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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 15:15:59 +07:00
5bd0767086
Current netback uses gso_type to check whether the skb contains gso offload, and this is wrong. Gso_size is the right one to check gso existence, and gso_type is only used to check gso type. Some skbs contains nonzero gso_type and zero gso_size, current netback would treat these skbs as gso and create wrong response for this. This also causes ssh failure to domu from other server. V2: use skb_is_gso function as Paul Durrant suggested Signed-off-by: Annie Li <annie.li@oracle.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Reviewed-by: Paul Durrant <paul.durrant@citrix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1605 lines
40 KiB
C
1605 lines
40 KiB
C
/*
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* Back-end of the driver for virtual network devices. This portion of the
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* driver exports a 'unified' network-device interface that can be accessed
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* by any operating system that implements a compatible front end. A
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* reference front-end implementation can be found in:
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* drivers/net/xen-netfront.c
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*
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* Copyright (c) 2002-2005, K A Fraser
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "common.h"
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#include <linux/kthread.h>
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#include <linux/if_vlan.h>
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#include <linux/udp.h>
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#include <net/tcp.h>
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#include <xen/xen.h>
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#include <xen/events.h>
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#include <xen/interface/memory.h>
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#include <asm/xen/hypercall.h>
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#include <asm/xen/page.h>
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/* Provide an option to disable split event channels at load time as
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* event channels are limited resource. Split event channels are
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* enabled by default.
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*/
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bool separate_tx_rx_irq = 1;
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module_param(separate_tx_rx_irq, bool, 0644);
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/*
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* This is the maximum slots a skb can have. If a guest sends a skb
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* which exceeds this limit it is considered malicious.
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*/
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#define FATAL_SKB_SLOTS_DEFAULT 20
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static unsigned int fatal_skb_slots = FATAL_SKB_SLOTS_DEFAULT;
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module_param(fatal_skb_slots, uint, 0444);
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/*
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* To avoid confusion, we define XEN_NETBK_LEGACY_SLOTS_MAX indicating
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* the maximum slots a valid packet can use. Now this value is defined
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* to be XEN_NETIF_NR_SLOTS_MIN, which is supposed to be supported by
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* all backend.
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*/
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#define XEN_NETBK_LEGACY_SLOTS_MAX XEN_NETIF_NR_SLOTS_MIN
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/*
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* If head != INVALID_PENDING_RING_IDX, it means this tx request is head of
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* one or more merged tx requests, otherwise it is the continuation of
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* previous tx request.
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*/
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static inline int pending_tx_is_head(struct xenvif *vif, RING_IDX idx)
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{
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return vif->pending_tx_info[idx].head != INVALID_PENDING_RING_IDX;
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}
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static void xenvif_idx_release(struct xenvif *vif, u16 pending_idx,
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u8 status);
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static void make_tx_response(struct xenvif *vif,
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struct xen_netif_tx_request *txp,
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s8 st);
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static inline int tx_work_todo(struct xenvif *vif);
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static inline int rx_work_todo(struct xenvif *vif);
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static struct xen_netif_rx_response *make_rx_response(struct xenvif *vif,
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u16 id,
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s8 st,
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u16 offset,
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u16 size,
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u16 flags);
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static inline unsigned long idx_to_pfn(struct xenvif *vif,
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u16 idx)
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{
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return page_to_pfn(vif->mmap_pages[idx]);
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}
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static inline unsigned long idx_to_kaddr(struct xenvif *vif,
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u16 idx)
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{
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return (unsigned long)pfn_to_kaddr(idx_to_pfn(vif, idx));
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}
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/* This is a miniumum size for the linear area to avoid lots of
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* calls to __pskb_pull_tail() as we set up checksum offsets. The
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* value 128 was chosen as it covers all IPv4 and most likely
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* IPv6 headers.
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*/
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#define PKT_PROT_LEN 128
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static u16 frag_get_pending_idx(skb_frag_t *frag)
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{
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return (u16)frag->page_offset;
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}
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static void frag_set_pending_idx(skb_frag_t *frag, u16 pending_idx)
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{
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frag->page_offset = pending_idx;
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}
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static inline pending_ring_idx_t pending_index(unsigned i)
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{
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return i & (MAX_PENDING_REQS-1);
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}
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static inline pending_ring_idx_t nr_pending_reqs(struct xenvif *vif)
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{
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return MAX_PENDING_REQS -
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vif->pending_prod + vif->pending_cons;
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}
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bool xenvif_rx_ring_slots_available(struct xenvif *vif, int needed)
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{
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RING_IDX prod, cons;
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do {
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prod = vif->rx.sring->req_prod;
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cons = vif->rx.req_cons;
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if (prod - cons >= needed)
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return true;
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vif->rx.sring->req_event = prod + 1;
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/* Make sure event is visible before we check prod
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* again.
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*/
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mb();
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} while (vif->rx.sring->req_prod != prod);
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return false;
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}
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/*
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* Returns true if we should start a new receive buffer instead of
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* adding 'size' bytes to a buffer which currently contains 'offset'
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* bytes.
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*/
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static bool start_new_rx_buffer(int offset, unsigned long size, int head)
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{
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/* simple case: we have completely filled the current buffer. */
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if (offset == MAX_BUFFER_OFFSET)
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return true;
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/*
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* complex case: start a fresh buffer if the current frag
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* would overflow the current buffer but only if:
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* (i) this frag would fit completely in the next buffer
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* and (ii) there is already some data in the current buffer
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* and (iii) this is not the head buffer.
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*
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* Where:
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* - (i) stops us splitting a frag into two copies
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* unless the frag is too large for a single buffer.
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* - (ii) stops us from leaving a buffer pointlessly empty.
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* - (iii) stops us leaving the first buffer
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* empty. Strictly speaking this is already covered
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* by (ii) but is explicitly checked because
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* netfront relies on the first buffer being
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* non-empty and can crash otherwise.
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*
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* This means we will effectively linearise small
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* frags but do not needlessly split large buffers
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* into multiple copies tend to give large frags their
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* own buffers as before.
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*/
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if ((offset + size > MAX_BUFFER_OFFSET) &&
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(size <= MAX_BUFFER_OFFSET) && offset && !head)
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return true;
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return false;
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}
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struct netrx_pending_operations {
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unsigned copy_prod, copy_cons;
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unsigned meta_prod, meta_cons;
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struct gnttab_copy *copy;
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struct xenvif_rx_meta *meta;
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int copy_off;
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grant_ref_t copy_gref;
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};
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static struct xenvif_rx_meta *get_next_rx_buffer(struct xenvif *vif,
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struct netrx_pending_operations *npo)
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{
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struct xenvif_rx_meta *meta;
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struct xen_netif_rx_request *req;
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req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++);
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meta = npo->meta + npo->meta_prod++;
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meta->gso_type = XEN_NETIF_GSO_TYPE_NONE;
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meta->gso_size = 0;
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meta->size = 0;
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meta->id = req->id;
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npo->copy_off = 0;
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npo->copy_gref = req->gref;
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return meta;
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}
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/*
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* Set up the grant operations for this fragment. If it's a flipping
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* interface, we also set up the unmap request from here.
