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ubuntu-linux-kernel/drivers/net/ethernet/intel/i40e/i40e_fcoe.c

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/*******************************************************************************
*
* Intel Ethernet Controller XL710 Family Linux Driver
* Copyright(c) 2013 - 2016 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
* The full GNU General Public License is included in this distribution in
* the file called "COPYING".
*
* Contact Information:
* e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
******************************************************************************/
#include <linux/if_ether.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/fc/fc_fs.h>
#include <scsi/fc/fc_fip.h>
#include <scsi/fc/fc_fcoe.h>
#include <scsi/libfc.h>
#include <scsi/libfcoe.h>
#include <uapi/linux/dcbnl.h>
#include "i40e.h"
#include "i40e_fcoe.h"
/**
* i40e_fcoe_sof_is_class2 - returns true if this is a FC Class 2 SOF
* @sof: the FCoE start of frame delimiter
**/
static inline bool i40e_fcoe_sof_is_class2(u8 sof)
{
return (sof == FC_SOF_I2) || (sof == FC_SOF_N2);
}
/**
* i40e_fcoe_sof_is_class3 - returns true if this is a FC Class 3 SOF
* @sof: the FCoE start of frame delimiter
**/
static inline bool i40e_fcoe_sof_is_class3(u8 sof)
{
return (sof == FC_SOF_I3) || (sof == FC_SOF_N3);
}
/**
* i40e_fcoe_sof_is_supported - returns true if the FC SOF is supported by HW
* @sof: the input SOF value from the frame
**/
static inline bool i40e_fcoe_sof_is_supported(u8 sof)
{
return i40e_fcoe_sof_is_class2(sof) ||
i40e_fcoe_sof_is_class3(sof);
}
/**
* i40e_fcoe_fc_sof - pull the SOF from FCoE header in the frame
* @skb: the frame whose EOF is to be pulled from
**/
static inline int i40e_fcoe_fc_sof(struct sk_buff *skb, u8 *sof)
{
*sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
if (!i40e_fcoe_sof_is_supported(*sof))
return -EINVAL;
return 0;
}
/**
* i40e_fcoe_eof_is_supported - returns true if the EOF is supported by HW
* @eof: the input EOF value from the frame
**/
static inline bool i40e_fcoe_eof_is_supported(u8 eof)
{
return (eof == FC_EOF_N) || (eof == FC_EOF_T) ||
(eof == FC_EOF_NI) || (eof == FC_EOF_A);
}
/**
* i40e_fcoe_fc_eof - pull EOF from FCoE trailer in the frame
* @skb: the frame whose EOF is to be pulled from
**/
static inline int i40e_fcoe_fc_eof(struct sk_buff *skb, u8 *eof)
{
/* the first byte of the last dword is EOF */
skb_copy_bits(skb, skb->len - 4, eof, 1);
if (!i40e_fcoe_eof_is_supported(*eof))
return -EINVAL;
return 0;
}
/**
* i40e_fcoe_ctxt_eof - convert input FC EOF for descriptor programming
* @eof: the input eof value from the frame
*
* The FC EOF is converted to the value understood by HW for descriptor
* programming. Never call this w/o calling i40e_fcoe_eof_is_supported()
* first and that already checks for all supported valid eof values.
**/
static inline u32 i40e_fcoe_ctxt_eof(u8 eof)
{
switch (eof) {
case FC_EOF_N:
return I40E_TX_DESC_CMD_L4T_EOFT_EOF_N;
case FC_EOF_T:
return I40E_TX_DESC_CMD_L4T_EOFT_EOF_T;
case FC_EOF_NI:
return I40E_TX_DESC_CMD_L4T_EOFT_EOF_NI;
case FC_EOF_A:
return I40E_TX_DESC_CMD_L4T_EOFT_EOF_A;
default:
/* Supported valid eof shall be already checked by
* calling i40e_fcoe_eof_is_supported() first,
* therefore this default case shall never hit.
*/
WARN_ON(1);
return -EINVAL;
}
}
/**
* i40e_fcoe_xid_is_valid - returns true if the exchange id is valid
* @xid: the exchange id
**/
static inline bool i40e_fcoe_xid_is_valid(u16 xid)
{
return (xid != FC_XID_UNKNOWN) && (xid < I40E_FCOE_DDP_MAX);
}
/**
* i40e_fcoe_ddp_unmap - unmap the mapped sglist associated
* @pf: pointer to PF
* @ddp: sw DDP context
*
* Unmap the scatter-gather list associated with the given SW DDP context
*
* Returns: data length already ddp-ed in bytes
*
**/
static inline void i40e_fcoe_ddp_unmap(struct i40e_pf *pf,
struct i40e_fcoe_ddp *ddp)
{
if (test_and_set_bit(__I40E_FCOE_DDP_UNMAPPED, &ddp->flags))
return;
if (ddp->sgl) {
dma_unmap_sg(&pf->pdev->dev, ddp->sgl, ddp->sgc,
DMA_FROM_DEVICE);
ddp->sgl = NULL;
ddp->sgc = 0;
}
if (ddp->pool) {
dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
ddp->pool = NULL;
}
}
/**
* i40e_fcoe_ddp_clear - clear the given SW DDP context
* @ddp - SW DDP context
**/
static inline void i40e_fcoe_ddp_clear(struct i40e_fcoe_ddp *ddp)
{
memset(ddp, 0, sizeof(struct i40e_fcoe_ddp));
ddp->xid = FC_XID_UNKNOWN;
ddp->flags = __I40E_FCOE_DDP_NONE;
}
/**
* i40e_fcoe_progid_is_fcoe - check if the prog_id is for FCoE
* @id: the prog id for the programming status Rx descriptor write-back
**/
static inline bool i40e_fcoe_progid_is_fcoe(u8 id)
{
return (id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_PROG_STATUS) ||
(id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_INVL_STATUS);
}
/**
* i40e_fcoe_fc_get_xid - get xid from the frame header
* @fh: the fc frame header
*
* In case the incoming frame's exchange is originated from
* the initiator, then received frame's exchange id is ANDed
* with fc_cpu_mask bits to get the same cpu on which exchange
* was originated, otherwise just use the current cpu.
*
* Returns ox_id if exchange originator, rx_id if responder
**/
static inline u16 i40e_fcoe_fc_get_xid(struct fc_frame_header *fh)
{
u32 f_ctl = ntoh24(fh->fh_f_ctl);
return (f_ctl & FC_FC_EX_CTX) ?
be16_to_cpu(fh->fh_ox_id) :
be16_to_cpu(fh->fh_rx_id);
}
/**
* i40e_fcoe_fc_frame_header - get fc frame header from skb
* @skb: packet
*
* This checks if there is a VLAN header and returns the data
* pointer to the start of the fc_frame_header.
*
* Returns pointer to the fc_frame_header
**/
static inline struct fc_frame_header *i40e_fcoe_fc_frame_header(
struct sk_buff *skb)
{
void *fh = skb->data + sizeof(struct fcoe_hdr);
if (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q))
fh += sizeof(struct vlan_hdr);
return (struct fc_frame_header *)fh;
}
/**
* i40e_fcoe_ddp_put - release the DDP context for a given exchange id
* @netdev: the corresponding net_device
* @xid: the exchange id that corresponding DDP context will be released
*
* This is the implementation of net_device_ops.ndo_fcoe_ddp_done
* and it is expected to be called by ULD, i.e., FCP layer of libfc
* to release the corresponding ddp context when the I/O is done.
