RDMA/amso1100: Add driver for Ammasso 1100 RNIC
Add a driver for the Ammasso 1100 gigabit ethernet RNIC.
Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/hw/amso1100/c2.c b/drivers/infiniband/hw/amso1100/c2.c
new file mode 100644
index 0000000..9e9120f
--- /dev/null
+++ b/drivers/infiniband/hw/amso1100/c2.c
@@ -0,0 +1,1255 @@
+/*
+ * Copyright (c) 2005 Ammasso, Inc. All rights reserved.
+ * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/pci.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/delay.h>
+#include <linux/ethtool.h>
+#include <linux/mii.h>
+#include <linux/if_vlan.h>
+#include <linux/crc32.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/byteorder.h>
+
+#include <rdma/ib_smi.h>
+#include "c2.h"
+#include "c2_provider.h"
+
+MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
+MODULE_DESCRIPTION("Ammasso AMSO1100 Low-level iWARP Driver");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_VERSION(DRV_VERSION);
+
+static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK
+ | NETIF_MSG_IFUP | NETIF_MSG_IFDOWN;
+
+static int debug = -1; /* defaults above */
+module_param(debug, int, 0);
+MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
+
+static int c2_up(struct net_device *netdev);
+static int c2_down(struct net_device *netdev);
+static int c2_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
+static void c2_tx_interrupt(struct net_device *netdev);
+static void c2_rx_interrupt(struct net_device *netdev);
+static irqreturn_t c2_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static void c2_tx_timeout(struct net_device *netdev);
+static int c2_change_mtu(struct net_device *netdev, int new_mtu);
+static void c2_reset(struct c2_port *c2_port);
+static struct net_device_stats *c2_get_stats(struct net_device *netdev);
+
+static struct pci_device_id c2_pci_table[] = {
+ { PCI_DEVICE(0x18b8, 0xb001) },
+ { 0 }
+};
+
+MODULE_DEVICE_TABLE(pci, c2_pci_table);
+
+static void c2_print_macaddr(struct net_device *netdev)
+{
+ pr_debug("%s: MAC %02X:%02X:%02X:%02X:%02X:%02X, "
+ "IRQ %u\n", netdev->name,
+ netdev->dev_addr[0], netdev->dev_addr[1], netdev->dev_addr[2],
+ netdev->dev_addr[3], netdev->dev_addr[4], netdev->dev_addr[5],
+ netdev->irq);
+}
+
+static void c2_set_rxbufsize(struct c2_port *c2_port)
+{
+ struct net_device *netdev = c2_port->netdev;
+
+ if (netdev->mtu > RX_BUF_SIZE)
+ c2_port->rx_buf_size =
+ netdev->mtu + ETH_HLEN + sizeof(struct c2_rxp_hdr) +
+ NET_IP_ALIGN;
+ else
+ c2_port->rx_buf_size = sizeof(struct c2_rxp_hdr) + RX_BUF_SIZE;
+}
+
+/*
+ * Allocate TX ring elements and chain them together.
+ * One-to-one association of adapter descriptors with ring elements.
+ */
+static int c2_tx_ring_alloc(struct c2_ring *tx_ring, void *vaddr,
+ dma_addr_t base, void __iomem * mmio_txp_ring)
+{
+ struct c2_tx_desc *tx_desc;
+ struct c2_txp_desc __iomem *txp_desc;
+ struct c2_element *elem;
+ int i;
+
+ tx_ring->start = kmalloc(sizeof(*elem) * tx_ring->count, GFP_KERNEL);
+ if (!tx_ring->start)
+ return -ENOMEM;
+
+ elem = tx_ring->start;
+ tx_desc = vaddr;
+ txp_desc = mmio_txp_ring;
+ for (i = 0; i < tx_ring->count; i++, elem++, tx_desc++, txp_desc++) {
+ tx_desc->len = 0;
+ tx_desc->status = 0;
+
+ /* Set TXP_HTXD_UNINIT */
+ __raw_writeq(cpu_to_be64(0x1122334455667788ULL),
+ (void __iomem *) txp_desc + C2_TXP_ADDR);
+ __raw_writew(0, (void __iomem *) txp_desc + C2_TXP_LEN);
+ __raw_writew(cpu_to_be16(TXP_HTXD_UNINIT),
+ (void __iomem *) txp_desc + C2_TXP_FLAGS);
+
+ elem->skb = NULL;
+ elem->ht_desc = tx_desc;
+ elem->hw_desc = txp_desc;
+
+ if (i == tx_ring->count - 1) {
+ elem->next = tx_ring->start;
+ tx_desc->next_offset = base;
+ } else {
+ elem->next = elem + 1;
+ tx_desc->next_offset =
+ base + (i + 1) * sizeof(*tx_desc);
+ }
+ }
+
+ tx_ring->to_use = tx_ring->to_clean = tx_ring->start;
+
+ return 0;
+}
+
+/*
+ * Allocate RX ring elements and chain them together.
+ * One-to-one association of adapter descriptors with ring elements.