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*/
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static void xenvif_gop_frag_copy(struct xenvif *vif, struct sk_buff *skb,
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struct netrx_pending_operations *npo,
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struct page *page, unsigned long size,
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unsigned long offset, int *head)
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{
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struct gnttab_copy *copy_gop;
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struct xenvif_rx_meta *meta;
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unsigned long bytes;
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int gso_type = XEN_NETIF_GSO_TYPE_NONE;
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/* Data must not cross a page boundary. */
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BUG_ON(size + offset > PAGE_SIZE<<compound_order(page));
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meta = npo->meta + npo->meta_prod - 1;
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/* Skip unused frames from start of page */
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page += offset >> PAGE_SHIFT;
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offset &= ~PAGE_MASK;
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while (size > 0) {
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BUG_ON(offset >= PAGE_SIZE);
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BUG_ON(npo->copy_off > MAX_BUFFER_OFFSET);
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bytes = PAGE_SIZE - offset;
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if (bytes > size)
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bytes = size;
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if (start_new_rx_buffer(npo->copy_off, bytes, *head)) {
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/*
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* Netfront requires there to be some data in the head
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* buffer.
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*/
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BUG_ON(*head);
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meta = get_next_rx_buffer(vif, npo);
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}
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if (npo->copy_off + bytes > MAX_BUFFER_OFFSET)
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bytes = MAX_BUFFER_OFFSET - npo->copy_off;
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copy_gop = npo->copy + npo->copy_prod++;
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copy_gop->flags = GNTCOPY_dest_gref;
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copy_gop->len = bytes;
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copy_gop->source.domid = DOMID_SELF;
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copy_gop->source.u.gmfn = virt_to_mfn(page_address(page));
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copy_gop->source.offset = offset;
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copy_gop->dest.domid = vif->domid;
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copy_gop->dest.offset = npo->copy_off;
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copy_gop->dest.u.ref = npo->copy_gref;
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npo->copy_off += bytes;
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meta->size += bytes;
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offset += bytes;
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size -= bytes;
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/* Next frame */
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if (offset == PAGE_SIZE && size) {
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BUG_ON(!PageCompound(page));
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page++;
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offset = 0;
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}
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/* Leave a gap for the GSO descriptor. */
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if (skb_is_gso(skb)) {
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if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
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gso_type = XEN_NETIF_GSO_TYPE_TCPV4;
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else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
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gso_type = XEN_NETIF_GSO_TYPE_TCPV6;
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}
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if (*head && ((1 << gso_type) & vif->gso_mask))
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vif->rx.req_cons++;
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*head = 0; /* There must be something in this buffer now. */
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}
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}
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/*
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* Prepare an SKB to be transmitted to the frontend.
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*
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* This function is responsible for allocating grant operations, meta
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* structures, etc.
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*
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* It returns the number of meta structures consumed. The number of
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* ring slots used is always equal to the number of meta slots used
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* plus the number of GSO descriptors used. Currently, we use either
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* zero GSO descriptors (for non-GSO packets) or one descriptor (for
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* frontend-side LRO).
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*/
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static int xenvif_gop_skb(struct sk_buff *skb,
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struct netrx_pending_operations *npo)
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{
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struct xenvif *vif = netdev_priv(skb->dev);
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int nr_frags = skb_shinfo(skb)->nr_frags;
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int i;
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struct xen_netif_rx_request *req;
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struct xenvif_rx_meta *meta;
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unsigned char *data;
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int head = 1;
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int old_meta_prod;
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int gso_type;
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old_meta_prod = npo->meta_prod;
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gso_type = XEN_NETIF_GSO_TYPE_NONE;
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if (skb_is_gso(skb)) {
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if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
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gso_type = XEN_NETIF_GSO_TYPE_TCPV4;
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else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
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gso_type = XEN_NETIF_GSO_TYPE_TCPV6;
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}
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/* Set up a GSO prefix descriptor, if necessary */
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if ((1 << gso_type) & vif->gso_prefix_mask) {
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req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++);
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meta = npo->meta + npo->meta_prod++;
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meta->gso_type = gso_type;
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meta->gso_size = skb_shinfo(skb)->gso_size;
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meta->size = 0;
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meta->id = req->id;
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}
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req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++);
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meta = npo->meta + npo->meta_prod++;
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if ((1 << gso_type) & vif->gso_mask) {
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meta->gso_type = gso_type;
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meta->gso_size = skb_shinfo(skb)->gso_size;
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} else {
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meta->gso_type = XEN_NETIF_GSO_TYPE_NONE;
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meta->gso_size = 0;
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}
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meta->size = 0;
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meta->id = req->id;
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npo->copy_off = 0;
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npo->copy_gref = req->gref;
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data = skb->data;
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while (data < skb_tail_pointer(skb)) {
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unsigned int offset = offset_in_page(data);
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unsigned int len = PAGE_SIZE - offset;
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if (data + len > skb_tail_pointer(skb))
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len = skb_tail_pointer(skb) - data;
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xenvif_gop_frag_copy(vif, skb, npo,
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virt_to_page(data), len, offset, &head);
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data += len;
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}
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for (i = 0; i < nr_frags; i++) {
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xenvif_gop_frag_copy(vif, skb, npo,
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skb_frag_page(&skb_shinfo(skb)->frags[i]),
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skb_frag_size(&skb_shinfo(skb)->frags[i]),
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skb_shinfo(skb)->frags[i].page_offset,
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&head);
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}
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return npo->meta_prod - old_meta_prod;
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}
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/*
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* This is a twin to xenvif_gop_skb. Assume that xenvif_gop_skb was
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* used to set up the operations on the top of
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* netrx_pending_operations, which have since been done. Check that
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* they didn't give any errors and advance over them.
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*/
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static int xenvif_check_gop(struct xenvif *vif, int nr_meta_slots,
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struct netrx_pending_operations *npo)
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{
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struct gnttab_copy *copy_op;
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int status = XEN_NETIF_RSP_OKAY;
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int i;
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for (i = 0; i < nr_meta_slots; i++) {
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copy_op = npo->copy + npo->copy_cons++;
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if (copy_op->status != GNTST_okay) {
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netdev_dbg(vif->dev,
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"Bad status %d from copy to DOM%d.\n",
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copy_op->status, vif->domid);
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status = XEN_NETIF_RSP_ERROR;
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}
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}
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return status;
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}
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|
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static void xenvif_add_frag_responses(struct xenvif *vif, int status,
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struct xenvif_rx_meta *meta,
|
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int nr_meta_slots)
|
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{
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int i;
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unsigned long offset;
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|
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/* No fragments used */
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if (nr_meta_slots <= 1)
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return;
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nr_meta_slots--;
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for (i = 0; i < nr_meta_slots; i++) {
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int flags;
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if (i == nr_meta_slots - 1)
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flags = 0;
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else
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flags = XEN_NETRXF_more_data;
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|
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offset = 0;
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make_rx_response(vif, meta[i].id, status, offset,
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meta[i].size, flags);
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}
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}
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|
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struct skb_cb_overlay {
|
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int meta_slots_used;
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};
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|
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void xenvif_kick_thread(struct xenvif *vif)
|
|
{
|
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wake_up(&vif->wq);
|
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}
|
|
|
|
static void xenvif_rx_action(struct xenvif *vif)
|
|
{
|
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s8 status;
|
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u16 flags;
|
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struct xen_netif_rx_response *resp;
|
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struct sk_buff_head rxq;
|
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struct sk_buff *skb;
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LIST_HEAD(notify);
|
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int ret;
|
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unsigned long offset;
|
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struct skb_cb_overlay *sco;
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bool need_to_notify = false;
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|
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struct netrx_pending_operations npo = {
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.copy = vif->grant_copy_op,
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.meta = vif->meta,
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};
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|
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skb_queue_head_init(&rxq);
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|
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while ((skb = skb_dequeue(&vif->rx_queue)) != NULL) {
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RING_IDX max_slots_needed;
|
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int i;
|
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|
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/* We need a cheap worse case estimate for the number of
|
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* slots we'll use.
