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authorZbigniew Bodek <zbb@FreeBSD.org>2017-04-27 19:40:53 +0000
committerZbigniew Bodek <zbb@FreeBSD.org>2017-04-27 19:40:53 +0000
commite1593b114ffa9fede0111ea3c21665c9e5d71014 (patch)
tree8a9db2f9bebc2bdbd646b5c097d5b404ca98b274 /ena_eth_com.c
downloadsrc-e1593b114ffa9fede0111ea3c21665c9e5d71014.tar.gz
src-e1593b114ffa9fede0111ea3c21665c9e5d71014.zip
Introduce HAL for Amazon Elastic Network Adapter (ENA)vendor/ena-com/1.1.4.1
This commit adds HAL (Hardware Abstraction Layer) code for Amazon Elastic Network Adapter (ENA). Version: 1.1.4.1 Obtained from: Amazon.com, Inc.
Notes
Notes: svn path=/vendor-sys/ena-com/1.1.4.1/; revision=317516; tag=vendor/ena-com/1.1.4.1
Diffstat (limited to 'ena_eth_com.c')
-rw-r--r--ena_eth_com.c509
1 files changed, 509 insertions, 0 deletions
diff --git a/ena_eth_com.c b/ena_eth_com.c
new file mode 100644
index 000000000000..fbf561e1637b
--- /dev/null
+++ b/ena_eth_com.c
@@ -0,0 +1,509 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright (c) 2015-2017 Amazon.com, Inc. or its affiliates.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ena_eth_com.h"
+
+static inline struct ena_eth_io_rx_cdesc_base *ena_com_get_next_rx_cdesc(
+ struct ena_com_io_cq *io_cq)
+{
+ struct ena_eth_io_rx_cdesc_base *cdesc;
+ u16 expected_phase, head_masked;
+ u16 desc_phase;
+
+ head_masked = io_cq->head & (io_cq->q_depth - 1);
+ expected_phase = io_cq->phase;
+
+ cdesc = (struct ena_eth_io_rx_cdesc_base *)(io_cq->cdesc_addr.virt_addr
+ + (head_masked * io_cq->cdesc_entry_size_in_bytes));
+
+ desc_phase = (READ_ONCE(cdesc->status) & ENA_ETH_IO_RX_CDESC_BASE_PHASE_MASK) >>
+ ENA_ETH_IO_RX_CDESC_BASE_PHASE_SHIFT;
+
+ if (desc_phase != expected_phase)
+ return NULL;
+
+ return cdesc;
+}
+
+static inline void ena_com_cq_inc_head(struct ena_com_io_cq *io_cq)
+{
+ io_cq->head++;
+
+ /* Switch phase bit in case of wrap around */
+ if (unlikely((io_cq->head & (io_cq->q_depth - 1)) == 0))
+ io_cq->phase ^= 1;
+}
+
+static inline void *get_sq_desc(struct ena_com_io_sq *io_sq)
+{
+ u16 tail_masked;
+ u32 offset;
+
+ tail_masked = io_sq->tail & (io_sq->q_depth - 1);
+
+ offset = tail_masked * io_sq->desc_entry_size;
+
+ return (void *)((uintptr_t)io_sq->desc_addr.virt_addr + offset);
+}
+
+static inline void ena_com_copy_curr_sq_desc_to_dev(struct ena_com_io_sq *io_sq)
+{
+ u16 tail_masked = io_sq->tail & (io_sq->q_depth - 1);
+ u32 offset = tail_masked * io_sq->desc_entry_size;
+
+ /* In case this queue isn't a LLQ */
