Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

1 files changed, 398 insertions, 0 deletions

diff --git a/drivers/net/igbvf/vf.c b/drivers/net/igbvf/vf.c
new file mode 100644
index 000000000000..2a4faf9ade69
--- /dev/null
+++ b/drivers/net/igbvf/vf.c
@@ -0,0 +1,398 @@
+/*******************************************************************************
+
+  Intel(R) 82576 Virtual Function Linux driver
+  Copyright(c) 2009 Intel Corporation.
+
+  This program is free software; you can redistribute it and/or modify it
+  under the terms and conditions of the GNU General Public License,
+  version 2, as published by the Free Software Foundation.
+
+  This program is distributed in the hope it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+  more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program; if not, write to the Free Software Foundation, Inc.,
+  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+
+  The full GNU General Public License is included in this distribution in
+  the file called "COPYING".
+
+  Contact Information:
+  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+*******************************************************************************/
+
+
+#include "vf.h"
+
+static s32 e1000_check_for_link_vf(struct e1000_hw *hw);
+static s32 e1000_get_link_up_info_vf(struct e1000_hw *hw, u16 *speed,
+                                     u16 *duplex);
+static s32 e1000_init_hw_vf(struct e1000_hw *hw);
+static s32 e1000_reset_hw_vf(struct e1000_hw *hw);
+
+static void e1000_update_mc_addr_list_vf(struct e1000_hw *hw, u8 *,
+                                         u32, u32, u32);
+static void e1000_rar_set_vf(struct e1000_hw *, u8 *, u32);
+static s32 e1000_read_mac_addr_vf(struct e1000_hw *);
+static s32 e1000_set_vfta_vf(struct e1000_hw *, u16, bool);
+
+/**
+ *  e1000_init_mac_params_vf - Inits MAC params
+ *  @hw: pointer to the HW structure
+ **/
+static s32 e1000_init_mac_params_vf(struct e1000_hw *hw)
+{
+	struct e1000_mac_info *mac = &hw->mac;
+
+	/* VF's have no MTA Registers - PF feature only */
+	mac->mta_reg_count = 128;
+	/* VF's have no access to RAR entries  */
+	mac->rar_entry_count = 1;
+
+	/* Function pointers */
+	/* reset */
+	mac->ops.reset_hw = e1000_reset_hw_vf;
+	/* hw initialization */
+	mac->ops.init_hw = e1000_init_hw_vf;
+	/* check for link */
+	mac->ops.check_for_link = e1000_check_for_link_vf;
+	/* link info */
+	mac->ops.get_link_up_info = e1000_get_link_up_info_vf;
+	/* multicast address update */
+	mac->ops.update_mc_addr_list = e1000_update_mc_addr_list_vf;
+	/* set mac address */
+	mac->ops.rar_set = e1000_rar_set_vf;
+	/* read mac address */
+	mac->ops.read_mac_addr = e1000_read_mac_addr_vf;
+	/* set vlan filter table array */
+	mac->ops.set_vfta = e1000_set_vfta_vf;
+
+	return E1000_SUCCESS;
+}
+
+/**
+ *  e1000_init_function_pointers_vf - Inits function pointers
+ *  @hw: pointer to the HW structure
+ **/
+void e1000_init_function_pointers_vf(struct e1000_hw *hw)
+{
+	hw->mac.ops.init_params = e1000_init_mac_params_vf;
+	hw->mbx.ops.init_params = e1000_init_mbx_params_vf;
+}
+
+/**
+ *  e1000_get_link_up_info_vf - Gets link info.
+ *  @hw: pointer to the HW structure
+ *  @speed: pointer to 16 bit value to store link speed.
+ *  @duplex: pointer to 16 bit value to store duplex.
+ *
+ *  Since we cannot read the PHY and get accurate link info, we must rely upon
+ *  the status register's data which is often stale and inaccurate.