|
|
*/
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|
|
max_slots_needed = DIV_ROUND_UP(offset_in_page(skb->data) +
|
|
skb_headlen(skb),
|
|
PAGE_SIZE);
|
|
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
|
|
unsigned int size;
|
|
size = skb_frag_size(&skb_shinfo(skb)->frags[i]);
|
|
max_slots_needed += DIV_ROUND_UP(size, PAGE_SIZE);
|
|
}
|
|
if (skb_is_gso(skb) &&
|
|
(skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4 ||
|
|
skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6))
|
|
max_slots_needed++;
|
|
|
|
/* If the skb may not fit then bail out now */
|
|
if (!xenvif_rx_ring_slots_available(vif, max_slots_needed)) {
|
|
skb_queue_head(&vif->rx_queue, skb);
|
|
need_to_notify = true;
|
|
vif->rx_last_skb_slots = max_slots_needed;
|
|
break;
|
|
} else
|
|
vif->rx_last_skb_slots = 0;
|
|
|
|
sco = (struct skb_cb_overlay *)skb->cb;
|
|
sco->meta_slots_used = xenvif_gop_skb(skb, &npo);
|
|
BUG_ON(sco->meta_slots_used > max_slots_needed);
|
|
|
|
__skb_queue_tail(&rxq, skb);
|
|
}
|
|
|
|
BUG_ON(npo.meta_prod > ARRAY_SIZE(vif->meta));
|
|
|
|
if (!npo.copy_prod)
|
|
goto done;
|
|
|
|
BUG_ON(npo.copy_prod > MAX_GRANT_COPY_OPS);
|
|
gnttab_batch_copy(vif->grant_copy_op, npo.copy_prod);
|
|
|
|
while ((skb = __skb_dequeue(&rxq)) != NULL) {
|
|
sco = (struct skb_cb_overlay *)skb->cb;
|
|
|
|
if ((1 << vif->meta[npo.meta_cons].gso_type) &
|
|
vif->gso_prefix_mask) {
|
|
resp = RING_GET_RESPONSE(&vif->rx,
|
|
vif->rx.rsp_prod_pvt++);
|
|
|
|
resp->flags = XEN_NETRXF_gso_prefix | XEN_NETRXF_more_data;
|
|
|
|
resp->offset = vif->meta[npo.meta_cons].gso_size;
|
|
resp->id = vif->meta[npo.meta_cons].id;
|
|
resp->status = sco->meta_slots_used;
|
|
|
|
npo.meta_cons++;
|
|
sco->meta_slots_used--;
|
|
}
|
|
|
|
|
|
vif->dev->stats.tx_bytes += skb->len;
|
|
vif->dev->stats.tx_packets++;
|
|
|
|
status = xenvif_check_gop(vif, sco->meta_slots_used, &npo);
|
|
|
|
if (sco->meta_slots_used == 1)
|
|
flags = 0;
|
|
else
|
|
flags = XEN_NETRXF_more_data;
|
|
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL) /* local packet? */
|
|
flags |= XEN_NETRXF_csum_blank | XEN_NETRXF_data_validated;
|
|
else if (skb->ip_summed == CHECKSUM_UNNECESSARY)
|
|
/* remote but checksummed. */
|
|
flags |= XEN_NETRXF_data_validated;
|
|
|
|
offset = 0;
|
|
resp = make_rx_response(vif, vif->meta[npo.meta_cons].id,
|
|
status, offset,
|
|
vif->meta[npo.meta_cons].size,
|
|
flags);
|
|
|
|
if ((1 << vif->meta[npo.meta_cons].gso_type) &
|
|
vif->gso_mask) {
|
|
struct xen_netif_extra_info *gso =
|
|
(struct xen_netif_extra_info *)
|
|
RING_GET_RESPONSE(&vif->rx,
|
|
vif->rx.rsp_prod_pvt++);
|
|
|
|
resp->flags |= XEN_NETRXF_extra_info;
|
|
|
|
gso->u.gso.type = vif->meta[npo.meta_cons].gso_type;
|
|
gso->u.gso.size = vif->meta[npo.meta_cons].gso_size;
|
|
gso->u.gso.pad = 0;
|
|
gso->u.gso.features = 0;
|
|
|
|
gso->type = XEN_NETIF_EXTRA_TYPE_GSO;
|
|
gso->flags = 0;
|
|
}
|
|
|
|
xenvif_add_frag_responses(vif, status,
|
|
vif->meta + npo.meta_cons + 1,
|
|
sco->meta_slots_used);
|
|
|
|
RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&vif->rx, ret);
|
|
|
|
need_to_notify |= !!ret;
|
|
|
|
npo.meta_cons += sco->meta_slots_used;
|
|
dev_kfree_skb(skb);
|
|
}
|
|
|
|
done:
|
|
if (need_to_notify)
|
|
notify_remote_via_irq(vif->rx_irq);
|
|
}
|
|
|
|
void xenvif_check_rx_xenvif(struct xenvif *vif)
|
|
{
|
|
int more_to_do;
|
|
|
|
RING_FINAL_CHECK_FOR_REQUESTS(&vif->tx, more_to_do);
|
|
|
|
if (more_to_do)
|
|
napi_schedule(&vif->napi);
|
|
}
|
|
|
|
static void tx_add_credit(struct xenvif *vif)
|
|
{
|
|
unsigned long max_burst, max_credit;
|
|
|
|
/*
|
|
* Allow a burst big enough to transmit a jumbo packet of up to 128kB.
|
|
* Otherwise the interface can seize up due to insufficient credit.
|
|
*/
|
|
max_burst = RING_GET_REQUEST(&vif->tx, vif->tx.req_cons)->size;
|
|
max_burst = min(max_burst, 131072UL);
|
|
max_burst = max(max_burst, vif->credit_bytes);
|
|
|
|
/* Take care that adding a new chunk of credit doesn't wrap to zero. */
|
|
max_credit = vif->remaining_credit + vif->credit_bytes;
|
|
if (max_credit < vif->remaining_credit)
|
|
max_credit = ULONG_MAX; /* wrapped: clamp to ULONG_MAX */
|
|
|
|
vif->remaining_credit = min(max_credit, max_burst);
|
|
}
|
|
|
|
static void tx_credit_callback(unsigned long data)
|
|
{
|
|
struct xenvif *vif = (struct xenvif *)data;
|
|
tx_add_credit(vif);
|
|
xenvif_check_rx_xenvif(vif);
|
|
}
|
|
|
|
static void xenvif_tx_err(struct xenvif *vif,
|
|
struct xen_netif_tx_request *txp, RING_IDX end)
|
|
{
|
|
RING_IDX cons = vif->tx.req_cons;
|
|
|
|
do {
|
|
make_tx_response(vif, txp, XEN_NETIF_RSP_ERROR);
|
|
if (cons == end)
|
|
break;
|
|
txp = RING_GET_REQUEST(&vif->tx, cons++);
|
|
} while (1);
|
|
vif->tx.req_cons = cons;
|
|
}
|
|
|
|
static void xenvif_fatal_tx_err(struct xenvif *vif)
|
|
{
|
|
netdev_err(vif->dev, "fatal error; disabling device\n");
|
|
xenvif_carrier_off(vif);
|
|
}
|
|
|
|
static int xenvif_count_requests(struct xenvif *vif,
|
|
struct xen_netif_tx_request *first,
|
|
struct xen_netif_tx_request *txp,
|
|
int work_to_do)
|
|
{
|
|
RING_IDX cons = vif->tx.req_cons;
|
|
int slots = 0;
|
|
int drop_err = 0;
|
|
int more_data;
|
|
|
|
if (!(first->flags & XEN_NETTXF_more_data))
|
|
return 0;
|
|
|
|
do {
|
|
struct xen_netif_tx_request dropped_tx = { 0 };
|
|
|
|
if (slots >= work_to_do) {
|
|
netdev_err(vif->dev,
|
|
"Asked for %d slots but exceeds this limit\n",
|
|
work_to_do);
|
|
xenvif_fatal_tx_err(vif);
|
|
return -ENODATA;
|
|
}
|
|
|
|
/* This guest is really using too many slots and
|
|
* considered malicious.
