--- /dev/null
+/*
+ * Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that 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 Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <ipxe/io.h>
+#include <ipxe/netdevice.h>
+#include <ipxe/ethernet.h>
+#include "intelvf.h"
+
+/** @file
+ *
+ * Intel 10/100/1000 virtual function network card driver
+ *
+ */
+
+/******************************************************************************
+ *
+ * Mailbox messages
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Write message to mailbox
+ *
+ * @v intel Intel device
+ * @v msg Message
+ */
+static void intelvf_mbox_write ( struct intel_nic *intel,
+ const union intelvf_msg *msg ) {
+ unsigned int i;
+
+ /* Write message */
+ DBGC2 ( intel, "INTEL %p sending message", intel );
+ for ( i = 0 ; i < ( sizeof ( *msg ) / sizeof ( msg->dword[0] ) ) ; i++){
+ DBGC2 ( intel, "%c%08x", ( i ? ':' : ' ' ), msg->dword[i] );
+ writel ( msg->dword[i], ( intel->regs + intel->mbox.mem +
+ ( i * sizeof ( msg->dword[0] ) ) ) );
+ }
+ DBGC2 ( intel, "\n" );
+}
+
+/**
+ * Read message from mailbox
+ *
+ * @v intel Intel device
+ * @v msg Message
+ */
+static void intelvf_mbox_read ( struct intel_nic *intel,
+ union intelvf_msg *msg ) {
+ unsigned int i;
+
+ /* Read message */
+ DBGC2 ( intel, "INTEL %p received message", intel );
+ for ( i = 0 ; i < ( sizeof ( *msg ) / sizeof ( msg->dword[0] ) ) ; i++){
+ msg->dword[i] = readl ( intel->regs + intel->mbox.mem +
+ ( i * sizeof ( msg->dword[0] ) ) );
+ DBGC2 ( intel, "%c%08x", ( i ? ':' : ' ' ), msg->dword[i] );
+ }
+ DBGC2 ( intel, "\n" );
+}
+
+/**
+ * Poll mailbox
+ *
+ * @v intel Intel device
+ * @ret rc Return status code
+ *
+ * Note that polling the mailbox may fail if the underlying PF is
+ * reset.
+ */
+int intelvf_mbox_poll ( struct intel_nic *intel ) {
+ struct intel_mailbox *mbox = &intel->mbox;
+ union intelvf_msg msg;
+ uint32_t ctrl;
+
+ /* Get mailbox status */
+ ctrl = readl ( intel->regs + mbox->ctrl );
+
+ /* Fail if a reset is in progress */
+ if ( ctrl & INTELVF_MBCTRL_RSTI )
+ return -EPIPE;
+
+ /* Acknowledge (and ignore) any received messages */
+ if ( ctrl & INTELVF_MBCTRL_PFSTS ) {
+ intelvf_mbox_read ( intel, &msg );
+ writel ( INTELVF_MBCTRL_ACK, intel->regs + mbox->ctrl );
+ }
+
+ return 0;
+}
+
+/**
+ * Wait for PF reset to complete
+ *
+ * @v intel Intel device
+ * @ret rc Return status code
+ */
+int intelvf_mbox_wait ( struct intel_nic *intel ) {
+ unsigned int i;
+ int rc;
+
+ /* Wait until a poll completes successfully */
+ for ( i = 0 ; i < INTELVF_MBOX_MAX_WAIT_MS ; i++ ) {
+
+ /* Check for successful poll */
+ if ( ( rc = intelvf_mbox_poll ( intel ) ) == 0 )
+ return 0;
+
+ /* Delay */
+ mdelay ( 1 );
+ }
+
+ DBGC ( intel, "INTEL %p timed out waiting for reset\n", intel );
+ return -ETIMEDOUT;
+}
+
+/**
+ * Send/receive mailbox message
+ *
+ * @v intel Intel device
+ * @v msg Message buffer
+ * @ret rc Return status code
+ */
+int intelvf_mbox_msg ( struct intel_nic *intel, union intelvf_msg *msg ) {
+ struct intel_mailbox *mbox = &intel->mbox;
+ uint32_t ctrl;
+ uint32_t seen = 0;
+ unsigned int i;
+
+ /* Sanity check */
+ assert ( ! ( msg->hdr & INTELVF_MSG_RESPONSE ) );
+
+ /* Handle mailbox */
+ for ( i = 0 ; i < INTELVF_MBOX_MAX_WAIT_MS ; i++ ) {
+
+ /* Attempt to claim mailbox, if we have not yet sent
+ * our message.
