2 * Copyright (c) 2005 Ammasso, Inc. All rights reserved.
3 * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 #include <linux/module.h>
34 #include <linux/moduleparam.h>
35 #include <linux/pci.h>
36 #include <linux/netdevice.h>
37 #include <linux/etherdevice.h>
38 #include <linux/inetdevice.h>
39 #include <linux/delay.h>
40 #include <linux/ethtool.h>
41 #include <linux/mii.h>
42 #include <linux/if_vlan.h>
43 #include <linux/crc32.h>
46 #include <linux/tcp.h>
47 #include <linux/init.h>
48 #include <linux/dma-mapping.h>
49 #include <linux/slab.h>
53 #include <asm/byteorder.h>
55 #include <rdma/ib_smi.h>
57 #include "c2_provider.h"
59 MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
60 MODULE_DESCRIPTION("Ammasso AMSO1100 Low-level iWARP Driver");
61 MODULE_LICENSE("Dual BSD/GPL");
62 MODULE_VERSION(DRV_VERSION);
64 static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK
65 | NETIF_MSG_IFUP | NETIF_MSG_IFDOWN;
67 static int debug = -1; /* defaults above */
68 module_param(debug, int, 0);
69 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
71 static int c2_up(struct net_device *netdev);
72 static int c2_down(struct net_device *netdev);
73 static int c2_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
74 static void c2_tx_interrupt(struct net_device *netdev);
75 static void c2_rx_interrupt(struct net_device *netdev);
76 static irqreturn_t c2_interrupt(int irq, void *dev_id);
77 static void c2_tx_timeout(struct net_device *netdev);
78 static int c2_change_mtu(struct net_device *netdev, int new_mtu);
79 static void c2_reset(struct c2_port *c2_port);
81 static struct pci_device_id c2_pci_table[] = {
82 { PCI_DEVICE(0x18b8, 0xb001) },
86 MODULE_DEVICE_TABLE(pci, c2_pci_table);
88 static void c2_print_macaddr(struct net_device *netdev)
90 pr_debug("%s: MAC %pM, IRQ %u\n", netdev->name, netdev->dev_addr, netdev->irq);
93 static void c2_set_rxbufsize(struct c2_port *c2_port)
95 struct net_device *netdev = c2_port->netdev;
97 if (netdev->mtu > RX_BUF_SIZE)
98 c2_port->rx_buf_size =
99 netdev->mtu + ETH_HLEN + sizeof(struct c2_rxp_hdr) +
102 c2_port->rx_buf_size = sizeof(struct c2_rxp_hdr) + RX_BUF_SIZE;
106 * Allocate TX ring elements and chain them together.
107 * One-to-one association of adapter descriptors with ring elements.
109 static int c2_tx_ring_alloc(struct c2_ring *tx_ring, void *vaddr,
110 dma_addr_t base, void __iomem * mmio_txp_ring)
112 struct c2_tx_desc *tx_desc;
113 struct c2_txp_desc __iomem *txp_desc;
114 struct c2_element *elem;
117 tx_ring->start = kmalloc(sizeof(*elem) * tx_ring->count, GFP_KERNEL);
121 elem = tx_ring->start;
123 txp_desc = mmio_txp_ring;
124 for (i = 0; i < tx_ring->count; i++, elem++, tx_desc++, txp_desc++) {
128 /* Set TXP_HTXD_UNINIT */
129 __raw_writeq((__force u64) cpu_to_be64(0x1122334455667788ULL),
130 (void __iomem *) txp_desc + C2_TXP_ADDR);
131 __raw_writew(0, (void __iomem *) txp_desc + C2_TXP_LEN);
132 __raw_writew((__force u16) cpu_to_be16(TXP_HTXD_UNINIT),
133 (void __iomem *) txp_desc + C2_TXP_FLAGS);
136 elem->ht_desc = tx_desc;
137 elem->hw_desc = txp_desc;
139 if (i == tx_ring->count - 1) {
140 elem->next = tx_ring->start;
141 tx_desc->next_offset = base;
143 elem->next = elem + 1;
144 tx_desc->next_offset =
145 base + (i + 1) * sizeof(*tx_desc);
149 tx_ring->to_use = tx_ring->to_clean = tx_ring->start;
155 * Allocate RX ring elements and chain them together.
156 * One-to-one association of adapter descriptors with ring elements.