+ if (io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_HOST)
+ return;
+
+ memcpy_toio(io_sq->desc_addr.pbuf_dev_addr + offset,
+ io_sq->desc_addr.virt_addr + offset,
+ io_sq->desc_entry_size);
+}
+
+static inline void ena_com_sq_update_tail(struct ena_com_io_sq *io_sq)
+{
+ io_sq->tail++;
+
+ /* Switch phase bit in case of wrap around */
+ if (unlikely((io_sq->tail & (io_sq->q_depth - 1)) == 0))
+ io_sq->phase ^= 1;
+}
+
+static inline int ena_com_write_header(struct ena_com_io_sq *io_sq,
+ u8 *head_src, u16 header_len)
+{
+ u16 tail_masked = io_sq->tail & (io_sq->q_depth - 1);
+ u8 __iomem *dev_head_addr =
+ io_sq->header_addr + (tail_masked * io_sq->tx_max_header_size);
+
+ if (io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_HOST)
+ return 0;
+
+ if (unlikely(!io_sq->header_addr)) {
+ ena_trc_err("Push buffer header ptr is NULL\n");
+ return ENA_COM_INVAL;
+ }
+
+ memcpy_toio(dev_head_addr, head_src, header_len);
+
+ return 0;
+}
+
+static inline struct ena_eth_io_rx_cdesc_base *
+ ena_com_rx_cdesc_idx_to_ptr(struct ena_com_io_cq *io_cq, u16 idx)
+{
+ idx &= (io_cq->q_depth - 1);
+ return (struct ena_eth_io_rx_cdesc_base *)
+ ((uintptr_t)io_cq->cdesc_addr.virt_addr +
+ idx * io_cq->cdesc_entry_size_in_bytes);
+}
+
+static inline u16 ena_com_cdesc_rx_pkt_get(struct ena_com_io_cq *io_cq,
+ u16 *first_cdesc_idx)
+{
+ struct ena_eth_io_rx_cdesc_base *cdesc;
+ u16 count = 0, head_masked;
+ u32 last = 0;
+
+ do {
+ cdesc = ena_com_get_next_rx_cdesc(io_cq);
+ if (!cdesc)
+ break;
+
+ ena_com_cq_inc_head(io_cq);
+ count++;
+ last = (READ_ONCE(cdesc->status) & ENA_ETH_IO_RX_CDESC_BASE_LAST_MASK) >>
+ ENA_ETH_IO_RX_CDESC_BASE_LAST_SHIFT;
+ } while (!last);
+
+ if (last) {
+ *first_cdesc_idx = io_cq->cur_rx_pkt_cdesc_start_idx;
+ count += io_cq->cur_rx_pkt_cdesc_count;
+
+ head_masked = io_cq->head & (io_cq->q_depth - 1);
+
+ io_cq->cur_rx_pkt_cdesc_count = 0;
+ io_cq->cur_rx_pkt_cdesc_start_idx = head_masked;
+
+ ena_trc_dbg("ena q_id: %d packets were completed. first desc idx %u descs# %d\n",
+ io_cq->qid, *first_cdesc_idx, count);
+ } else {
+ io_cq->cur_rx_pkt_cdesc_count += count;
+ count = 0;
+ }
+
+ return count;
+}
+
+static inline bool ena_com_meta_desc_changed(struct ena_com_io_sq *io_sq,
+ struct ena_com_tx_ctx *ena_tx_ctx)
+{
+ int rc;
+
+ if (ena_tx_ctx->meta_valid) {
+ rc = memcmp(&io_sq->cached_tx_meta,
+ &ena_tx_ctx->ena_meta,
+ sizeof(struct ena_com_tx_meta));
+
+ if (unlikely(rc != 0))
+ return true;
+ }
+
+ return false;
