Commit 8574cf40 authored by Karsten Graul's avatar Karsten Graul Committed by David S. Miller
Browse files

net/smc: allocate index for a new link 



Add smc_llc_alloc_alt_link() to find a free link index for a new link,
depending on the new link group type. And update constants for the
maximum number of links to 3 (2 symmetric and 1 dangling asymmetric link).
These maximum numbers are the same as used by other implementations of the
SMC-R protocol.

Signed-off-by: default avatarKarsten Graul <kgraul@linux.ibm.com>
Reviewed-by: default avatarUrsula Braun <ubraun@linux.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6c868a3e

net/smc/smc_core.h

+1 −1
Original line number Diff line number Diff line
@@ -128,7 +128,7 @@ struct smc_link { 
/* For now we just allow one parallel link per link group. The SMC protocol

 * allows more (up to 8).

 */

#define SMC_LINKS_PER_LGR_MAX	1

#define SMC_LINKS_PER_LGR_MAX	3

#define SMC_SINGLE_LINK		0



#define SMC_FIRST_CONTACT	1		/* first contact to a peer */

net/smc/smc_llc.c

+24 −0
Original line number Diff line number Diff line
@@ -541,6 +541,30 @@ static int smc_llc_send_message(struct smc_link *link, void *llcbuf) 


/********************************* receive ***********************************/



static int smc_llc_alloc_alt_link(struct smc_link_group *lgr,

				  enum smc_lgr_type lgr_new_t)

{

	int i;



	if (lgr->type == SMC_LGR_SYMMETRIC ||

	    (lgr->type != SMC_LGR_SINGLE &&

	     (lgr_new_t == SMC_LGR_ASYMMETRIC_LOCAL ||

	      lgr_new_t == SMC_LGR_ASYMMETRIC_PEER)))

		return -EMLINK;



	if (lgr_new_t == SMC_LGR_ASYMMETRIC_LOCAL ||

	    lgr_new_t == SMC_LGR_ASYMMETRIC_PEER) {

		for (i = SMC_LINKS_PER_LGR_MAX - 1; i >= 0; i--)

			if (lgr->lnk[i].state == SMC_LNK_UNUSED)

				return i;

	} else {

		for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)

			if (lgr->lnk[i].state == SMC_LNK_UNUSED)

				return i;

	}

	return -EMLINK;

}



static void smc_llc_rx_delete_link(struct smc_link *link,

				   struct smc_llc_msg_del_link *llc)

{

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