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Diffstat (limited to 'drivers/net/ethernet/intel/igb/e1000_mbx.c')
-rw-r--r--drivers/net/ethernet/intel/igb/e1000_mbx.c475
1 files changed, 475 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/igb/e1000_mbx.c b/drivers/net/ethernet/intel/igb/e1000_mbx.c
new file mode 100644
index 000000000..29383112b
--- /dev/null
+++ b/drivers/net/ethernet/intel/igb/e1000_mbx.c
@@ -0,0 +1,475 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2007 - 2018 Intel Corporation. */
+
+#include "e1000_mbx.h"
+
+/**
+ * igb_read_mbx - Reads a message from the mailbox
+ * @hw: pointer to the HW structure
+ * @msg: The message buffer
+ * @size: Length of buffer
+ * @mbx_id: id of mailbox to read
+ * @unlock: skip locking or not
+ *
+ * returns SUCCESS if it successfully read message from buffer
+ **/
+s32 igb_read_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id,
+ bool unlock)
+{
+ struct e1000_mbx_info *mbx = &hw->mbx;
+ s32 ret_val = -E1000_ERR_MBX;
+
+ /* limit read to size of mailbox */
+ if (size > mbx->size)
+ size = mbx->size;
+
+ if (mbx->ops.read)
+ ret_val = mbx->ops.read(hw, msg, size, mbx_id, unlock);
+
+ return ret_val;
+}
+
+/**
+ * igb_write_mbx - 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
+ **/
+s32 igb_write_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
+{
+ struct e1000_mbx_info *mbx = &hw->mbx;
+ s32 ret_val = 0;
+
+ if (size > mbx->size)
+ ret_val = -E1000_ERR_MBX;
+
+ else if (mbx->ops.write)
+ ret_val = mbx->ops.write(hw, msg, size, mbx_id);
+
+ return ret_val;
+}
+
+/**
+ * igb_check_for_msg - checks to see if someone sent us mail
+ * @hw: pointer to the HW structure
+ * @mbx_id: id of mailbox to check
+ *
+ * returns SUCCESS if the Status bit was found or else ERR_MBX
+ **/
+s32 igb_check_for_msg(struct e1000_hw *hw, u16 mbx_id)
+{
+ struct e1000_mbx_info *mbx = &hw->mbx;
+ s32 ret_val = -E1000_ERR_MBX;
+
+ if (mbx->ops.check_for_msg)
+ ret_val = mbx->ops.check_for_msg(hw, mbx_id);
+
+ return ret_val;
+}
+
+/**
+ * igb_check_for_ack - checks to see if someone sent us ACK
+ * @hw: pointer to the HW structure
+ * @mbx_id: id of mailbox to check
+ *
+ * returns SUCCESS if the Status bit was found or else ERR_MBX
+ **/
+s32 igb_check_for_ack(struct e1000_hw *hw, u16 mbx_id)
+{
+ struct e1000_mbx_info *mbx = &hw->mbx;
+ s32 ret_val = -E1000_ERR_MBX;
+
+ if (mbx->ops.check_for_ack)
+ ret_val = mbx->ops.check_for_ack(hw, mbx_id);
+
+ return ret_val;
+}
+
+/**
+ * igb_check_for_rst - checks to see if other side has reset
+ * @hw: pointer to the HW structure
+ * @mbx_id: id of mailbox to check
+ *
+ * returns SUCCESS if the Status bit was found or else ERR_MBX
+ **/
+s32 igb_check_for_rst(struct e1000_hw *hw, u16 mbx_id)
+{
+ struct e1000_mbx_info *mbx = &hw->mbx;
+ s32 ret_val = -E1000_ERR_MBX;
+
+ if (mbx->ops.check_for_rst)
+ ret_val = mbx->ops.check_for_rst(hw, mbx_id);
+
+ return ret_val;
+}
+
+/**
+ * igb_unlock_mbx - unlock the mailbox
