diff options
| author | Julian Wiedmann <jwi@linux.ibm.com> | 2019-11-14 11:19:15 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-11-14 18:16:50 -0800 |
| commit | 5fd3fcbb8af8f9bc82afd84937393c193b95c204 (patch) | |
| tree | d86689584d7d385cf01565441d21e766faa07fc0 /drivers/s390/net/qeth_core_mpc.h | |
| parent | 845ef9047b1f4e8ea3b8865140066b08fe93d05c (diff) | |
| download | lwn-5fd3fcbb8af8f9bc82afd84937393c193b95c204.tar.gz lwn-5fd3fcbb8af8f9bc82afd84937393c193b95c204.zip | |
s390/qeth: support per-frame invalidation
Each RX buffer may contain up to 64KB worth of data. In case the device
needs to discard a packet _after_ already having reserved space for it
in the buffer, the whole buffer gets set to ERROR state. As the buffer
might contain any number of good packets, this can result in collateral
packet loss.
qeth can provide relief by enabling per-frame invalidation. The RX
buffer is then presented as usual, we just need to spot & drop any
individual packet that was flagged as invalid.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/s390/net/qeth_core_mpc.h')
| -rw-r--r-- | drivers/s390/net/qeth_core_mpc.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/s390/net/qeth_core_mpc.h b/drivers/s390/net/qeth_core_mpc.h index 9ad0d6f9d48b..53fcf6641154 100644 --- a/drivers/s390/net/qeth_core_mpc.h +++ b/drivers/s390/net/qeth_core_mpc.h @@ -900,6 +900,7 @@ extern unsigned char IDX_ACTIVATE_WRITE[]; #define IDX_ACTIVATE_SIZE 0x22 #define QETH_IDX_ACT_PNO(buffer) (buffer+0x0b) #define QETH_IDX_ACT_ISSUER_RM_TOKEN(buffer) (buffer + 0x0c) +#define QETH_IDX_ACT_INVAL_FRAME 0x40 #define QETH_IDX_NO_PORTNAME_REQUIRED(buffer) ((buffer)[0x0b] & 0x80) #define QETH_IDX_ACT_FUNC_LEVEL(buffer) (buffer + 0x10) #define QETH_IDX_ACT_DATASET_NAME(buffer) (buffer + 0x16) |