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/*
* Copyright (c) 2007 Mellanox Technologies. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#include "opt_inet.h"
#include "mlx4_en.h"
#ifdef INET
#include <net/ethernet.h>
#include <netinet/ip.h>
#include <machine/in_cksum.h>
static struct mlx4_en_ipfrag *find_session(struct mlx4_en_rx_ring *ring,
struct ip *iph)
{
struct mlx4_en_ipfrag *session;
int i;
for (i = 0; i < MLX4_EN_NUM_IPFRAG_SESSIONS; i++) {
session = &ring->ipfrag[i];
if (session->fragments == NULL)
continue;
if (session->daddr == iph->ip_dst.s_addr &&
session->saddr == iph->ip_src.s_addr &&
session->id == iph->ip_id &&
session->protocol == iph->ip_p) {
return session;
}
}
return NULL;
}
static struct mlx4_en_ipfrag *start_session(struct mlx4_en_rx_ring *ring,
struct ip *iph)
{
struct mlx4_en_ipfrag *session;
int index = -1;
int i;
for (i = 0; i < MLX4_EN_NUM_IPFRAG_SESSIONS; i++) {
if (ring->ipfrag[i].fragments == NULL) {
index = i;
break;
}
}
if (index < 0)
return NULL;
session = &ring->ipfrag[index];
return session;
}
static void flush_session(struct mlx4_en_priv *priv,
struct mlx4_en_ipfrag *session,
u16 more)
{
struct mbuf *mb = session->fragments;
struct ip *iph = mb->m_pkthdr.PH_loc.ptr;
struct net_device *dev = mb->m_pkthdr.rcvif;
/* Update IP length and checksum */
iph->ip_len = htons(session->total_len);
iph->ip_off = htons(more | (session->offset >> 3));
iph->ip_sum = 0;
iph->ip_sum = in_cksum_skip(mb, iph->ip_hl * 4,
(char *)iph - mb->m_data);
dev->if_input(dev, mb);
session->fragments = NULL;
session->last = NULL;
}
static inline void frag_append(struct mlx4_en_priv *priv,
struct mlx4_en_ipfrag *session,
struct mbuf *mb,
unsigned int data_len)
{
struct mbuf *parent = session->fragments;
/* Update mb bookkeeping */
parent->m_pkthdr.len += data_len;
session->total_len += data_len;
m_adj(mb, mb->m_pkthdr.len - data_len);
session->last->m_next = mb;
for (; mb->m_next != NULL; mb = mb->m_next);
session->last = mb;
}
int mlx4_en_rx_frags(struct mlx4_en_priv *priv, struct mlx4_en_rx_ring *ring,
struct mbuf *mb, struct mlx4_cqe *cqe)
{
struct mlx4_en_ipfrag *session;
struct ip *iph;
u16 ip_len;
u16 ip_hlen;
int data_len;
u16 offset;
iph = (struct ip *)(mtod(mb, char *) + ETHER_HDR_LEN);
mb->m_pkthdr.PH_loc.ptr = iph;
ip_len = ntohs(iph->ip_len);
ip_hlen = iph->ip_hl * 4;
data_len = ip_len - ip_hlen;
offset = ntohs(iph->ip_off);
offset &= IP_OFFMASK;
offset <<= 3;
session = find_session(ring, iph);
if (unlikely(in_cksum_skip(mb, ip_hlen, (char *)iph - mb->m_data))) {
if (session)
flush_session(priv, session, IP_MF);
return -EINVAL;
}
if (session) {
if (unlikely(session->offset + session->total_len !=
offset + ip_hlen ||
session->total_len + mb->m_pkthdr.len > 65536)) {
flush_session(priv, session, IP_MF);
goto new_session;
}
frag_append(priv, session, mb, data_len);
} else {
new_session:
session = start_session(ring, iph);
if (unlikely(!session))
return -ENOSPC;
session->fragments = mb;
session->daddr = iph->ip_dst.s_addr;
session->saddr = iph->ip_src.s_addr;
session->id = iph->ip_id;
session->protocol = iph->ip_p;
session->total_len = ip_len;
session->offset = offset;
for (; mb->m_next != NULL; mb = mb->m_next);
session->last = mb;
}
if (!(ntohs(iph->ip_off) & IP_MF))
flush_session(priv, session, 0);
return 0;
}
void mlx4_en_flush_frags(struct mlx4_en_priv *priv,
struct mlx4_en_rx_ring *ring)
{
struct mlx4_en_ipfrag *session;
int i;
for (i = 0; i < MLX4_EN_NUM_IPFRAG_SESSIONS; i++) {
session = &ring->ipfrag[i];
if (session->fragments)
flush_session(priv, session, IP_MF);
}
}
#endif
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