+ * @hw: pointer to the HW structure
+ * @mbx_id: id of mailbox to check
+ *
+ * returns SUCCESS if the mailbox was unlocked or else ERR_MBX
+ **/
+s32 igb_unlock_mbx(struct e1000_hw *hw, u16 mbx_id)
+{
+ struct e1000_mbx_info *mbx = &hw->mbx;
+ s32 ret_val = -E1000_ERR_MBX;
+
+ if (mbx->ops.unlock)
+ ret_val = mbx->ops.unlock(hw, mbx_id);
+
+ return ret_val;
+}
+
+/**
+ * igb_poll_for_msg - Wait for message notification
+ * @hw: pointer to the HW structure
+ * @mbx_id: id of mailbox to write
+ *
+ * returns SUCCESS if it successfully received a message notification
+ **/
+static s32 igb_poll_for_msg(struct e1000_hw *hw, u16 mbx_id)
+{
+ struct e1000_mbx_info *mbx = &hw->mbx;
+ int countdown = mbx->timeout;
+
+ if (!countdown || !mbx->ops.check_for_msg)
+ goto out;
+
+ while (countdown && mbx->ops.check_for_msg(hw, mbx_id)) {
+ countdown--;
+ if (!countdown)
+ break;
+ udelay(mbx->usec_delay);
+ }
+
+ /* if we failed, all future posted messages fail until reset */
+ if (!countdown)
+ mbx->timeout = 0;
+out:
+ return countdown ? 0 : -E1000_ERR_MBX;
+}
+
+/**
+ * igb_poll_for_ack - Wait for message acknowledgement
+ * @hw: pointer to the HW structure
+ * @mbx_id: id of mailbox to write
+ *
+ * returns SUCCESS if it successfully received a message acknowledgement
+ **/
+static s32 igb_poll_for_ack(struct e1000_hw *hw, u16 mbx_id)
+{
+ struct e1000_mbx_info *mbx = &hw->mbx;
+ int countdown = mbx->timeout;
+
+ if (!countdown || !mbx->ops.check_for_ack)
+ goto out;
+
+ while (countdown && mbx->ops.check_for_ack(hw, mbx_id)) {
+ countdown--;
+ if (!countdown)
+ break;
+ udelay(mbx->usec_delay);
+ }
+
+ /* if we failed, all future posted messages fail until reset */
+ if (!countdown)
+ mbx->timeout = 0;
+out:
+ return countdown ? 0 : -E1000_ERR_MBX;
+}
+
+/**
+ * igb_read_posted_mbx - Wait for message notification and receive message
+ * @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 received a message notification and
+ * copied it into the receive buffer.
+ **/
+static s32 igb_read_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size,
+ u16 mbx_id)
+{
+ struct e1000_mbx_info *mbx = &hw->mbx;
+ s32 ret_val = -E1000_ERR_MBX;
+
+ if (!mbx->ops.read)
+ goto out;
+
+ ret_val = igb_poll_for_msg(hw, mbx_id);
+
+ if (!ret_val)
+ ret_val = mbx->ops.read(hw, msg, size, mbx_id, true);
+out:
+ return ret_val;
+}
+
+/**
+ * igb_write_posted_mbx - Write a message to the mailbox, wait for ack
+ * @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 and
+ * received an ack to that message within delay * timeout period
+ **/
+static s32 igb_write_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size,
+ u16 mbx_id)
+{
+ struct e1000_mbx_info *mbx = &hw->mbx;
+ s32 ret_val = -E1000_ERR_MBX;
+
+ /* exit if either we can't write or there isn't a defined timeout */
+ if (!mbx->ops.write || !mbx->timeout)
+ goto out;
+
+ /* send msg */
+ ret_val = mbx->ops.write(hw, msg, size, mbx_id);
+
+ /* if msg sent wait until we receive an ack */
+ if (!ret_val)
