![Eric Dumazet](/assets/img/avatar_default.png)
Some network drivers use a non default hard_header_len Transmitted skb should take into account dev->hard_header_len, or risk crashes or expensive reallocations. In the case of aoe, lets reserve MAX_HEADER bytes. David reported a crash in defxx driver, solved by this patch. Reported-by: David Oostdyk <daveo@ll.mit.edu> Tested-by: David Oostdyk <daveo@ll.mit.edu> Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Ed Cashin <ecashin@coraid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1769 lines
35 KiB
C
1769 lines
35 KiB
C
/* Copyright (c) 2012 Coraid, Inc. See COPYING for GPL terms. */
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/*
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* aoecmd.c
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* Filesystem request handling methods
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*/
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#include <linux/ata.h>
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#include <linux/slab.h>
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#include <linux/hdreg.h>
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#include <linux/blkdev.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/genhd.h>
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#include <linux/moduleparam.h>
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#include <linux/workqueue.h>
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#include <linux/kthread.h>
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#include <net/net_namespace.h>
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#include <asm/unaligned.h>
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#include <linux/uio.h>
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#include "aoe.h"
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#define MAXIOC (8192) /* default meant to avoid most soft lockups */
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static void ktcomplete(struct frame *, struct sk_buff *);
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static int count_targets(struct aoedev *d, int *untainted);
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static struct buf *nextbuf(struct aoedev *);
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static int aoe_deadsecs = 60 * 3;
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module_param(aoe_deadsecs, int, 0644);
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MODULE_PARM_DESC(aoe_deadsecs, "After aoe_deadsecs seconds, give up and fail dev.");
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static int aoe_maxout = 64;
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module_param(aoe_maxout, int, 0644);
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MODULE_PARM_DESC(aoe_maxout,
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"Only aoe_maxout outstanding packets for every MAC on eX.Y.");
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static wait_queue_head_t ktiowq;
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static struct ktstate kts;
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/* io completion queue */
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static struct {
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struct list_head head;
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spinlock_t lock;
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} iocq;
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static struct page *empty_page;
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static struct sk_buff *
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new_skb(ulong len)
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{
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struct sk_buff *skb;
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skb = alloc_skb(len + MAX_HEADER, GFP_ATOMIC);
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if (skb) {
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skb_reserve(skb, MAX_HEADER);
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skb_reset_mac_header(skb);
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skb_reset_network_header(skb);
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skb->protocol = __constant_htons(ETH_P_AOE);
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skb_checksum_none_assert(skb);
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}
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return skb;
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}
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static struct frame *
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getframe_deferred(struct aoedev *d, u32 tag)
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{
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struct list_head *head, *pos, *nx;
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struct frame *f;
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head = &d->rexmitq;
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list_for_each_safe(pos, nx, head) {
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f = list_entry(pos, struct frame, head);
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if (f->tag == tag) {
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list_del(pos);
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return f;
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}
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}
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return NULL;
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}
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static struct frame *
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getframe(struct aoedev *d, u32 tag)
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{
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struct frame *f;
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struct list_head *head, *pos, *nx;
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u32 n;
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n = tag % NFACTIVE;
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head = &d->factive[n];
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list_for_each_safe(pos, nx, head) {
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f = list_entry(pos, struct frame, head);
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if (f->tag == tag) {
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list_del(pos);
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return f;
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}
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}
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return NULL;
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}
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/*
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* Leave the top bit clear so we have tagspace for userland.
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* The bottom 16 bits are the xmit tick for rexmit/rttavg processing.
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* This driver reserves tag -1 to mean "unused frame."
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*/
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static int
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newtag(struct aoedev *d)
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{
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register ulong n;
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n = jiffies & 0xffff;
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return n |= (++d->lasttag & 0x7fff) << 16;
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}
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static u32
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aoehdr_atainit(struct aoedev *d, struct aoetgt *t, struct aoe_hdr *h)
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{
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u32 host_tag = newtag(d);
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memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src);
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memcpy(h->dst, t->addr, sizeof h->dst);
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h->type = __constant_cpu_to_be16(ETH_P_AOE);
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h->verfl = AOE_HVER;
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h->major = cpu_to_be16(d->aoemajor);
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h->minor = d->aoeminor;
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h->cmd = AOECMD_ATA;
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h->tag = cpu_to_be32(host_tag);
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return host_tag;
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}
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static inline void
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put_lba(struct aoe_atahdr *ah, sector_t lba)
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{
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ah->lba0 = lba;
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ah->lba1 = lba >>= 8;
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ah->lba2 = lba >>= 8;
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ah->lba3 = lba >>= 8;
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ah->lba4 = lba >>= 8;
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ah->lba5 = lba >>= 8;
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}
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static struct aoeif *
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ifrotate(struct aoetgt *t)
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{
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struct aoeif *ifp;
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ifp = t->ifp;
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ifp++;
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if (ifp >= &t->ifs[NAOEIFS] || ifp->nd == NULL)
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ifp = t->ifs;
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if (ifp->nd == NULL)
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return NULL;
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return t->ifp = ifp;
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}
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static void
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skb_pool_put(struct aoedev *d, struct sk_buff *skb)
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{
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__skb_queue_tail(&d->skbpool, skb);
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}
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static struct sk_buff *
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skb_pool_get(struct aoedev *d)
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{
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struct sk_buff *skb = skb_peek(&d->skbpool);
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if (skb && atomic_read(&skb_shinfo(skb)->dataref) == 1) {
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__skb_unlink(skb, &d->skbpool);
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return skb;
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}
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if (skb_queue_len(&d->skbpool) < NSKBPOOLMAX &&
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(skb = new_skb(ETH_ZLEN)))
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return skb;
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return NULL;
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}
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void
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aoe_freetframe(struct frame *f)
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{
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struct aoetgt *t;
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t = f->t;
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f->buf = NULL;
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f->lba = 0;
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f->bv = NULL;
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f->r_skb = NULL;
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f->flags = 0;
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list_add(&f->head, &t->ffree);
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}
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static struct frame *
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newtframe(struct aoedev *d, struct aoetgt *t)
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{
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struct frame *f;
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struct sk_buff *skb;
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struct list_head *pos;
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if (list_empty(&t->ffree)) {
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if (t->falloc >= NSKBPOOLMAX*2)
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return NULL;
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f = kcalloc(1, sizeof(*f), GFP_ATOMIC);
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if (f == NULL)
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return NULL;
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t->falloc++;
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f->t = t;
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} else {
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pos = t->ffree.next;
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list_del(pos);
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f = list_entry(pos, struct frame, head);
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}
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skb = f->skb;
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if (skb == NULL) {
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f->skb = skb = new_skb(ETH_ZLEN);
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if (!skb) {
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bail: aoe_freetframe(f);
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return NULL;
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}
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}
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if (atomic_read(&skb_shinfo(skb)->dataref) != 1) {
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skb = skb_pool_get(d);
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if (skb == NULL)
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goto bail;
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skb_pool_put(d, f->skb);
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f->skb = skb;
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}
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skb->truesize -= skb->data_len;
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skb_shinfo(skb)->nr_frags = skb->data_len = 0;
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skb_trim(skb, 0);
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return f;
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}
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static struct frame *
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newframe(struct aoedev *d)
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{
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struct frame *f;
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struct aoetgt *t, **tt;
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int totout = 0;
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int use_tainted;
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int has_untainted;
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if (!d->targets || !d->targets[0]) {
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printk(KERN_ERR "aoe: NULL TARGETS!\n");
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return NULL;
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}
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tt = d->tgt; /* last used target */
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for (use_tainted = 0, has_untainted = 0;;) {
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tt++;
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if (tt >= &d->targets[d->ntargets] || !*tt)
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tt = d->targets;
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t = *tt;
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if (!t->taint) {
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has_untainted = 1;
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totout += t->nout;
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}
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if (t->nout < t->maxout
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&& (use_tainted || !t->taint)
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&& t->ifp->nd) {
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f = newtframe(d, t);
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if (f) {
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ifrotate(t);
