![Ben Hutchings](/assets/img/avatar_default.png)
Some functions return an error code which is always 0. Change their return types to void and simplify their callers accordingly. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
881 lines
25 KiB
C
881 lines
25 KiB
C
/****************************************************************************
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* Driver for Solarflare Solarstorm network controllers and boards
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* Copyright 2005-2006 Fen Systems Ltd.
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* Copyright 2005-2008 Solarflare Communications Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation, incorporated herein by reference.
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*/
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/tcp.h>
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#include <linux/udp.h>
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#include <net/ip.h>
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#include <net/checksum.h>
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#include "net_driver.h"
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#include "rx.h"
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#include "efx.h"
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#include "falcon.h"
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#include "selftest.h"
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#include "workarounds.h"
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/* Number of RX descriptors pushed at once. */
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#define EFX_RX_BATCH 8
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/* Size of buffer allocated for skb header area. */
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#define EFX_SKB_HEADERS 64u
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/*
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* rx_alloc_method - RX buffer allocation method
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*
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* This driver supports two methods for allocating and using RX buffers:
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* each RX buffer may be backed by an skb or by an order-n page.
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*
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* When LRO is in use then the second method has a lower overhead,
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* since we don't have to allocate then free skbs on reassembled frames.
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*
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* Values:
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* - RX_ALLOC_METHOD_AUTO = 0
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* - RX_ALLOC_METHOD_SKB = 1
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* - RX_ALLOC_METHOD_PAGE = 2
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*
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* The heuristic for %RX_ALLOC_METHOD_AUTO is a simple hysteresis count
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* controlled by the parameters below.
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*
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* - Since pushing and popping descriptors are separated by the rx_queue
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* size, so the watermarks should be ~rxd_size.
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* - The performance win by using page-based allocation for LRO is less
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* than the performance hit of using page-based allocation of non-LRO,
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* so the watermarks should reflect this.
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*
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* Per channel we maintain a single variable, updated by each channel:
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*
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* rx_alloc_level += (lro_performed ? RX_ALLOC_FACTOR_LRO :
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* RX_ALLOC_FACTOR_SKB)
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* Per NAPI poll interval, we constrain rx_alloc_level to 0..MAX (which
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* limits the hysteresis), and update the allocation strategy:
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*
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* rx_alloc_method = (rx_alloc_level > RX_ALLOC_LEVEL_LRO ?
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* RX_ALLOC_METHOD_PAGE : RX_ALLOC_METHOD_SKB)
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*/
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static int rx_alloc_method = RX_ALLOC_METHOD_PAGE;
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#define RX_ALLOC_LEVEL_LRO 0x2000
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#define RX_ALLOC_LEVEL_MAX 0x3000
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#define RX_ALLOC_FACTOR_LRO 1
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#define RX_ALLOC_FACTOR_SKB (-2)
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/* This is the percentage fill level below which new RX descriptors
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* will be added to the RX descriptor ring.
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*/
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static unsigned int rx_refill_threshold = 90;
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/* This is the percentage fill level to which an RX queue will be refilled
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* when the "RX refill threshold" is reached.
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*/
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static unsigned int rx_refill_limit = 95;
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/*
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* RX maximum head room required.
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*
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* This must be at least 1 to prevent overflow and at least 2 to allow
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* pipelined receives.
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*/
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#define EFX_RXD_HEAD_ROOM 2
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static inline unsigned int efx_rx_buf_offset(struct efx_rx_buffer *buf)
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{
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/* Offset is always within one page, so we don't need to consider
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* the page order.