158 static int c2_rx_ring_alloc(struct c2_ring *rx_ring, void *vaddr,
159 dma_addr_t base, void __iomem * mmio_rxp_ring)
161 struct c2_rx_desc *rx_desc;
162 struct c2_rxp_desc __iomem *rxp_desc;
163 struct c2_element *elem;
166 rx_ring->start = kmalloc(sizeof(*elem) * rx_ring->count, GFP_KERNEL);
170 elem = rx_ring->start;
172 rxp_desc = mmio_rxp_ring;
173 for (i = 0; i < rx_ring->count; i++, elem++, rx_desc++, rxp_desc++) {
177 /* Set RXP_HRXD_UNINIT */
178 __raw_writew((__force u16) cpu_to_be16(RXP_HRXD_OK),
179 (void __iomem *) rxp_desc + C2_RXP_STATUS);
180 __raw_writew(0, (void __iomem *) rxp_desc + C2_RXP_COUNT);
181 __raw_writew(0, (void __iomem *) rxp_desc + C2_RXP_LEN);
182 __raw_writeq((__force u64) cpu_to_be64(0x99aabbccddeeffULL),
183 (void __iomem *) rxp_desc + C2_RXP_ADDR);
184 __raw_writew((__force u16) cpu_to_be16(RXP_HRXD_UNINIT),
185 (void __iomem *) rxp_desc + C2_RXP_FLAGS);
188 elem->ht_desc = rx_desc;
189 elem->hw_desc = rxp_desc;
191 if (i == rx_ring->count - 1) {
192 elem->next = rx_ring->start;
193 rx_desc->next_offset = base;
195 elem->next = elem + 1;
196 rx_desc->next_offset =
197 base + (i + 1) * sizeof(*rx_desc);
201 rx_ring->to_use = rx_ring->to_clean = rx_ring->start;
206 /* Setup buffer for receiving */
207 static inline int c2_rx_alloc(struct c2_port *c2_port, struct c2_element *elem)
209 struct c2_dev *c2dev = c2_port->c2dev;
210 struct c2_rx_desc *rx_desc = elem->ht_desc;
214 struct c2_rxp_hdr *rxp_hdr;
216 skb = dev_alloc_skb(c2_port->rx_buf_size);
217 if (unlikely(!skb)) {
218 pr_debug("%s: out of memory for receive\n",
219 c2_port->netdev->name);
223 /* Zero out the rxp hdr in the sk_buff */
224 memset(skb->data, 0, sizeof(*rxp_hdr));
226 skb->dev = c2_port->netdev;
228 maplen = c2_port->rx_buf_size;
230 pci_map_single(c2dev->pcidev, skb->data, maplen,
233 /* Set the sk_buff RXP_header to RXP_HRXD_READY */
234 rxp_hdr = (struct c2_rxp_hdr *) skb->data;
235 rxp_hdr->flags = RXP_HRXD_READY;
237 __raw_writew(0, elem->hw_desc + C2_RXP_STATUS);
238 __raw_writew((__force u16) cpu_to_be16((u16) maplen - sizeof(*rxp_hdr)),
239 elem->hw_desc + C2_RXP_LEN);
240 __raw_writeq((__force u64) cpu_to_be64(mapaddr), elem->hw_desc + C2_RXP_ADDR);
241 __raw_writew((__force u16) cpu_to_be16(RXP_HRXD_READY),
242 elem->hw_desc + C2_RXP_FLAGS);
245 elem->mapaddr = mapaddr;
246 elem->maplen = maplen;
247 rx_desc->len = maplen;
253 * Allocate buffers for the Rx ring
254 * For receive: rx_ring.to_clean is next received frame
256 static int c2_rx_fill(struct c2_port *c2_port)
258 struct c2_ring *rx_ring = &c2_port->rx_ring;
259 struct c2_element *elem;
262 elem = rx_ring->start;
264 if (c2_rx_alloc(c2_port, elem)) {
268 } while ((elem = elem->next) != rx_ring->start);
270 rx_ring->to_clean = rx_ring->start;
274 /* Free all buffers in RX ring, assumes receiver stopped */
275 static void c2_rx_clean(struct c2_port *c2_port)
277 struct c2_dev *c2dev = c2_port->c2dev;
278 struct c2_ring *rx_ring = &c2_port->rx_ring;
279 struct c2_element *elem;
280 struct c2_rx_desc *rx_desc;
282 elem = rx_ring->start;
284 rx_desc = elem->ht_desc;
287 __raw_writew(0, elem->hw_desc + C2_RXP_STATUS);
288 __raw_writew(0, elem->hw_desc + C2_RXP_COUNT);
289 __raw_writew(0, elem->hw_desc + C2_RXP_LEN);
290 __raw_writeq((__force u64) cpu_to_be64(0x99aabbccddeeffULL),
