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platform/mellanox: mlxbf-tmfifo: Drop jumbo frames

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[ Upstream commit fc4c655821546239abb3cf4274d66b9747aa87dd ]

This commit drops over-sized network packets to avoid tmfifo
queue stuck.

Fixes: 1357dfd726 ("platform/mellanox: Add TmFifo driver for Mellanox BlueField Soc")
Signed-off-by: Liming Sun <limings@nvidia.com>
Reviewed-by: Vadim Pasternak <vadimp@nvidia.com>
Reviewed-by: David Thompson <davthompson@nvidia.com>
Link: https://lore.kernel.org/r/9318936c2447f76db475c985ca6d91f057efcd41.1693322547.git.limings@nvidia.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Liming Sun 2023-08-29 13:43:00 -04:00 committed by Greg Kroah-Hartman
parent 687031788f
commit 03be4412d3
1 changed files with 17 additions and 7 deletions
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24
drivers/platform/mellanox/mlxbf-tmfifo.c
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@ -205,7 +205,7 @@ static u8 mlxbf_tmfifo_net_default_mac[ETH_ALEN] = {
static efi_char16_t mlxbf_tmfifo_efi_name[] = L"RshimMacAddr";
/* Maximum L2 header length. */
#define MLXBF_TMFIFO_NET_L2_OVERHEAD 36
#define MLXBF_TMFIFO_NET_L2_OVERHEAD (ETH_HLEN + VLAN_HLEN)
/* Supported virtio-net features. */
#define MLXBF_TMFIFO_NET_FEATURES \
@ -623,13 +623,14 @@ static void mlxbf_tmfifo_rxtx_word(struct mlxbf_tmfifo_vring *vring,
* flag is set.
*/
static void mlxbf_tmfifo_rxtx_header(struct mlxbf_tmfifo_vring *vring,
struct vring_desc *desc,
struct vring_desc **desc,
bool is_rx, bool *vring_change)
{
struct mlxbf_tmfifo *fifo = vring->fifo;
struct virtio_net_config *config;
struct mlxbf_tmfifo_msg_hdr hdr;
int vdev_id, hdr_len;
bool drop_rx = false;
/* Read/Write packet header. */
if (is_rx) {
@ -649,8 +650,8 @@ static void mlxbf_tmfifo_rxtx_header(struct mlxbf_tmfifo_vring *vring,
if (ntohs(hdr.len) >
__virtio16_to_cpu(virtio_legacy_is_little_endian(),
config->mtu) +
MLXBF_TMFIFO_NET_L2_OVERHEAD)
return;
MLXBF_TMFIFO_NET_L2_OVERHEAD)
drop_rx = true;
} else {
vdev_id = VIRTIO_ID_CONSOLE;
hdr_len = 0;
@ -665,16 +666,25 @@ static void mlxbf_tmfifo_rxtx_header(struct mlxbf_tmfifo_vring *vring,
if (!tm_dev2)
return;
vring->desc = desc;
vring->desc = *desc;
vring = &tm_dev2->vrings[MLXBF_TMFIFO_VRING_RX];
*vring_change = true;
}
if (drop_rx && !IS_VRING_DROP(vring)) {
if (vring->desc_head)
mlxbf_tmfifo_release_pkt(vring);
*desc = &vring->drop_desc;
vring->desc_head = *desc;
vring->desc = *desc;
}
vring->pkt_len = ntohs(hdr.len) + hdr_len;
} else {
/* Network virtio has an extra header. */
hdr_len = (vring->vdev_id == VIRTIO_ID_NET) ?
sizeof(struct virtio_net_hdr) : 0;
vring->pkt_len = mlxbf_tmfifo_get_pkt_len(vring, desc);
vring->pkt_len = mlxbf_tmfifo_get_pkt_len(vring, *desc);
hdr.type = (vring->vdev_id == VIRTIO_ID_NET) ?
VIRTIO_ID_NET : VIRTIO_ID_CONSOLE;
hdr.len = htons(vring->pkt_len - hdr_len);
@ -723,7 +733,7 @@ static bool mlxbf_tmfifo_rxtx_one_desc(struct mlxbf_tmfifo_vring *vring,
/* Beginning of a packet. Start to Rx/Tx packet header. */
if (vring->pkt_len == 0) {
mlxbf_tmfifo_rxtx_header(vring, desc, is_rx, &vring_change);
mlxbf_tmfifo_rxtx_header(vring, &desc, is_rx, &vring_change);
(*avail)--;
/* Return if new packet is for another ring. */