fm10k: use ethtool_rxfh_indir_default for default redirection table

The fm10k driver used its own code for generating a default indirection
table on device load, which was not the same as the default generated by
ethtool when indir_size of 0 is passed to SRXFH. Take advantage of
ethtool_rxfh_indir_default() and simplify code to write the redirection
table to reduce some code duplication.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/fm10k/fm10k.h b/drivers/net/ethernet/intel/fm10k/fm10k.h
index 83f3867..9c7fafe 100644 (file)
--- a/drivers/net/ethernet/intel/fm10k/fm10k.h
+++ b/drivers/net/ethernet/intel/fm10k/fm10k.h
@@ -510,6 +510,8 @@ int fm10k_close(struct net_device *netdev);
 
 /* Ethtool */
 void fm10k_set_ethtool_ops(struct net_device *dev);
+u32 fm10k_get_reta_size(struct net_device *netdev);
+void fm10k_write_reta(struct fm10k_intfc *interface, const u32 *indir);
 
 /* IOV */
 s32 fm10k_iov_event(struct fm10k_intfc *interface);

diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c b/drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c
index 2e4ea88..a237487 100644 (file)
--- a/drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c
@@ -1027,11 +1027,31 @@ static int fm10k_set_priv_flags(struct net_device *netdev, u32 priv_flags)
        return 0;
 }
 
-static u32 fm10k_get_reta_size(struct net_device __always_unused *netdev)
+u32 fm10k_get_reta_size(struct net_device __always_unused *netdev)
 {
        return FM10K_RETA_SIZE * FM10K_RETA_ENTRIES_PER_REG;
 }
 
+void fm10k_write_reta(struct fm10k_intfc *interface, const u32 *indir)
+{
+       struct fm10k_hw *hw = &interface->hw;
+       int i;
+
+       /* record entries to reta table */
+       for (i = 0; i < FM10K_RETA_SIZE; i++, indir += 4) {
+               u32 reta = indir[0] |
+                          (indir[1] << 8) |
+                          (indir[2] << 16) |
+                          (indir[3] << 24);
+
+               if (interface->reta[i] == reta)
+                       continue;
+
+               interface->reta[i] = reta;
+               fm10k_write_reg(hw, FM10K_RETA(0, i), reta);
+       }
+}
+
 static int fm10k_get_reta(struct net_device *netdev, u32 *indir)
 {
        struct fm10k_intfc *interface = netdev_priv(netdev);
@@ -1055,7 +1075,6 @@ static int fm10k_get_reta(struct net_device *netdev, u32 *indir)
 static int fm10k_set_reta(struct net_device *netdev, const u32 *indir)
 {
        struct fm10k_intfc *interface = netdev_priv(netdev);
-       struct fm10k_hw *hw = &interface->hw;
        int i;
        u16 rss_i;
 
@@ -1070,19 +1089,7 @@ static int fm10k_set_reta(struct net_device *netdev, const u32 *indir)
                return -EINVAL;
        }
 
-       /* record entries to reta table */
-       for (i = 0; i < FM10K_RETA_SIZE; i++, indir += 4) {
-               u32 reta = indir[0] |
-                          (indir[1] << 8) |
-                          (indir[2] << 16) |
-                          (indir[3] << 24);
-
-               if (interface->reta[i] == reta)
-                       continue;
-
-               interface->reta[i] = reta;
-               fm10k_write_reg(hw, FM10K_RETA(0, i), reta);
-       }
+       fm10k_write_reta(interface, indir);
 
        return 0;
 }

diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_main.c b/drivers/net/ethernet/intel/fm10k/fm10k_main.c
index 31179af..0b46539 100644 (file)
--- a/drivers/net/ethernet/intel/fm10k/fm10k_main.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_main.c
@@ -1943,7 +1943,8 @@ static void fm10k_assign_rings(struct fm10k_intfc *interface)
 static void fm10k_init_reta(struct fm10k_intfc *interface)
 {
        u16 i, rss_i = interface->ring_feature[RING_F_RSS].indices;
-       u32 reta, base;
+       struct net_device *netdev = interface->netdev;
+       u32 reta, *indir;
 
        /* If the Rx flow indirection table has been configured manually, we
         * need to maintain it when possible.
@@ -1968,21 +1969,16 @@ static void fm10k_init_reta(struct fm10k_intfc *interface)
        }
 
 repopulate_reta:
-       /* Populate the redirection table 4 entries at a time.  To do this
-        * we are generating the results for n and n+2 and then interleaving
-        * those with the results with n+1 and n+3.
-        */
-       for (i = FM10K_RETA_SIZE; i--;) {
-               /* first pass generates n and n+2 */
-               base = ((i * 0x00040004) + 0x00020000) * rss_i;
-               reta = (base & 0x3F803F80) >> 7;
+       indir = kcalloc(fm10k_get_reta_size(netdev),
+                       sizeof(indir[0]), GFP_KERNEL);
 
-               /* second pass generates n+1 and n+3 */
-               base += 0x00010001 * rss_i;
-               reta |= (base & 0x3F803F80) << 1;
+       /* generate redirection table using the default kernel policy */
+       for (i = 0; i < fm10k_get_reta_size(netdev); i++)
+               indir[i] = ethtool_rxfh_indir_default(i, rss_i);
 
-               interface->reta[i] = reta;
-       }
+       fm10k_write_reta(interface, indir);
+
+       kfree(indir);
 }
 
 /**