*
* Returns : data length already ddp-ed in bytes
**/
static int i40e_fcoe_ddp_put(struct net_device *netdev, u16 xid)
{
struct i40e_netdev_priv *np = netdev_priv(netdev);
struct i40e_pf *pf = np->vsi->back;
struct i40e_fcoe *fcoe = &pf->fcoe;
int len = 0;
struct i40e_fcoe_ddp *ddp = &fcoe->ddp[xid];
if (!fcoe || !ddp)
goto out;
if (test_bit(__I40E_FCOE_DDP_DONE, &ddp->flags))
len = ddp->len;
i40e_fcoe_ddp_unmap(pf, ddp);
out:
return len;
}
/**
* i40e_fcoe_sw_init - sets up the HW for FCoE
* @pf: pointer to PF
**/
void i40e_init_pf_fcoe(struct i40e_pf *pf)
{
struct i40e_hw *hw = &pf->hw;
u32 val;
pf->flags &= ~I40E_FLAG_FCOE_ENABLED;
pf->num_fcoe_qps = 0;
pf->fcoe_hmc_cntx_num = 0;
pf->fcoe_hmc_filt_num = 0;
if (!pf->hw.func_caps.fcoe) {
dev_dbg(&pf->pdev->dev, "FCoE capability is disabled\n");
return;
}
if (!pf->hw.func_caps.dcb) {
dev_warn(&pf->pdev->dev,
"Hardware is not DCB capable not enabling FCoE.\n");
return;
}
/* enable FCoE hash filter */
val = i40e_read_rx_ctl(hw, I40E_PFQF_HENA(1));
val |= BIT(I40E_FILTER_PCTYPE_FCOE_OX - 32);
val |= BIT(I40E_FILTER_PCTYPE_FCOE_RX - 32);
val &= I40E_PFQF_HENA_PTYPE_ENA_MASK;
i40e_write_rx_ctl(hw, I40E_PFQF_HENA(1), val);
/* enable flag */
pf->flags |= I40E_FLAG_FCOE_ENABLED;
pf->num_fcoe_qps = I40E_DEFAULT_FCOE;
/* Reserve 4K DDP contexts and 20K filter size for FCoE */
pf->fcoe_hmc_cntx_num = BIT(I40E_DMA_CNTX_SIZE_4K) *
I40E_DMA_CNTX_BASE_SIZE;
pf->fcoe_hmc_filt_num = pf->fcoe_hmc_cntx_num +
BIT(I40E_HASH_FILTER_SIZE_16K) *
I40E_HASH_FILTER_BASE_SIZE;
/* FCoE object: max 16K filter buckets and 4K DMA contexts */
pf->filter_settings.fcoe_filt_num = I40E_HASH_FILTER_SIZE_16K;
pf->filter_settings.fcoe_cntx_num = I40E_DMA_CNTX_SIZE_4K;
/* Setup max frame with FCoE_MTU plus L2 overheads */
val = i40e_read_rx_ctl(hw, I40E_GLFCOE_RCTL);
val &= ~I40E_GLFCOE_RCTL_MAX_SIZE_MASK;
val |= ((FCOE_MTU + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN)
<< I40E_GLFCOE_RCTL_MAX_SIZE_SHIFT);
i40e_write_rx_ctl(hw, I40E_GLFCOE_RCTL, val);
dev_info(&pf->pdev->dev, "FCoE is supported.\n");
}
/**
* i40e_get_fcoe_tc_map - Return TC map for FCoE APP
* @pf: pointer to PF
*
**/
u8 i40e_get_fcoe_tc_map(struct i40e_pf *pf)
{
struct i40e_dcb_app_priority_table app;
struct i40e_hw *hw = &pf->hw;
u8 enabled_tc = 0;
u8 tc, i;
/* Get the FCoE APP TLV */
struct i40e_dcbx_config *dcbcfg = &hw->local_dcbx_config;
for (i = 0; i < dcbcfg->numapps; i++) {
app = dcbcfg->app[i];
if (app.selector == IEEE_8021QAZ_APP_SEL_ETHERTYPE &&
app.protocolid == ETH_P_FCOE) {
tc = dcbcfg->etscfg.prioritytable[app.priority];
enabled_tc |= BIT(tc);
break;
}
}
/* TC0 if there is no TC defined for FCoE APP TLV */
enabled_tc = enabled_tc ? enabled_tc : 0x1;
return enabled_tc;
}
/**
* i40e_fcoe_vsi_init - prepares the VSI context for creating a FCoE VSI
* @vsi: pointer to the associated VSI struct
* @ctxt: pointer to the associated VSI context to be passed to HW
*
* Returns 0 on success or < 0 on error
**/
int i40e_fcoe_vsi_init(struct i40e_vsi *vsi, struct i40e_vsi_context *ctxt)
{
struct i40e_aqc_vsi_properties_data *info = &ctxt->info;
struct i40e_pf *pf = vsi->back;
struct i40e_hw *hw = &pf->hw;
u8 enabled_tc = 0;
if (!(pf->flags & I40E_FLAG_FCOE_ENABLED)) {
dev_err(&pf->pdev->dev,
"FCoE is not enabled for this device\n");
return -EPERM;
}
/* initialize the hardware for FCoE */
ctxt->pf_num = hw->pf_id;
ctxt->vf_num = 0;
ctxt->uplink_seid = vsi->uplink_seid;
ctxt->connection_type = I40E_AQ_VSI_CONN_TYPE_NORMAL;
ctxt->flags = I40E_AQ_VSI_TYPE_PF;
/* FCoE VSI would need the following sections */
info->valid_sections |= cpu_to_le16(I40E_AQ_VSI_PROP_QUEUE_OPT_VALID);
/* FCoE VSI does not need these sections */
info->valid_sections &= cpu_to_le16(~(I40E_AQ_VSI_PROP_SECURITY_VALID |
I40E_AQ_VSI_PROP_VLAN_VALID |
I40E_AQ_VSI_PROP_CAS_PV_VALID |
I40E_AQ_VSI_PROP_INGRESS_UP_VALID |
I40E_AQ_VSI_PROP_EGRESS_UP_VALID));
if (i40e_is_vsi_uplink_mode_veb(vsi)) {
info->valid_sections |=
cpu_to_le16(I40E_AQ_VSI_PROP_SWITCH_VALID);
info->switch_id =
cpu_to_le16(I40E_AQ_VSI_SW_ID_FLAG_ALLOW_LB);
}
enabled_tc = i40e_get_fcoe_tc_map(pf);
i40e_vsi_setup_queue_map(vsi, ctxt, enabled_tc, true);
/* set up queue option section: only enable FCoE */
info->queueing_opt_flags = I40E_AQ_VSI_QUE_OPT_FCOE_ENA;
return 0;
}
/**
* i40e_fcoe_enable - this is the implementation of ndo_fcoe_enable,
* indicating the upper FCoE protocol stack is ready to use FCoE
* offload features.
*
* @netdev: pointer to the netdev that FCoE is created on
*
* Returns 0 on success
*
* in RTNL
*
**/
int i40e_fcoe_enable(struct net_device *netdev)
{
struct i40e_netdev_priv *np = netdev_priv(netdev);
struct i40e_vsi *vsi = np->vsi;
struct i40e_pf *pf = vsi->back;
struct i40e_fcoe *fcoe = &pf->fcoe;
if (!(pf->flags & I40E_FLAG_FCOE_ENABLED)) {
netdev_err(netdev, "HW does not support FCoE.\n");
return -ENODEV;
}
if (vsi->type != I40E_VSI_FCOE) {
netdev_err(netdev, "interface does not support FCoE.\n");
return -EBUSY;
}
atomic_inc(&fcoe->refcnt);
return 0;
}
/**
* i40e_fcoe_disable- disables FCoE for upper FCoE protocol stack.