|
|
*/
|
|
if (unlikely(slots >= fatal_skb_slots)) {
|
|
netdev_err(vif->dev,
|
|
"Malicious frontend using %d slots, threshold %u\n",
|
|
slots, fatal_skb_slots);
|
|
xenvif_fatal_tx_err(vif);
|
|
return -E2BIG;
|
|
}
|
|
|
|
/* Xen network protocol had implicit dependency on
|
|
* MAX_SKB_FRAGS. XEN_NETBK_LEGACY_SLOTS_MAX is set to
|
|
* the historical MAX_SKB_FRAGS value 18 to honor the
|
|
* same behavior as before. Any packet using more than
|
|
* 18 slots but less than fatal_skb_slots slots is
|
|
* dropped
|
|
*/
|
|
if (!drop_err && slots >= XEN_NETBK_LEGACY_SLOTS_MAX) {
|
|
if (net_ratelimit())
|
|
netdev_dbg(vif->dev,
|
|
"Too many slots (%d) exceeding limit (%d), dropping packet\n",
|
|
slots, XEN_NETBK_LEGACY_SLOTS_MAX);
|
|
drop_err = -E2BIG;
|
|
}
|
|
|
|
if (drop_err)
|
|
txp = &dropped_tx;
|
|
|
|
memcpy(txp, RING_GET_REQUEST(&vif->tx, cons + slots),
|
|
sizeof(*txp));
|
|
|
|
/* If the guest submitted a frame >= 64 KiB then
|
|
* first->size overflowed and following slots will
|
|
* appear to be larger than the frame.
|
|
*
|
|
* This cannot be fatal error as there are buggy
|
|
* frontends that do this.
|
|
*
|
|
* Consume all slots and drop the packet.
|
|
*/
|
|
if (!drop_err && txp->size > first->size) {
|
|
if (net_ratelimit())
|
|
netdev_dbg(vif->dev,
|
|
"Invalid tx request, slot size %u > remaining size %u\n",
|
|
txp->size, first->size);
|
|
drop_err = -EIO;
|
|
}
|
|
|
|
first->size -= txp->size;
|
|
slots++;
|
|
|
|
if (unlikely((txp->offset + txp->size) > PAGE_SIZE)) {
|
|
netdev_err(vif->dev, "Cross page boundary, txp->offset: %x, size: %u\n",
|
|
txp->offset, txp->size);
|
|
xenvif_fatal_tx_err(vif);
|
|
return -EINVAL;
|
|
}
|
|
|
|
more_data = txp->flags & XEN_NETTXF_more_data;
|
|
|
|
if (!drop_err)
|
|
txp++;
|
|
|
|
} while (more_data);
|
|
|
|
if (drop_err) {
|
|
xenvif_tx_err(vif, first, cons + slots);
|
|
return drop_err;
|
|
}
|
|
|
|
return slots;
|
|
}
|
|
|
|
static struct page *xenvif_alloc_page(struct xenvif *vif,
|
|
u16 pending_idx)
|
|
{
|
|
struct page *page;
|
|
|
|
page = alloc_page(GFP_ATOMIC|__GFP_COLD);
|
|
if (!page)
|
|
return NULL;
|
|
vif->mmap_pages[pending_idx] = page;
|
|
|
|
return page;
|
|
}
|
|
|
|
static struct gnttab_copy *xenvif_get_requests(struct xenvif *vif,
|
|
struct sk_buff *skb,
|
|
struct xen_netif_tx_request *txp,
|
|
struct gnttab_copy *gop)
|
|
{
|
|
struct skb_shared_info *shinfo = skb_shinfo(skb);
|
|
skb_frag_t *frags = shinfo->frags;
|
|
u16 pending_idx = *((u16 *)skb->data);
|
|
u16 head_idx = 0;
|
|
int slot, start;
|
|
struct page *page;
|
|
pending_ring_idx_t index, start_idx = 0;
|
|
uint16_t dst_offset;
|
|
unsigned int nr_slots;
|
|
struct pending_tx_info *first = NULL;
|
|
|
|
/* At this point shinfo->nr_frags is in fact the number of
|
|
* slots, which can be as large as XEN_NETBK_LEGACY_SLOTS_MAX.
|
|
*/
|
|
nr_slots = shinfo->nr_frags;
|
|
|
|
/* Skip first skb fragment if it is on same page as header fragment. */
|
|
start = (frag_get_pending_idx(&shinfo->frags[0]) == pending_idx);
|
|
|
|
/* Coalesce tx requests, at this point the packet passed in
|
|
* should be <= 64K. Any packets larger than 64K have been
|
|
* handled in xenvif_count_requests().
|
|
*/
|
|
for (shinfo->nr_frags = slot = start; slot < nr_slots;
|
|
shinfo->nr_frags++) {
|
|
struct pending_tx_info *pending_tx_info =
|
|
vif->pending_tx_info;
|
|
|
|
page = alloc_page(GFP_ATOMIC|__GFP_COLD);
|
|
if (!page)
|
|
goto err;
|
|
|
|
dst_offset = 0;
|
|
first = NULL;
|
|
while (dst_offset < PAGE_SIZE && slot < nr_slots) {
|
|
gop->flags = GNTCOPY_source_gref;
|
|
|
|
gop->source.u.ref = txp->gref;
|
|
gop->source.domid = vif->domid;
|
|
gop->source.offset = txp->offset;
|
|
|
|
gop->dest.domid = DOMID_SELF;
|
|
|
|
gop->dest.offset = dst_offset;
|
|
gop->dest.u.gmfn = virt_to_mfn(page_address(page));
|
|
|
|
if (dst_offset + txp->size > PAGE_SIZE) {
|
|
/* This page can only merge a portion
|
|
* of tx request. Do not increment any
|
|
* pointer / counter here. The txp
|
|
* will be dealt with in future
|
|
* rounds, eventually hitting the
|
|
* `else` branch.
