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Allow communication between functions on the same host when using the

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mlx4en(4) driver in SRIOV mode.

Place a copy of the destination MAC address in the send WQE only under
SRIOV/eSwitch configuration or when the device is in selftest. This
allows communication between functions on the same host.

PR:			216493
MFC after:		3 days
Sponsored by:		Mellanox Technologies
This commit is contained in:
hselasky 2017-06-01 10:44:48 +00:00
parent ccb7ba3598
commit be859e92be
1 changed files with 12 additions and 30 deletions
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42
sys/dev/mlx4/mlx4_en/mlx4_en_tx.c
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@ -661,18 +661,6 @@ static void mlx4_bf_copy(void __iomem *dst, volatile unsigned long *src, unsigne
__iowrite64_copy(dst, __DEVOLATILE(void *, src), bytecnt / 8);
}
static u64 mlx4_en_mac_to_u64(u8 *addr)
{
u64 mac = 0;
int i;
for (i = 0; i < ETHER_ADDR_LEN; i++) {
mac <<= 8;
mac |= addr[i];
}
return mac;
}
static int mlx4_en_xmit(struct mlx4_en_priv *priv, int tx_ind, struct mbuf **mbp)
{
enum {
@ -770,8 +758,18 @@ static int mlx4_en_xmit(struct mlx4_en_priv *priv, int tx_ind, struct mbuf **mbp
tx_desc->ctrl.ins_vlan = 0;
}
/* clear immediate field */
tx_desc->ctrl.imm = 0;
if (unlikely(mlx4_is_mfunc(priv->mdev->dev) || priv->validate_loopback)) {
/*
* Copy destination MAC address to WQE. This allows
* loopback in eSwitch, so that VFs and PF can
* communicate with each other:
*/
m_copydata(mb, 0, 2, __DEVOLATILE(void *, &tx_desc->ctrl.srcrb_flags16[0]));
m_copydata(mb, 2, 4, __DEVOLATILE(void *, &tx_desc->ctrl.imm));
} else {
/* clear immediate field */
tx_desc->ctrl.imm = 0;
}
/* Handle LSO (TSO) packets */
if (mb->m_pkthdr.csum_flags & CSUM_TSO) {
@ -930,22 +928,6 @@ static int mlx4_en_xmit(struct mlx4_en_priv *priv, int tx_ind, struct mbuf **mbp
else
mlx4_en_store_inline_header(dseg_inline, ihs, owner_bit);
if (unlikely(priv->validate_loopback)) {
/* Copy dst mac address to wqe */
struct ether_header *ethh;
u64 mac;
u32 mac_l, mac_h;
ethh = mtod(mb, struct ether_header *);
mac = mlx4_en_mac_to_u64(ethh->ether_dhost);
if (mac) {
mac_h = (u32) ((mac & 0xffff00000000ULL) >> 16);
mac_l = (u32) (mac & 0xffffffff);
tx_desc->ctrl.srcrb_flags |= cpu_to_be32(mac_h);
tx_desc->ctrl.imm = cpu_to_be32(mac_l);
}
}
/* update producer counter */
ring->prod += tx_info->nr_txbb;