss and rebuild
+ * @pf: board private structure
+ * @queue_count: the requested queue count for rss.
+ *
+ * returns 0 if rss is not enabled, if enabled returns the final rss queue
+ * count which may be different from the requested queue count.
+ **/
+int i40e_reconfig_rss_queues(struct i40e_pf *pf, int queue_count)
+{
+ if (!(pf->flags & I40E_FLAG_RSS_ENABLED))
+ return 0;
+
+ queue_count = min_t(int, queue_count, pf->rss_size_max);
+ queue_count = rounddown_pow_of_two(queue_count);
+
+ if (queue_count != pf->rss_size) {
+ if (pf->queues_left < (queue_count - pf->rss_size)) {
+ dev_info(&pf->pdev->dev,
+ "Not enough queues to do RSS on %d queues: remaining queues %d\n",
+ queue_count, pf->queues_left);
+ return pf->rss_size;
+ }
+ i40e_prep_for_reset(pf);
+
+ pf->num_lan_qps += (queue_count - pf->rss_size);
+ pf->queues_left -= (queue_count - pf->rss_size);
+ pf->rss_size = queue_count;
+
+ i40e_reset_and_rebuild(pf, true);
+ i40e_config_rss(pf);
+ }
+ dev_info(&pf->pdev->dev, "RSS count: %d\n", pf->rss_size);
+ return pf->rss_size;
+}
+
+/**
* i40e_sw_init - Initialize general software structures (struct i40e_pf)
* @pf: board private structure to initialize
*
@@ -5880,7 +5919,7 @@
int etherdev_size;
etherdev_size = sizeof(struct i40e_netdev_priv);
- netdev = alloc_etherdev_mq(etherdev_size, vsi->num_queue_pairs);
+ netdev = alloc_etherdev_mq(etherdev_size, vsi->alloc_queue_pairs);
if (!netdev)
return -ENOMEM;
@@ -7180,7 +7219,7 @@
pf->rss_size = i40e_set_rss_size(pf, queues_left);
queues_left -= pf->rss_size;
- pf->num_lan_qps = pf->rss_size;
+ pf->num_lan_qps = pf->rss_size_max;
} else if (pf->flags & I40E_FLAG_RSS_ENABLED &&
!(pf->flags & I40E_FLAG_FDIR_ENABLED) &&
@@ -7199,7 +7238,7 @@
return;
}
- pf->num_lan_qps = pf->rss_size + accum_tc_size;
+ pf->num_lan_qps = pf->rss_size_max + accum_tc_size;
} else if (pf->flags & I40E_FLAG_RSS_ENABLED &&
(pf->flags & I40E_FLAG_FDIR_ENABLED) &&
@@ -7215,7 +7254,7 @@
return;
}
- pf->num_lan_qps = pf->rss_size;
+ pf->num_lan_qps = pf->rss_size_max;
} else if (pf->flags & I40E_FLAG_RSS_ENABLED &&
(pf->flags & I40E_FLAG_FDIR_ENABLED) &&
@@ -7235,7 +7274,7 @@
return;
}
- pf->num_lan_qps = pf->rss_size + accum_tc_size;
+ pf->num_lan_qps = pf->rss_size_max + accum_tc_size;
} else {
dev_info(&pf->pdev->dev,
@@ -7257,6 +7296,7 @@
queues_left -= (pf->num_vmdq_vsis * pf->num_vmdq_qps);
}
+ pf->queues_left = queues_left;
return;
}