tbf: Use plain old data structure (PODS) for llist management
The PODS struct has a back pointer to access the actual object. llist_pods_for_each_entry traverses the list of struct llist_pods and makes the entry available (through the back pointer). Ticket: SYS#389 Sponsored-by: On-Waves ehf
This commit is contained in:
parent
4bbe3349c2
commit
1b3864fc47
17
src/bts.cpp
17
src/bts.cpp
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@ -138,6 +138,7 @@ int BTS::add_paging(uint8_t chan_needed, uint8_t *identity_lv)
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{
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uint8_t l, trx, ts, any_tbf = 0;
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struct gprs_rlcmac_tbf *tbf;
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struct llist_pods *lpods;
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struct gprs_rlcmac_paging *pag;
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uint8_t slot_mask[8];
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int8_t first_ts; /* must be signed */
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@ -158,7 +159,7 @@ int BTS::add_paging(uint8_t chan_needed, uint8_t *identity_lv)
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* Don't mark, if TBF uses a different slot that is already marked. */
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memset(slot_mask, 0, sizeof(slot_mask));
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for (l = 0; tbfs_lists[l]; l++) {
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llist_for_each_entry(tbf, tbfs_lists[l], list) {
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llist_pods_for_each_entry(tbf, tbfs_lists[l], list, lpods) {
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first_ts = -1;
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for (ts = 0; ts < 8; ts++) {
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if (tbf->pdch[ts]) {
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@ -232,15 +233,16 @@ gprs_rlcmac_ul_tbf *BTS::ul_tbf_by_tlli(uint32_t tlli)
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gprs_rlcmac_tbf *BTS::tbf_by_tlli(uint32_t tlli, enum gprs_rlcmac_tbf_direction dir)
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{
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struct gprs_rlcmac_tbf *tbf;
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struct llist_pods *lpods;
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if (dir == GPRS_RLCMAC_UL_TBF) {
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llist_for_each_entry(tbf, &m_bts.ul_tbfs, list) {
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llist_pods_for_each_entry(tbf, &m_bts.ul_tbfs, list, lpods) {
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OSMO_ASSERT(tbf->direction == dir);
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if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)
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&& tbf->tlli() == tlli && tbf->is_tlli_valid())
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return tbf;
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}
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} else {
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llist_for_each_entry(tbf, &m_bts.dl_tbfs, list) {
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llist_pods_for_each_entry(tbf, &m_bts.dl_tbfs, list, lpods) {
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OSMO_ASSERT(tbf->direction == dir);
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if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)
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&& tbf->tlli() == tlli)
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@ -253,10 +255,11 @@ gprs_rlcmac_tbf *BTS::tbf_by_tlli(uint32_t tlli, enum gprs_rlcmac_tbf_direction
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gprs_rlcmac_dl_tbf *BTS::dl_tbf_by_poll_fn(uint32_t fn, uint8_t trx, uint8_t ts)
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{
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struct gprs_rlcmac_dl_tbf *tbf;
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struct llist_pods *lpods;
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/* only one TBF can poll on specific TS/FN, because scheduler can only
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* schedule one downlink control block (with polling) at a FN per TS */
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llist_for_each_entry(tbf, &m_bts.dl_tbfs, list) {
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llist_pods_for_each_entry(tbf, &m_bts.dl_tbfs, list, lpods) {
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if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)
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&& tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
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&& tbf->poll_fn == fn && tbf->trx->trx_no == trx
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@ -270,10 +273,11 @@ gprs_rlcmac_dl_tbf *BTS::dl_tbf_by_poll_fn(uint32_t fn, uint8_t trx, uint8_t ts)
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gprs_rlcmac_ul_tbf *BTS::ul_tbf_by_poll_fn(uint32_t fn, uint8_t trx, uint8_t ts)
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{
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struct gprs_rlcmac_ul_tbf *tbf;
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struct llist_pods *lpods;
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/* only one TBF can poll on specific TS/FN, because scheduler can only
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* schedule one downlink control block (with polling) at a FN per TS */
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llist_for_each_entry(tbf, &m_bts.ul_tbfs, list) {
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llist_pods_for_each_entry(tbf, &m_bts.ul_tbfs, list, lpods) {
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if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)
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&& tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
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&& tbf->poll_fn == fn && tbf->trx->trx_no == trx