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d->tgt = tt;
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return f;
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}
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}
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if (tt == d->tgt) { /* we've looped and found nada */
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if (!use_tainted && !has_untainted)
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use_tainted = 1;
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else
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break;
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}
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}
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if (totout == 0) {
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d->kicked++;
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d->flags |= DEVFL_KICKME;
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}
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return NULL;
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}
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static void
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skb_fillup(struct sk_buff *skb, struct bio_vec *bv, ulong off, ulong cnt)
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{
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int frag = 0;
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ulong fcnt;
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loop:
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fcnt = bv->bv_len - (off - bv->bv_offset);
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if (fcnt > cnt)
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fcnt = cnt;
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skb_fill_page_desc(skb, frag++, bv->bv_page, off, fcnt);
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cnt -= fcnt;
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if (cnt <= 0)
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return;
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bv++;
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off = bv->bv_offset;
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goto loop;
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}
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static void
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fhash(struct frame *f)
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{
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struct aoedev *d = f->t->d;
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u32 n;
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n = f->tag % NFACTIVE;
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list_add_tail(&f->head, &d->factive[n]);
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}
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static void
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ata_rw_frameinit(struct frame *f)
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{
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struct aoetgt *t;
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struct aoe_hdr *h;
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struct aoe_atahdr *ah;
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struct sk_buff *skb;
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char writebit, extbit;
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skb = f->skb;
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h = (struct aoe_hdr *) skb_mac_header(skb);
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ah = (struct aoe_atahdr *) (h + 1);
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skb_put(skb, sizeof(*h) + sizeof(*ah));
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memset(h, 0, skb->len);
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writebit = 0x10;
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extbit = 0x4;
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t = f->t;
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f->tag = aoehdr_atainit(t->d, t, h);
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fhash(f);
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t->nout++;
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f->waited = 0;
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f->waited_total = 0;
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if (f->buf)
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f->lba = f->buf->sector;
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/* set up ata header */
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ah->scnt = f->bcnt >> 9;
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put_lba(ah, f->lba);
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if (t->d->flags & DEVFL_EXT) {
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ah->aflags |= AOEAFL_EXT;
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} else {
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extbit = 0;
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ah->lba3 &= 0x0f;
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ah->lba3 |= 0xe0; /* LBA bit + obsolete 0xa0 */
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}
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if (f->buf && bio_data_dir(f->buf->bio) == WRITE) {
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skb_fillup(skb, f->bv, f->bv_off, f->bcnt);
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ah->aflags |= AOEAFL_WRITE;
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skb->len += f->bcnt;
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skb->data_len = f->bcnt;
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skb->truesize += f->bcnt;
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t->wpkts++;
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} else {
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t->rpkts++;
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writebit = 0;
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}
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ah->cmdstat = ATA_CMD_PIO_READ | writebit | extbit;
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skb->dev = t->ifp->nd;
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}
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static int
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aoecmd_ata_rw(struct aoedev *d)
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{
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struct frame *f;
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struct buf *buf;
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struct aoetgt *t;
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struct sk_buff *skb;
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struct sk_buff_head queue;
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ulong bcnt, fbcnt;
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buf = nextbuf(d);
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if (buf == NULL)
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return 0;
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f = newframe(d);
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if (f == NULL)
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return 0;
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t = *d->tgt;
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bcnt = d->maxbcnt;
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if (bcnt == 0)
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bcnt = DEFAULTBCNT;
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if (bcnt > buf->resid)
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bcnt = buf->resid;
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fbcnt = bcnt;
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f->bv = buf->bv;
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f->bv_off = f->bv->bv_offset + (f->bv->bv_len - buf->bv_resid);
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do {
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if (fbcnt < buf->bv_resid) {
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buf->bv_resid -= fbcnt;
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buf->resid -= fbcnt;
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break;
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}
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fbcnt -= buf->bv_resid;
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buf->resid -= buf->bv_resid;
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if (buf->resid == 0) {
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d->ip.buf = NULL;
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break;
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}
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buf->bv++;
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buf->bv_resid = buf->bv->bv_len;
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WARN_ON(buf->bv_resid == 0);
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} while (fbcnt);
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/* initialize the headers & frame */
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f->buf = buf;
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f->bcnt = bcnt;
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ata_rw_frameinit(f);
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/* mark all tracking fields and load out */
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buf->nframesout += 1;
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buf->sector += bcnt >> 9;
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skb = skb_clone(f->skb, GFP_ATOMIC);
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if (skb) {
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do_gettimeofday(&f->sent);
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f->sent_jiffs = (u32) jiffies;
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__skb_queue_head_init(&queue);
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__skb_queue_tail(&queue, skb);
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aoenet_xmit(&queue);
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}
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return 1;
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}
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/* some callers cannot sleep, and they can call this function,
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* transmitting the packets later, when interrupts are on
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*/
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static void
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aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff_head *queue)
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{
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struct aoe_hdr *h;
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struct aoe_cfghdr *ch;
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struct sk_buff *skb;
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struct net_device *ifp;
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rcu_read_lock();
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for_each_netdev_rcu(&init_net, ifp) {
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dev_hold(ifp);
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if (!is_aoe_netif(ifp))
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goto cont;
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skb = new_skb(sizeof *h + sizeof *ch);
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if (skb == NULL) {
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printk(KERN_INFO "aoe: skb alloc failure\n");
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goto cont;
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}
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skb_put(skb, sizeof *h + sizeof *ch);
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skb->dev = ifp;
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__skb_queue_tail(queue, skb);
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h = (struct aoe_hdr *) skb_mac_header(skb);
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memset(h, 0, sizeof *h + sizeof *ch);
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memset(h->dst, 0xff, sizeof h->dst);
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memcpy(h->src, ifp->dev_addr, sizeof h->src);
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h->type = __constant_cpu_to_be16(ETH_P_AOE);
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h->verfl = AOE_HVER;
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h->major = cpu_to_be16(aoemajor);
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h->minor = aoeminor;
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h->cmd = AOECMD_CFG;
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cont:
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dev_put(ifp);
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}
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rcu_read_unlock();
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}
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static void
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resend(struct aoedev *d, struct frame *f)
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{
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struct sk_buff *skb;
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struct sk_buff_head queue;
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struct aoe_hdr *h;
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struct aoe_atahdr *ah;
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struct aoetgt *t;
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char buf[128];
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u32 n;
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t = f->t;
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n = newtag(d);
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skb = f->skb;
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if (ifrotate(t) == NULL) {
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/* probably can't happen, but set it up to fail anyway */
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pr_info("aoe: resend: no interfaces to rotate to.\n");
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ktcomplete(f, NULL);
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return;
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}
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h = (struct aoe_hdr *) skb_mac_header(skb);
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ah = (struct aoe_atahdr *) (h+1);
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if (!(f->flags & FFL_PROBE)) {
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snprintf(buf, sizeof(buf),
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"%15s e%ld.%d oldtag=%08x@%08lx newtag=%08x s=%pm d=%pm nout=%d\n",
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"retransmit", d->aoemajor, d->aoeminor,
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f->tag, jiffies, n,
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h->src, h->dst, t->nout);
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aoechr_error(buf);
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}
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f->tag = n;
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fhash(f);
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h->tag = cpu_to_be32(n);
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memcpy(h->dst, t->addr, sizeof h->dst);
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memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src);
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skb->dev = t->ifp->nd;
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skb = skb_clone(skb, GFP_ATOMIC);
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if (skb == NULL)
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return;
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do_gettimeofday(&f->sent);
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f->sent_jiffs = (u32) jiffies;
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__skb_queue_head_init(&queue);
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__skb_queue_tail(&queue, skb);
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aoenet_xmit(&queue);
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}
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|
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static int
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tsince_hr(struct frame *f)
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{
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struct timeval now;
|
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int n;
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|
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do_gettimeofday(&now);
|
|
n = now.tv_usec - f->sent.tv_usec;
|
|
n += (now.tv_sec - f->sent.tv_sec) * USEC_PER_SEC;
|
|
|
|
if (n < 0)
|
|
n = -n;
|
|
|
|
/* For relatively long periods, use jiffies to avoid
|
|
* discrepancies caused by updates to the system time.