291 elem->hw_desc + C2_RXP_ADDR);
292 __raw_writew((__force u16) cpu_to_be16(RXP_HRXD_UNINIT),
293 elem->hw_desc + C2_RXP_FLAGS);
296 pci_unmap_single(c2dev->pcidev, elem->mapaddr,
297 elem->maplen, PCI_DMA_FROMDEVICE);
298 dev_kfree_skb(elem->skb);
301 } while ((elem = elem->next) != rx_ring->start);
304 static inline int c2_tx_free(struct c2_dev *c2dev, struct c2_element *elem)
306 struct c2_tx_desc *tx_desc = elem->ht_desc;
310 pci_unmap_single(c2dev->pcidev, elem->mapaddr, elem->maplen,
314 dev_kfree_skb_any(elem->skb);
321 /* Free all buffers in TX ring, assumes transmitter stopped */
322 static void c2_tx_clean(struct c2_port *c2_port)
324 struct c2_ring *tx_ring = &c2_port->tx_ring;
325 struct c2_element *elem;
326 struct c2_txp_desc txp_htxd;
330 spin_lock_irqsave(&c2_port->tx_lock, flags);
332 elem = tx_ring->start;
338 readw(elem->hw_desc + C2_TXP_FLAGS);
340 if (txp_htxd.flags == TXP_HTXD_READY) {
343 elem->hw_desc + C2_TXP_LEN);
345 elem->hw_desc + C2_TXP_ADDR);
346 __raw_writew((__force u16) cpu_to_be16(TXP_HTXD_DONE),
347 elem->hw_desc + C2_TXP_FLAGS);
348 c2_port->netdev->stats.tx_dropped++;
352 elem->hw_desc + C2_TXP_LEN);
353 __raw_writeq((__force u64) cpu_to_be64(0x1122334455667788ULL),
354 elem->hw_desc + C2_TXP_ADDR);
355 __raw_writew((__force u16) cpu_to_be16(TXP_HTXD_UNINIT),
356 elem->hw_desc + C2_TXP_FLAGS);
359 c2_tx_free(c2_port->c2dev, elem);
361 } while ((elem = elem->next) != tx_ring->start);
364 c2_port->tx_avail = c2_port->tx_ring.count - 1;
365 c2_port->c2dev->cur_tx = tx_ring->to_use - tx_ring->start;
367 if (c2_port->tx_avail > MAX_SKB_FRAGS + 1)
368 netif_wake_queue(c2_port->netdev);
370 spin_unlock_irqrestore(&c2_port->tx_lock, flags);
374 * Process transmit descriptors marked 'DONE' by the firmware,
375 * freeing up their unneeded sk_buffs.
377 static void c2_tx_interrupt(struct net_device *netdev)
379 struct c2_port *c2_port = netdev_priv(netdev);
380 struct c2_dev *c2dev = c2_port->c2dev;
381 struct c2_ring *tx_ring = &c2_port->tx_ring;
382 struct c2_element *elem;
383 struct c2_txp_desc txp_htxd;
385 spin_lock(&c2_port->tx_lock);
387 for (elem = tx_ring->to_clean; elem != tx_ring->to_use;
390 be16_to_cpu((__force __be16) readw(elem->hw_desc + C2_TXP_FLAGS));
392 if (txp_htxd.flags != TXP_HTXD_DONE)
395 if (netif_msg_tx_done(c2_port)) {
396 /* PCI reads are expensive in fast path */
398 be16_to_cpu((__force __be16) readw(elem->hw_desc + C2_TXP_LEN));
399 pr_debug("%s: tx done slot %3Zu status 0x%x len "
401 netdev->name, elem - tx_ring->start,
402 txp_htxd.flags, txp_htxd.len);
405 c2_tx_free(c2dev, elem);
406 ++(c2_port->tx_avail);
409 tx_ring->to_clean = elem;
411 if (netif_queue_stopped(netdev)
412 && c2_port->tx_avail > MAX_SKB_FRAGS + 1)
413 netif_wake_queue(netdev);
415 spin_unlock(&c2_port->tx_lock);
418 static void c2_rx_error(struct c2_port *c2_port, struct c2_element *elem)
420 struct c2_rx_desc *rx_desc = elem->ht_desc;
421 struct c2_rxp_hdr *rxp_hdr = (struct c2_rxp_hdr *) elem->skb->data;
423 if (rxp_hdr->status != RXP_HRXD_OK ||
424 rxp_hdr->len > (rx_desc->len - sizeof(*rxp_hdr))) {
425 pr_debug("BAD RXP_HRXD\n");
426 pr_debug(" rx_desc : %p\n", rx_desc);
427 pr_debug(" index : %Zu\n",
428 elem - c2_port->rx_ring.start);
429 pr_debug(" len : %u\n", rx_desc->len);
430 pr_debug(" rxp_hdr : %p [PA %p]\n", rxp_hdr,