+}
+
+static inline void ena_com_create_and_store_tx_meta_desc(struct ena_com_io_sq *io_sq,
+ struct ena_com_tx_ctx *ena_tx_ctx)
+{
+ struct ena_eth_io_tx_meta_desc *meta_desc = NULL;
+ struct ena_com_tx_meta *ena_meta = &ena_tx_ctx->ena_meta;
+
+ meta_desc = get_sq_desc(io_sq);
+ memset(meta_desc, 0x0, sizeof(struct ena_eth_io_tx_meta_desc));
+
+ meta_desc->len_ctrl |= ENA_ETH_IO_TX_META_DESC_META_DESC_MASK;
+
+ meta_desc->len_ctrl |= ENA_ETH_IO_TX_META_DESC_EXT_VALID_MASK;
+
+ /* bits 0-9 of the mss */
+ meta_desc->word2 |= (ena_meta->mss <<
+ ENA_ETH_IO_TX_META_DESC_MSS_LO_SHIFT) &
+ ENA_ETH_IO_TX_META_DESC_MSS_LO_MASK;
+ /* bits 10-13 of the mss */
+ meta_desc->len_ctrl |= ((ena_meta->mss >> 10) <<
+ ENA_ETH_IO_TX_META_DESC_MSS_HI_SHIFT) &
+ ENA_ETH_IO_TX_META_DESC_MSS_HI_MASK;
+
+ /* Extended meta desc */
+ meta_desc->len_ctrl |= ENA_ETH_IO_TX_META_DESC_ETH_META_TYPE_MASK;
+ meta_desc->len_ctrl |= ENA_ETH_IO_TX_META_DESC_META_STORE_MASK;
+ meta_desc->len_ctrl |= (io_sq->phase <<
+ ENA_ETH_IO_TX_META_DESC_PHASE_SHIFT) &
+ ENA_ETH_IO_TX_META_DESC_PHASE_MASK;
+
+ meta_desc->len_ctrl |= ENA_ETH_IO_TX_META_DESC_FIRST_MASK;
+ meta_desc->word2 |= ena_meta->l3_hdr_len &
+ ENA_ETH_IO_TX_META_DESC_L3_HDR_LEN_MASK;
+ meta_desc->word2 |= (ena_meta->l3_hdr_offset <<
+ ENA_ETH_IO_TX_META_DESC_L3_HDR_OFF_SHIFT) &
+ ENA_ETH_IO_TX_META_DESC_L3_HDR_OFF_MASK;
+
+ meta_desc->word2 |= (ena_meta->l4_hdr_len <<
+ ENA_ETH_IO_TX_META_DESC_L4_HDR_LEN_IN_WORDS_SHIFT) &
+ ENA_ETH_IO_TX_META_DESC_L4_HDR_LEN_IN_WORDS_MASK;
+
+ meta_desc->len_ctrl |= ENA_ETH_IO_TX_META_DESC_META_STORE_MASK;
+
+ /* Cached the meta desc */
+ memcpy(&io_sq->cached_tx_meta, ena_meta,
+ sizeof(struct ena_com_tx_meta));
+
+ ena_com_copy_curr_sq_desc_to_dev(io_sq);
+ ena_com_sq_update_tail(io_sq);
+}
+
+static inline void ena_com_rx_set_flags(struct ena_com_rx_ctx *ena_rx_ctx,
+ struct ena_eth_io_rx_cdesc_base *cdesc)
+{
+ ena_rx_ctx->l3_proto = cdesc->status &
+ ENA_ETH_IO_RX_CDESC_BASE_L3_PROTO_IDX_MASK;
+ ena_rx_ctx->l4_proto =
+ (cdesc->status & ENA_ETH_IO_RX_CDESC_BASE_L4_PROTO_IDX_MASK) >>
+ ENA_ETH_IO_RX_CDESC_BASE_L4_PROTO_IDX_SHIFT;
+ ena_rx_ctx->l3_csum_err =
+ (cdesc->status & ENA_ETH_IO_RX_CDESC_BASE_L3_CSUM_ERR_MASK) >>
+ ENA_ETH_IO_RX_CDESC_BASE_L3_CSUM_ERR_SHIFT;
+ ena_rx_ctx->l4_csum_err =
+ (cdesc->status & ENA_ETH_IO_RX_CDESC_BASE_L4_CSUM_ERR_MASK) >>
+ ENA_ETH_IO_RX_CDESC_BASE_L4_CSUM_ERR_SHIFT;
+ ena_rx_ctx->hash = cdesc->hash;
+ ena_rx_ctx->frag =
+ (cdesc->status & ENA_ETH_IO_RX_CDESC_BASE_IPV4_FRAG_MASK) >>
