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cxgb3: Use SKB list interfaces instead of home-grown implementation.

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Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-09-22 01:29:52 -07:00
parent 38783e6713
commit 147e70e62f
4 changed files with 42 additions and 48 deletions
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3
drivers/net/cxgb3/adapter.h
View file

@ -124,8 +124,7 @@ struct sge_rspq { /* state for an SGE response queue */
dma_addr_t phys_addr; /* physical address of the ring */ dma_addr_t phys_addr; /* physical address of the ring */
unsigned int cntxt_id; /* SGE context id for the response q */ unsigned int cntxt_id; /* SGE context id for the response q */
spinlock_t lock; /* guards response processing */ spinlock_t lock; /* guards response processing */
struct sk_buff *rx_head; /* offload packet receive queue head */ struct sk_buff_head rx_queue; /* offload packet receive queue */
struct sk_buff *rx_tail; /* offload packet receive queue tail */
struct sk_buff *pg_skb; /* used to build frag list in napi handler */ struct sk_buff *pg_skb; /* used to build frag list in napi handler */
unsigned long offload_pkts; unsigned long offload_pkts;

39
drivers/net/cxgb3/l2t.c
View file

@ -86,6 +86,7 @@ static int setup_l2e_send_pending(struct t3cdev *dev, struct sk_buff *skb,
struct l2t_entry *e) struct l2t_entry *e)
{ {
struct cpl_l2t_write_req *req; struct cpl_l2t_write_req *req;
struct sk_buff *tmp;
if (!skb) { if (!skb) {
skb = alloc_skb(sizeof(*req), GFP_ATOMIC); skb = alloc_skb(sizeof(*req), GFP_ATOMIC);
@ -103,13 +104,11 @@ static int setup_l2e_send_pending(struct t3cdev *dev, struct sk_buff *skb,
memcpy(req->dst_mac, e->dmac, sizeof(req->dst_mac)); memcpy(req->dst_mac, e->dmac, sizeof(req->dst_mac));
skb->priority = CPL_PRIORITY_CONTROL; skb->priority = CPL_PRIORITY_CONTROL;
cxgb3_ofld_send(dev, skb); cxgb3_ofld_send(dev, skb);
while (e->arpq_head) {
skb = e->arpq_head; skb_queue_walk_safe(&e->arpq, skb, tmp) {
e->arpq_head = skb->next; __skb_unlink(skb, &e->arpq);
skb->next = NULL;
cxgb3_ofld_send(dev, skb); cxgb3_ofld_send(dev, skb);
} }
e->arpq_tail = NULL;
e->state = L2T_STATE_VALID; e->state = L2T_STATE_VALID;
return 0; return 0;
@ -121,12 +120,7 @@ static int setup_l2e_send_pending(struct t3cdev *dev, struct sk_buff *skb,
*/ */
static inline void arpq_enqueue(struct l2t_entry *e, struct sk_buff *skb) static inline void arpq_enqueue(struct l2t_entry *e, struct sk_buff *skb)
{ {
skb->next = NULL; __skb_queue_tail(&e->arpq, skb);
if (e->arpq_head)
e->arpq_tail->next = skb;
else
e->arpq_head = skb;
e->arpq_tail = skb;
} }
int t3_l2t_send_slow(struct t3cdev *dev, struct sk_buff *skb, int t3_l2t_send_slow(struct t3cdev *dev, struct sk_buff *skb,
@ -167,7 +161,7 @@ int t3_l2t_send_slow(struct t3cdev *dev, struct sk_buff *skb,
break; break;
spin_lock_bh(&e->lock); spin_lock_bh(&e->lock);
if (e->arpq_head) if (!skb_queue_empty(&e->arpq))
setup_l2e_send_pending(dev, skb, e); setup_l2e_send_pending(dev, skb, e);
else /* we lost the race */ else /* we lost the race */
__kfree_skb(skb); __kfree_skb(skb);
@ -357,14 +351,14 @@ EXPORT_SYMBOL(t3_l2t_get);
