diff options
| author | Julian Wiedmann <jwi@linux.ibm.com> | 2020-05-06 11:09:46 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-05-07 00:11:26 +0300 |
| commit | a875fd1620ffb65f4e0d488f7fe1fba62cf9fedd (patch) | |
| tree | 7200ae122329d79fe140d0321765613955379583 /drivers/s390 | |
| parent | fff1aceb880f509fa02341acf0adca905513f139 (diff) | |
| download | linux-a875fd1620ffb65f4e0d488f7fe1fba62cf9fedd.tar.xz | |
s390/qeth: indicate contiguous TX buffer elements
The TX path usually maps the full content of a page into a buffer
element. But there's specific skb layouts (ie. linearized TSO skbs)
where the HW header (1) requires a separate buffer element, and (2) is
page-contiguous with the packet data that's mapped into the next buffer
element.
Flag such buffer elements accordingly, so that HW can optimize its data
access for them.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/net/qeth_core_main.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index 9c9a6edb5384..4d1d053eebb7 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -4110,8 +4110,16 @@ static unsigned int qeth_fill_buffer(struct qeth_qdio_out_buffer *buf, buffer->element[element].addr = virt_to_phys(hdr); buffer->element[element].length = hd_len; buffer->element[element].eflags = SBAL_EFLAGS_FIRST_FRAG; - /* remember to free cache-allocated HW header: */ - buf->is_header[element] = ((void *)hdr != skb->data); + + /* HW header is allocated from cache: */ + if ((void *)hdr != skb->data) + buf->is_header[element] = 1; + /* HW header was pushed and is contiguous with linear part: */ + else if (length > 0 && !PAGE_ALIGNED(data) && + (data == (char *)hdr + hd_len)) + buffer->element[element].eflags |= + SBAL_EFLAGS_CONTIGUOUS; + element++; } |