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authorLinus Torvalds <torvalds@linux-foundation.org>2009-04-02 21:05:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-02 21:05:30 -0700
commitef8a97bbc92ec07e3a07a81cc011dc549f8c7a23 (patch)
tree82a95f16d9236bc35a4cfd42ba8cab61981efda8 /net/rds/iw_recv.c
parent4f032ac4122a77dbabf7a24b2739b2790448180f (diff)
parent6c8ad3b07f7d9efdc41396db6da0aed906922701 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (54 commits) glge: remove unused #include <version.h> dnet: remove unused #include <version.h> tcp: miscounts due to tcp_fragment pcount reset tcp: add helper for counter tweaking due mid-wq change hso: fix for the 'invalid frame length' messages hso: fix for crash when unplugging the device fsl_pq_mdio: Fix compile failure fsl_pq_mdio: Revive UCC MDIO support ucc_geth: Pass proper device to DMA routines, otherwise oops happens i.MX31: Fixing cs89x0 network building to i.MX31ADS tc35815: Fix build error if NAPI enabled hso: add Vendor/Product ID's for new devices ucc_geth: Remove unused header gianfar: Remove unused header kaweth: Fix locking to be SMP-safe net: allow multiple dev per napi with GRO r8169: reset IntrStatus after chip reset ixgbe: Fix potential memory leak/driver panic issue while setting up Tx & Rx ring parameters ixgbe: fix ethtool -A|a behavior ixgbe: Patch to fix driver panic while freeing up tx & rx resources ...
Diffstat (limited to 'net/rds/iw_recv.c')
-rw-r--r--net/rds/iw_recv.c37
1 files changed, 35 insertions, 2 deletions
diff --git a/net/rds/iw_recv.c b/net/rds/iw_recv.c
index a1931f0027a2..fde470fa50d5 100644
--- a/net/rds/iw_recv.c
+++ b/net/rds/iw_recv.c
@@ -395,10 +395,37 @@ void rds_iw_recv_init_ack(struct rds_iw_connection *ic)
* room for it beyond the ring size. Send completion notices its special
* wr_id and avoids working with the ring in that case.
*/
+#ifndef KERNEL_HAS_ATOMIC64
static void rds_iw_set_ack(struct rds_iw_connection *ic, u64 seq,
int ack_required)
{
- rds_iw_set_64bit(&ic->i_ack_next, seq);
+ unsigned long flags;
+
+ spin_lock_irqsave(&ic->i_ack_lock, flags);
+ ic->i_ack_next = seq;
+ if (ack_required)
+ set_bit(IB_ACK_REQUESTED, &ic->i_ack_flags);
+ spin_unlock_irqrestore(&ic->i_ack_lock, flags);
+}
+
+static u64 rds_iw_get_ack(struct rds_iw_connection *ic)
+{
+ unsigned long flags;
+ u64 seq;
+
+ clear_bit(IB_ACK_REQUESTED, &ic->i_ack_flags);
+
+ spin_lock_irqsave(&ic->i_ack_lock, flags);
+ seq = ic->i_ack_next;
+ spin_unlock_irqrestore(&ic->i_ack_lock, flags);
+
+ return seq;
+}
+#else
+static void rds_iw_set_ack(struct rds_iw_connection *ic, u64 seq,
+ int ack_required)
+{
+ atomic64_set(&ic->i_ack_next, seq);
if (ack_required) {
smp_mb__before_clear_bit();
set_bit(IB_ACK_REQUESTED, &ic->i_ack_flags);
@@ -410,8 +437,10 @@ static u64 rds_iw_get_ack(struct rds_iw_connection *ic)
clear_bit(IB_ACK_REQUESTED, &ic->i_ack_flags);
smp_mb__after_clear_bit();
- return ic->i_ack_next;
+ return atomic64_read(&ic->i_ack_next);
}
+#endif
+
static void rds_iw_send_ack(struct rds_iw_connection *ic, unsigned int adv_credits)
{
@@ -464,6 +493,10 @@ static void rds_iw_send_ack(struct rds_iw_connection *ic, unsigned int adv_credi
* - i_ack_next, which is the last sequence number we received
*
* Potentially, send queue and receive queue handlers can run concurrently.
+ * It would be nice to not have to use a spinlock to synchronize things,
+ * but the one problem that rules this out is that 64bit updates are
+ * not atomic on all platforms. Things would be a lot simpler if
+ * we had atomic64 or maybe cmpxchg64 everywhere.
*
* Reconnecting complicates this picture just slightly. When we
* reconnect, we may be seeing duplicate packets. The peer