/* Performance tuning parameters for fcoe */ staticunsignedint fcoe_ddp_min = 4096;
module_param_named(ddp_min, fcoe_ddp_min, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for " \ "Direct Data Placement (DDP).");
unsignedint fcoe_debug_logging;
module_param_named(debug_logging, fcoe_debug_logging, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
/* fcoe host list */ /* must only by accessed under the RTNL mutex */ static LIST_HEAD(fcoe_hostlist); static DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);
/** * fcoe_interface_setup() - Setup a FCoE interface * @fcoe: The new FCoE interface * @netdev: The net device that the fcoe interface is on * * Returns : 0 for success * Locking: must be called with the RTNL mutex held
*/ staticint fcoe_interface_setup(struct fcoe_interface *fcoe, struct net_device *netdev)
{ struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe); struct netdev_hw_addr *ha; struct net_device *real_dev; staticconst u8 flogi_maddr[ETH_ALEN] = FC_FCOE_FLOGI_MAC; conststruct net_device_ops *ops;
fcoe->netdev = netdev;
/* Let LLD initialize for FCoE */
ops = netdev->netdev_ops; if (ops->ndo_fcoe_enable) { if (ops->ndo_fcoe_enable(netdev))
FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE" " specific feature for LLD.\n");
}
/* Do not support for bonding device */ if (netif_is_bond_master(netdev)) {
FCOE_NETDEV_DBG(netdev, "Bonded interfaces not supported\n"); return -EOPNOTSUPP;
}
/* look for SAN MAC address, if multiple SAN MACs exist, only
* use the first one for SPMA */
real_dev = is_vlan_dev(netdev) ? vlan_dev_real_dev(netdev) : netdev;
fcoe->realdev = real_dev;
rcu_read_lock();
for_each_dev_addr(real_dev, ha) { if ((ha->type == NETDEV_HW_ADDR_T_SAN) &&
(is_valid_ether_addr(ha->addr))) {
memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN);
fip->spma = 1; break;
}
}
rcu_read_unlock();
/* setup Source Mac Address */ if (!fip->spma)
memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len);
/* * Add FCoE MAC address as second unicast MAC address * or enter promiscuous mode if not capable of listening * for multiple unicast MACs.
*/
dev_uc_add(netdev, flogi_maddr); if (fip->spma)
dev_uc_add(netdev, fip->ctl_src_addr); if (fip->mode == FIP_MODE_VN2VN) {
dev_mc_add(netdev, FIP_ALL_VN2VN_MACS);
dev_mc_add(netdev, FIP_ALL_P2P_MACS);
} else
dev_mc_add(netdev, FIP_ALL_ENODE_MACS);
/* * setup the receive function from ethernet driver * on the ethertype for the given device
*/
fcoe->fcoe_packet_type.func = fcoe_rcv;
fcoe->fcoe_packet_type.type = htons(ETH_P_FCOE);
fcoe->fcoe_packet_type.dev = netdev;
dev_add_pack(&fcoe->fcoe_packet_type);
/** * fcoe_interface_create() - Create a FCoE interface on a net device * @netdev: The net device to create the FCoE interface on * @fip_mode: The mode to use for FIP * * Returns: pointer to a struct fcoe_interface or NULL on error
*/ staticstruct fcoe_interface *fcoe_interface_create(struct net_device *netdev, enum fip_mode fip_mode)
{ struct fcoe_ctlr_device *ctlr_dev; struct fcoe_ctlr *ctlr; struct fcoe_interface *fcoe; int size; int err;
if (!try_module_get(THIS_MODULE)) {
FCOE_NETDEV_DBG(netdev, "Could not get a reference to the module\n");
fcoe = ERR_PTR(-EBUSY); goto out;
}
/** * fcoe_interface_remove() - remove FCoE interface from netdev * @fcoe: The FCoE interface to be cleaned up * * Caller must be holding the RTNL mutex
*/ staticvoid fcoe_interface_remove(struct fcoe_interface *fcoe)
{ struct net_device *netdev = fcoe->netdev; struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe); staticconst u8 flogi_maddr[ETH_ALEN] = FC_FCOE_FLOGI_MAC; conststruct net_device_ops *ops;
/* * Don't listen for Ethernet packets anymore. * synchronize_net() ensures that the packet handlers are not running * on another CPU. dev_remove_pack() would do that, this calls the * unsyncronized version __dev_remove_pack() to avoid multiple delays.