+ */
+ if ( ! ( seen & INTELVF_MBCTRL_VFU ) )
+ writel ( INTELVF_MBCTRL_VFU, intel->regs + mbox->ctrl );
+
+ /* Get mailbox status and record observed flags */
+ ctrl = readl ( intel->regs + mbox->ctrl );
+ seen |= ctrl;
+
+ /* If a reset is in progress, clear VFU and abort */
+ if ( ctrl & INTELVF_MBCTRL_RSTI ) {
+ writel ( 0, intel->regs + mbox->ctrl );
+ return -EPIPE;
+ }
+
+ /* Write message to mailbox, if applicable. This
+ * potentially overwrites a message sent by the PF (if
+ * the PF has simultaneously released PFU (thus
+ * allowing our VFU) and asserted PFSTS), but that
+ * doesn't really matter since there are no
+ * unsolicited PF->VF messages that require the actual
+ * message content to be observed.
+ */
+ if ( ctrl & INTELVF_MBCTRL_VFU )
+ intelvf_mbox_write ( intel, msg );
+
+ /* Read message from mailbox, if applicable. */
+ if ( ( seen & INTELVF_MBCTRL_VFU ) &&
+ ( seen & INTELVF_MBCTRL_PFACK ) &&
+ ( ctrl & INTELVF_MBCTRL_PFSTS ) )
+ intelvf_mbox_read ( intel, msg );
+
+ /* Acknowledge received message (if applicable),
+ * release VFU lock, and send message (if applicable).
+ */
+ ctrl = ( ( ( ctrl & INTELVF_MBCTRL_PFSTS ) ?
+ INTELVF_MBCTRL_ACK : 0 ) |
+ ( ( ctrl & INTELVF_MBCTRL_VFU ) ?
+ INTELVF_MBCTRL_REQ : 0 ) );
+ writel ( ctrl, intel->regs + mbox->ctrl );
+
+ /* Exit successfully if we have received a response */
+ if ( msg->hdr & INTELVF_MSG_RESPONSE ) {
+
+ /* Sanity check */
+ assert ( seen & INTELVF_MBCTRL_VFU );
+ assert ( seen & INTELVF_MBCTRL_PFACK );
+ assert ( seen & INTELVF_MBCTRL_PFSTS );
+
+ return 0;
+ }
+
+ /* Delay */
+ mdelay ( 1 );
+ }
+
+ DBGC ( intel, "INTEL %p timed out waiting for mailbox (seen %08x)\n",
+ intel, seen );
+ return -ETIMEDOUT;
+}
+
+/**
+ * Send reset message and get initial MAC address
+ *
+ * @v intel Intel device
+ * @v hw_addr Hardware address to fill in, or NULL
+ * @ret rc Return status code
+ */
+int intelvf_mbox_reset ( struct intel_nic *intel, uint8_t *hw_addr ) {
+ union intelvf_msg msg;
+ int rc;
+
+ /* Send reset message */
+ memset ( &msg, 0, sizeof ( msg ) );
+ msg.hdr = INTELVF_MSG_TYPE_RESET;
+ if ( ( rc = intelvf_mbox_msg ( intel, &msg ) ) != 0 ) {
+ DBGC ( intel, "INTEL %p reset failed: %s\n",
+ intel, strerror ( rc ) );
+ return rc;
+ }
+
+ /* Check response */
+ if ( ( msg.hdr & INTELVF_MSG_TYPE_MASK ) != INTELVF_MSG_TYPE_RESET ) {
+ DBGC ( intel, "INTEL %p reset unexpected response:\n", intel );
+ DBGC_HDA ( intel, 0, &msg, sizeof ( msg ) );
