Re: [PATCH] RDMA/cxgb3: Shrink .text with compile-time init of handlers arrays

[Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>]

Looks ok to me.  Functionally it doesn't change anything I guess.



Roland Dreier wrote:
> Hey Steve,
>
> What do you think about this for the next merge window?  I think it
> arguably makes the source cleaner, and it definitely makes the compiled
> code better:
>
> 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
> ---
>  drivers/infiniband/hw/cxgb3/iwch.c    |    2 -
>  drivers/infiniband/hw/cxgb3/iwch_cm.c |  131 +++++++++++++++++----------------
>  2 files changed, 67 insertions(+), 66 deletions(-)
>
> diff --git a/drivers/infiniband/hw/cxgb3/iwch.c b/drivers/infiniband/hw/cxgb3/iwch.c
> index 63f975f..8e77dc5 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 cfd6db0..f2d2c29 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) {
> @@ -2158,6 +2134,50 @@ 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 a 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 +2209,29 @@ 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 +2240,6 @@ 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;
>  }
>  
>
>   

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