[PATCH] myri10ge: drop contiguous skb routines

Drop the old routines that used the physically contigous skb now
that we use the physical pages. And rename myri10ge_page_rx_done()
to myri10ge_rx_done() as it was previously.

Signed-off-by: Brice Goglin <brice@myri.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 8 insertions, 204 deletions

diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
index 4d2be9c59164..711a8bf08fac 100644
--- a/drivers/net/myri10ge/myri10ge.c
+++ b/drivers/net/myri10ge/myri10ge.c
@@ -97,7 +97,6 @@ MODULE_LICENSE("Dual BSD/GPL");
 #define MYRI10GE_MAX_FRAGS_PER_FRAME (MYRI10GE_MAX_ETHER_MTU/MYRI10GE_ALLOC_SIZE + 1)
 
 struct myri10ge_rx_buffer_state {
-        struct sk_buff *skb;
         struct page *page;
         int page_offset;
          DECLARE_PCI_UNMAP_ADDR(bus)
@@ -250,11 +249,6 @@ module_param(myri10ge_force_firmware, int, S_IRUGO);
 MODULE_PARM_DESC(myri10ge_force_firmware,
                  "Force firmware to assume aligned completions\n");
 
-static int myri10ge_skb_cross_4k = 0;
-module_param(myri10ge_skb_cross_4k, int, S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(myri10ge_skb_cross_4k,
-                 "Can a small skb cross a 4KB boundary?\n");
-
 static int myri10ge_initial_mtu = MYRI10GE_MAX_ETHER_MTU - ETH_HLEN;
 module_param(myri10ge_initial_mtu, int, S_IRUGO);
 MODULE_PARM_DESC(myri10ge_initial_mtu, "Initial MTU\n");
@@ -820,148 +814,6 @@ myri10ge_submit_8rx(struct mcp_kreq_ether_recv __iomem * dst,
         mb();
 }
 