+ ret_val = igb_poll_for_ack(hw, mbx_id);
+out:
+ return ret_val;
+}
+
+static s32 igb_check_for_bit_pf(struct e1000_hw *hw, u32 mask)
+{
+ u32 mbvficr = rd32(E1000_MBVFICR);
+ s32 ret_val = -E1000_ERR_MBX;
+
+ if (mbvficr & mask) {
+ ret_val = 0;
+ wr32(E1000_MBVFICR, mask);
+ }
+
+ return ret_val;
+}
+
+/**
+ * igb_check_for_msg_pf - checks to see if the VF has sent mail
+ * @hw: pointer to the HW structure
+ * @vf_number: the VF index
+ *
+ * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
+ **/
+static s32 igb_check_for_msg_pf(struct e1000_hw *hw, u16 vf_number)
+{
+ s32 ret_val = -E1000_ERR_MBX;
+
+ if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFREQ_VF1 << vf_number)) {
+ ret_val = 0;
+ hw->mbx.stats.reqs++;
+ }
+
+ return ret_val;
+}
+
+/**
+ * igb_check_for_ack_pf - checks to see if the VF has ACKed
+ * @hw: pointer to the HW structure
+ * @vf_number: the VF index
+ *
+ * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
+ **/
+static s32 igb_check_for_ack_pf(struct e1000_hw *hw, u16 vf_number)
+{
+ s32 ret_val = -E1000_ERR_MBX;
+
+ if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFACK_VF1 << vf_number)) {
+ ret_val = 0;
+ hw->mbx.stats.acks++;
+ }
+
+ return ret_val;
+}
+
+/**
+ * igb_check_for_rst_pf - checks to see if the VF has reset
+ * @hw: pointer to the HW structure
+ * @vf_number: the VF index
+ *
+ * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
+ **/
+static s32 igb_check_for_rst_pf(struct e1000_hw *hw, u16 vf_number)
+{
+ u32 vflre = rd32(E1000_VFLRE);
+ s32 ret_val = -E1000_ERR_MBX;
+
+ if (vflre & BIT(vf_number)) {
+ ret_val = 0;
+ wr32(E1000_VFLRE, BIT(vf_number));
+ hw->mbx.stats.rsts++;
+ }
+
+ return ret_val;
+}
+
+/**
+ * igb_obtain_mbx_lock_pf - obtain mailbox lock
+ * @hw: pointer to the HW structure
+ * @vf_number: the VF index
+ *
+ * return SUCCESS if we obtained the mailbox lock
+ **/
+static s32 igb_obtain_mbx_lock_pf(struct e1000_hw *hw, u16 vf_number)
+{
+ s32 ret_val = -E1000_ERR_MBX;
+ u32 p2v_mailbox;
+ int count = 10;
+
+ do {
+ /* Take ownership of the buffer */
+ wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);
+
+ /* reserve mailbox for vf use */
+ p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
+ if (p2v_mailbox & E1000_P2VMAILBOX_PFU) {
+ ret_val = 0;
+ break;
+ }
+ udelay(1000);
+ } while (count-- > 0);
+
+ return ret_val;
+}
+
+/**
+ * igb_release_mbx_lock_pf - release mailbox lock
+ * @hw: pointer to the HW structure
+ * @vf_number: the VF index
+ *
+ * return SUCCESS if we released the mailbox lock
+ **/
+static s32 igb_release_mbx_lock_pf(struct e1000_hw *hw, u16 vf_number)
+{
+ u32 p2v_mailbox;
+
+ /* drop PF lock of mailbox, if set */
+ p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
+ if (p2v_mailbox & E1000_P2VMAILBOX_PFU)
+ wr32(E1000_P2VMAILBOX(vf_number),
+ p2v_mailbox & ~E1000_P2VMAILBOX_PFU);
+
+ return 0;
+}
+
+/**
+ * igb_write_mbx_pf - Places a message in the mailbox
+ * @hw: pointer to the HW structure
+ * @msg: The message buffer