+ ENA_ETH_IO_RX_CDESC_BASE_IPV4_FRAG_SHIFT;
+
+ ena_trc_dbg("ena_rx_ctx->l3_proto %d ena_rx_ctx->l4_proto %d\nena_rx_ctx->l3_csum_err %d ena_rx_ctx->l4_csum_err %d\nhash frag %d frag: %d cdesc_status: %x\n",
+ ena_rx_ctx->l3_proto,
+ ena_rx_ctx->l4_proto,
+ ena_rx_ctx->l3_csum_err,
+ ena_rx_ctx->l4_csum_err,
+ ena_rx_ctx->hash,
+ ena_rx_ctx->frag,
+ cdesc->status);
+}
+
+/*****************************************************************************/
+/***************************** API **********************************/
+/*****************************************************************************/
+
+int ena_com_prepare_tx(struct ena_com_io_sq *io_sq,
+ struct ena_com_tx_ctx *ena_tx_ctx,
+ int *nb_hw_desc)
+{
+ struct ena_eth_io_tx_desc *desc = NULL;
+ struct ena_com_buf *ena_bufs = ena_tx_ctx->ena_bufs;
+ void *push_header = ena_tx_ctx->push_header;
+ u16 header_len = ena_tx_ctx->header_len;
+ u16 num_bufs = ena_tx_ctx->num_bufs;
+ int total_desc, i, rc;
+ bool have_meta;
+ u64 addr_hi;
+
+ ENA_WARN(io_sq->direction != ENA_COM_IO_QUEUE_DIRECTION_TX,
+ "wrong Q type");
+
+ /* num_bufs +1 for potential meta desc */
+ if (ena_com_sq_empty_space(io_sq) < (num_bufs + 1)) {
+ ena_trc_err("Not enough space in the tx queue\n");
+ return ENA_COM_NO_MEM;
+ }
+
+ if (unlikely(header_len > io_sq->tx_max_header_size)) {
+ ena_trc_err("header size is too large %d max header: %d\n",
+ header_len, io_sq->tx_max_header_size);
+ return ENA_COM_INVAL;
+ }
+
+ /* start with pushing the header (if needed) */
+ rc = ena_com_write_header(io_sq, push_header, header_len);
+ if (unlikely(rc))
+ return rc;
+
+ have_meta = ena_tx_ctx->meta_valid && ena_com_meta_desc_changed(io_sq,
+ ena_tx_ctx);
+ if (have_meta)
+ ena_com_create_and_store_tx_meta_desc(io_sq, ena_tx_ctx);
+
+ /* If the caller doesn't want send packets */
+ if (unlikely(!num_bufs && !header_len)) {
+ *nb_hw_desc = have_meta ? 0 : 1;
+ return 0;
+ }
+
+ desc = get_sq_desc(io_sq);
+ memset(desc, 0x0, sizeof(struct ena_eth_io_tx_desc));
+
+ /* Set first desc when we don't have meta descriptor */
+ if (!have_meta)
+ desc->len_ctrl |= ENA_ETH_IO_TX_DESC_FIRST_MASK;
+
+ desc->buff_addr_hi_hdr_sz |= (header_len <<
+ ENA_ETH_IO_TX_DESC_HEADER_LENGTH_SHIFT) &
+ ENA_ETH_IO_TX_DESC_HEADER_LENGTH_MASK;
+ desc->len_ctrl |= (io_sq->phase << ENA_ETH_IO_TX_DESC_PHASE_SHIFT) &
+ ENA_ETH_IO_TX_DESC_PHASE_MASK;
+
+ desc->len_ctrl |= ENA_ETH_IO_TX_DESC_COMP_REQ_MASK;
+
+ /* Bits 0-9 */
+ desc->meta_ctrl |= (ena_tx_ctx->req_id <<
