igb: move rx_buffer_len into the ring structure

This patch moves the rx_buffer_len value into the ring structure.  This allows
greater flexibility and the option of doing things such as supporting packet
split only on some queues, or enabling virtualization.

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>

2 files changed, 23 insertions, 21 deletions

diff --git a/drivers/net/igb/igb.h b/drivers/net/igb/igb.h
index de268620dd92..00ff274b16db 100644
--- a/drivers/net/igb/igb.h
+++ b/drivers/net/igb/igb.h
@@ -198,7 +198,7 @@ struct igb_ring {
                 /* RX */
                 struct {
                         struct igb_rx_queue_stats rx_stats;
-                        u64 rx_queue_drops;
+                        u32 rx_buffer_len;
                 };
         };
 };
@@ -218,7 +218,6 @@ struct igb_adapter {
         struct vlan_group *vlgrp;
         u16 mng_vlan_id;
         u32 bd_number;
-        u32 rx_buffer_len;
         u32 wol;
         u32 en_mng_pt;
         u16 link_speed;
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index ff16b7ac0d1e..04e860d4e080 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -443,6 +443,7 @@ static int igb_alloc_queues(struct igb_adapter *adapter)
                 ring->count = adapter->rx_ring_count;
                 ring->queue_index = i;
                 ring->pdev = adapter->pdev;
+                ring->rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;
         }
 
         igb_cache_ring_register(adapter);
@@ -1863,7 +1864,6 @@ static int __devinit igb_sw_init(struct igb_adapter *adapter)
 
         adapter->tx_ring_count = IGB_DEFAULT_TXD;
         adapter->rx_ring_count = IGB_DEFAULT_RXD;
-        adapter->rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;
         adapter->max_frame_size = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
         adapter->min_frame_size = ETH_ZLEN + ETH_FCS_LEN;
 
@@ -2358,8 +2358,8 @@ static void igb_configure_rx_ring(struct igb_adapter *adapter,
         writel(0, ring->tail);
 
         /* set descriptor configuration */
-        if (adapter->rx_buffer_len < IGB_RXBUFFER_1024) {
-                srrctl = ALIGN(adapter->rx_buffer_len, 64) <<
+        if (ring->rx_buffer_len < IGB_RXBUFFER_1024) {
+                srrctl = ALIGN(ring->rx_buffer_len, 64) <<
                          E1000_SRRCTL_BSIZEHDRSIZE_SHIFT;
 #if (PAGE_SIZE / 2) > IGB_RXBUFFER_16384
                 srrctl |= IGB_RXBUFFER_16384 >>
@@ -2370,7 +2370,7 @@ static void igb_configure_rx_ring(struct igb_adapter *adapter,
 #endif
                 srrctl |= E1000_SRRCTL_DESCTYPE_HDR_SPLIT_ALWAYS;
         } else {
-                srrctl = ALIGN(adapter->rx_buffer_len, 1024) >>
+                srrctl = ALIGN(ring->rx_buffer_len, 1024) >>
                          E1000_SRRCTL_BSIZEPKT_SHIFT;
                 srrctl |= E1000_SRRCTL_DESCTYPE_ADV_ONEBUF;
         }
@@ -2619,7 +2619,6 @@ static void igb_free_all_rx_resources(struct igb_adapter *adapter)
  **/
 static void igb_clean_rx_ring(struct igb_ring *rx_ring)
 {
-        struct igb_adapter *adapter = rx_ring->q_vector->adapter;
         struct igb_buffer *buffer_info;
         unsigned long size;
         unsigned int i;
@@ -2632,7 +2631,7 @@ static void igb_clean_rx_ring(struct igb_ring *rx_ring)
                 if (buffer_info->dma) {
                         pci_unmap_single(rx_ring->pdev,
                                          buffer_info->dma,
-                                         adapter->rx_buffer_len,
+                                         rx_ring->rx_buffer_len,
                                          PCI_DMA_FROMDEVICE);
                         buffer_info->dma = 0;
                 }
@@ -3746,6 +3745,7 @@ static int igb_change_mtu(struct net_device *netdev, int new_mtu)
 {
         struct igb_adapter *adapter = netdev_priv(netdev);
         int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;
+        u32 rx_buffer_len, i;
 
         if ((max_frame < ETH_ZLEN + ETH_FCS_LEN) ||
             (max_frame > MAX_JUMBO_FRAME_SIZE)) {
@@ -3763,9 +3763,6 @@ static int igb_change_mtu(struct net_device *netdev, int new_mtu)
 
