Commit ae3877bc authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'ncsi-fixes' 



Gavin Shan says:

====================
net/ncsi: More bug fixes

This series fixes 2 issues that were found during NCSI's availability
testing on BCM5718 and improves HNCDSC AEN handler:

   * PATCH[1] refactors the code so that minimal code change is put
     to PATCH[2].
   * PATCH[2] fixes the NCSI channel's stale link state before doing
     failover.
   * PATCH[3] chooses the hot channel, which was ever chosen as active
     channel, when the available channels are all in link-down state.
   * PATCH[4] improves Host Network Controller Driver Status Change
     (HNCDSC) AEN handler

Changelog
=========
v2:
   * Merged PATCH[v1 1/2] to PATCH[v2 1].
   * Avoid if/else statements in ncsi_suspend_channel() as Joel suggested.
   * Added comments to explain why we need retrieve last link states in
     ncsi_suspend_channel().
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 5712bf9c 22d8aa93

net/ncsi/internal.h

+2 −0
Original line number Diff line number Diff line
@@ -246,6 +246,7 @@ enum { 
	ncsi_dev_state_config_gls,

	ncsi_dev_state_config_done,

	ncsi_dev_state_suspend_select	= 0x0401,

	ncsi_dev_state_suspend_gls,

	ncsi_dev_state_suspend_dcnt,

	ncsi_dev_state_suspend_dc,

	ncsi_dev_state_suspend_deselect,
@@ -264,6 +265,7 @@ struct ncsi_dev_priv { 
#endif

	unsigned int        package_num;     /* Number of packages         */

	struct list_head    packages;        /* List of packages           */

	struct ncsi_channel *hot_channel;    /* Channel was ever active    */

	struct ncsi_request requests[256];   /* Request table              */

	unsigned int        request_id;      /* Last used request ID       */

#define NCSI_REQ_START_IDX	1

net/ncsi/ncsi-aen.c

+15 −3
Original line number Diff line number Diff line
@@ -141,23 +141,35 @@ static int ncsi_aen_handler_hncdsc(struct ncsi_dev_priv *ndp, 
		return -ENODEV;



	/* If the channel is active one, we need reconfigure it */

	spin_lock_irqsave(&nc->lock, flags);

	ncm = &nc->modes[NCSI_MODE_LINK];

	hncdsc = (struct ncsi_aen_hncdsc_pkt *)h;

	ncm->data[3] = ntohl(hncdsc->status);

	if (!list_empty(&nc->link) ||

	    nc->state != NCSI_CHANNEL_ACTIVE ||

	    (ncm->data[3] & 0x1))

	    nc->state != NCSI_CHANNEL_ACTIVE) {

		spin_unlock_irqrestore(&nc->lock, flags);

		return 0;

	}



	if (ndp->flags & NCSI_DEV_HWA)

	spin_unlock_irqrestore(&nc->lock, flags);

	if (!(ndp->flags & NCSI_DEV_HWA) && !(ncm->data[3] & 0x1))

		ndp->flags |= NCSI_DEV_RESHUFFLE;



	/* If this channel is the active one and the link doesn't

	 * work, we have to choose another channel to be active one.

	 * The logic here is exactly similar to what we do when link

	 * is down on the active channel.

	 *

	 * On the other hand, we need configure it when host driver

	 * state on the active channel becomes ready.

	 */

	ncsi_stop_channel_monitor(nc);



	spin_lock_irqsave(&nc->lock, flags);

	nc->state = (ncm->data[3] & 0x1) ? NCSI_CHANNEL_INACTIVE :

					   NCSI_CHANNEL_ACTIVE;

	spin_unlock_irqrestore(&nc->lock, flags);



	spin_lock_irqsave(&ndp->lock, flags);

	list_add_tail_rcu(&nc->link, &ndp->channel_queue);

	spin_unlock_irqrestore(&ndp->lock, flags);

net/ncsi/ncsi-manage.c

+95 −31
Original line number Diff line number Diff line
@@ -540,42 +540,86 @@ static void ncsi_suspend_channel(struct ncsi_dev_priv *ndp) 
		nd->state = ncsi_dev_state_suspend_select;

		/* Fall through */

	case ncsi_dev_state_suspend_select:

	case ncsi_dev_state_suspend_dcnt:

	case ncsi_dev_state_suspend_dc:

	case ncsi_dev_state_suspend_deselect:

		ndp->pending_req_num = 1;



		np = ndp->active_package;

		nc = ndp->active_channel;

		nca.package = np->id;

		if (nd->state == ncsi_dev_state_suspend_select) {

		nca.type = NCSI_PKT_CMD_SP;

		nca.package = np->id;

		nca.channel = NCSI_RESERVED_CHANNEL;

		if (ndp->flags & NCSI_DEV_HWA)

			nca.bytes[0] = 0;

		else

			nca.bytes[0] = 1;



		/* To retrieve the last link states of channels in current

		 * package when current active channel needs fail over to

		 * another one. It means we will possibly select another

		 * channel as next active one. The link states of channels

		 * are most important factor of the selection. So we need

		 * accurate link states. Unfortunately, the link states on

		 * inactive channels can't be updated with LSC AEN in time.