|
|
*
|
|
* On system with HZ of 1000, 32-bits is over 49 days
|
|
* worth of jiffies, or over 71 minutes worth of usecs.
|
|
*
|
|
* Jiffies overflow is handled by subtraction of unsigned ints:
|
|
* (gdb) print (unsigned) 2 - (unsigned) 0xfffffffe
|
|
* $3 = 4
|
|
* (gdb)
|
|
*/
|
|
if (n > USEC_PER_SEC / 4) {
|
|
n = ((u32) jiffies) - f->sent_jiffs;
|
|
n *= USEC_PER_SEC / HZ;
|
|
}
|
|
|
|
return n;
|
|
}
|
|
|
|
static int
|
|
tsince(u32 tag)
|
|
{
|
|
int n;
|
|
|
|
n = jiffies & 0xffff;
|
|
n -= tag & 0xffff;
|
|
if (n < 0)
|
|
n += 1<<16;
|
|
return jiffies_to_usecs(n + 1);
|
|
}
|
|
|
|
static struct aoeif *
|
|
getif(struct aoetgt *t, struct net_device *nd)
|
|
{
|
|
struct aoeif *p, *e;
|
|
|
|
p = t->ifs;
|
|
e = p + NAOEIFS;
|
|
for (; p < e; p++)
|
|
if (p->nd == nd)
|
|
return p;
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
ejectif(struct aoetgt *t, struct aoeif *ifp)
|
|
{
|
|
struct aoeif *e;
|
|
struct net_device *nd;
|
|
ulong n;
|
|
|
|
nd = ifp->nd;
|
|
e = t->ifs + NAOEIFS - 1;
|
|
n = (e - ifp) * sizeof *ifp;
|
|
memmove(ifp, ifp+1, n);
|
|
e->nd = NULL;
|
|
dev_put(nd);
|
|
}
|
|
|
|
static struct frame *
|
|
reassign_frame(struct frame *f)
|
|
{
|
|
struct frame *nf;
|
|
struct sk_buff *skb;
|
|
|
|
nf = newframe(f->t->d);
|
|
if (!nf)
|
|
return NULL;
|
|
if (nf->t == f->t) {
|
|
aoe_freetframe(nf);
|
|
return NULL;
|
|
}
|
|
|
|
skb = nf->skb;
|
|
nf->skb = f->skb;
|
|
nf->buf = f->buf;
|
|
nf->bcnt = f->bcnt;
|
|
nf->lba = f->lba;
|
|
nf->bv = f->bv;
|
|
nf->bv_off = f->bv_off;
|
|
nf->waited = 0;
|
|
nf->waited_total = f->waited_total;
|
|
nf->sent = f->sent;
|
|
nf->sent_jiffs = f->sent_jiffs;
|
|
f->skb = skb;
|
|
|
|
return nf;
|
|
}
|
|
|
|
static void
|
|
probe(struct aoetgt *t)
|
|
{
|
|
struct aoedev *d;
|
|
struct frame *f;
|
|
struct sk_buff *skb;
|
|
struct sk_buff_head queue;
|
|
size_t n, m;
|
|
int frag;
|
|
|
|
d = t->d;
|
|
f = newtframe(d, t);
|
|
if (!f) {
|
|
pr_err("%s %pm for e%ld.%d: %s\n",
|
|
"aoe: cannot probe remote address",
|
|
t->addr,
|
|
(long) d->aoemajor, d->aoeminor,
|
|
"no frame available");
|
|
return;
|
|
}
|
|
f->flags |= FFL_PROBE;
|
|
ifrotate(t);
|
|
f->bcnt = t->d->maxbcnt ? t->d->maxbcnt : DEFAULTBCNT;
|
|
ata_rw_frameinit(f);
|
|
skb = f->skb;
|
|
for (frag = 0, n = f->bcnt; n > 0; ++frag, n -= m) {
|
|
if (n < PAGE_SIZE)
|
|
m = n;
|
|
else
|
|
m = PAGE_SIZE;
|
|
skb_fill_page_desc(skb, frag, empty_page, 0, m);
|
|
}
|
|
skb->len += f->bcnt;
|
|
skb->data_len = f->bcnt;
|
|
skb->truesize += f->bcnt;
|
|
|
|
skb = skb_clone(f->skb, GFP_ATOMIC);
|
|
if (skb) {
|
|
do_gettimeofday(&f->sent);
|
|
f->sent_jiffs = (u32) jiffies;
|
|
__skb_queue_head_init(&queue);
|
|
__skb_queue_tail(&queue, skb);
|
|
aoenet_xmit(&queue);
|
|
}
|
|
}
|
|
|
|
static long
|
|
rto(struct aoedev *d)
|
|
{
|
|
long t;
|
|
|
|
t = 2 * d->rttavg >> RTTSCALE;
|
|
t += 8 * d->rttdev >> RTTDSCALE;
|
|
if (t == 0)
|
|
t = 1;
|
|
|
|
return t;
|
|
}
|
|
|
|
static void
|
|
rexmit_deferred(struct aoedev *d)
|
|
{
|
|
struct aoetgt *t;
|
|
struct frame *f;
|
|
struct frame *nf;
|
|
struct list_head *pos, *nx, *head;
|
|
int since;
|
|
int untainted;
|
|
|
|
count_targets(d, &untainted);
|
|
|
|
head = &d->rexmitq;
|
|
list_for_each_safe(pos, nx, head) {
|
|
f = list_entry(pos, struct frame, head);
|
|
t = f->t;
|
|
if (t->taint) {
|
|
if (!(f->flags & FFL_PROBE)) {
|
|
nf = reassign_frame(f);
|
|
if (nf) {
|
|
if (t->nout_probes == 0
|
|
&& untainted > 0) {
|
|
probe(t);
|
|
t->nout_probes++;
|
|
}
|
|
list_replace(&f->head, &nf->head);
|
|
pos = &nf->head;
|
|
aoe_freetframe(f);
|
|
f = nf;
|
|
t = f->t;
|
|
}
|
|
} else if (untainted < 1) {
|
|
/* don't probe w/o other untainted aoetgts */
|
|
goto stop_probe;
|
|
} else if (tsince_hr(f) < t->taint * rto(d)) {
|
|
/* reprobe slowly when taint is high */
|
|
continue;
|
|
}
|
|
} else if (f->flags & FFL_PROBE) {
|
|
stop_probe: /* don't probe untainted aoetgts */
|
|
list_del(pos);
|
|
aoe_freetframe(f);
|
|
/* leaving d->kicked, because this is routine */
|
|
f->t->d->flags |= DEVFL_KICKME;
|
|
continue;
|
|
}
|
|
if (t->nout >= t->maxout)
|
|
continue;
|
|
list_del(pos);
|
|
t->nout++;
|
|
if (f->flags & FFL_PROBE)
|
|
t->nout_probes++;
|
|
since = tsince_hr(f);
|
|
f->waited += since;
|
|
f->waited_total += since;
|
|
resend(d, f);
|
|
}
|
|
}
|
|
|
|
/* An aoetgt accumulates demerits quickly, and successful
|
|
* probing redeems the aoetgt slowly.
