diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/block/Makefile | 1 | ||||
| -rw-r--r-- | drivers/block/lguest_blk.c | 421 | ||||
| -rw-r--r-- | drivers/char/Makefile | 1 | ||||
| -rw-r--r-- | drivers/char/hvc_lguest.c | 177 | ||||
| -rw-r--r-- | drivers/lguest/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/lguest/Makefile | 3 | ||||
| -rw-r--r-- | drivers/lguest/lguest_bus.c | 220 | ||||
| -rw-r--r-- | drivers/lguest/x86/core.c | 1 | ||||
| -rw-r--r-- | drivers/net/Makefile | 1 | ||||
| -rw-r--r-- | drivers/net/lguest_net.c | 550 |
10 files changed, 0 insertions, 1385 deletions
diff --git a/drivers/block/Makefile b/drivers/block/Makefile index d199eba7a080..7691505a2e12 100644 --- a/drivers/block/Makefile +++ b/drivers/block/Makefile @@ -32,4 +32,3 @@ obj-$(CONFIG_BLK_DEV_SX8) += sx8.o obj-$(CONFIG_BLK_DEV_UB) += ub.o obj-$(CONFIG_XEN_BLKDEV_FRONTEND) += xen-blkfront.o -obj-$(CONFIG_LGUEST_BLOCK) += lguest_blk.o diff --git a/drivers/block/lguest_blk.c b/drivers/block/lguest_blk.c deleted file mode 100644 index fa8e42341b87..000000000000 --- a/drivers/block/lguest_blk.c +++ /dev/null @@ -1,421 +0,0 @@ -/*D:400 - * The Guest block driver - * - * This is a simple block driver, which appears as /dev/lgba, lgbb, lgbc etc. - * The mechanism is simple: we place the information about the request in the - * device page, then use SEND_DMA (containing the data for a write, or an empty - * "ping" DMA for a read). - :*/ -/* Copyright 2006 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation - * - * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ -//#define DEBUG -#include <linux/init.h> -#include <linux/types.h> -#include <linux/blkdev.h> -#include <linux/interrupt.h> -#include <linux/lguest_bus.h> - -static char next_block_index = 'a'; - -/*D:420 Here is the structure which holds all the information we need about - * each Guest block device. - * - * I'm sure at this stage, you're wondering "hey, where was the adventure I was - * promised?" and thinking "Rusty sucks, I shall say nasty things about him on - * my blog". I think Real adventures have boring bits, too, and you're in the - * middle of one. But it gets better. Just not quite yet. */ -struct blockdev -{ - /* The block queue infrastructure wants a spinlock: it is held while it - * calls our block request function. We grab it in our interrupt - * handler so the responses don't mess with new requests. */ - spinlock_t lock; - - /* The disk structure registered with kernel. */ - struct gendisk *disk; - - /* The major device number for this disk, and the interrupt. We only - * really keep them here for completeness; we'd need them if we - * supported device unplugging. */ - int major; - int irq; - - /* The physical address of this device's memory page */ - unsigned long phys_addr; - /* The mapped memory page for convenient acces. */ - struct lguest_block_page *lb_page; - - /* We only have a single request outstanding at a time: this is it. */ - struct lguest_dma dma; - struct request *req; -}; - -/*D:495 We originally used end_request() throughout the driver, but it turns - * out that end_request() is deprecated, and doesn't actually end the request - * (which seems like a good reason to deprecate it!). It simply ends the first - * bio. So if we had 3 bios in a "struct request" we would do all 3, - * end_request(), do 2, end_request(), do 1 and end_request(): twice as much - * work as we needed to do. - * - * This reinforced to me that I do not understand the block layer. - * - * Nonetheless, Jens Axboe gave me this nice helper to end all chunks of a - * request. This improved disk speed by 130%. */ -static void end_entire_request(struct request *req, int uptodate) -{ - if (end_that_request_first(req, uptodate, req->hard_nr_sectors)) - BUG(); - add_disk_randomness(req->rq_disk); - blkdev_dequeue_request(req); - end_that_request_last(req, uptodate); -} - -/* I'm told there are only two stories in the world worth telling: love and - * hate. So there used to be a love scene here like this: - * - * Launcher: We could make beautiful I/O together, you and I. - * Guest: My, that's a big disk! - * - * Unfortunately, it was just too raunchy for our otherwise-gentle tale. */ - -/*D:490 This is the interrupt handler, called when a block read or write has - * been completed for us. */ -static irqreturn_t lgb_irq(int irq, void *_bd) -{ - /* We handed our "struct blockdev" as the argument to request_irq(), so - * it is passed through to us here. This tells us which device we're - * dealing with in case we have more than one. */ - struct blockdev *bd = _bd; - unsigned long flags; - - /* We weren't doing anything? Strange, but could happen if we shared - * interrupts (we don't!). */ - if (!bd->req) { - pr_debug("No work!\n"); - return IRQ_NONE; - } - - /* Not done yet? That's equally strange. */ - if (!bd->lb_page->result) { - pr_debug("No result!\n"); - return IRQ_NONE; - } - - /* We have to grab the lock before ending the request. */ - spin_lock_irqsave(&bd->lock, flags); - /* "result" is 1 for success, 2 for failure: end_entire_request() wants - * to know whether this succeeded or not. */ - end_entire_request(bd->req, bd->lb_page->result == 1); - /* Clear out request, it's done. */ - bd->req = NULL; - /* Reset incoming DMA for next time. */ - bd->dma.used_len = 0; - /* Ready for more reads or writes */ - blk_start_queue(bd->disk->queue); - spin_unlock_irqrestore(&bd->lock, flags); - - /* The interrupt was for us, we dealt with it. */ - return IRQ_HANDLED; -} - -/*D:480 The block layer's "struct request" contains a number of "struct bio"s, - * each of which contains "struct bio_vec"s, each of which contains a page, an - * offset and a length. - * - * Fortunately there are iterators to help us walk through the "struct - * request". Even more fortunately, there were plenty of places to steal the - * code from. We pack the "struct request" into our "struct lguest_dma" and - * return the total length. */ -static unsigned int req_to_dma(struct request *req, struct lguest_dma *dma) -{ - unsigned int i = 0, len = 0; - struct req_iterator iter; - struct bio_vec *bvec; - - rq_for_each_segment(bvec, req, iter) { - /* We told the block layer not to give us too many. */ - BUG_ON(i == LGUEST_MAX_DMA_SECTIONS); - /* If we had a zero-length segment, it would look like - * the end of the data referred to by the "struct - * lguest_dma", so make sure that doesn't happen. */ - BUG_ON(!bvec->bv_len); - /* Convert page & offset to a physical address */ - dma->addr[i] = page_to_phys(bvec->bv_page) - + bvec->bv_offset; - dma->len[i] = bvec->bv_len; - len += bvec->bv_len; - i++; - } - /* If the array isn't full, we mark the end with a 0 length */ - if (i < LGUEST_MAX_DMA_SECTIONS) - dma->len[i] = 0; - return len; -} - -/* This creates an empty DMA, useful for prodding the Host without sending data - * (ie. when we want to do a read) */ -static void empty_dma(struct lguest_dma *dma) -{ - dma->len[0] = 0; -} - -/*D:470 Setting up a request is fairly easy: */ -static void setup_req(struct blockdev *bd, - int type, struct request *req, struct lguest_dma *dma) -{ - /* The type is 1 (write) or 0 (read). */ - bd->lb_page->type = type; - /* The sector on disk where the read or write starts. */ - bd->lb_page->sector = req->sector; - /* The result is initialized to 0 (unfinished). */ - bd->lb_page->result = 0; - /* The current request (so we can end it in the interrupt handler). */ - bd->req = req; - /* The number of bytes: returned as a side-effect of req_to_dma(), - * which packs the block layer's "struct request" into our "struct - * lguest_dma" */ - bd->lb_page->bytes = req_to_dma(req, dma); -} - -/*D:450 Write is pretty straightforward: we pack the request into a "struct - * lguest_dma", then use SEND_DMA to send the request. */ -static void do_write(struct blockdev *bd, struct request *req) -{ - struct lguest_dma send; - - pr_debug("lgb: WRITE sector %li\n", (long)req->sector); - setup_req(bd, 1, req, &send); - - lguest_send_dma(bd->phys_addr, &send); -} - -/* Read is similar to write, except we pack the request into our receive - * "struct lguest_dma" and send through an empty DMA just to tell the Host that - * there's a request pending. */ -static void do_read(struct blockdev *bd, struct request *req) -{ - struct lguest_dma ping; - - pr_debug("lgb: READ sector %li\n", (long)req->sector); - setup_req(bd, 0, req, &bd->dma); - - empty_dma(&ping); - lguest_send_dma(bd->phys_addr, &ping); -} - -/*D:440 This where requests come in: we get handed the request queue and are - * expected to pull a "struct request" off it until we've finished them or - * we're waiting for a reply: */ -static void do_lgb_request(struct request_queue *q) -{ - struct blockdev *bd; - struct request *req; - -again: - /* This sometimes returns NULL even on the very first time around. I - * wonder if it's something to do with letting elves handle the request - * queue... */ - req = elv_next_request(q); - if (!req) - return; - - /* We attached the struct blockdev to the disk: get it back */ - bd = req->rq_disk->private_data; - /* Sometimes we get repeated requests after blk_stop_queue(), but we - * can only handle one at a time. */ - if (bd->req) - return; - - /* We only do reads and writes: no tricky business! */ - if (!blk_fs_request(req)) { - pr_debug("Got non-command 0x%08x\n", req->cmd_type); - req->errors++; - end_entire_request(req, 0); - goto again; - } - - if (rq_data_dir(req) == WRITE) - do_write(bd, req); - else - do_read(bd, req); - - /* We've put out the request, so stop any more coming in until we get - * an interrupt, which takes us to lgb_irq() to re-enable the queue. */ - blk_stop_queue(q); -} - -/*D:430 This is the "struct block_device_operations" we attach to the disk at - * the end of lguestblk_probe(). It doesn't seem to want much. */ -static struct block_device_operations lguestblk_fops = { - .owner = THIS_MODULE, -}; - -/*D:425 Setting up a disk device seems to involve a lot of code. I'm not sure - * quite why. I do know that the IDE code sent two or three of the maintainers - * insane, perhaps this is the fringe of the same disease? - * - * As in the console code, the probe function gets handed the generic - * lguest_device from lguest_bus.c: */ -static int lguestblk_probe(struct lguest_device *lgdev) -{ - struct blockdev *bd; - int err; - int irqflags = IRQF_SHARED; - - /* First we allocate our own "struct blockdev" and initialize the easy - * fields. */ - bd = kmalloc(sizeof(*bd), GFP_KERNEL); - if (!bd) - return -ENOMEM; - - spin_lock_init(&bd->lock); - bd->irq = lgdev_irq(lgdev); - bd->req = NULL; - bd->dma.used_len = 0; - bd->dma.len[0] = 0; - /* The descriptor in the lguest_devices array provided by the Host - * gives the Guest the physical page number of the device's page. */ - bd->phys_addr = (lguest_devices[lgdev->index].pfn << PAGE_SHIFT); - - /* We use lguest_map() to get a pointer to the device page */ - bd->lb_page = lguest_map(bd->phys_addr, 1); - if (!bd->lb_page) { - err = -ENOMEM; - goto out_free_bd; - } - - /* We need a major device number: 0 means "assign one dynamically". */ - bd->major = register_blkdev(0, "lguestblk"); - if (bd->major < 0) { - err = bd->major; - goto out_unmap; - } - - /* This allocates a "struct gendisk" where we pack all the information - * about the disk which the rest of Linux sees. The argument is the - * number of minor devices desired: we need one minor for the main - * disk, and one for each partition. Of course, we can't possibly know - * how many partitions are on the disk (add_disk does that). - */ - bd->disk = alloc_disk(16); - if (!bd->disk) { - err = -ENOMEM; - goto out_unregister_blkdev; - } - - /* Every disk needs a queue for requests to come in: we set up the - * queue with a callback function (the core of our driver) and the lock - * to use. */ - bd->disk->queue = blk_init_queue(do_lgb_request, &bd->lock); - if (!bd->disk->queue) { - err = -ENOMEM; - goto out_put_disk; - } - - /* We can only handle a certain number of pointers in our SEND_DMA - * call, so we set that with blk_queue_max_hw_segments(). This is not - * to be confused with blk_queue_max_phys_segments() of course! I - * know, who could possibly confuse the two? - * - * Well, it's simple to tell them apart: this one seems to work and the - * other one didn't. */ - blk_queue_max_hw_segments(bd->disk->queue, LGUEST_MAX_DMA_SECTIONS); - - /* Due to technical limitations of our Host (and simple coding) we - * can't have a single buffer which crosses a page boundary. Tell it - * here. This means that our maximum request size is 16 - * (LGUEST_MAX_DMA_SECTIONS) pages. */ - blk_queue_segment_boundary(bd->disk->queue, PAGE_SIZE-1); - - /* We name our disk: this becomes the device name when udev does its - * magic thing and creates the device node, such as /dev/lgba. - * next_block_index is a global which starts at 'a'. Unfortunately - * this simple increment logic means that the 27th disk will be called - * "/dev/lgb{". In that case, I recommend having at least 29 disks, so - * your /dev directory will be balanced. */ - sprintf(bd->disk->disk_name, "lgb%c", next_block_index++); - - /* We look to the device descriptor again to see if this device's - * interrupts are expected to be random. If they are, we tell the irq - * subsystem. At the moment this bit is always set. */ - if (lguest_devices[lgdev->index].features & LGUEST_DEVICE_F_RANDOMNESS) - irqflags |= IRQF_SAMPLE_RANDOM; - - /* Now we have the name and irqflags, we can request the interrupt; we - * give it the "struct blockdev" we have set up to pass to lgb_irq() - * when there is an interrupt. */ - err = request_irq(bd->irq, lgb_irq, irqflags, bd->disk->disk_name, bd); - if (err) - goto out_cleanup_queue; - - /* We bind our one-entry DMA pool to the key for this block device so - * the Host can reply to our requests. The key is equal to the - * physical address of the device's page, which is conveniently - * unique. */ - err = lguest_bind_dma(bd->phys_addr, &bd->dma, 1, bd->irq); - if (err) - goto out_free_irq; - - /* We finish our disk initialization and add the disk to the system. */ - bd->disk->major = bd->major; - bd->disk->first_minor = 0; - bd->disk->private_data = bd; - bd->disk->fops = &lguestblk_fops; - /* This is initialized to the disk size by the Launcher. */ - set_capacity(bd->disk, bd->lb_page->num_sectors); - add_disk(bd->disk); - - printk(KERN_INFO "%s: device %i at major %d\n", - bd->disk->disk_name, lgdev->index, bd->major); - - /* We don't need to keep the "struct blockdev" around, but if we ever - * implemented device removal, we'd need this. */ - lgdev->private = bd; - return 0; - -out_free_irq: - free_irq(bd->irq, bd); -out_cleanup_queue: - blk_cleanup_queue(bd->disk->queue); -out_put_disk: - put_disk(bd->disk); -out_unregister_blkdev: - unregister_blkdev(bd->major, "lguestblk"); -out_unmap: - lguest_unmap(bd->lb_page); -out_free_bd: - kfree(bd); - return err; -} - -/*D:410 The boilerplate code for registering the lguest block driver is just - * like the console: */ -static struct lguest_driver lguestblk_drv = { - .name = "lguestblk", - .owner = THIS_MODULE, - .device_type = LGUEST_DEVICE_T_BLOCK, - .probe = lguestblk_probe, -}; - -static __init int lguestblk_init(void) -{ - return register_lguest_driver(&lguestblk_drv); -} -module_init(lguestblk_init); - -MODULE_DESCRIPTION("Lguest block driver"); -MODULE_LICENSE("GPL"); diff --git a/drivers/char/Makefile b/drivers/char/Makefile index 057c8bbd7723..07304d50e0cb 100644 --- a/drivers/char/Makefile +++ b/drivers/char/Makefile @@ -42,7 +42,6 @@ obj-$(CONFIG_SYNCLINK_GT) += synclink_gt.o obj-$(CONFIG_N_HDLC) += n_hdlc.o obj-$(CONFIG_AMIGA_BUILTIN_SERIAL) += amiserial.o obj-$(CONFIG_SX) += sx.o generic_serial.o -obj-$(CONFIG_LGUEST_GUEST) += hvc_lguest.o obj-$(CONFIG_RIO) += rio/ generic_serial.o obj-$(CONFIG_HVC_CONSOLE) += hvc_vio.o hvsi.o obj-$(CONFIG_HVC_ISERIES) += hvc_iseries.o diff --git a/drivers/char/hvc_lguest.c b/drivers/char/hvc_lguest.c deleted file mode 100644 index efccb2155830..000000000000 --- a/drivers/char/hvc_lguest.c +++ /dev/null @@ -1,177 +0,0 @@ -/*D:300 - * The Guest console driver - * - * This is a trivial console driver: we use lguest's DMA mechanism to send - * bytes out, and register a DMA buffer to receive bytes in. It is assumed to - * be present and available from the very beginning of boot. - * - * Writing console drivers is one of the few remaining Dark Arts in Linux. - * Fortunately for us, the path of virtual consoles has been well-trodden by - * the PowerPC folks, who wrote "hvc_console.c" to generically support any - * virtual console. We use that infrastructure which only requires us to write - * the basic put_chars and get_chars functions and call the right register - * functions. - :*/ - -/*M:002 The console can be flooded: while the Guest is processing input the - * Host can send more. Buffering in the Host could alleviate this, but it is a - * difficult problem in general. :*/ -/* Copyright (C) 2006 Rusty Russell, IBM Corporation - * - * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ -#include <linux/err.h> -#include <linux/init.h> -#include <linux/lguest_bus.h> -#include <asm/paravirt.h> -#include "hvc_console.h" - -/*D:340 This is our single console input buffer, with associated "struct - * lguest_dma" referring to it. Note the 0-terminated length array, and the - * use of physical address for the buffer itself. */ -static char inbuf[256]; -static struct lguest_dma cons_input = { .used_len = 0, - .addr[0] = __pa(inbuf), - .len[0] = sizeof(inbuf), - .len[1] = 0 }; - -/*D:310 The put_chars() callback is pretty straightforward. - * - * First we put the pointer and length in a "struct lguest_dma": we only have - * one pointer, so we set the second length to 0. Then we use SEND_DMA to send - * the data to (Host) buffers attached to the console key. Usually a device's - * key is a physical address within the device's memory, but because the - * console device doesn't have any associated physical memory, we use the - * LGUEST_CONSOLE_DMA_KEY constant (aka 0). */ -static int put_chars(u32 vtermno, const char *buf, int count) -{ - struct lguest_dma dma; - - /* FIXME: DMA buffers in a "struct lguest_dma" are not allowed - * to go over page boundaries. This never seems to happen, - * but if it did we'd need to fix this code. */ - dma.len[0] = count; - dma.len[1] = 0; - dma.addr[0] = __pa(buf); - - lguest_send_dma(LGUEST_CONSOLE_DMA_KEY, &dma); - /* We're expected to return the amount of data we wrote: all of it. */ - return count; -} - -/*D:350 get_chars() is the callback from the hvc_console infrastructure when - * an interrupt is received. - * - * Firstly we see if our buffer has been filled: if not, we return. The rest - * of the code deals with the fact that the hvc_console() infrastructure only - * asks us for 16 bytes at a time. We keep a "cons_offset" variable for - * partially-read buffers. */ -static int get_chars(u32 vtermno, char *buf, int count) -{ - static int cons_offset; - - /* Nothing left to see here... */ - if (!cons_input.used_len) - return 0; - - /* You want more than we have to give? Well, try wanting less! */ - if (cons_input.used_len - cons_offset < count) - count = cons_input.used_len - cons_offset; - - /* Copy across to their buffer and increment offset. */ - memcpy(buf, inbuf + cons_offset, count); - cons_offset += count; - - /* Finished? Zero offset, and reset cons_input so Host will use it - * again. */ - if (cons_offset == cons_input.used_len) { - cons_offset = 0; - cons_input.used_len = 0; - } - return count; -} -/*:*/ - -static struct hv_ops lguest_cons = { - .get_chars = get_chars, - .put_chars = put_chars, -}; - -/*D:320 Console drivers are initialized very early so boot messages can go - * out. At this stage, the console is output-only. Our driver checks we're a - * Guest, and if so hands hvc_instantiate() the console number (0), priority - * (0), and the struct hv_ops containing the put_chars() function. */ -static int __init cons_init(void) -{ - if (strcmp(pv_info.name, "lguest") != 0) - return 0; - - return hvc_instantiate(0, 0, &lguest_cons); -} -console_initcall(cons_init); - -/*D:370 To set up and manage our virtual console, we call hvc_alloc() and - * stash the result in the private pointer of the "struct lguest_device". - * Since we never remove the console device we never need this pointer again, - * but using ->private is considered good form, and you never know who's going - * to copy your driver. - * - * Once the console is set up, we bind our input buffer ready for input. */ -static int lguestcons_probe(struct lguest_device *lgdev) -{ - int err; - - /* The first argument of hvc_alloc() is the virtual console number, so - * we use zero. The second argument is the interrupt number. - * - * The third argument is a "struct hv_ops" containing the put_chars() - * and get_chars() pointers. The final argument is the output buffer - * size: we use 256 and expect the Host to have room for us to send - * that much. */ - lgdev->private = hvc_alloc(0, lgdev_irq(lgdev), &lguest_cons, 256); - if (IS_ERR(lgdev->private)) - return PTR_ERR(lgdev->private); - - /* We bind a single DMA buffer at key LGUEST_CONSOLE_DMA_KEY. - * "cons_input" is that statically-initialized global DMA buffer we saw - * above, and we also give the interrupt we want. */ - err = lguest_bind_dma(LGUEST_CONSOLE_DMA_KEY, &cons_input, 1, - lgdev_irq(lgdev)); - if (err) - printk("lguest console: failed to bind buffer.\n"); - return err; -} -/* Note the use of lgdev_irq() for the interrupt number. We tell hvc_alloc() - * to expect input when this interrupt is triggered, and then tell - * lguest_bind_dma() that is the interrupt to send us when input comes in. */ - -/*D:360 From now on the console driver follows standard Guest driver form: - * register_lguest_driver() registers the device type and probe function, and - * the probe function sets up the device. - * - * The standard "struct lguest_driver": */ -static struct lguest_driver lguestcons_drv = { - .name = "lguestcons", - .owner = THIS_MODULE, - .device_type = LGUEST_DEVICE_T_CONSOLE, - .probe = lguestcons_probe, -}; - -/* The standard init function */ -static int __init hvc_lguest_init(void) -{ - return register_lguest_driver(&lguestcons_drv); -} -module_init(hvc_lguest_init); diff --git a/drivers/lguest/Kconfig b/drivers/lguest/Kconfig index 3ec5cc803a09..7eb9ecff8f4a 100644 --- a/drivers/lguest/Kconfig +++ b/drivers/lguest/Kconfig @@ -17,13 +17,3 @@ config LGUEST_GUEST The guest needs code built-in, even if the host has lguest support as a module. The drivers are tiny, so we build them in too. - -config LGUEST_NET - tristate - default y - depends on LGUEST_GUEST && NET - -config LGUEST_BLOCK - tristate - default y - depends on LGUEST_GUEST && BLOCK diff --git a/drivers/lguest/Makefile b/drivers/lguest/Makefile index d330f5b8c456..8c28236ee1ae 100644 --- a/drivers/lguest/Makefile +++ b/drivers/lguest/Makefile @@ -1,6 +1,3 @@ -# Guest requires the bus driver. -obj-$(CONFIG_LGUEST_GUEST) += lguest_bus.o - # Host requires the other files, which can be a module. obj-$(CONFIG_LGUEST) += lg.o lg-y = core.o hypercalls.o page_tables.o interrupts_and_traps.o \ diff --git a/drivers/lguest/lguest_bus.c b/drivers/lguest/lguest_bus.c deleted file mode 100644 index 2e9a202be44e..000000000000 --- a/drivers/lguest/lguest_bus.c +++ /dev/null @@ -1,220 +0,0 @@ -/*P:050 Lguest guests use a very simple bus for devices. It's a simple array - * of device descriptors contained just above the top of normal memory. The - * lguest bus is 80% tedious boilerplate code. :*/ -#include <linux/init.h> -#include <linux/bootmem.h> -#include <linux/lguest_bus.h> -#include <asm/io.h> -#include <asm/paravirt.h> - -struct lguest_device_desc *lguest_devices; - -static ssize_t type_show(struct device *_dev, - struct device_attribute *attr, char *buf) -{ - struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); - return sprintf(buf, "%hu", lguest_devices[dev->index].type); -} -static ssize_t features_show(struct device *_dev, - struct device_attribute *attr, char *buf) -{ - struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); - return sprintf(buf, "%hx", lguest_devices[dev->index].features); -} -static ssize_t pfn_show(struct device *_dev, - struct device_attribute *attr, char *buf) -{ - struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); - return sprintf(buf, "%u", lguest_devices[dev->index].pfn); -} -static ssize_t status_show(struct device *_dev, - struct device_attribute *attr, char *buf) -{ - struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); - return sprintf(buf, "%hx", lguest_devices[dev->index].status); -} -static ssize_t status_store(struct device *_dev, struct device_attribute *attr, - const char *buf, size_t count) -{ - struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); - if (sscanf(buf, "%hi", &lguest_devices[dev->index].status) != 1) - return -EINVAL; - return count; -} -static struct device_attribute lguest_dev_attrs[] = { - __ATTR_RO(type), - __ATTR_RO(features), - __ATTR_RO(pfn), - __ATTR(status, 0644, status_show, status_store), - __ATTR_NULL -}; - -/*D:130 The generic bus infrastructure requires a function which says whether a - * device matches a driver. For us, it is simple: "struct lguest_driver" - * contains a "device_type" field which indicates what type of device it can - * handle, so we just cast the args and compare: */ -static int lguest_dev_match(struct device *_dev, struct device_driver *_drv) -{ - struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); - struct lguest_driver *drv = container_of(_drv,struct lguest_driver,drv); - - return (drv->device_type == lguest_devices[dev->index].type); -} -/*:*/ - -struct lguest_bus { - struct bus_type bus; - struct device dev; -}; - -static struct lguest_bus lguest_bus = { - .bus = { - .name = "lguest", - .match = lguest_dev_match, - .dev_attrs = lguest_dev_attrs, - }, - .dev = { - .parent = NULL, - .bus_id = "lguest", - } -}; - -/*D:140 This is the callback which occurs once