+ */
+static int c2_rx_ring_alloc(struct c2_ring *rx_ring, void *vaddr,
+ dma_addr_t base, void __iomem * mmio_rxp_ring)
+{
+ struct c2_rx_desc *rx_desc;
+ struct c2_rxp_desc __iomem *rxp_desc;
+ struct c2_element *elem;
+ int i;
+
+ rx_ring->start = kmalloc(sizeof(*elem) * rx_ring->count, GFP_KERNEL);
+ if (!rx_ring->start)
+ return -ENOMEM;
+
+ elem = rx_ring->start;
+ rx_desc = vaddr;
+ rxp_desc = mmio_rxp_ring;
+ for (i = 0; i < rx_ring->count; i++, elem++, rx_desc++, rxp_desc++) {
+ rx_desc->len = 0;
+ rx_desc->status = 0;
+
+ /* Set RXP_HRXD_UNINIT */
+ __raw_writew(cpu_to_be16(RXP_HRXD_OK),
+ (void __iomem *) rxp_desc + C2_RXP_STATUS);
+ __raw_writew(0, (void __iomem *) rxp_desc + C2_RXP_COUNT);
+ __raw_writew(0, (void __iomem *) rxp_desc + C2_RXP_LEN);
+ __raw_writeq(cpu_to_be64(0x99aabbccddeeffULL),
+ (void __iomem *) rxp_desc + C2_RXP_ADDR);
+ __raw_writew(cpu_to_be16(RXP_HRXD_UNINIT),
+ (void __iomem *) rxp_desc + C2_RXP_FLAGS);
+
+ elem->skb = NULL;
+ elem->ht_desc = rx_desc;
+ elem->hw_desc = rxp_desc;
+
+ if (i == rx_ring->count - 1) {
+ elem->next = rx_ring->start;
+ rx_desc->next_offset = base;
+ } else {
+ elem->next = elem + 1;
+ rx_desc->next_offset =
+ base + (i + 1) * sizeof(*rx_desc);
+ }
+ }
+
+ rx_ring->to_use = rx_ring->to_clean = rx_ring->start;
+
+ return 0;
+}
+
+/* Setup buffer for receiving */
+static inline int c2_rx_alloc(struct c2_port *c2_port, struct c2_element *elem)
+{
+ struct c2_dev *c2dev = c2_port->c2dev;
+ struct c2_rx_desc *rx_desc = elem->ht_desc;
+ struct sk_buff *skb;
+ dma_addr_t mapaddr;
+ u32 maplen;
+ struct c2_rxp_hdr *rxp_hdr;
+
+ skb = dev_alloc_skb(c2_port->rx_buf_size);
+ if (unlikely(!skb)) {
+ pr_debug("%s: out of memory for receive\n",
+ c2_port->netdev->name);
+ return -ENOMEM;
+ }
+
+ /* Zero out the rxp hdr in the sk_buff */
+ memset(skb->data, 0, sizeof(*rxp_hdr));
+
+ skb->dev = c2_port->netdev;
+
+ maplen = c2_port->rx_buf_size;
+ mapaddr =
+ pci_map_single(c2dev->pcidev, skb->data, maplen,
+ PCI_DMA_FROMDEVICE);
+
+ /* Set the sk_buff RXP_header to RXP_HRXD_READY */
+ rxp_hdr = (struct c2_rxp_hdr *) skb->data;
+ rxp_hdr->flags = RXP_HRXD_READY;
+
+ __raw_writew(0, elem->hw_desc + C2_RXP_STATUS);
+ __raw_writew(cpu_to_be16((u16) maplen - sizeof(*rxp_hdr)),
+ elem->hw_desc + C2_RXP_LEN);
+ __raw_writeq(cpu_to_be64(mapaddr), elem->hw_desc + C2_RXP_ADDR);
+ __raw_writew(cpu_to_be16(RXP_HRXD_READY), elem->hw_desc + C2_RXP_FLAGS);
+
+ elem->skb = skb;
+ elem->mapaddr = mapaddr;
+ elem->maplen = maplen;
+ rx_desc->len = maplen;
+
+ return 0;
+}
+
+/*
+ * Allocate buffers for the Rx ring
+ * For receive: rx_ring.to_clean is next received frame
+ */
+static int c2_rx_fill(struct c2_port *c2_port)
+{
+ struct c2_ring *rx_ring = &c2_port->rx_ring;
+ struct c2_element *elem;
+ int ret = 0;
+
+ elem = rx_ring->start;
+ do {
+ if (c2_rx_alloc(c2_port, elem)) {
+ ret = 1;
+ break;
+ }
+ } while ((elem = elem->next) != rx_ring->start);
+
+ rx_ring->to_clean = rx_ring->start;
+ return ret;
+}
+
+/* Free all buffers in RX ring, assumes receiver stopped */
+static void c2_rx_clean(struct c2_port *c2_port)
+{
+ struct c2_dev *c2dev = c2_port->c2dev;
+ struct c2_ring *rx_ring = &c2_port->rx_ring;
+ struct c2_element *elem;
+ struct c2_rx_desc *rx_desc;
+
+ elem = rx_ring->start;
+ do {
+ rx_desc = elem->ht_desc;
+ rx_desc->len = 0;
+
+ __raw_writew(0, elem->hw_desc + C2_RXP_STATUS);
+ __raw_writew(0, elem->hw_desc + C2_RXP_COUNT);
+ __raw_writew(0, elem->hw_desc + C2_RXP_LEN);
+ __raw_writeq(cpu_to_be64(0x99aabbccddeeffULL),
+ elem->hw_desc + C2_RXP_ADDR);
+ __raw_writew(cpu_to_be16(RXP_HRXD_UNINIT),
+ elem->hw_desc + C2_RXP_FLAGS);
+
+ if (elem->skb) {
+ pci_unmap_single(c2dev->pcidev, elem->mapaddr,
+ elem->maplen, PCI_DMA_FROMDEVICE);
+ dev_kfree_skb(elem->skb);
+ elem->skb = NULL;
+ }
+ } while ((elem = elem->next) != rx_ring->start);
+}
+
