[PATCH net-next] gro_cells: remove spinlock protecting receive queues

[Eric Dumazet]

From: Eric Dumazet <eduma...@google.com>

As David pointed out, spinlock are no longer needed
to protect the per cpu queues used in gro cells infrastructure.

Also use new napi_complete_done() API so that gro_flush_timeout
tweaks have an effect.

Signed-off-by: Eric Dumazet <eduma...@google.com>
---
 include/net/gro_cells.h |   18 +++++-------------
 1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/include/net/gro_cells.h b/include/net/gro_cells.h
index 0f712c0..cf6c745 100644
--- a/include/net/gro_cells.h
+++ b/include/net/gro_cells.h
@@ -32,37 +32,28 @@ static inline void gro_cells_receive(struct gro_cells 
*gcells, struct sk_buff *s
                return;
        }
 
-       /* We run in BH context */
-       spin_lock(&cell->napi_skbs.lock);
-
        __skb_queue_tail(&cell->napi_skbs, skb);
        if (skb_queue_len(&cell->napi_skbs) == 1)
                napi_schedule(&cell->napi);
-
-       spin_unlock(&cell->napi_skbs.lock);
 }
 
-/* called unser BH context */
+/* called under BH context */
 static inline int gro_cell_poll(struct napi_struct *napi, int budget)
 {
        struct gro_cell *cell = container_of(napi, struct gro_cell, napi);
        struct sk_buff *skb;
        int work_done = 0;
 
-       spin_lock(&cell->napi_skbs.lock);
        while (work_done < budget) {
                skb = __skb_dequeue(&cell->napi_skbs);
                if (!skb)
                        break;
-               spin_unlock(&cell->napi_skbs.lock);
                napi_gro_receive(napi, skb);
                work_done++;
-               spin_lock(&cell->napi_skbs.lock);
        }
 
        if (work_done < budget)
-               napi_complete(napi);
-       spin_unlock(&cell->napi_skbs.lock);
+               napi_complete_done(napi, work_done);
        return work_done;
 }
 
@@ -77,7 +68,7 @@ static inline int gro_cells_init(struct gro_cells *gcells, 
struct net_device *de
        for_each_possible_cpu(i) {
                struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);
 
-               skb_queue_head_init(&cell->napi_skbs);
+               __skb_queue_head_init(&cell->napi_skbs);
                netif_napi_add(dev, &cell->napi, gro_cell_poll, 64);
                napi_enable(&cell->napi);
        }
@@ -92,8 +83,9 @@ static inline void gro_cells_destroy(struct gro_cells *gcells)
                return;
        for_each_possible_cpu(i) {
                struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);
+
                netif_napi_del(&cell->napi);
-               skb_queue_purge(&cell->napi_skbs);
+               __skb_queue_purge(&cell->napi_skbs);
        }
        free_percpu(gcells->cells);
        gcells->cells = NULL;


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html