cxgb4: add cxgb4_fcoe.c for FCoE
This patch adds cxgb4_fcoe.c and enables FCOE_CRC, FCOE_MTU net device features. Signed-off-by: Varun Prakash <varun@chelsio.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Varun Prakash
David S. Miller
Родитель
76fed8a989
Коммит
84a200b390
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@ -0,0 +1,122 @@
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/*
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* This file is part of the Chelsio T4 Ethernet driver for Linux.
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*
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* Copyright (c) 2015 Chelsio Communications, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifdef CONFIG_CHELSIO_T4_FCOE
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#include <scsi/fc/fc_fs.h>
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#include <scsi/libfcoe.h>
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#include "cxgb4.h"
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bool cxgb_fcoe_sof_eof_supported(struct adapter *adap, struct sk_buff *skb)
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{
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struct fcoe_hdr *fcoeh = (struct fcoe_hdr *)skb_network_header(skb);
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u8 sof = fcoeh->fcoe_sof;
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u8 eof = 0;
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if ((sof != FC_SOF_I3) && (sof != FC_SOF_N3)) {
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dev_err(adap->pdev_dev, "Unsupported SOF 0x%x\n", sof);
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return 0;
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}
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skb_copy_bits(skb, skb->len - 4, &eof, 1);
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if ((eof != FC_EOF_N) && (eof != FC_EOF_T)) {
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dev_err(adap->pdev_dev, "Unsupported EOF 0x%x\n", eof);
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return 0;
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}
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return 1;
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}
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/**
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* cxgb_fcoe_enable - enable FCoE offload features
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* @netdev: net device
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*
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* Returns 0 on success or -EINVAL on failure.
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*/
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int cxgb_fcoe_enable(struct net_device *netdev)
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{
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struct port_info *pi = netdev_priv(netdev);
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struct adapter *adap = pi->adapter;
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struct cxgb_fcoe *fcoe = &pi->fcoe;
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if (is_t4(adap->params.chip))
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return -EINVAL;
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if (!(adap->flags & FULL_INIT_DONE))
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return -EINVAL;
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dev_info(adap->pdev_dev, "Enabling FCoE offload features\n");
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netdev->features |= NETIF_F_FCOE_CRC;
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netdev->vlan_features |= NETIF_F_FCOE_CRC;
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netdev->features |= NETIF_F_FCOE_MTU;
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netdev->vlan_features |= NETIF_F_FCOE_MTU;
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netdev_features_change(netdev);
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fcoe->flags |= CXGB_FCOE_ENABLED;
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return 0;
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}
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/**
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* cxgb_fcoe_disable - disable FCoE offload
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* @netdev: net device
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*
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* Returns 0 on success or -EINVAL on failure.
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*/
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int cxgb_fcoe_disable(struct net_device *netdev)
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{
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struct port_info *pi = netdev_priv(netdev);
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struct adapter *adap = pi->adapter;
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struct cxgb_fcoe *fcoe = &pi->fcoe;
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if (!(fcoe->flags & CXGB_FCOE_ENABLED))
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return -EINVAL;
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dev_info(adap->pdev_dev, "Disabling FCoE offload features\n");
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fcoe->flags &= ~CXGB_FCOE_ENABLED;
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netdev->features &= ~NETIF_F_FCOE_CRC;
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netdev->vlan_features &= ~NETIF_F_FCOE_CRC;
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netdev->features &= ~NETIF_F_FCOE_MTU;
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netdev->vlan_features &= ~NETIF_F_FCOE_MTU;
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netdev_features_change(netdev);
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return 0;
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}
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#endif /* CONFIG_CHELSIO_T4_FCOE */
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@ -1271,6 +1271,10 @@ static u16 cxgb_select_queue(struct net_device *dev, struct sk_buff *skb,
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txq = 0;
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} else {
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txq = (vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
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#ifdef CONFIG_CHELSIO_T4_FCOE
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if (skb->protocol == htons(ETH_P_FCOE))
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txq = skb->priority & 0x7;
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#endif /* CONFIG_CHELSIO_T4_FCOE */
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}
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return txq;
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}
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@ -4578,6 +4582,10 @@ static const struct net_device_ops cxgb4_netdev_ops = {
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#ifdef CONFIG_NET_POLL_CONTROLLER
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.ndo_poll_controller = cxgb_netpoll,
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#endif
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#ifdef CONFIG_CHELSIO_T4_FCOE
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.ndo_fcoe_enable = cxgb_fcoe_enable,
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.ndo_fcoe_disable = cxgb_fcoe_disable,
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#endif /* CONFIG_CHELSIO_T4_FCOE */
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#ifdef CONFIG_NET_RX_BUSY_POLL
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.ndo_busy_poll = cxgb_busy_poll,
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#endif
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@ -46,6 +46,9 @@
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#ifdef CONFIG_NET_RX_BUSY_POLL
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#include <net/busy_poll.h>
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#endif /* CONFIG_NET_RX_BUSY_POLL */
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#ifdef CONFIG_CHELSIO_T4_FCOE
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#include <scsi/fc/fc_fcoe.h>
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#endif /* CONFIG_CHELSIO_T4_FCOE */
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#include "cxgb4.h"
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#include "t4_regs.h"
