提交 84a200b3 编写于 作者: V Varun Prakash 提交者: David S. Miller

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: NVarun Prakash <varun@chelsio.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 76fed8a9
/*
* This file is part of the Chelsio T4 Ethernet driver for Linux.
*
* Copyright (c) 2015 Chelsio Communications, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifdef CONFIG_CHELSIO_T4_FCOE
#include <scsi/fc/fc_fs.h>
#include <scsi/libfcoe.h>
#include "cxgb4.h"
bool cxgb_fcoe_sof_eof_supported(struct adapter *adap, struct sk_buff *skb)
{
struct fcoe_hdr *fcoeh = (struct fcoe_hdr *)skb_network_header(skb);
u8 sof = fcoeh->fcoe_sof;
u8 eof = 0;
if ((sof != FC_SOF_I3) && (sof != FC_SOF_N3)) {
dev_err(adap->pdev_dev, "Unsupported SOF 0x%x\n", sof);
return 0;
}
skb_copy_bits(skb, skb->len - 4, &eof, 1);
if ((eof != FC_EOF_N) && (eof != FC_EOF_T)) {
dev_err(adap->pdev_dev, "Unsupported EOF 0x%x\n", eof);
return 0;
}
return 1;
}
/**
* cxgb_fcoe_enable - enable FCoE offload features
* @netdev: net device
*
* Returns 0 on success or -EINVAL on failure.
*/
int cxgb_fcoe_enable(struct net_device *netdev)
{
struct port_info *pi = netdev_priv(netdev);
struct adapter *adap = pi->adapter;
struct cxgb_fcoe *fcoe = &pi->fcoe;
if (is_t4(adap->params.chip))
return -EINVAL;
if (!(adap->flags & FULL_INIT_DONE))
return -EINVAL;
dev_info(adap->pdev_dev, "Enabling FCoE offload features\n");
netdev->features |= NETIF_F_FCOE_CRC;
netdev->vlan_features |= NETIF_F_FCOE_CRC;
netdev->features |= NETIF_F_FCOE_MTU;
netdev->vlan_features |= NETIF_F_FCOE_MTU;
netdev_features_change(netdev);
fcoe->flags |= CXGB_FCOE_ENABLED;
return 0;
}
/**
* cxgb_fcoe_disable - disable FCoE offload
* @netdev: net device
*
* Returns 0 on success or -EINVAL on failure.
*/
int cxgb_fcoe_disable(struct net_device *netdev)
{
struct port_info *pi = netdev_priv(netdev);
struct adapter *adap = pi->adapter;
struct cxgb_fcoe *fcoe = &pi->fcoe;
if (!(fcoe->flags & CXGB_FCOE_ENABLED))
return -EINVAL;
dev_info(adap->pdev_dev, "Disabling FCoE offload features\n");
fcoe->flags &= ~CXGB_FCOE_ENABLED;
netdev->features &= ~NETIF_F_FCOE_CRC;
netdev->vlan_features &= ~NETIF_F_FCOE_CRC;
netdev->features &= ~NETIF_F_FCOE_MTU;
netdev->vlan_features &= ~NETIF_F_FCOE_MTU;
netdev_features_change(netdev);
return 0;
}
#endif /* CONFIG_CHELSIO_T4_FCOE */
......@@ -1271,6 +1271,10 @@ static u16 cxgb_select_queue(struct net_device *dev, struct sk_buff *skb,
txq = 0;
} else {
txq = (vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
#ifdef CONFIG_CHELSIO_T4_FCOE
if (skb->protocol == htons(ETH_P_FCOE))
txq = skb->priority & 0x7;
#endif /* CONFIG_CHELSIO_T4_FCOE */
}
return txq;
}
......@@ -4578,6 +4582,10 @@ static const struct net_device_ops cxgb4_netdev_ops = {
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = cxgb_netpoll,
#endif
#ifdef CONFIG_CHELSIO_T4_FCOE
.ndo_fcoe_enable = cxgb_fcoe_enable,
.ndo_fcoe_disable = cxgb_fcoe_disable,
#endif /* CONFIG_CHELSIO_T4_FCOE */
#ifdef CONFIG_NET_RX_BUSY_POLL
.ndo_busy_poll = cxgb_busy_poll,
#endif
......
