- 02 Oct, 2014 15 commits
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Alexei Starovoitov authored
This patch demonstrates the effect of delaying update of HW tailptr. (based on earlier patch by Jesper) burst=1 is the default. It sends one packet with xmit_more=false burst=2 sends one packet with xmit_more=true and 2nd copy of the same packet with xmit_more=false burst=3 sends two copies of the same packet with xmit_more=true and 3rd copy with xmit_more=false Performance with ixgbe (usec 30): burst=1 tx:9.2 Mpps burst=2 tx:13.5 Mpps burst=3 tx:14.5 Mpps full 10G line rate Signed-off-by:Alexei Starovoitov <ast@plumgrid.com> Signed-off-by:
Eric Dumazet <edumazet@google.com> Acked-by:
Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Florian Fainelli authored
In preparation for being able to propagate port states to e.g: notifiers or other kernel parts, do not manipulate the port state directly, but instead use a helper function which will allow us to do a bit more than just setting the state. Signed-off-by:
Florian Fainelli <f.fainelli@gmail.com> Signed-off-by:
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WANG Cong authored
This fixes the following crash: [ 63.976822] general protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC [ 63.980094] CPU: 1 PID: 15 Comm: ksoftirqd/1 Not tainted 3.17.0-rc6+ #648 [ 63.980094] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 63.980094] task: ffff880117dea690 ti: ffff880117dfc000 task.ti: ffff880117dfc000 [ 63.980094] RIP: 0010:[<ffffffff817e6d07>] [<ffffffff817e6d07>] u32_destroy_key+0x27/0x6d [ 63.980094] RSP: 0018:ffff880117dffcc0 EFLAGS: 00010202 [ 63.980094] RAX: ffff880117dea690 RBX: ffff8800d02e0820 RCX: 0000000000000000 [ 63.980094] RDX: 0000000000000001 RSI: 0000000000000002 RDI: 6b6b6b6b6b6b6b6b [ 63.980094] RBP: ffff880117dffcd0 R08: 0000000000000000 R09: 0000000000000000 [ 63.980094] R10: 00006c0900006ba8 R11: 00006ba100006b9d R12: 0000000000000001 [ 63.980094] R13: ffff8800d02e0898 R14: ffffffff817e6d4d R15: ffff880117387a30 [ 63.980094] FS: 0000000000000000(0000) GS:ffff88011a800000(0000) knlGS:0000000000000000 [ 63.980094] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 63.980094] CR2: 00007f07e6732fed CR3: 000000011665b000 CR4: 00000000000006e0 [ 63.980094] Stack: [ 63.980094] ffff88011a9cd300 ffffffff82051ac0 ffff880117dffce0 ffffffff817e6d68 [ 63.980094] ffff880117dffd70 ffffffff810cb4c7 ffffffff810cb3cd ffff880117dfffd8 [ 63.980094] ffff880117dea690 ffff880117dea690 ffff880117dfffd8 000000000000000a [ 63.980094] Call Trace: [ 63.980094] [<ffffffff817e6d68>] u32_delete_key_freepf_rcu+0x1b/0x1d [ 63.980094] [<ffffffff810cb4c7>] rcu_process_callbacks+0x3bb/0x691 [ 63.980094] [<ffffffff810cb3cd>] ? rcu_process_callbacks+0x2c1/0x691 [ 63.980094] [<ffffffff817e6d4d>] ? u32_destroy_key+0x6d/0x6d [ 63.980094] [<ffffffff810780a4>] __do_softirq+0x142/0x323 [ 63.980094] [<ffffffff810782a8>] run_ksoftirqd+0x23/0x53 [ 63.980094] [<ffffffff81092126>] smpboot_thread_fn+0x203/0x221 [ 63.980094] [<ffffffff81091f23>] ? smpboot_unpark_thread+0x33/0x33 [ 63.980094] [<ffffffff8108e44d>] kthread+0xc9/0xd1 [ 63.980094] [<ffffffff819e00ea>] ? do_wait_for_common+0xf8/0x125 [ 63.980094] [<ffffffff8108e384>] ? __kthread_parkme+0x61/0x61 [ 63.980094] [<ffffffff819e43ec>] ret_from_fork+0x7c/0xb0 [ 63.980094] [<ffffffff8108e384>] ? __kthread_parkme+0x61/0x61 tp could be freed in call_rcu callback too, the order is not guaranteed. John Fastabend says: ==================== Its worth noting why this is safe. Any running schedulers will either read the valid class field or it will be zeroed. All schedulers today when the class is 0 do a lookup using the same call used by the tcf_exts_bind(). So even if we have a running classifier hit the null class pointer it will do a lookup and get to the same result. This is particularly fragile at the moment because the only way to verify this is to audit the schedulers call sites. ==================== Cc: John Fastabend <john.r.fastabend@intel.com> Signed-off-by:
Cong Wang <xiyou.wangcong@gmail.com> Acked-by:
John Fastabend <john.r.fastabend@intel.com> Signed-off-by:
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WANG Cong authored
