RDMA/cxgb3: Shrink .text with compile-time init of handlers arrays

Using compile-time designated initializers for the handler arrays
instead of open-coding the initialization in iwch_cm_init() is (IMHO)
cleaner, and leads to substantially smaller code: on my x86-64 build,
bloat-o-meter shows:

add/remove: 0/1 grow/shrink: 4/3 up/down: 4/-1682 (-1678)
function                                     old     new   delta
tx_ack                                       167     168      +1
state_set                                     55      56      +1
start_ep_timer                                99     100      +1
pass_establish                               177     178      +1
act_open_req_arp_failure                      39      38      -1
sched                                         84      82      -2
iwch_cm_init                                 442      91    -351
work_handlers                               1328       -   -1328

Signed-off-by: Roland Dreier <rolandd@cisco.com>

2 files changed, 65 insertions, 66 deletions

diff --git a/drivers/infiniband/hw/cxgb3/iwch.c b/drivers/infiniband/hw/cxgb3/iwch.c
index 63f975f3e30f..8e77dc543dd1 100644
--- a/drivers/infiniband/hw/cxgb3/iwch.c
+++ b/drivers/infiniband/hw/cxgb3/iwch.c
@@ -47,8 +47,6 @@ MODULE_DESCRIPTION("Chelsio T3 RDMA Driver");
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_VERSION(DRV_VERSION);
 
-cxgb3_cpl_handler_func t3c_handlers[NUM_CPL_CMDS];
-
 static void open_rnic_dev(struct t3cdev *);
 static void close_rnic_dev(struct t3cdev *);
 static void iwch_event_handler(struct t3cdev *, u32, u32);
diff --git a/drivers/infiniband/hw/cxgb3/iwch_cm.c b/drivers/infiniband/hw/cxgb3/iwch_cm.c
index cfd6db019f1e..ebfb117ba68b 100644
--- a/drivers/infiniband/hw/cxgb3/iwch_cm.c
+++ b/drivers/infiniband/hw/cxgb3/iwch_cm.c
@@ -102,12 +102,9 @@ static unsigned int cong_flavor = 1;
 module_param(cong_flavor, uint, 0644);
 MODULE_PARM_DESC(cong_flavor, "TCP Congestion control flavor (default=1)");
 
-static void process_work(struct work_struct *work);
 static struct workqueue_struct *workq;
-static DECLARE_WORK(skb_work, process_work);
 
 static struct sk_buff_head rxq;
-static cxgb3_cpl_handler_func work_handlers[NUM_CPL_CMDS];
 
 static struct sk_buff *get_skb(struct sk_buff *skb, int len, gfp_t gfp);
 static void ep_timeout(unsigned long arg);
@@ -302,27 +299,6 @@ static void release_ep_resources(struct iwch_ep *ep)
         put_ep(&ep->com);
 }
 
-static void process_work(struct work_struct *work)
-{
-        struct sk_buff *skb = NULL;
-        void *ep;
-        struct t3cdev *tdev;
-        int ret;
-
-        while ((skb = skb_dequeue(&rxq))) {
-                ep = *((void **) (skb->cb));
-                tdev = *((struct t3cdev **) (skb->cb + sizeof(void *)));
-                ret = work_handlers[G_OPCODE(ntohl((__force __be32)skb->csum))](tdev, skb, ep);
-                if (ret & CPL_RET_BUF_DONE)
-                        kfree_skb(skb);
-
-                /*
-                 * ep was referenced in sched(), and is freed here.
-                 */
-                put_ep((struct iwch_ep_common *)ep);
-        }
-}
-
 static int status2errno(int status)
 {
         switch (status) {
@@ -2157,7 +2133,49 @@ int iwch_ep_redirect(void *ctx, struct dst_entry *old, struct dst_entry *new,
 
 /*
  * All the CM events are handled on a work queue to have a safe context.
+ * These are the real handlers that are called from the work queue.
  */
+static const cxgb3_cpl_handler_func work_handlers[NUM_CPL_CMDS] = {
+        [CPL_ACT_ESTABLISH]     = act_establish,
+        [CPL_ACT_OPEN_RPL]      = act_open_rpl,
+        [CPL_RX_DATA]           = rx_data,
+        [CPL_TX_DMA_ACK]        = tx_ack,
+        [CPL_ABORT_RPL_RSS]     = abort_rpl,
+        [CPL_ABORT_RPL]         = abort_rpl,
+        [CPL_PASS_OPEN_RPL]     = pass_open_rpl,
+        [CPL_CLOSE_LISTSRV_RPL] = close_listsrv_rpl,
+        [CPL_PASS_ACCEPT_REQ]   = pass_accept_req,
+        [CPL_PASS_ESTABLISH]    = pass_establish,
+        [CPL_PEER_CLOSE]        = peer_close,
+        [CPL_ABORT_REQ_RSS]     = peer_abort,
+        [CPL_CLOSE_CON_RPL]     = close_con_rpl,
+        [CPL_RDMA_TERMINATE]    = terminate,
+        [CPL_RDMA_EC_STATUS]    = ec_status,
+};
+
+static void process_work(struct work_struct *work)
+{
+        struct sk_buff *skb = NULL;
+        void *ep;
+        struct t3cdev *tdev;
+        int ret;
+
+        while ((skb = skb_dequeue(&rxq))) {
+                ep = *((void **) (skb->cb));
+                tdev = *((struct t3cdev **) (skb->cb + sizeof(void *)));
+                ret = work_handlers[G_OPCODE(ntohl((__force __be32)skb->csum))](tdev, skb, ep);
+                if (ret & CPL_RET_BUF_DONE)
+                        kfree_skb(skb);
+
+                /*
+                 * ep was referenced in sched(), and is freed here.
+                 */
+                put_ep((struct iwch_ep_common *)ep);
+        }
+}
+
+static DECLARE_WORK(skb_work, process_work);
+
 static int sched(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
 {
         struct iwch_ep_common *epc = ctx;
@@ -2189,6 +2207,29 @@ static int set_tcb_rpl(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
         return CPL_RET_BUF_DONE;
 }
 