         /* igb_down has a dependency on max_frame_size */
         adapter->max_frame_size = max_frame;
-        if (netif_running(netdev))
-                igb_down(adapter);
-
         /* NOTE: netdev_alloc_skb reserves 16 bytes, and typically NET_IP_ALIGN
          * means we reserve 2 more, this pushes us to allocate from the next
          * larger slab size.
@@ -3773,16 +3770,22 @@ static int igb_change_mtu(struct net_device *netdev, int new_mtu)
          */
 
         if (max_frame <= IGB_RXBUFFER_1024)
-                adapter->rx_buffer_len = IGB_RXBUFFER_1024;
+                rx_buffer_len = IGB_RXBUFFER_1024;
         else if (max_frame <= MAXIMUM_ETHERNET_VLAN_SIZE)
-                adapter->rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;
+                rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;
         else
-                adapter->rx_buffer_len = IGB_RXBUFFER_128;
+                rx_buffer_len = IGB_RXBUFFER_128;
+
+        if (netif_running(netdev))
+                igb_down(adapter);
 
         dev_info(&adapter->pdev->dev, "changing MTU from %d to %d\n",
                  netdev->mtu, new_mtu);
         netdev->mtu = new_mtu;
 
+        for (i = 0; i < adapter->num_rx_queues; i++)
+                adapter->rx_ring[i].rx_buffer_len = rx_buffer_len;
+
         if (netif_running(netdev))
                 igb_up(adapter);
         else
@@ -4828,7 +4831,7 @@ static inline void igb_rx_checksum_adv(struct igb_adapter *adapter,
         dev_dbg(&adapter->pdev->dev, "cksum success: bits %08X\n", status_err);
 }
 
-static inline u16 igb_get_hlen(struct igb_adapter *adapter,
+static inline u16 igb_get_hlen(struct igb_ring *rx_ring,
                                union e1000_adv_rx_desc *rx_desc)
 {
         /* HW will not DMA in data larger than the given buffer, even if it
@@ -4837,8 +4840,8 @@ static inline u16 igb_get_hlen(struct igb_adapter *adapter,
          */
         u16 hlen = (le16_to_cpu(rx_desc->wb.lower.lo_dword.hdr_info) &
                    E1000_RXDADV_HDRBUFLEN_MASK) >> E1000_RXDADV_HDRBUFLEN_SHIFT;
-        if (hlen > adapter->rx_buffer_len)
-                hlen = adapter->rx_buffer_len;
+        if (hlen > rx_ring->rx_buffer_len)
+                hlen = rx_ring->rx_buffer_len;
         return hlen;
 }
 
@@ -4888,14 +4891,14 @@ static bool igb_clean_rx_irq_adv(struct igb_q_vector *q_vector,
 
                 if (buffer_info->dma) {
                         pci_unmap_single(pdev, buffer_info->dma,
-                                         adapter->rx_buffer_len,
+                                         rx_ring->rx_buffer_len,
                                          PCI_DMA_FROMDEVICE);
                         buffer_info->dma = 0;
-                        if (adapter->rx_buffer_len >= IGB_RXBUFFER_1024) {
+                        if (rx_ring->rx_buffer_len >= IGB_RXBUFFER_1024) {
                                 skb_put(skb, length);
                                 goto send_up;
                         }
-                        skb_put(skb, igb_get_hlen(adapter, rx_desc));
+                        skb_put(skb, igb_get_hlen(rx_ring, rx_desc));
                 }
 
                 if (length) {
@@ -5034,7 +5037,7 @@ static void igb_alloc_rx_buffers_adv(struct igb_ring *rx_ring,
         i = rx_ring->next_to_use;
         buffer_info = &rx_ring->buffer_info[i];
 
-        bufsz = adapter->rx_buffer_len;
+        bufsz = rx_ring->rx_buffer_len;
 
         while (cleaned_count--) {
                 rx_desc = E1000_RX_DESC_ADV(*rx_ring, i);