the bus infrastructure matches - * up a device and driver, ie. in response to add_lguest_device() calling - * device_register(), or register_lguest_driver() calling driver_register(). - * - * At the moment it's always the latter: the devices are added first, since - * scan_devices() is called from a "core_initcall", and the drivers themselves - * called later as a normal "initcall". But it would work the other way too. - * - * So now we have the happy couple, we add the status bit to indicate that we - * found a driver. If the driver truly loves the device, it will return - * happiness from its probe function (ok, perhaps this wasn't my greatest - * analogy), and we set the final "driver ok" bit so the Host sees it's all - * green. */ -static int lguest_dev_probe(struct device *_dev) -{ - int ret; - struct lguest_device*dev = container_of(_dev,struct lguest_device,dev); - struct lguest_driver*drv = container_of(dev->dev.driver, - struct lguest_driver, drv); - - lguest_devices[dev->index].status |= LGUEST_DEVICE_S_DRIVER; - ret = drv->probe(dev); - if (ret == 0) - lguest_devices[dev->index].status |= LGUEST_DEVICE_S_DRIVER_OK; - return ret; -} - -/* The last part of the bus infrastructure is the function lguest drivers use - * to register themselves. Firstly, we do nothing if there's no lguest bus - * (ie. this is not a Guest), otherwise we fill in the embedded generic "struct - * driver" fields and call the generic driver_register(). */ -int register_lguest_driver(struct lguest_driver *drv) -{ - if (!lguest_devices) - return 0; - - drv->drv.bus = &lguest_bus.bus; - drv->drv.name = drv->name; - drv->drv.owner = drv->owner; - drv->drv.probe = lguest_dev_probe; - - return driver_register(&drv->drv); -} - -/* At the moment we build all the drivers into the kernel because they're so - * simple: 8144 bytes for all three of them as I type this. And as the console - * really needs to be built in, it's actually only 3527 bytes for the network - * and block drivers. - * - * If they get complex it will make sense for them to be modularized, so we - * need to explicitly export the symbol. - * - * I don't think non-GPL modules make sense, so it's a GPL-only export. - */ -EXPORT_SYMBOL_GPL(register_lguest_driver); - -/*D:120 This is the core of the lguest bus: actually adding a new device. - * It's a separate function because it's neater that way, and because an - * earlier version of the code supported hotplug and unplug. They were removed - * early on because they were never used. - * - * As Andrew Tridgell says, "Untested code is buggy code". - * - * It's worth reading this carefully: we start with an index into the array of - * "struct lguest_device_desc"s indicating the device which is new: */ -static void add_lguest_device(unsigned int index) -{ - struct lguest_device *new; - - /* Each "struct lguest_device_desc" has a "status" field, which the - * Guest updates as the device is probed. In the worst case, the Host - * can look at these bits to tell what part of device setup failed, - * even if the console isn't available. */ - lguest_devices[index].status |= LGUEST_DEVICE_S_ACKNOWLEDGE; - new = kmalloc(sizeof(struct lguest_device), GFP_KERNEL); - if (!new) { - printk(KERN_EMERG "Cannot allocate lguest device %u\n", index); - lguest_devices[index].status |= LGUEST_DEVICE_S_FAILED; - return; - } - - /* The "struct lguest_device" setup is pretty straight-forward example - * code. */ - new->index = index; - new->private = NULL; - memset(&new->dev, 0, sizeof(new->dev)); - new->dev.parent = &lguest_bus.dev; - new->dev.bus = &lguest_bus.bus; - sprintf(new->dev.bus_id, "%u", index); - - /* device_register() causes the bus infrastructure to look for a - * matching driver. */ - if (device_register(&new->dev) != 0) { - printk(KERN_EMERG "Cannot register lguest device %u\n", index); - lguest_devices[index].status |= LGUEST_DEVICE_S_FAILED; - kfree(new); - } -} - -/*D:110 scan_devices() simply iterates through the device array. The type 0 - * is reserved to mean "no device", and anything else means we have found a - * device: add it. */ -static void scan_devices(void) -{ - unsigned int i; - - for (i = 0; i < LGUEST_MAX_DEVICES; i++) - if (lguest_devices[i].type) - add_lguest_device(i); -} - -/*D:100 Fairly early in boot, lguest_bus_init() is called to set up the lguest - * bus. We check that we are a Guest by checking paravirt_ops.name: there are - * other ways of checking, but this seems most obvious to me. - * - * So we can access the array of "struct lguest_device_desc"s easily, we map - * that memory and store the pointer in the global "lguest_devices". Then we - * register the bus with the core. Doing two registrations seems clunky to me, - * but it seems to be the correct sysfs incantation. - * - * Finally we call scan_devices() which adds all the devices found in the - * "struct lguest_device_desc" array. */ -static int __init lguest_bus_init(void) -{ - if (strcmp(pv_info.name, "lguest") != 0) - return 0; - - /* Devices are in a single page above top of "normal" mem */ - lguest_devices = lguest_map(max_pfn<<PAGE_SHIFT, 1); - - if (bus_register(&lguest_bus.bus) != 0 - || device_register(&lguest_bus.dev) != 0) - panic("lguest bus registration failed"); - - scan_devices(); - return 0; -} -/* Do this after core stuff, before devices. */ -postcore_initcall(lguest_bus_init); diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c index 39f64c95de18..ef976ccb4192 100644 --- a/drivers/lguest/x86/core.c +++ b/drivers/lguest/x86/core.c @@ -29,7 +29,6 @@ #include <linux/cpu.h> #include <linux/lguest.h> #include <linux/lguest_launcher.h> -#include <linux/lguest_bus.h> #include <asm/paravirt.h> #include <asm/param.h> #include <asm/page.h> diff --git a/drivers/net/Makefile b/drivers/net/Makefile index 6745feb690ff..593262065c9b 100644 --- a/drivers/net/Makefile +++ b/drivers/net/Makefile @@ -183,7 +183,6 @@ obj-$(CONFIG_ZORRO8390) += zorro8390.o obj-$(CONFIG_HPLANCE) += hplance.o 7990.o obj-$(CONFIG_MVME147_NET) += mvme147.o 7990.o obj-$(CONFIG_EQUALIZER) += eql.o -obj-$(CONFIG_LGUEST_NET) += lguest_net.o obj-$(CONFIG_MIPS_JAZZ_SONIC) += jazzsonic.o obj-$(CONFIG_MIPS_AU1X00_ENET) += au1000_eth.o obj-$(CONFIG_MIPS_SIM_NET) += mipsnet.o diff --git a/drivers/net/lguest_net.c b/drivers/net/lguest_net.c deleted file mode 100644 index e255476f224f..000000000000 --- a/drivers/net/lguest_net.c +++ /dev/null @@ -1,550 +0,0 @@ -/*D:500 - * The Guest network driver. - * - * This is very simple a virtual network driver, and our last Guest