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net: ena: add support for the rx offset feature

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Newer ENA devices can write data to rx buffers with an offset
from the beginning of the buffer.

This commit adds support for this feature in the driver.

Signed-off-by: Sameeh Jubran <sameehj@amazon.com>
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arthur Kiyanovski 2020-05-22 12:08:52 +03:00 committed by David S. Miller
parent b79f91f157
commit 68f236df93
5 changed files with 28 additions and 8 deletions
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5
drivers/net/ethernet/amazon/ena/ena_admin_defs.h
View File

@ -813,7 +813,8 @@ struct ena_admin_host_info {
u16 reserved;
/* 1 :0 : reserved
/* 0 : reserved
* 1 : rx_offset
* 2 : interrupt_moderation
* 31:3 : reserved
*/
@ -1124,6 +1125,8 @@ struct ena_admin_ena_mmio_req_read_less_resp {
#define ENA_ADMIN_HOST_INFO_DEVICE_MASK GENMASK(7, 3)
#define ENA_ADMIN_HOST_INFO_BUS_SHIFT 8
#define ENA_ADMIN_HOST_INFO_BUS_MASK GENMASK(15, 8)
#define ENA_ADMIN_HOST_INFO_RX_OFFSET_SHIFT 1
#define ENA_ADMIN_HOST_INFO_RX_OFFSET_MASK BIT(1)
#define ENA_ADMIN_HOST_INFO_INTERRUPT_MODERATION_SHIFT 2
#define ENA_ADMIN_HOST_INFO_INTERRUPT_MODERATION_MASK BIT(2)

18
drivers/net/ethernet/amazon/ena/ena_eth_com.c
View File

@ -519,7 +519,7 @@ int ena_com_rx_pkt(struct ena_com_io_cq *io_cq,
struct ena_eth_io_rx_cdesc_base *cdesc = NULL;
u16 cdesc_idx = 0;
u16 nb_hw_desc;
u16 i;
u16 i = 0;
WARN(io_cq->direction != ENA_COM_IO_QUEUE_DIRECTION_RX, "wrong Q type");
@ -538,13 +538,19 @@ int ena_com_rx_pkt(struct ena_com_io_cq *io_cq,
return -ENOSPC;
}
for (i = 0; i < nb_hw_desc; i++) {
cdesc = ena_com_rx_cdesc_idx_to_ptr(io_cq, cdesc_idx);
ena_rx_ctx->pkt_offset = cdesc->offset;
do {
ena_buf[i].len = cdesc->length;
ena_buf[i].req_id = cdesc->req_id;
if (++i >= nb_hw_desc)
break;
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++;
}
} while (1);
/* Update SQ head ptr */
io_sq->next_to_comp += nb_hw_desc;

1
drivers/net/ethernet/amazon/ena/ena_eth_com.h
View File

@ -73,6 +73,7 @@ struct ena_com_rx_ctx {
u32 hash;
u16 descs;
int max_bufs;
u8 pkt_offset;
};
int ena_com_prepare_tx(struct ena_com_io_sq *io_sq,

4
drivers/net/ethernet/amazon/ena/ena_eth_io_defs.h
View File

@ -264,7 +264,9 @@ struct ena_eth_io_rx_cdesc_base {
u16 sub_qid;
u16 reserved;
u8 offset;
u8 reserved;
};
/* 8-word format */

8
drivers/net/ethernet/amazon/ena/ena_netdev.c
View File

@ -1435,6 +1435,8 @@ static struct sk_buff *ena_rx_skb(struct ena_ring *rx_ring,
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_info->page,
rx_info->page_offset, len, ENA_PAGE_SIZE);
/* The offset is non zero only for the first buffer */
rx_info->page_offset = 0;
netif_dbg(rx_ring->adapter, rx_status, rx_ring->netdev,
"rx skb updated. len %d. data_len %d\n",
@ -1590,6 +1592,7 @@ static int ena_clean_rx_irq(struct ena_ring *rx_ring, struct napi_struct *napi,
{
u16 next_to_clean = rx_ring->next_to_clean;
struct ena_com_rx_ctx ena_rx_ctx;
struct ena_rx_buffer *rx_info;
struct ena_adapter *adapter;
u32 res_budget, work_done;
int rx_copybreak_pkt = 0;
@ -1614,6 +1617,7 @@ static int ena_clean_rx_irq(struct ena_ring *rx_ring, struct napi_struct *napi,
ena_rx_ctx.ena_bufs = rx_ring->ena_bufs;
ena_rx_ctx.max_bufs = rx_ring->sgl_size;
ena_rx_ctx.descs = 0;
ena_rx_ctx.pkt_offset = 0;
rc = ena_com_rx_pkt(rx_ring->ena_com_io_cq,
rx_ring->ena_com_io_sq,
&ena_rx_ctx);
@ -1623,6 +1627,9 @@ static int ena_clean_rx_irq(struct ena_ring *rx_ring, struct napi_struct *napi,
if (unlikely(ena_rx_ctx.descs == 0))
break;
rx_info = &rx_ring->rx_buffer_info[rx_ring->ena_bufs[0].req_id];
rx_info->page_offset = ena_rx_ctx.pkt_offset;
netif_dbg(rx_ring->adapter, rx_status, rx_ring->netdev,
"rx_poll: q %d got packet from ena. descs #: %d l3 proto %d l4 proto %d hash: %x\n",
rx_ring->qid, ena_rx_ctx.descs, ena_rx_ctx.l3_proto,
@ -3111,6 +3118,7 @@ static void ena_config_host_info(struct ena_com_dev *ena_dev,
host_info->num_cpus = num_online_cpus();
host_info->driver_supported_features =
ENA_ADMIN_HOST_INFO_RX_OFFSET_MASK |
ENA_ADMIN_HOST_INFO_INTERRUPT_MODERATION_MASK;
rc = ena_com_set_host_attributes(ena_dev);