* @dev: pointer to the netdev that FCoE is created on
*
* Returns 0 on success
*
**/
int i40e_fcoe_disable(struct net_device *netdev)
{
struct i40e_netdev_priv *np = netdev_priv(netdev);
struct i40e_vsi *vsi = np->vsi;
struct i40e_pf *pf = vsi->back;
struct i40e_fcoe *fcoe = &pf->fcoe;
if (!(pf->flags & I40E_FLAG_FCOE_ENABLED)) {
netdev_err(netdev, "device does not support FCoE\n");
return -ENODEV;
}
if (vsi->type != I40E_VSI_FCOE)
return -EBUSY;
if (!atomic_dec_and_test(&fcoe->refcnt))
return -EINVAL;
netdev_info(netdev, "FCoE disabled\n");
return 0;
}
/**
* i40e_fcoe_dma_pool_free - free the per cpu pool for FCoE DDP
* @fcoe: the FCoE sw object
* @dev: the device that the pool is associated with
* @cpu: the cpu for this pool
*
**/
static void i40e_fcoe_dma_pool_free(struct i40e_fcoe *fcoe,
struct device *dev,
unsigned int cpu)
{
struct i40e_fcoe_ddp_pool *ddp_pool;
ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
if (!ddp_pool->pool) {
dev_warn(dev, "DDP pool already freed for cpu %d\n", cpu);
return;
}
dma_pool_destroy(ddp_pool->pool);
ddp_pool->pool = NULL;
}
/**
* i40e_fcoe_dma_pool_create - per cpu pool for FCoE DDP
* @fcoe: the FCoE sw object
* @dev: the device that the pool is associated with
* @cpu: the cpu for this pool
*
* Returns 0 on successful or non zero on failure
*
**/
static int i40e_fcoe_dma_pool_create(struct i40e_fcoe *fcoe,
struct device *dev,
unsigned int cpu)
{
struct i40e_fcoe_ddp_pool *ddp_pool;
struct dma_pool *pool;
char pool_name[32];
ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
if (ddp_pool && ddp_pool->pool) {
dev_warn(dev, "DDP pool already allocated for cpu %d\n", cpu);
return 0;
}
snprintf(pool_name, sizeof(pool_name), "i40e_fcoe_ddp_%d", cpu);
pool = dma_pool_create(pool_name, dev, I40E_FCOE_DDP_PTR_MAX,
I40E_FCOE_DDP_PTR_ALIGN, PAGE_SIZE);
if (!pool) {
dev_err(dev, "dma_pool_create %s failed\n", pool_name);
return -ENOMEM;
}
ddp_pool->pool = pool;
return 0;
}
/**
* i40e_fcoe_free_ddp_resources - release FCoE DDP resources
* @vsi: the vsi FCoE is associated with
*
**/
void i40e_fcoe_free_ddp_resources(struct i40e_vsi *vsi)
{
struct i40e_pf *pf = vsi->back;
struct i40e_fcoe *fcoe = &pf->fcoe;
int cpu, i;
/* do nothing if not FCoE VSI */
if (vsi->type != I40E_VSI_FCOE)
return;
/* do nothing if no DDP pools were allocated */
if (!fcoe->ddp_pool)
return;
for (i = 0; i < I40E_FCOE_DDP_MAX; i++)
i40e_fcoe_ddp_put(vsi->netdev, i);
for_each_possible_cpu(cpu)
i40e_fcoe_dma_pool_free(fcoe, &pf->pdev->dev, cpu);
free_percpu(fcoe->ddp_pool);
fcoe->ddp_pool = NULL;
netdev_info(vsi->netdev, "VSI %d,%d FCoE DDP resources released\n",
vsi->id, vsi->seid);
}
/**
* i40e_fcoe_setup_ddp_resources - allocate per cpu DDP resources
* @vsi: the VSI FCoE is associated with
*
* Returns 0 on successful or non zero on failure
*
**/
int i40e_fcoe_setup_ddp_resources(struct i40e_vsi *vsi)
{
struct i40e_pf *pf = vsi->back;
struct device *dev = &pf->pdev->dev;
struct i40e_fcoe *fcoe = &pf->fcoe;
unsigned int cpu;
int i;
if (vsi->type != I40E_VSI_FCOE)
return -ENODEV;
/* do nothing if no DDP pools were allocated */
if (fcoe->ddp_pool)
return -EEXIST;
/* allocate per CPU memory to track DDP pools */
fcoe->ddp_pool = alloc_percpu(struct i40e_fcoe_ddp_pool);
if (!fcoe->ddp_pool) {
dev_err(&pf->pdev->dev, "failed to allocate percpu DDP\n");
return -ENOMEM;
}
/* allocate pci pool for each cpu */
for_each_possible_cpu(cpu) {
if (!i40e_fcoe_dma_pool_create(fcoe, dev, cpu))
continue;
dev_err(dev, "failed to alloc DDP pool on cpu:%d\n", cpu);
i40e_fcoe_free_ddp_resources(vsi);
return -ENOMEM;
}
/* initialize the sw context */
for (i = 0; i < I40E_FCOE_DDP_MAX; i++)
i40e_fcoe_ddp_clear(&fcoe->ddp[i]);
netdev_info(vsi->netdev, "VSI %d,%d FCoE DDP resources allocated\n",
vsi->id, vsi->seid);
return 0;
}
/**
* i40e_fcoe_handle_status - check the Programming Status for FCoE
* @rx_ring: the Rx ring for this descriptor
* @rx_desc: the Rx descriptor for Programming Status, not a packet descriptor.
*
* Check if this is the Rx Programming Status descriptor write-back for FCoE.
* This is used to verify if the context/filter programming or invalidation
* requested by SW to the HW is successful or not and take actions accordingly.
