u16 last_read; /* last xid allocated for read */
u32 total_exches; /* total allocated exchanges */
struct list_head ex_list; /* allocated exchanges list */
- struct fc_lport *lp; /* fc device instance */
mempool_t *ep_pool; /* reserve ep's */
/*
mp = ep->em;
if (ep->destructor)
ep->destructor(&ep->seq, ep->arg);
- if (ep->lp->tt.exch_put)
- ep->lp->tt.exch_put(ep->lp, mp, ep->xid);
WARN_ON(!(ep->esb_stat & ESB_ST_COMPLETE));
mempool_free(ep, mp->ep_pool);
}
return xid;
}
-/*
- * fc_exch_alloc - allocate an exchange.
- * @mp : ptr to the exchange manager
- * @xid: input xid
+/**
+ * fc_exch_em_alloc() - allocate an exchange from a specified EM.
+ * @lport: ptr to the local port
+ * @mp: ptr to the exchange manager
+ * @fp: ptr to the FC frame
+ * @xid: input xid
*
* if xid is supplied zero then assign next free exchange ID
* from exchange manager, otherwise use supplied xid.
* Returns with exch lock held.
*/
-struct fc_exch *fc_exch_alloc(struct fc_exch_mgr *mp,
- struct fc_frame *fp, u16 xid)
+static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport,
+ struct fc_exch_mgr *mp,
+ struct fc_frame *fp, u16 xid)
{
struct fc_exch *ep;
*/
ep->oxid = ep->xid = xid;
ep->em = mp;
- ep->lp = mp->lp;
+ ep->lp = lport;
ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */
ep->rxid = FC_XID_UNKNOWN;
ep->class = mp->class;
mempool_free(ep, mp->ep_pool);
return NULL;
}
+
+/**
+ * fc_exch_alloc() - allocate an exchange.
+ * @lport: ptr to the local port
+ * @fp: ptr to the FC frame
+ *
+ * This function walks the list of the exchange manager(EM)
+ * anchors to select a EM for new exchange allocation. The
+ * EM is selected having either a NULL match function pointer
+ * or call to match function returning true.
+ */
+struct fc_exch *fc_exch_alloc(struct fc_lport *lport, struct fc_frame *fp)
+{
+ struct fc_exch_mgr_anchor *ema;
+ struct fc_exch *ep;
+
+ list_for_each_entry(ema, &lport->ema_list, ema_list) {
+ if (!ema->match || ema->match(fp)) {
+ ep = fc_exch_em_alloc(lport, ema->mp, fp, 0);
+ if (ep)
+ return ep;
+ }
+ }
+ return NULL;
+}
EXPORT_SYMBOL(fc_exch_alloc);
/*
* Allocate a new exchange as responder.
* Sets the responder ID in the frame header.
*/
-static struct fc_exch *fc_exch_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
+static struct fc_exch *fc_exch_resp(struct fc_lport *lport,
+ struct fc_exch_mgr *mp,
+ struct fc_frame *fp)
{
struct fc_exch *ep;
struct fc_frame_header *fh;
- ep = mp->lp->tt.exch_get(mp->lp, fp);
+ ep = fc_exch_alloc(lport, fp);
if (ep) {
ep->class = fc_frame_class(fp);
ep->esb_stat &= ~ESB_ST_SEQ_INIT;
fc_exch_hold(ep); /* hold for caller */
- spin_unlock_bh(&ep->ex_lock); /* lock from exch_get */
+ spin_unlock_bh(&ep->ex_lock); /* lock from fc_exch_alloc */
}
return ep;
}
* If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold
* on the ep that should be released by the caller.
*/
-static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_exch_mgr *mp,
+static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport,
+ struct fc_exch_mgr *mp,
struct fc_frame *fp)
{
struct fc_frame_header *fh = fc_frame_header_get(fp);
reject = FC_RJT_RX_ID;
goto rel;
}
- ep = fc_exch_resp(mp, fp);
+ ep = fc_exch_resp(lport, mp, fp);
if (!ep) {
reject = FC_RJT_EXCH_EST; /* XXX */
goto out;
enum fc_pf_rjt_reason reject;
fr_seq(fp) = NULL;
- reject = fc_seq_lookup_recip(mp, fp);
+ reject = fc_seq_lookup_recip(lp, mp, fp);
if (reject == FC_RJT_NONE) {
sp = fr_seq(fp); /* sequence will be held */
ep = fc_seq_exch(sp);
{
struct fc_exch *ep;
struct fc_exch *next;
- struct fc_exch_mgr *mp = lp->emp;
+ struct fc_exch_mgr *mp;
+ struct fc_exch_mgr_anchor *ema;
- spin_lock_bh(&mp->em_lock);
+ list_for_each_entry(ema, &lp->ema_list, ema_list) {
+ mp = ema->mp;
+ spin_lock_bh(&mp->em_lock);
restart:
- list_for_each_entry_safe(ep, next, &mp->ex_list, ex_list) {
- if ((sid == 0 || sid == ep->sid) &&
- (did == 0 || did == ep->did)) {
- fc_exch_hold(ep);
- spin_unlock_bh(&mp->em_lock);
-
- fc_exch_reset(ep);
-
- fc_exch_release(ep);
- spin_lock_bh(&mp->em_lock);
-
- /*
- * must restart loop incase while lock was down
- * multiple eps were released.