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#include "t4_values.h"
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@ -1044,6 +1047,38 @@ static inline void txq_advance(struct sge_txq *q, unsigned int n)
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q->pidx -= q->size;
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}
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#ifdef CONFIG_CHELSIO_T4_FCOE
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static inline int
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cxgb_fcoe_offload(struct sk_buff *skb, struct adapter *adap,
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const struct port_info *pi, u64 *cntrl)
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{
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const struct cxgb_fcoe *fcoe = &pi->fcoe;
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if (!(fcoe->flags & CXGB_FCOE_ENABLED))
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return 0;
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if (skb->protocol != htons(ETH_P_FCOE))
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return 0;
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skb_reset_mac_header(skb);
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skb->mac_len = sizeof(struct ethhdr);
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skb_set_network_header(skb, skb->mac_len);
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skb_set_transport_header(skb, skb->mac_len + sizeof(struct fcoe_hdr));
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if (!cxgb_fcoe_sof_eof_supported(adap, skb))
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return -ENOTSUPP;
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/* FC CRC offload */
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*cntrl = TXPKT_CSUM_TYPE(TX_CSUM_FCOE) |
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TXPKT_L4CSUM_DIS | TXPKT_IPCSUM_DIS |
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TXPKT_CSUM_START(CXGB_FCOE_TXPKT_CSUM_START) |
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TXPKT_CSUM_END(CXGB_FCOE_TXPKT_CSUM_END) |
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TXPKT_CSUM_LOC(CXGB_FCOE_TXPKT_CSUM_END);
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return 0;
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}
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#endif /* CONFIG_CHELSIO_T4_FCOE */
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/**
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* t4_eth_xmit - add a packet to an Ethernet Tx queue
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* @skb: the packet
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@ -1066,6 +1101,9 @@ netdev_tx_t t4_eth_xmit(struct sk_buff *skb, struct net_device *dev)
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const struct skb_shared_info *ssi;
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dma_addr_t addr[MAX_SKB_FRAGS + 1];
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bool immediate = false;
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#ifdef CONFIG_CHELSIO_T4_FCOE
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int err;
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#endif /* CONFIG_CHELSIO_T4_FCOE */
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/*
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* The chip min packet length is 10 octets but play safe and reject
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@ -1082,6 +1120,13 @@ out_free: dev_kfree_skb_any(skb);
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q = &adap->sge.ethtxq[qidx + pi->first_qset];
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reclaim_completed_tx(adap, &q->q, true);
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cntrl = TXPKT_L4CSUM_DIS | TXPKT_IPCSUM_DIS;
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#ifdef CONFIG_CHELSIO_T4_FCOE
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err = cxgb_fcoe_offload(skb, adap, pi, &cntrl);
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if (unlikely(err == -ENOTSUPP))
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goto out_free;
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#endif /* CONFIG_CHELSIO_T4_FCOE */
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flits = calc_tx_flits(skb);
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ndesc = flits_to_desc(flits);
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if (skb->ip_summed == CHECKSUM_PARTIAL) {
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cntrl = hwcsum(skb) | TXPKT_IPCSUM_DIS;
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q->tx_cso++;
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} else
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cntrl = TXPKT_L4CSUM_DIS | TXPKT_IPCSUM_DIS;
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}
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}
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if (skb_vlan_tag_present(skb)) {
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q->vlan_ins++;
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cntrl |= TXPKT_VLAN_VLD | TXPKT_VLAN(skb_vlan_tag_get(skb));
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#ifdef CONFIG_CHELSIO_T4_FCOE
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if (skb->protocol == htons(ETH_P_FCOE))
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cntrl |= TXPKT_VLAN(
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((skb->priority & 0x7) << VLAN_PRIO_SHIFT));
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#endif /* CONFIG_CHELSIO_T4_FCOE */
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}
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cpl->ctrl0 = htonl(TXPKT_OPCODE(CPL_TX_PKT_XT) |
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@ -1759,6 +1808,9 @@ int t4_ethrx_handler(struct sge_rspq *q, const __be64 *rsp,
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struct sge *s = &q->adap->sge;
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int cpl_trace_pkt = is_t4(q->adap->params.chip) ?
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CPL_TRACE_PKT : CPL_TRACE_PKT_T5;
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#ifdef CONFIG_CHELSIO_T4_FCOE
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struct port_info *pi;
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#endif
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if (unlikely(*(u8 *)rsp == cpl_trace_pkt))
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return handle_trace_pkt(q->adap, si);
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@ -1799,8 +1851,24 @@ int t4_ethrx_handler(struct sge_rspq *q, const __be64 *rsp,
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skb->ip_summed = CHECKSUM_COMPLETE;
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rxq->stats.rx_cso++;
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}
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} else
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} else {
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skb_checksum_none_assert(skb);
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#ifdef CONFIG_CHELSIO_T4_FCOE
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#define CPL_RX_PKT_FLAGS (RXF_PSH_F | RXF_SYN_F | RXF_UDP_F | \
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RXF_TCP_F | RXF_IP_F | RXF_IP6_F | RXF_LRO_F)
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pi = netdev_priv(skb->dev);
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if (!(pkt->l2info & cpu_to_be32(CPL_RX_PKT_FLAGS))) {
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if ((pkt->l2info & cpu_to_be32(RXF_FCOE_F)) &&
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(pi->fcoe.flags & CXGB_FCOE_ENABLED)) {
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if (!(pkt->err_vec & cpu_to_be16(RXERR_CSUM_F)))
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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}
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}
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#undef CPL_RX_PKT_FLAGS
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#endif /* CONFIG_CHELSIO_T4_FCOE */
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}
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if (unlikely(pkt->vlan_ex)) {
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__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), ntohs(pkt->vlan));
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