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*/
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return (__force unsigned long) buf->data & (PAGE_SIZE - 1);
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}
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static inline unsigned int efx_rx_buf_size(struct efx_nic *efx)
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{
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return PAGE_SIZE << efx->rx_buffer_order;
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}
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/**************************************************************************
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*
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* Linux generic LRO handling
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*
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**************************************************************************
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*/
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static int efx_lro_get_skb_hdr(struct sk_buff *skb, void **ip_hdr,
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void **tcpudp_hdr, u64 *hdr_flags, void *priv)
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{
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struct efx_channel *channel = priv;
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struct iphdr *iph;
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struct tcphdr *th;
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iph = (struct iphdr *)skb->data;
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if (skb->protocol != htons(ETH_P_IP) || iph->protocol != IPPROTO_TCP)
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goto fail;
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th = (struct tcphdr *)(skb->data + iph->ihl * 4);
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*tcpudp_hdr = th;
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*ip_hdr = iph;
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*hdr_flags = LRO_IPV4 | LRO_TCP;
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channel->rx_alloc_level += RX_ALLOC_FACTOR_LRO;
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return 0;
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fail:
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channel->rx_alloc_level += RX_ALLOC_FACTOR_SKB;
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return -1;
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}
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static int efx_get_frag_hdr(struct skb_frag_struct *frag, void **mac_hdr,
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void **ip_hdr, void **tcpudp_hdr, u64 *hdr_flags,
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void *priv)
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{
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struct efx_channel *channel = priv;
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struct ethhdr *eh;
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struct iphdr *iph;
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/* We support EtherII and VLAN encapsulated IPv4 */
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eh = page_address(frag->page) + frag->page_offset;
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*mac_hdr = eh;
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if (eh->h_proto == htons(ETH_P_IP)) {
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iph = (struct iphdr *)(eh + 1);
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} else {
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struct vlan_ethhdr *veh = (struct vlan_ethhdr *)eh;
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if (veh->h_vlan_encapsulated_proto != htons(ETH_P_IP))
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goto fail;
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iph = (struct iphdr *)(veh + 1);
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}
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*ip_hdr = iph;
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/* We can only do LRO over TCP */
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if (iph->protocol != IPPROTO_TCP)
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goto fail;
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*hdr_flags = LRO_IPV4 | LRO_TCP;
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*tcpudp_hdr = (struct tcphdr *)((u8 *) iph + iph->ihl * 4);
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channel->rx_alloc_level += RX_ALLOC_FACTOR_LRO;
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return 0;
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fail:
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channel->rx_alloc_level += RX_ALLOC_FACTOR_SKB;
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return -1;
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}
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int efx_lro_init(struct net_lro_mgr *lro_mgr, struct efx_nic *efx)
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{
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size_t s = sizeof(struct net_lro_desc) * EFX_MAX_LRO_DESCRIPTORS;
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struct net_lro_desc *lro_arr;
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/* Allocate the LRO descriptors structure */
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lro_arr = kzalloc(s, GFP_KERNEL);
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if (lro_arr == NULL)
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return -ENOMEM;
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lro_mgr->lro_arr = lro_arr;
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lro_mgr->max_desc = EFX_MAX_LRO_DESCRIPTORS;
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lro_mgr->max_aggr = EFX_MAX_LRO_AGGR;
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lro_mgr->frag_align_pad = EFX_PAGE_SKB_ALIGN;
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lro_mgr->get_skb_header = efx_lro_get_skb_hdr;
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lro_mgr->get_frag_header = efx_get_frag_hdr;
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lro_mgr->dev = efx->net_dev;
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lro_mgr->features = LRO_F_NAPI;
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/* We can pass packets up with the checksum intact */
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lro_mgr->ip_summed = CHECKSUM_UNNECESSARY;
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lro_mgr->ip_summed_aggr = CHECKSUM_UNNECESSARY;
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return 0;
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}
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void efx_lro_fini(struct net_lro_mgr *lro_mgr)
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{
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kfree(lro_mgr->lro_arr);
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lro_mgr->lro_arr = NULL;
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}
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/**
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* efx_init_rx_buffer_skb - create new RX buffer using skb-based allocation
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*
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* @rx_queue: Efx RX queue
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* @rx_buf: RX buffer structure to populate
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*
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* This allocates memory for a new receive buffer, maps it for DMA,
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* and populates a struct efx_rx_buffer with the relevant
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* information. Return a negative error code or 0 on success.
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*/
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static int efx_init_rx_buffer_skb(struct efx_rx_queue *rx_queue,
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struct efx_rx_buffer *rx_buf)
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{
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struct efx_nic *efx = rx_queue->efx;
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struct net_device *net_dev = efx->net_dev;
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int skb_len = efx->rx_buffer_len;
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rx_buf->skb = netdev_alloc_skb(net_dev, skb_len);
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if (unlikely(!rx_buf->skb))
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return -ENOMEM;
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/* Adjust the SKB for padding and checksum */
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skb_reserve(rx_buf->skb, NET_IP_ALIGN);
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rx_buf->len = skb_len - NET_IP_ALIGN;
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rx_buf->data = (char *)rx_buf->skb->data;
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rx_buf->skb->ip_summed = CHECKSUM_UNNECESSARY;
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rx_buf->dma_addr = pci_map_single(efx->pci_dev,
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rx_buf->data, rx_buf->len,
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PCI_DMA_FROMDEVICE);
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if (unlikely(pci_dma_mapping_error(efx->pci_dev, rx_buf->dma_addr))) {
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dev_kfree_skb_any(rx_buf->skb);
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rx_buf->skb = NULL;
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return -EIO;
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}
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return 0;
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}
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/**
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* efx_init_rx_buffer_page - create new RX buffer using page-based allocation
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*
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* @rx_queue: Efx RX queue
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* @rx_buf: RX buffer structure to populate
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*
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* This allocates memory for a new receive buffer, maps it for DMA,
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* and populates a struct efx_rx_buffer with the relevant
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* information. Return a negative error code or 0 on success.
