[SCSI] libfc: fcoe_transport_create fails in single-CPU environment
Starting fcoe fails at fcoe_transport_create when attempting to allocate a pool of 4K exchanges on a 64-bit single-CPU environment because the call to __alloc_percpu() is greater than the max of 32K. This patch reduces the number of exchanges to fit within the maximum allowed space. [ Whitespace problems fixed by Robert Love to satisfy chechpatch.pl ] Signed-off-by: Steven Clark <sclark@crossbeam.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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@ -2263,7 +2263,18 @@ struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lport,
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mp->class = class;
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/* adjust em exch xid range for offload */
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mp->min_xid = min_xid;
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mp->max_xid = max_xid;
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/* reduce range so per cpu pool fits into PCPU_MIN_UNIT_SIZE pool */
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pool_exch_range = (PCPU_MIN_UNIT_SIZE - sizeof(*pool)) /
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sizeof(struct fc_exch *);
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if ((max_xid - min_xid + 1) / (fc_cpu_mask + 1) > pool_exch_range) {
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mp->max_xid = pool_exch_range * (fc_cpu_mask + 1) +
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min_xid - 1;
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} else {
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mp->max_xid = max_xid;
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pool_exch_range = (mp->max_xid - mp->min_xid + 1) /
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(fc_cpu_mask + 1);
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}
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mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep);
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if (!mp->ep_pool)
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@ -2274,7 +2285,6 @@ struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lport,
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* divided across all cpus. The exch pointers array memory is
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* allocated for exch range per pool.
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*/
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pool_exch_range = (mp->max_xid - mp->min_xid + 1) / (fc_cpu_mask + 1);
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mp->pool_max_index = pool_exch_range - 1;
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/*
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