-/*
- * Set of routines to get a new receive buffer.  Any buffer which
- * crosses a 4KB boundary must start on a 4KB boundary due to PCIe
- * wdma restrictions. We also try to align any smaller allocation to
- * at least a 16 byte boundary for efficiency.  We assume the linux
- * memory allocator works by powers of 2, and will not return memory
- * smaller than 2KB which crosses a 4KB boundary.  If it does, we fall
- * back to allocating 2x as much space as required.
- *
- * We intend to replace large (>4KB) skb allocations by using
- * pages directly and building a fraglist in the near future.
- */
-
-static inline struct sk_buff *myri10ge_alloc_big(struct net_device *dev,
-                                                 int bytes)
-{
-        struct sk_buff *skb;
-        unsigned long data, roundup;
-
-        skb = netdev_alloc_skb(dev, bytes + 4096 + MXGEFW_PAD);
-        if (skb == NULL)
-                return NULL;
-
-        /* Correct skb->truesize so that socket buffer
-         * accounting is not confused the rounding we must
-         * do to satisfy alignment constraints.
-         */
-        skb->truesize -= 4096;
-
-        data = (unsigned long)(skb->data);
-        roundup = (-data) & (4095);
-        skb_reserve(skb, roundup);
-        return skb;
-}
-
-/* Allocate 2x as much space as required and use whichever portion
- * does not cross a 4KB boundary */
-static inline struct sk_buff *myri10ge_alloc_small_safe(struct net_device *dev,
-                                                        unsigned int bytes)
-{
-        struct sk_buff *skb;
-        unsigned long data, boundary;
-
-        skb = netdev_alloc_skb(dev, 2 * (bytes + MXGEFW_PAD) - 1);
-        if (unlikely(skb == NULL))
-                return NULL;
-
-        /* Correct skb->truesize so that socket buffer
-         * accounting is not confused the rounding we must
-         * do to satisfy alignment constraints.
-         */
-        skb->truesize -= bytes + MXGEFW_PAD;
-
-        data = (unsigned long)(skb->data);
-        boundary = (data + 4095UL) & ~4095UL;
-        if ((boundary - data) >= (bytes + MXGEFW_PAD))
-                return skb;
-
-        skb_reserve(skb, boundary - data);
-        return skb;
-}
-
-/* Allocate just enough space, and verify that the allocated
- * space does not cross a 4KB boundary */
-static inline struct sk_buff *myri10ge_alloc_small(struct net_device *dev,
-                                                   int bytes)
-{
-        struct sk_buff *skb;
-        unsigned long roundup, data, end;
-
-        skb = netdev_alloc_skb(dev, bytes + 16 + MXGEFW_PAD);
-        if (unlikely(skb == NULL))
-                return NULL;
-
-        /* Round allocated buffer to 16 byte boundary */
-        data = (unsigned long)(skb->data);
-        roundup = (-data) & 15UL;
-        skb_reserve(skb, roundup);
-        /* Verify that the data buffer does not cross a page boundary */
-        data = (unsigned long)(skb->data);
-        end = data + bytes + MXGEFW_PAD - 1;
-        if (unlikely(((end >> 12) != (data >> 12)) && (data & 4095UL))) {
-                printk(KERN_NOTICE
-                       "myri10ge_alloc_small: small skb crossed 4KB boundary\n");
-                myri10ge_skb_cross_4k = 1;
-                dev_kfree_skb_any(skb);
-                skb = myri10ge_alloc_small_safe(dev, bytes);
-        }
-        return skb;
-}
-
-static inline int
-myri10ge_getbuf(struct myri10ge_rx_buf *rx, struct myri10ge_priv *mgp,
-                int bytes, int idx)
-{
-        struct net_device *dev = mgp->dev;
-        struct pci_dev *pdev = mgp->pdev;
-        struct sk_buff *skb;
-        dma_addr_t bus;
-        int len, retval = 0;
-
-        bytes += VLAN_HLEN;     /* account for 802.1q vlan tag */
-
-        if ((bytes + MXGEFW_PAD) > (4096 - 16) /* linux overhead */ )
-                skb = myri10ge_alloc_big(dev, bytes);
-        else if (myri10ge_skb_cross_4k)
-                skb = myri10ge_alloc_small_safe(dev, bytes);
-        else
-                skb = myri10ge_alloc_small(dev, bytes);
-
-        if (unlikely(skb == NULL)) {
-                rx->alloc_fail++;
-                retval = -ENOBUFS;
-                goto done;
-        }
-
-        /* set len so that it only covers the area we
-         * need mapped for DMA */
-        len = bytes + MXGEFW_PAD;
-
-        bus = pci_map_single(pdev, skb->data, len, PCI_DMA_FROMDEVICE);
-        rx->info[idx].skb = skb;
-        pci_unmap_addr_set(&rx->info[idx], bus, bus);
-        pci_unmap_len_set(&rx->info[idx], len, len);
-        rx->shadow[idx].addr_low = htonl(MYRI10GE_LOWPART_TO_U32(bus));
-        rx->shadow[idx].addr_high = htonl(MYRI10GE_HIGHPART_TO_U32(bus));
-
-done:
-        /* copy 8 descriptors (64-bytes) to the mcp at a time */
-        if ((idx & 7) == 7) {
-                if (rx->wc_fifo == NULL)
-                        myri10ge_submit_8rx(&rx->lanai[idx - 7],
-                                            &rx->shadow[idx - 7]);
-                else {
-                        mb();
-                        myri10ge_pio_copy(rx->wc_fifo,
-                                          &rx->shadow[idx - 7], 64);
-                }
-        }
-        return retval;
-}
-
 static inline void myri10ge_vlan_ip_csum(struct sk_buff *skb, __wsum hw_csum)
 {
         struct vlan_hdr *vh = (struct vlan_hdr *)(skb->data);
@@ -1084,8 +936,8 @@ myri10ge_unmap_rx_page(struct pci_dev *pdev,
                                  * page into an skb */
 
