i40e: use priv flags to control packet split

Ethtool priv flags implementation to enable or disable packet split, which
is a hardware feature that inspects headers and will put headers in a
separate DMA buffer from the payload data.  The driver was automatically
choosing to enable packet split in some cases and this gives the user the
ability to turn it off/on explicitly.

to query state:
ethtool --show-priv-flags ethx

to enable:
ethtool --set-priv-flags ethx packet-split on
to disable:
ethtool --set-priv-flags ethx packet-split off

Why would anyone want this?
	Because some environments benefit from header/data split in the receive
	buffer, and the driver defaults to one or the other depending on
	environment/kernel parameters.

Why didn't you implement a generic ethtool control for this feature?
	Because Intel hardware is the only hardware that supports header/data
	split.

Change-ID: I803121e1eecc9ccb2884031fd85dd1110b3af66d
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@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 dde7ae7..4ca85d5 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -104,6 +104,7 @@
 #define I40E_PRIV_FLAGS_LINKPOLL_FLAG  BIT(1)
 #define I40E_PRIV_FLAGS_FD_ATR         BIT(2)
 #define I40E_PRIV_FLAGS_VEB_STATS      BIT(3)
+#define I40E_PRIV_FLAGS_PS             BIT(4)
 
 #define I40E_NVM_VERSION_LO_SHIFT  0
 #define I40E_NVM_VERSION_LO_MASK   (0xff << I40E_NVM_VERSION_LO_SHIFT)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index b52c509..29d5833 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -231,6 +231,7 @@ static const char i40e_priv_flags_strings[][ETH_GSTRING_LEN] = {
        "LinkPolling",
        "flow-director-atr",
        "veb-stats",
+       "packet-split",
 };
 
 #define I40E_PRIV_FLAGS_STR_LEN ARRAY_SIZE(i40e_priv_flags_strings)
@@ -2709,6 +2710,8 @@ static u32 i40e_get_priv_flags(struct net_device *dev)
                I40E_PRIV_FLAGS_FD_ATR : 0;
        ret_flags |= pf->flags & I40E_FLAG_VEB_STATS_ENABLED ?
                I40E_PRIV_FLAGS_VEB_STATS : 0;
+       ret_flags |= pf->flags & I40E_FLAG_RX_PS_ENABLED ?
+               I40E_PRIV_FLAGS_PS : 0;
 
        return ret_flags;
 }
@@ -2723,6 +2726,26 @@ static int i40e_set_priv_flags(struct net_device *dev, u32 flags)
        struct i40e_netdev_priv *np = netdev_priv(dev);
        struct i40e_vsi *vsi = np->vsi;
        struct i40e_pf *pf = vsi->back;
+       bool reset_required = false;
+
+       /* NOTE: MFP is not settable */
+
+       /* allow the user to control the method of receive
+        * buffer DMA, whether the packet is split at header
+        * boundaries into two separate buffers.  In some cases
+        * one routine or the other will perform better.
+        */
+       if ((flags & I40E_PRIV_FLAGS_PS) &&
+           !(pf->flags & I40E_FLAG_RX_PS_ENABLED)) {
+               pf->flags |= I40E_FLAG_RX_PS_ENABLED;
+               pf->flags &= ~I40E_FLAG_RX_1BUF_ENABLED;
+               reset_required = true;
+       } else if (!(flags & I40E_PRIV_FLAGS_PS) &&
+                  (pf->flags & I40E_FLAG_RX_PS_ENABLED)) {
+               pf->flags &= ~I40E_FLAG_RX_PS_ENABLED;
+               pf->flags |= I40E_FLAG_RX_1BUF_ENABLED;
+               reset_required = true;
+       }
 
        if (flags & I40E_PRIV_FLAGS_LINKPOLL_FLAG)
                pf->flags |= I40E_FLAG_LINK_POLLING_ENABLED;
@@ -2745,6 +2768,10 @@ static int i40e_set_priv_flags(struct net_device *dev, u32 flags)
        else
                pf->flags &= ~I40E_FLAG_VEB_STATS_ENABLED;
 
+       /* if needed, issue reset to cause things to take effect */
+       if (reset_required)
+               i40e_do_reset(pf, BIT(__I40E_PF_RESET_REQUESTED));
+
        return 0;
 }