*/
__dev_remove_pack(&fcoe->fcoe_packet_type);
__dev_remove_pack(&fcoe->fip_packet_type); if (netdev != fcoe->realdev)
__dev_remove_pack(&fcoe->fip_vlan_packet_type);
synchronize_net();
/* Delete secondary MAC addresses */
dev_uc_del(netdev, flogi_maddr); if (fip->spma)
dev_uc_del(netdev, fip->ctl_src_addr); if (fip->mode == FIP_MODE_VN2VN) {
dev_mc_del(netdev, FIP_ALL_VN2VN_MACS);
dev_mc_del(netdev, FIP_ALL_P2P_MACS);
} else
dev_mc_del(netdev, FIP_ALL_ENODE_MACS);
/* Tell the LLD we are done w/ FCoE */
ops = netdev->netdev_ops; if (ops->ndo_fcoe_disable) { if (ops->ndo_fcoe_disable(netdev))
FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE" " specific feature for LLD.\n");
}
fcoe->removed = 1;
}
/** * fcoe_interface_cleanup() - Clean up a FCoE interface * @fcoe: The FCoE interface to be cleaned up
*/ staticvoid fcoe_interface_cleanup(struct fcoe_interface *fcoe)
{ struct net_device *netdev = fcoe->netdev; struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
/* Release the self-reference taken during fcoe_interface_create() */ /* tear-down the FCoE controller */
fcoe_ctlr_destroy(fip);
scsi_host_put(fip->lp->host);
dev_put(netdev);
module_put(THIS_MODULE);
}
/** * fcoe_fip_recv() - Handler for received FIP frames * @skb: The receive skb * @netdev: The associated net device * @ptype: The packet_type structure which was used to register this handler * @orig_dev: The original net_device the skb was received on. * (in case dev is a bond) * * Returns: 0 for success
*/ staticint fcoe_fip_recv(struct sk_buff *skb, struct net_device *netdev, struct packet_type *ptype, struct net_device *orig_dev)
{ struct fcoe_interface *fcoe; struct fcoe_ctlr *ctlr;
/** * fcoe_fip_vlan_recv() - Handler for received FIP VLAN discovery frames * @skb: The receive skb * @netdev: The associated net device * @ptype: The packet_type structure which was used to register this handler * @orig_dev: The original net_device the skb was received on. * (in case dev is a bond) * * Returns: 0 for success
*/ staticint fcoe_fip_vlan_recv(struct sk_buff *skb, struct net_device *netdev, struct packet_type *ptype, struct net_device *orig_dev)
{ struct fcoe_interface *fcoe; struct fcoe_ctlr *ctlr;
/** * fcoe_port_send() - Send an Ethernet-encapsulated FIP/FCoE frame * @port: The FCoE port * @skb: The FIP/FCoE packet to be sent
*/ staticvoid fcoe_port_send(struct fcoe_port *port, struct sk_buff *skb)
{ if (port->fcoe_pending_queue.qlen)
fcoe_check_wait_queue(port->lport, skb); elseif (fcoe_start_io(skb))
fcoe_check_wait_queue(port->lport, skb);
}
/** * fcoe_fip_send() - Send an Ethernet-encapsulated FIP frame * @fip: The FCoE controller * @skb: The FIP packet to be sent
*/ staticvoid fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
{ struct fcoe_interface *fcoe = fcoe_from_ctlr(fip); struct fip_frame { struct ethhdr eth; struct fip_header fip;
} __packed *frame;
/** * fcoe_update_src_mac() - Update the Ethernet MAC filters * @lport: The local port to update the source MAC on * @addr: Unicast MAC address to add * * Remove any previously-set unicast MAC filter. * Add secondary FCoE MAC address filter for our OUI.
*/ staticvoid fcoe_update_src_mac(struct fc_lport *lport, u8 *addr)
{ struct fcoe_port *port = lport_priv(lport); struct fcoe_interface *fcoe = port->priv;
if (!is_zero_ether_addr(port->data_src_addr))
dev_uc_del(fcoe->netdev, port->data_src_addr); if (!is_zero_ether_addr(addr))
dev_uc_add(fcoe->netdev, addr);
memcpy(port->data_src_addr, addr, ETH_ALEN);
}
/** * fcoe_get_src_mac() - return the Ethernet source address for an lport * @lport: libfc lport
*/ static u8 *fcoe_get_src_mac(struct fc_lport *lport)
{ struct fcoe_port *port = lport_priv(lport);
return port->data_src_addr;
}
/** * fcoe_lport_config() - Set up a local port * @lport: The local port to be setup * * Returns: 0 for success
*/ staticint fcoe_lport_config(struct fc_lport *lport)
{
lport->link_up = 0;
lport->qfull = 0;
lport->max_retry_count = 3;
lport->max_rport_retry_count = 3;
lport->e_d_tov = fcoe_e_d_tov;
lport->r_a_tov = fcoe_r_a_tov;
lport->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
lport->does_npiv = 1;
fc_lport_init_stats(lport);
/* lport fc_lport related configuration */
fc_lport_config(lport);
if (netdev->features & NETIF_F_FSO) {
lport->seq_offload = 1;
lport->lso_max = min(netdev->gso_max_size, GSO_LEGACY_MAX_SIZE);
FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n",
lport->lso_max);
} else {
lport->seq_offload = 0;
lport->lso_max = 0;
}
if (netdev->fcoe_ddp_xid) {
lport->lro_enabled = 1;
lport->lro_xid = netdev->fcoe_ddp_xid;
FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n",
lport->lro_xid);
} else {
lport->lro_enabled = 0;
lport->lro_xid = 0;
}
mutex_unlock(&lport->lp_mutex);
}
/** * fcoe_netdev_config() - Set up net devive for SW FCoE * @lport: The local port that is associated with the net device * @netdev: The associated net device * * Must be called after fcoe_lport_config() as it will use local port mutex * * Returns: 0 for success
*/ staticint fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev)
{
u32 mfs;
u64 wwnn, wwpn; struct fcoe_interface *fcoe; struct fcoe_ctlr *ctlr; struct fcoe_port *port;
/* Setup lport private data to point to fcoe softc */
port = lport_priv(lport);
fcoe = port->priv;
ctlr = fcoe_to_ctlr(fcoe);
/* Figure out the VLAN ID, if any */ if (is_vlan_dev(netdev))
lport->vlan = vlan_dev_vlan_id(netdev); else
lport->vlan = 0;
/* * Determine max frame size based on underlying device and optional * user-configured limit. If the MFS is too low, fcoe_link_ok() * will return 0, so do this first.
