intel/iavf/iavf_txrx.h

1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright(c) 2013 - 2018 Intel Corporation. */
32  * the value of the rate limit is non-zero
38 #define IAVF_INTRL_8K              125     /* 8000 ints/sec */
39 #define IAVF_INTRL_62K             16      /* 62500 ints/sec */
40 #define IAVF_INTRL_83K             12      /* 83333 ints/sec */
86  * iavf_test_staterr - tests bits in Rx descriptor status and error fields
98 	return !!(rx_desc->wb.qword1.status_error_len &  in iavf_test_staterr()
106 		if ((i) == (r)->count)		\
108 		r->next_to_clean = i;		\
114 		if ((i) == (r)->count)		\
128 /* The size limit for a transmit buffer in a descriptor is (16K - 1).
133 #define IAVF_MAX_DATA_PER_TXD		(16 * 1024 - 1)
135 	(IAVF_MAX_DATA_PER_TXD & ~(IAVF_MAX_READ_REQ_SIZE - 1))
138  * iavf_txd_use_count  - estimate the number of descriptors needed for Tx
143  * though each descriptor can take up to 16K - 1 bytes of aligned memory.
154  * accurate as we have 4K - 1 of wiggle room that we can fit into the last
170 /* Tx Descriptors needed, worst case */
240 		struct device *dev;	/* Used on Tx for DMA mapping */
281 	int prev_pkt_ctr;		/* For Tx stall detection */
320 	for (pos = (head).ring; pos != NULL; pos = pos->next)
334  * iavf_xmit_descriptor_count - calculate number of Tx descriptors needed
343 	const skb_frag_t *frag = &skb_shinfo(skb)->frags[0];  in iavf_xmit_descriptor_count()
344 	unsigned int nr_frags = skb_shinfo(skb)->nr_frags;  in iavf_xmit_descriptor_count()
350 		if (!nr_frags--)  in iavf_xmit_descriptor_count()
360  * iavf_maybe_stop_tx - 1st level check for Tx stop conditions
374  * iavf_chk_linearize - Check if there are more than 8 fragments per packet
378  * Note: Our HW can't scatter-gather more than 8 fragments to build
395  * txring_txq - helper to convert from a ring to a queue
396  * @ring: Tx ring to find the netdev equivalent of
400 	return netdev_get_tx_queue(ring->netdev, ring->queue_index);  in txring_txq()