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Release 4.11 drivers/net/ethernet/amazon/ena/ena_eth_com.c

/*
 * Copyright 2015 Amazon.com, Inc. or its affiliates.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * BSD license below:
 *
 *     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.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#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; }

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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; }

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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); }

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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); }

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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; }

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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)) { pr_err("Push buffer header ptr is NULL\n"); return -EINVAL; } memcpy_toio(dev_head_addr, head_src, header_len); return 0; }

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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); }

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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; pr_debug("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; }

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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; }

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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); }

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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; pr_debug("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); }

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/*****************************************************************************/ /***************************** 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; 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)) { pr_err("Not enough space in the tx queue\n"); return -ENOMEM; } if (unlikely(header_len > io_sq->tx_max_header_size)) { pr_err("header size is too large %d max header: %d\n", header_len, io_sq->tx_max_header_size); return -EINVAL; } /* 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 = max_t(u16, num_bufs, 1); total_desc += have_meta ? 1 : 0; *nb_hw_desc = total_desc; return 0; }

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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; 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; } pr_debug("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)) { pr_err("Too many RX cdescs (%d) > MAX(%d)\n", nb_hw_desc, ena_rx_ctx->max_bufs); return -ENOSPC; } 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; pr_debug("[%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; }

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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; WARN(io_sq->direction != ENA_COM_IO_QUEUE_DIRECTION_RX, "wrong Q type"); if (unlikely(ena_com_sq_empty_space(io_sq) == 0)) return -ENOSPC; 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; }

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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 -EAGAIN; ena_com_cq_inc_head(io_cq); *req_id = READ_ONCE(cdesc->req_id); return 0; }

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