......@@ -46,6 +46,9 @@
#ifdef CONFIG_NET_RX_BUSY_POLL
#include <net/busy_poll.h>
#endif /* CONFIG_NET_RX_BUSY_POLL */
#ifdef CONFIG_CHELSIO_T4_FCOE
#include <scsi/fc/fc_fcoe.h>
#endif /* CONFIG_CHELSIO_T4_FCOE */
#include "cxgb4.h"
#include "t4_regs.h"
#include "t4_values.h"
......@@ -1044,6 +1047,38 @@ static inline void txq_advance(struct sge_txq *q, unsigned int n)
q->pidx -= q->size;
}
#ifdef CONFIG_CHELSIO_T4_FCOE
static inline int
cxgb_fcoe_offload(struct sk_buff *skb, struct adapter *adap,
const struct port_info *pi, u64 *cntrl)
{
const struct cxgb_fcoe *fcoe = &pi->fcoe;
if (!(fcoe->flags & CXGB_FCOE_ENABLED))
return 0;
if (skb->protocol != htons(ETH_P_FCOE))
return 0;
skb_reset_mac_header(skb);
skb->mac_len = sizeof(struct ethhdr);
skb_set_network_header(skb, skb->mac_len);
skb_set_transport_header(skb, skb->mac_len + sizeof(struct fcoe_hdr));
if (!cxgb_fcoe_sof_eof_supported(adap, skb))
return -ENOTSUPP;
/* FC CRC offload */
*cntrl = TXPKT_CSUM_TYPE(TX_CSUM_FCOE) |
TXPKT_L4CSUM_DIS | TXPKT_IPCSUM_DIS |
TXPKT_CSUM_START(CXGB_FCOE_TXPKT_CSUM_START) |
TXPKT_CSUM_END(CXGB_FCOE_TXPKT_CSUM_END) |
TXPKT_CSUM_LOC(CXGB_FCOE_TXPKT_CSUM_END);
return 0;
}
#endif /* CONFIG_CHELSIO_T4_FCOE */
/**
* t4_eth_xmit - add a packet to an Ethernet Tx queue
* @skb: the packet
......@@ -1066,6 +1101,9 @@ netdev_tx_t t4_eth_xmit(struct sk_buff *skb, struct net_device *dev)
const struct skb_shared_info *ssi;
dma_addr_t addr[MAX_SKB_FRAGS + 1];
bool immediate = false;
#ifdef CONFIG_CHELSIO_T4_FCOE
int err;
#endif /* CONFIG_CHELSIO_T4_FCOE */
/*
* The chip min packet length is 10 octets but play safe and reject
......@@ -1082,6 +1120,13 @@ out_free: dev_kfree_skb_any(skb);
q = &adap->sge.ethtxq[qidx + pi->first_qset];
reclaim_completed_tx(adap, &q->q, true);
cntrl = TXPKT_L4CSUM_DIS | TXPKT_IPCSUM_DIS;
#ifdef CONFIG_CHELSIO_T4_FCOE
err = cxgb_fcoe_offload(skb, adap, pi, &cntrl);
if (unlikely(err == -ENOTSUPP))
goto out_free;
#endif /* CONFIG_CHELSIO_T4_FCOE */
flits = calc_tx_flits(skb);
ndesc = flits_to_desc(flits);
......@@ -1153,13 +1198,17 @@ out_free: dev_kfree_skb_any(skb);
if (skb->ip_summed == CHECKSUM_PARTIAL) {
cntrl = hwcsum(skb) | TXPKT_IPCSUM_DIS;
q->tx_cso++;
} else
cntrl = TXPKT_L4CSUM_DIS | TXPKT_IPCSUM_DIS;
}
}
if (skb_vlan_tag_present(skb)) {
q->vlan_ins++;
cntrl |= TXPKT_VLAN_VLD | TXPKT_VLAN(skb_vlan_tag_get(skb));
#ifdef CONFIG_CHELSIO_T4_FCOE
if (skb->protocol == htons(ETH_P_FCOE))
cntrl |= TXPKT_VLAN(
((skb->priority & 0x7) << VLAN_PRIO_SHIFT));
#endif /* CONFIG_CHELSIO_T4_FCOE */
}
cpl->ctrl0 = htonl(TXPKT_OPCODE(CPL_TX_PKT_XT) |
......@@ -1759,6 +1808,9 @@ int t4_ethrx_handler(struct sge_rspq *q, const __be64 *rsp,
struct sge *s = &q->adap->sge;
int cpl_trace_pkt = is_t4(q->adap->params.chip) ?
CPL_TRACE_PKT : CPL_TRACE_PKT_T5;
#ifdef CONFIG_CHELSIO_T4_FCOE
struct port_info *pi;
#endif
if (unlikely(*(u8 *)rsp == cpl_trace_pkt))
return handle_trace_pkt(q->adap, si);
......@@ -1799,8 +1851,24 @@ int t4_ethrx_handler(struct sge_rspq *q, const __be64 *rsp,
skb->ip_summed = CHECKSUM_COMPLETE;
rxq->stats.rx_cso++;
}
} else
} else {
skb_checksum_none_assert(skb);
#ifdef CONFIG_CHELSIO_T4_FCOE
#define CPL_RX_PKT_FLAGS (RXF_PSH_F | RXF_SYN_F | RXF_UDP_F | \
RXF_TCP_F | RXF_IP_F | RXF_IP6_F | RXF_LRO_F)
pi = netdev_priv(skb->dev);
if (!(pkt->l2info & cpu_to_be32(CPL_RX_PKT_FLAGS))) {
if ((pkt->l2info & cpu_to_be32(RXF_FCOE_F)) &&
(pi->fcoe.flags & CXGB_FCOE_ENABLED)) {
if (!(pkt->err_vec & cpu_to_be16(RXERR_CSUM_F)))
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
}
#undef CPL_RX_PKT_FLAGS
#endif /* CONFIG_CHELSIO_T4_FCOE */
}
if (unlikely(pkt->vlan_ex)) {
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), ntohs(pkt->vlan));
......
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