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authorKarsten Graul <kgraul@linux.ibm.com>2020-05-01 13:48:12 +0300
committerDavid S. Miller <davem@davemloft.net>2020-05-02 02:20:05 +0300
commit8574cf4055ab44724ee9a4c30921d3ed853d787c (patch)
tree4b01341b843dbde750926e0987d70e87af1f2046 /net/smc/smc_llc.c
parent6c868a3edc70ec9819d6a94268625d25e6bc9587 (diff)
downloadlinux-8574cf4055ab44724ee9a4c30921d3ed853d787c.tar.xz
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>
Diffstat (limited to 'net/smc/smc_llc.c')
-rw-r--r--net/smc/smc_llc.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/net/smc/smc_llc.c b/net/smc/smc_llc.c
index e478a4c11877..3a25b6ebe3a8 100644
--- a/net/smc/smc_llc.c
+++ b/net/smc/smc_llc.c
@@ -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)
{