|
|
*/
|
|
gop->len = PAGE_SIZE - dst_offset;
|
|
txp->offset += gop->len;
|
|
txp->size -= gop->len;
|
|
dst_offset += gop->len; /* quit loop */
|
|
} else {
|
|
/* This tx request can be merged in the page */
|
|
gop->len = txp->size;
|
|
dst_offset += gop->len;
|
|
|
|
index = pending_index(vif->pending_cons++);
|
|
|
|
pending_idx = vif->pending_ring[index];
|
|
|
|
memcpy(&pending_tx_info[pending_idx].req, txp,
|
|
sizeof(*txp));
|
|
|
|
/* Poison these fields, corresponding
|
|
* fields for head tx req will be set
|
|
* to correct values after the loop.
|
|
*/
|
|
vif->mmap_pages[pending_idx] = (void *)(~0UL);
|
|
pending_tx_info[pending_idx].head =
|
|
INVALID_PENDING_RING_IDX;
|
|
|
|
if (!first) {
|
|
first = &pending_tx_info[pending_idx];
|
|
start_idx = index;
|
|
head_idx = pending_idx;
|
|
}
|
|
|
|
txp++;
|
|
slot++;
|
|
}
|
|
|
|
gop++;
|
|
}
|
|
|
|
first->req.offset = 0;
|
|
first->req.size = dst_offset;
|
|
first->head = start_idx;
|
|
vif->mmap_pages[head_idx] = page;
|
|
frag_set_pending_idx(&frags[shinfo->nr_frags], head_idx);
|
|
}
|
|
|
|
BUG_ON(shinfo->nr_frags > MAX_SKB_FRAGS);
|
|
|
|
return gop;
|
|
err:
|
|
/* Unwind, freeing all pages and sending error responses. */
|
|
while (shinfo->nr_frags-- > start) {
|
|
xenvif_idx_release(vif,
|
|
frag_get_pending_idx(&frags[shinfo->nr_frags]),
|
|
XEN_NETIF_RSP_ERROR);
|
|
}
|
|
/* The head too, if necessary. */
|
|
if (start)
|
|
xenvif_idx_release(vif, pending_idx, XEN_NETIF_RSP_ERROR);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int xenvif_tx_check_gop(struct xenvif *vif,
|
|
struct sk_buff *skb,
|
|
struct gnttab_copy **gopp)
|
|
{
|
|
struct gnttab_copy *gop = *gopp;
|
|
u16 pending_idx = *((u16 *)skb->data);
|
|
struct skb_shared_info *shinfo = skb_shinfo(skb);
|
|
struct pending_tx_info *tx_info;
|
|
int nr_frags = shinfo->nr_frags;
|
|
int i, err, start;
|
|
u16 peek; /* peek into next tx request */
|
|
|
|
/* Check status of header. */
|
|
err = gop->status;
|
|
if (unlikely(err))
|
|
xenvif_idx_release(vif, pending_idx, XEN_NETIF_RSP_ERROR);
|
|
|
|
/* Skip first skb fragment if it is on same page as header fragment. */
|
|
start = (frag_get_pending_idx(&shinfo->frags[0]) == pending_idx);
|
|
|
|
for (i = start; i < nr_frags; i++) {
|
|
int j, newerr;
|
|
pending_ring_idx_t head;
|
|
|
|
pending_idx = frag_get_pending_idx(&shinfo->frags[i]);
|
|
tx_info = &vif->pending_tx_info[pending_idx];
|
|
head = tx_info->head;
|
|
|
|
/* Check error status: if okay then remember grant handle. */
|
|
do {
|
|
newerr = (++gop)->status;
|
|
if (newerr)
|
|
break;
|
|
peek = vif->pending_ring[pending_index(++head)];
|
|
} while (!pending_tx_is_head(vif, peek));
|
|
|
|
if (likely(!newerr)) {
|
|
/* Had a previous error? Invalidate this fragment. */
|
|
if (unlikely(err))
|
|
xenvif_idx_release(vif, pending_idx,
|
|
XEN_NETIF_RSP_OKAY);
|
|
continue;
|
|
}
|
|
|
|
/* Error on this fragment: respond to client with an error. */
|
|
xenvif_idx_release(vif, pending_idx, XEN_NETIF_RSP_ERROR);
|
|
|
|
/* Not the first error? Preceding frags already invalidated. */
|
|
if (err)
|
|
continue;
|
|
|
|
/* First error: invalidate header and preceding fragments. */
|
|
pending_idx = *((u16 *)skb->data);
|
|
xenvif_idx_release(vif, pending_idx, XEN_NETIF_RSP_OKAY);
|
|
for (j = start; j < i; j++) {
|
|
pending_idx = frag_get_pending_idx(&shinfo->frags[j]);
|
|
xenvif_idx_release(vif, pending_idx,
|
|
XEN_NETIF_RSP_OKAY);
|
|
}
|
|
|
|
/* Remember the error: invalidate all subsequent fragments. */
|
|
err = newerr;
|
|
}
|
|
|
|
*gopp = gop + 1;
|
|
return err;
|
|
}
|
|
|
|
static void xenvif_fill_frags(struct xenvif *vif, struct sk_buff *skb)
|
|
{
|
|
struct skb_shared_info *shinfo = skb_shinfo(skb);
|
|
int nr_frags = shinfo->nr_frags;
|
|
int i;
|
|
|
|
for (i = 0; i < nr_frags; i++) {
|
|
skb_frag_t *frag = shinfo->frags + i;
|
|
struct xen_netif_tx_request *txp;
|
|
struct page *page;
|
|
u16 pending_idx;
|
|
|
|
pending_idx = frag_get_pending_idx(frag);
|
|
|
|
txp = &vif->pending_tx_info[pending_idx].req;
|
|
page = virt_to_page(idx_to_kaddr(vif, pending_idx));
|
|
__skb_fill_page_desc(skb, i, page, txp->offset, txp->size);
|
|
skb->len += txp->size;
|
|
skb->data_len += txp->size;
|
|
skb->truesize += txp->size;
|
|
|
|
/* Take an extra reference to offset xenvif_idx_release */
|
|
get_page(vif->mmap_pages[pending_idx]);
|
|
xenvif_idx_release(vif, pending_idx, XEN_NETIF_RSP_OKAY);
|
|
}
|
|
}
|
|
|
|
static int xenvif_get_extras(struct xenvif *vif,
|
|
struct xen_netif_extra_info *extras,
|
|
int work_to_do)
|
|
{
|
|
struct xen_netif_extra_info extra;
|
|
RING_IDX cons = vif->tx.req_cons;
|
|
|
|
do {
|
|
if (unlikely(work_to_do-- <= 0)) {
|
|
netdev_err(vif->dev, "Missing extra info\n");
|
|
xenvif_fatal_tx_err(vif);
|
|
return -EBADR;
|
|
}
|
|
|
|
memcpy(&extra, RING_GET_REQUEST(&vif->tx, cons),
|
|
sizeof(extra));
|
|
if (unlikely(!extra.type ||
|
|
extra.type >= XEN_NETIF_EXTRA_TYPE_MAX)) {
|
|
vif->tx.req_cons = ++cons;
|
|
netdev_err(vif->dev,
|
|
"Invalid extra type: %d\n", extra.type);
|
|
xenvif_fatal_tx_err(vif);
|
|
return -EINVAL;
|
|
}
|
|
|
|
memcpy(&extras[extra.type - 1], &extra, sizeof(extra));
|
|
vif->tx.req_cons = ++cons;
|
|
} while (extra.flags & XEN_NETIF_EXTRA_FLAG_MORE);
|
|
|
|
return work_to_do;
|
|
}
|
|
|
|
static int xenvif_set_skb_gso(struct xenvif *vif,
|
|
struct sk_buff *skb,
|
|
struct xen_netif_extra_info *gso)
|
|
{
|
|
if (!gso->u.gso.size) {
|
|
netdev_err(vif->dev, "GSO size must not be zero.\n");
|
|
xenvif_fatal_tx_err(vif);
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (gso->u.gso.type) {
|
|
case XEN_NETIF_GSO_TYPE_TCPV4:
|
|
skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
|
|
break;
|
|
case XEN_NETIF_GSO_TYPE_TCPV6:
|
|
skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
|
|
break;
|
|
default:
|
|
netdev_err(vif->dev, "Bad GSO type %d.\n", gso->u.gso.type);
|
|
xenvif_fatal_tx_err(vif);
|
|
return -EINVAL;
|
|
}
|
|
|
|
skb_shinfo(skb)->gso_size = gso->u.gso.size;
|
|
/* gso_segs will be calculated later */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int checksum_setup(struct xenvif *vif, struct sk_buff *skb)
|
|
{
|
|
bool recalculate_partial_csum = false;
|
|
|
|
/* A GSO SKB must be CHECKSUM_PARTIAL. However some buggy
|
|
* peers can fail to set NETRXF_csum_blank when sending a GSO
|
|
* frame. In this case force the SKB to CHECKSUM_PARTIAL and
|
|
* recalculate the partial checksum.