+ **/
+static s32 e1000_get_link_up_info_vf(struct e1000_hw *hw, u16 *speed,
+                                     u16 *duplex)
+{
+	s32 status;
+
+	status = er32(STATUS);
+	if (status & E1000_STATUS_SPEED_1000)
+		*speed = SPEED_1000;
+	else if (status & E1000_STATUS_SPEED_100)
+		*speed = SPEED_100;
+	else
+		*speed = SPEED_10;
+
+	if (status & E1000_STATUS_FD)
+		*duplex = FULL_DUPLEX;
+	else
+		*duplex = HALF_DUPLEX;
+
+	return E1000_SUCCESS;
+}
+
+/**
+ *  e1000_reset_hw_vf - Resets the HW
+ *  @hw: pointer to the HW structure
+ *
+ *  VF's provide a function level reset. This is done using bit 26 of ctrl_reg.
+ *  This is all the reset we can perform on a VF.
+ **/
+static s32 e1000_reset_hw_vf(struct e1000_hw *hw)
+{
+	struct e1000_mbx_info *mbx = &hw->mbx;
+	u32 timeout = E1000_VF_INIT_TIMEOUT;
+	u32 ret_val = -E1000_ERR_MAC_INIT;
+	u32 msgbuf[3];
+	u8 *addr = (u8 *)(&msgbuf[1]);
+	u32 ctrl;
+
+	/* assert vf queue/interrupt reset */
+	ctrl = er32(CTRL);
+	ew32(CTRL, ctrl | E1000_CTRL_RST);
+
+	/* we cannot initialize while the RSTI / RSTD bits are asserted */
+	while (!mbx->ops.check_for_rst(hw) && timeout) {
+		timeout--;
+		udelay(5);
+	}
+
+	if (timeout) {
+		/* mailbox timeout can now become active */
+		mbx->timeout = E1000_VF_MBX_INIT_TIMEOUT;
+
+		/* notify pf of vf reset completion */
+		msgbuf[0] = E1000_VF_RESET;
+		mbx->ops.write_posted(hw, msgbuf, 1);
+
+		msleep(10);
+
+		/* set our "perm_addr" based on info provided by PF */
+		ret_val = mbx->ops.read_posted(hw, msgbuf, 3);
+		if (!ret_val) {
+			if (msgbuf[0] == (E1000_VF_RESET | E1000_VT_MSGTYPE_ACK))
+				memcpy(hw->mac.perm_addr, addr, 6);
+			else
+				ret_val = -E1000_ERR_MAC_INIT;
+		}
+	}
+
+	return ret_val;
+}
+
+/**
+ *  e1000_init_hw_vf - Inits the HW
+ *  @hw: pointer to the HW structure
+ *
+ *  Not much to do here except clear the PF Reset indication if there is one.
+ **/
+static s32 e1000_init_hw_vf(struct e1000_hw *hw)
+{
+	/* attempt to set and restore our mac address */
+	e1000_rar_set_vf(hw, hw->mac.addr, 0);
+
+	return E1000_SUCCESS;
+}
+
+/**
+ *  e1000_hash_mc_addr_vf - Generate a multicast hash value
+ *  @hw: pointer to the HW structure
+ *  @mc_addr: pointer to a multicast address
+ *
+ *  Generates a multicast address hash value which is used to determine
+ *  the multicast filter table array address and new table value.  See
+ *  e1000_mta_set_generic()
+ **/
+static u32 e1000_hash_mc_addr_vf(struct e1000_hw *hw, u8 *mc_addr)
+{
+	u32 hash_value, hash_mask;
+	u8 bit_shift = 0;
+
+	/* Register count multiplied by bits per register */
+	hash_mask = (hw->mac.mta_reg_count * 32) - 1;
+
+	/*
+	 * The bit_shift is the number of left-shifts
+	 * where 0xFF would still fall within the hash mask.
