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Code Issues Releases Activity

Prefer MSI-X to MSI on controllers that support MSI-X. All

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recent PCIe controllers(RTL8102E or later and RTL8168/8111C or
later) supports either 2 or 4 MSI-X messages. Unfortunately vendor
did not publicly release RSS related information yet. However
switching to MSI-X is one-step forward to support RSS.
This commit is contained in:
Pyun YongHyeon 2011-01-25 22:18:00 +00:00
parent cb38d4941c
commit 4a58fd452a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=217857
2 changed files with 54 additions and 11 deletions
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63
sys/dev/re/if_re.c
View File

@ -159,6 +159,8 @@ MODULE_DEPEND(re, miibus, 1, 1, 1);
/* Tunables. */
static int msi_disable = 0;
TUNABLE_INT("hw.re.msi_disable", &msi_disable);
static int msix_disable = 0;
TUNABLE_INT("hw.re.msix_disable", &msix_disable);
static int prefer_iomap = 0;
TUNABLE_INT("hw.re.prefer_iomap", &prefer_iomap);
@ -1176,7 +1178,7 @@ re_attach(device_t dev)
int hwrev;
u_int16_t devid, re_did = 0;
int error = 0, i, phy, rid;
int msic, reg;
int msic, msixc, reg;
uint8_t cfg;
sc = device_get_softc(dev);
@ -1226,18 +1228,51 @@ re_attach(device_t dev)
sc->rl_btag = rman_get_bustag(sc->rl_res);
sc->rl_bhandle = rman_get_bushandle(sc->rl_res);
msic = 0;
if (pci_find_extcap(dev, PCIY_EXPRESS, &reg) == 0) {
msic = pci_msi_count(dev);
msixc = pci_msix_count(dev);
if (pci_find_extcap(dev, PCIY_EXPRESS, &reg) == 0)
sc->rl_flags |= RL_FLAG_PCIE;
msic = pci_msi_count(dev);
if (bootverbose)
device_printf(dev, "MSI count : %d\n", msic);
if (bootverbose) {
device_printf(dev, "MSI count : %d\n", msic);
device_printf(dev, "MSI-X count : %d\n", msixc);
}
if (msic > 0 && msi_disable == 0) {
if (msix_disable > 0)
msixc = 0;
if (msi_disable > 0)
msic = 0;
/* Prefer MSI-X to MSI. */
if (msixc > 0) {
msixc = 1;
rid = PCIR_BAR(4);
sc->rl_res_pba = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
&rid, RF_ACTIVE);
if (sc->rl_res_pba == NULL) {
device_printf(sc->rl_dev,
"could not allocate MSI-X PBA resource\n");
}
if (sc->rl_res_pba != NULL &&
pci_alloc_msix(dev, &msixc) == 0) {
if (msixc == 1) {
device_printf(dev, "Using %d MSI-X message\n",
msixc);
sc->rl_flags |= RL_FLAG_MSIX;
} else
pci_release_msi(dev);
}
if ((sc->rl_flags & RL_FLAG_MSIX) == 0) {
if (sc->rl_res_pba != NULL)
bus_release_resource(dev, SYS_RES_MEMORY, rid,
sc->rl_res_pba);
sc->rl_res_pba = NULL;
msixc = 0;
}
}
/* Prefer MSI to INTx. */
if (msixc == 0 && msic > 0) {
msic = 1;
if (pci_alloc_msi(dev, &msic) == 0) {
if (msic == RL_MSI_MESSAGES) {
device_printf(dev, "Using %d MSI messages\n",
device_printf(dev, "Using %d MSI message\n",
msic);
sc->rl_flags |= RL_FLAG_MSI;
/* Explicitly set MSI enable bit. */
@ -1249,10 +1284,12 @@ re_attach(device_t dev)
} else
pci_release_msi(dev);
}
if ((sc->rl_flags & RL_FLAG_MSI) == 0)
msic = 0;
}
/* Allocate interrupt */
if ((sc->rl_flags & RL_FLAG_MSI) == 0) {
if ((sc->rl_flags & (RL_FLAG_MSI | RL_FLAG_MSIX)) == 0) {
rid = 0;
sc->rl_irq[0] = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_SHAREABLE | RF_ACTIVE);
@ -1539,7 +1576,7 @@ re_attach(device_t dev)
#endif
/* Hook interrupt last to avoid having to lock softc */
if ((sc->rl_flags & RL_FLAG_MSI) == 0)
if ((sc->rl_flags & (RL_FLAG_MSI | RL_FLAG_MSIX)) == 0)
error = bus_setup_intr(dev, sc->rl_irq[0],
INTR_TYPE_NET | INTR_MPSAFE, re_intr, NULL, sc,
&sc->rl_intrhand[0]);
@ -1631,7 +1668,7 @@ re_detach(device_t dev)
}
if (ifp != NULL)
if_free(ifp);
if ((sc->rl_flags & RL_FLAG_MSI) == 0) {
if ((sc->rl_flags & (RL_FLAG_MSI | RL_FLAG_MSIX)) == 0) {
if (sc->rl_irq[0] != NULL) {
bus_release_resource(dev, SYS_RES_IRQ, 0,
sc->rl_irq[0]);
@ -1647,6 +1684,10 @@ re_detach(device_t dev)
}
pci_release_msi(dev);
}
if (sc->rl_res_pba) {
rid = PCIR_BAR(4);
bus_release_resource(dev, SYS_RES_MEMORY, rid, sc->rl_res_pba);
}
if (sc->rl_res)
bus_release_resource(dev, sc->rl_res_type, sc->rl_res_id,
sc->rl_res);

2
sys/pci/if_rlreg.h
View File

@ -864,6 +864,7 @@ struct rl_softc {
struct resource *rl_res;
int rl_res_id;
int rl_res_type;
struct resource *rl_res_pba;
struct resource *rl_irq[RL_MSI_MESSAGES];
void *rl_intrhand[RL_MSI_MESSAGES];
device_t rl_miibus;
@ -908,6 +909,7 @@ struct rl_softc {
#define RL_FLAG_FASTETHER 0x0100
#define RL_FLAG_CMDSTOP 0x0200
#define RL_FLAG_MACRESET 0x0400
#define RL_FLAG_MSIX 0x0800
#define RL_FLAG_WOLRXENB 0x1000
#define RL_FLAG_MACSLEEP 0x2000
#define RL_FLAG_PCIE 0x4000