- */
- goto restart;
+ list_for_each_entry_safe(ep, next, &mp->ex_list, ex_list) {
+ if ((lp == ep->lp) &&
+ (sid == 0 || sid == ep->sid) &&
+ (did == 0 || did == ep->did)) {
+ fc_exch_hold(ep);
+ spin_unlock_bh(&mp->em_lock);
+
+ fc_exch_reset(ep);
+
+ fc_exch_release(ep);
+ spin_lock_bh(&mp->em_lock);
+
+ /*
+ * must restart loop incase while lock
+ * was down multiple eps were released.
+ */
+ goto restart;
+ }
}
+ spin_unlock_bh(&mp->em_lock);
}
- spin_unlock_bh(&mp->em_lock);
}
EXPORT_SYMBOL(fc_exch_mgr_reset);
struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp,
enum fc_class class,
- u16 min_xid, u16 max_xid)
+ u16 min_xid, u16 max_xid,
+ bool (*match)(struct fc_frame *))
{
struct fc_exch_mgr *mp;
size_t len;
mp->class = class;
mp->total_exches = 0;
mp->exches = (struct fc_exch **)(mp + 1);
- mp->lp = lp;
/* adjust em exch xid range for offload */
mp->min_xid = min_xid;
mp->max_xid = max_xid;
if (!mp->ep_pool)
goto free_mp;
+ kref_init(&mp->kref);
+ if (!fc_exch_mgr_add(lp, mp, match)) {
+ mempool_destroy(mp->ep_pool);
+ goto free_mp;
+ }
+
+ /*
+ * Above kref_init() sets mp->kref to 1 and then
+ * call to fc_exch_mgr_add incremented mp->kref again,
+ * so adjust that extra increment.
+ */
+ kref_put(&mp->kref, fc_exch_mgr_destroy);
return mp;
free_mp:
}
EXPORT_SYMBOL(fc_exch_mgr_alloc);
-void fc_exch_mgr_free(struct fc_exch_mgr *mp)
+void fc_exch_mgr_free(struct fc_lport *lport)
{
- WARN_ON(!mp);
- /*
- * The total exch count must be zero
- * before freeing exchange manager.
- */
- WARN_ON(mp->total_exches != 0);
- mempool_destroy(mp->ep_pool);
- kfree(mp);
+ struct fc_exch_mgr_anchor *ema, *next;
+
+ list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list)
+ fc_exch_mgr_del(ema);
}
EXPORT_SYMBOL(fc_exch_mgr_free);
-struct fc_exch *fc_exch_get(struct fc_lport *lp, struct fc_frame *fp)
-{
- if (!lp || !lp->emp)
- return NULL;
-
- return fc_exch_alloc(lp->emp, fp, 0);
-}
-EXPORT_SYMBOL(fc_exch_get);
struct fc_seq *fc_exch_seq_send(struct fc_lport *lp,
struct fc_frame *fp,
struct fc_frame_header *fh;
int rc = 1;
- ep = lp->tt.exch_get(lp, fp);
+ ep = fc_exch_alloc(lp, fp);
if (!ep) {
fc_frame_free(fp);
return NULL;
/*
* Receive a frame
*/
-void fc_exch_recv(struct fc_lport *lp, struct fc_exch_mgr *mp,
- struct fc_frame *fp)
+void fc_exch_recv(struct fc_lport *lp, struct fc_frame *fp)
{
struct fc_frame_header *fh = fc_frame_header_get(fp);
- u32 f_ctl;
+ struct fc_exch_mgr_anchor *ema;
+ u32 f_ctl, found = 0;
+ u16 oxid;
/* lport lock ? */
- if (!lp || !mp || lp->state == LPORT_ST_DISABLED) {
+ if (!lp || lp->state == LPORT_ST_DISABLED) {
FC_LPORT_DBG(lp, "Receiving frames for an lport that "
"has not been initialized correctly\n");
fc_frame_free(fp);
return;
}
+ f_ctl = ntoh24(fh->fh_f_ctl);
+ oxid = ntohs(fh->fh_ox_id);
+ if (f_ctl & FC_FC_EX_CTX) {
+ list_for_each_entry(ema, &lp->ema_list, ema_list) {
+ if ((oxid >= ema->mp->min_xid) &&
+ (oxid <= ema->mp->max_xid)) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found) {
+ FC_LPORT_DBG(lp, "Received response for out "
+ "of range oxid:%hx\n", oxid);
+ fc_frame_free(fp);
+ return;
+ }
+ } else
+ ema = list_entry(lp->ema_list.prev, typeof(*ema), ema_list);
+
/*
* If frame is marked invalid, just drop it.
