/** * e1000_read_mbx_vf - Reads a message from the inbox intended for vf * @hw: pointer to the HW structure * @msg: The message buffer * @size: Length of buffer * @mbx_id: id of mailbox to read * * returns SUCCESS if it successfuly read message from buffer **/ static s32 e1000_read_mbx_vf(struct e1000_hw *hw, u32 *msg, u16 size, u16 E1000_UNUSEDARG mbx_id) { s32 ret_val = E1000_SUCCESS; u16 i; DEBUGFUNC("e1000_read_mbx_vf"); /* lock the mailbox to prevent pf/vf race condition */ ret_val = e1000_obtain_mbx_lock_vf(hw); if (ret_val) goto out_no_read; /* copy the message from the mailbox memory buffer */ for (i = 0; i < size; i++) msg[i] = E1000_READ_REG_ARRAY(hw, E1000_VMBMEM(0), i); /* Acknowledge receipt and release mailbox, then we're done */ E1000_WRITE_REG(hw, E1000_V2PMAILBOX(0), E1000_V2PMAILBOX_ACK); /* update stats */ hw->mbx.stats.msgs_rx++; out_no_read: return ret_val; }
/** * e1000_write_mbx_vf - Write a message to the mailbox * @hw: pointer to the HW structure * @msg: The message buffer * @size: Length of buffer * @mbx_id: id of mailbox to write * * returns SUCCESS if it successfully copied message into the buffer **/ static s32 e1000_write_mbx_vf(struct e1000_hw *hw, u32 *msg, u16 size, u16 E1000_UNUSEDARG mbx_id) { s32 ret_val; u16 i; DEBUGFUNC("e1000_write_mbx_vf"); /* lock the mailbox to prevent pf/vf race condition */ ret_val = e1000_obtain_mbx_lock_vf(hw); if (ret_val) goto out_no_write; /* flush msg and acks as we are overwriting the message buffer */ e1000_check_for_msg_vf(hw, 0); e1000_check_for_ack_vf(hw, 0); /* copy the caller specified message to the mailbox memory buffer */ for (i = 0; i < size; i++) E1000_WRITE_REG_ARRAY(hw, E1000_VMBMEM(0), i, msg[i]); /* update stats */ hw->mbx.stats.msgs_tx++; /* Drop VFU and interrupt the PF to tell it a message has been sent */ E1000_WRITE_REG(hw, E1000_V2PMAILBOX(0), E1000_V2PMAILBOX_REQ); out_no_write: return ret_val; }
/** * e1000_read_v2p_mailbox - read v2p mailbox * @hw: pointer to the HW structure * * This function is used to read the v2p mailbox without losing the read to * clear status bits. **/ static u32 e1000_read_v2p_mailbox(struct e1000_hw *hw) { u32 v2p_mailbox = E1000_READ_REG(hw, E1000_V2PMAILBOX(0)); v2p_mailbox |= hw->dev_spec.vf.v2p_mailbox; hw->dev_spec.vf.v2p_mailbox |= v2p_mailbox & E1000_V2PMAILBOX_R2C_BITS; return v2p_mailbox; }
/** * e1000_obtain_mbx_lock_vf - obtain mailbox lock * @hw: pointer to the HW structure * * return SUCCESS if we obtained the mailbox lock **/ static s32 e1000_obtain_mbx_lock_vf(struct e1000_hw *hw) { s32 ret_val = -E1000_ERR_MBX; DEBUGFUNC("e1000_obtain_mbx_lock_vf"); /* Take ownership of the buffer */ E1000_WRITE_REG(hw, E1000_V2PMAILBOX(0), E1000_V2PMAILBOX_VFU); /* reserve mailbox for vf use */ if (e1000_read_v2p_mailbox(hw) & E1000_V2PMAILBOX_VFU) ret_val = E1000_SUCCESS; return ret_val; }
/** * e1000_obtain_mbx_lock_vf - obtain mailbox lock * @hw: pointer to the HW structure * * return SUCCESS if we obtained the mailbox lock **/ static s32 e1000_obtain_mbx_lock_vf(struct e1000_hw *hw) { s32 ret_val = -E1000_ERR_MBX; int count = 10; DEBUGFUNC("e1000_obtain_mbx_lock_vf"); do { /* Take ownership of the buffer */ E1000_WRITE_REG(hw, E1000_V2PMAILBOX(0), E1000_V2PMAILBOX_VFU); /* reserve mailbox for vf use */ if (e1000_read_v2p_mailbox(hw) & E1000_V2PMAILBOX_VFU) { ret_val = E1000_SUCCESS; break; } usec_delay(1000); } while (count-- > 0); return ret_val; }