This patch fixes the following crash: [ 166.670795] BUG: unable to handle kernel NULL pointer dereference at (null) [ 166.674230] IP: [<ffffffff814b739f>] __list_del_entry+0x5c/0x98 [ 166.674230] PGD d0ea5067 PUD ce7fc067 PMD 0 [ 166.674230] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC [ 166.674230] CPU: 1 PID: 775 Comm: tc Not tainted 3.17.0-rc6+ #642 [ 166.674230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 166.674230] task: ffff8800d03c4d20 ti: ffff8800cae7c000 task.ti: ffff8800cae7c000 [ 166.674230] RIP: 0010:[<ffffffff814b739f>] [<ffffffff814b739f>] __list_del_entry+0x5c/0x98 [ 166.674230] RSP: 0018:ffff8800cae7f7d0 EFLAGS: 00010207 [ 166.674230] RAX: 0000000000000000 RBX: ffff8800cba8d700 RCX: ffff8800cba8d700 [ 166.674230] RDX: 0000000000000000 RSI: dead000000200200 RDI: ffff8800cba8d700 [ 166.674230] RBP: ffff8800cae7f7d0 R08: 0000000000000001 R09: 0000000000000001 [ 166.674230] R10: 0000000000000000 R11: 000000000000859a R12: ffffffffffffffe8 [ 166.674230] R13: ffff8800cba8c5b8 R14: 0000000000000001 R15: ffff8800cba8d700 [ 166.674230] FS: 00007fdb5f04a740(0000) GS:ffff88011a800000(0000) knlGS:0000000000000000 [ 166.674230] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 166.674230] CR2: 0000000000000000 CR3: 00000000cf929000 CR4: 00000000000006e0 [ 166.674230] Stack: [ 166.674230] ffff8800cae7f7e8 ffffffff814b73e8 ffff8800cba8d6e8 ffff8800cae7f828 [ 166.674230] ffffffff817caeec 0000000000000046 ffff8800cba8c5b0 ffff8800cba8c5b8 [ 166.674230] 0000000000000000 0000000000000001 ffff8800cf8e33e8 ffff8800cae7f848 [ 166.674230] Call Trace: [ 166.674230] [<ffffffff814b73e8>] list_del+0xd/0x2b [ 166.674230] [<ffffffff817caeec>] tcf_action_destroy+0x4c/0x71 [ 166.674230] [<ffffffff817ca0ce>] tcf_exts_destroy+0x20/0x2d [ 166.674230] [<ffffffff817ec2b5>] tcindex_delete+0x196/0x1b7 struct list_head can not be simply copied and we should always init it. Cc: John Fastabend <john.r.fastabend@intel.com> Signed-off-by:
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David S. Miller authored
Tom Herbert says: ==================== udp: Generalize GSO for UDP tunnels This patch set generalizes the UDP tunnel segmentation functions so that they can work with various protocol encapsulations. The primary change is to set the inner_protocol field in the skbuff when creating the encapsulated packet, and then in skb_udp_tunnel_segment this data is used to determine the function for segmenting the encapsulated packet. The inner_protocol field is overloaded to take either an Ethertype or IP protocol. The inner_protocol is set on transmit using skb_set_inner_ipproto or skb_set_inner_protocol functions. VXLAN and IP tunnels (for fou GSO) were modified to call these. Notes: - GSO for GRE/UDP where GRE checksum is enabled does not work. Handling this will require some special case code. - Software GSO now supports many varieties of encapsulation with SKB_GSO_UDP_TUNNEL{_CSUM}. We still need a mechanism to query for device support of particular combinations (I intend to add ndo_gso_check for that). - MPLS seems to be the only previous user of inner_protocol. I don't believe these patches can affect that. For supporting GSO with MPLS over UDP, the inner_protocol should be set using the helper functions in this patch. - GSO for L2TP/UDP should also be straightforward now. v2: - Respin for Eric's restructuring of skbuff. Tested GRE, IPIP, and SIT over fou as well as VLXAN. This was done using 200 TCP_STREAMs in netperf. GRE IPv4, FOU, UDP checksum enabled TCP_STREAM TSO enabled on tun interface 14.04% TX CPU utilization 13.17% RX CPU utilization 9211 Mbps TCP_STREAM TSO disabled on tun interface 27.82% TX CPU utilization 25.41% RX CPU utilization 9336 Mbps IPv4, FOU, UDP checksum disabled TCP_STREAM TSO enabled on tun interface 13.14% TX CPU utilization 23.18% RX CPU utilization 9277 Mbps TCP_STREAM TSO disabled on tun interface 30.00% TX CPU utilization 31.28% RX CPU utilization 9327 Mbps IPIP FOU, UDP checksum enabled TCP_STREAM TSO enabled on tun interface 15.28% TX CPU utilization 13.92% RX CPU utilization 9342 Mbps TCP_STREAM TSO disabled on tun interface 27.82% TX CPU utilization 25.41% RX CPU utilization 9336 Mbps FOU, UDP checksum disabled TCP_STREAM TSO enabled on tun interface 15.08% TX CPU utilization 24.64% RX CPU utilization 9226 Mbps TCP_STREAM TSO disabled on tun interface 30.00% TX CPU utilization 31.28% RX CPU utilization 9327 Mbps SIT FOU, UDP checksum enabled TCP_STREAM TSO enabled on tun interface 14.47% TX CPU utilization 14.58% RX CPU utilization 9106 Mbps TCP_STREAM