431 (void *) __pa((unsigned long) rxp_hdr));
432 pr_debug(" flags : 0x%x\n", rxp_hdr->flags);
433 pr_debug(" status: 0x%x\n", rxp_hdr->status);
434 pr_debug(" len : %u\n", rxp_hdr->len);
435 pr_debug(" rsvd : 0x%x\n", rxp_hdr->rsvd);
438 /* Setup the skb for reuse since we're dropping this pkt */
439 elem->skb->data = elem->skb->head;
440 skb_reset_tail_pointer(elem->skb);
442 /* Zero out the rxp hdr in the sk_buff */
443 memset(elem->skb->data, 0, sizeof(*rxp_hdr));
445 /* Write the descriptor to the adapter's rx ring */
446 __raw_writew(0, elem->hw_desc + C2_RXP_STATUS);
447 __raw_writew(0, elem->hw_desc + C2_RXP_COUNT);
448 __raw_writew((__force u16) cpu_to_be16((u16) elem->maplen - sizeof(*rxp_hdr)),
449 elem->hw_desc + C2_RXP_LEN);
450 __raw_writeq((__force u64) cpu_to_be64(elem->mapaddr),
451 elem->hw_desc + C2_RXP_ADDR);
452 __raw_writew((__force u16) cpu_to_be16(RXP_HRXD_READY),
453 elem->hw_desc + C2_RXP_FLAGS);
455 pr_debug("packet dropped\n");
456 c2_port->netdev->stats.rx_dropped++;
459 static void c2_rx_interrupt(struct net_device *netdev)
461 struct c2_port *c2_port = netdev_priv(netdev);
462 struct c2_dev *c2dev = c2_port->c2dev;
463 struct c2_ring *rx_ring = &c2_port->rx_ring;
464 struct c2_element *elem;
465 struct c2_rx_desc *rx_desc;
466 struct c2_rxp_hdr *rxp_hdr;
472 spin_lock_irqsave(&c2dev->lock, flags);
474 /* Begin where we left off */
475 rx_ring->to_clean = rx_ring->start + c2dev->cur_rx;
477 for (elem = rx_ring->to_clean; elem->next != rx_ring->to_clean;
479 rx_desc = elem->ht_desc;
480 mapaddr = elem->mapaddr;
481 maplen = elem->maplen;
483 rxp_hdr = (struct c2_rxp_hdr *) skb->data;
485 if (rxp_hdr->flags != RXP_HRXD_DONE)
487 buflen = rxp_hdr->len;
489 /* Sanity check the RXP header */
490 if (rxp_hdr->status != RXP_HRXD_OK ||
491 buflen > (rx_desc->len - sizeof(*rxp_hdr))) {
492 c2_rx_error(c2_port, elem);
497 * Allocate and map a new skb for replenishing the host
500 if (c2_rx_alloc(c2_port, elem)) {
501 c2_rx_error(c2_port, elem);
505 /* Unmap the old skb */
506 pci_unmap_single(c2dev->pcidev, mapaddr, maplen,
512 * Skip past the leading 8 bytes comprising of the
513 * "struct c2_rxp_hdr", prepended by the adapter
514 * to the usual Ethernet header ("struct ethhdr"),
515 * to the start of the raw Ethernet packet.
517 * Fix up the various fields in the sk_buff before
518 * passing it up to netif_rx(). The transfer size
519 * (in bytes) specified by the adapter len field of
520 * the "struct rxp_hdr_t" does NOT include the
521 * "sizeof(struct c2_rxp_hdr)".
523 skb->data += sizeof(*rxp_hdr);
524 skb_set_tail_pointer(skb, buflen);
526 skb->protocol = eth_type_trans(skb, netdev);
530 netdev->stats.rx_packets++;
531 netdev->stats.rx_bytes += buflen;
534 /* Save where we left off */
535 rx_ring->to_clean = elem;
536 c2dev->cur_rx = elem - rx_ring->start;
537 C2_SET_CUR_RX(c2dev, c2dev->cur_rx);
539 spin_unlock_irqrestore(&c2dev->lock, flags);
543 * Handle netisr0 TX & RX interrupts.
545 static irqreturn_t c2_interrupt(int irq, void *dev_id)
547 unsigned int netisr0, dmaisr;
549 struct c2_dev *c2dev = (struct c2_dev *) dev_id;
551 /* Process CCILNET interrupts */
552 netisr0 = readl(c2dev->regs + C2_NISR0);
556 * There is an issue with the firmware that always
557 * provides the status of RX for both TX & RX
558 * interrupts. So process both queues here.
