smi.rar_The Handle_smi handle

#include <rdma/ib_smi.h> #include "smi.h" /* * Fixup a directed route SMP for sending * Return 0 if the SMP should be discarded */ enum smi_action smi_handle_dr_smp_send(struct ib_smp *smp, u8 node_type, int port_num) { u8 hop_ptr, hop_cnt; hop_ptr = smp->hop_ptr; hop_cnt = smp->hop_cnt; /* See section 14.2.2.2, Vol 1 IB spec */ /* C14-6 -- valid hop_cnt values are from 0 to 63 */ if (hop_cnt >= IB_SMP_MAX_PATH_HOPS) return IB_SMI_DISCARD; if (!ib_get_smp_direction(smp)) { /* C14-9:1 */ if (hop_cnt && hop_ptr == 0) { smp->hop_ptr++; return (smp->initial_path[smp->hop_ptr] == port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); } /* C14-9:2 */ if (hop_ptr && hop_ptr < hop_cnt) { if (node_type != RDMA_NODE_IB_SWITCH) return IB_SMI_DISCARD; /* smp->return_path set when received */ smp->hop_ptr++; return (smp->initial_path[smp->hop_ptr] == port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); } /* C14-9:3 -- We're at the end of the DR segment of path */ if (hop_ptr == hop_cnt) { /* smp->return_path set when received */ smp->hop_ptr++; return (node_type == RDMA_NODE_IB_SWITCH || smp->dr_dlid == IB_LID_PERMISSIVE ? IB_SMI_HANDLE : IB_SMI_DISCARD); } /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */ /* C14-9:5 -- Fail unreasonable hop pointer */ return (hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD); } else { /* C14-13:1 */ if (hop_cnt && hop_ptr == hop_cnt + 1) { smp->hop_ptr--; return (smp->return_path[smp->hop_ptr] == port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); } /* C14-13:2 */ if (2 <= hop_ptr && hop_ptr <= hop_cnt) { if (node_type != RDMA_NODE_IB_SWITCH) return IB_SMI_DISCARD; smp->hop_ptr--; return (smp->return_path[smp->hop_ptr] == port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); } /* C14-13:3 -- at the end of the DR segment of path */ if (hop_ptr == 1) { smp->hop_ptr--; /* C14-13:3 -- SMPs destined for SM shouldn't be here */ return (node_type == RDMA_NODE_IB_SWITCH || smp->dr_slid == IB_LID_PERMISSIVE ? IB_SMI_HANDLE : IB_SMI_DISCARD); } /* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */ if (hop_ptr == 0) return IB_SMI_HANDLE; /* C14-13:5 -- Check for unreasonable hop pointer */ return IB_SMI_DISCARD; } } /* * Adjust information for a received SMP * Return 0 if the SMP should be dropped */ enum smi_action smi_handle_dr_smp_recv(struct ib_smp *smp, u8 node_type, int port_num, int phys_port_cnt) { u8 hop_ptr, hop_cnt; hop_ptr = smp->hop_ptr; hop_cnt = smp->hop_cnt; /* See section 14.2.2.2, Vol 1 IB spec */ /* C14-6 -- valid hop_cnt values are from 0 to 63 */ if (hop_cnt >= IB_SMP_MAX_PATH_HOPS) return IB_SMI_DISCARD; if (!ib_get_smp_direction(smp)) { /* C14-9:1 -- sender should have incremented hop_ptr */ if (hop_cnt && hop_ptr == 0) return IB_SMI_DISCARD; /* C14-9:2 -- intermediate hop */ if (hop_ptr && hop_ptr < hop_cnt) { if (node_type != RDMA_NODE_IB_SWITCH) return IB_SMI_DISCARD; smp->return_path[hop_ptr] = port_num; /* smp->hop_ptr updated when sending */ return (smp->initial_path[hop_ptr+1] <= phys_port_cnt ? IB_SMI_HANDLE : IB_SMI_DISCARD); } /* C14-9:3 -- We're at the end of the DR segment of path */ if (hop_ptr == hop_cnt) { if (hop_cnt) smp->return_path[hop_ptr] = port_num; /* smp->hop_ptr updated when sending */ return (node_type == RDMA_NODE_IB_SWITCH || smp->dr_dlid == IB_LID_PERMISSIVE ? IB_SMI_HANDLE : IB_SMI_DISCARD); } /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */ /* C14-9:5 -- fail unreasonable hop pointer */ return (hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD); } else { /* C14-13:1 */ if (hop_cnt && hop_ptr == hop_cnt + 1) { smp->hop_ptr--; return (smp->return_path[smp->hop_ptr] == port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); } /* C14-13:2 */ if (2 <= hop_ptr && hop_ptr <= hop_cnt) { if (node_type != RDMA_NODE_IB_SWITCH) return IB_SMI_DISCARD; /* smp->hop_ptr updated when sending */ return (smp->return_path[hop_ptr-1] <= phys_port_cnt ? IB_SMI_HANDLE : IB_SMI_DISCARD); } /* C14-13:3 -- We're at the end of the DR segment of path */ if (hop_ptr == 1) { if (smp->dr_slid == IB_LID_PERMISSIVE) { /* giving SMP to SM - update hop_ptr */ smp->hop_ptr--; return IB_SMI_HANDLE; } /* smp->hop_ptr updated when sending */ return (node_type == RDMA_NODE_IB_SWITCH ? IB_SMI_HANDLE : IB_SMI_DISCARD); } /* C14-13:4 -- hop_ptr = 0 -> give to SM */ /* C14-13:5 -- Check for unreasonable hop pointer */ return (hop_ptr == 0 ? IB_SMI_HANDLE : IB_SMI_DISCARD); } } enum smi_forward_action smi_check_forward_dr_smp(struct ib_smp *smp) { u8 hop_ptr, hop_cnt; hop_ptr = smp->hop_ptr; hop_cnt = smp->hop_cnt; if (!ib_get_smp_direction(smp)) { /* C14-9:2 -- intermediate hop */ if (hop_ptr && hop_ptr < hop_cnt) return IB_SMI_FORWARD; /* C14-9:3 -- at the end of the DR segment of path */ if (hop_ptr == hop_cnt) return (smp->dr_dlid == IB_LID_PERMISSIVE ? IB_SMI_SEND : IB_SMI_LOCAL); /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */ if (hop_ptr == hop_cnt + 1) return IB_SMI_SEND; } else { /* C14-13:2 -- intermediate hop */ if (2 <= hop_ptr && hop_ptr <= hop_cnt) return IB_SMI_FORWARD; /* C14-13:3 -- at the end of the DR segment of path */ if (hop_ptr == 1) return (smp->dr_slid != IB_LID_PERMISSIVE ? IB_SMI_SEND : IB_SMI_LOCAL); } return IB_SMI_LOCAL; } /* * Return the forwarding port number from initial_path for outgoing SMP and * from return_path for returning SMP */ int smi_get_fwd_port(struct ib_smp *smp) { return (!ib_get_smp_direction(smp) ? smp->initial_path[smp->hop_ptr+1] : smp->return_path[smp->hop_ptr-1]); }