igb: increase minimum rx buffer size to 1K

This update increases the minimum rx buffer size to 1K.  The reason for this
change is to support SR-IOV and avoid any conflicts with the rings being able
to set their own MTU sizes.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/igb/igb.h b/drivers/net/igb/igb.h
index d27dcd1..044ba02 100644 (file)
--- a/drivers/net/igb/igb.h
+++ b/drivers/net/igb/igb.h
@@ -96,8 +96,6 @@ struct vf_data_storage {
 
 /* Supported Rx Buffer Sizes */
 #define IGB_RXBUFFER_128   128    /* Used for packet split */
-#define IGB_RXBUFFER_256   256    /* Used for packet split */
-#define IGB_RXBUFFER_512   512
 #define IGB_RXBUFFER_1024  1024
 #define IGB_RXBUFFER_2048  2048
 #define IGB_RXBUFFER_16384 16384

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index e1d1c0c..6146f5d 100644 (file)
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -2233,18 +2233,8 @@ static void igb_setup_rctl(struct igb_adapter *adapter)
                rctl |= E1000_RCTL_LPE;
 
        /* Setup buffer sizes */
-       switch (adapter->rx_buffer_len) {
-       case IGB_RXBUFFER_256:
-               rctl |= E1000_RCTL_SZ_256;
-               break;
-       case IGB_RXBUFFER_512:
-               rctl |= E1000_RCTL_SZ_512;
-               break;
-       default:
-               srrctl = ALIGN(adapter->rx_buffer_len, 1024)
-                        >> E1000_SRRCTL_BSIZEPKT_SHIFT;
-               break;
-       }
+       srrctl = ALIGN(adapter->rx_buffer_len, 1024)
+                >> E1000_SRRCTL_BSIZEPKT_SHIFT;
 
        /* 82575 and greater support packet-split where the protocol
         * header is placed in skb->data and the packet data is
@@ -3755,11 +3745,7 @@ static int igb_change_mtu(struct net_device *netdev, int new_mtu)
         * i.e. RXBUFFER_2048 --> size-4096 slab
         */
 
-       if (max_frame <= IGB_RXBUFFER_256)
-               adapter->rx_buffer_len = IGB_RXBUFFER_256;
-       else if (max_frame <= IGB_RXBUFFER_512)
-               adapter->rx_buffer_len = IGB_RXBUFFER_512;
-       else if (max_frame <= IGB_RXBUFFER_1024)
+       if (max_frame <= IGB_RXBUFFER_1024)
                adapter->rx_buffer_len = IGB_RXBUFFER_1024;
        else if (max_frame <= IGB_RXBUFFER_2048)
                adapter->rx_buffer_len = IGB_RXBUFFER_2048;
@@ -3770,11 +3756,6 @@ static int igb_change_mtu(struct net_device *netdev, int new_mtu)
                adapter->rx_buffer_len = PAGE_SIZE / 2;
 #endif
 
-       /* if sr-iov is enabled we need to force buffer size to 1K or larger */
-       if (adapter->vfs_allocated_count &&
-           (adapter->rx_buffer_len < IGB_RXBUFFER_1024))
-               adapter->rx_buffer_len = IGB_RXBUFFER_1024;
-
        /* adjust allocation if LPE protects us, and we aren't using SBP */
        if ((max_frame == ETH_FRAME_LEN + ETH_FCS_LEN) ||
             (max_frame == MAXIMUM_ETHERNET_VLAN_SIZE))