compat/freebsd_iflib/iflib.c

324 /* this should really scale with ring size - this is a fairly arbitrary value */
553  * Only allow a single packet to take up most 1/nth of the tx ring
892 	struct netmap_ring *ring = kring->ring;
951 			struct netmap_slot *slot = &ring->slot[nm_i];
1001  * Reconcile kernel and user view of the transmit ring.
1019 	struct netmap_ring *ring = kring->ring;
1021 	u_int nic_i;	/* index into the NIC ring */
1030 	 * them every half ring, or where NS_REPORT is set
1043 	 * nic_i is the corresponding index in the NIC ring.
1046 	 * iterate over the netmap ring, fetch length and update
1047 	 * the corresponding slot in the NIC ring. Some drivers also
1056 	 * but only a few times per ring or when NS_REPORT is set.
1071 		__builtin_prefetch(&ring->slot[nm_i]);
1076 			struct netmap_slot *slot = &ring->slot[nm_i];
1106 				/* Prepare the NIC TX ring. */
1120 			__builtin_prefetch(&ring->slot[nm_i + 1]);
1142 		/* synchronize the NIC ring */
1180  * Reconcile kernel and user view of the receive ring.
1196 	struct netmap_ring *ring = kring->ring;
1198 	uint32_t nm_i;	/* index into the netmap ring */
1199 	uint32_t nic_i;	/* index into the NIC ring */
1224 	 * nm_i is the index of the next free slot in the netmap ring,
1225 	 * nic_i is the index of the next received packet in the NIC ring
1228 	 * in netmap mode. For the receive ring we have
1235 	 * fl->ifl_cidx is set to 0 on a ring reinit
1267 					ring->slot[nm_i].len = 0;
1268 					ring->slot[nm_i].flags = 0;
1270 					ring->slot[nm_i].len = ri.iri_frags[i].irf_len;
1272 						ring->slot[nm_i].len -= crclen;
1273 						ring->slot[nm_i].flags = 0;
1279 						ring->slot[nm_i].flags = NS_MOREFRAG;
1309 	 * As usual nm_i is the index in the netmap ring,
1310 	 * nic_i is the index in the NIC ring, and
1372 		 * the physical buffer address in the NIC ring.
2229 	 * Intel NICs have (per receive ring) RDH and RDT registers, where
2374  *  Free receive ring data structures
3197 iflib_txd_db_check(iflib_txq_t txq, int ring)
3204 	/* force || threshold exceeded || at the edge of the ring */
3205 	if (ring || (txq->ift_db_pending >= max) || (TXQ_AVAIL(txq) <= MAX_TX_DESC(ctx) + 2)) {
3853 	bool do_prefetch, rang, ring;
3939 	ring = rang ? false  : (iflib_min_tx_latency | err);
3940 	iflib_txd_db_check(txq, ring);
4278  * ring.  Technically, when using ALTQ, queueing to an intermediate mp_ring
6032 	/* Allocate the TX ring struct memory */
6036 		device_printf(dev, "Unable to allocate TX ring memory\n");
6045 		device_printf(dev, "Unable to allocate RX ring memory\n");
6155 		/* Allocate receive buffers for the ring */
7101 		    mp_ring_state_handler, "A", "soft ring state");