**/
void i40e_fcoe_handle_status(struct i40e_ring *rx_ring,
union i40e_rx_desc *rx_desc, u8 prog_id)
{
struct i40e_pf *pf = rx_ring->vsi->back;
struct i40e_fcoe *fcoe = &pf->fcoe;
struct i40e_fcoe_ddp *ddp;
u32 error;
u16 xid;
u64 qw;
/* we only care for FCoE here */
if (!i40e_fcoe_progid_is_fcoe(prog_id))
return;
xid = le32_to_cpu(rx_desc->wb.qword0.hi_dword.fcoe_param) &
(I40E_FCOE_DDP_MAX - 1);
if (!i40e_fcoe_xid_is_valid(xid))
return;
ddp = &fcoe->ddp[xid];
WARN_ON(xid != ddp->xid);
qw = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
error = (qw & I40E_RX_PROG_STATUS_DESC_QW1_ERROR_MASK) >>
I40E_RX_PROG_STATUS_DESC_QW1_ERROR_SHIFT;
/* DDP context programming status: failure or success */
if (prog_id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_PROG_STATUS) {
if (I40E_RX_PROG_FCOE_ERROR_TBL_FULL(error)) {
dev_err(&pf->pdev->dev, "xid %x ddp->xid %x TABLE FULL\n",
xid, ddp->xid);
ddp->prerr |= I40E_RX_PROG_FCOE_ERROR_TBL_FULL_BIT;
}
if (I40E_RX_PROG_FCOE_ERROR_CONFLICT(error)) {
dev_err(&pf->pdev->dev, "xid %x ddp->xid %x CONFLICT\n",
xid, ddp->xid);
ddp->prerr |= I40E_RX_PROG_FCOE_ERROR_CONFLICT_BIT;
}
}
/* DDP context invalidation status: failure or success */
if (prog_id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_INVL_STATUS) {
if (I40E_RX_PROG_FCOE_ERROR_INVLFAIL(error)) {
dev_err(&pf->pdev->dev, "xid %x ddp->xid %x INVALIDATION FAILURE\n",
xid, ddp->xid);
ddp->prerr |= I40E_RX_PROG_FCOE_ERROR_INVLFAIL_BIT;
}
/* clear the flag so we can retry invalidation */
clear_bit(__I40E_FCOE_DDP_ABORTED, &ddp->flags);
}
/* unmap DMA */
i40e_fcoe_ddp_unmap(pf, ddp);
i40e_fcoe_ddp_clear(ddp);
}
/**
* i40e_fcoe_handle_offload - check ddp status and mark it done
* @adapter: i40e adapter
* @rx_desc: advanced rx descriptor
* @skb: the skb holding the received data
*
* This checks ddp status.
*
* Returns : < 0 indicates an error or not a FCOE ddp, 0 indicates
* not passing the skb to ULD, > 0 indicates is the length of data
* being ddped.
*
**/
int i40e_fcoe_handle_offload(struct i40e_ring *rx_ring,
union i40e_rx_desc *rx_desc,
struct sk_buff *skb)
{
struct i40e_pf *pf = rx_ring->vsi->back;
struct i40e_fcoe *fcoe = &pf->fcoe;
struct fc_frame_header *fh = NULL;
struct i40e_fcoe_ddp *ddp = NULL;
u32 status, fltstat;
u32 error, fcerr;
int rc = -EINVAL;
u16 ptype;
u16 xid;
u64 qw;
/* check this rxd is for programming status */
qw = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
/* packet descriptor, check packet type */
ptype = (qw & I40E_RXD_QW1_PTYPE_MASK) >> I40E_RXD_QW1_PTYPE_SHIFT;
if (!i40e_rx_is_fcoe(ptype))
goto out_no_ddp;
error = (qw & I40E_RXD_QW1_ERROR_MASK) >> I40E_RXD_QW1_ERROR_SHIFT;
fcerr = (error >> I40E_RX_DESC_ERROR_L3L4E_SHIFT) &
I40E_RX_DESC_FCOE_ERROR_MASK;
/* check stateless offload error */
if (unlikely(fcerr == I40E_RX_DESC_ERROR_L3L4E_PROT)) {
dev_err(&pf->pdev->dev, "Protocol Error\n");
skb->ip_summed = CHECKSUM_NONE;
} else {
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
/* check hw status on ddp */
status = (qw & I40E_RXD_QW1_STATUS_MASK) >> I40E_RXD_QW1_STATUS_SHIFT;
fltstat = (status >> I40E_RX_DESC_STATUS_FLTSTAT_SHIFT) &
I40E_RX_DESC_FLTSTAT_FCMASK;
/* now we are ready to check DDP */
fh = i40e_fcoe_fc_frame_header(skb);
xid = i40e_fcoe_fc_get_xid(fh);
if (!i40e_fcoe_xid_is_valid(xid))
goto out_no_ddp;
/* non DDP normal receive, return to the protocol stack */
if (fltstat == I40E_RX_DESC_FLTSTAT_NOMTCH)
goto out_no_ddp;
/* do we have a sw ddp context setup ? */
ddp = &fcoe->ddp[xid];
if (!ddp->sgl)
goto out_no_ddp;
/* fetch xid from hw rxd wb, which should match up the sw ctxt */
xid = le16_to_cpu(rx_desc->wb.qword0.lo_dword.mirr_fcoe.fcoe_ctx_id);
if (ddp->xid != xid) {
dev_err(&pf->pdev->dev, "xid 0x%x does not match ctx_xid 0x%x\n",
ddp->xid, xid);
goto out_put_ddp;
}
/* the same exchange has already errored out */
if (ddp->fcerr) {
dev_err(&pf->pdev->dev, "xid 0x%x fcerr 0x%x reported fcer 0x%x\n",
xid, ddp->fcerr, fcerr);
goto out_put_ddp;
}
/* fcoe param is valid by now with correct DDPed length */
ddp->len = le32_to_cpu(rx_desc->wb.qword0.hi_dword.fcoe_param);
ddp->fcerr = fcerr;
/* header posting only, useful only for target mode and debugging */
if (fltstat == I40E_RX_DESC_FLTSTAT_DDP) {
/* For target mode, we get header of the last packet but it
* does not have the FCoE trailer field, i.e., CRC and EOF
* Ordered Set since they are offloaded by the HW, so fill
* it up correspondingly to allow the packet to pass through
* to the upper protocol stack.
*/
u32 f_ctl = ntoh24(fh->fh_f_ctl);
if ((f_ctl & FC_FC_END_SEQ) &&
(fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA)) {
struct fcoe_crc_eof *crc = NULL;
crc = skb_put(skb, sizeof(*crc));
crc->fcoe_eof = FC_EOF_T;
} else {
/* otherwise, drop the header only frame */
rc = 0;
goto out_no_ddp;
}
}
out_put_ddp:
/* either we got RSP or we have an error, unmap DMA in both cases */
i40e_fcoe_ddp_unmap(pf, ddp);
if (ddp->len && !ddp->fcerr) {
int pkts;
rc = ddp->len;
i40e_fcoe_ddp_clear(ddp);
ddp->len = rc;
pkts = DIV_ROUND_UP(rc, 2048);
rx_ring->stats.bytes += rc;
rx_ring->stats.packets += pkts;
rx_ring->q_vector->rx.total_bytes += rc;
rx_ring->q_vector->rx.total_packets += pkts;
set_bit(__I40E_FCOE_DDP_DONE, &ddp->flags);
}
out_no_ddp:
return rc;
}
/**
* i40e_fcoe_ddp_setup - called to set up ddp context
* @netdev: the corresponding net_device
* @xid: the exchange id requesting ddp
