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net: enetc: add multiple command BD rings support

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All the tables of NETC switch are managed through the command BD ring,
but unlike ENETC, the switch has two command BD rings, if the current
ring is busy, the switch driver can switch to another ring to manage
the table. Currently, the NTMP driver does not support multiple rings.
Therefore, update ntmp_select_and_lock_cbdr() to select a appropriate
ring to execute the command for the switch.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Link: https://patch.msgid.link/20260518082506.1318236-9-wei.fang@nxp.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Wei Fang
2026-05-18 16:24:59 +08:00
committed by Paolo Abeni
parent 123db6a275
commit c5aed83ddc
1 changed files with 9 additions and 4 deletions
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13
drivers/net/ethernet/freescale/enetc/ntmp.c
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@@ -146,11 +146,16 @@ static void ntmp_clean_cbdr(struct netc_cbdr *cbdr)
static void ntmp_select_and_lock_cbdr(struct ntmp_user *user,
struct netc_cbdr **cbdr)
{
/* Currently only ENETC is supported, and it has only one command
* BD ring.
*/
*cbdr = &user->ring[0];
for (int i = 0; i < user->cbdr_num; i++) {
*cbdr = &user->ring[i];
if (mutex_trylock(&(*cbdr)->ring_lock))
return;
}
/* If all command BD rings are locked, we need to select one of
* them and wait for it.
*/
*cbdr = &user->ring[raw_smp_processor_id() % user->cbdr_num];
mutex_lock(&(*cbdr)->ring_lock);
}