*/
mfs = netdev->mtu; if (netdev->fcoe_mtu) {
mfs = FCOE_MTU;
FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs);
}
mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof)); if (fc_set_mfs(lport, mfs)) return -EINVAL;
/* offload features support */
fcoe_netdev_features_change(lport, netdev);
if (!lport->vport) { if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN))
wwnn = fcoe_wwn_from_mac(ctlr->ctl_src_addr, 1, 0);
fc_set_wwnn(lport, wwnn); if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN))
wwpn = fcoe_wwn_from_mac(ctlr->ctl_src_addr,
2, 0);
fc_set_wwpn(lport, wwpn);
}
return 0;
}
/** * fcoe_shost_config() - Set up the SCSI host associated with a local port * @lport: The local port * @dev: The device associated with the SCSI host * * Must be called after fcoe_lport_config() and fcoe_netdev_config() * * Returns: 0 for success
*/ staticint fcoe_shost_config(struct fc_lport *lport, struct device *dev)
{ int rc = 0;
if (lport->vport)
lport->host->transportt = fcoe_vport_scsi_transport; else
lport->host->transportt = fcoe_nport_scsi_transport;
/* add the new host to the SCSI-ml */
rc = scsi_add_host(lport->host, dev); if (rc) {
FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: " "error on scsi_add_host\n"); return rc;
}
if (!lport->vport)
fc_host_max_npiv_vports(lport->host) = USHRT_MAX;
snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE, "%s v%s over %s", FCOE_NAME, FCOE_VERSION,
fcoe_netdev(lport)->name);
return 0;
}
/** * fcoe_fdmi_info() - Get FDMI related info from net devive for SW FCoE * @lport: The local port that is associated with the net device * @netdev: The associated net device * * Must be called after fcoe_shost_config() as it will use local port mutex *
*/ staticvoid fcoe_fdmi_info(struct fc_lport *lport, struct net_device *netdev)
{ struct fcoe_interface *fcoe; struct fcoe_port *port; struct net_device *realdev; int rc;
port = lport_priv(lport);
fcoe = port->priv;
realdev = fcoe->realdev;
/* No FDMI state m/c for NPIV ports */ if (lport->vport) return;
if (realdev->netdev_ops->ndo_fcoe_get_hbainfo) { struct netdev_fcoe_hbainfo *fdmi;
fdmi = kzalloc(sizeof(*fdmi), GFP_KERNEL); if (!fdmi) return;
rc = realdev->netdev_ops->ndo_fcoe_get_hbainfo(realdev,
fdmi); if (rc) {
printk(KERN_INFO "fcoe: Failed to retrieve FDMI " "information from netdev.\n"); return;
}
/** * fcoe_oem_match() - The match routine for the offloaded exchange manager * @fp: The I/O frame * * This routine will be associated with an exchange manager (EM). When * the libfc exchange handling code is looking for an EM to use it will * call this routine and pass it the frame that it wishes to send. This * routine will return True if the associated EM is to be used and False * if the echange code should continue looking for an EM. * * The offload EM that this routine is associated with will handle any * packets that are for SCSI read requests. * * This has been enhanced to work when FCoE stack is operating in target * mode. * * Returns: True for read types I/O, otherwise returns false.
*/ staticbool fcoe_oem_match(struct fc_frame *fp)
{ struct fc_frame_header *fh = fc_frame_header_get(fp); struct fcp_cmnd *fcp;
/** * fcoe_em_config() - Allocate and configure an exchange manager * @lport: The local port that the new EM will be associated with * * Returns: 0 on success
*/ staticinlineint fcoe_em_config(struct fc_lport *lport)
{ struct fcoe_port *port = lport_priv(lport); struct fcoe_interface *fcoe = port->priv; struct fcoe_interface *oldfcoe = NULL; struct net_device *old_real_dev, *cur_real_dev;
u16 min_xid = FCOE_MIN_XID;
u16 max_xid = FCOE_MAX_XID;
/* * Check if need to allocate an em instance for * offload exchange ids to be shared across all VN_PORTs/lport.
*/ if (!lport->lro_enabled || !lport->lro_xid ||
(lport->lro_xid >= max_xid)) {
lport->lro_xid = 0; goto skip_oem;
}
/* * Reuse existing offload em instance in case * it is already allocated on real eth device
*/ if (is_vlan_dev(fcoe->netdev))
cur_real_dev = vlan_dev_real_dev(fcoe->netdev); else
cur_real_dev = fcoe->netdev;
if (fcoe->oem) { if (!fc_exch_mgr_add(lport, fcoe->oem, fcoe_oem_match)) {
printk(KERN_ERR "fcoe_em_config: failed to add " "offload em:%p on interface:%s\n",
fcoe->oem, fcoe->netdev->name); return -ENOMEM;
}
} else {
fcoe->oem = fc_exch_mgr_alloc(lport, FC_CLASS_3,
FCOE_MIN_XID, lport->lro_xid,
fcoe_oem_match); if (!fcoe->oem) {
printk(KERN_ERR "fcoe_em_config: failed to allocate " "em for offload exches on interface:%s\n",
fcoe->netdev->name); return -ENOMEM;
}
}
/* * Exclude offload EM xid range from next EM xid range.