* @sgl: the scatter-gather list for this request
* @sgc: the number of scatter-gather items
* @target_mode: indicates this is a DDP request for target
*
* Returns : 1 for success and 0 for no DDP on this I/O
**/
static int i40e_fcoe_ddp_setup(struct net_device *netdev, u16 xid,
struct scatterlist *sgl, unsigned int sgc,
int target_mode)
{
static const unsigned int bufflen = I40E_FCOE_DDP_BUF_MIN;
struct i40e_netdev_priv *np = netdev_priv(netdev);
struct i40e_fcoe_ddp_pool *ddp_pool;
struct i40e_pf *pf = np->vsi->back;
struct i40e_fcoe *fcoe = &pf->fcoe;
unsigned int i, j, dmacount;
struct i40e_fcoe_ddp *ddp;
unsigned int firstoff = 0;
unsigned int thisoff = 0;
unsigned int thislen = 0;
struct scatterlist *sg;
dma_addr_t addr = 0;
unsigned int len;
if (xid >= I40E_FCOE_DDP_MAX) {
dev_warn(&pf->pdev->dev, "xid=0x%x out-of-range\n", xid);
return 0;
}
/* no DDP if we are already down or resetting */
if (test_bit(__I40E_DOWN, &pf->state) ||
test_bit(__I40E_NEEDS_RESTART, &pf->state)) {
dev_info(&pf->pdev->dev, "xid=0x%x device in reset/down\n",
xid);
return 0;
}
ddp = &fcoe->ddp[xid];
if (ddp->sgl) {
dev_info(&pf->pdev->dev, "xid 0x%x w/ non-null sgl=%p nents=%d\n",
xid, ddp->sgl, ddp->sgc);
return 0;
}
i40e_fcoe_ddp_clear(ddp);
if (!fcoe->ddp_pool) {
dev_info(&pf->pdev->dev, "No DDP pool, xid 0x%x\n", xid);
return 0;
}
ddp_pool = per_cpu_ptr(fcoe->ddp_pool, get_cpu());
if (!ddp_pool->pool) {
dev_info(&pf->pdev->dev, "No percpu ddp pool, xid 0x%x\n", xid);
goto out_noddp;
}
/* setup dma from scsi command sgl */
dmacount = dma_map_sg(&pf->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
if (dmacount == 0) {
dev_info(&pf->pdev->dev, "dma_map_sg for sgl %p, sgc %d failed\n",
sgl, sgc);
goto out_noddp_unmap;
}
/* alloc the udl from our ddp pool */
ddp->udl = dma_pool_alloc(ddp_pool->pool, GFP_ATOMIC, &ddp->udp);
if (!ddp->udl) {
dev_info(&pf->pdev->dev,
"Failed allocated ddp context, xid 0x%x\n", xid);
goto out_noddp_unmap;
}
j = 0;
ddp->len = 0;
for_each_sg(sgl, sg, dmacount, i) {
addr = sg_dma_address(sg);
len = sg_dma_len(sg);
ddp->len += len;
while (len) {
/* max number of buffers allowed in one DDP context */
if (j >= I40E_FCOE_DDP_BUFFCNT_MAX) {
dev_info(&pf->pdev->dev,
"xid=%x:%d,%d,%d:addr=%llx not enough descriptors\n",
xid, i, j, dmacount, (u64)addr);
goto out_noddp_free;
}
/* get the offset of length of current buffer */
thisoff = addr & ((dma_addr_t)bufflen - 1);
thislen = min_t(unsigned int, (bufflen - thisoff), len);
/* all but the 1st buffer (j == 0)
* must be aligned on bufflen
*/
if ((j != 0) && (thisoff))
goto out_noddp_free;
/* all but the last buffer
* ((i == (dmacount - 1)) && (thislen == len))
* must end at bufflen
*/
if (((i != (dmacount - 1)) || (thislen != len)) &&
((thislen + thisoff) != bufflen))
goto out_noddp_free;
ddp->udl[j] = (u64)(addr - thisoff);
/* only the first buffer may have none-zero offset */
if (j == 0)
firstoff = thisoff;
len -= thislen;
addr += thislen;
j++;
}
}
/* only the last buffer may have non-full bufflen */
ddp->lastsize = thisoff + thislen;
ddp->firstoff = firstoff;
ddp->list_len = j;
ddp->pool = ddp_pool->pool;
ddp->sgl = sgl;
ddp->sgc = sgc;
ddp->xid = xid;
if (target_mode)
set_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags);
set_bit(__I40E_FCOE_DDP_INITALIZED, &ddp->flags);
put_cpu();
return 1; /* Success */
out_noddp_free:
dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
i40e_fcoe_ddp_clear(ddp);
out_noddp_unmap:
dma_unmap_sg(&pf->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
out_noddp:
put_cpu();
return 0;
}
/**
* i40e_fcoe_ddp_get - called to set up ddp context in initiator mode
* @netdev: the corresponding net_device
* @xid: the exchange id requesting ddp
* @sgl: the scatter-gather list for this request
* @sgc: the number of scatter-gather items
*
* This is the implementation of net_device_ops.ndo_fcoe_ddp_setup
* and is expected to be called from ULD, e.g., FCP layer of libfc
* to set up ddp for the corresponding xid of the given sglist for
* the corresponding I/O.
*
* Returns : 1 for success and 0 for no ddp
**/
static int i40e_fcoe_ddp_get(struct net_device *netdev, u16 xid,
struct scatterlist *sgl, unsigned int sgc)
{
return i40e_fcoe_ddp_setup(netdev, xid, sgl, sgc, 0);
}
/**
* i40e_fcoe_ddp_target - called to set up ddp context in target mode
* @netdev: the corresponding net_device
* @xid: the exchange id requesting ddp
* @sgl: the scatter-gather list for this request
* @sgc: the number of scatter-gather items
*
* This is the implementation of net_device_ops.ndo_fcoe_ddp_target
* and is expected to be called from ULD, e.g., FCP layer of libfc
* to set up ddp for the corresponding xid of the given sglist for
* the corresponding I/O. The DDP in target mode is a write I/O request
* from the initiator.
*
* Returns : 1 for success and 0 for no ddp
**/
static int i40e_fcoe_ddp_target(struct net_device *netdev, u16 xid,
struct scatterlist *sgl, unsigned int sgc)
{
return i40e_fcoe_ddp_setup(netdev, xid, sgl, sgc, 1);
}
/**
* i40e_fcoe_program_ddp - programs the HW DDP related descriptors
* @tx_ring: transmit ring for this packet
* @skb: the packet to be sent out
* @sof: the SOF to indicate class of service
*
* Determine if it is READ/WRITE command, and finds out if there is
* a matching SW DDP context for this command. DDP is applicable
* only in case of READ if initiator or WRITE in case of
* responder (via checking XFER_RDY).
