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Date: Mon, 23 Aug 2010 10:41:11 -0500
From: Jon Mason <jon.mason@...r.com>
To: Cong Wang <amwang@...hat.com>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"bhutchings@...arflare.com" <bhutchings@...arflare.com>,
Ramkrishna Vepa <Ramkrishna.Vepa@...r.com>,
"sgruszka@...hat.com" <sgruszka@...hat.com>,
"davem@...emloft.net" <davem@...emloft.net>
Subject: Re: [Patch 1/2] s2io: remove lro parameter
On Mon, Aug 23, 2010 at 01:42:20AM -0700, Cong Wang wrote:
> On 08/20/10 16:54, Cong Wang wrote:
> > On 08/18/10 23:36, Jon Mason wrote:
> >> On Wed, Aug 18, 2010 at 12:51:09AM -0700, Amerigo Wang wrote:
> >>>
> >>> As suggested by David, this parameter can die, we can use ethtool
> >>> to turn LRO on/off. Compile tests only.
> >>
> >> Needs some additional removal
> >>
> >> Line 41 and 42 " * lro: Specifies whether to enable Large Receive ..."
> >> As you have removed the modparm
> >>
> >> Line 8286 "if (sp->lro)"
> >> As it will always be on in this instance
> >>
> >>
> >> Also, all references to "sp->lro" can be converted to "(dev->features
> >> & NETIF_F_LRO)", removing an unnecessary variable.
> >>
> >
> > Thanks for pointing these out.
> > I will fix them later.
> >
>
> Done, please review the patch below.
Looks good to me. Push it formally, and I'll ack it.
Thanks,
Jon
>
> Thanks!
>
> --
>
> Remove "lro" parameter of s2io driver.
>
> Signed-off-by: WANG Cong <amwang@...hat.com>
> diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
> index 18bc5b7..b3a30ac 100644
> --- a/drivers/net/s2io.c
> +++ b/drivers/net/s2io.c
> @@ -38,8 +38,6 @@
> * Tx descriptors that can be associated with each corresponding FIFO.
> * intr_type: This defines the type of interrupt. The values can be 0(INTA),
> * 2(MSI_X). Default value is '2(MSI_X)'
> - * lro: Specifies whether to enable Large Receive Offload (LRO) or not.
> - * Possible values '1' for enable '0' for disable. Default is '0'
> * lro_max_pkts: This parameter defines maximum number of packets can be
> * aggregated as a single large packet
> * napi: This parameter used to enable/disable NAPI (polling Rx)
> @@ -496,8 +494,6 @@ S2IO_PARM_INT(rxsync_frequency, 3);
> /* Interrupt type. Values can be 0(INTA), 2(MSI_X) */
> S2IO_PARM_INT(intr_type, 2);
> /* Large receive offload feature */
> -static unsigned int lro_enable = 1;
> -module_param_named(lro, lro_enable, uint, 0);
>
> /* Max pkts to be aggregated by LRO at one time. If not specified,
> * aggregation happens until we hit max IP pkt size(64K)
> @@ -6735,13 +6731,10 @@ static int s2io_ethtool_set_flags(struct net_device *dev, u32 data)
> return -EINVAL;
>
> if (data & ETH_FLAG_LRO) {
> - if (lro_enable) {
> - if (!(dev->features & NETIF_F_LRO)) {
> - dev->features |= NETIF_F_LRO;
> - changed = 1;
> - }
> - } else
> - rc = -EINVAL;
> + if (!(dev->features & NETIF_F_LRO)) {
> + dev->features |= NETIF_F_LRO;
> + changed = 1;
> + }
> } else if (dev->features & NETIF_F_LRO) {
> dev->features &= ~NETIF_F_LRO;
> changed = 1;
> @@ -6750,7 +6743,6 @@ static int s2io_ethtool_set_flags(struct net_device *dev, u32 data)
> if (changed && netif_running(dev)) {
> s2io_stop_all_tx_queue(sp);
> s2io_card_down(sp);
> - sp->lro = !!(dev->features & NETIF_F_LRO);
> rc = s2io_card_up(sp);
> if (rc)
> s2io_reset(sp);
> @@ -7307,7 +7299,7 @@ static int s2io_card_up(struct s2io_nic *sp)
> struct ring_info *ring = &mac_control->rings[i];
>
> ring->mtu = dev->mtu;
> - ring->lro = sp->lro;
> + ring->lro = !!(dev->features & NETIF_F_LRO);
> ret = fill_rx_buffers(sp, ring, 1);
> if (ret) {
> DBG_PRINT(ERR_DBG, "%s: Out of memory in Open\n",
> @@ -7341,7 +7333,7 @@ static int s2io_card_up(struct s2io_nic *sp)
> /* Setting its receive mode */
> s2io_set_multicast(dev);
>
> - if (sp->lro) {
> + if (dev->features & NETIF_F_LRO) {
> /* Initialize max aggregatable pkts per session based on MTU */
> sp->lro_max_aggr_per_sess = ((1<<16) - 1) / dev->mtu;
> /* Check if we can use (if specified) user provided value */
> @@ -7911,7 +7903,6 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
> else
> sp->device_type = XFRAME_I_DEVICE;
>
> - sp->lro = lro_enable;
>
> /* Initialize some PCI/PCI-X fields of the NIC. */
> s2io_init_pci(sp);
> @@ -8047,8 +8038,7 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
> dev->netdev_ops = &s2io_netdev_ops;
> SET_ETHTOOL_OPS(dev, &netdev_ethtool_ops);
> dev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
> - if (lro_enable)
> - dev->features |= NETIF_F_LRO;
> + dev->features |= NETIF_F_LRO;
> dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
> if (sp->high_dma_flag == true)
> dev->features |= NETIF_F_HIGHDMA;
> @@ -8283,9 +8273,8 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
> dev->name);
> }
>
> - if (sp->lro)
> - DBG_PRINT(ERR_DBG, "%s: Large receive offload enabled\n",
> - dev->name);
> + DBG_PRINT(ERR_DBG, "%s: Large receive offload enabled\n",
> + dev->name);
> if (ufo)
> DBG_PRINT(ERR_DBG,
> "%s: UDP Fragmentation Offload(UFO) enabled\n",
> diff --git a/drivers/net/s2io.h b/drivers/net/s2io.h
> index 0af0335..26c7884 100644
> --- a/drivers/net/s2io.h
> +++ b/drivers/net/s2io.h
> @@ -971,7 +971,6 @@ struct s2io_nic {
>
> unsigned long clubbed_frms_cnt;
> unsigned long sending_both;
> - u8 lro;
> u16 lro_max_aggr_per_sess;
> volatile unsigned long state;
> u64 general_int_mask;
--
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