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*/
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static int efx_init_rx_buffer_page(struct efx_rx_queue *rx_queue,
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struct efx_rx_buffer *rx_buf)
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{
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struct efx_nic *efx = rx_queue->efx;
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int bytes, space, offset;
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bytes = efx->rx_buffer_len - EFX_PAGE_IP_ALIGN;
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/* If there is space left in the previously allocated page,
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* then use it. Otherwise allocate a new one */
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rx_buf->page = rx_queue->buf_page;
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if (rx_buf->page == NULL) {
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dma_addr_t dma_addr;
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rx_buf->page = alloc_pages(__GFP_COLD | __GFP_COMP | GFP_ATOMIC,
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efx->rx_buffer_order);
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if (unlikely(rx_buf->page == NULL))
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return -ENOMEM;
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dma_addr = pci_map_page(efx->pci_dev, rx_buf->page,
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0, efx_rx_buf_size(efx),
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PCI_DMA_FROMDEVICE);
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if (unlikely(pci_dma_mapping_error(efx->pci_dev, dma_addr))) {
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__free_pages(rx_buf->page, efx->rx_buffer_order);
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rx_buf->page = NULL;
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return -EIO;
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}
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rx_queue->buf_page = rx_buf->page;
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rx_queue->buf_dma_addr = dma_addr;
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rx_queue->buf_data = (page_address(rx_buf->page) +
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EFX_PAGE_IP_ALIGN);
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}
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rx_buf->len = bytes;
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rx_buf->data = rx_queue->buf_data;
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offset = efx_rx_buf_offset(rx_buf);
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rx_buf->dma_addr = rx_queue->buf_dma_addr + offset;
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/* Try to pack multiple buffers per page */
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if (efx->rx_buffer_order == 0) {
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/* The next buffer starts on the next 512 byte boundary */
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rx_queue->buf_data += ((bytes + 0x1ff) & ~0x1ff);
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offset += ((bytes + 0x1ff) & ~0x1ff);
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space = efx_rx_buf_size(efx) - offset;
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if (space >= bytes) {
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/* Refs dropped on kernel releasing each skb */
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get_page(rx_queue->buf_page);
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goto out;
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}
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}
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/* This is the final RX buffer for this page, so mark it for
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* unmapping */
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rx_queue->buf_page = NULL;
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rx_buf->unmap_addr = rx_queue->buf_dma_addr;
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out:
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return 0;
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}
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/* This allocates memory for a new receive buffer, maps it for DMA,
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* and populates a struct efx_rx_buffer with the relevant
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* information.
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*/
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static int efx_init_rx_buffer(struct efx_rx_queue *rx_queue,
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struct efx_rx_buffer *new_rx_buf)
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{
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int rc = 0;
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if (rx_queue->channel->rx_alloc_push_pages) {
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new_rx_buf->skb = NULL;
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rc = efx_init_rx_buffer_page(rx_queue, new_rx_buf);
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rx_queue->alloc_page_count++;
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} else {
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new_rx_buf->page = NULL;
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rc = efx_init_rx_buffer_skb(rx_queue, new_rx_buf);
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rx_queue->alloc_skb_count++;
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}
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if (unlikely(rc < 0))
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EFX_LOG_RL(rx_queue->efx, "%s RXQ[%d] =%d\n", __func__,
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rx_queue->queue, rc);
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return rc;
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}
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static void efx_unmap_rx_buffer(struct efx_nic *efx,
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struct efx_rx_buffer *rx_buf)
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{
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if (rx_buf->page) {
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EFX_BUG_ON_PARANOID(rx_buf->skb);
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if (rx_buf->unmap_addr) {
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pci_unmap_page(efx->pci_dev, rx_buf->unmap_addr,
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efx_rx_buf_size(efx),
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PCI_DMA_FROMDEVICE);
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rx_buf->unmap_addr = 0;
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}
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} else if (likely(rx_buf->skb)) {
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pci_unmap_single(efx->pci_dev, rx_buf->dma_addr,
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rx_buf->len, PCI_DMA_FROMDEVICE);
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}
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}
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static void efx_free_rx_buffer(struct efx_nic *efx,
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struct efx_rx_buffer *rx_buf)
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{
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if (rx_buf->page) {
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__free_pages(rx_buf->page, efx->rx_buffer_order);
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rx_buf->page = NULL;
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} else if (likely(rx_buf->skb)) {
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dev_kfree_skb_any(rx_buf->skb);
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rx_buf->skb = NULL;
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}
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}
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static void efx_fini_rx_buffer(struct efx_rx_queue *rx_queue,
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struct efx_rx_buffer *rx_buf)
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{
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efx_unmap_rx_buffer(rx_queue->efx, rx_buf);
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efx_free_rx_buffer(rx_queue->efx, rx_buf);
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}
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/**
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* efx_fast_push_rx_descriptors - push new RX descriptors quickly
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* @rx_queue: RX descriptor queue
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* @retry: Recheck the fill level
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* This will aim to fill the RX descriptor queue up to
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* @rx_queue->@fast_fill_limit. If there is insufficient atomic
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* memory to do so, the caller should retry.