+ * @size: Length of buffer
+ * @vf_number: the VF index
+ *
+ * returns SUCCESS if it successfully copied message into the buffer
+ **/
+static s32 igb_write_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
+ u16 vf_number)
+{
+ s32 ret_val;
+ u16 i;
+
+ /* lock the mailbox to prevent pf/vf race condition */
+ ret_val = igb_obtain_mbx_lock_pf(hw, vf_number);
+ if (ret_val)
+ goto out_no_write;
+
+ /* flush msg and acks as we are overwriting the message buffer */
+ igb_check_for_msg_pf(hw, vf_number);
+ igb_check_for_ack_pf(hw, vf_number);
+
+ /* copy the caller specified message to the mailbox memory buffer */
+ for (i = 0; i < size; i++)
+ array_wr32(E1000_VMBMEM(vf_number), i, msg[i]);
+
+ /* Interrupt VF to tell it a message has been sent and release buffer*/
+ wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_STS);
+
+ /* update stats */
+ hw->mbx.stats.msgs_tx++;
+
+out_no_write:
+ return ret_val;
+
+}
+
+/**
+ * igb_read_mbx_pf - Read a message from the mailbox
+ * @hw: pointer to the HW structure
+ * @msg: The message buffer
+ * @size: Length of buffer
+ * @vf_number: the VF index
+ * @unlock: unlock the mailbox when done?
+ *
+ * This function copies a message from the mailbox buffer to the caller's
+ * memory buffer. The presumption is that the caller knows that there was
+ * a message due to a VF request so no polling for message is needed.
+ **/
+static s32 igb_read_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
+ u16 vf_number, bool unlock)
+{
+ s32 ret_val;
+ u16 i;
+
+ /* lock the mailbox to prevent pf/vf race condition */
+ ret_val = igb_obtain_mbx_lock_pf(hw, vf_number);
+ if (ret_val)
+ goto out_no_read;
+
+ /* copy the message to the mailbox memory buffer */
+ for (i = 0; i < size; i++)
+ msg[i] = array_rd32(E1000_VMBMEM(vf_number), i);
+
+ /* Acknowledge the message and release mailbox lock (or not) */
+ if (unlock)
+ wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_ACK);
+ else
+ wr32(E1000_P2VMAILBOX(vf_number),
+ E1000_P2VMAILBOX_ACK | E1000_P2VMAILBOX_PFU);
+
+ /* update stats */
+ hw->mbx.stats.msgs_rx++;
+
+out_no_read:
+ return ret_val;
+}
+
+/**
+ * igb_init_mbx_params_pf - set initial values for pf mailbox
+ * @hw: pointer to the HW structure
+ *
+ * Initializes the hw->mbx struct to correct values for pf mailbox
+ */
+s32 igb_init_mbx_params_pf(struct e1000_hw *hw)
+{
+ struct e1000_mbx_info *mbx = &hw->mbx;
+
+ mbx->timeout = 0;
+ mbx->usec_delay = 0;
+
+ mbx->size = E1000_VFMAILBOX_SIZE;
+
+ mbx->ops.read = igb_read_mbx_pf;
+ mbx->ops.write = igb_write_mbx_pf;
+ mbx->ops.read_posted = igb_read_posted_mbx;
+ mbx->ops.write_posted = igb_write_posted_mbx;
+ mbx->ops.check_for_msg = igb_check_for_msg_pf;
+ mbx->ops.check_for_ack = igb_check_for_ack_pf;
+ mbx->ops.check_for_rst = igb_check_for_rst_pf;
+ mbx->ops.unlock = igb_release_mbx_lock_pf;
+
+ mbx->stats.msgs_tx = 0;
+ mbx->stats.msgs_rx = 0;
+ mbx->stats.reqs = 0;
+ mbx->stats.acks = 0;
+ mbx->stats.rsts = 0;
+
+ return 0;
+}
+