TSO disabled on tun interface 31.82% TX CPU utilization 30.82% RX CPU utilization 9204 Mbps FOU, UDP checksum disabled TCP_STREAM TSO enabled on tun interface 15.70% TX CPU utilization 27.93% RX CPU utilization 9097 Mbps TCP_STREAM TSO disabled on tun interface 33.48% TX CPU utilization 37.36% RX CPU utilization 9197 Mbps VXLAN TCP_STREAM TSO enabled on tun interface 16.42% TX CPU utilization 23.66% RX CPU utilization 9081 Mbps TCP_STREAM TSO disabled on tun interface 30.32% TX CPU utilization 30.55% RX CPU utilization 9185 Mbps Baseline (no encp, TSO and LRO enabled) TCP_STREAM 11.85% TX CPU utilization 15.13% RX CPU utilization 9452 Mbps ==================== Signed-off-by: -
Tom Herbert authored
Call skb_set_inner_protocol to set inner Ethernet protocol to ETH_P_TEB before transmit. This is needed for GSO with UDP tunnels. Signed-off-by:
Tom Herbert <therbert@google.com> Signed-off-by:
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Tom Herbert authored
Call skb_set_inner_protocol to set inner Ethernet protocol to protocol being encapsulation by GRE before tunnel_xmit. This is needed for GSO if UDP encapsulation (fou) is being done. Signed-off-by:
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Tom Herbert authored
Call skb_set_inner_ipproto to set inner IP protocol to IPPROTO_IPV4 before tunnel_xmit. This is needed if UDP encapsulation (fou) is being done. Signed-off-by:
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Tom Herbert authored
Call skb_set_inner_ipproto to set inner IP protocol to IPPROTO_IPV6 before tunnel_xmit. This is needed if UDP encapsulation (fou) is being done. Signed-off-by:
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Tom Herbert authored
skb_udp_segment is the function called from udp4_ufo_fragment to segment a UDP tunnel packet. This function currently assumes segmentation is transparent Ethernet bridging (i.e. VXLAN encapsulation). This patch generalizes the function to operate on either Ethertype or IP protocol. The inner_protocol field must be set to the protocol of the inner header. This can now be either an Ethertype or an IP protocol (in a union). A new flag in the skbuff indicates which type is effective. skb_set_inner_protocol and skb_set_inner_ipproto helper functions were added to set the inner_protocol. These functions are called from the point where the tunnel encapsulation is occuring. When skb_udp_tunnel_segment is called, the function to segment the inner packet is selected based on the inner IP or Ethertype. In the case of an IP protocol encapsulation, the function is derived from inet[6]_offloads. In the case of Ethertype, skb->protocol is set to the inner_protocol and skb_mac_gso_segment is called. (GRE currently does this, but it might be possible to lookup the protocol in offload_base and call the appropriate segmenation function directly). Signed-off-by:
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David S. Miller authored
Alexei Starovoitov says: ==================== bpf: add search pruning optimization and tests patch #1 commit log explains why eBPF verifier has to examine some instructions multiple times and describes the search pruning optimization that improves verification speed for branchy programs and allows more complex programs to be verified successfully. This patch completes the core verifier logic. patch #2 adds more verifier tests related to branches and search pruning I'm still working on Andy's 'bitmask for stack slots' suggestion. It will be done on top of this patch. The current verifier algorithm is brute force depth first search with state pruning. If anyone can come up with another algorithm that demonstrates better results, we'll replace the algorithm without affecting user space. Note verifier doesn't guarantee that all possible valid programs are accepted. Overly complex programs may still be rejected. Verifier improvements/optimizations will guarantee that if a program was passing verification in the past, it will still be passing. ==================== Signed-off-by: -
Alexei Starovoitov authored
add 4 extra tests to cover jump verification better Signed-off-by:
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Alexei Starovoitov authored