driver. - * The only trick is that it can talk directly to multiple other recipients - * (ie. other Guests on the same network). It can also be used with only the - * Host on the network. - :*/ - -/* Copyright 2006 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation - * - * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ -//#define DEBUG -#include <linux/netdevice.h> -#include <linux/etherdevice.h> -#include <linux/module.h> -#include <linux/mm_types.h> -#include <linux/io.h> -#include <linux/lguest_bus.h> - -#define SHARED_SIZE PAGE_SIZE -#define MAX_LANS 4 -#define NUM_SKBS 8 - -/*M:011 Network code master Jeff Garzik points out numerous shortcomings in - * this driver if it aspires to greatness. - * - * Firstly, it doesn't use "NAPI": the networking's New API, and is poorer for - * it. As he says "NAPI means system-wide load leveling, across multiple - * network interfaces. Lack of NAPI can mean competition at higher loads." - * - * He also points out that we don't implement set_mac_address, so users cannot - * change the devices hardware address. When I asked why one would want to: - * "Bonding, and situations where you /do/ want the MAC address to "leak" out - * of the host onto the wider net." - * - * Finally, he would like module unloading: "It is not unrealistic to think of - * [un|re|]loading the net support module in an lguest guest. And, adding - * module support makes the programmer more responsible, because they now have - * to learn to clean up after themselves. Any driver that cannot clean up - * after itself is an incomplete driver in my book." - :*/ - -/*D:530 The "struct lguestnet_info" contains all the information we need to - * know about the network device. */ -struct lguestnet_info -{ - /* The mapped device page(s) (an array of "struct lguest_net"). */ - struct lguest_net *peer; - /* The physical address of the device page(s) */ - unsigned long peer_phys; - /* The size of the device page(s). */ - unsigned long mapsize; - - /* The lguest_device I come from */ - struct lguest_device *lgdev; - - /* My peerid (ie. my slot in the array). */ - unsigned int me; - - /* Receive queue: the network packets waiting to be filled. */ - struct sk_buff *skb[NUM_SKBS]; - struct lguest_dma dma[NUM_SKBS]; -}; -/*:*/ - -/* How many bytes left in this page. */ -static unsigned int rest_of_page(void *data) -{ - return PAGE_SIZE - ((unsigned long)data % PAGE_SIZE); -} - -/*D:570 Each peer (ie. Guest or Host) on the network binds their receive - * buffers to a different key: we simply use the physical address of the - * device's memory page plus the peer number. The Host insists that all keys - * be a multiple of 4, so we multiply the peer number by 4. */ -static unsigned long peer_key(struct lguestnet_info *info, unsigned peernum) -{ - return info->peer_phys + 4 * peernum; -} - -/* This is the routine which sets up a "struct lguest_dma" to point to a - * network packet, similar to req_to_dma() in lguest_blk.c. The structure of a - * "struct sk_buff" has grown complex over the years: it consists of a "head" - * linear section pointed to by "skb->data", and possibly an array of - * "fragments" in the case of a non-linear packet. - * - * Our receive buffers don't use fragments at all but outgoing skbs might, so - * we handle it. */ -static void skb_to_dma(const struct sk_buff *skb, unsigned int headlen, - struct lguest_dma *dma) -{ - unsigned int i, seg; - - /* First, we put the linear region into the "struct lguest_dma". Each - * entry can't go over a page boundary, so even though all our packets - * are 1514 bytes or less, we might need to use two entries here: */ - for (i = seg = 0; i < headlen; seg++, i += rest_of_page(skb->data+i)) { - dma->addr[seg] = virt_to_phys(skb->data + i); - dma->len[seg] = min((unsigned)(headlen - i), - rest_of_page(skb->data + i)); - } - - /* Now we handle the fragments: at least they're guaranteed not to go - * over a page. skb_shinfo(skb) returns a pointer to the structure - * which tells us about the number of fragments and the fragment - * array. */ - for (i = 0; i < skb_shinfo(skb)->nr_frags; i++, seg++) { - const skb_frag_t *f = &skb_shinfo(skb)->frags[i]; - /* Should not happen with MTU less than 64k - 2 * PAGE_SIZE. */ - if (seg == LGUEST_MAX_DMA_SECTIONS) { - /* We will end up sending a truncated packet should - * this ever happen. Plus, a cool log message! */ - printk("Woah dude! Megapacket!\n"); - break; - } - dma->addr[seg] = page_to_phys(f->page) + f->page_offset; - dma->len[seg] = f->size; - } - - /* If after all that we didn't use the entire "struct lguest_dma" - * array, we terminate it with a 0 length. */ - if (seg < LGUEST_MAX_DMA_SECTIONS) - dma->len[seg] = 0; -} - -/* - * Packet transmission. - * - * Our packet transmission is a little unusual. A real network card would just - * send out the packet and leave the receivers to decide if they're interested. - * Instead, we look through the network device memory page and see if any of - * the ethernet addresses match the packet destination, and if so we send it to - * that Guest. - * - * This is made a little more complicated in two cases. The first case is - * broadcast packets: for that we send the packet to all Guests on the network, - * one at a time. The second case is "promiscuous" mode, where a Guest wants - * to see all the packets on the network. We need a way for the Guest to tell - * us it wants to see all packets, so it sets the "multicast" bit on its - * published MAC address, which is never valid in a real ethernet address. - */ -#define PROMISC_BIT 0x01 - -/* This is the callback which is summoned whenever the network device's - * multicast or promiscuous state changes. If the card is in promiscuous mode, - * we advertise that in our ethernet address in the device's memory. We do the - * same if Linux wants any or all multicast traffic. */ -static void lguestnet_set_multicast(struct net_device *dev) -{ - struct lguestnet_info *info = netdev_priv(dev); - - if ((dev->flags & (IFF_PROMISC|IFF_ALLMULTI)) || dev->mc_count) - info->peer[info->me].mac[0] |= PROMISC_BIT; - else - info->peer[info->me].mac[0] &= ~PROMISC_BIT; -} - -/* A simple test function to see if a peer wants to see all packets.