From: Arnd Bergmann <arnd@arndb.de>
To: Chris Metcalf <cmetcalf@tilera.com>
Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH v2 6/6] tilegx network driver: initial support
Date: Mon, 30 Apr 2012 14:35:08 +0000 [thread overview]
Message-ID: <201204301435.08810.arnd@arndb.de> (raw)
In-Reply-To: <201204291859.q3TIxIWB007275@farm-0027.internal.tilera.com>
On Friday 06 April 2012, Chris Metcalf wrote:
> This change adds support for the tilegx network driver based on the
> GXIO IORPC support in the tilegx software stack, using the on-chip
> mPIPE packet processing engine.
>
> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
All my previous comments have been addressed. A few more details
that I noticed only now:
> +/* A mutex for "tile_net_devs_for_channel". */
> +static struct mutex tile_net_devs_for_channel_mutex;
static DEFINE_MUTEX()
> +/* The per-cpu info. */
> +static DEFINE_PER_CPU(struct tile_net_info, per_cpu_info);
> +
> +/* Access to "per_cpu_info". */
> +static struct tile_net_info *infos[NR_CPUS];
The arrays should not be needed. Using per_cpu() on the variable
in front of it does the same.
> +static int __init network_cpus_setup(char *str)
> +{
> + int rc = cpulist_parse_crop(str, &network_cpus_map);
> + if (rc != 0) {
> + pr_warning("network_cpus=%s: malformed cpu list\n",
> + str);
> + } else {
> +
> + /* Remove dedicated cpus. */
> + cpumask_and(&network_cpus_map, &network_cpus_map,
> + cpu_possible_mask);
> +
> +
> + if (cpumask_empty(&network_cpus_map)) {
> + pr_warning("Ignoring network_cpus='%s'.\n", str);
> + } else {
> + char buf[1024];
> + cpulist_scnprintf(buf, sizeof(buf), &network_cpus_map);
> + pr_info("Linux network CPUs: %s\n", buf);
> + network_cpus_used = true;
> + }
> + }
> +
> + return 0;
> +}
> +__setup("network_cpus=", network_cpus_setup);
In device drivers, use module_param() instead of __setup() so that you can
set the arguments on the kernel command line and using modprobe with the
same syntax.
> +/* This function takes "skb", consisting of a header template and a
> + * (presumably) huge payload, and egresses it as one or more segments
> + * (aka packets), each consisting of a (possibly modified) copy of the
> + * header plus a piece of the payload, via "tcp segmentation offload".
> + *
> + * Usually, "data" will contain the header template, of size "sh_len",
> + * and "sh->frags" will contain "skb->data_len" bytes of payload, and
> + * there will be "sh->gso_segs" segments.
> + *
> + * Sometimes, if "sendfile()" requires copying, we will be called with
> + * "data" containing the header and payload, with "frags" being empty.
> + *
> + * Sometimes, for example when using NFS over TCP, a single segment can
> + * span 3 fragments. This requires special care below.
> + *
> + * See "emulate_large_send_offload()" for some reference code, which
> + * does not handle checksumming.
> + */
> +static int tile_net_tx_tso(struct sk_buff *skb, struct net_device *dev)
> +{
This function seems too long to be readable. I would suggest splitting
out some of the loop bodies in it into separate functions.
