Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1e6e9342d41ff80ced0ad5dfcf084926700cdfc5
Commit:     1e6e9342d41ff80ced0ad5dfcf084926700cdfc5
Parent:     d4dc4ec9d84e0578b9bfbe56a11fafdb7cbac771
Author:     Andrew Gallatin <[EMAIL PROTECTED]>
AuthorDate: Mon Sep 17 11:37:42 2007 -0700
Committer:  David S. Miller <[EMAIL PROTECTED]>
CommitDate: Wed Oct 10 16:47:47 2007 -0700

    [MYRI10GE]: Use LRO.
    
    Singed off by: Andrew Gallatin <[EMAIL PROTECTED]>
    Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
 drivers/net/Kconfig             |    1 +
 drivers/net/myri10ge/myri10ge.c |  109 ++++++++++++++++++++++++++++++++++++++-
 2 files changed, 109 insertions(+), 1 deletions(-)

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 61dedfe..40ff9a5 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -2583,6 +2583,7 @@ config MYRI10GE
        depends on PCI
        select FW_LOADER
        select CRC32
+       select INET_LRO
        ---help---
          This driver supports Myricom Myri-10G Dual Protocol interface in
          Ethernet mode. If the eeprom on your board is not recent enough,
diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
index a30146e..48b23c5 100644
--- a/drivers/net/myri10ge/myri10ge.c
+++ b/drivers/net/myri10ge/myri10ge.c
@@ -48,6 +48,7 @@
 #include <linux/etherdevice.h>
 #include <linux/if_ether.h>
 #include <linux/if_vlan.h>
+#include <linux/inet_lro.h>
 #include <linux/ip.h>
 #include <linux/inet.h>
 #include <linux/in.h>
@@ -62,6 +63,8 @@
 #include <linux/io.h>
 #include <linux/log2.h>
 #include <net/checksum.h>
+#include <net/ip.h>
+#include <net/tcp.h>
 #include <asm/byteorder.h>
 #include <asm/io.h>
 #include <asm/processor.h>
@@ -89,6 +92,8 @@ MODULE_LICENSE("Dual BSD/GPL");
 
 #define MYRI10GE_EEPROM_STRINGS_SIZE 256
 #define MYRI10GE_MAX_SEND_DESC_TSO ((65536 / 2048) * 2)
+#define MYRI10GE_MAX_LRO_DESCRIPTORS 8
+#define MYRI10GE_LRO_MAX_PKTS 64
 
 #define MYRI10GE_NO_CONFIRM_DATA htonl(0xffffffff)
 #define MYRI10GE_NO_RESPONSE_RESULT 0xffffffff
@@ -151,6 +156,8 @@ struct myri10ge_rx_done {
        dma_addr_t bus;
        int cnt;
        int idx;
+       struct net_lro_mgr lro_mgr;
+       struct net_lro_desc lro_desc[MYRI10GE_MAX_LRO_DESCRIPTORS];
 };
 
 struct myri10ge_priv {
@@ -278,6 +285,14 @@ static int myri10ge_debug = -1;    /* defaults above */
 module_param(myri10ge_debug, int, 0);
 MODULE_PARM_DESC(myri10ge_debug, "Debug level (0=none,...,16=all)");
 
+static int myri10ge_lro = 1;
+module_param(myri10ge_lro, int, S_IRUGO);
+MODULE_PARM_DESC(myri10ge_lro, "Enable large receive offload\n");
+
+static int myri10ge_lro_max_pkts = MYRI10GE_LRO_MAX_PKTS;
+module_param(myri10ge_lro_max_pkts, int, S_IRUGO);
+MODULE_PARM_DESC(myri10ge_lro, "Number of LRO packets to be aggregated\n");
+
 static int myri10ge_fill_thresh = 256;
 module_param(myri10ge_fill_thresh, int, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(myri10ge_fill_thresh, "Number of empty rx slots allowed\n");
@@ -1021,6 +1036,15 @@ myri10ge_rx_done(struct myri10ge_priv *mgp, struct 
myri10ge_rx_buf *rx,
                remainder -= MYRI10GE_ALLOC_SIZE;
        }
 
+       if (mgp->csum_flag && myri10ge_lro) {
+               rx_frags[0].page_offset += MXGEFW_PAD;
+               rx_frags[0].size -= MXGEFW_PAD;
+               len -= MXGEFW_PAD;
+               lro_receive_frags(&mgp->rx_done.lro_mgr, rx_frags,
+                                 len, len, (void *)(unsigned long)csum, csum);
+               return 1;
+       }
+
        hlen = MYRI10GE_HLEN > len ? len : MYRI10GE_HLEN;
 
        /* allocate an skb to attach the page(s) to. */
@@ -1136,6 +1160,9 @@ static inline int myri10ge_clean_rx_done(struct 
myri10ge_priv *mgp, int budget)
        mgp->stats.rx_packets += rx_packets;
        mgp->stats.rx_bytes += rx_bytes;
 
+       if (myri10ge_lro)
+               lro_flush_all(&rx_done->lro_mgr);
+
        /* restock receive rings if needed */
        if (mgp->rx_small.fill_cnt - mgp->rx_small.cnt < myri10ge_fill_thresh)
                myri10ge_alloc_rx_pages(mgp, &mgp->rx_small,
@@ -1373,7 +1400,8 @@ static const char 
myri10ge_gstrings_stats[][ETH_GSTRING_LEN] = {
        "dropped_pause", "dropped_bad_phy", "dropped_bad_crc32",
        "dropped_unicast_filtered", "dropped_multicast_filtered",
        "dropped_runt", "dropped_overrun", "dropped_no_small_buffer",
-       "dropped_no_big_buffer"
+       "dropped_no_big_buffer", "LRO aggregated", "LRO flushed",
+       "LRO avg aggr", "LRO no_desc"
 };
 