consider C program represented in eBPF: int filter(int arg) { int a, b, c, *ptr; if (arg == 1) ptr = &a; else if (arg == 2) ptr = &b; else ptr = &c; *ptr = 0; return 0; } eBPF verifier has to follow all possible paths through the program to recognize that '*ptr = 0' instruction would be safe to execute in all situations. It's doing it by picking a path towards the end and observes changes to registers and stack at every insn until it reaches bpf_exit. Then it comes back to one of the previous branches and goes towards the end again with potentially different values in registers. When program has a lot of branches, the number of possible combinations of branches is huge, so verifer has a hard limit of walking no more than 32k instructions. This limit can be reached and complex (but valid) programs could be rejected. Therefore it's important to recognize equivalent verifier states to prune this depth first search. Basic idea can be illustrated by the program (where .. are some eBPF insns): 1: .. 2: if (rX == rY) goto 4 3: .. 4: .. 5: .. 6: bpf_exit In the first pass towards bpf_exit the verifier will walk insns: 1, 2, 3, 4, 5, 6 Since insn#2 is a branch the verifier will remember its state in verifier stack to come back to it later. Since insn#4 is marked as 'branch target', the verifier will remember its state in explored_states[4] linked list. Once it reaches insn#6 successfully it will pop the state recorded at insn#2 and will continue. Without search pruning optimization verifier would have to walk 4, 5, 6 again, effectively simulating execution of insns 1, 2, 4, 5, 6 With search pruning it will check whether state at #4 after jumping from #2 is equivalent to one recorded in explored_states[4] during first pass. If there is an equivalent state, verifier can prune the search at #4 and declare this path to be safe as well. In other words two states at #4 are equivalent if execution of 1, 2, 3, 4 insns and 1, 2, 4 insns produces equivalent registers and stack. Signed-off-by: -
Nimrod Andy authored
- Copy short frames and keep the buffers mapped, re-allocate skb instead of memory copy for long frames. - Add support for setting/getting rx_copybreak using generic ethtool tunable Changes V3: * As Eric Dumazet's suggestion that removing the copybreak module parameter and only keep the ethtool API support for rx_copybreak. Changes V2: * Implements rx_copybreak * Rx_copybreak provides module parameter to change this value * Add tunable_ops support for rx_copybreak Signed-off-by:
Fugang Duan <B38611@freescale.com> Signed-off-by:
Frank Li <Frank.Li@freescale.com> Signed-off-by:
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Eric Dumazet authored
Fast clone cloning can actually avoid an atomic_inc(), if we guarantee prior clone_ref value is 1. This requires a change kfree_skbmem(), to perform the atomic_dec_and_test() on clone_ref before setting fclone to SKB_FCLONE_UNAVAILABLE. Signed-off-by:
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- 01 Oct, 2014 24 commits
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Fabian Frederick authored
ccid_activate is only called by __init ccid_initialize_builtins in same module. Signed-off-by:
Fabian Frederick <fabf@skynet.be> Signed-off-by:
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Fabian Frederick authored
dccp_mib_init is only called by __init dccp_init in same module. Signed-off-by:
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Florian Westphal authored
tested on RTL8168d/8111d model using 'super_netperf 40' with TCP/UDP_STREAM. Output of while true; do for n in inflight limit; do echo -n $n\ ; cat $n; done; sleep 1; done during netperf run, 100mbit peer: inflight 0 limit 3028 inflight 6056 limit 4542 [ trimmed output for brevity, no limit/inflight changes during test steady-state ] limit 4542 inflight 3028 limit 6122 inflight 0 limit 6122 [ changed cable to 1gbit peer, restart netperf ] inflight 37850 limit 36336 inflight 33308 limit 31794 inflight 33308 limit 31794 inflight 27252 limit 25738 [ again, no changes during test ] inflight 27252 limit 25738 inflight 0 limit 28766 [ change cable to 100mbit peer, restart netperf ] limit 28766 inflight 27370 limit 28766 inflight 4542 limit 5990 inflight 6056 limit 4542 [ .. ] inflight 6056 limit 4542 inflight 0 [end of test] Cc: Francois Romieu <romieu@fr.zoreil.com> Cc: Hayes Wang <hayeswang@realtek.com> Signed-off-by:Florian Westphal <fw@strlen.de> Acked-by:
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Eric Dumazet authored
Lets use a proper structure to clearly document and implement skb fast clones. Then, we might experiment more easily alternative layouts. This patch adds a new skb_fclone_busy() helper, used by tcp and xfrm, to stop leaking of implementation details. Signed-off-by:
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Yuchung Cheng authored
Currently we have two different policies for orphan sockets that repeatedly stall on zero window ACKs. If a socket gets a zero window ACK when it is transmitting data, the RTO is used to probe the window. The socket is aborted after roughly tcp_orphan_retries() retries (as in tcp_write_timeout()). But if the socket was idle when it received the zero window ACK, and later wants to send more data, we use the probe timer to probe the window. If the receiver always returns zero window ACKs, icsk_probes keeps getting reset in tcp_ack() and the orphan socket can stall forever until the system reaches the orphan limit (as commented in tcp_probe_timer()). This opens up a simple attack to create lots of hanging orphan sockets to burn the memory and the CPU, as demonstrated in the recent netdev post "TCP connection will hang in FIN_WAIT1 after closing if zero window is advertised." http://www.spinics.net/lists/netdev/msg296539.html This patch follows the design in RTO-based probe: we abort an orphan socket stalling on zero window when the probe timer reaches both the maximum backoff and the maximum RTO. For example, an 100ms RTT connection will timeout after roughly 153 seconds (0.3 + 0.6 + .... + 76.8) if the receiver keeps the window shut. If the orphan socket passes this check, but the system already has too many orphans (as in tcp_out_of_resources()), we still abort it but we'll also send an RST packet as the connection may still be active. In addition, we change TCP_USER_TIMEOUT to cover (life or dead) sockets stalled on zero-window probes. This changes the semantics of TCP_USER_TIMEOUT slightly because it previously only applies when the socket has pending transmission. Signed-off-by:
Yuchung Cheng <ycheng@google.com> Signed-off-by:
Neal Cardwell <ncardwell@google.com> Reported-by:
Andrey Dmitrov <andrey.dmitrov@oktetlabs.ru> Signed-off-by:
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Fabian Frederick authored
cipso_v4_cache_init is only called by __init cipso_v4_init Signed-off-by:
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Fabian Frederick authored
ip4_frags_ctl_register is only called by __init ipfrag_init Signed-off-by:
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Fabian Frederick authored
tcp_init_mem is only called by __init tcp_init. Signed-off-by:
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Chun-Hao Lin authored
These two functions are used to inform dash firmware that driver is been brought up or brought down. So call these two functions only when hardware dash function is enabled. Signed-off-by:
Chun-Hao Lin <hau@realtek.com> Signed-off-by:
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Chun-Hao Lin authored
In function "rtl8168_oob_notify", using function "rtl_eri_write" to access eri register 0xe8, instead of using MAC register "ERIDR" and "ERIAR" to access it. For using function "rtl_eri_write" in function "rtl8168_oob_notify", need to move down "rtl8168_oob_notify" related functions under the function "rtl_eri_write". Signed-off-by:
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Chun-Hao Lin authored
DASH function not only RTL8168DP can support, but also RTL8168EP. So change the name of function "r8168dp_check_dash" to "r8168_check_dash". Signed-off-by:
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Chun-Hao Lin authored
Change the name of function "rtl_w1w0_eri" to "rtl_w0w1_eri". In this function, the local variable "val" is "write zeros then write ones". Please see below code. (val & ~m) | p In this patch, change the function name from "xx_w1w0_xx" to "xx_w0w1_xx". The changed function name is more suitable for it's behavior. Signed-off-by:
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Chun-Hao Lin authored
Change function name from "rtl_w1w0_phy" to "rtl_w0w1_phy". And its behavior from "write ones then write zeros" to "write zeros then write ones". In Realtek internal driver, bitwise operations are almost "write zeros then write ones". For easy to port hardware parameters from Realtek internal driver to Linux kernal driver "r8169", we would like to change this function's behavior and its name. Signed-off-by:
