[SCSI] fcoe, libfc: check offload features from LLD through netdev

This checks if net_devices supports FCoE offload ops in netdev_ops and it
if it does, then sets up the corresponding flags in the associated fc_lport.

For large send offload, the maximum length supported in one large send is now
described by the added lso_max in fc_lport, which is setup initially from
netdev->gso_max_size.

Signed-off-by: Yi Zou <yi.zou@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

2 files changed, 29 insertions, 1 deletions

diff --git a/drivers/scsi/fcoe/fcoe_sw.c b/drivers/scsi/fcoe/fcoe_sw.c
index da210eba1941..d99217d05104 100644
--- a/drivers/scsi/fcoe/fcoe_sw.c
+++ b/drivers/scsi/fcoe/fcoe_sw.c
@@ -133,6 +133,13 @@ static int fcoe_sw_lport_config(struct fc_lport *lp)
         /* lport fc_lport related configuration */
         fc_lport_config(lp);
 
+        /* offload related configuration */
+        lp->crc_offload = 0;
+        lp->seq_offload = 0;
+        lp->lro_enabled = 0;
+        lp->lro_xid = 0;
+        lp->lso_max = 0;
+
         return 0;
 }
 
@@ -186,7 +193,27 @@ static int fcoe_sw_netdev_config(struct fc_lport *lp, struct net_device *netdev)
         if (fc->real_dev->features & NETIF_F_SG)
                 lp->sg_supp = 1;
 
-
+#ifdef NETIF_F_FCOE_CRC
+        if (netdev->features & NETIF_F_FCOE_CRC) {
+                lp->crc_offload = 1;
+                printk(KERN_DEBUG "fcoe:%s supports FCCRC offload\n",
+                       netdev->name);
+        }
+#endif
+#ifdef NETIF_F_FSO
+        if (netdev->features & NETIF_F_FSO) {
+                lp->seq_offload = 1;
+                lp->lso_max = netdev->gso_max_size;
+                printk(KERN_DEBUG "fcoe:%s supports LSO for max len 0x%x\n",
+                       netdev->name, lp->lso_max);
+        }
+#endif
+        if (netdev->fcoe_ddp_xid) {
+                lp->lro_enabled = 1;
+                lp->lro_xid = netdev->fcoe_ddp_xid;
+                printk(KERN_DEBUG "fcoe:%s supports LRO for max xid 0x%x\n",
+                       netdev->name, lp->lro_xid);
+        }
         skb_queue_head_init(&fc->fcoe_pending_queue);
         fc->fcoe_pending_queue_active = 0;
 
diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index a2e126b86e3e..61c746cf55f3 100644
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -654,6 +654,7 @@ struct fc_lport {
         u16                     link_speed;
         u16                     link_supported_speeds;
         u16                     lro_xid;        /* max xid for fcoe lro */
+        unsigned int            lso_max;        /* max large send size */
         struct fc_ns_fts        fcts;           /* FC-4 type masks */
         struct fc_els_rnid_gen  rnid_gen;       /* RNID information */