*/
min_xid += lport->lro_xid + 1;
skip_oem: if (!fc_exch_mgr_alloc(lport, FC_CLASS_3, min_xid, max_xid, NULL)) {
printk(KERN_ERR "fcoe_em_config: failed to " "allocate em on interface %s\n", fcoe->netdev->name); return -ENOMEM;
}
return 0;
}
/** * fcoe_if_destroy() - Tear down a SW FCoE instance * @lport: The local port to be destroyed * * Locking: Must be called with the RTNL mutex held. *
*/ staticvoid fcoe_if_destroy(struct fc_lport *lport)
{ struct fcoe_port *port = lport_priv(lport); struct fcoe_interface *fcoe = port->priv; struct net_device *netdev = fcoe->netdev;
if (!is_zero_ether_addr(port->data_src_addr))
dev_uc_del(netdev, port->data_src_addr); if (lport->vport)
synchronize_net(); else
fcoe_interface_remove(fcoe);
/* Free queued packets for the per-CPU receive threads */
fcoe_percpu_clean(lport);
/* Detach from the scsi-ml */
fc_remove_host(lport->host);
scsi_remove_host(lport->host);
/* There are no more rports or I/O, free the EM */
fc_exch_mgr_free(lport);
/* Free memory used by statistical counters */
fc_lport_free_stats(lport);
/* * Release the Scsi_Host for vport but hold on to * master lport until it fcoe interface fully cleaned-up.
*/ if (lport->vport)
scsi_host_put(lport->host);
}
/** * fcoe_ddp_setup() - Call a LLD's ddp_setup through the net device * @lport: The local port to setup DDP for * @xid: The exchange ID for this DDP transfer * @sgl: The scatterlist describing this transfer * @sgc: The number of sg items * * Returns: 0 if the DDP context was not configured
*/ staticint fcoe_ddp_setup(struct fc_lport *lport, u16 xid, struct scatterlist *sgl, unsignedint sgc)
{ struct net_device *netdev = fcoe_netdev(lport);
if (netdev->netdev_ops->ndo_fcoe_ddp_setup) return netdev->netdev_ops->ndo_fcoe_ddp_setup(netdev,
xid, sgl,
sgc);
return 0;
}
/** * fcoe_ddp_target() - Call a LLD's ddp_target through the net device * @lport: The local port to setup DDP for * @xid: The exchange ID for this DDP transfer * @sgl: The scatterlist describing this transfer * @sgc: The number of sg items * * Returns: 0 if the DDP context was not configured
*/ staticint fcoe_ddp_target(struct fc_lport *lport, u16 xid, struct scatterlist *sgl, unsignedint sgc)
{ struct net_device *netdev = fcoe_netdev(lport);
if (netdev->netdev_ops->ndo_fcoe_ddp_target) return netdev->netdev_ops->ndo_fcoe_ddp_target(netdev, xid,
sgl, sgc);
return 0;
}
/** * fcoe_ddp_done() - Call a LLD's ddp_done through the net device * @lport: The local port to complete DDP on * @xid: The exchange ID for this DDP transfer * * Returns: the length of data that have been completed by DDP
*/ staticint fcoe_ddp_done(struct fc_lport *lport, u16 xid)
{ struct net_device *netdev = fcoe_netdev(lport);
if (netdev->netdev_ops->ndo_fcoe_ddp_done) return netdev->netdev_ops->ndo_fcoe_ddp_done(netdev, xid); return 0;
}
/** * fcoe_if_create() - Create a FCoE instance on an interface * @fcoe: The FCoE interface to create a local port on * @parent: The device pointer to be the parent in sysfs for the SCSI host * @npiv: Indicates if the port is a vport or not * * Creates a fc_lport instance and a Scsi_Host instance and configure them. * * Returns: The allocated fc_lport or an error pointer
*/ staticstruct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe, struct device *parent, int npiv)
{ struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); struct net_device *netdev = fcoe->netdev; struct fc_lport *lport, *n_port; struct fcoe_port *port; struct Scsi_Host *shost; int rc; /* * parent is only a vport if npiv is 1, * but we'll only use vport in that case so go ahead and set it
*/ struct fc_vport *vport = dev_to_vport(parent);
/* * Need to add the lport to the hostlist * so we catch NETDEV_CHANGE events.
