dev/ixgbe/ixgbe_netmap.c

172  * Reconcile kernel and user view of the transmit ring.
190 	struct netmap_ring *ring = kring->ring;
191 	u_int nm_i;	/* index into the netmap ring */
192 	u_int nic_i;	/* index into the NIC ring */
198 	 * them every half ring, or where NS_REPORT is set
212 	 * nm_i is the current index in the netmap ring,
213 	 * nic_i is the corresponding index in the NIC ring.
215 	 * the NIC ring but leave the netmap ring unchanged.
216 	 * For the transmit ring, we have
229 	 * iterate over the netmap ring, fetch length and update
230 	 * the corresponding slot in the NIC ring. Some drivers also
239 	 * but only a few times per ring or when NS_REPORT is set.
249 		__builtin_prefetch(&ring->slot[nm_i]);
253 			struct netmap_slot *slot = &ring->slot[nm_i];
266 			__builtin_prefetch(&ring->slot[nm_i + 1]);
277 			/* Fill the slot in the NIC ring. */
293 		/* synchronize the NIC ring */
359  * Reconcile kernel and user view of the receive ring.
376 	struct netmap_ring *ring = kring->ring;
377 	u_int nm_i;	/* index into the netmap ring */
378 	u_int nic_i;	/* index into the NIC ring */
398 	 * nm_i is the index of the next free slot in the netmap ring,
399 	 * nic_i is the index of the next received packet in the NIC ring,
401 	 * in netmap mode. For the receive ring we have
408 	 * rxr->next_to_check is set to 0 on a ring reinit
422 			ring->slot[nm_i].len = le16toh(curr->wb.upper.length) - crclen;
423 			ring->slot[nm_i].flags = 0;
445 	 * As usual nm_i is the index in the netmap ring,
446 	 * nic_i is the index in the NIC ring, and
453 			struct netmap_slot *slot = &ring->slot[nm_i];
480 		 * IMPORTANT: we must leave one free slot in the ring,