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*/
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static int __efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue,
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int retry)
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{
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struct efx_rx_buffer *rx_buf;
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unsigned fill_level, index;
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int i, space, rc = 0;
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/* Calculate current fill level. Do this outside the lock,
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* because most of the time we'll end up not wanting to do the
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* fill anyway.
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*/
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fill_level = (rx_queue->added_count - rx_queue->removed_count);
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EFX_BUG_ON_PARANOID(fill_level >
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rx_queue->efx->type->rxd_ring_mask + 1);
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/* Don't fill if we don't need to */
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if (fill_level >= rx_queue->fast_fill_trigger)
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return 0;
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/* Record minimum fill level */
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if (unlikely(fill_level < rx_queue->min_fill)) {
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if (fill_level)
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rx_queue->min_fill = fill_level;
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}
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/* Acquire RX add lock. If this lock is contended, then a fast
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* fill must already be in progress (e.g. in the refill
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* tasklet), so we don't need to do anything
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*/
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if (!spin_trylock_bh(&rx_queue->add_lock))
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return -1;
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retry:
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/* Recalculate current fill level now that we have the lock */
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fill_level = (rx_queue->added_count - rx_queue->removed_count);
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EFX_BUG_ON_PARANOID(fill_level >
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rx_queue->efx->type->rxd_ring_mask + 1);
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space = rx_queue->fast_fill_limit - fill_level;
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if (space < EFX_RX_BATCH)
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goto out_unlock;
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EFX_TRACE(rx_queue->efx, "RX queue %d fast-filling descriptor ring from"
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" level %d to level %d using %s allocation\n",
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rx_queue->queue, fill_level, rx_queue->fast_fill_limit,
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rx_queue->channel->rx_alloc_push_pages ? "page" : "skb");
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do {
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for (i = 0; i < EFX_RX_BATCH; ++i) {
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index = (rx_queue->added_count &
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rx_queue->efx->type->rxd_ring_mask);
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rx_buf = efx_rx_buffer(rx_queue, index);
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rc = efx_init_rx_buffer(rx_queue, rx_buf);
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if (unlikely(rc))
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goto out;
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++rx_queue->added_count;
