enic: Feature Add: Replace LRO with GRO

enic now uses the GRO mechanism instead of LRO to pass skbs to upper
layers.

Signed-off-by: Scott Feldman <scofeldm@cisco.com>
Signed-off-by: Vasanthy Kolluri <vkolluri@cisco.com>
Signed-off-by: Roopa Prabhu <roprabhu@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 9 insertions, 79 deletions

diff --git a/drivers/net/enic/enic.h b/drivers/net/enic/enic.h
index 45e86d1e5b1..81c2adeaa9b 100644
--- a/drivers/net/enic/enic.h
+++ b/drivers/net/enic/enic.h
@@ -20,8 +20,6 @@
 #ifndef _ENIC_H_
 #define _ENIC_H_
 
-#include <linux/inet_lro.h>
-
 #include "vnic_enet.h"
 #include "vnic_dev.h"
 #include "vnic_wq.h"
@@ -34,13 +32,10 @@
 
 #define DRV_NAME                "enic"
 #define DRV_DESCRIPTION         "Cisco VIC Ethernet NIC Driver"
-#define DRV_VERSION             "1.3.1.1-pp"
+#define DRV_VERSION             "1.4.1.1"
 #define DRV_COPYRIGHT           "Copyright 2008-2009 Cisco Systems, Inc"
 #define PFX                     DRV_NAME ": "
 
-#define ENIC_LRO_MAX_DESC       8
-#define ENIC_LRO_MAX_AGGR       64
-
 #define ENIC_BARS_MAX           6
 
 #define ENIC_WQ_MAX             8
@@ -124,8 +119,6 @@ struct enic {
         u64 rq_truncated_pkts;
         u64 rq_bad_fcs;
         struct napi_struct napi;
-        struct net_lro_mgr lro_mgr;
-        struct net_lro_desc lro_desc[ENIC_LRO_MAX_DESC];
 
         /* interrupt resource cache line section */
         ____cacheline_aligned struct vnic_intr intr[ENIC_INTR_MAX];
diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index bc7d6b96de3..c2b848f58c2 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -1287,51 +1287,6 @@ static int enic_set_rq_alloc_buf(struct enic *enic)
         return 0;
 }
 
-static int enic_get_skb_header(struct sk_buff *skb, void **iphdr,
-        void **tcph, u64 *hdr_flags, void *priv)
-{
-        struct cq_enet_rq_desc *cq_desc = priv;
-        unsigned int ip_len;
-        struct iphdr *iph;
-
-        u8 type, color, eop, sop, ingress_port, vlan_stripped;
-        u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
-        u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
-        u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
-        u8 packet_error;
-        u16 q_number, completed_index, bytes_written, vlan, checksum;
-        u32 rss_hash;
-
-        cq_enet_rq_desc_dec(cq_desc,
-                &type, &color, &q_number, &completed_index,
-                &ingress_port, &fcoe, &eop, &sop, &rss_type,
-                &csum_not_calc, &rss_hash, &bytes_written,
-                &packet_error, &vlan_stripped, &vlan, &checksum,
-                &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
-                &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
-                &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
-                &fcs_ok);
-
-        if (!(ipv4 && tcp && !ipv4_fragment))
-                return -1;
-
-        skb_reset_network_header(skb);
-        iph = ip_hdr(skb);
-
-        ip_len = ip_hdrlen(skb);
-        skb_set_transport_header(skb, ip_len);
-
-        /* check if ip header and tcp header are complete */
-        if (ntohs(iph->tot_len) < ip_len + tcp_hdrlen(skb))
-                return -1;
-
-        *hdr_flags = LRO_IPV4 | LRO_TCP;
-        *tcph = tcp_hdr(skb);
-        *iphdr = iph;
-
-        return 0;
-}
-
 static void enic_rq_indicate_buf(struct vnic_rq *rq,
         struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
         int skipped, void *opaque)
@@ -1397,18 +1352,17 @@ static void enic_rq_indicate_buf(struct vnic_rq *rq,
 
                 if (enic->vlan_group && vlan_stripped) {
 
-                        if ((netdev->features & NETIF_F_LRO) && ipv4)
-                                lro_vlan_hwaccel_receive_skb(&enic->lro_mgr,
-                                        skb, enic->vlan_group,
-                                        vlan, cq_desc);
+                        if (netdev->features & NETIF_F_GRO)
+                                vlan_gro_receive(&enic->napi, enic->vlan_group,
+                                        vlan, skb);
                         else
                                 vlan_hwaccel_receive_skb(skb,
                                         enic->vlan_group, vlan);
 