+ return -EPROTO;
+ }
+
+ /* Fill in MAC address, if applicable */
+ if ( hw_addr ) {
+ if ( msg.hdr & INTELVF_MSG_ACK ) {
+ memcpy ( hw_addr, msg.mac.mac, sizeof ( msg.mac.mac ) );
+ DBGC ( intel, "INTEL %p reset assigned MAC address "
+ "%s\n", intel, eth_ntoa ( hw_addr ) );
+ } else {
+ eth_random_addr ( hw_addr );
+ DBGC ( intel, "INTEL %p reset generated MAC address "
+ "%s\n", intel, eth_ntoa ( hw_addr ) );
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * Send set MAC address message
+ *
+ * @v intel Intel device
+ * @v ll_addr Link-layer address
+ * @ret rc Return status code
+ */
+int intelvf_mbox_set_mac ( struct intel_nic *intel, const uint8_t *ll_addr ) {
+ union intelvf_msg msg;
+ int rc;
+
+ /* Send set MAC address message */
+ memset ( &msg, 0, sizeof ( msg ) );
+ msg.hdr = INTELVF_MSG_TYPE_SET_MAC;
+ memcpy ( msg.mac.mac, ll_addr, sizeof ( msg.mac.mac ) );
+ if ( ( rc = intelvf_mbox_msg ( intel, &msg ) ) != 0 ) {
+ DBGC ( intel, "INTEL %p set MAC address failed: %s\n",
+ intel, strerror ( rc ) );
+ return rc;
+ }
+
+ /* Check response */
+ if ( ( msg.hdr & INTELVF_MSG_TYPE_MASK ) != INTELVF_MSG_TYPE_SET_MAC ) {
+ DBGC ( intel, "INTEL %p set MAC address unexpected response:\n",
+ intel );
+ DBGC_HDA ( intel, 0, &msg, sizeof ( msg ) );
+ return -EPROTO;
+ }
+
+ /* Check that we were allowed to set the MAC address */
+ if ( ! ( msg.hdr & INTELVF_MSG_ACK ) ) {
+ DBGC ( intel, "INTEL %p set MAC address refused\n", intel );
+ return -EPERM;
+ }
+
+ return 0;
+}
+
+/**
+ * Send set MTU message
+ *
+ * @v intel Intel device
+ * @v mtu Maximum packet size
+ * @ret rc Return status code
+ */
+int intelvf_mbox_set_mtu ( struct intel_nic *intel, size_t mtu ) {
+ union intelvf_msg msg;
+ int rc;
+
+ /* Send set MTU message */
+ memset ( &msg, 0, sizeof ( msg ) );
+ msg.hdr = INTELVF_MSG_TYPE_SET_MTU;
+ msg.mtu.mtu = mtu;
+ if ( ( rc = intelvf_mbox_msg ( intel, &msg ) ) != 0 ) {
+ DBGC ( intel, "INTEL %p set MTU failed: %s\n",
+ intel, strerror ( rc ) );
+ return rc;
+ }
+
+ /* Check response */
+ if ( ( msg.hdr & INTELVF_MSG_TYPE_MASK ) != INTELVF_MSG_TYPE_SET_MTU ) {
+ DBGC ( intel, "INTEL %p set MTU unexpected response:\n",
+ intel );
+ DBGC_HDA ( intel, 0, &msg, sizeof ( msg ) );
+ return -EPROTO;
+ }
+
+ /* Check that we were allowed to set the MTU */
+ if ( ! ( msg.hdr & INTELVF_MSG_ACK ) ) {
+ DBGC ( intel, "INTEL %p set MTU refused\n", intel );
+ return -EPERM;
+ }
+
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff