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linux/drivers/net/ethernet/sfc/ef100_rx.c
Edward Cree 36df6136a7 sfc: add ability for extra channels to receive raw RX buffers
The TC extra channel will need its own special RX handling, which must
 operate before any code that expects the RX buffer to contain a network
 packet; buffers on this RX queue contain MAE counter packets in a
 special format that does not resemble an Ethernet frame, and many fields
 of the RX packet prefix are not populated.
The USER_MARK field, however, is populated with the generation count from
 the counter subsystem, which needs to be passed on to the RX handler.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-11-16 09:07:02 +00:00

222 lines
6.3 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/****************************************************************************
* Driver for Solarflare network controllers and boards
* Copyright 2005-2019 Solarflare Communications Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, incorporated herein by reference.
*/
#include "net_driver.h"
#include "ef100_rx.h"
#include "rx_common.h"
#include "efx.h"
#include "nic_common.h"
#include "mcdi_functions.h"
#include "ef100_regs.h"
#include "ef100_nic.h"
#include "io.h"
/* Get the value of a field in the RX prefix */
#define PREFIX_OFFSET_W(_f) (ESF_GZ_RX_PREFIX_ ## _f ## _LBN / 32)
#define PREFIX_OFFSET_B(_f) (ESF_GZ_RX_PREFIX_ ## _f ## _LBN % 32)
#define PREFIX_WIDTH_MASK(_f) ((1ULL << ESF_GZ_RX_PREFIX_ ## _f ## _WIDTH) - 1)
#define PREFIX_WORD(_p, _f) le32_to_cpu((__force __le32)(_p)[PREFIX_OFFSET_W(_f)])
#define PREFIX_FIELD(_p, _f) ((PREFIX_WORD(_p, _f) >> PREFIX_OFFSET_B(_f)) & \
PREFIX_WIDTH_MASK(_f))
#define ESF_GZ_RX_PREFIX_NT_OR_INNER_L3_CLASS_LBN \
(ESF_GZ_RX_PREFIX_CLASS_LBN + ESF_GZ_RX_PREFIX_HCLASS_NT_OR_INNER_L3_CLASS_LBN)
#define ESF_GZ_RX_PREFIX_NT_OR_INNER_L3_CLASS_WIDTH \
ESF_GZ_RX_PREFIX_HCLASS_NT_OR_INNER_L3_CLASS_WIDTH
bool ef100_rx_buf_hash_valid(const u8 *prefix)
{
return PREFIX_FIELD(prefix, RSS_HASH_VALID);
}
static bool ef100_has_fcs_error(struct efx_channel *channel, u32 *prefix)
{
u16 rxclass;
u8 l2status;
rxclass = le16_to_cpu((__force __le16)PREFIX_FIELD(prefix, CLASS));
l2status = PREFIX_FIELD(&rxclass, HCLASS_L2_STATUS);
if (likely(l2status == ESE_GZ_RH_HCLASS_L2_STATUS_OK))
/* Everything is ok */
return false;
if (l2status == ESE_GZ_RH_HCLASS_L2_STATUS_FCS_ERR)
channel->n_rx_eth_crc_err++;
return true;
}
void __ef100_rx_packet(struct efx_channel *channel)
{
struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel);
struct efx_rx_buffer *rx_buf = efx_rx_buffer(rx_queue,
channel->rx_pkt_index);
struct efx_nic *efx = channel->efx;
struct ef100_nic_data *nic_data;
u8 *eh = efx_rx_buf_va(rx_buf);
__wsum csum = 0;
u16 ing_port;
u32 *prefix;
prefix = (u32 *)(eh - ESE_GZ_RX_PKT_PREFIX_LEN);
if (channel->type->receive_raw) {
u32 mark = PREFIX_FIELD(prefix, USER_MARK);
if (channel->type->receive_raw(rx_queue, mark))
return; /* packet was consumed */
}
if (ef100_has_fcs_error(channel, prefix) &&
unlikely(!(efx->net_dev->features & NETIF_F_RXALL)))
goto out;
rx_buf->len = le16_to_cpu((__force __le16)PREFIX_FIELD(prefix, LENGTH));
if (rx_buf->len <= sizeof(struct ethhdr)) {
if (net_ratelimit())
netif_err(channel->efx, rx_err, channel->efx->net_dev,
"RX packet too small (%d)\n", rx_buf->len);
++channel->n_rx_frm_trunc;
goto out;
}
ing_port = le16_to_cpu((__force __le16) PREFIX_FIELD(prefix, INGRESS_MPORT));
nic_data = efx->nic_data;
if (nic_data->have_mport && ing_port != nic_data->base_mport) {
#ifdef CONFIG_SFC_SRIOV
struct efx_rep *efv;
rcu_read_lock();
efv = efx_ef100_find_rep_by_mport(efx, ing_port);
if (efv) {
if (efv->net_dev->flags & IFF_UP)
efx_ef100_rep_rx_packet(efv, rx_buf);
rcu_read_unlock();
/* Representor Rx doesn't care about PF Rx buffer
* ownership, it just makes a copy. So, we are done
* with the Rx buffer from PF point of view and should
* free it.
