/** * e1000_write_mbx_vf - Write a message to the mailbox * @hw: pointer to the HW structure * @msg: The message buffer * @size: Length of buffer * * returns SUCCESS if it successfully copied message into the buffer **/ static s32 e1000_write_mbx_vf(struct e1000_hw *hw, u32 *msg, u16 size) { s32 err; u16 i; /* lock the mailbox to prevent pf/vf race condition */ err = e1000_obtain_mbx_lock_vf(hw); if (err) goto out_no_write; /* flush any ack or msg as we are going to overwrite mailbox */ e1000_check_for_ack_vf(hw); e1000_check_for_msg_vf(hw); /* copy the caller specified message to the mailbox memory buffer */ for (i = 0; i < size; i++) array_ew32(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 */ ew32(V2PMAILBOX(0), E1000_V2PMAILBOX_REQ); out_no_write: return err; }
/** * 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 * * returns SUCCESS if it successfully read message from buffer **/ static s32 e1000_read_mbx_vf(struct e1000_hw *hw, u32 *msg, u16 size) { s32 err; u16 i; WARN_ON_ONCE(!spin_is_locked(&hw->mbx_lock)); /* lock the mailbox to prevent pf/vf race condition */ err = e1000_obtain_mbx_lock_vf(hw); if (err) goto out_no_read; /* copy the message from the mailbox memory buffer */ for (i = 0; i < size; i++) msg[i] = array_er32(VMBMEM(0), i); /* Acknowledge receipt and release mailbox, then we're done */ ew32(V2PMAILBOX(0), E1000_V2PMAILBOX_ACK); /* update stats */ hw->mbx.stats.msgs_rx++; out_no_read: return err; }
/** * 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 = er32(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; /* Take ownership of the buffer */ ew32(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; do { /* Take ownership of the buffer */ ew32(V2PMAILBOX(0), E1000_V2PMAILBOX_VFU); /* reserve mailbox for VF use */ if (e1000_read_v2p_mailbox(hw) & E1000_V2PMAILBOX_VFU) { ret_val = 0; break; } udelay(1000); } while (count-- > 0); return ret_val; }