560 c2_rx_interrupt(c2dev->netdev);
561 c2_tx_interrupt(c2dev->netdev);
563 /* Clear the interrupt */
564 writel(netisr0, c2dev->regs + C2_NISR0);
568 /* Process RNIC interrupts */
569 dmaisr = readl(c2dev->regs + C2_DISR);
571 writel(dmaisr, c2dev->regs + C2_DISR);
572 c2_rnic_interrupt(c2dev);
583 static int c2_up(struct net_device *netdev)
585 struct c2_port *c2_port = netdev_priv(netdev);
586 struct c2_dev *c2dev = c2_port->c2dev;
587 struct c2_element *elem;
588 struct c2_rxp_hdr *rxp_hdr;
589 struct in_device *in_dev;
590 size_t rx_size, tx_size;
592 unsigned int netimr0;
594 if (netif_msg_ifup(c2_port))
595 pr_debug("%s: enabling interface\n", netdev->name);
597 /* Set the Rx buffer size based on MTU */
598 c2_set_rxbufsize(c2_port);
600 /* Allocate DMA'able memory for Tx/Rx host descriptor rings */
601 rx_size = c2_port->rx_ring.count * sizeof(struct c2_rx_desc);
602 tx_size = c2_port->tx_ring.count * sizeof(struct c2_tx_desc);
604 c2_port->mem_size = tx_size + rx_size;
605 c2_port->mem = pci_alloc_consistent(c2dev->pcidev, c2_port->mem_size,
607 if (c2_port->mem == NULL) {
608 pr_debug("Unable to allocate memory for "
609 "host descriptor rings\n");
613 memset(c2_port->mem, 0, c2_port->mem_size);
615 /* Create the Rx host descriptor ring */
617 c2_rx_ring_alloc(&c2_port->rx_ring, c2_port->mem, c2_port->dma,
618 c2dev->mmio_rxp_ring))) {
619 pr_debug("Unable to create RX ring\n");
623 /* Allocate Rx buffers for the host descriptor ring */
624 if (c2_rx_fill(c2_port)) {
625 pr_debug("Unable to fill RX ring\n");
629 /* Create the Tx host descriptor ring */
630 if ((ret = c2_tx_ring_alloc(&c2_port->tx_ring, c2_port->mem + rx_size,
631 c2_port->dma + rx_size,
632 c2dev->mmio_txp_ring))) {
633 pr_debug("Unable to create TX ring\n");
637 /* Set the TX pointer to where we left off */
638 c2_port->tx_avail = c2_port->tx_ring.count - 1;
639 c2_port->tx_ring.to_use = c2_port->tx_ring.to_clean =
640 c2_port->tx_ring.start + c2dev->cur_tx;
642 /* missing: Initialize MAC */
644 BUG_ON(c2_port->tx_ring.to_use != c2_port->tx_ring.to_clean);
646 /* Reset the adapter, ensures the driver is in sync with the RXP */
649 /* Reset the READY bit in the sk_buff RXP headers & adapter HRXDQ */
650 for (i = 0, elem = c2_port->rx_ring.start; i < c2_port->rx_ring.count;
652 rxp_hdr = (struct c2_rxp_hdr *) elem->skb->data;
654 __raw_writew((__force u16) cpu_to_be16(RXP_HRXD_READY),
655 elem->hw_desc + C2_RXP_FLAGS);
658 /* Enable network packets */
659 netif_start_queue(netdev);
662 writel(0, c2dev->regs + C2_IDIS);
663 netimr0 = readl(c2dev->regs + C2_NIMR0);
664 netimr0 &= ~(C2_PCI_HTX_INT | C2_PCI_HRX_INT);
665 writel(netimr0, c2dev->regs + C2_NIMR0);
667 /* Tell the stack to ignore arp requests for ipaddrs bound to
668 * other interfaces. This is needed to prevent the host stack
669 * from responding to arp requests to the ipaddr bound on the
672 in_dev = in_dev_get(netdev);
673 IN_DEV_CONF_SET(in_dev, ARP_IGNORE, 1);
679 c2_rx_clean(c2_port);
680 kfree(c2_port->rx_ring.start);
683 pci_free_consistent(c2dev->pcidev, c2_port->mem_size, c2_port->mem,
689 static int c2_down(struct net_device *netdev)
691 struct c2_port *c2_port = netdev_priv(netdev);
692 struct c2_dev *c2dev = c2_port->c2dev;
694 if (netif_msg_ifdown(c2_port))
695 pr_debug("%s: disabling interface\n",
698 /* Wait for all the queued packets to get sent */
699 c2_tx_interrupt(netdev);
701 /* Disable network packets */
702 netif_stop_queue(netdev);
704 /* Disable IRQs by clearing the interrupt mask */
705 writel(1, c2dev->regs + C2_IDIS);
706 writel(0, c2dev->regs + C2_NIMR0);
708 /* missing: Stop transmitter */
710 /* missing: Stop receiver */
712 /* Reset the adapter, ensures the driver is in sync with the RXP */
715 /* missing: Turn off LEDs here */
717 /* Free all buffers in the host descriptor rings */
718 c2_tx_clean(c2_port);
719 c2_rx_clean(c2_port);
721 /* Free the host descriptor rings */
722 kfree(c2_port->rx_ring.start);
723 kfree(c2_port->tx_ring.start);
724 pci_free_consistent(c2dev->pcidev, c2_port->mem_size, c2_port->mem,
730 static void c2_reset(struct c2_port *c2_port)
732 struct c2_dev *c2dev = c2_port->c2dev;
733 unsigned int cur_rx = c2dev->cur_rx;
735 /* Tell the hardware to quiesce */
736 C2_SET_CUR_RX(c2dev, cur_rx | C2_PCI_HRX_QUI);
739 * The hardware will reset the C2_PCI_HRX_QUI bit once
740 * the RXP is quiesced. Wait 2 seconds for this.