+static inline int c2_tx_free(struct c2_dev *c2dev, struct c2_element *elem)
+{
+ struct c2_tx_desc *tx_desc = elem->ht_desc;
+
+ tx_desc->len = 0;
+
+ pci_unmap_single(c2dev->pcidev, elem->mapaddr, elem->maplen,
+ PCI_DMA_TODEVICE);
+
+ if (elem->skb) {
+ dev_kfree_skb_any(elem->skb);
+ elem->skb = NULL;
+ }
+
+ return 0;
+}
+
+/* Free all buffers in TX ring, assumes transmitter stopped */
+static void c2_tx_clean(struct c2_port *c2_port)
+{
+ struct c2_ring *tx_ring = &c2_port->tx_ring;
+ struct c2_element *elem;
+ struct c2_txp_desc txp_htxd;
+ int retry;
+ unsigned long flags;
+
+ spin_lock_irqsave(&c2_port->tx_lock, flags);
+
+ elem = tx_ring->start;
+
+ do {
+ retry = 0;
+ do {
+ txp_htxd.flags =
+ readw(elem->hw_desc + C2_TXP_FLAGS);
+
+ if (txp_htxd.flags == TXP_HTXD_READY) {
+ retry = 1;
+ __raw_writew(0,
+ elem->hw_desc + C2_TXP_LEN);
+ __raw_writeq(0,
+ elem->hw_desc + C2_TXP_ADDR);
+ __raw_writew(cpu_to_be16(TXP_HTXD_DONE),
+ elem->hw_desc + C2_TXP_FLAGS);
+ c2_port->netstats.tx_dropped++;
+ break;
+ } else {
+ __raw_writew(0,
+ elem->hw_desc + C2_TXP_LEN);
+ __raw_writeq(cpu_to_be64(0x1122334455667788ULL),
+ elem->hw_desc + C2_TXP_ADDR);
+ __raw_writew(cpu_to_be16(TXP_HTXD_UNINIT),
+ elem->hw_desc + C2_TXP_FLAGS);
+ }
+
+ c2_tx_free(c2_port->c2dev, elem);
+
+ } while ((elem = elem->next) != tx_ring->start);
+ } while (retry);
+
+ c2_port->tx_avail = c2_port->tx_ring.count - 1;
+ c2_port->c2dev->cur_tx = tx_ring->to_use - tx_ring->start;
+
+ if (c2_port->tx_avail > MAX_SKB_FRAGS + 1)
+ netif_wake_queue(c2_port->netdev);
+
+ spin_unlock_irqrestore(&c2_port->tx_lock, flags);
+}
+
+/*
+ * Process transmit descriptors marked 'DONE' by the firmware,
+ * freeing up their unneeded sk_buffs.
+ */
+static void c2_tx_interrupt(struct net_device *netdev)
+{
+ struct c2_port *c2_port = netdev_priv(netdev);
+ struct c2_dev *c2dev = c2_port->c2dev;
+ struct c2_ring *tx_ring = &c2_port->tx_ring;
+ struct c2_element *elem;
+ struct c2_txp_desc txp_htxd;
+
+ spin_lock(&c2_port->tx_lock);
+
+ for (elem = tx_ring->to_clean; elem != tx_ring->to_use;
+ elem = elem->next) {
+ txp_htxd.flags =
+ be16_to_cpu(readw(elem->hw_desc + C2_TXP_FLAGS));
+
+ if (txp_htxd.flags != TXP_HTXD_DONE)
+ break;
+
+ if (netif_msg_tx_done(c2_port)) {
+ /* PCI reads are expensive in fast path */
+ txp_htxd.len =
+ be16_to_cpu(readw(elem->hw_desc + C2_TXP_LEN));
+ pr_debug("%s: tx done slot %3Zu status 0x%x len "
+ "%5u bytes\n",
+ netdev->name, elem - tx_ring->start,
+ txp_htxd.flags, txp_htxd.len);
+ }
+
+ c2_tx_free(c2dev, elem);
+ ++(c2_port->tx_avail);
+ }
+
+ tx_ring->to_clean = elem;
+
+ if (netif_queue_stopped(netdev)
+ && c2_port->tx_avail > MAX_SKB_FRAGS + 1)
+ netif_wake_queue(netdev);
+
+ spin_unlock(&c2_port->tx_lock);
+}
+
+static void c2_rx_error(struct c2_port *c2_port, struct c2_element *elem)
+{
+ struct c2_rx_desc *rx_desc = elem->ht_desc;
+ struct c2_rxp_hdr *rxp_hdr = (struct c2_rxp_hdr *) elem->skb->data;
+
+ if (rxp_hdr->status != RXP_HRXD_OK ||
+ rxp_hdr->len > (rx_desc->len - sizeof(*rxp_hdr))) {
+ pr_debug("BAD RXP_HRXD\n");
+ pr_debug(" rx_desc : %p\n", rx_desc);
+ pr_debug(" index : %Zu\n",
+ elem - c2_port->rx_ring.start);
+ pr_debug(" len : %u\n", rx_desc->len);
+ pr_debug(" rxp_hdr : %p [PA %p]\n", rxp_hdr,
+ (void *) __pa((unsigned long) rxp_hdr));
+ pr_debug(" flags : 0x%x\n", rxp_hdr->flags);
+ pr_debug(" status: 0x%x\n", rxp_hdr->status);
+ pr_debug(" len : %u\n", rxp_hdr->len);
+ pr_debug(" rsvd : 0x%x\n", rxp_hdr->rsvd);
+ }
+
+ /* Setup the skb for reuse since we're dropping this pkt */
+ elem->skb->tail = elem->skb->data = elem->skb->head;
+
+ /* Zero out the rxp hdr in the sk_buff */
+ memset(elem->skb->data, 0, sizeof(*rxp_hdr));
+
+ /* Write the descriptor to the adapter's rx ring */
+ __raw_writew(0, elem->hw_desc + C2_RXP_STATUS);
+ __raw_writew(0, elem->hw_desc + C2_RXP_COUNT);