*/ -static int promisc(struct lguestnet_info *info, unsigned int peer) -{ - return info->peer[peer].mac[0] & PROMISC_BIT; -} - -/* Another simple function to see if a peer's advertised ethernet address - * matches a packet's destination ethernet address. */ -static int mac_eq(const unsigned char mac[ETH_ALEN], - struct lguestnet_info *info, unsigned int peer) -{ - /* Ignore multicast bit, which peer turns on to mean promisc. */ - if ((info->peer[peer].mac[0] & (~PROMISC_BIT)) != mac[0]) - return 0; - return memcmp(mac+1, info->peer[peer].mac+1, ETH_ALEN-1) == 0; -} - -/* This is the function which actually sends a packet once we've decided a - * peer wants it: */ -static void transfer_packet(struct net_device *dev, - struct sk_buff *skb, - unsigned int peernum) -{ - struct lguestnet_info *info = netdev_priv(dev); - struct lguest_dma dma; - - /* We use our handy "struct lguest_dma" packing function to prepare - * the skb for sending. */ - skb_to_dma(skb, skb_headlen(skb), &dma); - pr_debug("xfer length %04x (%u)\n", htons(skb->len), skb->len); - - /* This is the actual send call which copies the packet. */ - lguest_send_dma(peer_key(info, peernum), &dma); - - /* Check that the entire packet was transmitted. If not, it could mean - * that the other Guest registered a short receive buffer, but this - * driver should never do that. More likely, the peer is dead. */ - if (dma.used_len != skb->len) { - dev->stats.tx_carrier_errors++; - pr_debug("Bad xfer to peer %i: %i of %i (dma %p/%i)\n", - peernum, dma.used_len, skb->len, - (void *)dma.addr[0], dma.len[0]); - } else { - /* On success we update the stats. */ - dev->stats.tx_bytes += skb->len; - dev->stats.tx_packets++; - } -} - -/* Another helper function to tell is if a slot in the device memory is unused. - * Since we always set the Local Assignment bit in the ethernet address, the - * first byte can never be 0. */ -static int unused_peer(const struct lguest_net peer[], unsigned int num) -{ - return peer[num].mac[0] == 0; -} - -/* Finally, here is the routine which handles an outgoing packet. It's called - * "start_xmit" for traditional reasons. */ -static int lguestnet_start_xmit(struct sk_buff *skb, struct net_device *dev) -{ - unsigned int i; - int broadcast; - struct lguestnet_info *info = netdev_priv(dev); - /* Extract the destination ethernet address from the packet. */ - const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; - DECLARE_MAC_BUF(mac); - - pr_debug("%s: xmit %s\n", dev->name, print_mac(mac, dest)); - - /* If it's a multicast packet, we broadcast to everyone. That's not - * very efficient, but there are very few applications which actually - * use multicast, which is a shame really. - * - * As etherdevice.h points out: "By definition the broadcast address is - * also a multicast address." So we don't have to test for broadcast - * packets separately. */ - broadcast = is_multicast_ether_addr(dest); - - /* Look through all the published ethernet addresses to see if we - * should send this packet. */ - for (i = 0; i < info->mapsize/sizeof(struct lguest_net); i++) { - /* We don't send to ourselves (we actually can't SEND_DMA to - * ourselves anyway), and don't send to unused slots.*/ - if (i == info->me || unused_peer(info->peer, i)) - continue; - - /* If it's broadcast we send it. If they want every packet we - * send it. If the destination matches their address we send - * it. Otherwise we go to the next peer. */ - if (!broadcast && !promisc(info, i) && !mac_eq(dest, info, i)) - continue; - - pr_debug("lguestnet %s: sending from %i to %i\n", - dev->name, info->me, i); - /* Our routine which actually does the transfer. */ - transfer_packet(dev, skb, i); - } - - /* An xmit routine is expected to dispose of the packet, so we do. */ - dev_kfree_skb(skb); - - /* As per kernel convention, 0 means success. This is why I love - * networking: even if we never sent to anyone, that's still - * success! */ - return 0; -} - -/*D:560 - * Packet receiving. - * - * First, here's a helper routine which fills one of our array of receive - * buffers: */ -static int fill_slot(struct net_device *dev, unsigned int slot) -{ - struct lguestnet_info *info = netdev_priv(dev); - - /* We can receive ETH_DATA_LEN (1500) byte packets, plus a standard - * ethernet header of ETH_HLEN (14) bytes. */ - info->skb[slot] = netdev_alloc_skb(dev, ETH_HLEN + ETH_DATA_LEN); - if (!info->skb[slot]) { - printk("%s: could not fill slot %i\n", dev->name, slot); - return -ENOMEM; - } - - /* skb_to_dma() is a helper which sets up the "struct lguest_dma" to - * point to the data in the skb: we also use it for sending out a - * packet. */ - skb_to_dma(info->skb[slot], ETH_HLEN + ETH_DATA_LEN, &info->dma[slot]); - - /* This is a Write Memory Barrier: it ensures that the entry in the - * receive buffer array is written *before* we set the "used_len" entry - * to 0. If the Host were looking at the receive buffer array from a - * different CPU, it could potentially see "used_len = 0" and not see - * the updated receive buffer information. This would be a horribly - * nasty bug, so make sure the compiler and CPU know this has to happen - * first. */ - wmb(); - /* Writing 0 to "used_len" tells the Host it can use this receive - * buffer now. */ - info->dma[slot].used_len = 0; - return 0; -} - -/* This is the actual receive routine. When we receive an interrupt from the - * Host to tell us a packet has been delivered, we arrive here: */ -static irqreturn_t lguestnet_rcv(int irq, void *dev_id) -{ - struct net_device *dev = dev_id; - struct lguestnet_info *info = netdev_priv(dev); - unsigned int i, done = 0; - - /* Look through our entire receive array for an entry which has data - * in it. */ - for (i = 0; i < ARRAY_SIZE(info->dma); i++) { - unsigned int length; - struct sk_buff *skb; - - length = info->dma[i].used_len; - if (length == 0) - continue; - - /* We've found one! Remember the skb (we grabbed the length - * above), and immediately refill the slot we've taken it - * from. */ - done++; - skb = info->skb[i]; - fill_slot(dev, i); - - /* This shouldn't happen: micropackets could be sent by a - * badly-behaved Guest on the network, but the Host will never - * stuff more data in the buffer than the buffer length. */ - if (length < ETH_HLEN || length > ETH_HLEN + ETH_DATA_LEN) { - pr_debug(KERN_WARNING "%s: unbelievable skb len: %i\n", - dev->name, length); - dev_kfree_skb(skb); - continue; - } - - /* skb_put(), what a great function! I've ranted about this - * function before (http://lkml.org/lkml/1999/9/26/24). You - * call it after you've added data to the end of an skb (in - * this case, it was the Host which wrote the data). */ - skb_put(skb, length); - - /* The ethernet header contains a protocol field: we use the - * standard helper to extract it, and place the result