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Date: Fri, 21 Feb 2014 12:22:48 +0000
From: Andrew Bennieston <andrew.bennieston@...rix.com>
To: Paul Durrant <Paul.Durrant@...rix.com>,
"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
CC: Ian Campbell <Ian.Campbell@...rix.com>,
Wei Liu <wei.liu2@...rix.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
David Vrabel <david.vrabel@...rix.com>
Subject: Re: [PATCH V4 net-next 1/5] xen-netback: Factor queue-specific data
into queue struct.
On 21/02/14 12:08, Paul Durrant wrote:
>> -----Original Message-----
>> From: Andrew J. Bennieston [mailto:andrew.bennieston@...rix.com]
>> Sent: 17 February 2014 17:58
>> To: xen-devel@...ts.xenproject.org
>> Cc: Ian Campbell; Wei Liu; Paul Durrant; netdev@...r.kernel.org; David
>> Vrabel; Andrew Bennieston
>> Subject: [PATCH V4 net-next 1/5] xen-netback: Factor queue-specific data
>> into queue struct.
>>
>> From: "Andrew J. Bennieston" <andrew.bennieston@...rix.com>
>>
>> In preparation for multi-queue support in xen-netback, move the
>> queue-specific data from struct xenvif into struct xenvif_queue, and
>> update the rest of the code to use this.
>>
>> Also adds loops over queues where appropriate, even though only one is
>> configured at this point, and uses alloc_netdev_mq() and the
>> corresponding multi-queue netif wake/start/stop functions in preparation
>> for multiple active queues.
>>
>> Finally, implements a trivial queue selection function suitable for
>> ndo_select_queue, which simply returns 0 for a single queue and uses
>> skb_get_hash() to compute the queue index otherwise.
>>
>> Signed-off-by: Andrew J. Bennieston <andrew.bennieston@...rix.com>
>> ---
>> drivers/net/xen-netback/common.h | 81 ++++--
>> drivers/net/xen-netback/interface.c | 314 ++++++++++++++-------
>> drivers/net/xen-netback/netback.c | 528 ++++++++++++++++++------------
>> -----
>> drivers/net/xen-netback/xenbus.c | 87 ++++--
>> 4 files changed, 593 insertions(+), 417 deletions(-)
>>
>> diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-
>> netback/common.h
>> index ae413a2..2550867 100644
>> --- a/drivers/net/xen-netback/common.h
>> +++ b/drivers/net/xen-netback/common.h
>> @@ -108,17 +108,36 @@ struct xenvif_rx_meta {
>> */
>> #define MAX_GRANT_COPY_OPS (MAX_SKB_FRAGS *
>> XEN_NETIF_RX_RING_SIZE)
>>
>> -struct xenvif {
>> - /* Unique identifier for this interface. */
>> - domid_t domid;
>> - unsigned int handle;
>> +/* Queue name is interface name with "-qNNN" appended */
>> +#define QUEUE_NAME_SIZE (IFNAMSIZ + 6)
>> +
>
> '-qNNN' is only 5 chars. Are you accounting for a NUL terminator too?
Almost certainly...
>
>> +/* IRQ name is queue name with "-tx" or "-rx" appended */
>> +#define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 4)
>> +
>
> If yes, then you appear to have doubly accounted for it here.
... yup, looks that way. I'll fix this.
>
>> +struct xenvif;
>> +
>> +struct xenvif_stats {
>> + /* Stats fields to be updated per-queue.
>> + * A subset of struct net_device_stats that contains only the
>> + * fields that are updated in netback.c for each queue.
>> + */
>> + unsigned int rx_bytes;
>> + unsigned int rx_packets;
>> + unsigned int tx_bytes;
>> + unsigned int tx_packets;
>> +};
>> +
>> +struct xenvif_queue { /* Per-queue data for xenvif */
>> + unsigned int id; /* Queue ID, 0-based */
>> + char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */
>> + struct xenvif *vif; /* Parent VIF */
>>
>> /* Use NAPI for guest TX */
>> struct napi_struct napi;
>> /* When feature-split-event-channels = 0, tx_irq = rx_irq. */
>> unsigned int tx_irq;
>> /* Only used when feature-split-event-channels = 1 */
>> - char tx_irq_name[IFNAMSIZ+4]; /* DEVNAME-tx */
>> + char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */
>> struct xen_netif_tx_back_ring tx;
>> struct sk_buff_head tx_queue;
>> struct page *mmap_pages[MAX_PENDING_REQS];
>> @@ -140,19 +159,34 @@ struct xenvif {
>> /* When feature-split-event-channels = 0, tx_irq = rx_irq. */
>> unsigned int rx_irq;
>> /* Only used when feature-split-event-channels = 1 */
>> - char rx_irq_name[IFNAMSIZ+4]; /* DEVNAME-rx */
>> + char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */
>> struct xen_netif_rx_back_ring rx;
>> struct sk_buff_head rx_queue;
>> RING_IDX rx_last_skb_slots;
>>
>> - /* This array is allocated seperately as it is large */
>> - struct gnttab_copy *grant_copy_op;
>> + struct gnttab_copy grant_copy_op[MAX_GRANT_COPY_OPS];
>>
>> /* We create one meta structure per ring request we consume, so
>> * the maximum number is the same as the ring size.
>> */
>> struct xenvif_rx_meta meta[XEN_NETIF_RX_RING_SIZE];
>>
>> + /* Transmit shaping: allow 'credit_bytes' every 'credit_usec'. */
>> + unsigned long credit_bytes;
>> + unsigned long credit_usec;
>> + unsigned long remaining_credit;
>> + struct timer_list credit_timeout;
>> + u64 credit_window_start;
>> +
>> + /* Statistics */
>> + struct xenvif_stats stats;
>> +};
>> +
>> +struct xenvif {
>> + /* Unique identifier for this interface. */
>> + domid_t domid;
>> + unsigned int handle;
>> +
>> u8 fe_dev_addr[6];
>>
>> /* Frontend feature information. */
>> @@ -166,15 +200,12 @@ struct xenvif {
>> /* Internal feature information. */
>> u8 can_queue:1; /* can queue packets for receiver? */
>>
>> - /* Transmit shaping: allow 'credit_bytes' every 'credit_usec'. */
>> - unsigned long credit_bytes;
>> - unsigned long credit_usec;
>> - unsigned long remaining_credit;
>> - struct timer_list credit_timeout;
>> - u64 credit_window_start;
>> + /* Queues */
>> + unsigned int num_queues;
>> + struct xenvif_queue *queues;
>>
>> /* Statistics */
>> - unsigned long rx_gso_checksum_fixup;
>> + atomic_t rx_gso_checksum_fixup;
>
> Any reason why this is not in xenvif_stats? If it were there then it would not need to be atomic.
The expectation was that it wouldn't be used very often, so an atomic
op. here wouldn't hurt. I can move it to xenvif_stats if you'd prefer,
though. I think the use of an atomic pre-dated the xenvif_stats struct,
so maybe it makes sense to move it there now.
Andrew.
>
> Paul
>
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