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Message-Id: <1cc49d916480bd8c1804709719bc90e1c16ad8dc.1427199268.git.varun@chelsio.com>
Date: Tue, 24 Mar 2015 19:14:46 +0530
From: Varun Prakash <varun@...lsio.com>
To: netdev@...r.kernel.org, linux-scsi@...r.kernel.org
Cc: davem@...emloft.net, JBottomley@...allels.com, leedom@...lsio.com,
anish@...lsio.com, hariprasad@...lsio.com, praveenm@...lsio.com,
varun@...lsio.com
Subject: [PATCH 2/3] 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@...lsio.com>
---
drivers/net/ethernet/chelsio/cxgb4/cxgb4_fcoe.c | 122 +++++++++++++++++++++++
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c | 8 ++
drivers/net/ethernet/chelsio/cxgb4/sge.c | 74 +++++++++++++-
3 files changed, 201 insertions(+), 3 deletions(-)
create mode 100644 drivers/net/ethernet/chelsio/cxgb4/cxgb4_fcoe.c
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_fcoe.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_fcoe.c
new file mode 100644
index 0000000..062d3c0
--- /dev/null
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_fcoe.c
@@ -0,0 +1,122 @@
+/*
+ * 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 */
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
index dd4b2da..e40e283 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
@@ -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
diff --git a/drivers/net/ethernet/chelsio/cxgb4/sge.c b/drivers/net/ethernet/chelsio/cxgb4/sge.c
index b4b9f60..c46e7a9 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/sge.c
@@ -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));
--
1.7.1
--
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