*/
fcoe_hostlist_add(lport);
/* configure a fc_lport including the exchange manager */
rc = fcoe_lport_config(lport); if (rc) {
FCOE_NETDEV_DBG(netdev, "Could not configure lport for the " "interface\n"); goto out_host_put;
}
/* configure lport network properties */
rc = fcoe_netdev_config(lport, netdev); if (rc) {
FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the " "interface\n"); goto out_lp_destroy;
}
/* configure lport scsi host properties */
rc = fcoe_shost_config(lport, parent); if (rc) {
FCOE_NETDEV_DBG(netdev, "Could not configure shost for the " "interface\n"); goto out_lp_destroy;
}
/* Initialize the library */
rc = fcoe_libfc_config(lport, ctlr, &fcoe_libfc_fcn_templ, 1); if (rc) {
FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the " "interface\n"); goto out_lp_destroy;
}
/* Initialized FDMI information */
fcoe_fdmi_info(lport, netdev);
/* * fcoe_em_alloc() and fcoe_hostlist_add() both * need to be atomic with respect to other changes to the * hostlist since fcoe_em_alloc() looks for an existing EM * instance on host list updated by fcoe_hostlist_add(). * * This is currently handled through the fcoe_config_mutex * begin held.
*/ if (!npiv) /* lport exch manager allocation */
rc = fcoe_em_config(lport); else {
shost = vport_to_shost(vport);
n_port = shost_priv(shost);
rc = fc_exch_mgr_list_clone(n_port, lport);
}
if (rc) {
FCOE_NETDEV_DBG(netdev, "Could not configure the EM\n"); goto out_lp_destroy;
}
/** * fcoe_if_init() - Initialization routine for fcoe.ko * * Attaches the SW FCoE transport to the FC transport * * Returns: 0 on success
*/ staticint __init fcoe_if_init(void)
{ /* attach to scsi transport */
fcoe_nport_scsi_transport =
fc_attach_transport(&fcoe_nport_fc_functions); if (!fcoe_nport_scsi_transport) goto err;
fcoe_vport_scsi_transport =
fc_attach_transport(&fcoe_vport_fc_functions); if (!fcoe_vport_scsi_transport) goto err_vport;
return 0;
err_vport:
fc_release_transport(fcoe_nport_scsi_transport);
err:
printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n"); return -ENODEV;
}
/** * fcoe_if_exit() - Tear down fcoe.ko * * Detaches the SW FCoE transport from the FC transport * * Returns: 0 on success
*/ staticint __exit fcoe_if_exit(void)
{
fc_release_transport(fcoe_nport_scsi_transport);
fc_release_transport(fcoe_vport_scsi_transport);
fcoe_nport_scsi_transport = NULL;
fcoe_vport_scsi_transport = NULL; return 0;
}
if (crc_eof)
put_page(crc_eof);
flush_work(&p->work);
}
/** * fcoe_rcv() - Receive packets from a net device * @skb: The received packet * @netdev: The net device that the packet was received on * @ptype: The packet type context * @olddev: The last device net device * * This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a * FC frame and passes the frame to libfc. * * Returns: 0 for success
*/ staticint fcoe_rcv(struct sk_buff *skb, struct net_device *netdev, struct packet_type *ptype, struct net_device *olddev)
{ struct fc_lport *lport; struct fcoe_rcv_info *fr; struct fcoe_ctlr *ctlr; struct fcoe_interface *fcoe; struct fc_frame_header *fh; struct fcoe_percpu_s *fps; struct ethhdr *eh; unsignedint cpu;
if (is_fip_mode(ctlr) &&
!ether_addr_equal(eh->h_source, ctlr->dest_addr)) {
FCOE_NETDEV_DBG(netdev, "wrong source mac address:%pM\n",
eh->h_source); goto err;
}
/* * Check for minimum frame length, and make sure required FCoE * and FC headers are pulled into the linear data area.
*/ if (unlikely((skb->len < FCOE_MIN_FRAME) ||
!pskb_may_pull(skb, FCOE_HEADER_LEN))) goto err;
if (ntoh24(&eh->h_dest[3]) != ntoh24(fh->fh_d_id)) {
FCOE_NETDEV_DBG(netdev, "FC frame d_id mismatch with MAC:%pM\n",
eh->h_dest); goto err;
}
fr = fcoe_dev_from_skb(skb);
fr->fr_dev = lport;
/* * 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 select cpu using rx exchange id * or fcoe_select_cpu().
*/ if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX)
cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask; else { if (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)
cpu = skb->alloc_cpu; else
cpu = ntohs(fh->fh_rx_id) & fc_cpu_mask;
}
if (cpu >= nr_cpu_ids) goto err;
fps = &per_cpu(fcoe_percpu, cpu);
spin_lock(&fps->fcoe_rx_list.lock); /* * We now have a valid CPU that we're targeting for * this skb. We also have this receive thread locked, * so we're free to queue skbs into it's queue.
*/
/* * Note: We used to have a set of conditions under which we would * call fcoe_recv_frame directly, rather than queuing to the rx list * as it could save a few cycles, but doing so is prohibited, as * fcoe_recv_frame has several paths that may sleep, which is forbidden * in softirq context.