744 cur_rx = C2_GET_CUR_RX(c2dev);
746 if (cur_rx & C2_PCI_HRX_QUI)
747 pr_debug("c2_reset: failed to quiesce the hardware!\n");
749 cur_rx &= ~C2_PCI_HRX_QUI;
751 c2dev->cur_rx = cur_rx;
753 pr_debug("Current RX: %u\n", c2dev->cur_rx);
756 static int c2_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
758 struct c2_port *c2_port = netdev_priv(netdev);
759 struct c2_dev *c2dev = c2_port->c2dev;
760 struct c2_ring *tx_ring = &c2_port->tx_ring;
761 struct c2_element *elem;
767 spin_lock_irqsave(&c2_port->tx_lock, flags);
769 if (unlikely(c2_port->tx_avail < (skb_shinfo(skb)->nr_frags + 1))) {
770 netif_stop_queue(netdev);
771 spin_unlock_irqrestore(&c2_port->tx_lock, flags);
773 pr_debug("%s: Tx ring full when queue awake!\n",
775 return NETDEV_TX_BUSY;
778 maplen = skb_headlen(skb);
780 pci_map_single(c2dev->pcidev, skb->data, maplen, PCI_DMA_TODEVICE);
782 elem = tx_ring->to_use;
784 elem->mapaddr = mapaddr;
785 elem->maplen = maplen;
787 /* Tell HW to xmit */
788 __raw_writeq((__force u64) cpu_to_be64(mapaddr),
789 elem->hw_desc + C2_TXP_ADDR);
790 __raw_writew((__force u16) cpu_to_be16(maplen),
791 elem->hw_desc + C2_TXP_LEN);
792 __raw_writew((__force u16) cpu_to_be16(TXP_HTXD_READY),
793 elem->hw_desc + C2_TXP_FLAGS);
795 netdev->stats.tx_packets++;
796 netdev->stats.tx_bytes += maplen;
798 /* Loop thru additional data fragments and queue them */
799 if (skb_shinfo(skb)->nr_frags) {
800 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
801 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
804 pci_map_page(c2dev->pcidev, frag->page,
805 frag->page_offset, maplen,
810 elem->mapaddr = mapaddr;
811 elem->maplen = maplen;
813 /* Tell HW to xmit */
814 __raw_writeq((__force u64) cpu_to_be64(mapaddr),
815 elem->hw_desc + C2_TXP_ADDR);
816 __raw_writew((__force u16) cpu_to_be16(maplen),
817 elem->hw_desc + C2_TXP_LEN);
818 __raw_writew((__force u16) cpu_to_be16(TXP_HTXD_READY),
819 elem->hw_desc + C2_TXP_FLAGS);
821 netdev->stats.tx_packets++;
822 netdev->stats.tx_bytes += maplen;
826 tx_ring->to_use = elem->next;
827 c2_port->tx_avail -= (skb_shinfo(skb)->nr_frags + 1);
829 if (c2_port->tx_avail <= MAX_SKB_FRAGS + 1) {
830 netif_stop_queue(netdev);
831 if (netif_msg_tx_queued(c2_port))
832 pr_debug("%s: transmit queue full\n",
836 spin_unlock_irqrestore(&c2_port->tx_lock, flags);
838 netdev->trans_start = jiffies;
843 static void c2_tx_timeout(struct net_device *netdev)
845 struct c2_port *c2_port = netdev_priv(netdev);
847 if (netif_msg_timer(c2_port))
848 pr_debug("%s: tx timeout\n", netdev->name);
850 c2_tx_clean(c2_port);
853 static int c2_change_mtu(struct net_device *netdev, int new_mtu)
857 if (new_mtu < ETH_ZLEN || new_mtu > ETH_JUMBO_MTU)
860 netdev->mtu = new_mtu;
862 if (netif_running(netdev)) {
871 static const struct net_device_ops c2_netdev = {
874 .ndo_start_xmit = c2_xmit_frame,
875 .ndo_tx_timeout = c2_tx_timeout,
876 .ndo_change_mtu = c2_change_mtu,
877 .ndo_set_mac_address = eth_mac_addr,
878 .ndo_validate_addr = eth_validate_addr,
881 /* Initialize network device */
882 static struct net_device *c2_devinit(struct c2_dev *c2dev,
883 void __iomem * mmio_addr)
885 struct c2_port *c2_port = NULL;
886 struct net_device *netdev = alloc_etherdev(sizeof(*c2_port));
889 pr_debug("c2_port etherdev alloc failed");
893 SET_NETDEV_DEV(netdev, &c2dev->pcidev->dev);
895 netdev->netdev_ops = &c2_netdev;
896 netdev->watchdog_timeo = C2_TX_TIMEOUT;
897 netdev->irq = c2dev->pcidev->irq;
899 c2_port = netdev_priv(netdev);
900 c2_port->netdev = netdev;
901 c2_port->c2dev = c2dev;
902 c2_port->msg_enable = netif_msg_init(debug, default_msg);
903 c2_port->tx_ring.count = C2_NUM_TX_DESC;
904 c2_port->rx_ring.count = C2_NUM_RX_DESC;
906 spin_lock_init(&c2_port->tx_lock);
908 /* Copy our 48-bit ethernet hardware address */
909 memcpy_fromio(netdev->dev_addr, mmio_addr + C2_REGS_ENADDR, 6);