+ __raw_writew(cpu_to_be16((u16) elem->maplen - sizeof(*rxp_hdr)),
+ elem->hw_desc + C2_RXP_LEN);
+ __raw_writeq(cpu_to_be64(elem->mapaddr), elem->hw_desc + C2_RXP_ADDR);
+ __raw_writew(cpu_to_be16(RXP_HRXD_READY), elem->hw_desc + C2_RXP_FLAGS);
+
+ pr_debug("packet dropped\n");
+ c2_port->netstats.rx_dropped++;
+}
+
+static void c2_rx_interrupt(struct net_device *netdev)
+{
+ struct c2_port *c2_port = netdev_priv(netdev);
+ struct c2_dev *c2dev = c2_port->c2dev;
+ struct c2_ring *rx_ring = &c2_port->rx_ring;
+ struct c2_element *elem;
+ struct c2_rx_desc *rx_desc;
+ struct c2_rxp_hdr *rxp_hdr;
+ struct sk_buff *skb;
+ dma_addr_t mapaddr;
+ u32 maplen, buflen;
+ unsigned long flags;
+
+ spin_lock_irqsave(&c2dev->lock, flags);
+
+ /* Begin where we left off */
+ rx_ring->to_clean = rx_ring->start + c2dev->cur_rx;
+
+ for (elem = rx_ring->to_clean; elem->next != rx_ring->to_clean;
+ elem = elem->next) {
+ rx_desc = elem->ht_desc;
+ mapaddr = elem->mapaddr;
+ maplen = elem->maplen;
+ skb = elem->skb;
+ rxp_hdr = (struct c2_rxp_hdr *) skb->data;
+
+ if (rxp_hdr->flags != RXP_HRXD_DONE)
+ break;
+ buflen = rxp_hdr->len;
+
+ /* Sanity check the RXP header */
+ if (rxp_hdr->status != RXP_HRXD_OK ||
+ buflen > (rx_desc->len - sizeof(*rxp_hdr))) {
+ c2_rx_error(c2_port, elem);
+ continue;
+ }
+
+ /*
+ * Allocate and map a new skb for replenishing the host
+ * RX desc
+ */
+ if (c2_rx_alloc(c2_port, elem)) {
+ c2_rx_error(c2_port, elem);
+ continue;
+ }
+
+ /* Unmap the old skb */
+ pci_unmap_single(c2dev->pcidev, mapaddr, maplen,
+ PCI_DMA_FROMDEVICE);
+
+ prefetch(skb->data);
+
+ /*
+ * Skip past the leading 8 bytes comprising of the
+ * "struct c2_rxp_hdr", prepended by the adapter
+ * to the usual Ethernet header ("struct ethhdr"),
+ * to the start of the raw Ethernet packet.
+ *
+ * Fix up the various fields in the sk_buff before
+ * passing it up to netif_rx(). The transfer size
+ * (in bytes) specified by the adapter len field of
+ * the "struct rxp_hdr_t" does NOT include the
+ * "sizeof(struct c2_rxp_hdr)".
+ */
+ skb->data += sizeof(*rxp_hdr);
+ skb->tail = skb->data + buflen;
+ skb->len = buflen;
+ skb->dev = netdev;
+ skb->protocol = eth_type_trans(skb, netdev);
+
+ netif_rx(skb);
+
+ netdev->last_rx = jiffies;
+ c2_port->netstats.rx_packets++;
+ c2_port->netstats.rx_bytes += buflen;
+ }
+
+ /* Save where we left off */
+ rx_ring->to_clean = elem;
+ c2dev->cur_rx = elem - rx_ring->start;
+ C2_SET_CUR_RX(c2dev, c2dev->cur_rx);
+
+ spin_unlock_irqrestore(&c2dev->lock, flags);
+}
+
+/*
+ * Handle netisr0 TX & RX interrupts.
+ */
+static irqreturn_t c2_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ unsigned int netisr0, dmaisr;
+ int handled = 0;
+ struct c2_dev *c2dev = (struct c2_dev *) dev_id;
+
+ /* Process CCILNET interrupts */
+ netisr0 = readl(c2dev->regs + C2_NISR0);
+ if (netisr0) {
+
+ /*
+ * There is an issue with the firmware that always
+ * provides the status of RX for both TX & RX
+ * interrupts. So process both queues here.
+ */
+ c2_rx_interrupt(c2dev->netdev);
+ c2_tx_interrupt(c2dev->netdev);
+
+ /* Clear the interrupt */
+ writel(netisr0, c2dev->regs + C2_NISR0);
+ handled++;
+ }
+
+ /* Process RNIC interrupts */
+ dmaisr = readl(c2dev->regs + C2_DISR);
+ if (dmaisr) {
+ writel(dmaisr, c2dev->regs + C2_DISR);
+ c2_rnic_interrupt(c2dev);
+ handled++;
+ }
+
+ if (handled) {
+ return IRQ_HANDLED;
+ } else {
+ return IRQ_NONE;
+ }
+}
+
+static int c2_up(struct net_device *netdev)
+{
+ struct c2_port *c2_port = netdev_priv(netdev);
+ struct c2_dev *c2dev = c2_port->c2dev;
+ struct c2_element *elem;
+ struct c2_rxp_hdr *rxp_hdr;
+ struct in_device *in_dev;
+ size_t rx_size, tx_size;
+ int ret, i;
+ unsigned int netimr0;
+
+ if (netif_msg_ifup(c2_port))
+ pr_debug("%s: enabling interface\n", netdev->name);
+
+ /* Set the Rx buffer size based on MTU */
+ c2_set_rxbufsize(c2_port);
+
