i40e: add interrupt rate limit verbosity

Due to the resolution of the register controlling interrupt rate
limiting, setting certain values for the interrupt rate limit make it
appear as though the limiting is not completely accurate.  The problem
is that the interrupt rate limit is getting rounded down to the nearest
multiple of 4.  This patch fixes the problem by adding some feedback to
the user as to the actual interrupt rate limit being used when it
differs from the requested limit.  Without this patch setting interrupt
rate limits may appear to behave inaccurately.

Change-ID: I3093cf3f2d437d35a4c4f4bb5af5ce1b85ab21b7
Signed-off-by: Alan Brady <alan.brady@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_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 7500902a612d96347087dde69664f35c1da0c8bb..c4ab3c1ae02a7f3ca24b9d0b1848c18aae41e40e 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -2116,6 +2116,7 @@ static int __i40e_set_coalesce(struct net_device *netdev,
        struct i40e_netdev_priv *np = netdev_priv(netdev);
        struct i40e_vsi *vsi = np->vsi;
        struct i40e_pf *pf = vsi->back;
+       u16 intrl_reg;
        int i;
 
        if (ec->tx_max_coalesced_frames_irq || ec->rx_max_coalesced_frames_irq)
@@ -2127,8 +2128,9 @@ static int __i40e_set_coalesce(struct net_device *netdev,
                return -EINVAL;
        }
 
-       if (ec->rx_coalesce_usecs_high >= INTRL_REG_TO_USEC(I40E_MAX_INTRL)) {
-               netif_info(pf, drv, netdev, "Invalid value, rx-usecs-high range is 0-235\n");
+       if (ec->rx_coalesce_usecs_high > INTRL_REG_TO_USEC(I40E_MAX_INTRL)) {
+               netif_info(pf, drv, netdev, "Invalid value, rx-usecs-high range is 0-%lu\n",
+                          INTRL_REG_TO_USEC(I40E_MAX_INTRL));
                return -EINVAL;
        }
 
@@ -2141,7 +2143,12 @@ static int __i40e_set_coalesce(struct net_device *netdev,
                        return -EINVAL;
        }
 
-       vsi->int_rate_limit = ec->rx_coalesce_usecs_high;
+       intrl_reg = i40e_intrl_usec_to_reg(ec->rx_coalesce_usecs_high);
+       vsi->int_rate_limit = INTRL_REG_TO_USEC(intrl_reg);
+       if (vsi->int_rate_limit != ec->rx_coalesce_usecs_high) {
+               netif_info(pf, drv, netdev, "Interrupt rate limit rounded down to %d\n",
+                          vsi->int_rate_limit);
+       }
 
        if (ec->tx_coalesce_usecs == 0) {
                if (ec->use_adaptive_tx_coalesce)