|
|
*/
|
|
if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) {
|
|
vif->rx_gso_checksum_fixup++;
|
|
skb->ip_summed = CHECKSUM_PARTIAL;
|
|
recalculate_partial_csum = true;
|
|
}
|
|
|
|
/* A non-CHECKSUM_PARTIAL SKB does not require setup. */
|
|
if (skb->ip_summed != CHECKSUM_PARTIAL)
|
|
return 0;
|
|
|
|
return skb_checksum_setup(skb, recalculate_partial_csum);
|
|
}
|
|
|
|
static bool tx_credit_exceeded(struct xenvif *vif, unsigned size)
|
|
{
|
|
u64 now = get_jiffies_64();
|
|
u64 next_credit = vif->credit_window_start +
|
|
msecs_to_jiffies(vif->credit_usec / 1000);
|
|
|
|
/* Timer could already be pending in rare cases. */
|
|
if (timer_pending(&vif->credit_timeout))
|
|
return true;
|
|
|
|
/* Passed the point where we can replenish credit? */
|
|
if (time_after_eq64(now, next_credit)) {
|
|
vif->credit_window_start = now;
|
|
tx_add_credit(vif);
|
|
}
|
|
|
|
/* Still too big to send right now? Set a callback. */
|
|
if (size > vif->remaining_credit) {
|
|
vif->credit_timeout.data =
|
|
(unsigned long)vif;
|
|
vif->credit_timeout.function =
|
|
tx_credit_callback;
|
|
mod_timer(&vif->credit_timeout,
|
|
next_credit);
|
|
vif->credit_window_start = next_credit;
|
|
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static unsigned xenvif_tx_build_gops(struct xenvif *vif, int budget)
|
|
{
|
|
struct gnttab_copy *gop = vif->tx_copy_ops, *request_gop;
|
|
struct sk_buff *skb;
|
|
int ret;
|
|
|
|
while ((nr_pending_reqs(vif) + XEN_NETBK_LEGACY_SLOTS_MAX
|
|
< MAX_PENDING_REQS) &&
|
|
(skb_queue_len(&vif->tx_queue) < budget)) {
|
|
struct xen_netif_tx_request txreq;
|
|
struct xen_netif_tx_request txfrags[XEN_NETBK_LEGACY_SLOTS_MAX];
|
|
struct page *page;
|
|
struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX-1];
|
|
u16 pending_idx;
|
|
RING_IDX idx;
|
|
int work_to_do;
|
|
unsigned int data_len;
|
|
pending_ring_idx_t index;
|
|
|
|
if (vif->tx.sring->req_prod - vif->tx.req_cons >
|
|
XEN_NETIF_TX_RING_SIZE) {
|
|
netdev_err(vif->dev,
|
|
"Impossible number of requests. "
|
|
"req_prod %d, req_cons %d, size %ld\n",
|
|
vif->tx.sring->req_prod, vif->tx.req_cons,
|
|
XEN_NETIF_TX_RING_SIZE);
|
|
xenvif_fatal_tx_err(vif);
|
|
continue;
|
|
}
|
|
|
|
work_to_do = RING_HAS_UNCONSUMED_REQUESTS(&vif->tx);
|
|
if (!work_to_do)
|
|
break;
|
|
|
|
idx = vif->tx.req_cons;
|
|
rmb(); /* Ensure that we see the request before we copy it. */
|
|
memcpy(&txreq, RING_GET_REQUEST(&vif->tx, idx), sizeof(txreq));
|
|
|
|
/* Credit-based scheduling. */
|
|
if (txreq.size > vif->remaining_credit &&
|
|
tx_credit_exceeded(vif, txreq.size))
|
|
break;
|
|
|
|
vif->remaining_credit -= txreq.size;
|
|
|
|
work_to_do--;
|
|
vif->tx.req_cons = ++idx;
|
|
|
|
memset(extras, 0, sizeof(extras));
|
|
if (txreq.flags & XEN_NETTXF_extra_info) {
|
|
work_to_do = xenvif_get_extras(vif, extras,
|
|
work_to_do);
|
|
idx = vif->tx.req_cons;
|
|
if (unlikely(work_to_do < 0))
|
|
break;
|
|
}
|
|
|
|
ret = xenvif_count_requests(vif, &txreq, txfrags, work_to_do);
|
|
if (unlikely(ret < 0))
|
|
break;
|
|
|
|
idx += ret;
|
|
|
|
if (unlikely(txreq.size < ETH_HLEN)) {
|
|
netdev_dbg(vif->dev,
|
|
"Bad packet size: %d\n", txreq.size);
|
|
xenvif_tx_err(vif, &txreq, idx);
|
|
break;
|
|
}
|
|
|
|
/* No crossing a page as the payload mustn't fragment. */
|
|
if (unlikely((txreq.offset + txreq.size) > PAGE_SIZE)) {
|
|
netdev_err(vif->dev,
|
|
"txreq.offset: %x, size: %u, end: %lu\n",
|
|
txreq.offset, txreq.size,
|
|
(txreq.offset&~PAGE_MASK) + txreq.size);
|
|
xenvif_fatal_tx_err(vif);
|
|
break;
|
|
}
|
|
|
|
index = pending_index(vif->pending_cons);
|
|
pending_idx = vif->pending_ring[index];
|
|
|
|
data_len = (txreq.size > PKT_PROT_LEN &&
|
|
ret < XEN_NETBK_LEGACY_SLOTS_MAX) ?
