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authorUrsula Braun <ubraun@linux.ibm.com>2018-11-20 18:46:42 +0300
committerDavid S. Miller <davem@davemloft.net>2018-11-22 03:14:56 +0300
commitb9a22dd9811dbcddb5623c499e5b736400059df6 (patch)
treeaa6958e351f6bee0593326693fca2878ae14c6e6 /net/smc/smc_cdc.h
parent0512f69e388c963dbe955d4bd9ae0f7d88d2dc54 (diff)
downloadlinux-b9a22dd9811dbcddb5623c499e5b736400059df6.tar.xz
net/smc: atomic SMCD cursor handling
Running uperf tests with SMCD on LPARs results in corrupted cursors. SMCD cursors should be treated atomically to fix cursor corruption. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/smc/smc_cdc.h')
-rw-r--r--net/smc/smc_cdc.h60
1 files changed, 45 insertions, 15 deletions
diff --git a/net/smc/smc_cdc.h b/net/smc/smc_cdc.h
index 934df4473a7c..b5bfe38c7f9b 100644
--- a/net/smc/smc_cdc.h
+++ b/net/smc/smc_cdc.h
@@ -48,21 +48,31 @@ struct smc_cdc_msg {
struct smc_cdc_producer_flags prod_flags;
struct smc_cdc_conn_state_flags conn_state_flags;
u8 reserved[18];
-} __packed; /* format defined in RFC7609 */
+};
+
+/* SMC-D cursor format */
+union smcd_cdc_cursor {
+ struct {
+ u16 wrap;
+ u32 count;
+ struct smc_cdc_producer_flags prod_flags;
+ struct smc_cdc_conn_state_flags conn_state_flags;
+ } __packed;
+#ifdef KERNEL_HAS_ATOMIC64
+ atomic64_t acurs; /* for atomic processing */
+#else
+ u64 acurs; /* for atomic processing */
+#endif
+} __aligned(8);
/* CDC message for SMC-D */
struct smcd_cdc_msg {
struct smc_wr_rx_hdr common; /* Type = 0xFE */
u8 res1[7];
- u16 prod_wrap;
- u32 prod_count;
- u8 res2[2];
- u16 cons_wrap;
- u32 cons_count;
- struct smc_cdc_producer_flags prod_flags;
- struct smc_cdc_conn_state_flags conn_state_flags;
+ union smcd_cdc_cursor prod;
+ union smcd_cdc_cursor cons;
u8 res3[8];
-} __packed;
+} __aligned(8);
static inline bool smc_cdc_rxed_any_close(struct smc_connection *conn)
{
@@ -135,6 +145,21 @@ static inline void smc_curs_copy_net(union smc_cdc_cursor *tgt,
#endif
}
+static inline void smcd_curs_copy(union smcd_cdc_cursor *tgt,
+ union smcd_cdc_cursor *src,
+ struct smc_connection *conn)
+{
+#ifndef KERNEL_HAS_ATOMIC64
+ unsigned long flags;
+
+ spin_lock_irqsave(&conn->acurs_lock, flags);
+ tgt->acurs = src->acurs;
+ spin_unlock_irqrestore(&conn->acurs_lock, flags);
+#else
+ atomic64_set(&tgt->acurs, atomic64_read(&src->acurs));
+#endif
+}
+
/* calculate cursor difference between old and new, where old <= new */
static inline int smc_curs_diff(unsigned int size,
union smc_host_cursor *old,
@@ -222,12 +247,17 @@ static inline void smcr_cdc_msg_to_host(struct smc_host_cdc_msg *local,
static inline void smcd_cdc_msg_to_host(struct smc_host_cdc_msg *local,
struct smcd_cdc_msg *peer)
{
- local->prod.wrap = peer->prod_wrap;
- local->prod.count = peer->prod_count;
- local->cons.wrap = peer->cons_wrap;
- local->cons.count = peer->cons_count;
- local->prod_flags = peer->prod_flags;
- local->conn_state_flags = peer->conn_state_flags;
+ union smc_host_cursor temp;
+
+ temp.wrap = peer->prod.wrap;
+ temp.count = peer->prod.count;
+ atomic64_set(&local->prod.acurs, atomic64_read(&temp.acurs));
+
+ temp.wrap = peer->cons.wrap;
+ temp.count = peer->cons.count;
+ atomic64_set(&local->cons.acurs, atomic64_read(&temp.acurs));
+ local->prod_flags = peer->cons.prod_flags;
+ local->conn_state_flags = peer->cons.conn_state_flags;
}
static inline void smc_cdc_msg_to_host(struct smc_host_cdc_msg *local,