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}
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} while ((space -= EFX_RX_BATCH) >= EFX_RX_BATCH);
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EFX_TRACE(rx_queue->efx, "RX queue %d fast-filled descriptor ring "
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"to level %d\n", rx_queue->queue,
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rx_queue->added_count - rx_queue->removed_count);
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out:
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/* Send write pointer to card. */
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falcon_notify_rx_desc(rx_queue);
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/* If the fast fill is running inside from the refill tasklet, then
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* for SMP systems it may be running on a different CPU to
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* RX event processing, which means that the fill level may now be
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* out of date. */
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if (unlikely(retry && (rc == 0)))
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goto retry;
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out_unlock:
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spin_unlock_bh(&rx_queue->add_lock);
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return rc;
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}
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/**
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* efx_fast_push_rx_descriptors - push new RX descriptors quickly
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* @rx_queue: RX descriptor queue
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*
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* This will aim to fill the RX descriptor queue up to
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* @rx_queue->@fast_fill_limit. If there is insufficient memory to do so,
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* it will schedule a work item to immediately continue the fast fill
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*/
|
|
void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue)
|
|
{
|
|
int rc;
|
|
|
|
rc = __efx_fast_push_rx_descriptors(rx_queue, 0);
|
|
if (unlikely(rc)) {
|
|
/* Schedule the work item to run immediately. The hope is
|
|
* that work is immediately pending to free some memory
|
|
* (e.g. an RX event or TX completion)
|
|
*/
|
|
efx_schedule_slow_fill(rx_queue, 0);
|
|
}
|
|
}
|
|
|
|
void efx_rx_work(struct work_struct *data)
|
|
{
|
|
struct efx_rx_queue *rx_queue;
|
|
int rc;
|
|
|
|
rx_queue = container_of(data, struct efx_rx_queue, work.work);
|
|
|
|
if (unlikely(!rx_queue->channel->enabled))
|
|
return;
|
|
|
|
EFX_TRACE(rx_queue->efx, "RX queue %d worker thread executing on CPU "
|
|
"%d\n", rx_queue->queue, raw_smp_processor_id());
|
|
|
|
++rx_queue->slow_fill_count;
|
|
/* Push new RX descriptors, allowing at least 1 jiffy for
|
|
* the kernel to free some more memory. */
|
|
rc = __efx_fast_push_rx_descriptors(rx_queue, 1);
|
|
if (rc)
|
|
efx_schedule_slow_fill(rx_queue, 1);
|
|
}
|
|
|
|
static void efx_rx_packet__check_len(struct efx_rx_queue *rx_queue,
|
|
struct efx_rx_buffer *rx_buf,
|
|
int len, bool *discard,
|
|
bool *leak_packet)
|
|
{
|
|
struct efx_nic *efx = rx_queue->efx;
|
|
unsigned max_len = rx_buf->len - efx->type->rx_buffer_padding;
|
|
|
|
if (likely(len <= max_len))
|
|
return;
|
|
|
|
/* The packet must be discarded, but this is only a fatal error
|
|
* if the caller indicated it was
|
|
*/
|
|
*discard = true;
|
|
|
|
if ((len > rx_buf->len) && EFX_WORKAROUND_8071(efx)) {
|
|
EFX_ERR_RL(efx, " RX queue %d seriously overlength "
|
|
"RX event (0x%x > 0x%x+0x%x). Leaking\n",
|
|
rx_queue->queue, len, max_len,
|
|
efx->type->rx_buffer_padding);
|
|
/* If this buffer was skb-allocated, then the meta
|
|
* data at the end of the skb will be trashed. So
|
|
* we have no choice but to leak the fragment.
|
|
*/
|
|
*leak_packet = (rx_buf->skb != NULL);
|
|
efx_schedule_reset(efx, RESET_TYPE_RX_RECOVERY);