 static inline int
-myri10ge_page_rx_done(struct myri10ge_priv *mgp, struct myri10ge_rx_buf *rx,
-                      int bytes, int len, __wsum csum)
+myri10ge_rx_done(struct myri10ge_priv *mgp, struct myri10ge_rx_buf *rx,
+                 int bytes, int len, __wsum csum)
 {
         struct sk_buff *skb;
         struct skb_frag_struct rx_frags[MYRI10GE_MAX_FRAGS_PER_FRAME];
@@ -1148,54 +1000,6 @@ myri10ge_page_rx_done(struct myri10ge_priv *mgp, struct myri10ge_rx_buf *rx,
         return 1;
 }
 
-static inline unsigned long
-myri10ge_rx_done(struct myri10ge_priv *mgp, struct myri10ge_rx_buf *rx,
-                 int bytes, int len, __wsum csum)
-{
-        dma_addr_t bus;
-        struct sk_buff *skb;
-        int idx, unmap_len;
-
-        idx = rx->cnt & rx->mask;
-        rx->cnt++;
-
-        /* save a pointer to the received skb */
-        skb = rx->info[idx].skb;
-        bus = pci_unmap_addr(&rx->info[idx], bus);
-        unmap_len = pci_unmap_len(&rx->info[idx], len);
-
-        /* try to replace the received skb */
-        if (myri10ge_getbuf(rx, mgp, bytes, idx)) {
-                /* drop the frame -- the old skbuf is re-cycled */
-                mgp->stats.rx_dropped += 1;
-                return 0;
-        }
-
-        /* unmap the recvd skb */
-        pci_unmap_single(mgp->pdev, bus, unmap_len, PCI_DMA_FROMDEVICE);
-
-        /* mcp implicitly skips 1st bytes so that packet is properly
-         * aligned */
-        skb_reserve(skb, MXGEFW_PAD);
-
-        /* set the length of the frame */
-        skb_put(skb, len);
-
-        skb->protocol = eth_type_trans(skb, mgp->dev);
-        if (mgp->csum_flag) {
-                if ((skb->protocol == htons(ETH_P_IP)) ||
-                    (skb->protocol == htons(ETH_P_IPV6))) {
-                        skb->csum = csum;
-                        skb->ip_summed = CHECKSUM_COMPLETE;
-                } else
-                        myri10ge_vlan_ip_csum(skb, csum);
-        }
-
-        netif_receive_skb(skb);
-        mgp->dev->last_rx = jiffies;
-        return 1;
-}
-
 static inline void myri10ge_tx_done(struct myri10ge_priv *mgp, int mcp_index)
 {
         struct pci_dev *pdev = mgp->pdev;
@@ -1264,13 +1068,13 @@ static inline void myri10ge_clean_rx_done(struct myri10ge_priv *mgp, int *limit)
                 rx_done->entry[idx].length = 0;
                 checksum = csum_unfold(rx_done->entry[idx].checksum);
                 if (length <= mgp->small_bytes)
-                        rx_ok = myri10ge_page_rx_done(mgp, &mgp->rx_small,
-                                                      mgp->small_bytes,
-                                                      length, checksum);
+                        rx_ok = myri10ge_rx_done(mgp, &mgp->rx_small,
+                                                 mgp->small_bytes,
+                                                 length, checksum);
                 else
-                        rx_ok = myri10ge_page_rx_done(mgp, &mgp->rx_big,
-                                                      mgp->big_bytes,
-                                                      length, checksum);
+                        rx_ok = myri10ge_rx_done(mgp, &mgp->rx_big,
+                                                 mgp->big_bytes,
+                                                 length, checksum);
                 rx_packets += rx_ok;
                 rx_bytes += rx_ok * (unsigned long)length;
                 cnt++;