|
|
*/
|
|
static void
|
|
scorn(struct aoetgt *t)
|
|
{
|
|
int n;
|
|
|
|
n = t->taint++;
|
|
t->taint += t->taint * 2;
|
|
if (n > t->taint)
|
|
t->taint = n;
|
|
if (t->taint > MAX_TAINT)
|
|
t->taint = MAX_TAINT;
|
|
}
|
|
|
|
static int
|
|
count_targets(struct aoedev *d, int *untainted)
|
|
{
|
|
int i, good;
|
|
|
|
for (i = good = 0; i < d->ntargets && d->targets[i]; ++i)
|
|
if (d->targets[i]->taint == 0)
|
|
good++;
|
|
|
|
if (untainted)
|
|
*untainted = good;
|
|
return i;
|
|
}
|
|
|
|
static void
|
|
rexmit_timer(ulong vp)
|
|
{
|
|
struct aoedev *d;
|
|
struct aoetgt *t;
|
|
struct aoeif *ifp;
|
|
struct frame *f;
|
|
struct list_head *head, *pos, *nx;
|
|
LIST_HEAD(flist);
|
|
register long timeout;
|
|
ulong flags, n;
|
|
int i;
|
|
int utgts; /* number of aoetgt descriptors (not slots) */
|
|
int since;
|
|
|
|
d = (struct aoedev *) vp;
|
|
|
|
spin_lock_irqsave(&d->lock, flags);
|
|
|
|
/* timeout based on observed timings and variations */
|
|
timeout = rto(d);
|
|
|
|
utgts = count_targets(d, NULL);
|
|
|
|
if (d->flags & DEVFL_TKILL) {
|
|
spin_unlock_irqrestore(&d->lock, flags);
|
|
return;
|
|
}
|
|
|
|
/* collect all frames to rexmit into flist */
|
|
for (i = 0; i < NFACTIVE; i++) {
|
|
head = &d->factive[i];
|
|
list_for_each_safe(pos, nx, head) {
|
|
f = list_entry(pos, struct frame, head);
|
|
if (tsince_hr(f) < timeout)
|
|
break; /* end of expired frames */
|
|
/* move to flist for later processing */
|
|
list_move_tail(pos, &flist);
|
|
}
|
|
}
|
|
|
|
/* process expired frames */
|
|
while (!list_empty(&flist)) {
|
|
pos = flist.next;
|
|
f = list_entry(pos, struct frame, head);
|
|
since = tsince_hr(f);
|
|
n = f->waited_total + since;
|
|
n /= USEC_PER_SEC;
|
|
if (aoe_deadsecs
|
|
&& n > aoe_deadsecs
|
|
&& !(f->flags & FFL_PROBE)) {
|
|
/* Waited too long. Device failure.
|
|
* Hang all frames on first hash bucket for downdev
|
|
* to clean up.
|
|
*/
|
|
list_splice(&flist, &d->factive[0]);
|
|
aoedev_downdev(d);
|
|
goto out;
|
|
}
|
|
|
|
t = f->t;
|
|
n = f->waited + since;
|
|
n /= USEC_PER_SEC;
|
|
if (aoe_deadsecs && utgts > 0
|
|
&& (n > aoe_deadsecs / utgts || n > HARD_SCORN_SECS))
|
|
scorn(t); /* avoid this target */
|
|
|
|
if (t->maxout != 1) {
|
|
t->ssthresh = t->maxout / 2;
|
|
t->maxout = 1;
|
|
}
|
|
|
|
if (f->flags & FFL_PROBE) {
|
|
t->nout_probes--;
|
|
} else {
|
|
ifp = getif(t, f->skb->dev);
|
|
if (ifp && ++ifp->lost > (t->nframes << 1)
|
|
&& (ifp != t->ifs || t->ifs[1].nd)) {
|
|
ejectif(t, ifp);
|
|
ifp = NULL;
|
|
}
|
|
}
|
|
list_move_tail(pos, &d->rexmitq);
|
|
t->nout--;
|
|
}
|
|
rexmit_deferred(d);
|
|
|
|
out:
|
|
if ((d->flags & DEVFL_KICKME) && d->blkq) {
|
|
d->flags &= ~DEVFL_KICKME;
|
|
d->blkq->request_fn(d->blkq);
|
|
}
|
|
|
|
d->timer.expires = jiffies + TIMERTICK;
|
|
add_timer(&d->timer);
|
|
|
|
spin_unlock_irqrestore(&d->lock, flags);
|
|
}
|
|
|
|
static unsigned long
|
|
rqbiocnt(struct request *r)
|
|
{
|
|
struct bio *bio;
|
|
unsigned long n = 0;
|
|
|
|
__rq_for_each_bio(bio, r)
|
|
n++;
|
|
return n;
|
|
}
|
|
|
|
/* This can be removed if we are certain that no users of the block
|
|
* layer will ever use zero-count pages in bios. Otherwise we have to
|
|
* protect against the put_page sometimes done by the network layer.
|
|
*
|
|
* See http://oss.sgi.com/archives/xfs/2007-01/msg00594.html for
|
|
* discussion.
|
|
*
|
|
* We cannot use get_page in the workaround, because it insists on a
|
|
* positive page count as a precondition. So we use _count directly.
|
|
*/
|
|
static void
|
|
bio_pageinc(struct bio *bio)
|
|
{
|
|
struct bio_vec *bv;
|
|
struct page *page;
|
|
int i;
|
|
|
|
bio_for_each_segment(bv, bio, i) {
|
|
page = bv->bv_page;
|
|
/* Non-zero page count for non-head members of
|
|
* compound pages is no longer allowed by the kernel,
|
|
* but this has never been seen here.