*/
__skb_queue_tail(&fps->fcoe_rx_list, skb);
schedule_work_on(cpu, &fps->work);
spin_unlock(&fps->fcoe_rx_list.lock);
/** * fcoe_alloc_paged_crc_eof() - Allocate a page to be used for the trailer CRC * @skb: The packet to be transmitted * @tlen: The total length of the trailer * * Returns: 0 for success
*/ staticint fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen)
{ struct fcoe_percpu_s *fps; int rc;
if (is_vlan_dev(fcoe->netdev) &&
fcoe->realdev->features & NETIF_F_HW_VLAN_CTAG_TX) { /* must set skb->dev before calling vlan_put_tag */
skb->dev = fcoe->realdev;
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
vlan_dev_vlan_id(fcoe->netdev));
} else
skb->dev = fcoe->netdev;
/* fill up mac and fcoe headers */
eh = eth_hdr(skb);
eh->h_proto = htons(ETH_P_FCOE);
memcpy(eh->h_dest, ctlr->dest_addr, ETH_ALEN); if (ctlr->map_dest)
memcpy(eh->h_dest + 3, fh->fh_d_id, 3);
hp = (struct fcoe_hdr *)(eh + 1);
memset(hp, 0, sizeof(*hp)); if (FC_FCOE_VER)
FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
hp->fcoe_sof = sof;
/* fcoe lso, mss is in max_payload which is non-zero for FCP data */ if (lport->seq_offload && fr_max_payload(fp)) {
skb_shinfo(skb)->gso_type = SKB_GSO_FCOE;
skb_shinfo(skb)->gso_size = fr_max_payload(fp);
} else {
skb_shinfo(skb)->gso_type = 0;
skb_shinfo(skb)->gso_size = 0;
} /* update tx stats: regardless if LLD fails */
this_cpu_inc(lport->stats->TxFrames);
this_cpu_add(lport->stats->TxWords, wlen);
/* send down to lld */
fr_dev(fp) = lport;
fcoe_port_send(port, skb); return 0;
}
/** * fcoe_filter_frames() - filter out bad fcoe frames, i.e. bad CRC * @lport: The local port the frame was received on * @fp: The received frame * * Return: 0 on passing filtering checks
*/ staticinlineint fcoe_filter_frames(struct fc_lport *lport, struct fc_frame *fp)
{ struct fcoe_ctlr *ctlr; struct fcoe_interface *fcoe; struct fc_frame_header *fh; struct sk_buff *skb = (struct sk_buff *)fp;
/* * We only check CRC if no offload is available and if it is * it's solicited data, in which case, the FCP layer would * check it during the copy.
*/ if (lport->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY)
fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; else
fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
skb_linearize(skb); /* check for skb_is_nonlinear is within skb_linearize */
/* * Frame length checks and setting up the header pointers * was done in fcoe_rcv already.
*/
hp = (struct fcoe_hdr *) skb_network_header(skb);
if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { struct fc_stats *stats;
stats = per_cpu_ptr(lport->stats, raw_smp_processor_id()); if (READ_ONCE(stats->ErrorFrames) < 5)
printk(KERN_WARNING "fcoe: FCoE version " "mismatch: The frame has " "version %x, but the " "initiator supports version " "%x\n", FC_FCOE_DECAPS_VER(hp),
FC_FCOE_VER); goto drop;
}
/* Copy out the CRC and EOF trailer for access */ if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) goto drop;
fr_eof(fp) = crc_eof.fcoe_eof;
fr_crc(fp) = crc_eof.fcoe_crc32; if (pskb_trim(skb, fr_len)) goto drop;
if (entry->app.protocol == ETH_P_FCOE)
fcoe->priority = prio;
return NOTIFY_OK;
}
/** * fcoe_device_notification() - Handler for net device events * @notifier: The context of the notification * @event: The type of event * @ptr: The net device that the event was on * * This function is called by the Ethernet driver in case of link change event. * * Returns: 0 for success
*/ staticint fcoe_device_notification(struct notifier_block *notifier,
ulong event, void *ptr)
{ struct fcoe_ctlr_device *cdev; struct fc_lport *lport = NULL; struct net_device *netdev = netdev_notifier_info_to_dev(ptr); struct fcoe_ctlr *ctlr; struct fcoe_interface *fcoe;
u32 link_possible = 1;
u32 mfs; int rc = NOTIFY_OK;
switch (event) { case NETDEV_DOWN: case NETDEV_GOING_DOWN:
link_possible = 0; break; case NETDEV_UP: case NETDEV_CHANGE: break; case NETDEV_CHANGEMTU: if (netdev->fcoe_mtu) break;
mfs = netdev->mtu - (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof)); if (mfs >= FC_MIN_MAX_FRAME)
fc_set_mfs(lport, mfs); break; case NETDEV_REGISTER: break; case NETDEV_UNREGISTER:
list_del(&fcoe->list);
fcoe_vport_remove(lport);
mutex_lock(&fcoe_config_mutex);
fcoe_if_destroy(lport); if (!fcoe->removed)
fcoe_interface_remove(fcoe);
fcoe_interface_cleanup(fcoe);
mutex_unlock(&fcoe_config_mutex);
fcoe_ctlr_device_delete(fcoe_ctlr_to_ctlr_dev(ctlr)); goto out; case NETDEV_FEAT_CHANGE:
fcoe_netdev_features_change(lport, netdev); break; default:
FCOE_NETDEV_DBG(netdev, "Unknown event %ld " "from netdev netlink\n", event);
}
fcoe_link_speed_update(lport);
cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
if (link_possible && !fcoe_link_ok(lport)) { switch (cdev->enabled) { case FCOE_CTLR_DISABLED:
pr_info("Link up while interface is disabled.\n"); break; case FCOE_CTLR_ENABLED: case FCOE_CTLR_UNUSED:
fcoe_ctlr_link_up(ctlr);
}
} elseif (fcoe_ctlr_link_down(ctlr)) { switch (cdev->enabled) { case FCOE_CTLR_DISABLED:
pr_info("Link down while interface is disabled.\n"); break; case FCOE_CTLR_ENABLED: case FCOE_CTLR_UNUSED:
this_cpu_inc(lport->stats->LinkFailureCount);
fcoe_clean_pending_queue(lport);
}
}
out: return rc;
}
/** * fcoe_disable() - Disables a FCoE interface * @netdev : The net_device object the Ethernet interface to create on * * Called from fcoe transport. * * Returns: 0 for success * * Deprecated: use fcoe_ctlr_enabled()
*/ staticint fcoe_disable(struct net_device *netdev)
{ struct fcoe_ctlr *ctlr; struct fcoe_interface *fcoe; int rc = 0;
/** * fcoe_ctlr_enabled() - Enable or disable an FCoE Controller * @cdev: The FCoE Controller that is being enabled or disabled * * fcoe_sysfs will ensure that the state of 'enabled' has * changed, so no checking is necessary here. This routine simply * calls fcoe_enable or fcoe_disable, both of which are deprecated. * When those routines are removed the functionality can be merged * here.
