[net-next-2.6 PATCH 7/8] ixgbe: Implement FCoE Rx side large receive offload feature to 82599

Jeff Kirsher
2009-05-13T23:11:53Z

This patch implements the FCoE Rx side offload feature in ixgbe_main.c
to 82599 using the Rx offload infrastructure code added in the previous
patch. The large receive offload by Direct Data Placement (DDP) for
FCoE is achieved by implementing the ndo_fcoe_ddp_setup and ndo_fcoe_ddp_done
in net_device_ops via netdev. It is up to the ULD, i.e., fcoe and libfc
to query and setup large receive offload accordingly through the corresponding
netdev upon creating fcoe instances.

Signed-off-by: Yi Zou <yi.zou@intel.com>
Acked-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

drivers/net/ixgbe/ixgbe.h | 7 +++++++
drivers/net/ixgbe/ixgbe_main.c | 16 ++++++++++++++++
2 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe.h b/drivers/net/ixgbe/ixgbe.h
index 5581fa3..db6d3ea 100644
--- a/drivers/net/ixgbe/ixgbe.h
+++ b/drivers/net/ixgbe/ixgbe.h
@@ -386,6 +386,13 @@ extern void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter);
extern int ixgbe_fso(struct ixgbe_adapter *adapter,
struct ixgbe_ring *tx_ring, struct sk_buff *skb,
u32 tx_flags, u8 *hdr_len);
+extern void ixgbe_cleanup_fcoe(struct ixgbe_adapter *adapter);
+extern int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
+ union ixgbe_adv_rx_desc *rx_desc,
+ struct sk_buff *skb);
+extern int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
+ struct scatterlist *sgl, unsigned int sgc);
+extern int ixgbe_fcoe_ddp_put(struct net_device *netdev, u16 xid);
#endif /* IXGBE_FCOE */

#endif /* _IXGBE_H_ */
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index ee80f6f..e7c44a3 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -784,6 +784,12 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
total_rx_packets++;

skb->protocol = eth_type_trans(skb, adapter->netdev);
+#ifdef IXGBE_FCOE
+ /* if ddp, not passing to ULD unless for FCP_RSP or error */
+ if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED)
+ if (!ixgbe_fcoe_ddp(adapter, rx_desc, skb))
+ goto next_desc;
+#endif /* IXGBE_FCOE */
ixgbe_receive_skb(q_vector, skb, staterr, rx_ring, rx_desc);

next_desc:
@@ -4822,6 +4828,10 @@ static const struct net_device_ops ixgbe_netdev_ops = {
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = ixgbe_netpoll,
#endif
+#ifdef IXGBE_FCOE
+ .ndo_fcoe_ddp_setup = ixgbe_fcoe_ddp_get,
+ .ndo_fcoe_ddp_done = ixgbe_fcoe_ddp_put,
+#endif /* IXGBE_FCOE */
};

/**
@@ -5036,6 +5046,7 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
if (!(device_caps & IXGBE_DEVICE_CAPS_FCOE_OFFLOADS)) {
netdev->features |= NETIF_F_FCOE_CRC;
netdev->features |= NETIF_F_FSO;
+ netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX - 1;
} else {
adapter->flags &= ~IXGBE_FLAG_FCOE_ENABLED;
}
@@ -5205,6 +5216,11 @@ static void __devexit ixgbe_remove(struct pci_dev *pdev)
}

#endif
+#ifdef IXGBE_FCOE
+ if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED)
+ ixgbe_cleanup_fcoe(adapter);
+
+#endif /* IXGBE_FCOE */
if (netdev->reg_state == NETREG_REGISTERED)
unregister_netdev(netdev);