+ /* Allocate DMA'able memory for Tx/Rx host descriptor rings */
+ rx_size = c2_port->rx_ring.count * sizeof(struct c2_rx_desc);
+ tx_size = c2_port->tx_ring.count * sizeof(struct c2_tx_desc);
+
+ c2_port->mem_size = tx_size + rx_size;
+ c2_port->mem = pci_alloc_consistent(c2dev->pcidev, c2_port->mem_size,
+ &c2_port->dma);
+ if (c2_port->mem == NULL) {
+ pr_debug("Unable to allocate memory for "
+ "host descriptor rings\n");
+ return -ENOMEM;
+ }
+
+ memset(c2_port->mem, 0, c2_port->mem_size);
+
+ /* Create the Rx host descriptor ring */
+ if ((ret =
+ c2_rx_ring_alloc(&c2_port->rx_ring, c2_port->mem, c2_port->dma,
+ c2dev->mmio_rxp_ring))) {
+ pr_debug("Unable to create RX ring\n");
+ goto bail0;
+ }
+
+ /* Allocate Rx buffers for the host descriptor ring */
+ if (c2_rx_fill(c2_port)) {
+ pr_debug("Unable to fill RX ring\n");
+ goto bail1;
+ }
+
+ /* Create the Tx host descriptor ring */
+ if ((ret = c2_tx_ring_alloc(&c2_port->tx_ring, c2_port->mem + rx_size,
+ c2_port->dma + rx_size,
+ c2dev->mmio_txp_ring))) {
+ pr_debug("Unable to create TX ring\n");
+ goto bail1;
+ }
+
+ /* Set the TX pointer to where we left off */
+ c2_port->tx_avail = c2_port->tx_ring.count - 1;
+ c2_port->tx_ring.to_use = c2_port->tx_ring.to_clean =
+ c2_port->tx_ring.start + c2dev->cur_tx;
+
+ /* missing: Initialize MAC */
+
+ BUG_ON(c2_port->tx_ring.to_use != c2_port->tx_ring.to_clean);
+
+ /* Reset the adapter, ensures the driver is in sync with the RXP */
+ c2_reset(c2_port);
+
+ /* Reset the READY bit in the sk_buff RXP headers & adapter HRXDQ */
+ for (i = 0, elem = c2_port->rx_ring.start; i < c2_port->rx_ring.count;
+ i++, elem++) {
+ rxp_hdr = (struct c2_rxp_hdr *) elem->skb->data;
+ rxp_hdr->flags = 0;
+ __raw_writew(cpu_to_be16(RXP_HRXD_READY),
+ elem->hw_desc + C2_RXP_FLAGS);
+ }
+
+ /* Enable network packets */
+ netif_start_queue(netdev);
+
+ /* Enable IRQ */
+ writel(0, c2dev->regs + C2_IDIS);
+ netimr0 = readl(c2dev->regs + C2_NIMR0);
+ netimr0 &= ~(C2_PCI_HTX_INT | C2_PCI_HRX_INT);
+ writel(netimr0, c2dev->regs + C2_NIMR0);
+
+ /* Tell the stack to ignore arp requests for ipaddrs bound to
+ * other interfaces. This is needed to prevent the host stack
+ * from responding to arp requests to the ipaddr bound on the
+ * rdma interface.
+ */
+ in_dev = in_dev_get(netdev);
+ in_dev->cnf.arp_ignore = 1;
+ in_dev_put(in_dev);
+
+ return 0;
+
+ bail1:
+ c2_rx_clean(c2_port);
+ kfree(c2_port->rx_ring.start);
+
+ bail0:
+ pci_free_consistent(c2dev->pcidev, c2_port->mem_size, c2_port->mem,
+ c2_port->dma);
+
+ return ret;
+}
+
+static int c2_down(struct net_device *netdev)
+{
+ struct c2_port *c2_port = netdev_priv(netdev);
+ struct c2_dev *c2dev = c2_port->c2dev;
+
+ if (netif_msg_ifdown(c2_port))
+ pr_debug("%s: disabling interface\n",
+ netdev->name);
+
+ /* Wait for all the queued packets to get sent */
+ c2_tx_interrupt(netdev);
+
+ /* Disable network packets */
+ netif_stop_queue(netdev);
+
+ /* Disable IRQs by clearing the interrupt mask */
+ writel(1, c2dev->regs + C2_IDIS);
+ writel(0, c2dev->regs + C2_NIMR0);
+
+ /* missing: Stop transmitter */
+
+ /* missing: Stop receiver */
+
+ /* Reset the adapter, ensures the driver is in sync with the RXP */
+ c2_reset(c2_port);
+
+ /* missing: Turn off LEDs here */
+
+ /* Free all buffers in the host descriptor rings */
+ c2_tx_clean(c2_port);
+ c2_rx_clean(c2_port);
+
+ /* Free the host descriptor rings */
+ kfree(c2_port->rx_ring.start);
+ kfree(c2_port->tx_ring.start);
+ pci_free_consistent(c2dev->pcidev, c2_port->mem_size, c2_port->mem,
+ c2_port->dma);
+
+ return 0;
+}
+
+static void c2_reset(struct c2_port *c2_port)
+{
+ struct c2_dev *c2dev = c2_port->c2dev;
+ unsigned int cur_rx = c2dev->cur_rx;
+
+ /* Tell the hardware to quiesce */
+ C2_SET_CUR_RX(c2dev, cur_rx | C2_PCI_HRX_QUI);
+
+ /*
+ * The hardware will reset the C2_PCI_HRX_QUI bit once
+ * the RXP is quiesced. Wait 2 seconds for this.
