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net: dsa: bcm_sf2: Simplify bcm_sf2_cfp_rule_get_all() 

There is no need to do a HW search of the TCAMs which is something slow
and expensive. Since we already maintain a bitmask of active CFP rules,
just iterate over those, starting from bit 1 (after the reserved entry)
to get a count and index position to store the rule later on.

As a result we can remove the code in bcm_sf2_cfp_rule_get() which acted
on the "search" argument, and remove that argument.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2017-10-20 14:39:46 -07:00 committed by David S. Miller
parent 5d80bcbb63
commit 4daa70cfb6
1 changed files with 14 additions and 54 deletions
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68
drivers/net/dsa/bcm_sf2_cfp.c
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@ -491,28 +491,24 @@ static int bcm_sf2_cfp_ipv4_rule_get(struct bcm_sf2_priv *priv, int port,
}
static int bcm_sf2_cfp_rule_get(struct bcm_sf2_priv *priv, int port,
struct ethtool_rxnfc *nfc, bool search)
struct ethtool_rxnfc *nfc)
{
struct ethtool_tcpip4_spec *v4_spec = NULL, *v4_m_spec;
unsigned int queue_num;
u32 reg;
int ret;
if (!search) {
bcm_sf2_cfp_rule_addr_set(priv, nfc->fs.location);
bcm_sf2_cfp_rule_addr_set(priv, nfc->fs.location);
ret = bcm_sf2_cfp_op(priv, OP_SEL_READ | ACT_POL_RAM);
if (ret)
return ret;
ret = bcm_sf2_cfp_op(priv, OP_SEL_READ | ACT_POL_RAM);
if (ret)
return ret;
reg = core_readl(priv, CORE_ACT_POL_DATA0);
reg = core_readl(priv, CORE_ACT_POL_DATA0);
ret = bcm_sf2_cfp_op(priv, OP_SEL_READ | TCAM_SEL);
if (ret)
return ret;
} else {
reg = core_readl(priv, CORE_ACT_POL_DATA0);
}
ret = bcm_sf2_cfp_op(priv, OP_SEL_READ | TCAM_SEL);
if (ret)
return ret;
/* Extract the destination port */
nfc->fs.ring_cookie = fls((reg >> DST_MAP_IB_SHIFT) &
@ -541,9 +537,6 @@ static int bcm_sf2_cfp_rule_get(struct bcm_sf2_priv *priv, int port,
v4_m_spec = &nfc->fs.m_u.udp_ip4_spec;
break;
default:
/* Clear to exit the search process */
if (search)
core_readl(priv, CORE_CFP_DATA_PORT(7));
return -EINVAL;
}
@ -577,44 +570,11 @@ static int bcm_sf2_cfp_rule_get_all(struct bcm_sf2_priv *priv,
u32 *rule_locs)
{
unsigned int index = 1, rules_cnt = 0;
int ret;
u32 reg;
/* Do not poll on OP_STR_DONE to be self-clearing for search
* operations, we cannot use bcm_sf2_cfp_op here because it completes
* on clearing OP_STR_DONE which won't clear until the entire search
* operation is over.
*/
reg = core_readl(priv, CORE_CFP_ACC);
reg &= ~(XCESS_ADDR_MASK << XCESS_ADDR_SHIFT);
reg |= index << XCESS_ADDR_SHIFT;
reg &= ~(OP_SEL_MASK | RAM_SEL_MASK);
reg |= OP_SEL_SEARCH | TCAM_SEL | OP_STR_DONE;
core_writel(priv, reg, CORE_CFP_ACC);
do {
/* Wait for results to be ready */
reg = core_readl(priv, CORE_CFP_ACC);
/* Extract the address we are searching */
index = reg >> XCESS_ADDR_SHIFT;
index &= XCESS_ADDR_MASK;
/* We have a valid search result, so flag it accordingly */
if (reg & SEARCH_STS) {
ret = bcm_sf2_cfp_rule_get(priv, port, nfc, true);
if (ret)
continue;
rule_locs[rules_cnt] = index;
rules_cnt++;
}
/* Search is over break out */
if (!(reg & OP_STR_DONE))
break;
} while (index < priv->num_cfp_rules);
for_each_set_bit_from(index, priv->cfp.used, priv->num_cfp_rules) {
rule_locs[rules_cnt] = index;
rules_cnt++;
}
/* Put the TCAM size here */
nfc->data = bcm_sf2_cfp_rule_size(priv);
@ -640,7 +600,7 @@ int bcm_sf2_get_rxnfc(struct dsa_switch *ds, int port,
nfc->data |= RX_CLS_LOC_SPECIAL;
break;
case ETHTOOL_GRXCLSRULE:
ret = bcm_sf2_cfp_rule_get(priv, port, nfc, false);
ret = bcm_sf2_cfp_rule_get(priv, port, nfc);
break;
case ETHTOOL_GRXCLSRLALL:
ret = bcm_sf2_cfp_rule_get_all(priv, port, nfc, rule_locs);