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iscsi-target; Allow an extra tag_num / 2 number of percpu_ida tags
This patch bumps the default number of tags allocated per session by iscsi-target via transport_alloc_session_tags() -> percpu_ida_init() by another (tag_num / 2). This is done to take into account the tags waiting to be acknowledged and released in iscsit_ack_from_expstatsn(), but who's number are not directly limited by the CmdSN Window queue_depth being enforced by the target. Using a larger value here is also useful to prevent percpu_ida_alloc() from having to steal tags from other CPUs when no tags are available on the local CPU, while waiting for unacknowledged tags to be released. Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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@ -1192,7 +1192,7 @@ get_target:
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*/
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alloc_tags:
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tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
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tag_num += ISCSIT_EXTRA_TAGS;
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tag_num += (tag_num / 2) + ISCSIT_EXTRA_TAGS;
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tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
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ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
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