+	 */
+	while (hash_mask >> bit_shift != 0xFF)
+		bit_shift++;
+
+	hash_value = hash_mask & (((mc_addr[4] >> (8 - bit_shift)) |
+	                          (((u16) mc_addr[5]) << bit_shift)));
+
+	return hash_value;
+}
+
+/**
+ *  e1000_update_mc_addr_list_vf - Update Multicast addresses
+ *  @hw: pointer to the HW structure
+ *  @mc_addr_list: array of multicast addresses to program
+ *  @mc_addr_count: number of multicast addresses to program
+ *  @rar_used_count: the first RAR register free to program
+ *  @rar_count: total number of supported Receive Address Registers
+ *
+ *  Updates the Receive Address Registers and Multicast Table Array.
+ *  The caller must have a packed mc_addr_list of multicast addresses.
+ *  The parameter rar_count will usually be hw->mac.rar_entry_count
+ *  unless there are workarounds that change this.
+ **/
+void e1000_update_mc_addr_list_vf(struct e1000_hw *hw,
+                                  u8 *mc_addr_list, u32 mc_addr_count,
+                                  u32 rar_used_count, u32 rar_count)
+{
+	struct e1000_mbx_info *mbx = &hw->mbx;
+	u32 msgbuf[E1000_VFMAILBOX_SIZE];
+	u16 *hash_list = (u16 *)&msgbuf[1];
+	u32 hash_value;
+	u32 cnt, i;
+
+	/* Each entry in the list uses 1 16 bit word.  We have 30
+	 * 16 bit words available in our HW msg buffer (minus 1 for the
+	 * msg type).  That's 30 hash values if we pack 'em right.  If
+	 * there are more than 30 MC addresses to add then punt the
+	 * extras for now and then add code to handle more than 30 later.
+	 * It would be unusual for a server to request that many multi-cast
+	 * addresses except for in large enterprise network environments.
+	 */
+
+	cnt = (mc_addr_count > 30) ? 30 : mc_addr_count;
+	msgbuf[0] = E1000_VF_SET_MULTICAST;
+	msgbuf[0] |= cnt << E1000_VT_MSGINFO_SHIFT;
+
+	for (i = 0; i < cnt; i++) {
+		hash_value = e1000_hash_mc_addr_vf(hw, mc_addr_list);
+		hash_list[i] = hash_value & 0x0FFFF;
+		mc_addr_list += ETH_ADDR_LEN;
+	}
+
+	mbx->ops.write_posted(hw, msgbuf, E1000_VFMAILBOX_SIZE);
+}
+
+/**
+ *  e1000_set_vfta_vf - Set/Unset vlan filter table address
+ *  @hw: pointer to the HW structure
+ *  @vid: determines the vfta register and bit to set/unset
+ *  @set: if true then set bit, else clear bit
+ **/
+static s32 e1000_set_vfta_vf(struct e1000_hw *hw, u16 vid, bool set)
+{
+	struct e1000_mbx_info *mbx = &hw->mbx;
+	u32 msgbuf[2];
+	s32 err;
+
+	msgbuf[0] = E1000_VF_SET_VLAN;
+	msgbuf[1] = vid;
+	/* Setting the 8 bit field MSG INFO to true indicates "add" */
+	if (set)
+		msgbuf[0] |= 1 << E1000_VT_MSGINFO_SHIFT;
+
+	mbx->ops.write_posted(hw, msgbuf, 2);
+
+	err = mbx->ops.read_posted(hw, msgbuf, 2);
+
+	/* if nacked the vlan was rejected */
+	if (!err && (msgbuf[0] == (E1000_VF_SET_VLAN | E1000_VT_MSGTYPE_NACK)))
+		err = -E1000_ERR_MAC_INIT;
+
+	return err;
+}
+
+/** e1000_rlpml_set_vf - Set the maximum receive packet length
+ *  @hw: pointer to the HW structure
+ *  @max_size: value to assign to max frame size
+ **/