911 /* Validate the MAC address */
912 if (!is_valid_ether_addr(netdev->dev_addr)) {
913 pr_debug("Invalid MAC Address\n");
914 c2_print_macaddr(netdev);
919 c2dev->netdev = netdev;
924 static int __devinit c2_probe(struct pci_dev *pcidev,
925 const struct pci_device_id *ent)
928 unsigned long reg0_start, reg0_flags, reg0_len;
929 unsigned long reg2_start, reg2_flags, reg2_len;
930 unsigned long reg4_start, reg4_flags, reg4_len;
931 unsigned kva_map_size;
932 struct net_device *netdev = NULL;
933 struct c2_dev *c2dev = NULL;
934 void __iomem *mmio_regs = NULL;
936 printk(KERN_INFO PFX "AMSO1100 Gigabit Ethernet driver v%s loaded\n",
939 /* Enable PCI device */
940 ret = pci_enable_device(pcidev);
942 printk(KERN_ERR PFX "%s: Unable to enable PCI device\n",
947 reg0_start = pci_resource_start(pcidev, BAR_0);
948 reg0_len = pci_resource_len(pcidev, BAR_0);
949 reg0_flags = pci_resource_flags(pcidev, BAR_0);
951 reg2_start = pci_resource_start(pcidev, BAR_2);
952 reg2_len = pci_resource_len(pcidev, BAR_2);
953 reg2_flags = pci_resource_flags(pcidev, BAR_2);
955 reg4_start = pci_resource_start(pcidev, BAR_4);
956 reg4_len = pci_resource_len(pcidev, BAR_4);
957 reg4_flags = pci_resource_flags(pcidev, BAR_4);
959 pr_debug("BAR0 size = 0x%lX bytes\n", reg0_len);
960 pr_debug("BAR2 size = 0x%lX bytes\n", reg2_len);
961 pr_debug("BAR4 size = 0x%lX bytes\n", reg4_len);
963 /* Make sure PCI base addr are MMIO */
964 if (!(reg0_flags & IORESOURCE_MEM) ||
965 !(reg2_flags & IORESOURCE_MEM) || !(reg4_flags & IORESOURCE_MEM)) {
966 printk(KERN_ERR PFX "PCI regions not an MMIO resource\n");
971 /* Check for weird/broken PCI region reporting */
972 if ((reg0_len < C2_REG0_SIZE) ||
973 (reg2_len < C2_REG2_SIZE) || (reg4_len < C2_REG4_SIZE)) {
974 printk(KERN_ERR PFX "Invalid PCI region sizes\n");
979 /* Reserve PCI I/O and memory resources */
980 ret = pci_request_regions(pcidev, DRV_NAME);
982 printk(KERN_ERR PFX "%s: Unable to request regions\n",
987 if ((sizeof(dma_addr_t) > 4)) {
988 ret = pci_set_dma_mask(pcidev, DMA_BIT_MASK(64));
990 printk(KERN_ERR PFX "64b DMA configuration failed\n");
994 ret = pci_set_dma_mask(pcidev, DMA_BIT_MASK(32));
996 printk(KERN_ERR PFX "32b DMA configuration failed\n");
1001 /* Enables bus-mastering on the device */
1002 pci_set_master(pcidev);
1004 /* Remap the adapter PCI registers in BAR4 */
1005 mmio_regs = ioremap_nocache(reg4_start + C2_PCI_REGS_OFFSET,
1006 sizeof(struct c2_adapter_pci_regs));
1009 "Unable to remap adapter PCI registers in BAR4\n");
1014 /* Validate PCI regs magic */
1015 for (i = 0; i < sizeof(c2_magic); i++) {
1016 if (c2_magic[i] != readb(mmio_regs + C2_REGS_MAGIC + i)) {
1017 printk(KERN_ERR PFX "Downlevel Firmware boot loader "
1018 "[%d/%Zd: got 0x%x, exp 0x%x]. Use the cc_flash "
1019 "utility to update your boot loader\n",
1020 i + 1, sizeof(c2_magic),
1021 readb(mmio_regs + C2_REGS_MAGIC + i),
1023 printk(KERN_ERR PFX "Adapter not claimed\n");
1030 /* Validate the adapter version */
1031 if (be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_VERS)) != C2_VERSION) {
1032 printk(KERN_ERR PFX "Version mismatch "
1033 "[fw=%u, c2=%u], Adapter not claimed\n",
1034 be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_VERS)),
1041 /* Validate the adapter IVN */
1042 if (be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_IVN)) != C2_IVN) {
1043 printk(KERN_ERR PFX "Downlevel FIrmware level. You should be using "
1044 "the OpenIB device support kit. "
1045 "[fw=0x%x, c2=0x%x], Adapter not claimed\n",
1046 be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_IVN)),
1053 /* Allocate hardware structure */
1054 c2dev = (struct c2_dev *) ib_alloc_device(sizeof(*c2dev));
1056 printk(KERN_ERR PFX "%s: Unable to alloc hardware struct\n",
1063 memset(c2dev, 0, sizeof(*c2dev));
1064 spin_lock_init(&c2dev->lock);
1065 c2dev->pcidev = pcidev;
