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Message-Id: <20080922.191245.120692142.davem@davemloft.net>
Date: Mon, 22 Sep 2008 19:12:45 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: netdev@...r.kernel.org
Subject: [PATCH 7/7]: cxgb3: Use SKB list interfaces instead of home-grown
implementation.
cxgb3: Use SKB list interfaces instead of home-grown implementation.
Signed-off-by: David S. Miller <davem@...emloft.net>
---
drivers/net/cxgb3/adapter.h | 3 +-
drivers/net/cxgb3/l2t.c | 39 ++++++++++++++++---------------------
drivers/net/cxgb3/l2t.h | 3 +-
drivers/net/cxgb3/sge.c | 45 ++++++++++++++++++++++---------------------
4 files changed, 42 insertions(+), 48 deletions(-)
diff --git a/drivers/net/cxgb3/adapter.h b/drivers/net/cxgb3/adapter.h
index 2711404..4f5cc69 100644
--- a/drivers/net/cxgb3/adapter.h
+++ b/drivers/net/cxgb3/adapter.h
@@ -124,8 +124,7 @@ struct sge_rspq { /* state for an SGE response queue */
dma_addr_t phys_addr; /* physical address of the ring */
unsigned int cntxt_id; /* SGE context id for the response q */
spinlock_t lock; /* guards response processing */
- struct sk_buff *rx_head; /* offload packet receive queue head */
- struct sk_buff *rx_tail; /* offload packet receive queue tail */
+ struct sk_buff_head rx_queue; /* offload packet receive queue */
struct sk_buff *pg_skb; /* used to build frag list in napi handler */
unsigned long offload_pkts;
diff --git a/drivers/net/cxgb3/l2t.c b/drivers/net/cxgb3/l2t.c
index 825e510..b2c5314 100644
--- a/drivers/net/cxgb3/l2t.c
+++ b/drivers/net/cxgb3/l2t.c
@@ -86,6 +86,7 @@ static int setup_l2e_send_pending(struct t3cdev *dev, struct sk_buff *skb,
struct l2t_entry *e)
{
struct cpl_l2t_write_req *req;
+ struct sk_buff *tmp;
if (!skb) {
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));
skb->priority = CPL_PRIORITY_CONTROL;
cxgb3_ofld_send(dev, skb);
- while (e->arpq_head) {
- skb = e->arpq_head;
- e->arpq_head = skb->next;
- skb->next = NULL;
+
+ skb_queue_walk_safe(&e->arpq, skb, tmp) {
+ __skb_unlink(skb, &e->arpq);
cxgb3_ofld_send(dev, skb);
}
- e->arpq_tail = NULL;
e->state = L2T_STATE_VALID;
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)
{
- skb->next = NULL;
- if (e->arpq_head)
- e->arpq_tail->next = skb;
- else
- e->arpq_head = skb;
- e->arpq_tail = skb;
+ __skb_queue_tail(&e->arpq, skb);
}
int t3_l2t_send_slow(struct t3cdev *dev, struct sk_buff *skb,
@@ -167,7 +161,7 @@ again:
break;
spin_lock_bh(&e->lock);
- if (e->arpq_head)
+ if (!skb_queue_empty(&e->arpq))
setup_l2e_send_pending(dev, skb, e);
else /* we lost the race */
__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
* 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 = arpq;
+ struct sk_buff *skb, *tmp;
+
+ skb_queue_walk_safe(arpq, skb, tmp) {
struct l2t_skb_cb *cb = L2T_SKB_CB(skb);
- arpq = skb->next;
- skb->next = NULL;
+ __skb_unlink(skb, arpq);
if (cb->arp_failure_handler)
cb->arp_failure_handler(dev, skb);
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)
{
+ struct sk_buff_head arpq;
struct l2t_entry *e;
- struct sk_buff *arpq = NULL;
struct l2t_data *d = L2DATA(dev);
u32 addr = *(u32 *) neigh->primary_key;
int ifidx = neigh->dev->ifindex;
@@ -395,6 +389,8 @@ void t3_l2t_update(struct t3cdev *dev, struct neighbour *neigh)