		 */

		if (ndp->flags & NCSI_DEV_RESHUFFLE)

			nd->state = ncsi_dev_state_suspend_gls;

		else

			nd->state = ncsi_dev_state_suspend_dcnt;

		} else if (nd->state == ncsi_dev_state_suspend_dcnt) {

		ret = ncsi_xmit_cmd(&nca);

		if (ret)

			goto error;



		break;

	case ncsi_dev_state_suspend_gls:

		ndp->pending_req_num = np->channel_num;



		nca.type = NCSI_PKT_CMD_GLS;

		nca.package = np->id;



		nd->state = ncsi_dev_state_suspend_dcnt;

		NCSI_FOR_EACH_CHANNEL(np, nc) {

			nca.channel = nc->id;

			ret = ncsi_xmit_cmd(&nca);

			if (ret)

				goto error;

		}



		break;

	case ncsi_dev_state_suspend_dcnt:

		ndp->pending_req_num = 1;



		nca.type = NCSI_PKT_CMD_DCNT;

		nca.package = np->id;

		nca.channel = nc->id;



		nd->state = ncsi_dev_state_suspend_dc;

		} else if (nd->state == ncsi_dev_state_suspend_dc) {

		ret = ncsi_xmit_cmd(&nca);

		if (ret)

			goto error;



		break;

	case ncsi_dev_state_suspend_dc:

		ndp->pending_req_num = 1;



		nca.type = NCSI_PKT_CMD_DC;

		nca.package = np->id;

		nca.channel = nc->id;

		nca.bytes[0] = 1;



		nd->state = ncsi_dev_state_suspend_deselect;

		} else if (nd->state == ncsi_dev_state_suspend_deselect) {

		ret = ncsi_xmit_cmd(&nca);

		if (ret)

			goto error;



		break;

	case ncsi_dev_state_suspend_deselect:

		ndp->pending_req_num = 1;



		nca.type = NCSI_PKT_CMD_DP;

		nca.package = np->id;

		nca.channel = NCSI_RESERVED_CHANNEL;

			nd->state = ncsi_dev_state_suspend_done;

		}



		nd->state = ncsi_dev_state_suspend_done;

		ret = ncsi_xmit_cmd(&nca);

		if (ret) {

			nd->state = ncsi_dev_state_functional;

			return;

		}

		if (ret)

			goto error;



		break;

	case ncsi_dev_state_suspend_done:
@@ -589,6 +633,10 @@ static void ncsi_suspend_channel(struct ncsi_dev_priv *ndp) 
		netdev_warn(nd->dev, "Wrong NCSI state 0x%x in suspend\n",

			    nd->state);

	}



	return;

error:

	nd->state = ncsi_dev_state_functional;

}



static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
@@ -597,6 +645,7 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp) 
	struct net_device *dev = nd->dev;

	struct ncsi_package *np = ndp->active_package;

	struct ncsi_channel *nc = ndp->active_channel;

	struct ncsi_channel *hot_nc = NULL;

	struct ncsi_cmd_arg nca;

	unsigned char index;

	unsigned long flags;
@@ -702,12 +751,20 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp) 
		break;

	case ncsi_dev_state_config_done:

		spin_lock_irqsave(&nc->lock, flags);

		if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1)

		if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1) {

			hot_nc = nc;

			nc->state = NCSI_CHANNEL_ACTIVE;

		else

		} else {

			hot_nc = NULL;

			nc->state = NCSI_CHANNEL_INACTIVE;

		}

		spin_unlock_irqrestore(&nc->lock, flags);



		/* Update the hot channel */

		spin_lock_irqsave(&ndp->lock, flags);

		ndp->hot_channel = hot_nc;

		spin_unlock_irqrestore(&ndp->lock, flags);



		ncsi_start_channel_monitor(nc);

		ncsi_process_next_channel(ndp);

		break;
@@ -725,10 +782,14 @@ error: 
static int ncsi_choose_active_channel(struct ncsi_dev_priv *ndp)

{

	struct ncsi_package *np;

	struct ncsi_channel *nc, *found;

	struct ncsi_channel *nc, *found, *hot_nc;

	struct ncsi_channel_mode *ncm;

	unsigned long flags;



	spin_lock_irqsave(&ndp->lock, flags);

	hot_nc = ndp->hot_channel;

	spin_unlock_irqrestore(&ndp->lock, flags);



	/* The search is done once an inactive channel with up

	 * link is found.

	 */
@@ -746,6 +807,9 @@ static int ncsi_choose_active_channel(struct ncsi_dev_priv *ndp) 
			if (!found)

				found = nc;



			if (nc == hot_nc)

				found = nc;



			ncm = &nc->modes[NCSI_MODE_LINK];

			if (ncm->data[2] & 0x1) {

				spin_unlock_irqrestore(&nc->lock, flags);

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