+ */
+ ssleep(2);
+
+ cur_rx = C2_GET_CUR_RX(c2dev);
+
+ if (cur_rx & C2_PCI_HRX_QUI)
+ pr_debug("c2_reset: failed to quiesce the hardware!\n");
+
+ cur_rx &= ~C2_PCI_HRX_QUI;
+
+ c2dev->cur_rx = cur_rx;
+
+ pr_debug("Current RX: %u\n", c2dev->cur_rx);
+}
+
+static int c2_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
+{
+ struct c2_port *c2_port = netdev_priv(netdev);
+ struct c2_dev *c2dev = c2_port->c2dev;
+ struct c2_ring *tx_ring = &c2_port->tx_ring;
+ struct c2_element *elem;
+ dma_addr_t mapaddr;
+ u32 maplen;
+ unsigned long flags;
+ unsigned int i;
+
+ spin_lock_irqsave(&c2_port->tx_lock, flags);
+
+ if (unlikely(c2_port->tx_avail < (skb_shinfo(skb)->nr_frags + 1))) {
+ netif_stop_queue(netdev);
+ spin_unlock_irqrestore(&c2_port->tx_lock, flags);
+
+ pr_debug("%s: Tx ring full when queue awake!\n",
+ netdev->name);
+ return NETDEV_TX_BUSY;
+ }
+
+ maplen = skb_headlen(skb);
+ mapaddr =
+ pci_map_single(c2dev->pcidev, skb->data, maplen, PCI_DMA_TODEVICE);
+
+ elem = tx_ring->to_use;
+ elem->skb = skb;
+ elem->mapaddr = mapaddr;
+ elem->maplen = maplen;
+
+ /* Tell HW to xmit */
+ __raw_writeq(cpu_to_be64(mapaddr), elem->hw_desc + C2_TXP_ADDR);
+ __raw_writew(cpu_to_be16(maplen), elem->hw_desc + C2_TXP_LEN);
+ __raw_writew(cpu_to_be16(TXP_HTXD_READY), elem->hw_desc + C2_TXP_FLAGS);
+
+ c2_port->netstats.tx_packets++;
+ c2_port->netstats.tx_bytes += maplen;
+
+ /* Loop thru additional data fragments and queue them */
+ if (skb_shinfo(skb)->nr_frags) {
+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+ skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+ maplen = frag->size;
+ mapaddr =
+ pci_map_page(c2dev->pcidev, frag->page,
+ frag->page_offset, maplen,
+ PCI_DMA_TODEVICE);
+
+ elem = elem->next;
+ elem->skb = NULL;
+ elem->mapaddr = mapaddr;
+ elem->maplen = maplen;
+
+ /* Tell HW to xmit */
+ __raw_writeq(cpu_to_be64(mapaddr),
+ elem->hw_desc + C2_TXP_ADDR);
+ __raw_writew(cpu_to_be16(maplen),
+ elem->hw_desc + C2_TXP_LEN);
+ __raw_writew(cpu_to_be16(TXP_HTXD_READY),
+ elem->hw_desc + C2_TXP_FLAGS);
+
+ c2_port->netstats.tx_packets++;
+ c2_port->netstats.tx_bytes += maplen;
+ }
+ }
+
+ tx_ring->to_use = elem->next;
+ c2_port->tx_avail -= (skb_shinfo(skb)->nr_frags + 1);
+
+ if (c2_port->tx_avail <= MAX_SKB_FRAGS + 1) {
+ netif_stop_queue(netdev);
+ if (netif_msg_tx_queued(c2_port))
+ pr_debug("%s: transmit queue full\n",
+ netdev->name);
+ }
+
+ spin_unlock_irqrestore(&c2_port->tx_lock, flags);
+
+ netdev->trans_start = jiffies;
+
+ return NETDEV_TX_OK;
+}
+
+static struct net_device_stats *c2_get_stats(struct net_device *netdev)
+{
+ struct c2_port *c2_port = netdev_priv(netdev);
+
+ return &c2_port->netstats;
+}
+
+static void c2_tx_timeout(struct net_device *netdev)
+{
+ struct c2_port *c2_port = netdev_priv(netdev);
+
+ if (netif_msg_timer(c2_port))
+ pr_debug("%s: tx timeout\n", netdev->name);
+
+ c2_tx_clean(c2_port);
+}
+
+static int c2_change_mtu(struct net_device *netdev, int new_mtu)
+{
+ int ret = 0;
+
+ if (new_mtu < ETH_ZLEN || new_mtu > ETH_JUMBO_MTU)
+ return -EINVAL;
+
+ netdev->mtu = new_mtu;
+
+ if (netif_running(netdev)) {
+ c2_down(netdev);
+
+ c2_up(netdev);
+ }
+
+ return ret;
+}
+
+/* Initialize network device */
+static struct net_device *c2_devinit(struct c2_dev *c2dev,
+ void __iomem * mmio_addr)
+{
+ struct c2_port *c2_port = NULL;
+ struct net_device *netdev = alloc_etherdev(sizeof(*c2_port));
+
+ if (!netdev) {
+ pr_debug("c2_port etherdev alloc failed");
+ return NULL;
+ }
+
+ SET_MODULE_OWNER(netdev);
+ SET_NETDEV_DEV(netdev, &c2dev->pcidev->dev);
+
+ netdev->open = c2_up;
+ netdev->stop = c2_down;
+ netdev->hard_start_xmit = c2_xmit_frame;
+ netdev->get_stats = c2_get_stats;
+ netdev->tx_timeout = c2_tx_timeout;
+ netdev->change_mtu = c2_change_mtu;
+ netdev->watchdog_timeo = C2_TX_TIMEOUT;
+ netdev->irq = c2dev->pcidev->irq;
+
+ c2_port = netdev_priv(netdev);
+ c2_port->netdev = netdev;
+ c2_port->c2dev = c2dev;
+ c2_port->msg_enable = netif_msg_init(debug, default_msg);
+ c2_port->tx_ring.count = C2_NUM_TX_DESC;
+ c2_port->rx_ring.count = C2_NUM_RX_DESC;
+
+ spin_lock_init(&c2_port->tx_lock);
+
+ /* Copy our 48-bit ethernet hardware address */
+ memcpy_fromio(netdev->dev_addr, mmio_addr + C2_REGS_ENADDR, 6);
+
+ /* Validate the MAC address */
+ if (!is_valid_ether_addr(netdev->dev_addr)) {