+ ENA_ETH_IO_TX_DESC_REQ_ID_LO_SHIFT) &
+ ENA_ETH_IO_TX_DESC_REQ_ID_LO_MASK;
+
+ desc->meta_ctrl |= (ena_tx_ctx->df <<
+ ENA_ETH_IO_TX_DESC_DF_SHIFT) &
+ ENA_ETH_IO_TX_DESC_DF_MASK;
+
+ /* Bits 10-15 */
+ desc->len_ctrl |= ((ena_tx_ctx->req_id >> 10) <<
+ ENA_ETH_IO_TX_DESC_REQ_ID_HI_SHIFT) &
+ ENA_ETH_IO_TX_DESC_REQ_ID_HI_MASK;
+
+ if (ena_tx_ctx->meta_valid) {
+ desc->meta_ctrl |= (ena_tx_ctx->tso_enable <<
+ ENA_ETH_IO_TX_DESC_TSO_EN_SHIFT) &
+ ENA_ETH_IO_TX_DESC_TSO_EN_MASK;
+ desc->meta_ctrl |= ena_tx_ctx->l3_proto &
+ ENA_ETH_IO_TX_DESC_L3_PROTO_IDX_MASK;
+ desc->meta_ctrl |= (ena_tx_ctx->l4_proto <<
+ ENA_ETH_IO_TX_DESC_L4_PROTO_IDX_SHIFT) &
+ ENA_ETH_IO_TX_DESC_L4_PROTO_IDX_MASK;
+ desc->meta_ctrl |= (ena_tx_ctx->l3_csum_enable <<
+ ENA_ETH_IO_TX_DESC_L3_CSUM_EN_SHIFT) &
+ ENA_ETH_IO_TX_DESC_L3_CSUM_EN_MASK;
+ desc->meta_ctrl |= (ena_tx_ctx->l4_csum_enable <<
+ ENA_ETH_IO_TX_DESC_L4_CSUM_EN_SHIFT) &
+ ENA_ETH_IO_TX_DESC_L4_CSUM_EN_MASK;
+ desc->meta_ctrl |= (ena_tx_ctx->l4_csum_partial <<
+ ENA_ETH_IO_TX_DESC_L4_CSUM_PARTIAL_SHIFT) &
+ ENA_ETH_IO_TX_DESC_L4_CSUM_PARTIAL_MASK;
+ }
+
+ for (i = 0; i < num_bufs; i++) {
+ /* The first desc share the same desc as the header */
+ if (likely(i != 0)) {
+ ena_com_copy_curr_sq_desc_to_dev(io_sq);
+ ena_com_sq_update_tail(io_sq);
+
+ desc = get_sq_desc(io_sq);
+ memset(desc, 0x0, sizeof(struct ena_eth_io_tx_desc));
+
+ desc->len_ctrl |= (io_sq->phase <<
+ ENA_ETH_IO_TX_DESC_PHASE_SHIFT) &
+ ENA_ETH_IO_TX_DESC_PHASE_MASK;
+ }
+
+ desc->len_ctrl |= ena_bufs->len &
+ ENA_ETH_IO_TX_DESC_LENGTH_MASK;
+
+ addr_hi = ((ena_bufs->paddr &
+ GENMASK_ULL(io_sq->dma_addr_bits - 1, 32)) >> 32);
+
+ desc->buff_addr_lo = (u32)ena_bufs->paddr;
+ desc->buff_addr_hi_hdr_sz |= addr_hi &
+ ENA_ETH_IO_TX_DESC_ADDR_HI_MASK;
+ ena_bufs++;
+ }
+
+ /* set the last desc indicator */
+ desc->len_ctrl |= ENA_ETH_IO_TX_DESC_LAST_MASK;
+
+ ena_com_copy_curr_sq_desc_to_dev(io_sq);
+
+ ena_com_sq_update_tail(io_sq);
+
+ total_desc = ENA_MAX16(num_bufs, 1);
+ total_desc += have_meta ? 1 : 0;
+
+ *nb_hw_desc = total_desc;
+ return 0;
+}
+
+int ena_com_rx_pkt(struct ena_com_io_cq *io_cq,
+ struct ena_com_io_sq *io_sq,
+ struct ena_com_rx_ctx *ena_rx_ctx)
+{
+ struct ena_com_rx_buf_info *ena_buf = &ena_rx_ctx->ena_bufs[0];
+ struct ena_eth_io_rx_cdesc_base *cdesc = NULL;
+ u16 cdesc_idx = 0;
+ u16 nb_hw_desc;
+ u16 i;
+
+ ENA_WARN(io_cq->direction != ENA_COM_IO_QUEUE_DIRECTION_RX,
+ "wrong Q type");
+
