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Date: Sat, 5 Dec 2020 14:54:56 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Geetha sowjanya <gakula@...vell.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
sgoutham@...vell.com, davem@...emloft.net, sbhatta@...vell.com
Subject: Re: [PATCH] octeontx2-pf: Add RSS multi group support
On Fri, 4 Dec 2020 14:54:51 +0530 Geetha sowjanya wrote:
> Hardware supports 8 RSS groups per interface. Currently we are using
> only group '0'. This patch allows user to create new RSS groups/contexts
> and use the same as destination for flow steering rules.
>
> usage:
> To steer the traffic to RQ 2,3
>
> ethtool -X eth0 weight 0 0 1 1 context new
> (It will print the allocated context id number)
> New RSS context is 1
>
> ethtool -N eth0 flow-type tcp4 dst-port 80 context 1 loc 1
>
> To delete the context
> ethtool -X eth0 context 1 delete
>
> When an RSS context is removed, the active classification
> rules using this context are also removed.
>
> Signed-off-by: Sunil Kovvuri Goutham <sgoutham@...vell.com>
> Signed-off-by: Geetha sowjanya <gakula@...vell.com>
Looks good, minor coding nits below.
> diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> index 73fb94d..0c84dcf 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> @@ -270,14 +270,17 @@ int otx2_set_flowkey_cfg(struct otx2_nic *pfvf)
> return err;
> }
>
> -int otx2_set_rss_table(struct otx2_nic *pfvf)
> +int otx2_set_rss_table(struct otx2_nic *pfvf, int ctx_id)
> {
> struct otx2_rss_info *rss = &pfvf->hw.rss_info;
> + int index = rss->rss_size * ctx_id;
const?
> struct mbox *mbox = &pfvf->mbox;
> + struct otx2_rss_ctx *rss_ctx;
> struct nix_aq_enq_req *aq;
> int idx, err;
>
> mutex_lock(&mbox->lock);
> + rss_ctx = rss->rss_ctx[ctx_id];
> /* Get memory to put this msg */
> for (idx = 0; idx < rss->rss_size; idx++) {
> aq = otx2_mbox_alloc_msg_nix_aq_enq(mbox);
> +/* RSS context configuration */
> +static int otx2_set_rxfh_context(struct net_device *dev, const u32 *indir,
> + const u8 *hkey, const u8 hfunc,
> + u32 *rss_context, bool delete)
> +{
> struct otx2_nic *pfvf = netdev_priv(dev);
> + struct otx2_rss_ctx *rss_ctx;
> + struct otx2_rss_info *rss;
> + int ret, idx;
> +
> + if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP)
> + return -EOPNOTSUPP;
> +
> + rss = &pfvf->hw.rss_info;
>
> - return pfvf->hw.rss_info.rss_size;
> + if (!rss->enable) {
> + netdev_err(dev, "RSS is disabled, cannot change settings\n");
> + return -EIO;
> + }
> +
> + if (hkey) {
> + memcpy(rss->key, hkey, sizeof(rss->key));
> + otx2_set_rss_key(pfvf);
> + }
> + if (delete)
> + return otx2_rss_ctx_delete(pfvf, *rss_context);
> +
> + if (*rss_context == ETH_RXFH_CONTEXT_ALLOC) {
> + ret = otx2_rss_ctx_create(pfvf, rss_context);
> + if (ret)
> + return ret;
> + }
> + if (indir) {
> + rss_ctx = rss->rss_ctx[*rss_context];
> + for (idx = 0; idx < rss->rss_size; idx++)
> + rss_ctx->ind_tbl[idx] = indir[idx];
> + }
> + otx2_set_rss_table(pfvf, *rss_context);
> +
> + return 0;
> +}
> +
> +static int otx2_get_rxfh_context(struct net_device *dev, u32 *indir,
> + u8 *hkey, u8 *hfunc, u32 rss_context)
> +{
> + struct otx2_nic *pfvf = netdev_priv(dev);
> + struct otx2_rss_ctx *rss_ctx;
> + struct otx2_rss_info *rss;
> + int idx;
> +
> + rss = &pfvf->hw.rss_info;
> +
> + if (!rss->enable) {
> + netdev_err(dev, "RSS is disabled\n");
> + return -EIO;
> + }
> + if (rss_context >= MAX_RSS_GROUPS)
> + return -EINVAL;
> +
> + rss_ctx = rss->rss_ctx[rss_context];
> + if (!rss_ctx)
> + return -EINVAL;
> +
> + if (indir) {
> + for (idx = 0; idx < rss->rss_size; idx++)
> + indir[idx] = rss_ctx->ind_tbl[idx];
> + }
> + if (hkey)
> + memcpy(hkey, rss->key, sizeof(rss->key));
> +
> + if (hfunc)
> + *hfunc = ETH_RSS_HASH_TOP;
> +
> + return 0;
> }
Can the old callbacks not be converted to something like:
static int otx2_get_rxfh(...)
{
return otx2_get_rxfh_context(..., DEFAULT_RSS_CONTEXT_GROUP);
}
?
> diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
> index be8ccfc..e5f6b4a 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
> @@ -17,6 +17,7 @@ struct otx2_flow {
> u16 entry;
> bool is_vf;
> int vf;
> + u8 rss_ctx_id;
If you put it next to the bool it will make the structure smaller (less
padding).
> };
>
> int otx2_alloc_mcam_entries(struct otx2_nic *pfvf)
> @@ -521,7 +523,6 @@ static int otx2_add_flow_msg(struct otx2_nic *pfvf, struct otx2_flow *flow)
> mutex_unlock(&pfvf->mbox.lock);
> return err;
> }
> -
Unrelated whitespace change.
> req->entry = flow->entry;
> req->intf = NIX_INTF_RX;
> req->set_cntr = 1;
> @@ -555,9 +560,10 @@ static int otx2_add_flow_msg(struct otx2_nic *pfvf, struct otx2_flow *flow)
> return err;
> }
>
> -int otx2_add_flow(struct otx2_nic *pfvf, struct ethtool_rx_flow_spec *fsp)
> +int otx2_add_flow(struct otx2_nic *pfvf, struct ethtool_rxnfc *nfc)
> {
> struct otx2_flow_config *flow_cfg = pfvf->flow_cfg;
> + struct ethtool_rx_flow_spec *fsp = &nfc->fs;
> u32 ring = ethtool_get_flow_spec_ring(fsp->ring_cookie);
Please keep variable decl lines sorted longest to shortest.
> struct otx2_flow *flow;
> bool new = false;
> @@ -643,10 +652,27 @@ int otx2_remove_flow(struct otx2_nic *pfvf, u32 location)
> list_del(&flow->list);
> kfree(flow);
> flow_cfg->nr_flows--;
> -
Unrelated whitespace change.
> return 0;
> }
>
> +void otx2_rss_ctx_flow_del(struct otx2_nic *pfvf, int ctx_id)
Double space after void
> +{
> + struct otx2_flow *flow, *tmp;
> + int err;
> +
> + list_for_each_entry_safe(flow, tmp, &pfvf->flow_cfg->flow_list, list) {
> + if (!flow)
> + return;
I don't think you can possibly have a NULL entry on a standard list.
> + if (flow->rss_ctx_id != ctx_id)
> + continue;
> + err = otx2_remove_flow(pfvf, flow->location);
> + if (err)
> + netdev_warn(pfvf->netdev,
> + "Can't delete the rule %d associated with this rss group",
> + flow->location);
Printing the error code could be useful : %d", ..., err);
> + }
> +}
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