diff options
| -rw-r--r-- | drivers/net/ixgbe/ixgbe_fcoe.c | 132 |
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 * |