+/*
+ * All upcalls from the T3 Core go to sched() to schedule the
+ * processing on a work queue.
+ */
+cxgb3_cpl_handler_func t3c_handlers[NUM_CPL_CMDS] = {
+        [CPL_ACT_ESTABLISH]     = sched,
+        [CPL_ACT_OPEN_RPL]      = sched,
+        [CPL_RX_DATA]           = sched,
+        [CPL_TX_DMA_ACK]        = sched,
+        [CPL_ABORT_RPL_RSS]     = sched,
+        [CPL_ABORT_RPL]         = sched,
+        [CPL_PASS_OPEN_RPL]     = sched,
+        [CPL_CLOSE_LISTSRV_RPL] = sched,
+        [CPL_PASS_ACCEPT_REQ]   = sched,
+        [CPL_PASS_ESTABLISH]    = sched,
+        [CPL_PEER_CLOSE]        = sched,
+        [CPL_CLOSE_CON_RPL]     = sched,
+        [CPL_ABORT_REQ_RSS]     = sched,
+        [CPL_RDMA_TERMINATE]    = sched,
+        [CPL_RDMA_EC_STATUS]    = sched,
+        [CPL_SET_TCB_RPL]       = set_tcb_rpl,
+};
+
 int __init iwch_cm_init(void)
 {
         skb_queue_head_init(&rxq);
@@ -2197,46 +2238,6 @@ int __init iwch_cm_init(void)
         if (!workq)
                 return -ENOMEM;
 
-        /*
-         * All upcalls from the T3 Core go to sched() to
-         * schedule the processing on a work queue.
-         */
-        t3c_handlers[CPL_ACT_ESTABLISH] = sched;
-        t3c_handlers[CPL_ACT_OPEN_RPL] = sched;
-        t3c_handlers[CPL_RX_DATA] = sched;
-        t3c_handlers[CPL_TX_DMA_ACK] = sched;
-        t3c_handlers[CPL_ABORT_RPL_RSS] = sched;
-        t3c_handlers[CPL_ABORT_RPL] = sched;
-        t3c_handlers[CPL_PASS_OPEN_RPL] = sched;
-        t3c_handlers[CPL_CLOSE_LISTSRV_RPL] = sched;
-        t3c_handlers[CPL_PASS_ACCEPT_REQ] = sched;
-        t3c_handlers[CPL_PASS_ESTABLISH] = sched;
-        t3c_handlers[CPL_PEER_CLOSE] = sched;
-        t3c_handlers[CPL_CLOSE_CON_RPL] = sched;
-        t3c_handlers[CPL_ABORT_REQ_RSS] = sched;
-        t3c_handlers[CPL_RDMA_TERMINATE] = sched;
-        t3c_handlers[CPL_RDMA_EC_STATUS] = sched;
-        t3c_handlers[CPL_SET_TCB_RPL] = set_tcb_rpl;
-
-        /*
-         * These are the real handlers that are called from a
-         * work queue.
-         */
-        work_handlers[CPL_ACT_ESTABLISH] = act_establish;
-        work_handlers[CPL_ACT_OPEN_RPL] = act_open_rpl;
-        work_handlers[CPL_RX_DATA] = rx_data;
-        work_handlers[CPL_TX_DMA_ACK] = tx_ack;
-        work_handlers[CPL_ABORT_RPL_RSS] = abort_rpl;
-        work_handlers[CPL_ABORT_RPL] = abort_rpl;
-        work_handlers[CPL_PASS_OPEN_RPL] = pass_open_rpl;
-        work_handlers[CPL_CLOSE_LISTSRV_RPL] = close_listsrv_rpl;
-        work_handlers[CPL_PASS_ACCEPT_REQ] = pass_accept_req;
-        work_handlers[CPL_PASS_ESTABLISH] = pass_establish;
-        work_handlers[CPL_PEER_CLOSE] = peer_close;
-        work_handlers[CPL_ABORT_REQ_RSS] = peer_abort;
-        work_handlers[CPL_CLOSE_CON_RPL] = close_con_rpl;
-        work_handlers[CPL_RDMA_TERMINATE] = terminate;
-        work_handlers[CPL_RDMA_EC_STATUS] = ec_status;
         return 0;
 }