*/ staticint fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev)
{ struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(cdev); struct fc_lport *lport = ctlr->lp; struct net_device *netdev = fcoe_netdev(lport);
switch (cdev->enabled) { case FCOE_CTLR_ENABLED: return fcoe_enable(netdev); case FCOE_CTLR_DISABLED: return fcoe_disable(netdev); case FCOE_CTLR_UNUSED: default: return -ENOTSUPP;
}
}
/** * fcoe_ctlr_mode() - Switch FIP mode * @ctlr_dev: The FCoE Controller that is being modified * * When the FIP mode has been changed we need to update * the multicast addresses to ensure we get the correct * frames.
*/ staticvoid fcoe_ctlr_mode(struct fcoe_ctlr_device *ctlr_dev)
{ struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev); struct fcoe_interface *fcoe = fcoe_ctlr_priv(ctlr);
/** * fcoe_destroy_work() - Destroy a FCoE port in a deferred work context * @work: Handle to the FCoE port to be destroyed
*/ staticvoid fcoe_destroy_work(struct work_struct *work)
{ struct fcoe_ctlr_device *cdev; struct fcoe_ctlr *ctlr; struct fcoe_port *port; struct fcoe_interface *fcoe;
port = container_of(work, struct fcoe_port, destroy_work);
rtnl_lock();
fcoe_if_destroy(port->lport); if (!fcoe->removed)
fcoe_interface_remove(fcoe);
rtnl_unlock();
fcoe_interface_cleanup(fcoe);
mutex_unlock(&fcoe_config_mutex);
fcoe_ctlr_device_delete(cdev);
}
/** * fcoe_match() - Check if the FCoE is supported on the given netdevice * @netdev : The net_device object the Ethernet interface to create on * * Called from fcoe transport. * * Returns: always returns true as this is the default FCoE transport, * i.e., support all netdevs.
*/ staticbool fcoe_match(struct net_device *netdev)
{ returntrue;
}
/** * fcoe_dcb_create() - Initialize DCB attributes and hooks * @fcoe: The new FCoE interface
*/ staticvoid fcoe_dcb_create(struct fcoe_interface *fcoe)
{ int ctlr_prio = TC_PRIO_BESTEFFORT; int fcoe_prio = TC_PRIO_INTERACTIVE; struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); #ifdef CONFIG_DCB int dcbx;
u8 fup, up; struct net_device *netdev = fcoe->realdev; struct dcb_app app = {
.priority = 0,
.protocol = ETH_P_FCOE
};
/** * _fcoe_create() - (internal) Create a fcoe interface * @netdev : The net_device object the Ethernet interface to create on * @fip_mode: The FIP mode for this creation * @link_state: The ctlr link state on creation * * Called from either the libfcoe 'create' module parameter * via fcoe_create or from fcoe_syfs's ctlr_create file. * * libfcoe's 'create' module parameter is deprecated so some * consolidation of code can be done when that interface is * removed.
*/ staticint _fcoe_create(struct net_device *netdev, enum fip_mode fip_mode, enum fcoe_create_link_state link_state)
{ int rc = 0; struct fcoe_ctlr_device *ctlr_dev; struct fcoe_ctlr *ctlr; struct fcoe_interface *fcoe; struct fc_lport *lport;
mutex_lock(&fcoe_config_mutex);
rtnl_lock();
/* look for existing lport */ if (fcoe_hostlist_lookup(netdev)) {
rc = -EEXIST; goto out_nodev;
}
/* * If the fcoe_ctlr_device is to be set to DISABLED * it must be done after the lport is added to the * hostlist, but before the rtnl_lock is released. * This is because the rtnl_lock protects the * hostlist that fcoe_device_notification uses. If * the FCoE Controller is intended to be created * DISABLED then 'enabled' needs to be considered * handling link events. 'enabled' must be set * before the lport can be found in the hostlist * when a link up event is received.