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Chun-Hao Lin authored
For RTL8168F RTL8168FB RTL8168G RTL8168GU RTL8411 RTL8411B RTL8402 RTL8107E, the magic packet enable bit is changed to eri 0xde bit0. In this patch, change magic packet enable bit of these chips to eri 0xde bit0. Signed-off-by:
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Chun-Hao Lin authored
RTL8168FB RTL8168G RTL8168GU RTL8411 RTL8411B RTL8106EUS RTL8402 can support get mac address from backup mac address register. Signed-off-by:
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Chun-Hao Lin authored
RTL8411B can support disable/enable pll function. Signed-off-by:
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Chun-Hao Lin authored
RTL8168G also can disable/enable pll function. Signed-off-by:
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Chun-Hao Lin authored
Signed-off-by:
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David L Stevens authored
One of the error cases for vnet_start_xmit()'s "out_dropped" label is port == NULL, so only mess with port->clean_timer when port is not NULL. Signed-off-by:
David L Stevens <david.stevens@oracle.com> Signed-off-by:
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Thierry Reding authored
The dsa_switch_suspend() and dsa_switch_resume() functions are only used when PM_SLEEP is enabled, so they need #ifdef CONFIG_PM_SLEEP protection to avoid a compiler warning. Signed-off-by:
Thierry Reding <treding@nvidia.com> Acked-by:
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Subbaraya Sundeep Bhatta authored
Calling ether_setup is redundant since alloc_etherdev calls it. Signed-off-by:
Subbaraya Sundeep Bhatta <sbhatta@xilinx.com> Signed-off-by:
Michal Simek <michal.simek@xilinx.com> Signed-off-by:
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Eric Dumazet authored
Proper CHECKSUM_COMPLETE support needs to adjust skb->csum when we remove one header. Its done using skb_gro_postpull_rcsum() In the case of IPv4, we know that the adjustment is not really needed, because the checksum over IPv4 header is 0. Lets add a comment to ease code comprehension and avoid copy/paste errors. Signed-off-by:
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Stephen Rothwell authored
Signed-off-by:
Stephen Rothwell <sfr@canb.auug.org.au> Acked-by:
Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by:
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Fabian Frederick authored
Commit 3243acd3 ("ieee802154: add __init to lowpan_frags_sysctl_register") added __init to lowpan_frags_ns_sysctl_register instead of lowpan_frags_sysctl_register Suggested-by:
Alexander Aring <alex.aring@gmail.com> Signed-off-by:
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- 30 Sep, 2014 1 commit
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David S. Miller authored
David L Stevens says: ==================== sunvnet: add jumbo frames support This patch set updates the sunvnet driver to version 1.6 of the VIO protocol to support per-port exchange of MTU information and allow non-standard MTU sizes, including jumbo frames. Using large MTUs shows a nearly 5X throughput improvement Linux-Solaris and > 10X throughput improvement Linux-Linux. Changes from v8: -add a short timeout to free pending skbs if a new transmit doesn't do it first per Dave Miller <davem@davemloft.net> Changes from v7: -handle skb allocation failures in vnet_skb_shape() per Dave Miller <davem@davemloft.net> Changes from v6: -made kernel transmit path zero-copy to remove memory n^2 scaling issue raised by Raghuram Kothakota <Raghuram.Kothakota@oracle.com> Changes from v5: - fixed comment per Sowmini Varadhan <sowmini.varadhan@oracle.com> Changes from v4: - changed VNET_MAXPACKET per David Laight <David.Laight@ACULAB.COM> - added cookies to support non-contiguous buffers of max size Changes from v3: - added version functions per Dave Miller <davem@davemloft.net> - moved rmtu to vnet_port per Dave Miller <davem@davemloft.net> - explicitly set options bits and capability flags to 0 per Raghuram Kothakota <Raghuram.Kothakota@oracle.com> Changes from v2: - make checkpatch clean Changes from v1: - fix brace formatting per Dave Miller <davem@davemloft.net> ==================== Signed-off-by:
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