|
|
} else {
|
|
EFX_ERR_RL(efx, " RX queue %d overlength RX event "
|
|
"(0x%x > 0x%x)\n", rx_queue->queue, len, max_len);
|
|
}
|
|
|
|
rx_queue->channel->n_rx_overlength++;
|
|
}
|
|
|
|
/* Pass a received packet up through the generic LRO stack
|
|
*
|
|
* Handles driverlink veto, and passes the fragment up via
|
|
* the appropriate LRO method
|
|
*/
|
|
static void efx_rx_packet_lro(struct efx_channel *channel,
|
|
struct efx_rx_buffer *rx_buf)
|
|
{
|
|
struct net_lro_mgr *lro_mgr = &channel->lro_mgr;
|
|
void *priv = channel;
|
|
|
|
/* Pass the skb/page into the LRO engine */
|
|
if (rx_buf->page) {
|
|
struct skb_frag_struct frags;
|
|
|
|
frags.page = rx_buf->page;
|
|
frags.page_offset = efx_rx_buf_offset(rx_buf);
|
|
frags.size = rx_buf->len;
|
|
|
|
lro_receive_frags(lro_mgr, &frags, rx_buf->len,
|
|
rx_buf->len, priv, 0);
|
|
|
|
EFX_BUG_ON_PARANOID(rx_buf->skb);
|
|
rx_buf->page = NULL;
|
|
} else {
|
|
EFX_BUG_ON_PARANOID(!rx_buf->skb);
|
|
|
|
lro_receive_skb(lro_mgr, rx_buf->skb, priv);
|
|
rx_buf->skb = NULL;
|
|
}
|
|
}
|
|
|
|
/* Allocate and construct an SKB around a struct page.*/
|
|
static struct sk_buff *efx_rx_mk_skb(struct efx_rx_buffer *rx_buf,
|
|
struct efx_nic *efx,
|
|
int hdr_len)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
/* Allocate an SKB to store the headers */
|
|
skb = netdev_alloc_skb(efx->net_dev, hdr_len + EFX_PAGE_SKB_ALIGN);
|
|
if (unlikely(skb == NULL)) {
|
|
EFX_ERR_RL(efx, "RX out of memory for skb\n");
|
|
return NULL;
|
|
}
|
|
|
|
EFX_BUG_ON_PARANOID(skb_shinfo(skb)->nr_frags);
|
|
EFX_BUG_ON_PARANOID(rx_buf->len < hdr_len);
|
|
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
skb_reserve(skb, EFX_PAGE_SKB_ALIGN);
|
|
|
|
skb->len = rx_buf->len;
|
|
skb->truesize = rx_buf->len + sizeof(struct sk_buff);
|
|
memcpy(skb->data, rx_buf->data, hdr_len);
|
|
skb->tail += hdr_len;
|
|
|
|
/* Append the remaining page onto the frag list */
|
|
if (unlikely(rx_buf->len > hdr_len)) {
|
|
struct skb_frag_struct *frag = skb_shinfo(skb)->frags;
|
|
frag->page = rx_buf->page;
|
|
frag->page_offset = efx_rx_buf_offset(rx_buf) + hdr_len;
|
|
frag->size = skb->len - hdr_len;
|
|
skb_shinfo(skb)->nr_frags = 1;
|
|
skb->data_len = frag->size;
|
|
} else {
|
|
__free_pages(rx_buf->page, efx->rx_buffer_order);
|
|
skb->data_len = 0;
|
|
}
|
|
|
|
/* Ownership has transferred from the rx_buf to skb */
|
|
rx_buf->page = NULL;
|
|
|
|
/* Move past the ethernet header */
|
|
skb->protocol = eth_type_trans(skb, efx->net_dev);
|
|
|
|
return skb;
|
|
}
|
|
|
|
void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
|
|
unsigned int len, bool checksummed, bool discard)
|
|
{
|
|
struct efx_nic *efx = rx_queue->efx;
|
|
struct efx_rx_buffer *rx_buf;
|
|
bool leak_packet = false;
|
|
|
|
rx_buf = efx_rx_buffer(rx_queue, index);
|
|
EFX_BUG_ON_PARANOID(!rx_buf->data);
|
|
EFX_BUG_ON_PARANOID(rx_buf->skb && rx_buf->page);
|
|
EFX_BUG_ON_PARANOID(!(rx_buf->skb || rx_buf->page));
|
|
|
|
/* This allows the refill path to post another buffer.
|
|
* EFX_RXD_HEAD_ROOM ensures that the slot we are using
|
|
* isn't overwritten yet.
|
|
*/
|
|
rx_queue->removed_count++;
|
|
|
|
/* Validate the length encoded in the event vs the descriptor pushed */
|
|
efx_rx_packet__check_len(rx_queue, rx_buf, len,
|
|
&discard, &leak_packet);
|
|
|
|
EFX_TRACE(efx, "RX queue %d received id %x at %llx+%x %s%s\n",
|
|
rx_queue->queue, index,
|
|
(unsigned long long)rx_buf->dma_addr, len,
|
|
(checksummed ? " [SUMMED]" : ""),
|
|
(discard ? " [DISCARD]" : ""));
|
|
|
|
/* Discard packet, if instructed to do so */
|
|
if (unlikely(discard)) {
|
|
if (unlikely(leak_packet))
|
|
rx_queue->channel->n_skbuff_leaks++;
|
|
else
|
|
/* We haven't called efx_unmap_rx_buffer yet,
|
|
* so fini the entire rx_buffer here */
|
|
efx_fini_rx_buffer(rx_queue, rx_buf);
|
|
return;
|
|
}
|
|
|
|
/* Release card resources - assumes all RX buffers consumed in-order
|
|
* per RX queue
|
|
*/
|
|
efx_unmap_rx_buffer(efx, rx_buf);
|
|
|
|
/* Prefetch nice and early so data will (hopefully) be in cache by
|
|
* the time we look at it.
|
|
*/
|
|
prefetch(rx_buf->data);
|
|
|
|
/* Pipeline receives so that we give time for packet headers to be
|
|
* prefetched into cache.