                 } else {
 
-                        if ((netdev->features & NETIF_F_LRO) && ipv4)
-                                lro_receive_skb(&enic->lro_mgr, skb, cq_desc);
+                        if (netdev->features & NETIF_F_GRO)
+                                napi_gro_receive(&enic->napi, skb);
                         else
                                 netif_receive_skb(skb);
 
@@ -1438,7 +1392,6 @@ static int enic_rq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
 static int enic_poll(struct napi_struct *napi, int budget)
 {
         struct enic *enic = container_of(napi, struct enic, napi);
-        struct net_device *netdev = enic->netdev;
         unsigned int rq_work_to_do = budget;
         unsigned int wq_work_to_do = -1; /* no limit */
         unsigned int  work_done, rq_work_done, wq_work_done;
@@ -1478,12 +1431,9 @@ static int enic_poll(struct napi_struct *napi, int budget)
         if (rq_work_done < rq_work_to_do) {
 
                 /* Some work done, but not enough to stay in polling,
-                 * flush all LROs and exit polling
+                 * exit polling
                  */
 
-                if (netdev->features & NETIF_F_LRO)
-                        lro_flush_all(&enic->lro_mgr);
-
                 napi_complete(napi);
                 vnic_intr_unmask(&enic->intr[ENIC_INTX_WQ_RQ]);
         }
@@ -1494,7 +1444,6 @@ static int enic_poll(struct napi_struct *napi, int budget)
 static int enic_poll_msix(struct napi_struct *napi, int budget)
 {
         struct enic *enic = container_of(napi, struct enic, napi);
-        struct net_device *netdev = enic->netdev;
         unsigned int work_to_do = budget;
         unsigned int work_done;
         int err;
@@ -1528,12 +1477,9 @@ static int enic_poll_msix(struct napi_struct *napi, int budget)
         if (work_done < work_to_do) {
 
                 /* Some work done, but not enough to stay in polling,
-                 * flush all LROs and exit polling
+                 * exit polling
                  */
 
-                if (netdev->features & NETIF_F_LRO)
-                        lro_flush_all(&enic->lro_mgr);
-
                 napi_complete(napi);
                 vnic_intr_unmask(&enic->intr[ENIC_MSIX_RQ]);
         }
@@ -2378,21 +2324,12 @@ static int __devinit enic_probe(struct pci_dev *pdev,
                 netdev->features |= NETIF_F_TSO |
                         NETIF_F_TSO6 | NETIF_F_TSO_ECN;
         if (ENIC_SETTING(enic, LRO))
-                netdev->features |= NETIF_F_LRO;
+                netdev->features |= NETIF_F_GRO;
         if (using_dac)
                 netdev->features |= NETIF_F_HIGHDMA;
 
         enic->csum_rx_enabled = ENIC_SETTING(enic, RXCSUM);
 
-        enic->lro_mgr.max_aggr = ENIC_LRO_MAX_AGGR;
-        enic->lro_mgr.max_desc = ENIC_LRO_MAX_DESC;
-        enic->lro_mgr.lro_arr = enic->lro_desc;
-        enic->lro_mgr.get_skb_header = enic_get_skb_header;
-        enic->lro_mgr.features  = LRO_F_NAPI | LRO_F_EXTRACT_VLAN_ID;
-        enic->lro_mgr.dev = netdev;
-        enic->lro_mgr.ip_summed = CHECKSUM_COMPLETE;
-        enic->lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
-
         err = register_netdev(netdev);
         if (err) {
                 printk(KERN_ERR PFX