sched: Attempt to improve the fairness and schedule UL/AL ACK/ASS
It is possible that certain UL ACK messages are not sent when there are many many uplink and downlink assignments. Try to be more fair and schedule them round-robin. This way no starvation should occur.
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@ -67,6 +67,7 @@ struct gprs_rlcmac_pdch {
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uint8_t tsc; /* TSC of this slot */
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uint8_t next_ul_tfi; /* next uplink TBF/TFI to schedule (0..31) */
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uint8_t next_dl_tfi; /* next downlink TBF/TFI to schedule (0..31) */
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uint8_t next_ctrl_prio; /* next kind of ctrl message to schedule */
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struct gprs_rlcmac_tbf *ul_tbf[32]; /* array of UL TBF, by UL TFI */
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struct gprs_rlcmac_tbf *dl_tbf[32]; /* array of DL TBF, by DL TFI */
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struct llist_head paging_list; /* list of paging messages */
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@ -115,22 +115,30 @@ static struct msgb *sched_select_ctrl_msg(
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{
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struct msgb *msg = NULL;
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struct gprs_rlcmac_tbf *tbf = NULL;
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struct gprs_rlcmac_tbf *next_list[3] = { ul_ass_tbf, dl_ass_tbf, ul_ack_tbf };
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/* schedule PACKET UPLINK ASSIGNMENT (1st priority) */
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if (ul_ass_tbf) {
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tbf = ul_ass_tbf;
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for (size_t i = 0; i < ARRAY_SIZE(next_list); ++i) {
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tbf = next_list[(pdch->next_ctrl_prio + i) % 3];
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if (!tbf)
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continue;
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if (tbf == ul_ass_tbf)
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msg = tbf->create_ul_ass(fn);
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}
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/* schedule PACKET DOWNLINK ASSIGNMENT (2nd priotiry) */
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if (!msg && dl_ass_tbf) {
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tbf = dl_ass_tbf;
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else if (tbf == dl_ass_tbf)
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msg = tbf->create_dl_ass(fn);
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}
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/* schedule PACKET UPLINK ACK (3rd priority) */
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if (!msg && ul_ack_tbf) {
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tbf = ul_ack_tbf;
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else
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msg = tbf->create_ul_ack(fn);
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if (!msg) {
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tbf = NULL;
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continue;
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}
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pdch->next_ctrl_prio += i + 1;
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pdch->next_ctrl_prio %= 3;
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break;
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}
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/* any message */
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if (msg) {
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tbf->rotate_in_list();
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