*
* Note: caller checks sof and ddp sw context
*
* Returns : none
*
**/
static void i40e_fcoe_program_ddp(struct i40e_ring *tx_ring,
struct sk_buff *skb,
struct i40e_fcoe_ddp *ddp, u8 sof)
{
struct i40e_fcoe_filter_context_desc *filter_desc = NULL;
struct i40e_fcoe_queue_context_desc *queue_desc = NULL;
struct i40e_fcoe_ddp_context_desc *ddp_desc = NULL;
struct i40e_pf *pf = tx_ring->vsi->back;
u16 i = tx_ring->next_to_use;
struct fc_frame_header *fh;
u64 flags_rsvd_lanq = 0;
bool target_mode;
/* check if abort is still pending */
if (test_bit(__I40E_FCOE_DDP_ABORTED, &ddp->flags)) {
dev_warn(&pf->pdev->dev,
"DDP abort is still pending xid:%hx and ddp->flags:%lx:\n",
ddp->xid, ddp->flags);
return;
}
/* set the flag to indicate this is programmed */
if (test_and_set_bit(__I40E_FCOE_DDP_PROGRAMMED, &ddp->flags)) {
dev_warn(&pf->pdev->dev,
"DDP is already programmed for xid:%hx and ddp->flags:%lx:\n",
ddp->xid, ddp->flags);
return;
}
/* Prepare the DDP context descriptor */
ddp_desc = I40E_DDP_CONTEXT_DESC(tx_ring, i);
i++;
if (i == tx_ring->count)
i = 0;
ddp_desc->type_cmd_foff_lsize =
cpu_to_le64(I40E_TX_DESC_DTYPE_DDP_CTX |
((u64)I40E_FCOE_DDP_CTX_DESC_BSIZE_4K <<
I40E_FCOE_DDP_CTX_QW1_CMD_SHIFT) |
((u64)ddp->firstoff <<
I40E_FCOE_DDP_CTX_QW1_FOFF_SHIFT) |
((u64)ddp->lastsize <<
I40E_FCOE_DDP_CTX_QW1_LSIZE_SHIFT));
ddp_desc->rsvd = cpu_to_le64(0);
/* target mode needs last packet in the sequence */
target_mode = test_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags);
if (target_mode)
ddp_desc->type_cmd_foff_lsize |=
cpu_to_le64(I40E_FCOE_DDP_CTX_DESC_LASTSEQH);
/* Prepare queue_context descriptor */
queue_desc = I40E_QUEUE_CONTEXT_DESC(tx_ring, i++);
if (i == tx_ring->count)
i = 0;
queue_desc->dmaindx_fbase = cpu_to_le64(ddp->xid | ((u64)ddp->udp));
queue_desc->flen_tph = cpu_to_le64(ddp->list_len |
((u64)(I40E_FCOE_QUEUE_CTX_DESC_TPHRDESC |
I40E_FCOE_QUEUE_CTX_DESC_TPHDATA) <<
I40E_FCOE_QUEUE_CTX_QW1_TPH_SHIFT));
/* Prepare filter_context_desc */
filter_desc = I40E_FILTER_CONTEXT_DESC(tx_ring, i);
i++;
if (i == tx_ring->count)
i = 0;
fh = (struct fc_frame_header *)skb_transport_header(skb);
filter_desc->param = cpu_to_le32(ntohl(fh->fh_parm_offset));
filter_desc->seqn = cpu_to_le16(ntohs(fh->fh_seq_cnt));
filter_desc->rsvd_dmaindx = cpu_to_le16(ddp->xid <<
I40E_FCOE_FILTER_CTX_QW0_DMAINDX_SHIFT);
flags_rsvd_lanq = I40E_FCOE_FILTER_CTX_DESC_CTYP_DDP;
flags_rsvd_lanq |= (u64)(target_mode ?
I40E_FCOE_FILTER_CTX_DESC_ENODE_RSP :
I40E_FCOE_FILTER_CTX_DESC_ENODE_INIT);
flags_rsvd_lanq |= (u64)((sof == FC_SOF_I2 || sof == FC_SOF_N2) ?
I40E_FCOE_FILTER_CTX_DESC_FC_CLASS2 :
I40E_FCOE_FILTER_CTX_DESC_FC_CLASS3);
flags_rsvd_lanq |= ((u64)skb->queue_mapping <<
I40E_FCOE_FILTER_CTX_QW1_LANQINDX_SHIFT);
filter_desc->flags_rsvd_lanq = cpu_to_le64(flags_rsvd_lanq);
/* By this time, all offload related descriptors has been programmed */
tx_ring->next_to_use = i;
}
/**
* i40e_fcoe_invalidate_ddp - invalidates DDP in case of abort
* @tx_ring: transmit ring for this packet
* @skb: the packet associated w/ this DDP invalidation, i.e., ABTS
* @ddp: the SW DDP context for this DDP
*
* Programs the Tx context descriptor to do DDP invalidation.
**/
static void i40e_fcoe_invalidate_ddp(struct i40e_ring *tx_ring,
struct sk_buff *skb,
struct i40e_fcoe_ddp *ddp)
{
struct i40e_tx_context_desc *context_desc;
int i;
if (test_and_set_bit(__I40E_FCOE_DDP_ABORTED, &ddp->flags))
return;
i = tx_ring->next_to_use;
context_desc = I40E_TX_CTXTDESC(tx_ring, i);
i++;
if (i == tx_ring->count)
i = 0;
context_desc->tunneling_params = cpu_to_le32(0);
context_desc->l2tag2 = cpu_to_le16(0);
context_desc->rsvd = cpu_to_le16(0);
context_desc->type_cmd_tso_mss = cpu_to_le64(
I40E_TX_DESC_DTYPE_FCOE_CTX |
(I40E_FCOE_TX_CTX_DESC_OPCODE_DDP_CTX_INVL <<
I40E_TXD_CTX_QW1_CMD_SHIFT) |
(I40E_FCOE_TX_CTX_DESC_OPCODE_SINGLE_SEND <<
I40E_TXD_CTX_QW1_CMD_SHIFT));
tx_ring->next_to_use = i;
}
/**
* i40e_fcoe_handle_ddp - check we should setup or invalidate DDP
* @tx_ring: transmit ring for this packet
* @skb: the packet to be sent out
* @sof: the SOF to indicate class of service
*
* Determine if it is ABTS/READ/XFER_RDY, and finds out if there is
* a matching SW DDP context for this command. DDP is applicable
* only in case of READ if initiator or WRITE in case of
* responder (via checking XFER_RDY). In case this is an ABTS, send
* just invalidate the context.
**/
static void i40e_fcoe_handle_ddp(struct i40e_ring *tx_ring,
struct sk_buff *skb, u8 sof)
{
struct i40e_pf *pf = tx_ring->vsi->back;
struct i40e_fcoe *fcoe = &pf->fcoe;
struct fc_frame_header *fh;
struct i40e_fcoe_ddp *ddp;
u32 f_ctl;
u8 r_ctl;
u16 xid;
fh = (struct fc_frame_header *)skb_transport_header(skb);
f_ctl = ntoh24(fh->fh_f_ctl);
r_ctl = fh->fh_r_ctl;
ddp = NULL;
if ((r_ctl == FC_RCTL_DD_DATA_DESC) && (f_ctl & FC_FC_EX_CTX)) {
/* exchange responder? if so, XFER_RDY for write */
xid = ntohs(fh->fh_rx_id);
if (i40e_fcoe_xid_is_valid(xid)) {
ddp = &fcoe->ddp[xid];
if ((ddp->xid == xid) &&
(test_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags)))
i40e_fcoe_program_ddp(tx_ring, skb, ddp, sof);
}
} else if (r_ctl == FC_RCTL_DD_UNSOL_CMD) {
/* exchange originator, check READ cmd */
xid = ntohs(fh->fh_ox_id);
if (i40e_fcoe_xid_is_valid(xid)) {
ddp = &fcoe->ddp[xid];
if ((ddp->xid == xid) &&
(!test_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags)))
i40e_fcoe_program_ddp(tx_ring, skb, ddp, sof);
}
} else if (r_ctl == FC_RCTL_BA_ABTS) {
/* exchange originator, check ABTS */
xid = ntohs(fh->fh_ox_id);
if (i40e_fcoe_xid_is_valid(xid)) {
ddp = &fcoe->ddp[xid];
if ((ddp->xid == xid) &&
(!test_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags)))
i40e_fcoe_invalidate_ddp(tx_ring, skb, ddp);
}
}
}
/**
* i40e_fcoe_tso - set up FCoE TSO
* @tx_ring: ring to send buffer on
* @skb: send buffer
* @tx_flags: collected send information
* @hdr_len: the tso header length
* @sof: the SOF to indicate class of service
*
* Note must already have sof checked to be either class 2 or class 3 before
* calling this function.
*
* Returns 1 to indicate sequence segmentation offload is properly setup
* or returns 0 to indicate no tso is needed, otherwise returns error
* code to drop the frame.