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@ -1042,8 +1046,9 @@ gprs_rlcmac_tbf *gprs_rlcmac_pdch::tbf_from_list_by_tfi(struct llist_head *tbf_l
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enum gprs_rlcmac_tbf_direction dir)
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{
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gprs_rlcmac_tbf *tbf;
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struct llist_pods *lpods;
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llist_for_each_entry(tbf, tbf_list, list) {
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llist_pods_for_each_entry(tbf, tbf_list, list, lpods) {
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OSMO_ASSERT(tbf->direction == dir);
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if (tbf->tfi() != tfi)
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continue;
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@ -31,6 +31,7 @@ static uint32_t sched_poll(struct gprs_rlcmac_bts *bts,
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struct gprs_rlcmac_tbf **ul_ack_tbf)
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{
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struct gprs_rlcmac_tbf *tbf;
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struct llist_pods *lpods;
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uint32_t poll_fn;
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/* check special TBF for events */
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@ -38,7 +39,7 @@ static uint32_t sched_poll(struct gprs_rlcmac_bts *bts,
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if ((block_nr % 3) == 2)
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poll_fn ++;
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poll_fn = poll_fn % 2715648;
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llist_for_each_entry(tbf, &bts->ul_tbfs, list) {
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llist_pods_for_each_entry(tbf, &bts->ul_tbfs, list, lpods) {
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/* this trx, this ts */
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if (tbf->trx->trx_no != trx || tbf->control_ts != ts)
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continue;
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@ -54,7 +55,7 @@ static uint32_t sched_poll(struct gprs_rlcmac_bts *bts,
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*ul_ass_tbf = tbf;
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#warning "Is this supposed to be fair? The last TBF for each wins? Maybe use llist_add_tail and skip once we have all states?"
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}
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llist_for_each_entry(tbf, &bts->dl_tbfs, list) {
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llist_pods_for_each_entry(tbf, &bts->dl_tbfs, list, lpods) {
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/* this trx, this ts */
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if (tbf->trx->trx_no != trx || tbf->control_ts != ts)
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continue;
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@ -33,10 +33,11 @@ void PollController::expireTimedout(int frame_number)
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struct gprs_rlcmac_bts *bts = m_bts.bts_data();
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struct gprs_rlcmac_tbf *tbf;
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struct gprs_rlcmac_sba *sba, *sba2;
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struct llist_pods *lpods;
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uint32_t elapsed;
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/* check for poll timeout */
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llist_for_each_entry(tbf, &bts->ul_tbfs, list) {
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llist_pods_for_each_entry(tbf, &bts->ul_tbfs, list, lpods) {
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if (tbf->poll_state == GPRS_RLCMAC_POLL_SCHED) {
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elapsed = (frame_number + 2715648 - tbf->poll_fn)
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% 2715648;
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@ -44,7 +45,7 @@ void PollController::expireTimedout(int frame_number)
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tbf->poll_timeout();
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}
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}
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llist_for_each_entry(tbf, &bts->dl_tbfs, list) {
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llist_pods_for_each_entry(tbf, &bts->dl_tbfs, list, lpods) {
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if (tbf->poll_state == GPRS_RLCMAC_POLL_SCHED) {
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elapsed = (frame_number + 2715648 - tbf->poll_fn)
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% 2715648;
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17
src/tbf.cpp
17
src/tbf.cpp
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@ -286,7 +286,7 @@ void tbf_free(struct gprs_rlcmac_tbf *tbf)
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#warning "TODO: Could/Should generate bssgp_tx_llc_discarded"
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tbf->m_llc.clear(tbf->bts);
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tbf_unlink_pdch(tbf);
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llist_del(&tbf->list);
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llist_del(&tbf->list.list);
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if (tbf->direction == GPRS_RLCMAC_UL_TBF)
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tbf->bts->tbf_ul_freed();
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@ -491,6 +491,9 @@ static int setup_tbf(struct gprs_rlcmac_tbf *tbf, struct gprs_rlcmac_bts *bts,
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if (!tbf)
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return -1;
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/* Back pointer for PODS llist compatibility */
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tbf->list.back = tbf;
