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: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -128,7 +128,7 @@ struct smc_link {
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/* For now we just allow one parallel link per link group. The SMC protocol
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* allows more (up to 8).
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*/
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#define SMC_LINKS_PER_LGR_MAX 1
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#define SMC_LINKS_PER_LGR_MAX 3
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#define SMC_SINGLE_LINK 0
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#define SMC_FIRST_CONTACT 1 /* first contact to a peer */
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@ -541,6 +541,30 @@ static int smc_llc_send_message(struct smc_link *link, void *llcbuf)
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/********************************* receive ***********************************/
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static int smc_llc_alloc_alt_link(struct smc_link_group *lgr,
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enum smc_lgr_type lgr_new_t)
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{
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int i;
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if (lgr->type == SMC_LGR_SYMMETRIC ||
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(lgr->type != SMC_LGR_SINGLE &&
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(lgr_new_t == SMC_LGR_ASYMMETRIC_LOCAL ||
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lgr_new_t == SMC_LGR_ASYMMETRIC_PEER)))
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return -EMLINK;
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if (lgr_new_t == SMC_LGR_ASYMMETRIC_LOCAL ||
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lgr_new_t == SMC_LGR_ASYMMETRIC_PEER) {
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for (i = SMC_LINKS_PER_LGR_MAX - 1; i >= 0; i--)
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if (lgr->lnk[i].state == SMC_LNK_UNUSED)
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return i;
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} else {
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for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
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if (lgr->lnk[i].state == SMC_LNK_UNUSED)
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return i;
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}
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return -EMLINK;
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}
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static void smc_llc_rx_delete_link(struct smc_link *link,
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struct smc_llc_msg_del_link *llc)
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{
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