mirror of https://gerrit.osmocom.org/libosmocore
LAPD: Always update N(R) in pending TX frames if V(R) is incremented
The outcome of the update function is still used to indicate if an RR frame must be sent or not. Only if there is no I frame in the TX queue, RR frame must be sent. Related: OS#4074 Change-Id: I71676c709878105bfd18b9370fecc61b92796a6f
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@ -658,7 +658,8 @@ static int update_pending_frames(struct lapd_msg_ctx *lctx)
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LAPDm_CTRL_PF_BIT(msg->l2h[1]));
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rc = 0;
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} else if (LAPDm_CTRL_is_S(msg->l2h[1])) {
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LOGDL(dl, LOGL_ERROR, "Supervisory frame in queue, this shouldn't happen\n");
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msg->l2h[1] = LAPDm_CTRL_S(dl->v_recv, LAPDm_CTRL_S_BITS(msg->l2h[1]),
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LAPDm_CTRL_PF_BIT(msg->l2h[1]));
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}
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}
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@ -1525,6 +1525,7 @@ static int lapd_rx_i(struct msgb *msg, struct lapd_msg_ctx *lctx)
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uint8_t ns = lctx->n_send;
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int length = lctx->length;
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int rc;
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bool i_frame_in_queue = false;
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LOGDL(dl, LOGL_INFO, "I received in state %s on SAPI(%u)\n",
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lapd_state_name(dl->state), lctx->sapi);
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@ -1615,6 +1616,13 @@ static int lapd_rx_i(struct msgb *msg, struct lapd_msg_ctx *lctx)
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dl->v_recv = inc_mod(dl->v_recv, dl->v_range);
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LOGDL(dl, LOGL_INFO, "incrementing V(R) to %u\n", dl->v_recv);
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/* Update all pending frames in the queue to the new V(R) state. */
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if (dl->update_pending_frames) {
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rc = dl->update_pending_frames(lctx);
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if (!rc)
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i_frame_in_queue = true;
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}
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/* 5.5.3.1: Acknowlege all transmitted frames up the the N(R)-1 */
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lapd_acknowledge(lctx); /* V(A) is also set here */
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@ -1680,13 +1688,7 @@ static int lapd_rx_i(struct msgb *msg, struct lapd_msg_ctx *lctx)
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if (!dl->own_busy) {
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/* NOTE: V(R) is already set above */
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rc = lapd_send_i(dl, __LINE__, false);
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/* if update_pending_iframe returns 0 it updated
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* the lapd header of an iframe in the tx queue */
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if (rc && dl->update_pending_frames)
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rc = dl->update_pending_frames(lctx);
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if (rc) {
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if (rc && !i_frame_in_queue) {
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LOGDL(dl, LOGL_INFO, "we are not busy and have no pending data, "
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"send RR\n");
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/* Send RR with F=0 */
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