 #define MYRI10GE_NET_STATS_LEN      21
@@ -1439,6 +1467,14 @@ myri10ge_get_ethtool_stats(struct net_device *netdev,
        data[i++] = (unsigned int)ntohl(mgp->fw_stats->dropped_overrun);
        data[i++] = (unsigned int)ntohl(mgp->fw_stats->dropped_no_small_buffer);
        data[i++] = (unsigned int)ntohl(mgp->fw_stats->dropped_no_big_buffer);
+       data[i++] = mgp->rx_done.lro_mgr.stats.aggregated;
+       data[i++] = mgp->rx_done.lro_mgr.stats.flushed;
+       if (mgp->rx_done.lro_mgr.stats.flushed)
+               data[i++] = mgp->rx_done.lro_mgr.stats.aggregated /
+                   mgp->rx_done.lro_mgr.stats.flushed;
+       else
+               data[i++] = 0;
+       data[i++] = mgp->rx_done.lro_mgr.stats.no_desc;
 }
 
 static void myri10ge_set_msglevel(struct net_device *netdev, u32 value)
@@ -1712,10 +1748,69 @@ static void myri10ge_free_irq(struct myri10ge_priv *mgp)
                pci_disable_msi(pdev);
 }
 
+static int
+myri10ge_get_frag_header(struct skb_frag_struct *frag, void **mac_hdr,
+                        void **ip_hdr, void **tcpudp_hdr,
+                        u64 * hdr_flags, void *priv)
+{
+       struct ethhdr *eh;
+       struct vlan_ethhdr *veh;
+       struct iphdr *iph;
+       u8 *va = page_address(frag->page) + frag->page_offset;
+       unsigned long ll_hlen;
+       __wsum csum = (__wsum) (unsigned long)priv;
+
+       /* find the mac header, aborting if not IPv4 */
+
+       eh = (struct ethhdr *)va;
+       *mac_hdr = eh;
+       ll_hlen = ETH_HLEN;
+       if (eh->h_proto != htons(ETH_P_IP)) {
+               if (eh->h_proto == htons(ETH_P_8021Q)) {
+                       veh = (struct vlan_ethhdr *)va;
+                       if (veh->h_vlan_encapsulated_proto != htons(ETH_P_IP))
+                               return -1;
+
+                       ll_hlen += VLAN_HLEN;
+
+                       /*
+                        *  HW checksum starts ETH_HLEN bytes into
+                        *  frame, so we must subtract off the VLAN
+                        *  header's checksum before csum can be used
+                        */
+                       csum = csum_sub(csum, csum_partial(va + ETH_HLEN,
+                                                          VLAN_HLEN, 0));
+               } else {
+                       return -1;
+               }
+       }
+       *hdr_flags = LRO_IPV4;
+
+       iph = (struct iphdr *)(va + ll_hlen);
+       *ip_hdr = iph;
+       if (iph->protocol != IPPROTO_TCP)
+               return -1;
+       *hdr_flags |= LRO_TCP;
+       *tcpudp_hdr = (u8 *) (*ip_hdr) + (iph->ihl << 2);
+
+       /* verify the IP checksum */
+       if (unlikely(ip_fast_csum((u8 *) iph, iph->ihl)))
+               return -1;
+
+       /* verify the  checksum */
+       if (unlikely(csum_tcpudp_magic(iph->saddr, iph->daddr,
+                                      ntohs(iph->tot_len) - (iph->ihl << 2),
+                                      IPPROTO_TCP, csum)))
+               return -1;
+
+       return 0;
+}
+
 static int myri10ge_open(struct net_device *dev)
 {
        struct myri10ge_priv *mgp;
        struct myri10ge_cmd cmd;
+       struct net_lro_mgr *lro_mgr;
        int status, big_pow2;
 
        mgp = netdev_priv(dev);
@@ -1847,6 +1942,18 @@ static int myri10ge_open(struct net_device *dev)
        mgp->link_state = htonl(~0U);
        mgp->rdma_tags_available = 15;
 
+       lro_mgr = &mgp->rx_done.lro_mgr;
+       lro_mgr->dev = dev;
+       lro_mgr->features = LRO_F_NAPI;
+       lro_mgr->ip_summed = CHECKSUM_COMPLETE;
+       lro_mgr->ip_summed_aggr = CHECKSUM_UNNECESSARY;
+       lro_mgr->max_desc = MYRI10GE_MAX_LRO_DESCRIPTORS;
+       lro_mgr->lro_arr = mgp->rx_done.lro_desc;
+       lro_mgr->get_frag_header = myri10ge_get_frag_header;
+       lro_mgr->max_aggr = myri10ge_lro_max_pkts;
+       if (lro_mgr->max_aggr > MAX_SKB_FRAGS)
+               lro_mgr->max_aggr = MAX_SKB_FRAGS;
+
        napi_enable(&mgp->napi);        /* must happen prior to any irq */
 
        status = myri10ge_send_cmd(mgp, MXGEFW_CMD_ETHERNET_UP, &cmd, 0);
-
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