|
|
PKT_PROT_LEN : txreq.size;
|
|
|
|
skb = alloc_skb(data_len + NET_SKB_PAD + NET_IP_ALIGN,
|
|
GFP_ATOMIC | __GFP_NOWARN);
|
|
if (unlikely(skb == NULL)) {
|
|
netdev_dbg(vif->dev,
|
|
"Can't allocate a skb in start_xmit.\n");
|
|
xenvif_tx_err(vif, &txreq, idx);
|
|
break;
|
|
}
|
|
|
|
/* Packets passed to netif_rx() must have some headroom. */
|
|
skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
|
|
|
|
if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) {
|
|
struct xen_netif_extra_info *gso;
|
|
gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1];
|
|
|
|
if (xenvif_set_skb_gso(vif, skb, gso)) {
|
|
/* Failure in xenvif_set_skb_gso is fatal. */
|
|
kfree_skb(skb);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* XXX could copy straight to head */
|
|
page = xenvif_alloc_page(vif, pending_idx);
|
|
if (!page) {
|
|
kfree_skb(skb);
|
|
xenvif_tx_err(vif, &txreq, idx);
|
|
break;
|
|
}
|
|
|
|
gop->source.u.ref = txreq.gref;
|
|
gop->source.domid = vif->domid;
|
|
gop->source.offset = txreq.offset;
|
|
|
|
gop->dest.u.gmfn = virt_to_mfn(page_address(page));
|
|
gop->dest.domid = DOMID_SELF;
|
|
gop->dest.offset = txreq.offset;
|
|
|
|
gop->len = txreq.size;
|
|
gop->flags = GNTCOPY_source_gref;
|
|
|
|
gop++;
|
|
|
|
memcpy(&vif->pending_tx_info[pending_idx].req,
|
|
&txreq, sizeof(txreq));
|
|
vif->pending_tx_info[pending_idx].head = index;
|
|
*((u16 *)skb->data) = pending_idx;
|
|
|
|
__skb_put(skb, data_len);
|
|
|
|
skb_shinfo(skb)->nr_frags = ret;
|
|
if (data_len < txreq.size) {
|
|
skb_shinfo(skb)->nr_frags++;
|
|
frag_set_pending_idx(&skb_shinfo(skb)->frags[0],
|
|
pending_idx);
|
|
} else {
|
|
frag_set_pending_idx(&skb_shinfo(skb)->frags[0],
|
|
INVALID_PENDING_IDX);
|
|
}
|
|
|
|
vif->pending_cons++;
|
|
|
|
request_gop = xenvif_get_requests(vif, skb, txfrags, gop);
|
|
if (request_gop == NULL) {
|
|
kfree_skb(skb);
|
|
xenvif_tx_err(vif, &txreq, idx);
|
|
break;
|
|
}
|
|
gop = request_gop;
|
|
|
|
__skb_queue_tail(&vif->tx_queue, skb);
|
|
|
|
vif->tx.req_cons = idx;
|
|
|
|
if ((gop-vif->tx_copy_ops) >= ARRAY_SIZE(vif->tx_copy_ops))
|
|
break;
|
|
}
|
|
|
|
return gop - vif->tx_copy_ops;
|
|
}
|
|
|
|
|
|
static int xenvif_tx_submit(struct xenvif *vif)
|
|
{
|
|
struct gnttab_copy *gop = vif->tx_copy_ops;
|
|
struct sk_buff *skb;
|
|
int work_done = 0;
|
|
|
|
while ((skb = __skb_dequeue(&vif->tx_queue)) != NULL) {
|
|
struct xen_netif_tx_request *txp;
|
|
u16 pending_idx;
|
|
unsigned data_len;
|
|
|
|
pending_idx = *((u16 *)skb->data);
|
|
txp = &vif->pending_tx_info[pending_idx].req;
|
|
|
|
/* Check the remap error code. */
|
|
if (unlikely(xenvif_tx_check_gop(vif, skb, &gop))) {
|
|
netdev_dbg(vif->dev, "netback grant failed.\n");
|
|
skb_shinfo(skb)->nr_frags = 0;
|
|
kfree_skb(skb);
|
|
continue;
|
|
}
|
|
|
|
data_len = skb->len;
|
|
memcpy(skb->data,
|
|
(void *)(idx_to_kaddr(vif, pending_idx)|txp->offset),
|
|
data_len);
|
|
if (data_len < txp->size) {
|
|
/* Append the packet payload as a fragment. */
|
|
txp->offset += data_len;
|
|
txp->size -= data_len;
|
|
} else {
|
|
/* Schedule a response immediately. */
|
|
xenvif_idx_release(vif, pending_idx,
|
|
XEN_NETIF_RSP_OKAY);
|
|
}
|
|
|
|
if (txp->flags & XEN_NETTXF_csum_blank)
|
|
skb->ip_summed = CHECKSUM_PARTIAL;
|
|
else if (txp->flags & XEN_NETTXF_data_validated)
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
|
|
xenvif_fill_frags(vif, skb);
|
|
|
|
if (skb_is_nonlinear(skb) && skb_headlen(skb) < PKT_PROT_LEN) {
|
|
int target = min_t(int, skb->len, PKT_PROT_LEN);
|
|
__pskb_pull_tail(skb, target - skb_headlen(skb));
|
|
}
|
|
|
|
skb->dev = vif->dev;
|
|
skb->protocol = eth_type_trans(skb, skb->dev);
|
|
skb_reset_network_header(skb);
|
|
|
|
if (checksum_setup(vif, skb)) {
|
|
netdev_dbg(vif->dev,
|
|
"Can't setup checksum in net_tx_action\n");
|
|
kfree_skb(skb);
|
|
continue;
|
|
}
|
|
|
|
skb_probe_transport_header(skb, 0);
|
|
|
|
/* If the packet is GSO then we will have just set up the
|
|
* transport header offset in checksum_setup so it's now
|
|
* straightforward to calculate gso_segs.
|
|
*/
|
|
if (skb_is_gso(skb)) {
|
|
int mss = skb_shinfo(skb)->gso_size;
|
|
int hdrlen = skb_transport_header(skb) -
|
|
skb_mac_header(skb) +
|
|
tcp_hdrlen(skb);
|
|
|
|
skb_shinfo(skb)->gso_segs =
|
|
DIV_ROUND_UP(skb->len - hdrlen, mss);
|
|
}
|
|
|
|
vif->dev->stats.rx_bytes += skb->len;
|
|
vif->dev->stats.rx_packets++;
|
|
|
|
work_done++;
|
|
|
|
netif_receive_skb(skb);
|
|
}
|
|
|
|
return work_done;
|
|
}
|
|
|
|
/* Called after netfront has transmitted */
|
|
int xenvif_tx_action(struct xenvif *vif, int budget)
|
|
{
|
|
unsigned nr_gops;
|
|
int work_done;
|
|
|
|
if (unlikely(!tx_work_todo(vif)))
|
|
return 0;
|
|
|
|
nr_gops = xenvif_tx_build_gops(vif, budget);
|
|
|
|
if (nr_gops == 0)
|
|
return 0;
|
|
|
|
gnttab_batch_copy(vif->tx_copy_ops, nr_gops);
|
|
|
|
work_done = xenvif_tx_submit(vif);
|
|
|
|
return work_done;
|
|
}
|
|
|
|
static void xenvif_idx_release(struct xenvif *vif, u16 pending_idx,
|
|
u8 status)
|
|
{
|
|
struct pending_tx_info *pending_tx_info;
|
|
pending_ring_idx_t head;
|
|
u16 peek; /* peek into next tx request */
|
|
|
|
BUG_ON(vif->mmap_pages[pending_idx] == (void *)(~0UL));
|
|
|
|
/* Already complete? */
|
|
if (vif->mmap_pages[pending_idx] == NULL)
|
|
return;
|
|
|
|
pending_tx_info = &vif->pending_tx_info[pending_idx];
|
|
|
|
head = pending_tx_info->head;
|
|
|
|
BUG_ON(!pending_tx_is_head(vif, head));
|
|
BUG_ON(vif->pending_ring[pending_index(head)] != pending_idx);
|
|
|
|
do {
|
|
pending_ring_idx_t index;
|
|
pending_ring_idx_t idx = pending_index(head);
|
|
u16 info_idx = vif->pending_ring[idx];
|
|
|
|
pending_tx_info = &vif->pending_tx_info[info_idx];
|
|
make_tx_response(vif, &pending_tx_info->req, status);
|
|
|
|
/* Setting any number other than
|
|
* INVALID_PENDING_RING_IDX indicates this slot is
|
|
* starting a new packet / ending a previous packet.