*/ if (link_state == FCOE_CREATE_LINK_UP)
ctlr_dev->enabled = FCOE_CTLR_ENABLED; else
ctlr_dev->enabled = FCOE_CTLR_DISABLED;
/** * fcoe_create() - Create a fcoe interface * @netdev : The net_device object the Ethernet interface to create on * @fip_mode: The FIP mode for this creation * * Called from fcoe transport * * Returns: 0 for success
*/ staticint fcoe_create(struct net_device *netdev, enum fip_mode fip_mode)
{ return _fcoe_create(netdev, fip_mode, FCOE_CREATE_LINK_UP);
}
/** * fcoe_ctlr_alloc() - Allocate a fcoe interface from fcoe_sysfs * @netdev: The net_device to be used by the allocated FCoE Controller * * This routine is called from fcoe_sysfs. It will start the fcoe_ctlr * in a link_down state. The allows the user an opportunity to configure * the FCoE Controller from sysfs before enabling the FCoE Controller. * * Creating in with this routine starts the FCoE Controller in Fabric * mode. The user can change to VN2VN or another mode before enabling.
*/ staticint fcoe_ctlr_alloc(struct net_device *netdev)
{ return _fcoe_create(netdev, FIP_MODE_FABRIC,
FCOE_CREATE_LINK_DOWN);
}
/** * fcoe_link_ok() - Check if the link is OK for a local port * @lport: The local port to check link on * * Returns: 0 if link is UP and OK, -1 if not *
*/ staticint fcoe_link_ok(struct fc_lport *lport)
{ struct net_device *netdev = fcoe_netdev(lport);
if (netif_oper_up(netdev)) return 0; return -1;
}
/** * fcoe_percpu_clean() - Clear all pending skbs for an local port * @lport: The local port whose skbs are to be cleared * * Must be called with fcoe_create_mutex held to single-thread completion. * * This flushes the pending skbs by flush the work item for each CPU. The work * item on each possible CPU is flushed because we may have used the per-CPU * struct of an offline CPU.
*/ staticvoid fcoe_percpu_clean(struct fc_lport *lport)
{ struct fcoe_percpu_s *pp; unsignedint cpu;
/** * fcoe_reset() - Reset a local port * @shost: The SCSI host associated with the local port to be reset * * Returns: Always 0 (return value required by FC transport template)
*/ staticint fcoe_reset(struct Scsi_Host *shost)
{ struct fc_lport *lport = shost_priv(shost); struct fcoe_port *port = lport_priv(lport); struct fcoe_interface *fcoe = port->priv; struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); struct fcoe_ctlr_device *cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
if (cdev->enabled != FCOE_CTLR_DISABLED &&
!fcoe_link_ok(ctlr->lp))
fcoe_ctlr_link_up(ctlr); return 0;
}
/** * fcoe_hostlist_lookup_port() - Find the FCoE interface associated with a net device * @netdev: The net device used as a key * * Locking: Must be called with the RNL mutex held. * * Returns: NULL or the FCoE interface
*/ staticstruct fcoe_interface *
fcoe_hostlist_lookup_port(conststruct net_device *netdev)
{ struct fcoe_interface *fcoe;
/** * fcoe_hostlist_lookup() - Find the local port associated with a * given net device * @netdev: The netdevice used as a key * * Locking: Must be called with the RTNL mutex held * * Returns: NULL or the local port
*/ staticstruct fc_lport *fcoe_hostlist_lookup(conststruct net_device *netdev)
{ struct fcoe_ctlr *ctlr; struct fcoe_interface *fcoe;
/** * fcoe_hostlist_add() - Add the FCoE interface identified by a local * port to the hostlist * @lport: The local port that identifies the FCoE interface to be added * * Locking: must be called with the RTNL mutex held * * Returns: 0 for success
*/ staticint fcoe_hostlist_add(conststruct fc_lport *lport)
{ struct fcoe_interface *fcoe; struct fcoe_port *port;
fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport)); if (!fcoe) {
port = lport_priv(lport);
fcoe = port->priv;
list_add_tail(&fcoe->list, &fcoe_hostlist);
} return 0;
}
/** * fcoe_hostlist_del() - Remove the FCoE interface identified by a local * port to the hostlist * @lport: The local port that identifies the FCoE interface to be added * * Locking: must be called with the RTNL mutex held *
*/ staticvoid fcoe_hostlist_del(conststruct fc_lport *lport)
{ struct fcoe_interface *fcoe; struct fcoe_port *port;
port = lport_priv(lport);
fcoe = port->priv;
list_del(&fcoe->list); return;
}
/** * fcoe_init() - Initialize fcoe.ko * * Returns: 0 on success, or a negative value on failure
*/ staticint __init fcoe_init(void)
{ struct fcoe_percpu_s *p; unsignedint cpu; int rc = 0;
fcoe_wq = alloc_workqueue("fcoe", 0, 0); if (!fcoe_wq) return -ENOMEM;
/* register as a fcoe transport */
rc = fcoe_transport_attach(&fcoe_sw_transport); if (rc) {
printk(KERN_ERR "failed to register an fcoe transport, check " "if libfcoe is loaded\n"); goto out_destroy;
}
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