From: Jakub Kicinski <jakub.kicinski@netronome.com>
To: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Cc: Ralf Baechle <ralf@linux-mips.org>,
Paul Burton <paul.burton@mips.com>,
James Hogan <jhogan@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org
Subject: Re: [PATCH v2 net-next 05/15] net: sgi: ioc3-eth: allocate space for desc rings only once
Date: Thu, 29 Aug 2019 14:05:37 -0700 [thread overview]
Message-ID: <20190829140537.68abfc9f@cakuba.netronome.com> (raw)
In-Reply-To: <20190829155014.9229-6-tbogendoerfer@suse.de>
On Thu, 29 Aug 2019 17:50:03 +0200, Thomas Bogendoerfer wrote:
> Memory for descriptor rings are allocated/freed, when interface is
> brought up/down. Since the size of the rings is not changeable by
> hardware, we now allocate rings now during probe and free it, when
> device is removed.
>
> Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
> ---
> drivers/net/ethernet/sgi/ioc3-eth.c | 103 ++++++++++++++++++------------------
> 1 file changed, 51 insertions(+), 52 deletions(-)
>
> diff --git a/drivers/net/ethernet/sgi/ioc3-eth.c b/drivers/net/ethernet/sgi/ioc3-eth.c
> index ba18a53fbbe6..d9d94a55ac34 100644
> --- a/drivers/net/ethernet/sgi/ioc3-eth.c
> +++ b/drivers/net/ethernet/sgi/ioc3-eth.c
> @@ -803,25 +803,17 @@ static void ioc3_free_rings(struct ioc3_private *ip)
> struct sk_buff *skb;
> int rx_entry, n_entry;
>
> - if (ip->txr) {
> - ioc3_clean_tx_ring(ip);
> - free_pages((unsigned long)ip->txr, 2);
> - ip->txr = NULL;
> - }
> + ioc3_clean_tx_ring(ip);
>
> - if (ip->rxr) {
> - n_entry = ip->rx_ci;
> - rx_entry = ip->rx_pi;
> + n_entry = ip->rx_ci;
> + rx_entry = ip->rx_pi;
>
> - while (n_entry != rx_entry) {
> - skb = ip->rx_skbs[n_entry];
> - if (skb)
> - dev_kfree_skb_any(skb);
> + while (n_entry != rx_entry) {
> + skb = ip->rx_skbs[n_entry];
> + if (skb)
> + dev_kfree_skb_any(skb);
I think dev_kfree_skb_any() accepts NULL
>
> - n_entry = (n_entry + 1) & RX_RING_MASK;
> - }
> - free_page((unsigned long)ip->rxr);
> - ip->rxr = NULL;
> + n_entry = (n_entry + 1) & RX_RING_MASK;
> }
> }
>
> @@ -829,49 +821,34 @@ static void ioc3_alloc_rings(struct net_device *dev)
> {
> struct ioc3_private *ip = netdev_priv(dev);
> struct ioc3_erxbuf *rxb;
> - unsigned long *rxr;
> int i;
>
> - if (!ip->rxr) {
> - /* Allocate and initialize rx ring. 4kb = 512 entries */
> - ip->rxr = (unsigned long *)get_zeroed_page(GFP_ATOMIC);
> - rxr = ip->rxr;
> - if (!rxr)
> - pr_err("%s: get_zeroed_page() failed!\n", __func__);
> -
> - /* Now the rx buffers. The RX ring may be larger but
> - * we only allocate 16 buffers for now. Need to tune
> - * this for performance and memory later.
> - */
> - for (i = 0; i < RX_BUFFS; i++) {
> - struct sk_buff *skb;
> + /* Now the rx buffers. The RX ring may be larger but
> + * we only allocate 16 buffers for now. Need to tune
> + * this for performance and memory later.