|
|
*/
|
|
if (unlikely(PageCompound(page)))
|
|
if (compound_trans_head(page) != page) {
|
|
pr_crit("page tail used for block I/O\n");
|
|
BUG();
|
|
}
|
|
atomic_inc(&page->_count);
|
|
}
|
|
}
|
|
|
|
static void
|
|
bio_pagedec(struct bio *bio)
|
|
{
|
|
struct bio_vec *bv;
|
|
int i;
|
|
|
|
bio_for_each_segment(bv, bio, i)
|
|
atomic_dec(&bv->bv_page->_count);
|
|
}
|
|
|
|
static void
|
|
bufinit(struct buf *buf, struct request *rq, struct bio *bio)
|
|
{
|
|
struct bio_vec *bv;
|
|
|
|
memset(buf, 0, sizeof(*buf));
|
|
buf->rq = rq;
|
|
buf->bio = bio;
|
|
buf->resid = bio->bi_size;
|
|
buf->sector = bio->bi_sector;
|
|
bio_pageinc(bio);
|
|
buf->bv = bv = &bio->bi_io_vec[bio->bi_idx];
|
|
buf->bv_resid = bv->bv_len;
|
|
WARN_ON(buf->bv_resid == 0);
|
|
}
|
|
|
|
static struct buf *
|
|
nextbuf(struct aoedev *d)
|
|
{
|
|
struct request *rq;
|
|
struct request_queue *q;
|
|
struct buf *buf;
|
|
struct bio *bio;
|
|
|
|
q = d->blkq;
|
|
if (q == NULL)
|
|
return NULL; /* initializing */
|
|
if (d->ip.buf)
|
|
return d->ip.buf;
|
|
rq = d->ip.rq;
|
|
if (rq == NULL) {
|
|
rq = blk_peek_request(q);
|
|
if (rq == NULL)
|
|
return NULL;
|
|
blk_start_request(rq);
|
|
d->ip.rq = rq;
|
|
d->ip.nxbio = rq->bio;
|
|
rq->special = (void *) rqbiocnt(rq);
|
|
}
|
|
buf = mempool_alloc(d->bufpool, GFP_ATOMIC);
|
|
if (buf == NULL) {
|
|
pr_err("aoe: nextbuf: unable to mempool_alloc!\n");
|
|
return NULL;
|
|
}
|
|
bio = d->ip.nxbio;
|
|
bufinit(buf, rq, bio);
|
|
bio = bio->bi_next;
|
|
d->ip.nxbio = bio;
|
|
if (bio == NULL)
|
|
d->ip.rq = NULL;
|
|
return d->ip.buf = buf;
|
|
}
|
|
|
|
/* enters with d->lock held */
|
|
void
|
|
aoecmd_work(struct aoedev *d)
|
|
{
|
|
rexmit_deferred(d);
|
|
while (aoecmd_ata_rw(d))
|
|
;
|
|
}
|
|
|
|
/* this function performs work that has been deferred until sleeping is OK
|
|
*/
|
|
void
|
|
aoecmd_sleepwork(struct work_struct *work)
|
|
{
|
|
struct aoedev *d = container_of(work, struct aoedev, work);
|
|
struct block_device *bd;
|
|
u64 ssize;
|
|
|
|
if (d->flags & DEVFL_GDALLOC)
|
|
aoeblk_gdalloc(d);
|
|
|
|
if (d->flags & DEVFL_NEWSIZE) {
|
|
ssize = get_capacity(d->gd);
|
|
bd = bdget_disk(d->gd, 0);
|
|
if (bd) {
|
|
mutex_lock(&bd->bd_inode->i_mutex);
|
|
i_size_write(bd->bd_inode, (loff_t)ssize<<9);
|
|
mutex_unlock(&bd->bd_inode->i_mutex);
|
|
bdput(bd);
|
|
}
|
|
spin_lock_irq(&d->lock);
|
|
d->flags |= DEVFL_UP;
|
|
d->flags &= ~DEVFL_NEWSIZE;
|
|
spin_unlock_irq(&d->lock);
|
|
}
|
|
}
|
|
|
|
static void
|
|
ata_ident_fixstring(u16 *id, int ns)
|
|
{
|
|
u16 s;
|
|
|
|
while (ns-- > 0) {
|
|
s = *id;
|
|
*id++ = s >> 8 | s << 8;
|
|
}
|
|
}
|
|
|
|
static void
|
|
ataid_complete(struct aoedev *d, struct aoetgt *t, unsigned char *id)
|
|
{
|
|
u64 ssize;
|
|
u16 n;
|
|
|
|
/* word 83: command set supported */
|
|
n = get_unaligned_le16(&id[83 << 1]);
|
|
|
|
/* word 86: command set/feature enabled */
|
|
n |= get_unaligned_le16(&id[86 << 1]);
|
|
|
|
if (n & (1<<10)) { /* bit 10: LBA 48 */
|
|
d->flags |= DEVFL_EXT;
|
|
|
|
/* word 100: number lba48 sectors */
|
|
ssize = get_unaligned_le64(&id[100 << 1]);
|
|
|
|
/* set as in ide-disk.c:init_idedisk_capacity */
|
|
d->geo.cylinders = ssize;
|
|
d->geo.cylinders /= (255 * 63);
|
|
d->geo.heads = 255;
|
|
d->geo.sectors = 63;
|
|
} else {
|
|
d->flags &= ~DEVFL_EXT;
|
|
|
|
/* number lba28 sectors */
|
|
ssize = get_unaligned_le32(&id[60 << 1]);
|
|
|
|
/* NOTE: obsolete in ATA 6 */
|
|
d->geo.cylinders = get_unaligned_le16(&id[54 << 1]);
|
|
d->geo.heads = get_unaligned_le16(&id[55 << 1]);
|
|
d->geo.sectors = get_unaligned_le16(&id[56 << 1]);
|
|
}
|
|
|
|
ata_ident_fixstring((u16 *) &id[10<<1], 10); /* serial */
|
|
ata_ident_fixstring((u16 *) &id[23<<1], 4); /* firmware */
|
|
ata_ident_fixstring((u16 *) &id[27<<1], 20); /* model */
|
|
memcpy(d->ident, id, sizeof(d->ident));
|
|
|
|
if (d->ssize != ssize)
|
|
printk(KERN_INFO
|
|
"aoe: %pm e%ld.%d v%04x has %llu sectors\n",
|
|
t->addr,
|
|
d->aoemajor, d->aoeminor,
|
|
d->fw_ver, (long long)ssize);
|
|
d->ssize = ssize;
|
|
d->geo.start = 0;
|
|
if (d->flags & (DEVFL_GDALLOC|DEVFL_NEWSIZE))
|
|
return;
|
|
if (d->gd != NULL) {
|
|
set_capacity(d->gd, ssize);
|
|
d->flags |= DEVFL_NEWSIZE;
|
|
} else
|
|
d->flags |= DEVFL_GDALLOC;
|
|
schedule_work(&d->work);
|
|
}
|
|
|
|
static void
|
|
calc_rttavg(struct aoedev *d, struct aoetgt *t, int rtt)
|
|
{
|
|
register long n;
|
|
|
|
n = rtt;
|
|
|
|
/* cf. Congestion Avoidance and Control, Jacobson & Karels, 1988 */
|
|
n -= d->rttavg >> RTTSCALE;
|
|
d->rttavg += n;