* XXX: maybe we should abandon the latter behavior and just require a failure * XXX: maybe we should abandon the latter behavior and just require a failure
* handler. * handler.
*/ */
static void handle_failed_resolution(struct t3cdev *dev, struct sk_buff *arpq) static void handle_failed_resolution(struct t3cdev *dev, struct sk_buff_head *arpq)
{ {
while (arpq) { struct sk_buff *skb, *tmp;
struct sk_buff *skb = arpq;
skb_queue_walk_safe(arpq, skb, tmp) {
struct l2t_skb_cb *cb = L2T_SKB_CB(skb); struct l2t_skb_cb *cb = L2T_SKB_CB(skb);
arpq = skb->next; __skb_unlink(skb, arpq);
skb->next = NULL;
if (cb->arp_failure_handler) if (cb->arp_failure_handler)
cb->arp_failure_handler(dev, skb); cb->arp_failure_handler(dev, skb);
else else
@ -378,8 +372,8 @@ static void handle_failed_resolution(struct t3cdev *dev, struct sk_buff *arpq)
*/ */
void t3_l2t_update(struct t3cdev *dev, struct neighbour *neigh) void t3_l2t_update(struct t3cdev *dev, struct neighbour *neigh)
{ {
struct sk_buff_head arpq;
struct l2t_entry *e; struct l2t_entry *e;
struct sk_buff *arpq = NULL;
struct l2t_data *d = L2DATA(dev); struct l2t_data *d = L2DATA(dev);
u32 addr = *(u32 *) neigh->primary_key; u32 addr = *(u32 *) neigh->primary_key;
int ifidx = neigh->dev->ifindex; int ifidx = neigh->dev->ifindex;
@ -395,6 +389,8 @@ void t3_l2t_update(struct t3cdev *dev, struct neighbour *neigh)
return; return;
found: found:
__skb_queue_head_init(&arpq);
read_unlock(&d->lock); read_unlock(&d->lock);
if (atomic_read(&e->refcnt)) { if (atomic_read(&e->refcnt)) {
if (neigh != e->neigh) if (neigh != e->neigh)
@ -402,8 +398,7 @@ void t3_l2t_update(struct t3cdev *dev, struct neighbour *neigh)
if (e->state == L2T_STATE_RESOLVING) { if (e->state == L2T_STATE_RESOLVING) {
if (neigh->nud_state & NUD_FAILED) { if (neigh->nud_state & NUD_FAILED) {
arpq = e->arpq_head; skb_queue_splice_init(&e->arpq, &arpq);
e->arpq_head = e->arpq_tail = NULL;
} else if (neigh->nud_state & (NUD_CONNECTED|NUD_STALE)) } else if (neigh->nud_state & (NUD_CONNECTED|NUD_STALE))
setup_l2e_send_pending(dev, NULL, e); setup_l2e_send_pending(dev, NULL, e);
} else { } else {
@ -415,8 +410,8 @@ void t3_l2t_update(struct t3cdev *dev, struct neighbour *neigh)
} }
spin_unlock_bh(&e->lock); spin_unlock_bh(&e->lock);
if (arpq) if (!skb_queue_empty(&arpq))
handle_failed_resolution(dev, arpq); handle_failed_resolution(dev, &arpq);
} }
struct l2t_data *t3_init_l2t(unsigned int l2t_capacity) struct l2t_data *t3_init_l2t(unsigned int l2t_capacity)

3
drivers/net/cxgb3/l2t.h
View file

@ -64,8 +64,7 @@ struct l2t_entry {
struct neighbour *neigh; /* associated neighbour */ struct neighbour *neigh; /* associated neighbour */
struct l2t_entry *first; /* start of hash chain */ struct l2t_entry *first; /* start of hash chain */
struct l2t_entry *next; /* next l2t_entry on chain */ struct l2t_entry *next; /* next l2t_entry on chain */
struct sk_buff *arpq_head; /* queue of packets awaiting resolution */ struct sk_buff_head arpq; /* queue of packets awaiting resolution */
struct sk_buff *arpq_tail;
spinlock_t lock; spinlock_t lock;
atomic_t refcnt; /* entry reference count */ atomic_t refcnt; /* entry reference count */
u8 dmac[6]; /* neighbour's MAC address */ u8 dmac[6]; /* neighbour's MAC address */

