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Date: Mon, 12 Sep 2016 10:47:11 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net,
hariprasad@...lsio.com, leedom@...lsio.com, nirranjan@...lsio.com,
indranil@...lsio.com
Subject: Re: [PATCH net-next 6/7] cxgb4: add support for deleting u32 filters
Mon, Sep 12, 2016 at 10:12:39AM CEST, rahul.lakkireddy@...lsio.com wrote:
>Add support for deleting an offloaded u32 filter from hardware. If a
>link is deleted, then all corresponding filters associated with the link
>are also deleted. Also enable hardware tc offload as a supported
>feature.
>
>Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
>Signed-off-by: Hariprasad Shenai <hariprasad@...lsio.com>
I don't understand why add and delete are 2 separate patches. I believe
it should go in one.
>---
> drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c | 5 +-
> drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c | 92 +++++++++++++++++++++++
> drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.h | 2 +
> 3 files changed, 98 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
>index 28396f5..087066a 100644
>--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
>+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
>@@ -3047,6 +3047,8 @@ int cxgb_setup_tc(struct net_device *dev, u32 handle, __be16 proto,
> case TC_CLSU32_NEW_KNODE:
> case TC_CLSU32_REPLACE_KNODE:
> return cxgb4_config_knode(dev, proto, tc->cls_u32);
>+ case TC_CLSU32_DELETE_KNODE:
>+ return cxgb4_delete_knode(dev, proto, tc->cls_u32);
> default:
> return -EOPNOTSUPP;
> }
>@@ -5155,7 +5157,8 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
> netdev->hw_features = NETIF_F_SG | TSO_FLAGS |
> NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
> NETIF_F_RXCSUM | NETIF_F_RXHASH |
>- NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
>+ NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX |
>+ NETIF_F_HW_TC;
> if (highdma)
> netdev->hw_features |= NETIF_F_HIGHDMA;
> netdev->features |= netdev->hw_features;
>diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c
>index 62c1695..31847e3 100644
>--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c
>+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c
>@@ -279,6 +279,98 @@ out:
> return ret;
> }
>
>+int cxgb4_delete_knode(struct net_device *dev, __be16 protocol,
>+ struct tc_cls_u32_offload *cls)
>+{
>+ struct adapter *adapter = netdev2adap(dev);
>+ struct cxgb4_tc_u32_table *t;
>+ struct cxgb4_link *link = NULL;
>+ struct filter_ctx ctx;
>+ u32 handle, uhtid;
>+ unsigned int filter_id;
>+ unsigned int max_tids;
>+ unsigned int i, j;
>+ int ret;
>+
>+ if (!can_tc_u32_offload(dev))
>+ return -EOPNOTSUPP;
>+
>+ /* Fetch the location to delete the filter. */
>+ filter_id = (cls->knode.handle & 0xFFFFF);
Again with the (). Looks like you have it all over the place.
>+
>+ if (filter_id > adapter->tids.nftids) {
>+ dev_err(adapter->pdev_dev,
>+ "Location %d out of range for deletion. Max: %d\n",
>+ filter_id, adapter->tids.nftids);
>+ return -ERANGE;
>+ }
>+
>+ t = adapter->tc_u32;
>+ handle = cls->knode.handle;
>+ uhtid = TC_U32_USERHTID(cls->knode.handle);
>+
>+ /* Ensure that uhtid is either root u32 (i.e. 0x800)
>+ * or a a valid linked bucket.
>+ */
>+ if (uhtid != 0x800 && uhtid >= t->size)
>+ return -EINVAL;
>+
>+ /* Delete the specified filter */
>+ if (uhtid != 0x800) {
>+ link = &t->table[uhtid - 1];
>+ if (!link->link_handle)
>+ return -EINVAL;
>+
>+ if (!test_bit(filter_id, link->tid_map))
>+ return -EINVAL;
>+ }
>+
>+ init_completion(&ctx.completion);
>+
>+ ret = cxgb4_del_filter(dev, filter_id, &ctx);
>+ if (ret)
>+ goto out;
>+
>+ /* Wait for reply */
>+ ret = wait_for_completion_timeout(&ctx.completion, 10 * HZ);
>+ if (!ret)
>+ return -ETIMEDOUT;
Hmm, I think it would be nicer to have the completion dance wrapped
inside cxgb4_del_filter and have __cxgb4_del_filter for case you don't
need it.
>+
>+ ret = ctx.result;
>+ if (!ret && link)
>+ clear_bit(filter_id, link->tid_map);
>+
>+ /* If a link is being deleted, then delete all filters
>+ * associated with the link.
>+ */
>+ max_tids = adapter->tids.nftids;
>+ for (i = 0; i < t->size; i++) {
>+ link = &t->table[i];
>+
>+ if (link->link_handle == handle) {
>+ for (j = 0; j < max_tids; j++) {
>+ if (!test_bit(j, link->tid_map))
>+ continue;
>+
>+ ret = cxgb4_del_filter(dev, j, NULL);
>+ if (ret)
>+ goto out;
>+
>+ clear_bit(j, link->tid_map);
>+ }
>+
>+ /* Clear the link state */
>+ link->match_field = NULL;
>+ link->link_handle = 0;
>+ memset(&link->fs, 0, sizeof(link->fs));
>+ break;
>+ }
>+ }
>+
>+out:
>+ return ret;
>+}
>+
> void cxgb4_cleanup_tc_u32(struct adapter *adap)
> {
> struct cxgb4_tc_u32_table *t;
>diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.h b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.h
>index 46575843..6bdc885 100644
>--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.h
>+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.h
>@@ -48,6 +48,8 @@ static inline bool can_tc_u32_offload(struct net_device *dev)
>
> int cxgb4_config_knode(struct net_device *dev, __be16 protocol,
> struct tc_cls_u32_offload *cls);
>+int cxgb4_delete_knode(struct net_device *dev, __be16 protocol,
>+ struct tc_cls_u32_offload *cls);
>
> void cxgb4_cleanup_tc_u32(struct adapter *adapter);
> struct cxgb4_tc_u32_table *cxgb4_init_tc_u32(struct adapter *adap,
>--
>2.5.3
>
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