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-rw-r--r--drivers/net/ixgbe/ixgbe_fcoe.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/drivers/net/ixgbe/ixgbe_fcoe.c b/drivers/net/ixgbe/ixgbe_fcoe.c
index f8c4d357636..e20facd1f2d 100644
--- a/drivers/net/ixgbe/ixgbe_fcoe.c
+++ b/drivers/net/ixgbe/ixgbe_fcoe.c
@@ -36,6 +36,138 @@
#include <scsi/libfcoe.h>
/**
+ * ixgbe_fso - ixgbe FCoE Sequence Offload (FSO)
+ * @adapter: ixgbe adapter
+ * @tx_ring: tx desc ring
+ * @skb: associated skb
+ * @tx_flags: tx flags
+ * @hdr_len: hdr_len to be returned
+ *
+ * This sets up large send offload for FCoE
+ *
+ * Returns : 0 indicates no FSO, > 0 for FSO, < 0 for error
+ */
+int ixgbe_fso(struct ixgbe_adapter *adapter,
+ struct ixgbe_ring *tx_ring, struct sk_buff *skb,
+ u32 tx_flags, u8 *hdr_len)
+{
+ u8 sof, eof;
+ u32 vlan_macip_lens;
+ u32 fcoe_sof_eof;
+ u32 type_tucmd;
+ u32 mss_l4len_idx;
+ int mss = 0;
+ unsigned int i;
+ struct ixgbe_tx_buffer *tx_buffer_info;
+ struct ixgbe_adv_tx_context_desc *context_desc;
+ struct fc_frame_header *fh;
+
+ if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE)) {
+ DPRINTK(DRV, ERR, "Wrong gso type %d:expecting SKB_GSO_FCOE\n",
+ skb_shinfo(skb)->gso_type);
+ return -EINVAL;
+ }
+
+ /* resets the header to point fcoe/fc */
+ skb_set_network_header(skb, skb->mac_len);
+ skb_set_transport_header(skb, skb->mac_len +
+ sizeof(struct fcoe_hdr));
+
+ /* sets up SOF and ORIS */
+ fcoe_sof_eof = 0;
+ sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
+ switch (sof) {
+ case FC_SOF_I2:
+ fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_ORIS;
+ break;
+ case FC_SOF_I3:
+ fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_SOF;
+ fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_ORIS;
+ break;
+ case FC_SOF_N2:
+ break;
+ case FC_SOF_N3:
+ fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_SOF;
+ break;
+ default:
+ DPRINTK(DRV, WARNING, "unknown sof = 0x%x\n", sof);
+ return -EINVAL;
+ }
+
+ /* the first byte of the last dword is EOF */
+ skb_copy_bits(skb, skb->len - 4, &eof, 1);
+ /* sets up EOF and ORIE */
+ switch (eof) {
+ case FC_EOF_N:
+ fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
+ break;
+ case FC_EOF_T:
+ /* lso needs ORIE */
+ if (skb_is_gso(skb)) {
+ fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
+ fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_ORIE;
+ } else {
+ fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_T;
+ }
+ break;
+ case FC_EOF_NI:
+ fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_NI;
+ break;
+ case FC_EOF_A:
+ fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_A;
+ break;
+ default:
+ DPRINTK(DRV, WARNING, "unknown eof = 0x%x\n", eof);
+ return -EINVAL;
+ }
+
+ /* sets up PARINC indicating data offset */
+ fh = (struct fc_frame_header *)skb_transport_header(skb);
+ if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
+ fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_PARINC;
+
+ /* hdr_len includes fc_hdr if FCoE lso is enabled */
+ *hdr_len = sizeof(struct fcoe_crc_eof);
+ if (skb_is_gso(skb))
+ *hdr_len += (skb_transport_offset(skb) +
+ sizeof(struct fc_frame_header));
+ /* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
+ vlan_macip_lens = (skb_transport_offset(skb) +
+ sizeof(struct fc_frame_header));
+ vlan_macip_lens |= ((skb_transport_offset(skb) - 4)
+ << IXGBE_ADVTXD_MACLEN_SHIFT);
+ vlan_macip_lens |= (tx_flags & IXGBE_TX_FLAGS_VLAN_MASK);
+
+ /* type_tycmd and mss: set TUCMD.FCoE to enable offload */
+ type_tucmd = IXGBE_TXD_CMD_DEXT | IXGBE_ADVTXD_DTYP_CTXT |
+ IXGBE_ADVTXT_TUCMD_FCOE;
+ if (skb_is_gso(skb))
+ mss = skb_shinfo(skb)->gso_size;
+ /* mss_l4len_id: use 1 for FSO as TSO, no need for L4LEN */
+ mss_l4len_idx = (mss << IXGBE_ADVTXD_MSS_SHIFT) |
+ (1 << IXGBE_ADVTXD_IDX_SHIFT);
+
+ /* write context desc */
+ i = tx_ring->next_to_use;
+ context_desc = IXGBE_TX_CTXTDESC_ADV(*tx_ring, i);
+ context_desc->vlan_macip_lens = cpu_to_le32(vlan_macip_lens);
+ context_desc->seqnum_seed = cpu_to_le32(fcoe_sof_eof);
+ context_desc->type_tucmd_mlhl = cpu_to_le32(type_tucmd);
+ context_desc->mss_l4len_idx = cpu_to_le32(mss_l4len_idx);
+
+ tx_buffer_info = &tx_ring->tx_buffer_info[i];
+ tx_buffer_info->time_stamp = jiffies;
+ tx_buffer_info->next_to_watch = i;
+
+ i++;
+ if (i == tx_ring->count)
+ i = 0;
+ tx_ring->next_to_use = i;
+
+ return skb_is_gso(skb);
+}
+
+/**
* ixgbe_configure_fcoe - configures registers for fcoe at start
* @adapter: ptr to ixgbe adapter
*