45
drivers/net/cxgb3/sge.c
View file

@ -1704,16 +1704,15 @@ int t3_offload_tx(struct t3cdev *tdev, struct sk_buff *skb)
*/ */
static inline void offload_enqueue(struct sge_rspq *q, struct sk_buff *skb) static inline void offload_enqueue(struct sge_rspq *q, struct sk_buff *skb)
{ {
skb->next = skb->prev = NULL; int was_empty = skb_queue_empty(&q->rx_queue);
if (q->rx_tail)
q->rx_tail->next = skb; __skb_queue_tail(&q->rx_queue, skb);
else {
if (was_empty) {
struct sge_qset *qs = rspq_to_qset(q); struct sge_qset *qs = rspq_to_qset(q);
napi_schedule(&qs->napi); napi_schedule(&qs->napi);
q->rx_head = skb;
} }
q->rx_tail = skb;
} }
/** /**
@ -1754,26 +1753,29 @@ static int ofld_poll(struct napi_struct *napi, int budget)
int work_done = 0; int work_done = 0;
while (work_done < budget) { while (work_done < budget) {
struct sk_buff *head, *tail, *skbs[RX_BUNDLE_SIZE]; struct sk_buff *skb, *tmp, *skbs[RX_BUNDLE_SIZE];
struct sk_buff_head queue;
int ngathered; int ngathered;
spin_lock_irq(&q->lock); spin_lock_irq(&q->lock);
head = q->rx_head; __skb_queue_head_init(&queue);
if (!head) { skb_queue_splice_init(&q->rx_queue, &queue);
if (skb_queue_empty(&queue)) {
napi_complete(napi); napi_complete(napi);
spin_unlock_irq(&q->lock); spin_unlock_irq(&q->lock);
return work_done; return work_done;
} }
tail = q->rx_tail;
q->rx_head = q->rx_tail = NULL;
spin_unlock_irq(&q->lock); spin_unlock_irq(&q->lock);
for (ngathered = 0; work_done < budget && head; work_done++) { ngathered = 0;
prefetch(head->data); skb_queue_walk_safe(&queue, skb, tmp) {
skbs[ngathered] = head; if (work_done >= budget)
head = head->next; break;
skbs[ngathered]->next = NULL; work_done++;
__skb_unlink(skb, &queue);
prefetch(skb->data);
skbs[ngathered] = skb;
if (++ngathered == RX_BUNDLE_SIZE) { if (++ngathered == RX_BUNDLE_SIZE) {
q->offload_bundles++; q->offload_bundles++;
adapter->tdev.recv(&adapter->tdev, skbs, adapter->tdev.recv(&adapter->tdev, skbs,
@ -1781,12 +1783,10 @@ static int ofld_poll(struct napi_struct *napi, int budget)
ngathered = 0; ngathered = 0;
} }
} }
if (head) { /* splice remaining packets back onto Rx queue */ if (!skb_queue_empty(&queue)) {
/* splice remaining packets back onto Rx queue */
spin_lock_irq(&q->lock); spin_lock_irq(&q->lock);
tail->next = q->rx_head; skb_queue_splice(&queue, &q->rx_queue);
if (!q->rx_head)
q->rx_tail = tail;
q->rx_head = head;
spin_unlock_irq(&q->lock); spin_unlock_irq(&q->lock);
} }
deliver_partial_bundle(&adapter->tdev, q, skbs, ngathered); deliver_partial_bundle(&adapter->tdev, q, skbs, ngathered);
@ -2934,6 +2934,7 @@ int t3_sge_alloc_qset(struct adapter *adapter, unsigned int id, int nports,
q->rspq.gen = 1; q->rspq.gen = 1;
q->rspq.size = p->rspq_size; q->rspq.size = p->rspq_size;
spin_lock_init(&q->rspq.lock); spin_lock_init(&q->rspq.lock);
skb_queue_head_init(&q->rspq.rx_queue);
q->txq[TXQ_ETH].stop_thres = nports * q->txq[TXQ_ETH].stop_thres = nports *
flits_to_desc(sgl_len(MAX_SKB_FRAGS + 1) + 3); flits_to_desc(sgl_len(MAX_SKB_FRAGS + 1) + 3);