|
|
*/
|
|
rx_buf->len = len;
|
|
if (rx_queue->channel->rx_pkt)
|
|
__efx_rx_packet(rx_queue->channel,
|
|
rx_queue->channel->rx_pkt,
|
|
rx_queue->channel->rx_pkt_csummed);
|
|
rx_queue->channel->rx_pkt = rx_buf;
|
|
rx_queue->channel->rx_pkt_csummed = checksummed;
|
|
}
|
|
|
|
/* Handle a received packet. Second half: Touches packet payload. */
|
|
void __efx_rx_packet(struct efx_channel *channel,
|
|
struct efx_rx_buffer *rx_buf, bool checksummed)
|
|
{
|
|
struct efx_nic *efx = channel->efx;
|
|
struct sk_buff *skb;
|
|
bool lro = !!(efx->net_dev->features & NETIF_F_LRO);
|
|
|
|
/* If we're in loopback test, then pass the packet directly to the
|
|
* loopback layer, and free the rx_buf here
|
|
*/
|
|
if (unlikely(efx->loopback_selftest)) {
|
|
efx_loopback_rx_packet(efx, rx_buf->data, rx_buf->len);
|
|
efx_free_rx_buffer(efx, rx_buf);
|
|
goto done;
|
|
}
|
|
|
|
if (rx_buf->skb) {
|
|
prefetch(skb_shinfo(rx_buf->skb));
|
|
|
|
skb_put(rx_buf->skb, rx_buf->len);
|
|
|
|
/* Move past the ethernet header. rx_buf->data still points
|
|
* at the ethernet header */
|
|
rx_buf->skb->protocol = eth_type_trans(rx_buf->skb,
|
|
efx->net_dev);
|
|
}
|
|
|
|
/* Both our generic-LRO and SFC-SSR support skb and page based
|
|
* allocation, but neither support switching from one to the
|
|
* other on the fly. If we spot that the allocation mode has
|
|
* changed, then flush the LRO state.
|
|
*/
|
|
if (unlikely(channel->rx_alloc_pop_pages != (rx_buf->page != NULL))) {
|
|
efx_flush_lro(channel);
|
|
channel->rx_alloc_pop_pages = (rx_buf->page != NULL);
|
|
}
|
|
if (likely(checksummed && lro)) {
|
|
efx_rx_packet_lro(channel, rx_buf);
|
|
goto done;
|
|
}
|
|
|
|
/* Form an skb if required */
|
|
if (rx_buf->page) {
|
|
int hdr_len = min(rx_buf->len, EFX_SKB_HEADERS);
|
|
skb = efx_rx_mk_skb(rx_buf, efx, hdr_len);
|
|
if (unlikely(skb == NULL)) {
|
|
efx_free_rx_buffer(efx, rx_buf);
|
|
goto done;
|
|
}
|
|
} else {
|
|
/* We now own the SKB */
|
|
skb = rx_buf->skb;
|
|
rx_buf->skb = NULL;
|
|
}
|
|
|
|
EFX_BUG_ON_PARANOID(rx_buf->page);
|
|
EFX_BUG_ON_PARANOID(rx_buf->skb);
|
|
EFX_BUG_ON_PARANOID(!skb);
|
|
|
|
/* Set the SKB flags */
|
|
if (unlikely(!checksummed || !efx->rx_checksum_enabled))
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
|
|
/* Pass the packet up */
|
|
netif_receive_skb(skb);
|
|
|
|
/* Update allocation strategy method */
|
|
channel->rx_alloc_level += RX_ALLOC_FACTOR_SKB;
|
|
|
|
done:
|
|
efx->net_dev->last_rx = jiffies;
|
|
}
|
|
|
|
void efx_rx_strategy(struct efx_channel *channel)
|
|
{
|
|
enum efx_rx_alloc_method method = rx_alloc_method;
|
|
|
|
/* Only makes sense to use page based allocation if LRO is enabled */
|
|
if (!(channel->efx->net_dev->features & NETIF_F_LRO)) {
|
|
method = RX_ALLOC_METHOD_SKB;
|
|
} else if (method == RX_ALLOC_METHOD_AUTO) {
|
|
/* Constrain the rx_alloc_level */
|
|
if (channel->rx_alloc_level < 0)
|
|
channel->rx_alloc_level = 0;
|
|
else if (channel->rx_alloc_level > RX_ALLOC_LEVEL_MAX)
|
|
channel->rx_alloc_level = RX_ALLOC_LEVEL_MAX;
|
|
|
|
/* Decide on the allocation method */
|
|
method = ((channel->rx_alloc_level > RX_ALLOC_LEVEL_LRO) ?