|
|
if (n < 0)
|
|
n = -n;
|
|
n -= d->rttdev >> RTTDSCALE;
|
|
d->rttdev += n;
|
|
|
|
if (!t || t->maxout >= t->nframes)
|
|
return;
|
|
if (t->maxout < t->ssthresh)
|
|
t->maxout += 1;
|
|
else if (t->nout == t->maxout && t->next_cwnd-- == 0) {
|
|
t->maxout += 1;
|
|
t->next_cwnd = t->maxout;
|
|
}
|
|
}
|
|
|
|
static struct aoetgt *
|
|
gettgt(struct aoedev *d, char *addr)
|
|
{
|
|
struct aoetgt **t, **e;
|
|
|
|
t = d->targets;
|
|
e = t + d->ntargets;
|
|
for (; t < e && *t; t++)
|
|
if (memcmp((*t)->addr, addr, sizeof((*t)->addr)) == 0)
|
|
return *t;
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
bvcpy(struct bio_vec *bv, ulong off, struct sk_buff *skb, long cnt)
|
|
{
|
|
ulong fcnt;
|
|
char *p;
|
|
int soff = 0;
|
|
loop:
|
|
fcnt = bv->bv_len - (off - bv->bv_offset);
|
|
if (fcnt > cnt)
|
|
fcnt = cnt;
|
|
p = page_address(bv->bv_page) + off;
|
|
skb_copy_bits(skb, soff, p, fcnt);
|
|
soff += fcnt;
|
|
cnt -= fcnt;
|
|
if (cnt <= 0)
|
|
return;
|
|
bv++;
|
|
off = bv->bv_offset;
|
|
goto loop;
|
|
}
|
|
|
|
void
|
|
aoe_end_request(struct aoedev *d, struct request *rq, int fastfail)
|
|
{
|
|
struct bio *bio;
|
|
int bok;
|
|
struct request_queue *q;
|
|
|
|
q = d->blkq;
|
|
if (rq == d->ip.rq)
|
|
d->ip.rq = NULL;
|
|
do {
|
|
bio = rq->bio;
|
|
bok = !fastfail && test_bit(BIO_UPTODATE, &bio->bi_flags);
|
|
} while (__blk_end_request(rq, bok ? 0 : -EIO, bio->bi_size));
|
|
|
|
/* cf. http://lkml.org/lkml/2006/10/31/28 */
|
|
if (!fastfail)
|
|
__blk_run_queue(q);
|
|
}
|
|
|
|
static void
|
|
aoe_end_buf(struct aoedev *d, struct buf *buf)
|
|
{
|
|
struct request *rq;
|
|
unsigned long n;
|
|
|
|
if (buf == d->ip.buf)
|
|
d->ip.buf = NULL;
|
|
rq = buf->rq;
|
|
bio_pagedec(buf->bio);
|
|
mempool_free(buf, d->bufpool);
|
|
n = (unsigned long) rq->special;
|
|
rq->special = (void *) --n;
|
|
if (n == 0)
|
|
aoe_end_request(d, rq, 0);
|
|
}
|
|
|
|
static void
|
|
ktiocomplete(struct frame *f)
|
|
{
|
|
struct aoe_hdr *hin, *hout;
|
|
struct aoe_atahdr *ahin, *ahout;
|
|
struct buf *buf;
|
|
struct sk_buff *skb;
|
|
struct aoetgt *t;
|
|
struct aoeif *ifp;
|
|
struct aoedev *d;
|
|
long n;
|
|
int untainted;
|
|
|
|
if (f == NULL)
|
|
return;
|
|
|
|
t = f->t;
|
|
d = t->d;
|
|
skb = f->r_skb;
|
|
buf = f->buf;
|
|
if (f->flags & FFL_PROBE)
|
|
goto out;
|
|
if (!skb) /* just fail the buf. */
|
|
goto noskb;
|
|
|
|
hout = (struct aoe_hdr *) skb_mac_header(f->skb);
|
|
ahout = (struct aoe_atahdr *) (hout+1);
|
|
|
|
hin = (struct aoe_hdr *) skb->data;
|
|
skb_pull(skb, sizeof(*hin));
|
|
ahin = (struct aoe_atahdr *) skb->data;
|
|
skb_pull(skb, sizeof(*ahin));
|
|
if (ahin->cmdstat & 0xa9) { /* these bits cleared on success */
|
|
pr_err("aoe: ata error cmd=%2.2Xh stat=%2.2Xh from e%ld.%d\n",
|
|
ahout->cmdstat, ahin->cmdstat,
|
|
d->aoemajor, d->aoeminor);
|
|
noskb: if (buf)
|
|
clear_bit(BIO_UPTODATE, &buf->bio->bi_flags);
|
|
goto out;
|
|
}
|
|
|
|
n = ahout->scnt << 9;
|
|
switch (ahout->cmdstat) {
|
|
case ATA_CMD_PIO_READ:
|
|
case ATA_CMD_PIO_READ_EXT:
|
|
if (skb->len < n) {
|
|
pr_err("%s e%ld.%d. skb->len=%d need=%ld\n",
|
|
"aoe: runt data size in read from",
|
|
(long) d->aoemajor, d->aoeminor,
|
|
skb->len, n);
|
|
clear_bit(BIO_UPTODATE, &buf->bio->bi_flags);
|
|
break;
|
|
}
|
|
bvcpy(f->bv, f->bv_off, skb, n);
|
|
case ATA_CMD_PIO_WRITE:
|
|
case ATA_CMD_PIO_WRITE_EXT:
|
|
spin_lock_irq(&d->lock);
|
|
ifp = getif(t, skb->dev);
|
|
if (ifp)
|
|
ifp->lost = 0;
|
|
spin_unlock_irq(&d->lock);
|
|
break;
|
|
case ATA_CMD_ID_ATA:
|
|
if (skb->len < 512) {
|
|
pr_info("%s e%ld.%d. skb->len=%d need=512\n",
|
|
"aoe: runt data size in ataid from",
|
|
(long) d->aoemajor, d->aoeminor,
|
|
skb->len);
|
|
break;
|
|
}
|
|
if (skb_linearize(skb))
|
|
break;
|
|
spin_lock_irq(&d->lock);
|
|
ataid_complete(d, t, skb->data);
|
|
spin_unlock_irq(&d->lock);
|
|
break;
|
|
default:
|
|
pr_info("aoe: unrecognized ata command %2.2Xh for %d.%d\n",
|
|
ahout->cmdstat,
|
|
be16_to_cpu(get_unaligned(&hin->major)),
|
|
hin->minor);
|
|
}
|
|
out:
|
|
spin_lock_irq(&d->lock);
|
|
if (t->taint > 0
|
|
&& --t->taint > 0
|
|
&& t->nout_probes == 0) {
|
|
count_targets(d, &untainted);
|
|
if (untainted > 0) {
|
|
probe(t);
|
|
t->nout_probes++;
|
|
}
|
|
}
|
|
|
|
aoe_freetframe(f);
|
|
|
|
if (buf && --buf->nframesout == 0 && buf->resid == 0)
|
|
aoe_end_buf(d, buf);
|
|
|
|
spin_unlock_irq(&d->lock);
|
|
aoedev_put(d);
|
|
dev_kfree_skb(skb);
|
|
}
|
|
|
|
/* Enters with iocq.lock held.
|
|
* Returns true iff responses needing processing remain.
