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.h b/drivers/net/ethernet/intel/i40e/i40e.h
index 001d7cf..eb1a3aa 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -199,6 +199,7 @@ struct i40e_pf {
        u16 num_tc_qps;            /* num queue pairs per TC */
        u16 num_lan_qps;           /* num lan queues this pf has set up */
        u16 num_lan_msix;          /* num queue vectors for the base pf vsi */
+       int queues_left;           /* queues left unclaimed */
        u16 rss_size;              /* num queues in the RSS array */
        u16 rss_size_max;          /* HW defined max RSS queues */
        u16 fdir_pf_filter_count;  /* num of guaranteed filters for this PF */
@@ -530,6 +531,7 @@ struct i40e_vsi *i40e_vsi_setup(struct i40e_pf *pf, u8 type,
 int i40e_vsi_release(struct i40e_vsi *vsi);
 struct i40e_vsi *i40e_vsi_lookup(struct i40e_pf *pf, enum i40e_vsi_type type,
                                 struct i40e_vsi *start_vsi);
+int i40e_reconfig_rss_queues(struct i40e_pf *pf, int queue_count);
 struct i40e_veb *i40e_veb_setup(struct i40e_pf *pf, u16 flags, u16 uplink_seid,
                                u16 downlink_seid, u8 enabled_tc);
 void i40e_veb_release(struct i40e_veb *veb);

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 73110cd..73c9a20 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -5411,15 +5411,18 @@ static int i40e_init_msix(struct i40e_pf *pf)
        /* 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);
@@ -5699,6 +5702,42 @@ static int i40e_config_rss(struct i40e_pf *pf)
        return 0;
 }
 
+/**
+ * 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 @@ static int i40e_config_netdev(struct i40e_vsi *vsi)
        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 @@ static void i40e_determine_queue_usage(struct i40e_pf *pf)
                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 @@ static void i40e_determine_queue_usage(struct i40e_pf *pf)
                        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 @@ static void i40e_determine_queue_usage(struct i40e_pf *pf)
                        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 @@ static void i40e_determine_queue_usage(struct i40e_pf *pf)
                        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 @@ static void i40e_determine_queue_usage(struct i40e_pf *pf)
                queues_left -= (pf->num_vmdq_vsis * pf->num_vmdq_qps);
        }
 
+       pf->queues_left = queues_left;
        return;
 }