*/
- f_ctl = ntoh24(fh->fh_f_ctl);
switch (fr_eof(fp)) {
case FC_EOF_T:
if (f_ctl & FC_FC_END_SEQ)
/* fall through */
case FC_EOF_N:
if (fh->fh_type == FC_TYPE_BLS)
- fc_exch_recv_bls(mp, fp);
+ fc_exch_recv_bls(ema->mp, fp);
else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) ==
FC_FC_EX_CTX)
- fc_exch_recv_seq_resp(mp, fp);
+ fc_exch_recv_seq_resp(ema->mp, fp);
else if (f_ctl & FC_FC_SEQ_CTX)
- fc_exch_recv_resp(mp, fp);
+ fc_exch_recv_resp(ema->mp, fp);
else
- fc_exch_recv_req(lp, mp, fp);
+ fc_exch_recv_req(lp, ema->mp, fp);
break;
default:
FC_LPORT_DBG(lp, "dropping invalid frame (eof %x)", fr_eof(fp));
fc_frame_free(fp);
- break;
}
}
EXPORT_SYMBOL(fc_exch_recv);
int fc_exch_init(struct fc_lport *lp)
{
- if (!lp->tt.exch_get) {
- /*
- * exch_put() should be NULL if
- * exch_get() is NULL
- */
- WARN_ON(lp->tt.exch_put);
- lp->tt.exch_get = fc_exch_get;
- }
-
if (!lp->tt.seq_start_next)
lp->tt.seq_start_next = fc_seq_start_next;
void (*exch_done)(struct fc_seq *sp);
/*
- * Assigns a EM and a free XID for an new exchange and then
- * allocates a new exchange and sequence pair.
- * The fp can be used to determine free XID.
- *
- * STATUS: OPTIONAL
- */
- struct fc_exch *(*exch_get)(struct fc_lport *lp, struct fc_frame *fp);
-
- /*
- * Release previously assigned XID by exch_get API.
- * The LLD may implement this if XID is assigned by LLD
- * in exch_get().
- *
- * STATUS: OPTIONAL
- */
- void (*exch_put)(struct fc_lport *lp, struct fc_exch_mgr *mp,
- u16 ex_id);
-
- /*
* Start a new sequence on the same exchange/sequence tuple.
*
* STATUS: OPTIONAL
/* Associations */
struct Scsi_Host *host;
- struct fc_exch_mgr *emp;
struct list_head ema_list;
struct fc_rport *dns_rp;
struct fc_rport *ptp_rp;
* a new exchange.
* The LLD may choose to have multiple EMs,
* e.g. one EM instance per CPU receive thread in LLD.
- * The LLD can use exch_get() of struct libfc_function_template
- * to specify XID for a new exchange within
- * a specified EM instance.
*
- * The em_idx to uniquely identify an EM instance.
+ * Specified match function is used in allocating exchanges
+ * from newly allocated EM.
*/
struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp,
enum fc_class class,
u16 min_xid,
- u16 max_xid);
+ u16 max_xid,
+ bool (*match)(struct fc_frame *));
/*
- * Free an exchange manager.
+ * Free all exchange managers of a lport.
*/
-void fc_exch_mgr_free(struct fc_exch_mgr *mp);
+void fc_exch_mgr_free(struct fc_lport *lport);
/*
* Receive a frame on specified local port and exchange manager.
*/
-void fc_exch_recv(struct fc_lport *lp, struct fc_exch_mgr *mp,
- struct fc_frame *fp);
+void fc_exch_recv(struct fc_lport *lp, struct fc_frame *fp);
/*
* This function is for exch_seq_send function pointer in
void fc_exch_done(struct fc_seq *sp);
/*
- * Assigns a EM and XID for a frame and then allocates
- * a new exchange and sequence pair.
- * The fp can be used to determine free XID.
- */
-struct fc_exch *fc_exch_get(struct fc_lport *lp, struct fc_frame *fp);
-
-/*
* Allocate a new exchange and sequence pair.
- * if ex_id is zero then next free exchange id
- * from specified exchange manger mp will be assigned.
*/
-struct fc_exch *fc_exch_alloc(struct fc_exch_mgr *mp,
- struct fc_frame *fp, u16 ex_id);
+struct fc_exch *fc_exch_alloc(struct fc_lport *lport, struct fc_frame *fp);
/*
* Start a new sequence on the same exchange as the supplied sequence.
*/
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff