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Index: head/sys/net/iflib.c
===================================================================
--- head/sys/net/iflib.c
+++ head/sys/net/iflib.c
@@ -960,10 +960,10 @@
*/
nm_i = netmap_idx_n2k(kring, kring->nr_hwcur);
- pkt_info_zero(&pi);
- pi.ipi_segs = txq->ift_segs;
- pi.ipi_qsidx = kring->ring_id;
if (nm_i != head) { /* we have new packets to send */
+ pkt_info_zero(&pi);
+ pi.ipi_segs = txq->ift_segs;
+ pi.ipi_qsidx = kring->ring_id;
nic_i = netmap_idx_k2n(kring, nm_i);
__builtin_prefetch(&ring->slot[nm_i]);
@@ -1025,11 +1025,24 @@
/*
* Second part: reclaim buffers for completed transmissions.
+ *
+ * If there are unclaimed buffers, attempt to reclaim them.
+ * If none are reclaimed, and TX IRQs are not in use, do an initial
+ * minimal delay, then trigger the tx handler which will spin in the
+ * group task queue.
*/
- if (iflib_tx_credits_update(ctx, txq)) {
- /* some tx completed, increment avail */
- nic_i = txq->ift_cidx_processed;
- kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim);
+ if (kring->nr_hwtail != nm_prev(head, lim)) {
+ if (iflib_tx_credits_update(ctx, txq)) {
+ /* some tx completed, increment avail */
+ nic_i = txq->ift_cidx_processed;
+ kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim);
+ }
+ else {
+ if (!(ctx->ifc_flags & IFC_NETMAP_TX_IRQ)) {
+ DELAY(1);
+ GROUPTASK_ENQUEUE(&ctx->ifc_txqs[txq->ift_id].ift_task);
+ }
+ }
}
return (0);
}
@@ -3702,8 +3715,20 @@
if (!(if_getdrvflags(ctx->ifc_ifp) & IFF_DRV_RUNNING))
return;
if (if_getcapenable(ifp) & IFCAP_NETMAP) {
+ /*
+ * If there are no available credits, and TX IRQs are not in use,
+ * re-schedule the task immediately.
+ */
if (ctx->isc_txd_credits_update(ctx->ifc_softc, txq->ift_id, false))
netmap_tx_irq(ifp, txq->ift_id);
+ else {
+ if (!(ctx->ifc_flags & IFC_NETMAP_TX_IRQ)) {
+ struct netmap_kring *kring = NA(ctx->ifc_ifp)->tx_rings[txq->ift_id];
+
+ if (kring->nr_hwtail != nm_prev(kring->rhead, kring->nkr_num_slots - 1))
+ GROUPTASK_ENQUEUE(&txq->ift_task);
+ }
+ }
IFDI_TX_QUEUE_INTR_ENABLE(ctx, txq->ift_id);
return;
}
@@ -5548,6 +5573,7 @@
fn = _task_fn_tx;
intr_fast = iflib_fast_intr;
GROUPTASK_INIT(gtask, 0, fn, q);
+ ctx->ifc_flags |= IFC_NETMAP_TX_IRQ;
break;
case IFLIB_INTR_RX:
q = &ctx->ifc_rxqs[qid];
Index: head/sys/net/iflib_private.h
===================================================================
--- head/sys/net/iflib_private.h
+++ head/sys/net/iflib_private.h
@@ -43,6 +43,8 @@
#define IFC_CHECK_HUNG 0x200
#define IFC_PSEUDO 0x400
+#define IFC_NETMAP_TX_IRQ 0x80000000
+
MALLOC_DECLARE(M_IFLIB);
#define IFLIB_MAX_TX_BYTES (2*1024*1024)

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