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tbf->m_created_ts = time(NULL);
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tbf->bts = bts->bts;
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tbf->m_tfi = tfi;
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@ -548,7 +551,7 @@ struct gprs_rlcmac_ul_tbf *tbf_alloc_ul_tbf(struct gprs_rlcmac_bts *bts,
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return NULL;
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}
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llist_add(&tbf->list, &bts->ul_tbfs);
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llist_add(&tbf->list.list, &bts->ul_tbfs);
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tbf->bts->tbf_ul_created();
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return tbf;
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@ -581,7 +584,7 @@ struct gprs_rlcmac_dl_tbf *tbf_alloc_dl_tbf(struct gprs_rlcmac_bts *bts,
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return NULL;
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}
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llist_add(&tbf->list, &bts->dl_tbfs);
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llist_add(&tbf->list.list, &bts->dl_tbfs);
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tbf->bts->tbf_dl_created();
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return tbf;
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@ -1805,11 +1808,11 @@ bool gprs_rlcmac_tbf::dl_window_stalled() const
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void gprs_rlcmac_tbf::rotate_in_list()
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{
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llist_del(&list);
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llist_del(&list.list);
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if (direction == GPRS_RLCMAC_UL_TBF)
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llist_add(&list, &bts->bts_data()->ul_tbfs);
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llist_add(&list.list, &bts->bts_data()->ul_tbfs);
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else
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llist_add(&list, &bts->bts_data()->dl_tbfs);
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llist_add(&list.list, &bts->bts_data()->dl_tbfs);
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}
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uint8_t gprs_rlcmac_tbf::tsc() const
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@ -1819,7 +1822,7 @@ uint8_t gprs_rlcmac_tbf::tsc() const
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void tbf_print_vty_info(struct vty *vty, llist_head *ltbf)
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{
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gprs_rlcmac_tbf *tbf = llist_entry(ltbf, gprs_rlcmac_tbf, list);
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gprs_rlcmac_tbf *tbf = llist_pods_entry(ltbf, gprs_rlcmac_tbf);
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vty_out(vty, "TBF: TFI=%d TLLI=0x%08x (%s) DIR=%s IMSI=%s%s", tbf->tfi(),
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tbf->tlli(), tbf->is_tlli_valid() ? "valid" : "invalid",
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24
src/tbf.h
24
src/tbf.h
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@ -84,6 +84,28 @@ enum gprs_rlcmac_tbf_direction {
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#define GPRS_RLCMAC_FLAG_TO_DL_ASS 7
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#define GPRS_RLCMAC_FLAG_TO_MASK 0xf0 /* timeout bits */
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struct llist_pods {
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struct llist_head list;
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void *back;
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};
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#define llist_pods_entry(ptr, type) \
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((type *)(container_of(ptr, struct llist_pods, list)->back))
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/**
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* llist_pods_for_each_entry - like llist_for_each_entry, but uses
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* struct llist_pods ->back to access the entry.
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* This is necessary for non-PODS classes because container_of is
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* not guaranteed to work anymore. */
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#define llist_pods_for_each_entry(pos, head, member, lpods) \
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for (lpods = llist_entry((head)->next, typeof(struct llist_pods), list), \
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pos = ((typeof(pos))lpods->back), \
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prefetch(pos->member.list.next); \
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&lpods->list != (head); \
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lpods = llist_entry(lpods->list.next, typeof(struct llist_pods), list), \
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pos = ((typeof(pos))lpods->back),\
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prefetch(pos->member.list.next))
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struct gprs_rlcmac_tbf {
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static void free_all(struct gprs_rlcmac_trx *trx);
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@ -143,7 +165,7 @@ struct gprs_rlcmac_tbf {
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/* attempt to make things a bit more fair */
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void rotate_in_list();
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struct llist_head list;
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struct llist_pods list;
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uint32_t state_flags;
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enum gprs_rlcmac_tbf_direction direction;
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struct gprs_rlcmac_trx *trx;
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