|
|
*/
|
|
static int
|
|
ktio(void)
|
|
{
|
|
struct frame *f;
|
|
struct list_head *pos;
|
|
int i;
|
|
|
|
for (i = 0; ; ++i) {
|
|
if (i == MAXIOC)
|
|
return 1;
|
|
if (list_empty(&iocq.head))
|
|
return 0;
|
|
pos = iocq.head.next;
|
|
list_del(pos);
|
|
spin_unlock_irq(&iocq.lock);
|
|
f = list_entry(pos, struct frame, head);
|
|
ktiocomplete(f);
|
|
spin_lock_irq(&iocq.lock);
|
|
}
|
|
}
|
|
|
|
static int
|
|
kthread(void *vp)
|
|
{
|
|
struct ktstate *k;
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
int more;
|
|
|
|
k = vp;
|
|
current->flags |= PF_NOFREEZE;
|
|
set_user_nice(current, -10);
|
|
complete(&k->rendez); /* tell spawner we're running */
|
|
do {
|
|
spin_lock_irq(k->lock);
|
|
more = k->fn();
|
|
if (!more) {
|
|
add_wait_queue(k->waitq, &wait);
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
|
}
|
|
spin_unlock_irq(k->lock);
|
|
if (!more) {
|
|
schedule();
|
|
remove_wait_queue(k->waitq, &wait);
|
|
} else
|
|
cond_resched();
|
|
} while (!kthread_should_stop());
|
|
complete(&k->rendez); /* tell spawner we're stopping */
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
aoe_ktstop(struct ktstate *k)
|
|
{
|
|
kthread_stop(k->task);
|
|
wait_for_completion(&k->rendez);
|
|
}
|
|
|
|
int
|
|
aoe_ktstart(struct ktstate *k)
|
|
{
|
|
struct task_struct *task;
|
|
|
|
init_completion(&k->rendez);
|
|
task = kthread_run(kthread, k, k->name);
|
|
if (task == NULL || IS_ERR(task))
|
|
return -ENOMEM;
|
|
k->task = task;
|
|
wait_for_completion(&k->rendez); /* allow kthread to start */
|
|
init_completion(&k->rendez); /* for waiting for exit later */
|
|
return 0;
|
|
}
|
|
|
|
/* pass it off to kthreads for processing */
|
|
static void
|
|
ktcomplete(struct frame *f, struct sk_buff *skb)
|
|
{
|
|
ulong flags;
|
|
|
|
f->r_skb = skb;
|
|
spin_lock_irqsave(&iocq.lock, flags);
|
|
list_add_tail(&f->head, &iocq.head);
|
|
spin_unlock_irqrestore(&iocq.lock, flags);
|
|
wake_up(&ktiowq);
|
|
}
|
|
|
|
struct sk_buff *
|
|
aoecmd_ata_rsp(struct sk_buff *skb)
|
|
{
|
|
struct aoedev *d;
|
|
struct aoe_hdr *h;
|
|
struct frame *f;
|
|
u32 n;
|
|
ulong flags;
|
|
char ebuf[128];
|
|
u16 aoemajor;
|
|
|
|
h = (struct aoe_hdr *) skb->data;
|
|
aoemajor = be16_to_cpu(get_unaligned(&h->major));
|
|
d = aoedev_by_aoeaddr(aoemajor, h->minor, 0);
|
|
if (d == NULL) {
|
|
snprintf(ebuf, sizeof ebuf, "aoecmd_ata_rsp: ata response "
|
|
"for unknown device %d.%d\n",
|
|
aoemajor, h->minor);
|
|
aoechr_error(ebuf);
|
|
return skb;
|
|
}
|
|
|
|
spin_lock_irqsave(&d->lock, flags);
|
|
|
|
n = be32_to_cpu(get_unaligned(&h->tag));
|
|
f = getframe(d, n);
|
|
if (f) {
|
|
calc_rttavg(d, f->t, tsince_hr(f));
|
|
f->t->nout--;
|
|
if (f->flags & FFL_PROBE)
|
|
f->t->nout_probes--;
|
|
} else {
|
|
f = getframe_deferred(d, n);
|
|
if (f) {
|
|
calc_rttavg(d, NULL, tsince_hr(f));
|
|
} else {
|
|
calc_rttavg(d, NULL, tsince(n));
|
|
spin_unlock_irqrestore(&d->lock, flags);
|
|
aoedev_put(d);
|
|
snprintf(ebuf, sizeof(ebuf),
|
|
"%15s e%d.%d tag=%08x@%08lx s=%pm d=%pm\n",
|
|
"unexpected rsp",
|
|
get_unaligned_be16(&h->major),
|
|
h->minor,
|
|
get_unaligned_be32(&h->tag),
|
|
jiffies,
|
|
h->src,
|
|
h->dst);
|
|
aoechr_error(ebuf);
|
|
return skb;
|
|
}
|
|
}
|
|
aoecmd_work(d);
|
|
|
|
spin_unlock_irqrestore(&d->lock, flags);
|
|
|
|
ktcomplete(f, skb);
|
|
|
|
/*
|
|
* Note here that we do not perform an aoedev_put, as we are
|
|
* leaving this reference for the ktio to release.
|
|
*/
|
|
return NULL;
|
|
}
|
|
|
|
void
|
|
aoecmd_cfg(ushort aoemajor, unsigned char aoeminor)
|
|
{
|
|
struct sk_buff_head queue;
|
|
|
|
__skb_queue_head_init(&queue);
|
|
aoecmd_cfg_pkts(aoemajor, aoeminor, &queue);
|
|
aoenet_xmit(&queue);
|
|
}
|
|
|
|
struct sk_buff *
|
|
aoecmd_ata_id(struct aoedev *d)
|
|
{
|
|
struct aoe_hdr *h;
|
|
struct aoe_atahdr *ah;
|
|
struct frame *f;
|
|
struct sk_buff *skb;
|
|
struct aoetgt *t;
|
|
|
|
f = newframe(d);
|
|
if (f == NULL)
|
|
return NULL;
|
|
|
|
t = *d->tgt;
|
|
|
|
/* initialize the headers & frame */
|
|
skb = f->skb;
|
|
h = (struct aoe_hdr *) skb_mac_header(skb);
|
|
ah = (struct aoe_atahdr *) (h+1);
|
|
skb_put(skb, sizeof *h + sizeof *ah);
|
|
memset(h, 0, skb->len);
|
|
f->tag = aoehdr_atainit(d, t, h);
|
|
fhash(f);
|
|
t->nout++;
|
|
f->waited = 0;
|
|
f->waited_total = 0;
|
|
|
|
/* set up ata header */
|
|
ah->scnt = 1;
|
|
ah->cmdstat = ATA_CMD_ID_ATA;
|
|
ah->lba3 = 0xa0;
|
|
|
|
skb->dev = t->ifp->nd;
|
|
|
|
d->rttavg = RTTAVG_INIT;
|
|
d->rttdev = RTTDEV_INIT;
|
|
d->timer.function = rexmit_timer;
|
|
|
|
skb = skb_clone(skb, GFP_ATOMIC);
|
|
if (skb) {
|
|
do_gettimeofday(&f->sent);
|
|
f->sent_jiffs = (u32) jiffies;
|
|
}
|
|
|
|
return skb;
|
|
}
|
|
|
|
static struct aoetgt **
|
|
grow_targets(struct aoedev *d)
|
|
{
|
|
ulong oldn, newn;
|
|
struct aoetgt **tt;
|
|
|
|
oldn = d->ntargets;
|
|
newn = oldn * 2;
|
|
tt = kcalloc(newn, sizeof(*d->targets), GFP_ATOMIC);
|
|
if (!tt)
|
|
return NULL;
|
|
memmove(tt, d->targets, sizeof(*d->targets) * oldn);
|
|
d->tgt = tt + (d->tgt - d->targets);
|
|
kfree(d->targets);
|
|
d->targets = tt;
|
|
d->ntargets = newn;
|
|
|
|
return &d->targets[oldn];
|
|
}
|
|
|
|
static struct aoetgt *
|
|
addtgt(struct aoedev *d, char *addr, ulong nframes)
|
|
{
|
|
struct aoetgt *t, **tt, **te;
|
|
|
|
tt = d->targets;
|
|
te = tt + d->ntargets;
|
|
for (; tt < te && *tt; tt++)
|
|
;
|
|
|
|
if (tt == te) {
|
|
tt = grow_targets(d);
|
|
if (!tt)
|
|
goto nomem;
|
|
}
|
|
t = kzalloc(sizeof(*t), GFP_ATOMIC);
|
|
if (!t)
|
|
goto nomem;
|
|
t->nframes = nframes;
|
|
t->d = d;
|
|
memcpy(t->addr, addr, sizeof t->addr);
|
|
t->ifp = t->ifs;
|
|
aoecmd_wreset(t);
|
|
t->maxout = t->nframes / 2;
|
|
INIT_LIST_HEAD(&t->ffree);
|
|
return *tt = t;
|
|
|
|
nomem:
|
|
pr_info("aoe: cannot allocate memory to add target\n");
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
setdbcnt(struct aoedev *d)
|
|
{
|
|
struct aoetgt **t, **e;
|
|
int bcnt = 0;
|
|
|
|
t = d->targets;
|
|
e = t + d->ntargets;
|
|
for (; t < e && *t; t++)
|
|
if (bcnt == 0 || bcnt > (*t)->minbcnt)
|
|
bcnt = (*t)->minbcnt;
|
|
if (bcnt != d->maxbcnt) {
|
|
d->maxbcnt = bcnt;
|
|
pr_info("aoe: e%ld.%d: setting %d byte data frames\n",
|
|
d->aoemajor, d->aoeminor, bcnt);
|
|
}
|
|
}
|
|
|
|
static void
|
|
setifbcnt(struct aoetgt *t, struct net_device *nd, int bcnt)
|
|
{
|
|
struct aoedev *d;
|
|
struct aoeif *p, *e;
|
|
int minbcnt;
|
|
|
|
d = t->d;
|
|
minbcnt = bcnt;
|
|
p = t->ifs;
|
|
e = p + NAOEIFS;
|
|
for (; p < e; p++) {
|
|
if (p->nd == NULL)
|
|
break; /* end of the valid interfaces */
|
|
if (p->nd == nd) {
|
|
p->bcnt = bcnt; /* we're updating */
|
|
nd = NULL;
|
|
} else if (minbcnt > p->bcnt)
|
|
minbcnt = p->bcnt; /* find the min interface */
|
|
}
|
|
if (nd) {
|
|
if (p == e) {
|
|
pr_err("aoe: device setifbcnt failure; too many interfaces.\n");
|
|
return;
|
|
}
|
|
dev_hold(nd);
|
|
p->nd = nd;
|
|
p->bcnt = bcnt;
|
|
}
|
|
t->minbcnt = minbcnt;
|
|
setdbcnt(d);
|
|
}
|
|
|
|
void
|
|
aoecmd_cfg_rsp(struct sk_buff *skb)
|
|
{
|
|
struct aoedev *d;
|
|
struct aoe_hdr *h;
|
|
struct aoe_cfghdr *ch;
|
|
struct aoetgt *t;
|
|
ulong flags, aoemajor;
|
|
struct sk_buff *sl;
|
|
struct sk_buff_head queue;
|
|
u16 n;
|
|
|
|
sl = NULL;
|
|
h = (struct aoe_hdr *) skb_mac_header(skb);
|
|
ch = (struct aoe_cfghdr *) (h+1);
|
|
|
|
/*
|
|
* Enough people have their dip switches set backwards to
|
|
* warrant a loud message for this special case.
