i40e: Fix descriptor count manipulation

Changing descriptor count via 'ethtool -G' is not persistent across resets.
When PF reset occurs, we roll back to the default value of vsi->num_desc,
which is used then in i40e_alloc_rings to set descriptor count. XDP does a
PF reset so when user has changed the descriptor count and load XDP
program, the default count will be back there.

To fix this:
  * introduce new VSI members - num_tx_desc and num_rx_desc in favour of
    num_desc
  * set them in i40e_set_ringparam to user's values
  * set them to default values in i40e_set_num_rings_in_vsi only when they
    don't have previous values

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@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 8dc98d1..24e6ce6 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -775,7 +775,8 @@ struct i40e_vsi {
        u16 alloc_queue_pairs;  /* Allocated Tx/Rx queues */
        u16 req_queue_pairs;    /* User requested queue pairs */
        u16 num_queue_pairs;    /* Used tx and rx pairs */
-       u16 num_desc;
+       u16 num_tx_desc;
+       u16 num_rx_desc;
        enum i40e_vsi_type type;  /* VSI type, e.g., LAN, FCoE, etc */
        s16 vf_id;              /* Virtual function ID for SRIOV VSIs */
 

diff --git a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
index dc5b400..55d20ac 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
@@ -333,8 +333,9 @@ static void i40e_dbg_dump_vsi_seid(struct i40e_pf *pf, int seid)
                 "    seid = %d, id = %d, uplink_seid = %d\n",
                 vsi->seid, vsi->id, vsi->uplink_seid);
        dev_info(&pf->pdev->dev,
-                "    base_queue = %d, num_queue_pairs = %d, num_desc = %d\n",
-                vsi->base_queue, vsi->num_queue_pairs, vsi->num_desc);
+                "    base_queue = %d, num_queue_pairs = %d, num_tx_desc = %d, num_rx_desc = %d\n",
+                vsi->base_queue, vsi->num_queue_pairs, vsi->num_tx_desc,
+                vsi->num_rx_desc);
        dev_info(&pf->pdev->dev, "    type = %i\n", vsi->type);
        if (vsi->type == I40E_VSI_SRIOV)
                dev_info(&pf->pdev->dev, "    VF ID = %i\n", vsi->vf_id);

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index a6c5e10..527eb52 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -1982,6 +1982,8 @@ static int i40e_set_ringparam(struct net_device *netdev,
                        if (i40e_enabled_xdp_vsi(vsi))
                                vsi->xdp_rings[i]->count = new_tx_count;
                }
+               vsi->num_tx_desc = new_tx_count;
+               vsi->num_rx_desc = new_rx_count;
                goto done;
        }
 
@@ -2118,6 +2120,8 @@ rx_unwind:
                rx_rings = NULL;
        }
 
+       vsi->num_tx_desc = new_tx_count;
+       vsi->num_rx_desc = new_rx_count;
        i40e_up(vsi);
 
 free_tx:

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 6a10f9f..ff1525e 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -10078,8 +10078,12 @@ static int i40e_set_num_rings_in_vsi(struct i40e_vsi *vsi)
        switch (vsi->type) {
        case I40E_VSI_MAIN:
                vsi->alloc_queue_pairs = pf->num_lan_qps;
-               vsi->num_desc = ALIGN(I40E_DEFAULT_NUM_DESCRIPTORS,
-                                     I40E_REQ_DESCRIPTOR_MULTIPLE);
+               if (!vsi->num_tx_desc)
+                       vsi->num_tx_desc = ALIGN(I40E_DEFAULT_NUM_DESCRIPTORS,
+                                                I40E_REQ_DESCRIPTOR_MULTIPLE);
+               if (!vsi->num_rx_desc)
+                       vsi->num_rx_desc = ALIGN(I40E_DEFAULT_NUM_DESCRIPTORS,
+                                                I40E_REQ_DESCRIPTOR_MULTIPLE);
                if (pf->flags & I40E_FLAG_MSIX_ENABLED)
                        vsi->num_q_vectors = pf->num_lan_msix;
                else
@@ -10089,22 +10093,32 @@ static int i40e_set_num_rings_in_vsi(struct i40e_vsi *vsi)
 