+void e1000_rlpml_set_vf(struct e1000_hw *hw, u16 max_size)
+{
+	struct e1000_mbx_info *mbx = &hw->mbx;
+	u32 msgbuf[2];
+
+	msgbuf[0] = E1000_VF_SET_LPE;
+	msgbuf[1] = max_size;
+
+	mbx->ops.write_posted(hw, msgbuf, 2);
+}
+
+/**
+ *  e1000_rar_set_vf - set device MAC address
+ *  @hw: pointer to the HW structure
+ *  @addr: pointer to the receive address
+ *  @index receive address array register
+ **/
+static void e1000_rar_set_vf(struct e1000_hw *hw, u8 * addr, u32 index)
+{
+	struct e1000_mbx_info *mbx = &hw->mbx;
+	u32 msgbuf[3];
+	u8 *msg_addr = (u8 *)(&msgbuf[1]);
+	s32 ret_val;
+
+	memset(msgbuf, 0, 12);
+	msgbuf[0] = E1000_VF_SET_MAC_ADDR;
+	memcpy(msg_addr, addr, 6);
+	ret_val = mbx->ops.write_posted(hw, msgbuf, 3);
+
+	if (!ret_val)
+		ret_val = mbx->ops.read_posted(hw, msgbuf, 3);
+
+	/* if nacked the address was rejected, use "perm_addr" */
+	if (!ret_val &&
+	    (msgbuf[0] == (E1000_VF_SET_MAC_ADDR | E1000_VT_MSGTYPE_NACK)))
+		e1000_read_mac_addr_vf(hw);
+}
+
+/**
+ *  e1000_read_mac_addr_vf - Read device MAC address
+ *  @hw: pointer to the HW structure
+ **/
+static s32 e1000_read_mac_addr_vf(struct e1000_hw *hw)
+{
+	int i;
+
+	for (i = 0; i < ETH_ADDR_LEN; i++)
+		hw->mac.addr[i] = hw->mac.perm_addr[i];
+
+	return E1000_SUCCESS;
+}
+
+/**
+ *  e1000_check_for_link_vf - Check for link for a virtual interface
+ *  @hw: pointer to the HW structure
+ *
+ *  Checks to see if the underlying PF is still talking to the VF and
+ *  if it is then it reports the link state to the hardware, otherwise
+ *  it reports link down and returns an error.
+ **/
+static s32 e1000_check_for_link_vf(struct e1000_hw *hw)
+{
+	struct e1000_mbx_info *mbx = &hw->mbx;
+	struct e1000_mac_info *mac = &hw->mac;
+	s32 ret_val = E1000_SUCCESS;
+	u32 in_msg = 0;
+
+	/*
+	 * We only want to run this if there has been a rst asserted.
+	 * in this case that could mean a link change, device reset,
+	 * or a virtual function reset
+	 */
+
+	/* If we were hit with a reset drop the link */
+	if (!mbx->ops.check_for_rst(hw))
+		mac->get_link_status = true;
+
+	if (!mac->get_link_status)
+		goto out;
+
+	/* if link status is down no point in checking to see if pf is up */
+	if (!(er32(STATUS) & E1000_STATUS_LU))
+		goto out;
+
+	/* if the read failed it could just be a mailbox collision, best wait
+	 * until we are called again and don't report an error */
+	if (mbx->ops.read(hw, &in_msg, 1))
+		goto out;
+
+	/* if incoming message isn't clear to send we are waiting on response */
+	if (!(in_msg & E1000_VT_MSGTYPE_CTS)) {
+		/* message is not CTS and is NACK we must have lost CTS status */
+		if (in_msg & E1000_VT_MSGTYPE_NACK)
+			ret_val = -E1000_ERR_MAC_INIT;
+		goto out;
+	}
+
+	/* the pf is talking, if we timed out in the past we reinit */
+	if (!mbx->timeout) {
+		ret_val = -E1000_ERR_MAC_INIT;
+		goto out;
+	}
+
+	/* if we passed all the tests above then the link is up and we no
+	 * longer need to check for link */
+	mac->get_link_status = false;
+
+out:
+	return ret_val;
+}
+