|
|
*/
|
|
aoemajor = get_unaligned_be16(&h->major);
|
|
if (aoemajor == 0xfff) {
|
|
printk(KERN_ERR "aoe: Warning: shelf address is all ones. "
|
|
"Check shelf dip switches.\n");
|
|
return;
|
|
}
|
|
if (aoemajor == 0xffff) {
|
|
pr_info("aoe: e%ld.%d: broadcast shelf number invalid\n",
|
|
aoemajor, (int) h->minor);
|
|
return;
|
|
}
|
|
if (h->minor == 0xff) {
|
|
pr_info("aoe: e%ld.%d: broadcast slot number invalid\n",
|
|
aoemajor, (int) h->minor);
|
|
return;
|
|
}
|
|
|
|
n = be16_to_cpu(ch->bufcnt);
|
|
if (n > aoe_maxout) /* keep it reasonable */
|
|
n = aoe_maxout;
|
|
|
|
d = aoedev_by_aoeaddr(aoemajor, h->minor, 1);
|
|
if (d == NULL) {
|
|
pr_info("aoe: device allocation failure\n");
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(&d->lock, flags);
|
|
|
|
t = gettgt(d, h->src);
|
|
if (t) {
|
|
t->nframes = n;
|
|
if (n < t->maxout)
|
|
aoecmd_wreset(t);
|
|
} else {
|
|
t = addtgt(d, h->src, n);
|
|
if (!t)
|
|
goto bail;
|
|
}
|
|
n = skb->dev->mtu;
|
|
n -= sizeof(struct aoe_hdr) + sizeof(struct aoe_atahdr);
|
|
n /= 512;
|
|
if (n > ch->scnt)
|
|
n = ch->scnt;
|
|
n = n ? n * 512 : DEFAULTBCNT;
|
|
setifbcnt(t, skb->dev, n);
|
|
|
|
/* don't change users' perspective */
|
|
if (d->nopen == 0) {
|
|
d->fw_ver = be16_to_cpu(ch->fwver);
|
|
sl = aoecmd_ata_id(d);
|
|
}
|
|
bail:
|
|
spin_unlock_irqrestore(&d->lock, flags);
|
|
aoedev_put(d);
|
|
if (sl) {
|
|
__skb_queue_head_init(&queue);
|
|
__skb_queue_tail(&queue, sl);
|
|
aoenet_xmit(&queue);
|
|
}
|
|
}
|
|
|
|
void
|
|
aoecmd_wreset(struct aoetgt *t)
|
|
{
|
|
t->maxout = 1;
|
|
t->ssthresh = t->nframes / 2;
|
|
t->next_cwnd = t->nframes;
|
|
}
|
|
|
|
void
|
|
aoecmd_cleanslate(struct aoedev *d)
|
|
{
|
|
struct aoetgt **t, **te;
|
|
|
|
d->rttavg = RTTAVG_INIT;
|
|
d->rttdev = RTTDEV_INIT;
|
|
d->maxbcnt = 0;
|
|
|
|
t = d->targets;
|
|
te = t + d->ntargets;
|
|
for (; t < te && *t; t++)
|
|
aoecmd_wreset(*t);
|
|
}
|
|
|
|
void
|
|
aoe_failbuf(struct aoedev *d, struct buf *buf)
|
|
{
|
|
if (buf == NULL)
|
|
return;
|
|
buf->resid = 0;
|
|
clear_bit(BIO_UPTODATE, &buf->bio->bi_flags);
|
|
if (buf->nframesout == 0)
|
|
aoe_end_buf(d, buf);
|
|
}
|
|
|
|
void
|
|
aoe_flush_iocq(void)
|
|
{
|
|
struct frame *f;
|
|
struct aoedev *d;
|
|
LIST_HEAD(flist);
|
|
struct list_head *pos;
|
|
struct sk_buff *skb;
|
|
ulong flags;
|
|
|
|
spin_lock_irqsave(&iocq.lock, flags);
|
|
list_splice_init(&iocq.head, &flist);
|
|
spin_unlock_irqrestore(&iocq.lock, flags);
|
|
while (!list_empty(&flist)) {
|
|
pos = flist.next;
|
|
list_del(pos);
|
|
f = list_entry(pos, struct frame, head);
|
|
d = f->t->d;
|
|
skb = f->r_skb;
|
|
spin_lock_irqsave(&d->lock, flags);
|
|
if (f->buf) {
|
|
f->buf->nframesout--;
|
|
aoe_failbuf(d, f->buf);
|
|
}
|
|
aoe_freetframe(f);
|
|
spin_unlock_irqrestore(&d->lock, flags);
|
|
dev_kfree_skb(skb);
|
|
aoedev_put(d);
|
|
}
|
|
}
|
|
|
|
int __init
|
|
aoecmd_init(void)
|
|
{
|
|
void *p;
|
|
|
|
/* get_zeroed_page returns page with ref count 1 */
|
|
p = (void *) get_zeroed_page(GFP_KERNEL | __GFP_REPEAT);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
empty_page = virt_to_page(p);
|
|
|
|
INIT_LIST_HEAD(&iocq.head);
|
|
spin_lock_init(&iocq.lock);
|
|
init_waitqueue_head(&ktiowq);
|
|
kts.name = "aoe_ktio";
|
|
kts.fn = ktio;
|
|
kts.waitq = &ktiowq;
|
|
kts.lock = &iocq.lock;
|
|
return aoe_ktstart(&kts);
|
|
}
|
|
|
|
void
|
|
aoecmd_exit(void)
|
|
{
|
|
aoe_ktstop(&kts);
|
|
aoe_flush_iocq();
|
|
|
|
free_page((unsigned long) page_address(empty_page));
|
|
empty_page = NULL;
|
|
}
|