        case I40E_VSI_FDIR:
                vsi->alloc_queue_pairs = 1;
-               vsi->num_desc = ALIGN(I40E_FDIR_RING_COUNT,
-                                     I40E_REQ_DESCRIPTOR_MULTIPLE);
+               vsi->num_tx_desc = ALIGN(I40E_FDIR_RING_COUNT,
+                                        I40E_REQ_DESCRIPTOR_MULTIPLE);
+               vsi->num_rx_desc = ALIGN(I40E_FDIR_RING_COUNT,
+                                        I40E_REQ_DESCRIPTOR_MULTIPLE);
                vsi->num_q_vectors = pf->num_fdsb_msix;
                break;
 
        case I40E_VSI_VMDQ2:
                vsi->alloc_queue_pairs = pf->num_vmdq_qps;
-               vsi->num_desc = ALIGN(I40E_DEFAULT_NUM_DESCRIPTORS,
-                                     I40E_REQ_DESCRIPTOR_MULTIPLE);
+               if (!vsi->num_tx_desc)
+                       vsi->num_tx_desc = ALIGN(I40E_DEFAULT_NUM_DESCRIPTORS,
+                                                I40E_REQ_DESCRIPTOR_MULTIPLE);
+               if (!vsi->num_rx_desc)
+                       vsi->num_rx_desc = ALIGN(I40E_DEFAULT_NUM_DESCRIPTORS,
+                                                I40E_REQ_DESCRIPTOR_MULTIPLE);
                vsi->num_q_vectors = pf->num_vmdq_msix;
                break;
 
        case I40E_VSI_SRIOV:
                vsi->alloc_queue_pairs = pf->num_vf_qps;
-               vsi->num_desc = ALIGN(I40E_DEFAULT_NUM_DESCRIPTORS,
-                                     I40E_REQ_DESCRIPTOR_MULTIPLE);
+               if (!vsi->num_tx_desc)
+                       vsi->num_tx_desc = ALIGN(I40E_DEFAULT_NUM_DESCRIPTORS,
+                                                I40E_REQ_DESCRIPTOR_MULTIPLE);
+               if (!vsi->num_rx_desc)
+                       vsi->num_rx_desc = ALIGN(I40E_DEFAULT_NUM_DESCRIPTORS,
+                                                I40E_REQ_DESCRIPTOR_MULTIPLE);
                break;
 
        default:
@@ -10380,7 +10394,7 @@ static int i40e_alloc_rings(struct i40e_vsi *vsi)
                ring->vsi = vsi;
                ring->netdev = vsi->netdev;
                ring->dev = &pf->pdev->dev;
-               ring->count = vsi->num_desc;
+               ring->count = vsi->num_tx_desc;
                ring->size = 0;
                ring->dcb_tc = 0;
                if (vsi->back->hw_features & I40E_HW_WB_ON_ITR_CAPABLE)
@@ -10397,7 +10411,7 @@ static int i40e_alloc_rings(struct i40e_vsi *vsi)
                ring->vsi = vsi;
                ring->netdev = NULL;
                ring->dev = &pf->pdev->dev;
-               ring->count = vsi->num_desc;
+               ring->count = vsi->num_tx_desc;
                ring->size = 0;
                ring->dcb_tc = 0;
                if (vsi->back->hw_features & I40E_HW_WB_ON_ITR_CAPABLE)
@@ -10413,7 +10427,7 @@ setup_rx:
                ring->vsi = vsi;
                ring->netdev = vsi->netdev;
                ring->dev = &pf->pdev->dev;
-               ring->count = vsi->num_desc;
+               ring->count = vsi->num_rx_desc;
                ring->size = 0;
                ring->dcb_tc = 0;
                ring->itr_setting = pf->rx_itr_default;