1068 /* Get the last RX index */
1070 (be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_HRX_CUR)) -
1071 0xffffc000) / sizeof(struct c2_rxp_desc);
1073 /* Request an interrupt line for the driver */
1074 ret = request_irq(pcidev->irq, c2_interrupt, IRQF_SHARED, DRV_NAME, c2dev);
1076 printk(KERN_ERR PFX "%s: requested IRQ %u is busy\n",
1077 pci_name(pcidev), pcidev->irq);
1082 /* Set driver specific data */
1083 pci_set_drvdata(pcidev, c2dev);
1085 /* Initialize network device */
1086 if ((netdev = c2_devinit(c2dev, mmio_regs)) == NULL) {
1091 /* Save off the actual size prior to unmapping mmio_regs */
1092 kva_map_size = be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_PCI_WINSIZE));
1094 /* Unmap the adapter PCI registers in BAR4 */
1097 /* Register network device */
1098 ret = register_netdev(netdev);
1100 printk(KERN_ERR PFX "Unable to register netdev, ret = %d\n",
1105 /* Disable network packets */
1106 netif_stop_queue(netdev);
1108 /* Remap the adapter HRXDQ PA space to kernel VA space */
1109 c2dev->mmio_rxp_ring = ioremap_nocache(reg4_start + C2_RXP_HRXDQ_OFFSET,
1111 if (!c2dev->mmio_rxp_ring) {
1112 printk(KERN_ERR PFX "Unable to remap MMIO HRXDQ region\n");
1117 /* Remap the adapter HTXDQ PA space to kernel VA space */
1118 c2dev->mmio_txp_ring = ioremap_nocache(reg4_start + C2_TXP_HTXDQ_OFFSET,
1120 if (!c2dev->mmio_txp_ring) {
1121 printk(KERN_ERR PFX "Unable to remap MMIO HTXDQ region\n");
1126 /* Save off the current RX index in the last 4 bytes of the TXP Ring */
1127 C2_SET_CUR_RX(c2dev, c2dev->cur_rx);
1129 /* Remap the PCI registers in adapter BAR0 to kernel VA space */
1130 c2dev->regs = ioremap_nocache(reg0_start, reg0_len);
1132 printk(KERN_ERR PFX "Unable to remap BAR0\n");
1137 /* Remap the PCI registers in adapter BAR4 to kernel VA space */
1138 c2dev->pa = reg4_start + C2_PCI_REGS_OFFSET;
1139 c2dev->kva = ioremap_nocache(reg4_start + C2_PCI_REGS_OFFSET,
1142 printk(KERN_ERR PFX "Unable to remap BAR4\n");
1147 /* Print out the MAC address */
1148 c2_print_macaddr(netdev);
1150 ret = c2_rnic_init(c2dev);
1152 printk(KERN_ERR PFX "c2_rnic_init failed: %d\n", ret);
1156 if (c2_register_device(c2dev))
1162 iounmap(c2dev->kva);
1165 iounmap(c2dev->regs);
1168 iounmap(c2dev->mmio_txp_ring);
1171 iounmap(c2dev->mmio_rxp_ring);
1174 unregister_netdev(netdev);
1177 free_netdev(netdev);
1180 free_irq(pcidev->irq, c2dev);
1183 ib_dealloc_device(&c2dev->ibdev);
1186 pci_release_regions(pcidev);
1189 pci_disable_device(pcidev);
1195 static void __devexit c2_remove(struct pci_dev *pcidev)
1197 struct c2_dev *c2dev = pci_get_drvdata(pcidev);
1198 struct net_device *netdev = c2dev->netdev;
1200 /* Unregister with OpenIB */
1201 c2_unregister_device(c2dev);
1203 /* Clean up the RNIC resources */
1204 c2_rnic_term(c2dev);
1206 /* Remove network device from the kernel */
1207 unregister_netdev(netdev);
1209 /* Free network device */
1210 free_netdev(netdev);
1212 /* Free the interrupt line */
1213 free_irq(pcidev->irq, c2dev);
1215 /* missing: Turn LEDs off here */
1217 /* Unmap adapter PA space */
1218 iounmap(c2dev->kva);
1219 iounmap(c2dev->regs);
1220 iounmap(c2dev->mmio_txp_ring);
1221 iounmap(c2dev->mmio_rxp_ring);
1223 /* Free the hardware structure */
1224 ib_dealloc_device(&c2dev->ibdev);
1226 /* Release reserved PCI I/O and memory resources */
1227 pci_release_regions(pcidev);
1229 /* Disable PCI device */
1230 pci_disable_device(pcidev);
1232 /* Clear driver specific data */
1233 pci_set_drvdata(pcidev, NULL);
1236 static struct pci_driver c2_pci_driver = {
1238 .id_table = c2_pci_table,
1240 .remove = __devexit_p(c2_remove),
1243 static int __init c2_init_module(void)
1245 return pci_register_driver(&c2_pci_driver);
1248 static void __exit c2_exit_module(void)
1250 pci_unregister_driver(&c2_pci_driver);
1253 module_init(c2_init_module);
1254 module_exit(c2_exit_module);