*/
goto free_rx_buffer;
}
rcu_read_unlock();
#endif
if (net_ratelimit())
netif_warn(efx, drv, efx->net_dev,
"Unrecognised ing_port %04x (base %04x), dropping\n",
ing_port, nic_data->base_mport);
channel->n_rx_mport_bad++;
goto free_rx_buffer;
}
if (likely(efx->net_dev->features & NETIF_F_RXCSUM)) {
if (PREFIX_FIELD(prefix, NT_OR_INNER_L3_CLASS) == 1) {
++channel->n_rx_ip_hdr_chksum_err;
} else {
u16 sum = be16_to_cpu((__force __be16)PREFIX_FIELD(prefix, CSUM_FRAME));
csum = (__force __wsum) sum;
}
}
if (channel->type->receive_skb) {
/* no support for special channels yet, so just discard */
WARN_ON_ONCE(1);
goto free_rx_buffer;
}
efx_rx_packet_gro(channel, rx_buf, channel->rx_pkt_n_frags, eh, csum);
goto out;
free_rx_buffer:
efx_free_rx_buffers(rx_queue, rx_buf, 1);
out:
channel->rx_pkt_n_frags = 0;
}
static void ef100_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index)
{
struct efx_rx_buffer *rx_buf = efx_rx_buffer(rx_queue, index);
struct efx_channel *channel = efx_rx_queue_channel(rx_queue);
struct efx_nic *efx = rx_queue->efx;
++rx_queue->rx_packets;
netif_vdbg(efx, rx_status, efx->net_dev,
"RX queue %d received id %x\n",
efx_rx_queue_index(rx_queue), index);
efx_sync_rx_buffer(efx, rx_buf, efx->rx_dma_len);
prefetch(efx_rx_buf_va(rx_buf));
rx_buf->page_offset += efx->rx_prefix_size;
efx_recycle_rx_pages(channel, rx_buf, 1);
efx_rx_flush_packet(channel);
channel->rx_pkt_n_frags = 1;
channel->rx_pkt_index = index;
}
void efx_ef100_ev_rx(struct efx_channel *channel, const efx_qword_t *p_event)
{
struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel);
unsigned int n_packets =
EFX_QWORD_FIELD(*p_event, ESF_GZ_EV_RXPKTS_NUM_PKT);
int i;
WARN_ON_ONCE(!n_packets);
if (n_packets > 1)
++channel->n_rx_merge_events;
channel->irq_mod_score += 2 * n_packets;
for (i = 0; i < n_packets; ++i) {
ef100_rx_packet(rx_queue,
rx_queue->removed_count & rx_queue->ptr_mask);
++rx_queue->removed_count;
}
}
void ef100_rx_write(struct efx_rx_queue *rx_queue)
{
unsigned int notified_count = rx_queue->notified_count;
struct efx_rx_buffer *rx_buf;
unsigned int idx;
efx_qword_t *rxd;
efx_dword_t rxdb;
while (notified_count != rx_queue->added_count) {
idx = notified_count & rx_queue->ptr_mask;
rx_buf = efx_rx_buffer(rx_queue, idx);
rxd = efx_rx_desc(rx_queue, idx);
EFX_POPULATE_QWORD_1(*rxd, ESF_GZ_RX_BUF_ADDR, rx_buf->dma_addr);
++notified_count;
}
if (notified_count == rx_queue->notified_count)
return;
wmb();
EFX_POPULATE_DWORD_1(rxdb, ERF_GZ_RX_RING_PIDX,
rx_queue->added_count & rx_queue->ptr_mask);
efx_writed_page(rx_queue->efx, &rxdb,
ER_GZ_RX_RING_DOORBELL, efx_rx_queue_index(rx_queue));
if (rx_queue->grant_credits)
wmb();
rx_queue->notified_count = notified_count;
if (rx_queue->grant_credits)
schedule_work(&rx_queue->grant_work);
}