diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/809-jailhouse-0018-ivshmem-net-Refactor-and-comment-ivshm_net_state_cha.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/809-jailhouse-0018-ivshmem-net-Refactor-and-comment-ivshm_net_state_cha.patch | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/809-jailhouse-0018-ivshmem-net-Refactor-and-comment-ivshm_net_state_cha.patch b/target/linux/layerscape/patches-5.4/809-jailhouse-0018-ivshmem-net-Refactor-and-comment-ivshm_net_state_cha.patch new file mode 100644 index 0000000000..cb3ffcc323 --- /dev/null +++ b/target/linux/layerscape/patches-5.4/809-jailhouse-0018-ivshmem-net-Refactor-and-comment-ivshm_net_state_cha.patch @@ -0,0 +1,63 @@ +From 5192fa99f0d267eb7bd1c79e556430ea8911ae38 Mon Sep 17 00:00:00 2001 +From: Jan Kiszka <jan.kiszka@siemens.com> +Date: Sun, 4 Mar 2018 13:50:24 +0100 +Subject: [PATCH] ivshmem-net: Refactor and comment ivshm_net_state_change + +This should make the state transitioning logic clearer. Also avoid the +harmless but redundant netif_carrier_on/ivshm_net_run in RUN state. + +Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> +(cherry picked from commit 8539efe70fbdf4a0bea75a97c1628fbb38b6590b) +--- + drivers/net/ivshmem-net.c | 23 ++++++++++++++++++++--- + 1 file changed, 20 insertions(+), 3 deletions(-) + +--- a/drivers/net/ivshmem-net.c ++++ b/drivers/net/ivshmem-net.c +@@ -575,14 +575,21 @@ static void ivshm_net_state_change(struc + struct net_device *ndev = in->napi.dev; + u32 rstate = readl(&in->ivshm_regs->rstate); + +- + switch (in->lstate) { + case IVSHM_NET_STATE_RESET: ++ /* ++ * Wait for the remote to leave READY/RUN before transitioning ++ * to INIT. ++ */ + if (rstate < IVSHM_NET_STATE_READY) + ivshm_net_set_state(in, IVSHM_NET_STATE_INIT); + break; + + case IVSHM_NET_STATE_INIT: ++ /* ++ * Wait for the remote to leave RESET before performing the ++ * initialization and moving to READY. ++ */ + if (rstate > IVSHM_NET_STATE_RESET) { + ivshm_net_init_queues(ndev); + ivshm_net_set_state(in, IVSHM_NET_STATE_READY); +@@ -594,11 +601,21 @@ static void ivshm_net_state_change(struc + break; + + case IVSHM_NET_STATE_READY: +- case IVSHM_NET_STATE_RUN: ++ /* ++ * Link is up and we are running once the remote is in READY or ++ * RUN. ++ */ + if (rstate >= IVSHM_NET_STATE_READY) { + netif_carrier_on(ndev); + ivshm_net_run(ndev); +- } else if (rstate == IVSHM_NET_STATE_RESET) { ++ break; ++ } ++ /* fall through */ ++ case IVSHM_NET_STATE_RUN: ++ /* ++ * If the remote goes to RESET, we need to follow immediately. ++ */ ++ if (rstate == IVSHM_NET_STATE_RESET) { + netif_carrier_off(ndev); + ivshm_net_do_stop(ndev); + } |