|
|
*/
|
|
pending_tx_info->head = 0;
|
|
|
|
index = pending_index(vif->pending_prod++);
|
|
vif->pending_ring[index] = vif->pending_ring[info_idx];
|
|
|
|
peek = vif->pending_ring[pending_index(++head)];
|
|
|
|
} while (!pending_tx_is_head(vif, peek));
|
|
|
|
put_page(vif->mmap_pages[pending_idx]);
|
|
vif->mmap_pages[pending_idx] = NULL;
|
|
}
|
|
|
|
|
|
static void make_tx_response(struct xenvif *vif,
|
|
struct xen_netif_tx_request *txp,
|
|
s8 st)
|
|
{
|
|
RING_IDX i = vif->tx.rsp_prod_pvt;
|
|
struct xen_netif_tx_response *resp;
|
|
int notify;
|
|
|
|
resp = RING_GET_RESPONSE(&vif->tx, i);
|
|
resp->id = txp->id;
|
|
resp->status = st;
|
|
|
|
if (txp->flags & XEN_NETTXF_extra_info)
|
|
RING_GET_RESPONSE(&vif->tx, ++i)->status = XEN_NETIF_RSP_NULL;
|
|
|
|
vif->tx.rsp_prod_pvt = ++i;
|
|
RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&vif->tx, notify);
|
|
if (notify)
|
|
notify_remote_via_irq(vif->tx_irq);
|
|
}
|
|
|
|
static struct xen_netif_rx_response *make_rx_response(struct xenvif *vif,
|
|
u16 id,
|
|
s8 st,
|
|
u16 offset,
|
|
u16 size,
|
|
u16 flags)
|
|
{
|
|
RING_IDX i = vif->rx.rsp_prod_pvt;
|
|
struct xen_netif_rx_response *resp;
|
|
|
|
resp = RING_GET_RESPONSE(&vif->rx, i);
|
|
resp->offset = offset;
|
|
resp->flags = flags;
|
|
resp->id = id;
|
|
resp->status = (s16)size;
|
|
if (st < 0)
|
|
resp->status = (s16)st;
|
|
|
|
vif->rx.rsp_prod_pvt = ++i;
|
|
|
|
return resp;
|
|
}
|
|
|
|
static inline int rx_work_todo(struct xenvif *vif)
|
|
{
|
|
return !skb_queue_empty(&vif->rx_queue) &&
|
|
xenvif_rx_ring_slots_available(vif, vif->rx_last_skb_slots);
|
|
}
|
|
|
|
static inline int tx_work_todo(struct xenvif *vif)
|
|
{
|
|
|
|
if (likely(RING_HAS_UNCONSUMED_REQUESTS(&vif->tx)) &&
|
|
(nr_pending_reqs(vif) + XEN_NETBK_LEGACY_SLOTS_MAX
|
|
< MAX_PENDING_REQS))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void xenvif_unmap_frontend_rings(struct xenvif *vif)
|
|
{
|
|
if (vif->tx.sring)
|
|
xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif),
|
|
vif->tx.sring);
|
|
if (vif->rx.sring)
|
|
xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif),
|
|
vif->rx.sring);
|
|
}
|
|
|
|
int xenvif_map_frontend_rings(struct xenvif *vif,
|
|
grant_ref_t tx_ring_ref,
|
|
grant_ref_t rx_ring_ref)
|
|
{
|
|
void *addr;
|
|
struct xen_netif_tx_sring *txs;
|
|
struct xen_netif_rx_sring *rxs;
|
|
|
|
int err = -ENOMEM;
|
|
|
|
err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(vif),
|
|
tx_ring_ref, &addr);
|
|
if (err)
|
|
goto err;
|
|
|
|
txs = (struct xen_netif_tx_sring *)addr;
|
|
BACK_RING_INIT(&vif->tx, txs, PAGE_SIZE);
|
|
|
|
err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(vif),
|
|
rx_ring_ref, &addr);
|
|
if (err)
|
|
goto err;
|
|
|
|
rxs = (struct xen_netif_rx_sring *)addr;
|
|
BACK_RING_INIT(&vif->rx, rxs, PAGE_SIZE);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
xenvif_unmap_frontend_rings(vif);
|
|
return err;
|
|
}
|
|
|
|
void xenvif_stop_queue(struct xenvif *vif)
|
|
{
|
|
if (!vif->can_queue)
|
|
return;
|
|
|
|
netif_stop_queue(vif->dev);
|
|
}
|
|
|
|
static void xenvif_start_queue(struct xenvif *vif)
|
|
{
|
|
if (xenvif_schedulable(vif))
|
|
netif_wake_queue(vif->dev);
|
|
}
|
|
|
|
int xenvif_kthread(void *data)
|
|
{
|
|
struct xenvif *vif = data;
|
|
struct sk_buff *skb;
|
|
|
|
while (!kthread_should_stop()) {
|
|
wait_event_interruptible(vif->wq,
|
|
rx_work_todo(vif) ||
|
|
kthread_should_stop());
|
|
if (kthread_should_stop())
|
|
break;
|
|
|
|
if (!skb_queue_empty(&vif->rx_queue))
|
|
xenvif_rx_action(vif);
|
|
|
|
if (skb_queue_empty(&vif->rx_queue) &&
|
|
netif_queue_stopped(vif->dev))
|
|
xenvif_start_queue(vif);
|
|
|
|
cond_resched();
|
|
}
|
|
|
|
/* Bin any remaining skbs */
|
|
while ((skb = skb_dequeue(&vif->rx_queue)) != NULL)
|
|
dev_kfree_skb(skb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init netback_init(void)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (!xen_domain())
|
|
return -ENODEV;
|
|
|
|
if (fatal_skb_slots < XEN_NETBK_LEGACY_SLOTS_MAX) {
|
|
pr_info("fatal_skb_slots too small (%d), bump it to XEN_NETBK_LEGACY_SLOTS_MAX (%d)\n",
|
|
fatal_skb_slots, XEN_NETBK_LEGACY_SLOTS_MAX);
|
|
fatal_skb_slots = XEN_NETBK_LEGACY_SLOTS_MAX;
|
|
}
|
|
|
|
rc = xenvif_xenbus_init();
|
|
if (rc)
|
|
goto failed_init;
|
|
|
|
return 0;
|
|
|
|
failed_init:
|
|
return rc;
|
|
}
|
|
|
|
module_init(netback_init);
|
|
|
|
static void __exit netback_fini(void)
|
|
{
|
|
xenvif_xenbus_fini();
|
|
}
|
|
module_exit(netback_fini);
|
|
|
|
MODULE_LICENSE("Dual BSD/GPL");
|
|
MODULE_ALIAS("xen-backend:vif");
|