in - * skb->protocol. The helper also sets up skb->pkt_type and - * eats up the ethernet header from the front of the packet. */ - skb->protocol = eth_type_trans(skb, dev); - - /* If this device doesn't need checksums for sending, we also - * don't need to check the packets when they come in. */ - if (dev->features & NETIF_F_NO_CSUM) - skb->ip_summed = CHECKSUM_UNNECESSARY; - - /* As a last resort for debugging the driver or the lguest I/O - * subsystem, you can uncomment the "#define DEBUG" at the top - * of this file, which turns all the pr_debug() into printk() - * and floods the logs. */ - pr_debug("Receiving skb proto 0x%04x len %i type %i\n", - ntohs(skb->protocol), skb->len, skb->pkt_type); - - /* Update the packet and byte counts (visible from ifconfig, - * and good for debugging). */ - dev->stats.rx_bytes += skb->len; - dev->stats.rx_packets++; - - /* Hand our fresh network packet into the stack's "network - * interface receive" routine. That will free the packet - * itself when it's finished. */ - netif_rx(skb); - } - - /* If we found any packets, we assume the interrupt was for us. */ - return done ? IRQ_HANDLED : IRQ_NONE; -} - -/*D:550 This is where we start: when the device is brought up by dhcpd or - * ifconfig. At this point we advertise our MAC address to the rest of the - * network, and register receive buffers ready for incoming packets. */ -static int lguestnet_open(struct net_device *dev) -{ - int i; - struct lguestnet_info *info = netdev_priv(dev); - - /* Copy our MAC address into the device page, so others on the network - * can find us. */ - memcpy(info->peer[info->me].mac, dev->dev_addr, ETH_ALEN); - - /* We might already be in promisc mode (dev->flags & IFF_PROMISC). Our - * set_multicast callback handles this already, so we call it now. */ - lguestnet_set_multicast(dev); - - /* Allocate packets and put them into our "struct lguest_dma" array. - * If we fail to allocate all the packets we could still limp along, - * but it's a sign of real stress so we should probably give up now. */ - for (i = 0; i < ARRAY_SIZE(info->dma); i++) { - if (fill_slot(dev, i) != 0) - goto cleanup; - } - - /* Finally we tell the Host where our array of "struct lguest_dma" - * receive buffers is, binding it to the key corresponding to the - * device's physical memory plus our peerid. */ - if (lguest_bind_dma(peer_key(info,info->me), info->dma, - NUM_SKBS, lgdev_irq(info->lgdev)) != 0) - goto cleanup; - return 0; - -cleanup: - while (--i >= 0) - dev_kfree_skb(info->skb[i]); - return -ENOMEM; -} -/*:*/ - -/* The close routine is called when the device is no longer in use: we clean up - * elegantly. */ -static int lguestnet_close(struct net_device *dev) -{ - unsigned int i; - struct lguestnet_info *info = netdev_priv(dev); - - /* Clear all trace of our existence out of the device memory by setting - * the slot which held our MAC address to 0 (unused). */ - memset(&info->peer[info->me], 0, sizeof(info->peer[info->me])); - - /* Unregister our array of receive buffers */ - lguest_unbind_dma(peer_key(info, info->me), info->dma); - for (i = 0; i < ARRAY_SIZE(info->dma); i++) - dev_kfree_skb(info->skb[i]); - return 0; -} - -/*D:510 The network device probe function is basically a standard ethernet - * device setup. It reads the "struct lguest_device_desc" and sets the "struct - * net_device". Oh, the line-by-line excitement! Let's skip over it. :*/ -static int lguestnet_probe(struct lguest_device *lgdev) -{ - int err, irqf = IRQF_SHARED; - struct net_device *dev; - struct lguestnet_info *info; - struct lguest_device_desc *desc = &lguest_devices[lgdev->index]; - - pr_debug("lguest_net: probing for device %i\n", lgdev->index); - - dev = alloc_etherdev(sizeof(struct lguestnet_info)); - if (!dev) - return -ENOMEM; - - /* Ethernet defaults with some changes */ - ether_setup(dev); - dev->set_mac_address = NULL; - random_ether_addr(dev->dev_addr); - - dev->open = lguestnet_open; - dev->stop = lguestnet_close; - dev->hard_start_xmit = lguestnet_start_xmit; - - /* We don't actually support multicast yet, but turning on/off - * promisc also calls dev->set_multicast_list. */ - dev->set_multicast_list = lguestnet_set_multicast; - SET_NETDEV_DEV(dev, &lgdev->dev); - - /* The network code complains if you have "scatter-gather" capability - * if you don't also handle checksums (it seem that would be - * "illogical"). So we use a lie of omission and don't tell it that we - * can handle scattered packets unless we also don't want checksums, - * even though to us they're completely independent. */ - if (desc->features & LGUEST_NET_F_NOCSUM) - dev->features = NETIF_F_SG|NETIF_F_NO_CSUM; - - info = netdev_priv(dev); - info->mapsize = PAGE_SIZE * desc->num_pages; - info->peer_phys = ((unsigned long)desc->pfn << PAGE_SHIFT); - info->lgdev = lgdev; - info->peer = lguest_map(info->peer_phys, desc->num_pages); - if (!info->peer) { - err = -ENOMEM; - goto free; - } - - /* This stores our peerid (upper bits reserved for future). */ - info->me = (desc->features & (info->mapsize-1)); - - err = register_netdev(dev); - if (err) { - pr_debug("lguestnet: registering device failed\n"); - goto unmap; - } - - if (lguest_devices[lgdev->index].features & LGUEST_DEVICE_F_RANDOMNESS) - irqf |= IRQF_SAMPLE_RANDOM; - if (request_irq(lgdev_irq(lgdev), lguestnet_rcv, irqf, "lguestnet", - dev) != 0) { - pr_debug("lguestnet: cannot get irq %i\n", lgdev_irq(lgdev)); - goto unregister; - } - - pr_debug("lguestnet: registered device %s\n", dev->name); - /* Finally, we put the "struct net_device" in the generic "struct - * lguest_device"s private pointer. Again, it's not necessary, but - * makes sure the cool kernel kids don't tease us. */ - lgdev->private = dev; - return 0; - -unregister: - unregister_netdev(dev); -unmap: - lguest_unmap(info->peer); -free: - free_netdev(dev); - return err; -} - -static struct lguest_driver lguestnet_drv = { - .name = "lguestnet", - .owner = THIS_MODULE, - .device_type = LGUEST_DEVICE_T_NET, - .probe = lguestnet_probe, -}; - -static __init int lguestnet_init(void) -{ - return register_lguest_driver(&lguestnet_drv); -} -module_init(lguestnet_init); - -MODULE_DESCRIPTION("Lguest network driver"); -MODULE_LICENSE("GPL"); - -/*D:580 - * This is the last of the Drivers, and with this we have covered the many and - * wonderous and fine (and boring) details of the Guest. - * - * "make Launcher" beckons, where we answer questions like "Where do Guests - * come from?", and "What do you do when someone asks for optimization?" - */ |