+ pr_debug("Invalid MAC Address\n");
+ c2_print_macaddr(netdev);
+ free_netdev(netdev);
+ return NULL;
+ }
+
+ c2dev->netdev = netdev;
+
+ return netdev;
+}
+
+static int __devinit c2_probe(struct pci_dev *pcidev,
+ const struct pci_device_id *ent)
+{
+ int ret = 0, i;
+ unsigned long reg0_start, reg0_flags, reg0_len;
+ unsigned long reg2_start, reg2_flags, reg2_len;
+ unsigned long reg4_start, reg4_flags, reg4_len;
+ unsigned kva_map_size;
+ struct net_device *netdev = NULL;
+ struct c2_dev *c2dev = NULL;
+ void __iomem *mmio_regs = NULL;
+
+ printk(KERN_INFO PFX "AMSO1100 Gigabit Ethernet driver v%s loaded\n",
+ DRV_VERSION);
+
+ /* Enable PCI device */
+ ret = pci_enable_device(pcidev);
+ if (ret) {
+ printk(KERN_ERR PFX "%s: Unable to enable PCI device\n",
+ pci_name(pcidev));
+ goto bail0;
+ }
+
+ reg0_start = pci_resource_start(pcidev, BAR_0);
+ reg0_len = pci_resource_len(pcidev, BAR_0);
+ reg0_flags = pci_resource_flags(pcidev, BAR_0);
+
+ reg2_start = pci_resource_start(pcidev, BAR_2);
+ reg2_len = pci_resource_len(pcidev, BAR_2);
+ reg2_flags = pci_resource_flags(pcidev, BAR_2);
+
+ reg4_start = pci_resource_start(pcidev, BAR_4);
+ reg4_len = pci_resource_len(pcidev, BAR_4);
+ reg4_flags = pci_resource_flags(pcidev, BAR_4);
+
+ pr_debug("BAR0 size = 0x%lX bytes\n", reg0_len);
+ pr_debug("BAR2 size = 0x%lX bytes\n", reg2_len);
+ pr_debug("BAR4 size = 0x%lX bytes\n", reg4_len);
+
+ /* Make sure PCI base addr are MMIO */
+ if (!(reg0_flags & IORESOURCE_MEM) ||
+ !(reg2_flags & IORESOURCE_MEM) || !(reg4_flags & IORESOURCE_MEM)) {
+ printk(KERN_ERR PFX "PCI regions not an MMIO resource\n");
+ ret = -ENODEV;
+ goto bail1;
+ }
+
+ /* Check for weird/broken PCI region reporting */
+ if ((reg0_len < C2_REG0_SIZE) ||
+ (reg2_len < C2_REG2_SIZE) || (reg4_len < C2_REG4_SIZE)) {
+ printk(KERN_ERR PFX "Invalid PCI region sizes\n");
+ ret = -ENODEV;
+ goto bail1;
+ }
+
+ /* Reserve PCI I/O and memory resources */
+ ret = pci_request_regions(pcidev, DRV_NAME);
+ if (ret) {
+ printk(KERN_ERR PFX "%s: Unable to request regions\n",
+ pci_name(pcidev));
+ goto bail1;
+ }
+
+ if ((sizeof(dma_addr_t) > 4)) {
+ ret = pci_set_dma_mask(pcidev, DMA_64BIT_MASK);
+ if (ret < 0) {
+ printk(KERN_ERR PFX "64b DMA configuration failed\n");
+ goto bail2;
+ }
+ } else {
+ ret = pci_set_dma_mask(pcidev, DMA_32BIT_MASK);
+ if (ret < 0) {
+ printk(KERN_ERR PFX "32b DMA configuration failed\n");
+ goto bail2;
+ }
+ }
+
+ /* Enables bus-mastering on the device */
+ pci_set_master(pcidev);
+
+ /* Remap the adapter PCI registers in BAR4 */
+ mmio_regs = ioremap_nocache(reg4_start + C2_PCI_REGS_OFFSET,
+ sizeof(struct c2_adapter_pci_regs));
+ if (mmio_regs == 0UL) {
+ printk(KERN_ERR PFX
+ "Unable to remap adapter PCI registers in BAR4\n");
+ ret = -EIO;
+ goto bail2;
+ }
+
+ /* Validate PCI regs magic */
+ for (i = 0; i < sizeof(c2_magic); i++) {
+ if (c2_magic[i] != readb(mmio_regs + C2_REGS_MAGIC + i)) {
+ printk(KERN_ERR PFX "Downlevel Firmware boot loader "
+ "[%d/%Zd: got 0x%x, exp 0x%x]. Use the cc_flash "
+ "utility to update your boot loader\n",
+ i + 1, sizeof(c2_magic),
+ readb(mmio_regs + C2_REGS_MAGIC + i),
+ c2_magic[i]);
+ printk(KERN_ERR PFX "Adapter not claimed\n");
+ iounmap(mmio_regs);
+ ret = -EIO;
+ goto bail2;
+ }
+ }
+
+ /* Validate the adapter version */
+ if (be32_to_cpu(readl(mmio_regs + C2_REGS_VERS)) != C2_VERSION) {
+ printk(KERN_ERR PFX "Version mismatch "
+ "[fw=%u, c2=%u], Adapter not claimed\n",
+ be32_to_cpu(readl(mmio_regs + C2_REGS_VERS)),
+ C2_VERSION);
+ ret = -EINVAL;
+ iounmap(mmio_regs);
+ goto bail2;
+ }
+
+ /* Validate the adapter IVN */
+ if (be32_to_cpu(readl(mmio_regs + C2_REGS_IVN)) != C2_IVN) {
+ printk(KERN_ERR PFX "Downlevel FIrmware level. You should be using "
+ "the OpenIB device support kit. "
+ "[fw=0x%x, c2=0x%x], Adapter not claimed\n",
+ be32_to_cpu(readl(mmio_regs + C2_REGS_IVN)),
+ C2_IVN);
+ ret = -EINVAL;
+ iounmap(mmio_regs);
+ goto bail2;
+ }
+
+ /* Allocate hardware structure */
+ c2dev = (struct c2_dev *) ib_alloc_device(sizeof(*c2dev));
+ if (!c2dev) {
+ printk(KERN_ERR PFX "%s: Unable to alloc hardware struct\n",
+ pci_name(pcidev));
+ ret = -ENOMEM;
+ iounmap(mmio_regs);
+ goto bail2;
+ }
+
+ memset(c2dev, 0, sizeof(*c2dev));
+ spin_lock_init(&c2dev->lock);
+ c2dev->pcidev = pcidev;