+ nb_hw_desc = ena_com_cdesc_rx_pkt_get(io_cq, &cdesc_idx);
+ if (nb_hw_desc == 0) {
+ ena_rx_ctx->descs = nb_hw_desc;
+ return 0;
+ }
+
+ ena_trc_dbg("fetch rx packet: queue %d completed desc: %d\n",
+ io_cq->qid, nb_hw_desc);
+
+ if (unlikely(nb_hw_desc > ena_rx_ctx->max_bufs)) {
+ ena_trc_err("Too many RX cdescs (%d) > MAX(%d)\n",
+ nb_hw_desc, ena_rx_ctx->max_bufs);
+ return ENA_COM_NO_SPACE;
+ }
+
+ for (i = 0; i < nb_hw_desc; i++) {
+ cdesc = ena_com_rx_cdesc_idx_to_ptr(io_cq, cdesc_idx + i);
+
+ ena_buf->len = cdesc->length;
+ ena_buf->req_id = cdesc->req_id;
+ ena_buf++;
+ }
+
+ /* Update SQ head ptr */
+ io_sq->next_to_comp += nb_hw_desc;
+
+ ena_trc_dbg("[%s][QID#%d] Updating SQ head to: %d\n", __func__,
+ io_sq->qid, io_sq->next_to_comp);
+
+ /* Get rx flags from the last pkt */
+ ena_com_rx_set_flags(ena_rx_ctx, cdesc);
+
+ ena_rx_ctx->descs = nb_hw_desc;
+ return 0;
+}
+
+int ena_com_add_single_rx_desc(struct ena_com_io_sq *io_sq,
+ struct ena_com_buf *ena_buf,
+ u16 req_id)
+{
+ struct ena_eth_io_rx_desc *desc;
+
+ ENA_WARN(io_sq->direction != ENA_COM_IO_QUEUE_DIRECTION_RX,
+ "wrong Q type");
+
+ if (unlikely(ena_com_sq_empty_space(io_sq) == 0))
+ return ENA_COM_NO_SPACE;
+
+ desc = get_sq_desc(io_sq);
+ memset(desc, 0x0, sizeof(struct ena_eth_io_rx_desc));
+
+ desc->length = ena_buf->len;
+
+ desc->ctrl |= ENA_ETH_IO_RX_DESC_FIRST_MASK;
+ desc->ctrl |= ENA_ETH_IO_RX_DESC_LAST_MASK;
+ desc->ctrl |= io_sq->phase & ENA_ETH_IO_RX_DESC_PHASE_MASK;
+ desc->ctrl |= ENA_ETH_IO_RX_DESC_COMP_REQ_MASK;
+
+ desc->req_id = req_id;
+
+ desc->buff_addr_lo = (u32)ena_buf->paddr;
+ desc->buff_addr_hi =
+ ((ena_buf->paddr & GENMASK_ULL(io_sq->dma_addr_bits - 1, 32)) >> 32);
+
+ ena_com_sq_update_tail(io_sq);
+
+ return 0;
+}
+
+int ena_com_tx_comp_req_id_get(struct ena_com_io_cq *io_cq, u16 *req_id)
+{
+ u8 expected_phase, cdesc_phase;
+ struct ena_eth_io_tx_cdesc *cdesc;
+ u16 masked_head;
+
+ masked_head = io_cq->head & (io_cq->q_depth - 1);
+ expected_phase = io_cq->phase;
+
+ cdesc = (struct ena_eth_io_tx_cdesc *)
+ ((uintptr_t)io_cq->cdesc_addr.virt_addr +
+ (masked_head * io_cq->cdesc_entry_size_in_bytes));
+
+ /* When the current completion descriptor phase isn't the same as the
+ * expected, it mean that the device still didn't update
+ * this completion.
+ */
+ cdesc_phase = READ_ONCE(cdesc->flags) & ENA_ETH_IO_TX_CDESC_PHASE_MASK;
+ if (cdesc_phase != expected_phase)
+ return ENA_COM_TRY_AGAIN;
+
+ ena_com_cq_inc_head(io_cq);
+
+ *req_id = READ_ONCE(cdesc->req_id);
+
+ return 0;
+}