return;
found:
+ __skb_queue_head_init(&arpq);
+
read_unlock(&d->lock);
if (atomic_read(&e->refcnt)) {
if (neigh != e->neigh)
@@ -402,8 +398,7 @@ found:
if (e->state == L2T_STATE_RESOLVING) {
if (neigh->nud_state & NUD_FAILED) {
- arpq = e->arpq_head;
- e->arpq_head = e->arpq_tail = NULL;
+ skb_queue_splice_init(&e->arpq, &arpq);
} else if (neigh->nud_state & (NUD_CONNECTED|NUD_STALE))
setup_l2e_send_pending(dev, NULL, e);
} else {
@@ -415,8 +410,8 @@ found:
}
spin_unlock_bh(&e->lock);
- if (arpq)
- handle_failed_resolution(dev, arpq);
+ if (!skb_queue_empty(&arpq))
+ handle_failed_resolution(dev, &arpq);
}
struct l2t_data *t3_init_l2t(unsigned int l2t_capacity)
diff --git a/drivers/net/cxgb3/l2t.h b/drivers/net/cxgb3/l2t.h
index d790013..42ce65f 100644
--- a/drivers/net/cxgb3/l2t.h
+++ b/drivers/net/cxgb3/l2t.h
@@ -64,8 +64,7 @@ struct l2t_entry {
struct neighbour *neigh; /* associated neighbour */
struct l2t_entry *first; /* start of hash chain */
struct l2t_entry *next; /* next l2t_entry on chain */
- struct sk_buff *arpq_head; /* queue of packets awaiting resolution */
- struct sk_buff *arpq_tail;
+ struct sk_buff_head arpq; /* queue of packets awaiting resolution */
spinlock_t lock;
atomic_t refcnt; /* entry reference count */
u8 dmac[6]; /* neighbour's MAC address */
diff --git a/drivers/net/cxgb3/sge.c b/drivers/net/cxgb3/sge.c
index 1b0861d..6990c0d 100644
--- a/drivers/net/cxgb3/sge.c
+++ b/drivers/net/cxgb3/sge.c
@@ -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)
{
- skb->next = skb->prev = NULL;
- if (q->rx_tail)
- q->rx_tail->next = skb;
- else {
+ int was_empty = skb_queue_empty(&q->rx_queue);
+
+ __skb_queue_tail(&q->rx_queue, skb);
+
+ if (was_empty) {
struct sge_qset *qs = rspq_to_qset(q);
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;
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;
spin_lock_irq(&q->lock);
- head = q->rx_head;
- if (!head) {
+ __skb_queue_head_init(&queue);
+ skb_queue_splice_init(&q->rx_queue, &queue);
+ if (skb_queue_empty(&queue)) {
napi_complete(napi);
spin_unlock_irq(&q->lock);
return work_done;
}
-
- tail = q->rx_tail;
- q->rx_head = q->rx_tail = NULL;
spin_unlock_irq(&q->lock);
- for (ngathered = 0; work_done < budget && head; work_done++) {
- prefetch(head->data);
- skbs[ngathered] = head;
- head = head->next;
- skbs[ngathered]->next = NULL;
+ ngathered = 0;
+ skb_queue_walk_safe(&queue, skb, tmp) {
+ if (work_done >= budget)
+ break;
+ work_done++;
+
+ __skb_unlink(skb, &queue);
+ prefetch(skb->data);
+ skbs[ngathered] = skb;
if (++ngathered == RX_BUNDLE_SIZE) {
q->offload_bundles++;
adapter->tdev.recv(&adapter->tdev, skbs,
@@ -1781,12 +1783,10 @@ static int ofld_poll(struct napi_struct *napi, int budget)
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);
- tail->next = q->rx_head;
- if (!q->rx_head)
- q->rx_tail = tail;
- q->rx_head = head;
+ skb_queue_splice(&queue, &q->rx_queue);
spin_unlock_irq(&q->lock);
}
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.size = p->rspq_size;
spin_lock_init(&q->rspq.lock);
+ skb_queue_head_init(&q->rspq.rx_queue);
q->txq[TXQ_ETH].stop_thres = nports *
flits_to_desc(sgl_len(MAX_SKB_FRAGS + 1) + 3);
--
1.5.6.5
--
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