**/
static int i40e_fcoe_tso(struct i40e_ring *tx_ring,
struct sk_buff *skb,
u32 tx_flags, u8 *hdr_len, u8 sof)
{
struct i40e_tx_context_desc *context_desc;
u32 cd_type, cd_cmd, cd_tso_len, cd_mss;
struct fc_frame_header *fh;
u64 cd_type_cmd_tso_mss;
/* must match gso type as FCoE */
if (!skb_is_gso(skb))
return 0;
/* is it the expected gso type for FCoE ?*/
if (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE) {
netdev_err(skb->dev,
"wrong gso type %d:expecting SKB_GSO_FCOE\n",
skb_shinfo(skb)->gso_type);
return -EINVAL;
}
/* header and trailer are inserted by hw */
*hdr_len = skb_transport_offset(skb) + sizeof(struct fc_frame_header) +
sizeof(struct fcoe_crc_eof);
/* check sof to decide a class 2 or 3 TSO */
if (likely(i40e_fcoe_sof_is_class3(sof)))
cd_cmd = I40E_FCOE_TX_CTX_DESC_OPCODE_TSO_FC_CLASS3;
else
cd_cmd = I40E_FCOE_TX_CTX_DESC_OPCODE_TSO_FC_CLASS2;
/* param field valid? */
fh = (struct fc_frame_header *)skb_transport_header(skb);
if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
cd_cmd |= I40E_FCOE_TX_CTX_DESC_RELOFF;
/* fill the field values */
cd_type = I40E_TX_DESC_DTYPE_FCOE_CTX;
cd_tso_len = skb->len - *hdr_len;
cd_mss = skb_shinfo(skb)->gso_size;
cd_type_cmd_tso_mss =
((u64)cd_type << I40E_TXD_CTX_QW1_DTYPE_SHIFT) |
((u64)cd_cmd << I40E_TXD_CTX_QW1_CMD_SHIFT) |
((u64)cd_tso_len << I40E_TXD_CTX_QW1_TSO_LEN_SHIFT) |
((u64)cd_mss << I40E_TXD_CTX_QW1_MSS_SHIFT);
/* grab the next descriptor */
context_desc = I40E_TX_CTXTDESC(tx_ring, tx_ring->next_to_use);
tx_ring->next_to_use++;
if (tx_ring->next_to_use == tx_ring->count)
tx_ring->next_to_use = 0;
context_desc->tunneling_params = 0;
context_desc->l2tag2 = cpu_to_le16((tx_flags & I40E_TX_FLAGS_VLAN_MASK)
>> I40E_TX_FLAGS_VLAN_SHIFT);
context_desc->type_cmd_tso_mss = cpu_to_le64(cd_type_cmd_tso_mss);
return 1;
}
/**
* i40e_fcoe_tx_map - build the tx descriptor
* @tx_ring: ring to send buffer on
* @skb: send buffer
* @first: first buffer info buffer to use
* @tx_flags: collected send information
* @hdr_len: ptr to the size of the packet header
* @eof: the frame eof value
*
* Note, for FCoE, sof and eof are already checked
**/
static void i40e_fcoe_tx_map(struct i40e_ring *tx_ring,
struct sk_buff *skb,
struct i40e_tx_buffer *first,
u32 tx_flags, u8 hdr_len, u8 eof)
{
u32 td_offset = 0;
u32 td_cmd = 0;
u32 maclen;
/* insert CRC */
td_cmd = I40E_TX_DESC_CMD_ICRC;
/* setup MACLEN */
maclen = skb_network_offset(skb);
if (tx_flags & I40E_TX_FLAGS_SW_VLAN)
maclen += sizeof(struct vlan_hdr);
if (skb->protocol == htons(ETH_P_FCOE)) {
/* for FCoE, maclen should exclude ether type */
maclen -= 2;
/* setup type as FCoE and EOF insertion */
td_cmd |= (I40E_TX_DESC_CMD_FCOET | i40e_fcoe_ctxt_eof(eof));
/* setup FCoELEN and FCLEN */
td_offset |= ((((sizeof(struct fcoe_hdr) + 2) >> 2) <<
I40E_TX_DESC_LENGTH_IPLEN_SHIFT) |
((sizeof(struct fc_frame_header) >> 2) <<
I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT));
/* trim to exclude trailer */
pskb_trim(skb, skb->len - sizeof(struct fcoe_crc_eof));
}
/* MACLEN is ether header length in words not bytes */
td_offset |= (maclen >> 1) << I40E_TX_DESC_LENGTH_MACLEN_SHIFT;
i40e_tx_map(tx_ring, skb, first, tx_flags, hdr_len, td_cmd, td_offset);
}
/**
* i40e_fcoe_set_skb_header - adjust skb header point for FIP/FCoE/FC
* @skb: the skb to be adjusted
*
* Returns true if this skb is a FCoE/FIP or VLAN carried FCoE/FIP and then
* adjusts the skb header pointers correspondingly. Otherwise, returns false.
**/
static inline int i40e_fcoe_set_skb_header(struct sk_buff *skb)
{
__be16 protocol = skb->protocol;
skb_reset_mac_header(skb);
skb->mac_len = sizeof(struct ethhdr);
if (protocol == htons(ETH_P_8021Q)) {
struct vlan_ethhdr *veth = (struct vlan_ethhdr *)eth_hdr(skb);
protocol = veth->h_vlan_encapsulated_proto;
skb->mac_len += sizeof(struct vlan_hdr);
}
/* FCoE or FIP only */
if ((protocol != htons(ETH_P_FIP)) &&
(protocol != htons(ETH_P_FCOE)))
return -EINVAL;
/* set header to L2 of FCoE/FIP */
skb_set_network_header(skb, skb->mac_len);
if (protocol == htons(ETH_P_FIP))
return 0;
/* set header to L3 of FC */
skb_set_transport_header(skb, skb->mac_len + sizeof(struct fcoe_hdr));
return 0;
}
/**
* i40e_fcoe_xmit_frame - transmit buffer
* @skb: send buffer
* @netdev: the fcoe netdev
*
* Returns 0 if sent, else an error code
**/
static netdev_tx_t i40e_fcoe_xmit_frame(struct sk_buff *skb,
struct net_device *netdev)
{
struct i40e_netdev_priv *np = netdev_priv(skb->dev);
struct i40e_vsi *vsi = np->vsi;
struct i40e_ring *tx_ring = vsi->tx_rings[skb->queue_mapping];
struct i40e_tx_buffer *first;
u32 tx_flags = 0;
int fso, count;
u8 hdr_len = 0;
u8 sof = 0;
u8 eof = 0;
if (i40e_fcoe_set_skb_header(skb))
goto out_drop;
count = i40e_xmit_descriptor_count(skb);
if (i40e_chk_linearize(skb, count)) {
if (__skb_linearize(skb))
goto out_drop;
count = i40e_txd_use_count(skb->len);
tx_ring->tx_stats.tx_linearize++;
}
/* need: 1 descriptor per page * PAGE_SIZE/I40E_MAX_DATA_PER_TXD,
* + 1 desc for skb_head_len/I40E_MAX_DATA_PER_TXD,
* + 4 desc gap to avoid the cache line where head is,
* + 1 desc for context descriptor,
* otherwise try next time
*/
if (i40e_maybe_stop_tx(tx_ring, count + 4 + 1)) {
tx_ring->tx_stats.tx_busy++;
return NETDEV_TX_BUSY;
}
/* prepare the xmit flags */
if (i40e_tx_prepare_vlan_flags(skb, tx_ring, &tx_flags))
goto out_drop;
/* record the location of the first descriptor for this packet */
first = &tx_ring->tx_bi[tx_ring->next_to_use];
/* FIP is a regular L2 traffic w/o offload */
if (skb->protocol == htons(ETH_P_FIP))
goto out_send;
/* check sof and eof, only supports FC Class 2 or 3 */
if (i40e_fcoe_fc_sof(skb, &sof) || i40e_fcoe_fc_eof(skb, &eof)) {
netdev_err(netdev, "SOF/EOF error:%02x - %02x\n", sof, eof);
goto out_drop;
}
/* always do FCCRC for FCoE */
tx_flags |= I40E_TX_FLAGS_FCCRC;
/* check we should do sequence offload */
fso = i40e_fcoe_tso(tx_ring, skb, tx_flags, &hdr_len, sof);
if (fso < 0)
goto out_drop;
else if (fso)
tx_flags |= I40E_TX_FLAGS_FSO;
else
i40e_fcoe_handle_ddp(tx_ring, skb, sof);
out_send:
/* send out the packet */
i40e_fcoe_tx_map(tx_ring, skb, first, tx_flags, hdr_len, eof);
i40e_maybe_stop_tx(tx_ring, DESC_NEEDED);
return NETDEV_TX_OK;
out_drop:
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
/**
* i40e_fcoe_change_mtu - NDO callback to change the Maximum Transfer Unit
* @netdev: network interface device structure
* @new_mtu: new value for maximum frame size
*
* Returns error as operation not permitted
*
**/
static int i40e_fcoe_change_mtu(struct net_device *netdev, int new_mtu)
{
netdev_warn(netdev, "MTU change is not supported on FCoE interfaces\n");
return -EPERM;
}
/**
* i40e_fcoe_set_features - set the netdev feature flags
* @netdev: ptr to the netdev being adjusted
* @features: the feature set that the stack is suggesting
*
**/
static int i40e_fcoe_set_features(struct net_device *netdev,
netdev_features_t features)
{
struct i40e_netdev_priv *np = netdev_priv(netdev);
struct i40e_vsi *vsi = np->vsi;
if (features & NETIF_F_HW_VLAN_CTAG_RX)
i40e_vlan_stripping_enable(vsi);
else
i40e_vlan_stripping_disable(vsi);
return 0;
}
static const struct net_device_ops i40e_fcoe_netdev_ops = {
.ndo_open = i40e_open,
.ndo_stop = i40e_close,
.ndo_get_stats64 = i40e_get_netdev_stats_struct,
.ndo_set_rx_mode = i40e_set_rx_mode,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = i40e_set_mac,
.ndo_change_mtu = i40e_fcoe_change_mtu,
.ndo_do_ioctl = i40e_ioctl,
.ndo_tx_timeout = i40e_tx_timeout,
.ndo_vlan_rx_add_vid = i40e_vlan_rx_add_vid,
.ndo_vlan_rx_kill_vid = i40e_vlan_rx_kill_vid,
.ndo_setup_tc = __i40e_setup_tc,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = i40e_netpoll,
#endif
.ndo_start_xmit = i40e_fcoe_xmit_frame,
.ndo_fcoe_enable = i40e_fcoe_enable,
.ndo_fcoe_disable = i40e_fcoe_disable,
.ndo_fcoe_ddp_setup = i40e_fcoe_ddp_get,
.ndo_fcoe_ddp_done = i40e_fcoe_ddp_put,
.ndo_fcoe_ddp_target = i40e_fcoe_ddp_target,
.ndo_set_features = i40e_fcoe_set_features,
};
/* fcoe network device type */
static struct device_type fcoe_netdev_type = {
.name = "fcoe",
};
/**
* i40e_fcoe_config_netdev - prepares the VSI context for creating a FCoE VSI
* @vsi: pointer to the associated VSI struct
* @ctxt: pointer to the associated VSI context to be passed to HW
*
* Returns 0 on success or < 0 on error
**/
void i40e_fcoe_config_netdev(struct net_device *netdev, struct i40e_vsi *vsi)
{
struct i40e_hw *hw = &vsi->back->hw;
struct i40e_pf *pf = vsi->back;
if (vsi->type != I40E_VSI_FCOE)
return;
netdev->features = (NETIF_F_HW_VLAN_CTAG_TX |
NETIF_F_HW_VLAN_CTAG_RX |
NETIF_F_HW_VLAN_CTAG_FILTER);
netdev->vlan_features = netdev->features;
netdev->vlan_features &= ~(NETIF_F_HW_VLAN_CTAG_TX |
NETIF_F_HW_VLAN_CTAG_RX |
NETIF_F_HW_VLAN_CTAG_FILTER);
netdev->fcoe_ddp_xid = I40E_FCOE_DDP_MAX - 1;
netdev->features |= NETIF_F_ALL_FCOE;
netdev->vlan_features |= NETIF_F_ALL_FCOE;
netdev->hw_features |= netdev->features;
netdev->priv_flags |= IFF_UNICAST_FLT;
netdev->priv_flags |= IFF_SUPP_NOFCS;
strlcpy(netdev->name, "fcoe%d", IFNAMSIZ-1);
netdev->mtu = FCOE_MTU;
SET_NETDEV_DEV(netdev, &pf->pdev->dev);
SET_NETDEV_DEVTYPE(netdev, &fcoe_netdev_type);
/* set different dev_port value 1 for FCoE netdev than the default
* zero dev_port value for PF netdev, this helps biosdevname user
* tool to differentiate them correctly while both attached to the
* same PCI function.
*/
netdev->dev_port = 1;
spin_lock_bh(&vsi->mac_filter_hash_lock);
i40e_add_filter(vsi, hw->mac.san_addr, 0);
i40e_add_filter(vsi, (u8[6]) FC_FCOE_FLOGI_MAC, 0);
i40e_add_filter(vsi, FIP_ALL_FCOE_MACS, 0);
i40e_add_filter(vsi, FIP_ALL_ENODE_MACS, 0);
spin_unlock_bh(&vsi->mac_filter_hash_lock);
/* use san mac */
ether_addr_copy(netdev->dev_addr, hw->mac.san_addr);
ether_addr_copy(netdev->perm_addr, hw->mac.san_addr);
/* fcoe netdev ops */
netdev->netdev_ops = &i40e_fcoe_netdev_ops;
}
/**
* i40e_fcoe_vsi_setup - allocate and set up FCoE VSI
* @pf: the PF that VSI is associated with
*
**/
void i40e_fcoe_vsi_setup(struct i40e_pf *pf)
{
struct i40e_vsi *vsi;
u16 seid;
int i;
if (!(pf->flags & I40E_FLAG_FCOE_ENABLED))
return;
for (i = 0; i < pf->num_alloc_vsi; i++) {
vsi = pf->vsi[i];
if (vsi && vsi->type == I40E_VSI_FCOE) {
dev_warn(&pf->pdev->dev,
"FCoE VSI already created\n");
return;
}
}
seid = pf->vsi[pf->lan_vsi]->seid;
vsi = i40e_vsi_setup(pf, I40E_VSI_FCOE, seid, 0);
if (vsi) {
dev_dbg(&pf->pdev->dev,
"Successfully created FCoE VSI seid %d id %d uplink_seid %d PF seid %d\n",
vsi->seid, vsi->id, vsi->uplink_seid, seid);
} else {
dev_info(&pf->pdev->dev, "Failed to create FCoE VSI\n");
}
}
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