Arnd
next prev parent reply other threads:[~2012-04-30 14:35 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-04 20:39 [PATCH 0/6] arch/tile: provide tilegx networking support Chris Metcalf
2012-04-04 20:39 ` [PATCH 1/6] arch/tile: introduce GXIO IORPC framework for tilegx Chris Metcalf
2012-04-04 20:58 ` [PATCH 4/6] arch/tile: common DMA code for the GXIO IORPC subsystem Chris Metcalf
2012-04-06 17:41 ` [PATCH 2/6] arch/tile: fix set_pte() to properly handle kernel MMIO mappings Chris Metcalf
2012-04-06 17:52 ` [PATCH 3/6] arch/tile: support MMIO-based readb/writeb etc Chris Metcalf
2012-04-09 13:24 ` Arnd Bergmann
2012-04-09 20:53 ` Chris Metcalf
2012-04-06 20:38 ` [PATCH 5/6] arch/tile: provide kernel support for the tilegx mPIPE shim Chris Metcalf
2012-04-09 13:34 ` Arnd Bergmann
2012-04-09 21:04 ` Chris Metcalf
2012-04-06 20:42 ` [PATCH 6/6] tilegx network driver: initial support Chris Metcalf
2012-04-09 13:49 ` Arnd Bergmann
2012-04-09 21:30 ` Chris Metcalf
2012-04-10 10:42 ` Arnd Bergmann
2012-04-12 23:23 ` Chris Metcalf
2012-04-13 10:34 ` Arnd Bergmann
2012-04-28 22:07 ` Chris Metcalf
2012-04-04 20:39 ` [PATCH v2 0/6] arch/tile: networking support for tilegx Chris Metcalf
2012-04-04 20:39 ` [PATCH v2 1/6] arch/tile: introduce GXIO IORPC framework " Chris Metcalf
2012-04-04 20:58 ` [PATCH v2 3/6] arch/tile: common DMA code for the GXIO IORPC subsystem Chris Metcalf
2012-04-06 17:52 ` [PATCH v2 2/6] arch/tile: support MMIO-based readb/writeb etc Chris Metcalf
2012-04-06 20:38 ` [PATCH v2 4/6] arch/tile: provide kernel support for the tilegx mPIPE shim Chris Metcalf
2012-04-06 20:42 ` [PATCH v2 6/6] tilegx network driver: initial support Chris Metcalf
2012-04-30 14:35 ` Arnd Bergmann [this message]
2001-09-17 4:00 ` [PATCH v3] " Chris Metcalf
2012-05-03 5:41 ` David Miller
2012-05-03 15:45 ` Chris Metcalf
2012-05-03 17:07 ` David Miller
2012-05-03 17:25 ` Chris Metcalf
2012-05-03 16:41 ` [PATCH v4] " Chris Metcalf
2012-05-04 6:42 ` David Miller
2012-05-09 10:42 ` [PATCH v5] " Chris Metcalf
2012-05-11 13:54 ` Ben Hutchings
2012-05-20 4:42 ` [PATCH v6] " Chris Metcalf
2012-05-20 20:55 ` David Miller
2012-05-23 20:42 ` [PATCH v7] " Chris Metcalf
2012-05-24 4:31 ` David Miller
2012-05-25 14:42 ` [PATCH v8] " Chris Metcalf
2012-06-04 20:12 ` [PATCH v9] " Chris Metcalf
2012-06-06 16:41 ` David Miller
2012-06-06 17:31 ` Eric Dumazet
2012-06-06 17:40 ` Eric Dumazet
2012-06-06 18:36 ` Chris Metcalf
2012-06-06 18:54 ` David Miller
2001-09-17 4:00 ` [PATCH v10] " Chris Metcalf
2012-04-06 20:42 ` Chris Metcalf
2012-06-07 20:39 ` David Miller
2012-06-07 20:44 ` Chris Metcalf
2012-06-07 20:47 ` Chris Metcalf
2012-06-07 20:50 ` Ben Hutchings
2012-06-07 20:52 ` Joe Perches
2012-06-07 20:45 ` Chris Metcalf
2012-06-12 0:03 ` David Miller
2012-06-12 13:14 ` Chris Metcalf
2012-06-06 18:10 ` [PATCH v9] " Eric Dumazet
2012-06-06 18:17 ` David Miller
2012-06-06 18:19 ` Ben Hutchings
2012-05-20 16:35 ` [PATCH v5] " Chris Metcalf
2012-04-28 19:41 ` [PATCH v2 5/6] arch/tile: break out the "csum a long" function to <asm/checksum.h> Chris Metcalf
2012-04-29 11:15 ` [PATCH 6/6] tilegx network driver: initial support Arnd Bergmann
2012-04-15 23:06 ` Chris Metcalf
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