+ c2dev->cur_tx = 0;
+
+ /* Get the last RX index */
+ c2dev->cur_rx =
+ (be32_to_cpu(readl(mmio_regs + C2_REGS_HRX_CUR)) -
+ 0xffffc000) / sizeof(struct c2_rxp_desc);
+
+ /* Request an interrupt line for the driver */
+ ret = request_irq(pcidev->irq, c2_interrupt, SA_SHIRQ, DRV_NAME, c2dev);
+ if (ret) {
+ printk(KERN_ERR PFX "%s: requested IRQ %u is busy\n",
+ pci_name(pcidev), pcidev->irq);
+ iounmap(mmio_regs);
+ goto bail3;
+ }
+
+ /* Set driver specific data */
+ pci_set_drvdata(pcidev, c2dev);
+
+ /* Initialize network device */
+ if ((netdev = c2_devinit(c2dev, mmio_regs)) == NULL) {
+ iounmap(mmio_regs);
+ goto bail4;
+ }
+
+ /* Save off the actual size prior to unmapping mmio_regs */
+ kva_map_size = be32_to_cpu(readl(mmio_regs + C2_REGS_PCI_WINSIZE));
+
+ /* Unmap the adapter PCI registers in BAR4 */
+ iounmap(mmio_regs);
+
+ /* Register network device */
+ ret = register_netdev(netdev);
+ if (ret) {
+ printk(KERN_ERR PFX "Unable to register netdev, ret = %d\n",
+ ret);
+ goto bail5;
+ }
+
+ /* Disable network packets */
+ netif_stop_queue(netdev);
+
+ /* Remap the adapter HRXDQ PA space to kernel VA space */
+ c2dev->mmio_rxp_ring = ioremap_nocache(reg4_start + C2_RXP_HRXDQ_OFFSET,
+ C2_RXP_HRXDQ_SIZE);
+ if (c2dev->mmio_rxp_ring == 0UL) {
+ printk(KERN_ERR PFX "Unable to remap MMIO HRXDQ region\n");
+ ret = -EIO;
+ goto bail6;
+ }
+
+ /* Remap the adapter HTXDQ PA space to kernel VA space */
+ c2dev->mmio_txp_ring = ioremap_nocache(reg4_start + C2_TXP_HTXDQ_OFFSET,
+ C2_TXP_HTXDQ_SIZE);
+ if (c2dev->mmio_txp_ring == 0UL) {
+ printk(KERN_ERR PFX "Unable to remap MMIO HTXDQ region\n");
+ ret = -EIO;
+ goto bail7;
+ }
+
+ /* Save off the current RX index in the last 4 bytes of the TXP Ring */
+ C2_SET_CUR_RX(c2dev, c2dev->cur_rx);
+
+ /* Remap the PCI registers in adapter BAR0 to kernel VA space */
+ c2dev->regs = ioremap_nocache(reg0_start, reg0_len);
+ if (c2dev->regs == 0UL) {
+ printk(KERN_ERR PFX "Unable to remap BAR0\n");
+ ret = -EIO;
+ goto bail8;
+ }
+
+ /* Remap the PCI registers in adapter BAR4 to kernel VA space */
+ c2dev->pa = reg4_start + C2_PCI_REGS_OFFSET;
+ c2dev->kva = ioremap_nocache(reg4_start + C2_PCI_REGS_OFFSET,
+ kva_map_size);
+ if (c2dev->kva == 0UL) {
+ printk(KERN_ERR PFX "Unable to remap BAR4\n");
+ ret = -EIO;
+ goto bail9;
+ }
+
+ /* Print out the MAC address */
+ c2_print_macaddr(netdev);
+
+ ret = c2_rnic_init(c2dev);
+ if (ret) {
+ printk(KERN_ERR PFX "c2_rnic_init failed: %d\n", ret);
+ goto bail10;
+ }
+
+ c2_register_device(c2dev);
+
+ return 0;
+
+ bail10:
+ iounmap(c2dev->kva);
+
+ bail9:
+ iounmap(c2dev->regs);
+
+ bail8:
+ iounmap(c2dev->mmio_txp_ring);
+
+ bail7:
+ iounmap(c2dev->mmio_rxp_ring);
+
+ bail6:
+ unregister_netdev(netdev);
+
+ bail5:
+ free_netdev(netdev);
+
+ bail4:
+ free_irq(pcidev->irq, c2dev);
+
+ bail3:
+ ib_dealloc_device(&c2dev->ibdev);
+
+ bail2:
+ pci_release_regions(pcidev);
+
+ bail1:
+ pci_disable_device(pcidev);
+
+ bail0:
+ return ret;
+}
+
+static void __devexit c2_remove(struct pci_dev *pcidev)
+{
+ struct c2_dev *c2dev = pci_get_drvdata(pcidev);
+ struct net_device *netdev = c2dev->netdev;
+
+ /* Unregister with OpenIB */
+ c2_unregister_device(c2dev);
+
+ /* Clean up the RNIC resources */
+ c2_rnic_term(c2dev);
+
+ /* Remove network device from the kernel */
+ unregister_netdev(netdev);
+
+ /* Free network device */
+ free_netdev(netdev);
+
+ /* Free the interrupt line */
+ free_irq(pcidev->irq, c2dev);
+
+ /* missing: Turn LEDs off here */
+
+ /* Unmap adapter PA space */
+ iounmap(c2dev->kva);
+ iounmap(c2dev->regs);
+ iounmap(c2dev->mmio_txp_ring);
+ iounmap(c2dev->mmio_rxp_ring);
+
+ /* Free the hardware structure */
+ ib_dealloc_device(&c2dev->ibdev);
+
+ /* Release reserved PCI I/O and memory resources */
+ pci_release_regions(pcidev);
+
+ /* Disable PCI device */
+ pci_disable_device(pcidev);
+
+ /* Clear driver specific data */
+ pci_set_drvdata(pcidev, NULL);
+}
+
+static struct pci_driver c2_pci_driver = {
+ .name = DRV_NAME,
+ .id_table = c2_pci_table,
+ .probe = c2_probe,
+ .remove = __devexit_p(c2_remove),
+};
+
+static int __init c2_init_module(void)
+{
+ return pci_module_init(&c2_pci_driver);
+}
+
+static void __exit c2_exit_module(void)
+{
+ pci_unregister_driver(&c2_pci_driver);
+}
+
+module_init(c2_init_module);
+module_exit(c2_exit_module);