> + */
> + for (i = 0; i < RX_BUFFS; i++) {
> + struct sk_buff *skb;
>
> - skb = ioc3_alloc_skb(RX_BUF_ALLOC_SIZE, GFP_ATOMIC);
> - if (!skb) {
> - show_free_areas(0, NULL);
> - continue;
> - }
> + skb = ioc3_alloc_skb(RX_BUF_ALLOC_SIZE, GFP_ATOMIC);
> + if (!skb) {
> + show_free_areas(0, NULL);
> + continue;
> + }
>
> - ip->rx_skbs[i] = skb;
> + ip->rx_skbs[i] = skb;
>
> - /* Because we reserve afterwards. */
> - skb_put(skb, (1664 + RX_OFFSET));
> - rxb = (struct ioc3_erxbuf *)skb->data;
> - rxr[i] = cpu_to_be64(ioc3_map(rxb, 1));
> - skb_reserve(skb, RX_OFFSET);
> - }
> - ip->rx_ci = 0;
> - ip->rx_pi = RX_BUFFS;
> + /* Because we reserve afterwards. */
> + skb_put(skb, (1664 + RX_OFFSET));
> + rxb = (struct ioc3_erxbuf *)skb->data;
> + ip->rxr[i] = cpu_to_be64(ioc3_map(rxb, 1));
> + skb_reserve(skb, RX_OFFSET);
> }
> + ip->rx_ci = 0;
> + ip->rx_pi = RX_BUFFS;
>
> - if (!ip->txr) {
> - /* Allocate and initialize tx rings. 16kb = 128 bufs. */
> - ip->txr = (struct ioc3_etxd *)__get_free_pages(GFP_KERNEL, 2);
> - if (!ip->txr)
> - pr_err("%s: __get_free_pages() failed!\n", __func__);
> - ip->tx_pi = 0;
> - ip->tx_ci = 0;
> - }
> + ip->tx_pi = 0;
> + ip->tx_ci = 0;
> }
>
> static void ioc3_init_rings(struct net_device *dev)
> @@ -1239,6 +1216,23 @@ static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> timer_setup(&ip->ioc3_timer, ioc3_timer, 0);
>
> ioc3_stop(ip);
> +
> + /* Allocate and rx ring. 4kb = 512 entries */
> + ip->rxr = (unsigned long *)get_zeroed_page(GFP_ATOMIC);
> + if (!ip->rxr) {
> + pr_err("ioc3-eth: rx ring allocation failed\n");
> + err = -ENOMEM;
> + goto out_stop;
> + }
> +
> + /* Allocate tx rings. 16kb = 128 bufs. */
> + ip->txr = (struct ioc3_etxd *)__get_free_pages(GFP_KERNEL, 2);
> + if (!ip->txr) {
> + pr_err("ioc3-eth: tx ring allocation failed\n");
> + err = -ENOMEM;
> + goto out_stop;
> + }
Please just use kcalloc()/kmalloc_array() here, and make sure the flags
are set to GFP_KERNEL whenever possible. Here and in ioc3_alloc_rings()
it looks like GFP_ATOMIC is unnecessary.
next prev parent reply other threads:[~2019-08-29 21:06 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-29 15:49 [PATCH v2 net-next 00/15] ioc3-eth improvements Thomas Bogendoerfer
2019-08-29 15:49 ` [PATCH v2 net-next 01/15] MIPS: SGI-IP27: remove ioc3 ethernet init Thomas Bogendoerfer
2019-08-29 15:50 ` [PATCH v2 net-next 02/15] MIPS: SGI-IP27: restructure ioc3 register access Thomas Bogendoerfer
2019-08-29 21:26 ` Shannon Nelson
2019-08-29 15:50 ` [PATCH v2 net-next 03/15] net: sgi: ioc3-eth: remove checkpatch errors/warning Thomas Bogendoerfer
2019-08-29 15:50 ` [PATCH v2 net-next 04/15] net: sgi: ioc3-eth: use defines for constants dealing with desc rings Thomas Bogendoerfer
2019-08-29 15:50 ` [PATCH v2 net-next 05/15] net: sgi: ioc3-eth: allocate space for desc rings only once Thomas Bogendoerfer
2019-08-29 21:05 ` Jakub Kicinski [this message]
2019-08-29 22:00 ` Thomas Bogendoerfer
2019-08-29 22:05 ` Jakub Kicinski
2019-08-30 8:09 ` Thomas Bogendoerfer
2019-08-29 15:50 ` [PATCH v2 net-next 06/15] net: sgi: ioc3-eth: get rid of ioc3_clean_rx_ring() Thomas Bogendoerfer
2019-08-29 15:50 ` [PATCH v2 net-next 07/15] net: sgi: ioc3-eth: separate tx and rx ring handling Thomas Bogendoerfer
2019-08-29 15:50 ` [PATCH v2 net-next 08/15] net: sgi: ioc3-eth: introduce chip start function Thomas Bogendoerfer
2019-08-29 15:50 ` [PATCH v2 net-next 09/15] net: sgi: ioc3-eth: split ring cleaning/freeing and allocation Thomas Bogendoerfer
2019-08-29 15:50 ` [PATCH v2 net-next 10/15] net: sgi: ioc3-eth: refactor rx buffer allocation Thomas Bogendoerfer
2019-08-29 15:50 ` [PATCH v2 net-next 11/15] net: sgi: ioc3-eth: use dma-direct for dma allocations Thomas Bogendoerfer
2019-08-29 15:50 ` [PATCH v2 net-next 12/15] net: sgi: ioc3-eth: use csum_fold Thomas Bogendoerfer
2019-08-29 15:50 ` [PATCH v2 net-next 13/15] net: sgi: ioc3-eth: Fix IPG settings Thomas Bogendoerfer
2019-08-29 15:50 ` [PATCH v2 net-next 14/15] net: sgi: ioc3-eth: protect emcr in all cases Thomas Bogendoerfer
2019-08-29 15:50 ` [PATCH v2 net-next 15/15] net: sgi: ioc3-eth: no need to stop queue set_multicast_list Thomas Bogendoerfer
2019-08-29 21:15 ` [PATCH v2 net-next 00/15] ioc3-eth improvements Jakub Kicinski
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190829140537.68abfc9f@cakuba.netronome.com \
--to=jakub.kicinski@netronome.com \
--cc=davem@davemloft.net \
--cc=jhogan@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=paul.burton@mips.com \
--cc=ralf@linux-mips.org \
--cc=tbogendoerfer@suse.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).