|
|
RX_ALLOC_METHOD_PAGE : RX_ALLOC_METHOD_SKB);
|
|
}
|
|
|
|
/* Push the option */
|
|
channel->rx_alloc_push_pages = (method == RX_ALLOC_METHOD_PAGE);
|
|
}
|
|
|
|
int efx_probe_rx_queue(struct efx_rx_queue *rx_queue)
|
|
{
|
|
struct efx_nic *efx = rx_queue->efx;
|
|
unsigned int rxq_size;
|
|
int rc;
|
|
|
|
EFX_LOG(efx, "creating RX queue %d\n", rx_queue->queue);
|
|
|
|
/* Allocate RX buffers */
|
|
rxq_size = (efx->type->rxd_ring_mask + 1) * sizeof(*rx_queue->buffer);
|
|
rx_queue->buffer = kzalloc(rxq_size, GFP_KERNEL);
|
|
if (!rx_queue->buffer)
|
|
return -ENOMEM;
|
|
|
|
rc = falcon_probe_rx(rx_queue);
|
|
if (rc) {
|
|
kfree(rx_queue->buffer);
|
|
rx_queue->buffer = NULL;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
void efx_init_rx_queue(struct efx_rx_queue *rx_queue)
|
|
{
|
|
struct efx_nic *efx = rx_queue->efx;
|
|
unsigned int max_fill, trigger, limit;
|
|
|
|
EFX_LOG(rx_queue->efx, "initialising RX queue %d\n", rx_queue->queue);
|
|
|
|
/* Initialise ptr fields */
|
|
rx_queue->added_count = 0;
|
|
rx_queue->notified_count = 0;
|
|
rx_queue->removed_count = 0;
|
|
rx_queue->min_fill = -1U;
|
|
rx_queue->min_overfill = -1U;
|
|
|
|
/* Initialise limit fields */
|
|
max_fill = efx->type->rxd_ring_mask + 1 - EFX_RXD_HEAD_ROOM;
|
|
trigger = max_fill * min(rx_refill_threshold, 100U) / 100U;
|
|
limit = max_fill * min(rx_refill_limit, 100U) / 100U;
|
|
|
|
rx_queue->max_fill = max_fill;
|
|
rx_queue->fast_fill_trigger = trigger;
|
|
rx_queue->fast_fill_limit = limit;
|
|
|
|
/* Set up RX descriptor ring */
|
|
falcon_init_rx(rx_queue);
|
|
}
|
|
|
|
void efx_fini_rx_queue(struct efx_rx_queue *rx_queue)
|
|
{
|
|
int i;
|
|
struct efx_rx_buffer *rx_buf;
|
|
|
|
EFX_LOG(rx_queue->efx, "shutting down RX queue %d\n", rx_queue->queue);
|
|
|
|
falcon_fini_rx(rx_queue);
|
|
|
|
/* Release RX buffers NB start at index 0 not current HW ptr */
|
|
if (rx_queue->buffer) {
|
|
for (i = 0; i <= rx_queue->efx->type->rxd_ring_mask; i++) {
|
|
rx_buf = efx_rx_buffer(rx_queue, i);
|
|
efx_fini_rx_buffer(rx_queue, rx_buf);
|
|
}
|
|
}
|
|
|
|
/* For a page that is part-way through splitting into RX buffers */
|
|
if (rx_queue->buf_page != NULL) {
|
|
pci_unmap_page(rx_queue->efx->pci_dev, rx_queue->buf_dma_addr,
|
|
efx_rx_buf_size(rx_queue->efx),
|
|
PCI_DMA_FROMDEVICE);
|
|
__free_pages(rx_queue->buf_page,
|
|
rx_queue->efx->rx_buffer_order);
|
|
rx_queue->buf_page = NULL;
|
|
}
|
|
}
|
|
|
|
void efx_remove_rx_queue(struct efx_rx_queue *rx_queue)
|
|
{
|
|
EFX_LOG(rx_queue->efx, "destroying RX queue %d\n", rx_queue->queue);
|
|
|
|
falcon_remove_rx(rx_queue);
|
|
|
|
kfree(rx_queue->buffer);
|
|
rx_queue->buffer = NULL;
|
|
}
|
|
|
|
void efx_flush_lro(struct efx_channel *channel)
|
|
{
|
|
lro_flush_all(&channel->lro_mgr);
|
|
}
|
|
|
|
|
|
module_param(rx_alloc_method, int, 0644);
|
|
MODULE_PARM_DESC(rx_alloc_method, "Allocation method used for RX buffers");
|
|
|
|
module_param(rx_refill_threshold, uint, 0444);
|
|
MODULE_PARM_DESC(rx_refill_threshold,
|
|
"RX descriptor ring fast/slow fill threshold (%)");
|
|
|